CN1032169C - Keyboard device for electronic musical instrument - Google Patents

Abstract

A keyboard device for an electronic musical instrument is mainly composed of a key frame, keys, key switches and an assembly guide. The fixed part of the key is supported by the key frame so that the front of the key can freely rotate up and down. An actuator is added to the lower edge of the key and projects downwardly from the lower edge of the key. The key switch (or key drop sensor) has an elastic protrusion at its upper end. The key switch is placed on the key frame and driven by an actuator which depresses the elastic projection of the key switch when the key is depressed. When the key is moved in the assembling direction (ie, the longitudinal direction of the key), the assembling guide portion guides the key to perform an assembling operation of assembling the key and the key frame. Among them, the key is guided by the assembling guide portion in such a manner that the actuator does not come into contact with the key switch during the assembling operation. That is, the actuator does not come into contact with the key switch during the assembly operation. In this way, the key switches are not damaged at all by the actuator during the keyboard assembly operation.

Description

The present invention relates to a keyboard device for an electronic musical instrument such as an electronic piano.

According to the general structure of a conventional keyboard used in an electronic musical instrument, a plurality of keys, key switches, key stoppers, key guides, etc. are supported by a key frame fixed to the main body of the instrument, and the keys are supported by the key frame each so that it can freely rotate about a predetermined fulcrum. On the key frame, a key switch connected to the key is provided. When each key is pressed, the corresponding key switch is driven, thereby generating a key-on signal.

US Patent No. 5,131,308 and Japanese Utility Model Publication No. 3-108295 disclose a cross-sectional view of the mechanical structure of the keyboard device shown in FIG. 1 . A key guide 11 is provided at the front end portion of the key frame 8, which functions to prevent lateral swing or twist that may occur when a certain key is pressed. The key frame 8 is made of a rectangular metal plate. The top edge portion of the key frame 8 is curved and the curved portion of the frame is covered with a resin film, thereby finally forming the key guide piece 11 . Or the curved portion of the key frame itself is made of resin, and then the curved portion of the key frame that is in contact with the key is covered with a flexible resin so that the key guide piece 11 will eventually become the part of the key frame described above. The key switch 10 is mounted on a circuit board 81 to form a switch circuit device. The switch circuit device is firmly fixed on the key frame 8 by screws 82 . The key switch 10 includes a protruding member made of elastic material such as rubber. When the key is pressed, the detent 6 connected to the lower surface of the key 1 presses the protruding member of the key switch 10 downward to deform the protruding member. In this way, a plurality of internal contacts (not shown) of the key switch 10 are brought into contact with each other, so that the key switch 10 is turned on.

The guide member 4 is formed as a part of the key 1 and protrudes from the lower surface of the key 1 . When the key 1 is pressed, the guide member 4 slides downward under the guidance of the key guide sheet 11 of the key frame 8 . The stop member 5 is formed as part of the guide member 4 . When the key 1 returns from the pressed position, the stopper member 5 comes into contact with the key guide piece 11 , thereby forming an upper limit stopper with respect to the key 1 . Incidentally, member 3 is designated as a black key. The key 1 (ie, the white key) has a raised portion 7 projecting downward from the common base portion 2 . The common base portion is provided at a trailing portion of the key. The protruding portion 7 is fitted into a hole 9 formed in a predetermined rear edge portion of the key frame 8 , and then the key 1 and the key frame 8 are fixed with screws 83 .

When the key 1 and the key frame 8 are assembled together, the raised portion 7 of the key 1 is temporarily mounted on the key frame 8, and then the key 1 is placed horizontally on the key frame 8. direction, so that the guide member 4 cooperates with the key guide piece 11, after which the protrusion 7 is inserted into the hole 9. As mentioned above, due to the shape of the guide member 4 , the key 1 should slide horizontally on the key frame 8 . In other words, the stopper 5 extends horizontally from the guide member 4 in the opposite direction (ie, the left direction in FIG. 1 ). Thus, in order for the guide member 4 having a shape similar to the letter L to cooperate with the key guide sheet 11, the keys should move horizontally in the opposite direction just before the keyboard device is assembled together.

When assembling a conventional keyboard device, some lower surface portions of the keys 1 and drivers 6 move horizontally relative to the key switches 10 protruding from the key frame 8 while contacting each other, and then they are fixed to Together. Due to this fixing method, the key switch 10 sometimes deforms in the horizontal direction. If the key 1 and the key frame 8 are fixed together in this fixed manner, the key switch 10 cannot function well, which makes it impossible to fully perform the functions of the key switch 10 . In order to overcome the aforementioned deformation caused by the force generated in the horizontal direction when the key 1 and the key frame 8 are fixed together, the conventional art provides certain countermeasures, by which the rubber wall of the key switch 10 The thickness of the rubber is increased or the hardness of the rubber used is strengthened, or, for the same purpose, it is necessary to use a stronger force to fix the key switch 10 to the key frame 8 . Another countermeasure is disclosed in US Pat. No. 4,914,999, in which the key is moved vertically down to the key frame, and then the key is inserted for connection to the key frame. To this end, a specially designed valve-like structure for the key frame, key switch and circuit board is provided so that the stopper member 5 can move along the The key guide piece 11 moves down smoothly.

However, if the thickness of the rubber wall of the key switch 10 is increased or the key switch 10 is made of hard rubber as described above, the key drop sensitivity will be reduced. In order to securely connect the key switch and the key frame together, the number of fixing members and the number of steps taken for fixing the key switch and key frame together should be increased. In addition, when fixing the key and the key frame together, the worker should pay special attention not to make the parts of the key touch the key switch. Such a complicated fixing operation requires many man-hours, or requires workers to have high manual skills.

In the aforementioned techniques disclosed in the above-mentioned US patents, the structures of the key unit and the key frame unit are complicated, and complicated processing is required when forming a key frame. In addition, when the key and the key frame are fastened together, the detent element passes through a valve-like portion. This operation is required for each of all keys. Thus, the technique disclosed suffers from its complexity.

Therefore, a main object of the present invention is to provide a keyboard device for an electronic musical instrument, in which, when the keys and the key frame are assembled together, by applying a external force, so that the key switch can avoid deformation.

According to the basic structure of the keyboard device specified by the present invention, it includes a key, a key frame, a key drop sensor, a driver and a key guide piece. The fixed part of the key is supported by the key frame so that the front part of the key can freely rotate upwards and downwards. The actuator is attached to the lower surface of the key, and the key drop sensor is attached to the key frame. When the key is pressed down, the driver drives the key down sensor to sense a key down condition. The key down sensor can be designed as a key switch with a raised portion made of elastic material. Thus, when the key is depressed, the actuator will depress and partially deform the raised portion of the key switch, thereby turning the key on.

When the key and the key frame are assembled together, the key is guided by the guide piece so that when the key moves along the length of the key, the driver does not directly contact the key. contact with the key switch. Thus, it is possible to avoid applying the external force to the key switch during the assembling work of assembling the key and the key frame together.

Other objects and advantages of the invention will become apparent from the following description with reference to the accompanying drawings in which preferred embodiments of the invention are included. in,

Fig. 1 is an assembly drawing, and it has shown the assembly operation that implements between key unit and key frame unit in the conventional keyboard device;

Fig. 2 is an assembly drawing, and it has shown according to the assembly operation to be implemented between the key unit and the key frame unit in the keyboard device of the first embodiment of the present invention;

Fig. 3 (A) is a side perspective view, and it has shown the detailed structure of a key guide piece;

Figure 3(B) shows the shape of a brake element;

Fig. 4 (A) has shown another example of described key guide piece;

Fig. 4 (B) has shown another example of described brake element;

Fig. 5 (A) is a side perspective view, it has shown the detailed structure of a device guiding element;

Figure 5(B) shows another example of the device guide element;

6(A)-6(D) show the steps of the assembly process for assembling the keyboard device according to the first embodiment of the present invention;

7(A)-7(B) show another example of the steps used to assemble the keyboard device;

Fig. 8 shows the sectional view of another example of the keyboard device;

9(A)-9(C) show the assembly process steps for another keyboard structure example shown in FIG. 8;

10(A)-10(B) illustrate another example of the assembly process steps for another example of the keyboard device;

Fig. 11 shows the sectional view of still another example of the keyboard device;

12(A)-12(B) show different examples of the vertical direction assembly guide member used in the keyboard device shown in FIG. 11;

Figure 13 shows an example of use of a boss with a conical assembly guide member;

Figure 14 shows another usage example of the boss with a conical assembly guide member;

Figure 15 shows a plan view of a guide groove and a hole shape formed in the key frame;

Fig. 16 (A) has shown the insertion mode that a boss is inserted into a hole on the described key frame;

Fig. 16(B) shows another example of the shape of the guide groove and the hole formed in the key frame;

17(A)-17(F) show the steps of the assembly process for assembling the keyboard device shown in FIG. 11;

18(A)-18(F) show another example of the steps of the assembly process for assembling the keyboard device shown in FIG. 11;

Figure 19 is an exploded perspective view showing the assembly operation of assembling two key components together;

FIG. 20 is a plan view showing a main part of a key frame used in a keyboard device according to a second embodiment of the present invention;

Fig. 21 is a side view showing the assembled state of the keyboard device.

Fig. 22 is a side perspective view, it has shown described key device and key frame that are not assembled together;

Figure 23 is a side perspective view showing an example of the rear edge portion of the key device;

Figure 24 is a sectional view of the key device shown in Figure 23;

25(A)-25(C) are several side views showing an example of the assembly process of assembling the key device and the key frame together;

26(A)-26(D) are side views showing yet another example of the assembly process;

Fig. 27 is a side perspective view showing still another example of the key device;

Figure 28 is a side perspective view showing yet another example of the key device;

The side perspective view of Fig. 29 shows an example corresponding to the described key frame of key device shown in Fig. 28;

Figure 30 is a side perspective view showing yet another example of the key arrangement and the key frame not assembled together;

31(A)-31(C) are side views showing an example of assembly steps for assembling the key device and key frame shown in FIG. 30;

The side view of Figure 32 shows still another example of said keyboard device;

Fig. 33 is an exploded view, which particularly shows a plurality of rear edge portions of said key unit assembled together;

Fig. 34 is a side view, it has shown the example that is used for the fixed plate of keyboard device shown in Fig. 30;

Figure 35 is an exploded view showing three key units assembled together according to a third embodiment of the present invention;

Fig. 36 is a partial view showing a main part of a keyboard device according to a fourth embodiment of the present invention;

FIG. 37 is a side view showing a main part of the keyboard device according to a modification of the fourth embodiment of the present invention;

FIG. 38 is a side view showing a main part of the keyboard device according to another modification of the fourth embodiment of the present invention;

Fig. 39 is a partial view showing a switch device used as said key switch associated with said keyboard device according to a fifth embodiment of the present invention;

Fig. 40 is a side perspective view showing an example of the switching device in which a plurality of elastic protrusion members are continuously arranged at a predetermined pitch;

Figure 41 is a partial view showing another switch device made into a two-way contact type touch response switch;

Fig. 42 is a partial view showing an example of the keyboard device in which the switch device is used as the key switch;

Fig. 43 is a partial view showing another example of the switching device;

Fig. 44 is a partial view showing still another example of the switching device;

Figure 45 is a side view showing a keyboard device according to a sixth embodiment of the present invention; and

Fig. 46 is a side perspective view showing the main part of the keyboard device according to the sixth embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, in which like parts will be assigned like reference numerals.

[A] First Embodiment

Fig. 2 is an assembled view showing a sectional view of the key unit assembled together and another sectional view of the key frame unit. All the keys used in this keyboard device are classified into three groups, and three blocks are respectively provided for the three groups of keys, the first block corresponds to a plurality of black keys arranged side by side on said keyboard, wherein , with 5 black keys providing an octave. The second block corresponds to a group of white keys, wherein every other white key corresponds to a white key to be selected from a row of white keys. The third block corresponds to an additional set of white keys not selected for use in the second block, the three blocks being assembled together by combining the three common base portions 2a, 2b and 2c Together. The white key 1 is provided with a protrusion 7 projecting downward from the lower surface of said common base portion 2c. This common base portion 2c is provided at the rear edge portion of said key 1 . The protrusion 7 is inserted into a hole 9 of the key frame 8 . In this way, the key unit and the key frame unit are assembled together. A key guide piece 11 is provided at the front edge portion of the key frame 8 to prevent the key 1 from laterally swinging or rotating when it is pressed down. When forming the key guide sheet 11, the top edge portion of the key frame 8 made of a rectangular metal plate is bent, and then, the bent portion is covered with a layer of resin film material, or the bent portion has a curved shape. The key frame 8 itself is made of the resin material, and then only the key contact portion thereof is covered with a flexible resin material, thereby forming the key guide piece 11. On the key frame 8, the key switch 10 is provided for each of a plurality of keys. As mentioned above, the key switch 10 includes a protrusion made of elastic material such as rubber. This raised portion is deformed by the squeeze of the driver 6 when the key is pressed. Here, a movable contact is attached at the inner wall of the convex portion, and a stationary contact is provided at a position opposite to the movable contact in the key switch 10 . Thus, when the key is pressed, the movable contact makes contact with the stationary contact, thereby transmitting a key-on state. Therefore, on the printed circuit groove connected to the lower surface of the key frame 8, the above-mentioned raised portion is installed. Accordingly, the top edge portion of the raised portion protrudes upward from the through hole provided in the key frame 8 .

A guide member 4 is provided as part of said key 1 . The guide member 4 can slide up and down when guided by the key guide piece 11 of the key frame 8 . A stopper member 5 serving as an upper limit stopper of the key 1 serves as a lower edge portion of the guide member 4 . When the pressed key returns to its original position, the stopper member 5 comes into contact with the key guide piece 11 .

Incidentally, label 3 designates a black key.

An example of the detailed structure of the key guide sheet 11 is shown in FIG. 3(A). The key guide is mainly composed of a guide member 14 and a braking element 15 . Both side portions of the guide member 14 form a plurality of guide surfaces, guided by these guide surfaces, the key can move up and down. The detent member 15 can be made as a large frame for multiple keys arranged side by side. In addition, the key guide piece 11 can be formed separately from the key frame 8 . In this case, after the key guide piece 11 is manufactured, the key frame top edge portion is inserted into the groove 15a formed in the stop member 15 along its length. A key guide piece 11 is attached to the key frame. A slope 16 is formed at the two lower edge portions of the guide member 14. With this slope, the guide member 4 can be smoothly guided by the guide member 14, or the guide member 4 can be guided smoothly by the guide member 14. The guide member 4 can be smoothly assembled with the key guide piece 11.

The guide member 14 of the key guide sheet 11 is sandwiched by the guide member 4 of the key 1 . A taper 13 as shown in FIG. 3(B) is formed at the top edge portion of the brake member 5 formed as the lower edge portion of the guide member 4 . The taper 13 helps the brake element 5 to connect smoothly with the guide member 14 . When the key unit and the key frame unit are assembled together, the stop member 5 is pressed toward the guide member 14 .

Another example of the key guide sheet 11 is shown in FIG. 4(A). In this example, a taper 17 is formed along a lower edge portion of said stop member 15 . As shown in FIG. 4(B), the detent element 5 of the guide member 4 is not provided with a taper 13 (see FIG. 3(B)). However, by providing said braking element 5 with said taper 13, said assembly operation can be made smoother. In other words, by attaching said taper 17 to said brake element 15, said assembly operation, in which said brake element 15 is pressed into said brake element 15, can be smoothly carried out. Moving member 15.

During this time, an assembly guide member 12 is formed and will extend from a rib of the driver 6 projecting downward from the inner wall of the key 1 as shown in FIG. 5(A). 5(A) and 5(B) are two side perspective views each showing the detailed constitution of the device guide member 12 . Incidentally, each of these two figures shows the main part of the inside of the key 1 in the reversed representation. FIG. 5(A) shows an example in which the driver 6 is provided with one transverse rib, and FIG. 5(B) shows another example in which the driver 6 is provided with two ribs. In each of these two examples, the device guiding element 12 extends lengthwise from the rib. The assembling guide member 12 is arranged at a position where, when the key unit and the key frame unit are assembled together, the assembling guide member 12 and the The upper edge portion of the key guide piece 11 of the key frame 8 is in contact. Such an assembly guide member 12 does not have a function that the driver can press the key switch 10 . In short, this assembly guide member 12 only has the role of guiding the members when performing the assembly operation.

6(A)-6(D) illustrate the corresponding steps associated with the assembly process of the keyboard device. First, as shown in FIG. 6(A), the protrusion 7 of the key 1 is installed near the hole on the key frame 8 (see the dotted line). At this time, the detent element 5 of the guide member 4 is placed above the detent member 15 of the key guide piece 11 .

Next, as shown in FIG. 6(B), the key 1 is pressed down by turning around the protrusion 7, which is used as a fulcrum. At this time, the top edge portion of the brake element 5 will produce a slight forward (ie, the right side of the drawing) compared with the previous position of the brake element 5 shown in Figure 6 (A). move. Subsequently, the top edge portion of the detent element 5 will slide down along the front surface of the detent member 15 of the key guide piece 11 .

By further pressing down the key 1, the upper surface of the brake member 5 finally reaches a surface having the lower surface of the brake member 15 as shown in FIG. 6(C). At this time, the lower surface of the assembly guide member 12 is in contact with the highest portion of the guide member 14 of the key guide piece 11 . In addition, the driver 6 is disposed above and away from the upper surface of the key switch 10 . Therefore, in this state, the driver 6 is not in contact with the key switch 10 at all.

In the state where the assembly guide member 12 is in contact with the highest part of the guide element 14 of the key guide sheet 11, the key 1 can move slightly backward (ie, the left direction in the drawing). Therefore, as shown in FIG. 6(D), the protrusion 7 is finally inserted into the hole of the key frame 8 . In this way, the assembly work is completed. At this time, the braking element 5 of the guide member 4 is placed at a position in contact with the lower surface of the braking member 15, which position is defined as an upper limit, when the key 1 is moved from the When the pressed position is returned, its upward movement to this upper limit position is restricted. Both said braking member 15 and said braking element 5 together constitute an upper limit stop for said key 1 . In the state where the assembly guide member 12 is placed above the guide member 14 away from the key guide sheet 11, the assembly guide member 12 and the key 1 are pressed downward. The downward movement of each does not interfere with each other. When the key 1 is pressed down, the driver presses and deforms the key switch 10 , thereby driving the key switch 10 .

7(A)-7(B) illustrate another assembly process for the keyboard device. The protrusion 7 of the key 1 is installed on the key frame 8 at a position of distance L from the position of the hole (shown by the dotted line) as shown in FIG. 7(A). In this state, the key 1 moves backwards (ie, the left direction in the drawing), and its lower surface will slide to come into contact with the highest part of the guide member 14 . In the case that the highest part of the guide member 14 reaches the root of the rib of the driver extending along the length direction of the key 1 as shown in FIG. The distance L between becomes equal to the distance between the braking element 5 of the guide member 4 and the braking member 15 which will be in contact with the braking element 5 . In short, after the guide member 14 and the rib of the driver 6 come into contact with each other, the key 1 moves a distance L in the horizontal direction while sliding on the key frame 8 .

According to the state shown in FIG. 7(A), the key 1 is further moved to the left direction, and the highest part of the guide member 14 slides along the rib of the driver 6 . Like this, described key 1 also will move to the left while outward. Subsequently, the highest part of the guide member 14 reaches the highest part of the rib. in addition. As shown in FIG. 7(B), the highest portion of the guide member 14 eventually reaches the position of the device guide element 12 .

If the key 1 continues to move to the left, the previous state shown in Figure 6(C) will be obtained, and then, as shown in Figure 6(D), the key 1 is finally fixed with the key frame 8 together.

When the assembly process shown in FIGS. 7(A) and 7(B) is performed, the key 1 will move in the horizontal direction, and the guide member 14 will slide along the rib of the driver 6 . For this reason, the ribs extending in the lengthwise direction are not formed at a sharply rising angle. In other words, the ribs must be formed at progressively inclined angles.

Fig. 8 shows another example of the mechanical structure of the keyboard device. Unlike the previous examples, this keyboard device is designed to utilize a device guide rib 18 disposed apart from the driver 6 in place of the aforementioned assembly guide member 12 .

9(A)-9(C) show the assembly process of this keyboard device. First, as shown in FIG. 9(A), the protrusion 7 of the key 1 is installed at a certain position near the hole (see dotted line) of the key frame 8 . The detent element 5 of the guide member 4 is placed above the detent member 15 away from the key guide piece 11 .

Then, as shown in FIG. 9(B), the key 1 is raised by turning around the protrusion 7 . At this time, the top edge portion of the braking member 5 slightly moves forward (ie, the right side of the drawing) compared to the state shown in FIG. 9(A). Accordingly, the top edge portion of the brake member 5 slides and rotates along the front surface of the brake member 15 of the key guide piece 11 .

By moving the key 1 further downward, the upper surface of the braking member 5 reaches the lower surface of the braking member 15 to come into contact with it as shown in FIG. 9(C). At this time, the device guide rib 18 will be in contact with the highest portion of the guide member 14 of the key guide piece 11 . In addition, the driver 6 is disposed above and away from the upper surface of the key switch 10 . In this state, the driver 6 is not in contact with the key switch 10 at all.

With the device guide rib 18 in contact with the highest portion of the guide member 14 of the key guide piece 11, the key 1 moves backward (left direction in the drawing). Subsequently, as shown in FIG. 8 , the protrusion 7 is inserted into the hole of the key frame 8 , thereby completing the assembly process. At this time, the brake element 5 of the guide member 4 is not in contact with the lower surface of the brake member 15 . The point of contact between them forms the upper limit of the key 1 when the key 1 returns from the depressed position. In other words, said detent member 15 together with said detent element 5 forms an upper detent for said key 1 . In this state, the device guide rib 18 is separated from the guide member 14 of the key guide sheet 11 , so that the device guide rib 18 does not interfere with the key pressing movement of the key 1 . In this way, when the key 1 is depressed, the driver 6 presses and deforms the key switch 10 , thereby driving the key switch 10 .

10(A) and 10(B) illustrate the assembly process for the keyboard device shown in FIG. 8 . As shown in FIG. 10(A), the protrusion 7 is arranged at a position on the key frame 8 away from the hole position (indicated by the dotted line). In this state, the guide member 14 of the key guide piece 11 is in contact with the lower surface of the key 1 . Subsequently, the key 1 is moved backward while the lower surface of the key 1 slides along the uppermost part of the guide member 14 . In the case where the guide member 14 reaches the root of the long rib portion of the device guide rib 18 as shown in FIG. 10(A), the driver 6 does not reach the key switch 10, so that the driver 6 and the The key switches 10 are separated from each other.

Thereafter, the key 1 continues to move to the left, while the outermost part of the guide member 14 slides along the device guide rib 18 . Therefore, as shown in FIG. 10(B), the key 1 moves in the left direction while being raised.

By continuing to move the key 1 to the left, the highest part of the guide member 14 reaches the highest part of the device guide rib 18 . Thus, the former assembled state as shown in Fig. 9(C) can be obtained. Thereafter, the key 1 is moved as described above, so that the key 1 is finally assembled with the key frame 8 as shown in FIG. 8 .

When the assembly process shown in FIGS. 10(A) and 10(B) is performed, the key 1 moves in the horizontal direction, and the guide member 14 slides along the device guide rib 18 . For this reason, the long rib portion of the device guide rib 18 is not formed at a sharply rising angle, in short, this long rib portion must be formed at a gradually inclined angle.

In the foregoing examples, a keyboard device is designed such that its guide member 14 is in contact with the assembly guide member 12 or the assembly guide rib 18 . However, it is possible to modify these examples so that the position of the guide member 14 is shifted in directions other than the lengthwise direction of the key 1 . In this case, raised elements specifically designed to come into contact with the set of device guide members 12 or assembly guide bars 18 may be provided at the positions where the guide members 14 were previously provided.

Fig. 11 shows yet another example of the keyboard device. As previously mentioned, a black key block 21 and two white key blocks 22, 23 are gathered together to form a key device, wherein said black key block is equivalent to a plurality of black keys, and said white key block Equivalent to multiple white keys. The key blocks are grouped together so that all of the keys can be arranged side by side on the keyboard. Fig. 11 only shows one white key 1 and one black key 3, however, the actual situation is that multiple white keys and multiple black keys are arranged side by side on the keyboard.

In order to avoid a gap between the driver 6 (connected to the key 1) and the key switch 10 (provided on the key frame 8) when the key unit and the key frame unit are combined together The contact of the assembly guide member 12 is provided in the manner described in the previous example, and this example also provides a reinforcing rib 20 extending laterally. At the top edge portion of the key frame 8, a The key pressing guide member 14 (ie, the guide member 14), when the key 1 is pressed, the guide member 14 guides the key 1 in the vertical direction (ie, the direction in which the key is pressed). In addition, for the key 1 provides an upper limit brake (ie brake element) 5.

In the present example, a hollow cylindrical thread sleeve 24 protrudes downward from the common base portion of the white key block 23 disposed at the lowest position of the aforementioned key device. The thread sleeve 24 may correspond to the aforementioned protrusion 7 . A vertical assembly guide member 25 is formed by utilizing the wire sleeve 24 along the long axis direction of the wire sleeve. The assembly guide member 25 has a skirt-like (or taper-like) shape such that its base is relatively small and its edge portion is relatively wide. The purpose of providing the assembly guide member 25 is to avoid an event in which, when the key blocks 21, 22 and 23 (i.e. key means) are connected to the key frame 8, the The driver 6 is roughly moved vertically downward from the above-mentioned key switch 10 position above, thereby enabling an external force to be applied to the key switch 10 in the horizontal direction.

As mentioned earlier, when the key unit and the key frame unit are assembled together, the chain 1 moves in both horizontal and vertical directions, and then the key 1 moves around the fulcrum (ie, at the The protrusion 7) provided on the top edge of the key 1) is rotated, and finally the protrusion 7 is inserted into the hole 9 of the key frame 8 (see FIG. 2), thereby completing the assembly operation (see Figures 6(A)-10(B)). The above-described complex assembly movement of the key 1 is necessary for partially bending the upper limit stopper 5 and then placing it under the key frame 8 . In other words, it is not possible to simply move the key 1 such that the protrusion 7 moves vertically to fit into the hole 9 of the key frame 8 . The driver 6 connected to the key 1 is located just above the key switch 10 just before the protrusion 7 is inserted into the hole 9 of the key frame 8 . Before reaching this state, the driver 6 avoids contact with the key switch 10 due to the assembly guide element 12 or the assembly guide rib 18 acting in the horizontal direction. Thus, it is possible to prevent the external force from acting laterally on the key switch 10 when the assembling operation is performed. As a result, it is possible to improve the reliability of the function of the key switch 10 after the key unit is completely assembled with the key frame unit.

Meanwhile, when the protrusion 7 is inserted into the hole 9 of the key frame 8, the upper limit stopper 5 is placed in the key depression guide provided for the key frame 8. Under the condition of the member 14, the key 1 rotates around the upper limit detent 5. At this time, the protrusion 7 moves downward while its side surface slides to come into contact with the edge portion of the hole 9 . According to the embedding process of the protrusion 7 into the hole 9, the protrusion 7 moves to approach the hole 9, so that the key 1 moves laterally (or horizontally). Due to this movement of the key 1, the driver 6 eventually applies an external force slightly to the key switch 10 in the horizontal direction.

The present example is provided to avoid the above-mentioned phenomenon that when the protrusion 7 is finally inserted into the hole 9 on the key frame 8, the driver 6 will move from the above-mentioned position of the key switch 10 A roughly vertical downward movement causes the external force to be applied laterally to the key switch 10 . Therefore, this example can improve the reliability of the performance of the key switch 10 .

In particular, the wire sleeve 24 connected with the key block 23 provides a vertical assembly guide member 25 with a similar tapered shape, and the tapered edge portion of the assembly guide member 25 is formed along the key While one edge portion 30a of the hole 30 at a certain position of the frame 8 slides, the wire sleeve 24 descends. In the case where the tapered portion 13 of the upper limit stopper 5 is placed under the key depression guide 14 of the key frame 8 , when the key block 23 rotates around the center of rotation corresponding to the upper limit stopper 5 When turning, the structure of the assembly guide member 25 having a tapered shape works so that the same distance is maintained between the center of rotation and the tapered edge portion of the assembly guide member 25 . Therefore, the cone-like root portion is designed smaller. In other words, the tapered edge portion of the assembling guide member 25 constitutes a part of an annular slider when the key block 23 is rotated about the rotation center. By moving along the tapered edge portion, the wire sleeve 24 is inserted into the hole 30 of the key frame 8 . Since the same distance is maintained between the center of rotation and the tapered edge portion of the assembly guide member 25 when the key piece is rotated around the center of rotation, even if coordinated with the rotation The insertion of the wire sleeve into the hole 30 does not cause any force nor is any force applied to the key piece 23 so that the key piece 23 does not move towards the hole 30 . Therefore, the driver 6 connected to the key 1 will move down roughly vertically from the position above the key switch 10 provided on the key frame 8, but during the downward movement of the driver 6, there will be no Any force acts laterally on the key switch 10 .

12(A) and 12(B) are two side perspective views each showing the shape of the assembly guide member 25 . In these figures, the wire sleeve 24 is shown inverted compared to that shown in FIG. 11 . FIG. 12(A) shows an assembly guide member 25 composed of a rib-shaped thin plate member. A lower edge portion 25a protrudes from the plane of the edge portion of the sleeve 24 so as to guide the sleeve 24 horizontally toward the hole 30 before inserting the sleeve 24 into the hole 30 . The lower edge portion 25a will slide into a hole 29 (the hole will be described later in connection with Figures 15 and 16). In addition, an auxiliary member 25b works to widen the tapered guide surface to ensure the guide operation for the sleeve 24 and to perform the horizontal guide operation smoothly (the operation will be described later). This auxiliary element 25b may extend along the entire length of said tapered rim portion.

FIG. 12(B) shows another example of the assembly guide member 25, which is roughly shaped like an ellipse, and in this member, the top edge portion is configured to be larger than its root part. The main function of this assembly guide member 25 shown in FIG. 12(B) is the same as that of the assembly guide member 25 shown in FIG. 12(A).

FIG. 13 shows an example of use of the wire sleeve 24 having the guide member 25 assembled as described above. According to this example, the wire sleeve 24 is used as a fixing member for fixing the key to a lower case 26 constituting a part of the main body of the electronic musical instrument. Here, the wire sleeve 24 has a hollow shape and provides a cylindrical threaded hole. Quick-tapping screws 27 pass through the lower case 26 and are inserted into the threaded holes of the thread sleeve 24 , so that the key frame 8 is fixed on the lower case 26 .

FIG. 14 shows another usage example of the wire sleeve with the assembly guide member 25 . In this example, the printed circuit board 28 on which the electronic circuit for controlling the electronic sounding of the electronic musical instrument is mounted is fixed under the key frame 8, and the key frame is fixed by the printed circuit board 28. 8 and the lower case 26 are fixed together, and the quick-tapping screws 27 are inserted into the wire sleeve 24 through the printed circuit board 28, so that the key frames 8 of the lower case 26 are fixed together, By the way, this example can be modified so that the printed circuit board 28 is connected to the wire sleeve 24 only by screws.

FIG. 15 shows the shape of the hole 30 formed in the key frame 8 and through which the assembly guide member 25 can be inserted. A guide slot 29 is provided in the hole 30 for allowing the wire sleeve 24 connected to the key block to slide horizontally on the key frame 8 when the key block and the key frame 8 are assembled together. , and direct it to the hole 30. The guide groove 29 can be changed into a through hole, similar to the hole 30 penetrating through the key frame 8 . Or the guide groove 29 can be formed as a concave part formed on the key frame by stamping or other means.

The aforementioned lower edge portion 25 a of the assembly guide member 25 is inserted into and fitted into the guide groove 29 . According to the progress of the assembly operation, the assembly guide member 25 is guided from the guide groove 29 so that the wire sleeve 24 is finally guided to the hole 30 . In the guide groove 29, the first edge width _D1 is set larger than the second edge width _D2 . Due to the tapered shape of the guide groove 29, even if the lower edge portion 25a of the assembly guide member 25 is roughly inserted into the guide groove 29 at first, the travel path becomes narrow so that It is also possible to accurately insert the wire sleeve 24 into the hole 30 . In short, it is possible to simplify the insertion operation of the wire sheath 24 . By the way, the width D ₃ of the hole 30 matches the outer diameter of the wire sleeve 24 .

16(A) and 16(B) show a modified example of the hole 30 formed through the key frame 8 . As shown in FIG. 16(B), a locking hole 32 is formed by using said hole 30, and these holes intersect each other at right angles. In short, the shape of these holes is similar to the shape of the letter "L". As shown in FIG. 16(A), a claw 31 is formed by using the black key block 21 (the black key block 21 is placed at the highest position among the key blocks 21, 22 and 23). The claw 31 is elastically embedded in the locking hole 32 and is hooked in the locking hole 32 , so that the key block is firmly fixed with the key frame 8 .

17(A)-17(F) illustrate the steps of the assembly operation. With this step, the white key block 23 provided with the aforementioned assembly guide member 25 is attached to the key frame 8 . When the keyboard device is actually assembled, the aforementioned key device including three key blocks is simultaneously attached to the key frame. However, since the assembling operation related to the key device is the same as the assembling operation related to the white key block 23, only the assembling operation related to the white key block 23 will be described in detail for convenience. In these figures, dashed lines indicate the edge portions of the hole 30 of the key frame 8 through which the wire sleeve 24 can be inserted. First, as shown in FIG. 17(A), the wire sleeve 24 is mounted on the key frame 8 . According to this state, the rear edge portion of the assembly guide member 25 slides along the guide groove 29 (see FIG. 15 ), so that the wire sleeve 24 faces to the right as shown in FIG. 17(B). Slide towards hole 30. FIG. 17(C) shows a state in which the rear edge portion of the assembling guide member 25 has reached the edge position of the hole 30 (delineated by a dotted line). In this state, the driver 6 connected to the key block 23 is placed just above the key switch 10 . As mentioned above, before the driver 6 reaches this position, under the action of the assembly guide member 12 formed continuously in the horizontal direction by the driver 6, the driver 6 is forced to be unable to switch with the key. 10 phase contacts.

In the state shown in FIG. 17(C), the key block 23 rotates around the center of rotation, which is placed near the upper limit brake 5, and the upper limit brake 5 is placed on the key connected to the key. Said keys of the frame 8 are depressed under the guides 14 . Due to the rotation of the key block 23 , the wire sleeve 24 with the assembly guide member 25 is lowered into the hole 30 of the key frame 8 . FIG. 17(D) shows a state in which the lower edge portion 25a of the assembly guide member 25 is lowered slightly into the hole of the key frame 8, so that the driver 6 Move down from directly above the key switch 10 , and then make the driver 6 contact the key head portion of the key switch 10 . At this time, the key depressing guide 14 also slides along the edge portion of the assembly guide member 12 , and then is partially embedded in the inside of the key 1 . In this state, a protrusion 61 of the driver 6 is engaged with the head portion of the key switch 10 , thereby establishing a good fixed relationship between the driver 6 and the key switch 10 . Therefore, even if shock or vibration inevitably occurs when the key 1 is moved down, it is impossible to change this relationship. Due to this relationship, a balanced state can be automatically established for the key as a whole, whereby the position of the key switch 10 is used as a center of balance. FIG. 17(E) shows a state in which the key 1 descends while the outer edge portion of the assembly guide member 25 slides along the edge portion of the hole. In this state, the driver 6 roughly descends in the vertical direction while pressing the key head portion of the key switch 10 made of elastic material. FIG. 17(F) shows a state in which the wire sheath 24 is completely inserted into the hole 30 . In this state, even the root of the assembly guide member 25 can be fitted into the hole of the key frame 8 . During the process of inserting the wire sleeve 24 into the hole, the driver 6 always moves downward in a direction perpendicular to the key switch 10 (or switch driving direction). Therefore, no force acts on the key switch 10 in the horizontal direction. In other words, the key switch 10 made of elastic material will not be squeezed and deformed in the lateral direction.

18(A)-18(F) show another example of the assembling operation step by which the key 23 providing the aforementioned thread sleeve 24 having the tapered assembling guide member 25 is Connected to the key frame 8. Unlike the previous example shown in FIGS. 17(A)-17(F), the assembly guide member 12 continuously formed by the driver 6 is replaced by the assembly guide rib 18 independent of the driver 6 . The functions and working methods of the assembling guide ribs 18 have been described in conjunction with FIGS. 8-10(B). In the first state shown in FIG. 18(A), the upper edge portion of the key depressing guide 14 is directly in contact with the lower surface of the key 1 . Like this, the inclination of described key block 23 must be greater than the inclination of the preceding example described in Fig. 17 (A). However, compared with the previous example shown in FIGS. 17(A)-17(F), the assembly guide member 25 performs substantially the same function in this example. According to the state shown in FIG. 18(A), the thread sleeve 24 is slid and guided to the hole of the key frame 8 (see FIGS. 18(B) and 18(C)). When the trailing edge portion of the assembly guide member 25 reaches the edge portion of the hole (see FIG. 18(D)), the wire sleeve 24 descends, while the outer edge portion of the assembly guide member 25 moves along the hole. The edge of the hole slides (see Figure 18(E)). Finally, as shown in FIG. 18(F), the inserting process of the wire sheath 24 is completed. As mentioned above, the structure of the thread sleeve 24 with the tapered assembly guide member 25 can be used in conjunction with the assembly guide rib 18 so that it can be extended in the horizontal direction, and the rib 18 is connected to the inner wall of the white key 1 and configured separately from the driver 6 .

Fig. 19 is an exploded side perspective view showing the main part of the key unit. The figure shows a bottom view in relation to two white key blocks 22 and 23 . A plurality of white keys 34 are formed with each of the white key blocks 22 and 23 . Each of these white keys 34 is capable of turning around the root of the key which is made of said elastic material. The figure shows three white keys 34, wherein the key block 23 provides an E key and the key block 22 provides an F key and a D key. A plurality of raised portions 33 are formed on the key block 34 . The key block 22 provides a plurality of concave portions 37, each of which corresponds to each of the convex portions 33, by means of which the convex portions 33 and the concave portions 37 cooperate with each other respectively, so that all While the key 34 is arranged side by side, the key blocks 22 and 23 can be stacked together, and the reference numeral 35 designates a positioning hole that cooperates with the positioning protrusion 36 . A plurality of ribs 38 protrude from inner side walls of the concave portion 37, respectively. These ribs 38 are formed as part of the key block 22 made of the elastic material. Due to the use of the rib 38 made of the elastic material, when the key blocks 22 and 23 are assembled using the interfitting of the concave portion 37 and the convex portion 33, the key block 22 and 23 can be firmly fixed together. In FIG. 19 , the black key block 21 (not shown) is placed under the white key block 22 . Since the common base portion of this black key block 21 provided with a plurality of black keys is similar to the common base portion of the white key block 22 or 23 provided with a plurality of white keys, with respect to the black key block 21 Instructions are omitted. Of course, a plurality of ribs 38 are also provided in the black key block. It is possible to provide a plurality of ribs 38 outside the convex portion 33 without providing the ribs 38 inside the concave portion 37 .

[B] Second Embodiment

Fig. 20 is a plan view showing a key support member for the keyboard device according to a second embodiment of the present invention. On a key frame (ie key support member) 112 made of metal material, a flexible panel 113 made of resin material (such as polyester film, etc.) is installed, and one edge of the flexible panel 113 is directed toward Fold back toward the lower side of the key frame 112, and then connect the folded portion to the main panel 135 using a connector 1132 placed at one edge portion of the folded portion 1131 (see FIG. 21 ). On the flexible panel 113, elastically deformable key depressing sensors (ie, key switches) are connected by means of a rubber strip 114 having a connection relationship with each of these keys. The key switch contains two movable contacts in its protruding part, and at the same time, two static contacts respectively corresponding to the two movable contacts are arranged in a concentrated manner on the flexible panel 113 . When pressed by the driver 132 (to be described later), the two switching elements of the key switch 115 are successively turned on for a certain time interval, so that the key switch 115 can generate touch response information. The above-mentioned structure of the movable contact of the key switch 115 can be used for a stroke sensor. For example, eliminating the raised portion containing the movable contact, utilizing a mirror to form the upper surface of the key switch, and then fixing a light reflective type photosensor to the flexible panel 113 for each of the keys The position where the words face the mirror. In this way, the key switch can be redesigned as a stroke sensor capable of transmitting the key depression stroke. As key depression sensors, embodiments of the present invention may use travel sensors or a front/rear touch sensor instead of the key switches described. In short, the key depression sensor is not limited to the key switch. However, for the sake of convenience, the present embodiment still adopts the key switch as the key depression sensor.

Together with the side edge portion of the key frame 112 (i.e., the right side portion in FIG. 20 ), a plurality of key guides 116 are also arranged, each of which can, when the key is pressed down, Avoid lateral swinging and turning of the keys. Reference numeral 117 designates a fixing hole by which the key frame 112 can be fixed to each side portion of an upper case (not shown) constituting a part of the main body of the keyboard instrument.

The rear edge portion (ie, the left side portion in FIG. 20 ) of the key frame 112 is bent upward to form an upright portion 118 . At a predetermined position of said standing portion 118, a claw hole 119 is formed, by means of which claw hole 119, said key device can be firmly fixed. A predetermined number of fixing holes 120 for firmly fixing the aforementioned lower case are formed at corresponding positions of the key frame 112 . The number of the fixing holes 120 is determined such that one or two holes are provided for a plurality of keys corresponding to sound tones within an octave range. For example, the wire sleeve 126 is inserted through the fixing hole 120 , and the screw 1201 is screwed into the wire sleeve 126 from the lower side of the wire sleeve 126 . In this way, the key frame 112 and the lower case are firmly screwed together.

A predetermined portion of the rear edge portion of the key frame 112 is partially cut and folded upward to form a guide portion 123 . Reference numeral 122 denotes an opening which is cut. On the key frame 112, the guide portion 123 is bent vertically upward. The upper edge portion of the guide portion 123 is further bent horizontally, thereby forming a support member 145 to support the upper case. In addition, fixing holes 124 are formed through the supporting member 145 to firmly support the upper case. Incidentally, reference numeral 125 denotes a positioning hole used when assembling the key unit.

Fig. 21 shows a partial view of the keyboard device. In this keyboard device, the keys are connected to the keyboard frame 112, and the key devices are fixed to the upper and lower shells. Below the central portion of the key frame 112, there is provided a main panel 135 which is fixed to the key frame 112 by means of a bushing 134. As shown in FIG. The flexible panel 113 is folded backward toward the lower side of the key frame 112 , and then the folded portion of the flexible panel 113 is connected to the main panel 135 . The main panel 135 is a circuit board with various electronic circuits such as microcomputer, memory and sound source circuit. These circuits are used to perform operations such as key depression-specified operations and musical tone control.

The key assembly 129 is connected to the key frame 112 and mainly consists of three key blocks 1281 , 1282 and 1271 which are stacked on top of each other and assembled together at the common base portion. FIG. 21 shows two white keys 128 , 128 a and one black key 127 .

Each of the white keys 128 is provided with an actuator 132 which depresses the key switch 115 when the key is depressed. As part of the key front portion, slide guide elements 146 are formed and arranged such that the key guide 116 is sandwiched therein. The lower edge portion of the slide guide member 146 is bent to form a detent member 147 that contacts the lower edge surface of the key guide 116, so that the key returns from the key depressing position. The return movement stops. Furthermore, a rib 133 is attached to the inner wall of said key 128 . Due to the rib 133, when the key is slid horizontally in order to assemble the key and the key frame together, the upper surface of the key guide 116 slides along the rib 133, thereby This prevents the driver 132 from touching the key switch 115 .

In said key device 129, a resilient member 138 providing a protruding hook 139 protrudes from a common base edge portion of said white key 128. The protruding hook 139 elastically fits into a hook hole 119 formed through the upright portion 118 of the key frame 112 , so that the key device 129 and the key frame 112 are fixed to each other. The key blocks 1281 , 1282 and 1271 of the key device 129 are stacked on top of each other and fixed with screws 137 . Thus, by means of hinge portion 136, a first one of said keys is supported by said key frame 112 at a common base portion of said keys. Therefore, the key can be freely rotated in the key depressing direction (ie, the vertical direction).

Simultaneously, drive positioning in the key length direction and width direction is performed between the key and the key pivot frame. This positioning is performed by means of said holes 125 and their corresponding projections (not shown) provided between said keys. If the key and the key frame are fixed together at a certain point, then the protrusion 123 and the guide hole 141 cannot function well to stop the minor rotation of the key unit. In order to stop this rotation of the key unit that must be firmly fixed to the key frame, this embodiment provides a fixing mechanism composed of the raised portion 143, the elastic member 138 and the upright portion 118, by which , the key unit can be precisely fixed on the key frame. Incidentally, two of the fixing mechanisms are provided for one octave width of the keyboard.

During this period, the panel 1311 is fixed to the upper case 131 by a wire sleeve (not shown) protruding from the upper case 131 . The upper shell 131 provides a switch panel, which includes a plurality of tone color selection switches 1312 mounted on the panel 1311 .

When assembling the keyboard as shown in Figure 21, the upper case is placed upside down on a base plate (not shown), the key frame 112 fixed to the key unit is also turned upside down, and the screws 1231 Inserted through the opening 122, the screw 1231 is also inserted through the hole 124 of the support element 145 provided in the guide part 123, and then the screw 1231 is inserted into the upper shell 131 attached The wire sleeve 154 , so that the key frame 112 fixed with the key unit is tightly connected with the upper shell 131 firmly. In this state, the inverted lower case 130 is brought to the top of the key frame 112, and the screw 1201 is inserted into the thread sleeve 126, so that the lower case 130 is tightly connected to the key frame 112. Pick up. Therefore, the assembly work for assembling the key unit, the key frame 112, the upper case 131 and the lower case 130 is thoroughly performed.

Figure 22 is a side perspective view showing the rear portion of the keyboard assembly not assembled together, wherein the key frame 112 is shown in top view and the key assembly 129 is shown in bottom view. FIG. 23 is a side perspective view showing a part of the rear edge portion of the key device 129, and FIG. 24 is a partial view of FIG. 23 . A guide hole 141 is formed through open base edge portions of three key blocks stacked and assembled therein and at a certain predetermined position meeting the guide portion 123 of the key frame 112 . A protruding portion 143 protrudes from the rear side of the guide hole 141 . A guide groove 142 is separately formed in the lower surface of the protruding portion 143 . At the entrance portion of the trailing edge of the guide groove 142, a taper 144 is formed. In this way, the entrance portion of the guide groove 142 will be enlarged.

The rear edge portion of the protruding portion 143 is bent upward to form an elastic member 138 . The elastic member 138 can be elastically bent in the length direction of the key. The aforementioned protruding claws 139 are also formed on the rear surface portion of the elastic member 138 . An upper edge portion of the elastic element 138 is also bent toward the rear to form a pressing element 140 . The rear edge portion of the guide portion 123 which is cut and bent upward from the key frame 112 is formed into an arc to form a guide surface 123a whose inside resembles a cone.

Next, assembling steps for assembling the key device 129 and the key frame 112 will be described with reference to FIGS. 25(A)-25(C). For convenience, the representation of the black keys is omitted in these drawings. First, the key device 129 is moved in the horizontal direction by sliding the guide rib 133 along the highest portion of the key guide 116 of the key frame 112 . As shown in FIG. 25(A), the highest portion of the guide portion 123 protruding from the key frame 112 cooperates with the guide groove 142 formed at the rear edge portion of the key device 129 .

Then, as shown in Figure 25 (B), the key device 129 slides to the rear direction (ie, the left direction of the drawings), so that the rear inner edge of the guide hole 141 reaches the guide hole 141. The trailing edge portion of the guide surface 123a of the guide portion 123. At this time, the driver 132 of the key device 129 is detached from the key switch 115 attached to the key frame 112 and located above it.

According to the state shown in FIG. 25(B), the key device 129 descends, thereby making the inner edge portion of the guide hole 141 along the guide surface of the guide portion 123 as shown in FIG. 25(C). 123a slides. In this case, the rear edge portion of the key device 129 descends in a natural falling manner, while the resistance affecting the descending movement of the key device 129 in the horizontal direction remains approximately at zero level. In this way, the driver 132 of the key device 129 descends from the upper position of the key switch 115 , so that the driver 132 elastically comes into contact with the switch 115 . Therefore, no force is applied to the key switch 115 in the horizontal direction.

Thereafter, the detent element 147 of the key arrangement 129 (which acts as an upper limit detent) is placed under the lower surface of the key guide 116 and provides a common base edge portion for the black keys. The upper surface 1271 is compressed such that the raised detent 139 is resiliently hooked onto the aperture 119 formed in the upright portion 118 of the key frame 112 . In this state, the bottom surface of the open base portion is in full contact with the upper surface of the rear edge portion of the key frame 112 . Thus, as shown in FIG. 21 , a fixed relationship in the horizontal direction is established between the key device 129 and the key frame 112 . In short, the keyboard device according to the present embodiment is designed such that at the contact portion to be formed between the key device 129 and the key frame 112, the rear edge portion of the guide hole 141 The sum of the thickness and the protruding length of the protruding portion 143 is equal to the distance between the standing portion 118 and the guide surface 123 a of the guide portion 123 protruding from the key frame 112 . Therefore, in the case where the bottom surface of the key device 129 is in contact with the upper surface of the key frame 112, the key device 129 cannot move in the horizontal direction of the key, so that the horizontal position of the key device 129 The frame 112 is firmly fixed relative to the key. Since the protruding claws 139 of the elastic elements 138 catch toward the claw holes 119 formed through the key frame 112, the vertical movement of the key device 129 is adjustable, in other words, during assembly. A fall-out event of the key arrangement 129 can be avoided during operation. By the way, when the key device 129 is moved again from the key frame 112, the pressing member 140 of the elastic member 138 is pressed backward against the elastic resistance of the elastic member 138, so that the The protruding claws 139 are released from the claw holes 119.

As mentioned above, the raised portion 143 and the elastic member 138 are placed between the upright portion 118 and the guide surface 123a of the guide portion 123, and then, the guide hole 141 follows the The guide surface 123a is lowered so that the key unit 129 is automatically guided to the key frame 112 in a predetermined direction.

26(A)-26(D) show another example of the assembly process, through which the key device 129 and the key frame 112 are assembled together. The assembly process shown in Figs. 26(A) and 26(D) is similar to that shown in Figs. 25(A) and 25(B). Therefore, their detailed descriptions are omitted here. After realizing the assembling step as shown in FIG. 26(B), due to the frictional force existing in some parts or the difference between the grease sprayed state of the key guide 116 and the brake member 147, the The descending speed of said key means 129 at its front part is different from that of said key means 129 at its rear part. In some cases, the slide guide 146 provided at the front edge portion of the key means 129 descends faster than the rear edge portion of the key means 129 . As described above, if the front edge portion of the key assembly 129 descends faster than the rear edge portion of the key assembly 129, the assembled state is as shown in FIG. 26(C). Fig. 26(C) shows the worst state of the bad drop of the key. However, in general, during the downward movement of the key, the mirror-angled portion 1331 of the rib 133 can slightly transmit a horizontal component of force to the key arrangement 129, thereby making the key The trailing edge portion and the leading edge portion descend simultaneously. In short, in general, the worst state shown in Fig. 26(C) can be avoided. But, if the kind of state shown in Figure 23 (C) has taken place, the driver 132 of described key device 129 will descend with the mode of nearly natural drop so, thereby can make described driver 132 can be displayed on the described key. above the switch 115. In this case, the driver 132 is positioned slightly away from the key switch 115 . In other words, even if such a transitional state occurs, it can be guaranteed that no force is applied to the key switch 115 in the horizontal direction. In the state where the key moves downward, a small horizontal component force is transmitted to the key, thereby causing the rear edge portion of the key device 129 to continuously descend. Thereafter, the rear edge portion of the key unit 129 descends in a manner similar to that shown in FIG. 25(C). In other words, while the inner edge portion of the guide hole 141 slides along the guide surface 123a of the guide portion 123, the key device 129 descends in an almost natural drop manner. As a result, the state shown in Fig. 26(D) can be obtained. As previously mentioned, after the driver 132 of the key device 129 moves down from the upper position of the key switch 115 attached to the key frame 112, the rear edge portion of the key device 129 further falls. Therefore, no force is applied to the key switch 115 in the horizontal direction.

Fig. 27 is a side perspective view showing another example of the rear edge portion of the key structure. In this example, no guide groove is provided in the protrusion portion 143 protruding rearward from the guide hole 141 . When assembling the key device to the key frame, the key is brought to the position shown in Fig. 25(B) or 26(B) instead of sliding on the key frame in advance. According to this state, while the inner edge portion of the guide hole 141 slides along the guide portion 123 attached to the key frame 112, the rear edge portion of the key device descends. Like this, as described in conjunction with accompanying drawing 25 (A)-25 (C) or 26 (A)-26 (D), described key device descends with the mode nearly natural drop, thereby makes the driver of described key and all The upper surface of the key switch 115 is in contact. For this reason, an arc portion or taper 148, which may be equivalent to the aforementioned arc-forming taper 144 (see FIG. 23 ) formed in the guide groove 142, is formed in the guide hole 141 so as to enlarge the guide hole 141. The opening of the lead hole 141. In this example, other parts than the above are similar to those of the previous example, so that the same operations and effects can be achieved.

Fig. 28 is a side perspective view showing still another example of the rear edge portion of the key unit. FIG. 29 is a side perspective view showing a detailed structure of the guide portion 123 provided on the key frame 112 and corresponding to the key device shown in FIG. 28. Referring to FIG. In these examples, the guide portion is made of resin material and molded independently of the key frame, or the guide portion 123 is formed as a part of the key frame 112 . In the key device 129 , the protrusion 151 protrudes downward from the rear raised portion 143 of the guide hole 141 . In order to match the protrusion 151 , a guiding groove 149 is formed on the upper surface of the guiding portion 123 . At the entrance portion of the guide groove 149, an arc portion or taper 150 is formed. Holes 124 are provided for fixing the upper case and the key frame 112 to each other. Below the hole 124, a larger through hole (not shown) is provided to match the screw cap, and a smaller hole (not shown) for guiding the larger hole is provided. ), like this, can avoid described screw cap to pass through this hole. A positioning hole 152 is formed through the key frame 112 at a position apart from the rear side surface of the guide portion 123 . This positioning hole 152 may correspond to the front hole 125 shown in FIG. 20 . In this embodiment, the positioning structure for the key unit is provided between the D key and the D# key.

In the vicinity of the guide structure (see FIGS. 28 and 29 ) provided between the G# key and the A key, the above-mentioned protrusion 151 and the hole 152 need not be formed. Initially, the protrusion 151 shown in FIG. 28 or the protrusion corresponding to the hole 125 (see FIG. 20 ) is provided to overcome the shrinkage of the head of the key unit made of the resin material and to be molded on the key unit. The accuracy error of the through hole in the key frame can be controlled, so that the key depressing movement can be performed smoothly. In short, these protrusions are provided as positioning structures, so that only one positioning point can be used to meet the positioning requirements.

When the key device and the key frame are assembled together, the key device 129 moves toward the key frame 112, and then the protrusion 151 attached to the key structure 129 is inserted into the guide groove 149. Inside the opening, at the opening, an arcuate portion 150 is formed. Then, the key device 129 is slid horizontally, so that the guide hole 141 and the guide portion 123 cooperate with each other. Similar to the previous example, the rear edge portion of the key device 129 descends in a manner that approximates a natural descent. When the key device 129 is completely lowered, the protrusion 151 of the key device 129 is inserted into the positioning hole 152 of the key frame 112, and at the same time, the protruding claw 139 of the elastic element 138 bite into the claw hole 119 of the key frame 112 . In this way, the positioning of the key device 129 relative to the key frame 112 in two directions of length and width can be realized. In addition, the key device 129 is also firmly fixed to the key frame 112 in the vertical direction.

In this example, both the guiding structure and the positioning structure are provided at almost the same location. In this way, it is possible to precisely perform the assembling operation and the positioning operation between the key device 129 and the key frame 112 at the same time. The result is that assembly work can be performed with high speed and precision. This is a great advantage of this example.

Fig. 30 is a side perspective view showing still another example of the rear edge portion of the keyboard device. According to this example, each of the keys is individually connected to the key frame 112 . At the common base portion 1531 of the key 153, the guide hole 141 having the raised portion 143 at its rear portion, the elastic member 138 and the extruding member 140 etc. are provided, and these are similar to the previous example . Near the rear edge portion of the key frame 112, a guide portion 123 corresponding to a key is provided. The guide part 123 may be independent of the key frame 112 and composed of the resin material, or the guide part 123 may be molded as a part of the key frame. In FIG. 30 , the guide rib 133 by which the key can slide in the horizontal direction is omitted from the illustration related to the key 153 .

In addition, the hole 124 for fixing the upper case and the key frame is formed at an appropriate position on the upper surface of the guide part 123 . For example, for one octave, two fixing holes 124 are provided, and they are arranged at positions respectively corresponding to the D key and the A key within one octave key group. In FIG. 30 , the rear side surface of the guide portion 123 stands vertically from the key frame 112 . However, the guide portion 123 may be modified to be at an oblique angle relative to the key frame 112, or to form a circular arc shape.

Figures 31(A)-31(C) will describe the assembly procedure, according to the present example, according to which the key 153 is assembled with the key frame 112. For the present example, many assemblers are provided, so a detailed description will be made with respect to each of them.

(1) The first assembly procedure

First, when supported by a finger, the key 153 is extended to a certain position so that the protruding portion 143 of the key 153 touches the upper surface of the guide portion 123 provided on the key frame 112 . With the support of the fingers, the guide groove 142 of the key 153 moves to the dropping point (dropping point) as shown in Figure 31 (A). At this drop point, the actuator 132 is positioned just above the key switch 115 . When the guide portion 123 is inserted into the guide hole 141 or at a later time, the finger is separated from the key 153 . After that, the rear edge portion of the key 153 falls almost naturally, so that the key 153 comes into contact with the key frame 112 . Thereafter, the common base portion 153 of the key 153 is depressed, causing the protruding hook 139 to snap into the hook hole 119 . In this way, the key 153 is completely installed with the key frame 112 .

The above assembly operation is repeated for each key. After all the keys have been fully assembled with the key frame, a common mounting plate (see Figure 34), whose length matches the full length of the keyboard, is compressed and secured to the rear edge portion of the key. When the same upper case is fixed, the key frame fixing the key is changed direction and fixed on the upper case. In this case, a screw is inserted through the four-legged screw sleeve 154, and the screw is also inserted into the hole 124 of the guide mechanism 123 fitted on the key frame 112, so that the upper shell is tightly squeezed together with the key frame 112. The fixing plate 155 provides a number of through holes 169 and screw holes 168 . The quantity of through hole 169 is equal to the quantity of guiding part 123, and the quantity of screw hole 168 can be adjusted like this, and promptly one screw hole 168 can be used for one, two or three keys, and fixing plate 155 is placed on common base edge part 1531 Therefore, the common base portion 1531 is sandwiched between the fixed plate 155 and the key frame 112 . After that, a screw 1532 is inserted into the screw hole 168, so that the fixing plate 155 is firmly fixed with the key frame 112 by means of the common base portion 1531.

(2) The second assembly procedure

First, the key 153 is held by a human hand or a manipulator, and then the key 153 is installed on the key frame 112 in such a way that the common base 1531 is fixed on the upper surface of the guide portion 123, and the slide guide 146 is fixed near the key guide 116. . In this case, the guide groove is fixed at the head of the guide portion 123 . An angle θ is formed between the horizontal portion of the key frame 112 and the surface of the key 153 . As described above, this angle θ is defined as "θ1". According to this, when a free edge portion of the key 153 is reversely changed in position by a human hand or a robot arm, the angle θ is gradually increased. Meanwhile, when the trailing edge portions of the guide holes 141 touch the trailing edge portions of the guide portion 123, the angle θ can be defined as follows: θ=θ0>θ1. Fig. 31(B) shows this situation, in which the rear edge portion of the key 153 is fixed just before the drop point. For this case, the height of the guide portion 123 or the height of the actuator 132 is determined such that the actuator 132 does not contact the key switch 115, and the actuator 132 is placed slightly away from the key switch 115. Afterwards, the key 153 is further lightly pressed in the opposite direction, so that the rear edge portion of the key 153 falls to contact the key frame 112 . The following steps of the device assembling procedure are similar to the above assembling procedures, therefore, their description will be omitted.

Next, the advantages of the existing embodiments will be described in detail. Generally, when considering the number of parts, switch driving precision and overall thickness of the keyboard device, it is necessary to design some keyboard devices whose keys are fixed independently of the key frame and whose height is low.

In this prior embodiment, before the key is slid back, the angle θ is equal to θ1, and this angle θ is θ0, θ0>θ1.

It is expected that the actuator 132 is slightly off the key switch 115 just before the key is dropped. Even when the distance between the actuator and the key switch is set to 1 mm when actually designing the structure of the key device, the distance should be increased to 2 mm in order to cope with manufacturing errors of the key device. In this case, the distance between the actuator and the key switch is increased by 1 mm, however, the height of the guide portion 123 should be increased by 5-6 mm, since the height of the guide portion 123 is proportional to the increase in the distance between the actuator and the key switch. Change. In the present example, a vertical positional relationship is strongly maintained between the actuator 132 and the key switch 115, and this is just before the assembly operation is performed, in other words, just before the key is dropped. Therefore, the allowable distance range between them can be reduced so that the distance between them can be set to 1 mm. Even when actually constituting the keyboard, such a small distance of 1 mm is roughly cleared to zero, there is a small gap between the guide portion 123 and the guide hole 141, so that even if the actuator 132 depresses the key lightly in its lateral direction Switch 115 moves until it begins to drop, so that the pressure is completely removed just before the key drops. Therefore, it is possible to improve the relationship between the keys and the key frame. Furthermore it is possible to make the thickness of the key device smaller.

Fig. 32 is a side view illustrating still another keyboard device. According to the first feature of this example, the assembling operation and the positioning operation for the key unit and the key frame can be performed simultaneously or immediately. According to the second feature, the guide portion is attached to the key. When assembling the key and keyframe together, the temporary stop helps the assembly operation to go faster. Accordingly, the present example provides the protruding portion 1235, which functionally performs both the guide portion operation and the temporary braking operation, wherein the lower edge portion constituting the protruding portion 1235 is circular. The raised portion 1235 is designed below the lower surface of the common base of the key unit. More precisely, one protrusion is provided between the D key and the D# key, and another protrusion is provided between the G# key and the A key. A concave portion (or a through hole) 1125 is formed in the key frame, wherein the shape of the concave portion 1125 is designed to match the circular shape of the protruding portion 1235 . The rest of this example is similar to the previous example (refer to FIGS. 20, 21, 22, 25(A)-25(C) and 26(A)-26(D)), and therefore, description will be omitted.

The protruding portion 1235 is guided by the concave portion 1125 and then temporarily stopped by the key frame 112 . When the protruding portion 1235 is fixed on a certain position of the key frame 112 , the hook 139 snaps into the upright portion 118 to form the hook hole 119 . Protrusion 1235 is fixed on a contact point, and at this point, its front edge face contacts with the front edge face of recess 1125, and the rear side of elastic element 138 is fixed together with upright part 118, like this, they mutually mutually. under pressure. By improving the fitting precision between the hook hole 119 and the hook 139, it is possible to fully realize the positioning operation between the key unit and the key frame. In this case, the key unit and the key frame are fixed together in all directions, for example, in the width direction of the key, the longitudinal direction and the vertical direction. By the way, such positioning can also be achieved by improving the fitting precision with respect to the two pairs of hook holes 119 and hooks 139, so that for the other pair of hook holes and hooks, in the width direction of the key, the hook The holes can be enlarged slightly. In the present example, two pairs of convex and concave portions are provided with respect to the key unit of an octave keyboard. To adjust the movement of the key unit in the width direction of the key, a pair of convex and concave parts is provided as a first engagement mechanism in which the width of the convex part matches the width of the concave part, and for the other pair of convex and concave parts, a pair of convex and concave parts is provided. A certain gap. Adjacent to the first engaging mechanism, a pair of hooks 139 and hook holes 119 are provided as the second engaging mechanism, and since the first and second engaging mechanisms are provided, it is possible to completely determine the positional relationship between the key unit and the key frame.

Fig. 33 is a perspective view illustrating the rear edge portion of the key assembly of the keyboard device. It is illustrated here that two key units 157 and 158 are assembled together, wherein the key unit 157 provides a C key, an E key 163, a G key and a B key (wherein, the C, G and B keys are not shown), and the other A key unit 158 provides a D key 164, an F key 165 and an A key (not shown). The description of the black key unit is omitted, but it may be provided under the key unit 158 . In the perspective view, the rear key unit is at the lowest position compared with the white key portion, however, in the assembled view shown in Figs. 21 and 22, the black key unit is at the highest position. Many protrusions are formed on the key unit 157 where the E key 163 is provided. A plurality of recesses 160 each corresponding to the protruding portion 159 are formed on the key unit 158 to be fitted with the key unit 157 . In each recess 160 there is a reinforcing rib structure 166 . When the convex portion 159 is engaged with the concave portion 160 , the reinforcing rib 166 is deformed, slightly damaging the outer wall of the convex portion 159 . In this way, they are both securely fixed together by means of ribs 166 and are pressed against each other. Numeral 161 denotes a projection, which is used to determine the positional relationship between the key units 157 and 158 . The protrusion provided in the concave portion 160 of the key unit 158 is inserted into the positioning hole 162 formed in the upper wall of the convex portion 159 of the key unit 157 . In each of the key units 157 and 158, a plurality of through holes 167 are formed. The through hole 167 of each key unit 157 matches the through hole 167 of each key unit 158 . These through holes 167 serve as screw holes. Insert the screw 137 (see FIG. 21) into the screw hole, and the key assembly including the key unit will be securely fixed with the key frame.

Guide grooves and guide holes 141 are formed in the key unit 157 fixed at the lowest position when all the key units are assembled together. In another key unit 158 , another guide hole 141 is formed to match the guide hole 141 of the key unit 157 . Similar to the key assembly described above, the key assembly shown in FIG. 33 can be assembled together by dropping the guide hole 141 along the guide portion of the key frame without damaging the key switch.

[C] The third embodiment

Front perspective view 19 shows the key assembly according to the third embodiment. Here, a through hole 208 is reused. A screw is inserted through the through hole 208 when fixing the key device to the main body of the musical instrument.

The cross-sectional shape of the reinforcing rib 38 is mainly triangular, and the reinforcing rib 38 extends along the inner wall of the concave portion 37 in the vertical direction. In order to apply proper pressure between the outer wall of the convex portion 33 and the inner wall of the concave portion 37 when the two key units (i.e. key blocks) 22 and 23 are assembled together, the vertical angle of the triangular reinforcing rib 38 is equal to 90°, while its The height is, for example, 0.1 mm-0.2 mm. In order to smoothly complete the insertion operation between the convex portion 33 and the concave portion 37, it is desirable to form a circular portion with a radius R=0.3 mm at the inlet edge portion of the concave portion 37.

Fig. 35 is a perspective view illustrating a modification of the third embodiment. In this example, the aforementioned reinforcing rib 38 is formed on the outer surface of the convex portion 33 . Here, three key units, namely, one black key unit 222 and two white key units 224 and 226 are provided. These three key units 222, 224 and 226 are assembled to form an octave portion of the keyboard. In the black key unit 222, a plurality of black keys 221 are supported by a common base portion 227, and they can freely swing. An inner (not shown in FIG. 35 ) portion of the common base portion 227 is formed as the above-mentioned concave portion, into which the convex portion 33 of the white key unit 224 enters. In Fig. 35, only two black keys 221 are illustrated, but actually five black keys should be provided, corresponding to symbols C#, D#, F#, G# and A#, respectively. A plurality of white keys 223 are assigned to a common base portion 228 of the white key unit 224, and they can freely swing. In FIG. 35, only two white keys 223 are illustrated, but actually three white keys should be provided, which correspond to symbols D, F and A, respectively. Likewise, a plurality of white keys 225 are assigned to a common base portion 229 of the white key unit 226, and they can swing freely. In Fig. 35, only two white keys 225 are illustrated, but actually four white keys should be provided, which correspond to symbols C, E, G and B respectively.

In the third embodiment as shown in FIG. 19 or 35 , two reinforcing ribs 38 are respectively formed on the two side walls of the concave portion 37 or the convex portion 33 . However, it is possible to provide only one reinforcing rib 38 for one recess 37 or one protrusion 33 . Of course, the position, size or fitting interval of the ribs 38 can be changed at will. The shape of the reinforcing rib 38 is not limited to the above-mentioned triangular shape. The shape of the reinforcing rib can be changed to semi-cylindrical, hemispherical, etc.

[D] Fourth embodiment

Next, referring to Figs. 36-38, a fourth embodiment of the present invention will be described in detail. This embodiment is provided to avoid conduction errors of circuit components mounted on a circuit board. More specifically, when the key is depressed to be guided by the key guide mechanism, a predetermined type of lubricant such as grease is applied to the sliding contact portion of the key guide mechanism to prevent unwanted sound from being generated. However, for the same case, the lubricant may overflow to the circuit board, leading to conduction errors of the switching elements provided on the circuit board. To overcome this disadvantage, the fourth embodiment is characterized by the provision of a special mechanism, such as reinforcing ribs, for preventing lubricant from flowing to the circuit components.

Fig. 36 is a sectional view illustrating a main part of a keyboard device provided to an electronic musical instrument according to a fourth embodiment of the present invention.

The keyboard provides a key 301 and a key frame 303 . The key frame 303 supports and fixes a rear edge portion of the key 301 . The key frame 303 is made of a metal plate with elastic stability, and is used to support the key 301 so that the key 301 can swing up and down in the key depression/release direction (see arrow A).

The key 301 includes a white key 304 and a black key 305, each of which is made of a resin material and is shaped like a block. A predetermined number of white keys and black keys corresponding to an octave or half octave keyboard are arranged in parallel in one key unit.

Similar to the previous embodiment, this fourth embodiment provides three common base portions which are gathered together at the rear edge of the key 301 . Here, every two common base portions 304a and 304b correspond to white keys, while one common base portion 305a corresponds to black keys.

A through hole is formed through three common base portions 304a, 304b and 305. Along with a supporting point 302 of the chain 301, a square screw sleeve 308 is attached to and partially inserted into the lower surface of the key frame 303, after which screws 307 are inserted through the through holes and screwed into the square screw sleeve 308. In this way, the four-point screw sleeve 308 is firmly fixed under the lower surface of the key frame 308, and the three common base portions 304a, 304b and 305 are also firmly fixed to an upper surface of the key frame 303.

The two side walls (see right part) of the front of the white key 304 partially project downwards to form detent elements 304C each having a pictograph "L". A one-key guide mechanism 309 is provided corresponding to a pair of stopper members 304c. In the present example, some parts of the front edge portion of the key frame 303 are formed with a width which is slightly smaller than the width of the key 304; The underside of the key; accordingly, the outer portion of the suspension portion of the key frame 303 is covered by a guide mechanism made of resin material (such as a sound-absorbing material such as a plastic elastic or foamed medium) so as to form a key guide Agency 309. Lubricant is applied to both side surfaces of the key guide 309 which slides with the white keys 304. As shown in FIG. The inner walls of the stop member 304c are slidable along the side surfaces of the key guide 309 . This sliding operation will prevent the key from wobbling when moving the key up and down in the key depression/release direction.

Similar to the white keys 304, the black keys will provide a detent element similar to the detent element 304c described above. In response to these detent elements of the black keys 305 , an additional key guide mechanism 309 is formed at the front edge portion of the key frame 303 .

On one surface of the key frame 303 facing the lower surface of the white keys 304, a circuit board 311 is attached. Alternatively, the circuit board 311 could be placed close to the key frame 303, with switch contacts and the like mounted on the circuit board 311. The two-key switches 310 respectively correspond to the white keys 304 , and the black keys 305 are mounted on the circuit board 311 .

Similar to the key switches described above, the key switch 310 includes fixed contact points and movable contact points. The fixed contacts are formed on the circuit board 311 , while the movable contacts are included in an inner portion of the elastic protrusion mechanism 312 . For example, the fixed contacts are formed by a pair of non-conductive elements each having a comb-like shape or a letter "E"-like shape, wherein these elements are arranged on the circuit board 311 in parallel. The exterior of these elements is sealed with a circular carbon stamp.

In this elastic protrusion mechanism 312, a cylindrical protrusion is formed to protrude downward. On the lower edge face of the cylindrical protrusion, a movable contact is formed so that the movable contact is parallel to the fixed contact. The circular movable contact is made of conductive elastic material such as conductive rubber.

The elastic protruding mechanism 312 is basically made of plastic elastic material such as rubber. The annular ring 313 is formed on the upper portion of the elastic protrusion mechanism 312, and the actuator 314 protrudes downward from the lower surface of the white key 304 (or from the lower surface of the black key 305). When the key is depressed, the actuator 314 presses the annular ring portion 313, whereby the elastic protrusion 312 is elastically deformed, so that the movable contact is lifted downward to contact with the fixed contact formed on the circuit board 311, so that , the key switch 310 is turned on. Then the tone came out.

Meanwhile, a step portion 315 is formed at a certain portion of the key frame 303 between the key guide 309 and a free edge portion 311a of the circuit board 311 . The step portion 315 extends continuously in the direction in which the keys are arranged. The vertical plane of the step portion 315 is lower than the circuit board 311 .

The circuit board 311 is fixed to the key frame 303 such that its free edge portion protrudes slightly from a wall portion 315 a of the step portion 315 toward the key guide mechanism 309 .

A screw base 303 a is formed under the step portion of the key frame 303 . The screw base 303a formed with screw holes in the downward direction is fixed to an edge portion of the main frame 316 with a screw 317. The above-mentioned four-corner screw sleeve 308 is fixed on the other edge portion of the main frame 316 with a screw 318 . In this way, the entire keyboard device is firmly fixed with the main frame 316 .

The key brake portion 304d protrudes downward from the white key 304 close to the brake member 304c, and the lower limit stopper 309a for adjusting the swing of the white key 304 in the pressing direction of the key is formed as a certain part of the upper surface of the key guide mechanism 309, when the key brakes The portion 304d is in contact with the lower stopper 309a, and when the white key 304 is depressed, the lower position of the white key 304 is restricted. On the other hand, an upper limit stopper 309b is formed as a certain part of the lower surface of the key guide mechanism 309 . When the braking element 304c is in contact with the upper limit stopper 309b, the white key 304 returns from the key pressed position, and the upper position of the white key 304 will be limited.

Similar to this, the upper and lower side positions of the black key 305 are respectively limited by the upper and lower limit stoppers.

On the lower surface of the key frame 303, an auxiliary circuit board 319 is fixed with screws inserted into two four-corner screw sets 322 respectively.

As described above, since the circuit board 311 is located close to the key guide 309, there is a possibility that a small amount of lubricant 320 coated on both side walls of the key guide 309 may slowly overflow toward the circuit board 311. For some cases, the spilled lubricant 320 creates a conduction error at the contacts of the key switch 310 .

To avoid lateral rocking movement of the keys, the gap formed between the side walls of the key guide 309 and the inner walls of the white keys 304 (or black keys 305) must be minimal. When the white key 304 is assembled with the key frame 303, the brake elements 304c of the white key 304 are fixed in such a way that they partially overlap with the key guide mechanism 309; then, the white key 304 is pressed in the left direction of FIG. 36 . At the same time, the stopper member 304c can partially wipe off the lubricant coated on both side walls of the key guide mechanism 309, so that the frictional lubricant can easily move toward the circuit board 311.

But according to the current practice, even if the lubricant 320 overflows from the key guide mechanism 309 to the circuit board 311, the step portion 315 between the free edge portion 311a of the key guide mechanism 309 and the circuit board 311 will prevent the lubricant 320 from rolling, So that the flowing lubricant does not reach the upper surface of the circuit board 311 .

Furthermore, the circuit board 311 of this embodiment is fixed in such a way that its free edge portion 311a slightly protrudes from the wall portion 315a of the step portion 315 toward the key guide mechanism 309 . This position of the circuit board 311 will in turn prevent the flow of lubricant 320 reaching this circuit board 311 .

Therefore, the lubricant 320 does not flow to the contacts of the key switch 310 mounted on the circuit board 311 . In this way, a conduction error of the key switch 310 is not generated.

Incidentally, the position of the circuit board 311 can be modified such that its free edge portion 311a does not protrude from the wall portion 315a of the step portion 315 . Even with such an improved position of the circuit board 311 , the step portion 315 can satisfy the requirement of preventing the flowing lubricant 320 from flowing to the circuit board 311 .

FIG. 37 is a side view of main parts illustrating another example of the key frame 303, wherein the same parts as those shown in FIG. 36 will be denoted by the same numbers.

If compared with the fourth embodiment shown in FIG. 36, this embodiment is characterized in that a rib 321 is used instead of the step portion 315. The reinforcing rib 321 is provided between the free edge portion 311a of the circuit board 311 and the key guide mechanism 391 to prevent the lubricating oil 320 from overflowing to the key switch 310.

Even if the lubricating oil 320 coated on the key guide mechanism 391 overflows toward the circuit board 311, the reinforcing rib 321 prevents the flow of the lubricating oil 320, whereby the lubricant 320 no longer overflows to the circuit board 311. Similar to the above embodiment in which the step portion 315 is provided, the reinforcing rib 321 provided in this embodiment can prevent the lubricant 320 from flowing to the contacts of the key switch 310 , in other words, it is possible to avoid the transmission error of the key 310 .

Incidentally, the reinforcing rib 321 can be made of a resin material regardless of the key frame 303, so that the reinforcing rib 321 is firmly attached to the key frame 303. Perhaps the reinforcing rib 321 could be part of the key frame 303 . In that case, some parts of the key frame 303 made of a metal plate are bent upward by stretching or other methods to form the reinforcing rib 321 .

It is possible to further improve this example by providing both the stepped portion 315 and the reinforcing rib 321 . In this case, the step portion shown in FIG. 36 is formed on the key 303 at a position between the circuit board 311 and the key guide mechanism 391, and the reinforcing rib 321 is designed on the bottom surface of the step portion 315 so as to prevent lubricant 320 overflows to circuit board 311.

According to the above modification, even if the lubricant 320 coated on the key guide mechanism 391 overflows to the circuit board 311, the lubricant flowing beyond the reinforcing rib 321 must be stopped by the wall portion 315a of the step portion 315. In short, the rolling lubricant can be prevented from reaching the upper surface of the circuit board 311, and therefore, it is of course possible to avoid causing a conduction error at the contact formed on the circuit board 311.

FIG. 38 is a side view illustrating main parts of another example of the key frame 303 and key 301, wherein the same parts as those shown in FIG. 36 will be denoted by the same numbers.

Different from the above-mentioned embodiment shown in FIG. 36, the reinforcing rib 321a for preventing the flow of lubricating oil 320 protrudes from the upper edge of the key guide mechanism 309, facing the circuit board 311. In the key guide mechanism 309, the lower limit stopper 399 is formed as Part of the key guide mechanism 309.

Similar to the above-mentioned embodiment and modified example, the reinforcing rib 321 a of this example can prevent the lubricant from the key guide mechanism 309 from overflowing to the circuit board 311 . Since the reinforcing rib 321a and the lower limit stopper 399 are formed as a part of the key guide mechanism 309, it is possible to reduce the manufacturing cost of the key apparatus compared with the case where the reinforcing rib is formed independently in the above example.

As shown in FIG. 38, when the key 301 (corresponding to each of the white key 304 and the black key 305) contacts the lower limit stopper 399, a gap s is present between the key stopper portion 304d and the reinforcing rib. Therefore, even if the key 301 is depressed to the lower limit position as shown in FIG. 38, under the situation that the lubricant 320 overflows to the upper surface of the lower limit stopper 399, there is almost no such possibility that the lubricant 320 exceeds the reinforcing rib 321a. And overflow to the circuit board 311.

Furthermore, in this example, the key stop portion 304d is designed so that it does not contact with the reinforcing rib 321a. Therefore, the reinforcing rib 321a will not affect at all the key drop stroke of the key 301 (ie, the rotational stroke of the key 301, which is limited by the lower limit stopper 399).

[E] Fifth Embodiment

Then, a detailed description will be given according to a fifth embodiment of the present invention. The special feature of this embodiment lies in the specially designed key switch structure added to the keyboard device according to the present invention.

It is generally difficult to securely attach key switches to circuit boards. In some cases, prongs surrounding the exterior of the keyswitch insert and snap into holes in the circuit board, securing the keyswitch to the circuit board. This key switch structure is effective for attaching the key switch to the circuit board if the circuit board has a certain rigidity. But in the case of deformable printed circuit boards, this structure does not work well. Keyswitches, on the other hand, can be attached directly to the circuit board with an adhesive medium. But in this case, in order to obtain sufficient bonding strength, it is necessary to obtain a certain size on the circuit board as the bonding area. This is a disadvantage because such an adhesive area restricts the shape and structure of the key switch, and at the same time reduces the degree of freedom in the operation of the key switch.

In order to overcome the above-mentioned situation, the present embodiment provides three kinds of key switches of new structure, which can be easily attached to the keyboard device according to the present invention.

Fig. 39 is a sectional view illustrating a mechanism structure of a keyboard device applied in a fifth embodiment of the present invention, and Fig. 40 is a perspective side view illustrating a key switch in which a pair of elastic projections are formed. Briefly, the sectional view of Fig. 39 is obtained by cutting the key switch shown in Fig. 40 with the line X-X.

As shown in FIG. 39, the key switch 410 is mainly composed of a base plate 412 which functions as a base structure for the key switch, and a bulging portion 414 having a dome shape and an elastic bulging portion 411. The fixed contact 415 is added on the base plate 412; the movable contact 413 is attached to the inner wall of the bulging part 414 relative to the fixed contact, and the pressurizing part 416 is formed outside the surrounding elastic bulging part 44; the opening 418 is formed by a sheet-shaped pressurizing mechanism , so that the bulging portion 414 of the elastic bulging portion 44 is inserted into the opening 418 and engages with the opening 418 of the pressing portion 417 .

As shown in Figure 40, many elastic and bulging parts 411 with a quantity equal to 6 (corresponding to the half-octave (sound) section of the keyboard) or 12 (corresponding to an octave (sound) section) are arranged at equal intervals in a line, and the lower edge part They are connected together with a pressurizing part 416 . These elastic swelling portions 411 and pressurizing portions 416 are formed as one unit.

The elastic swelling portion 411 is formed of a plastic and elastic material such as rubber. This elastic bulging portion 411 provides the above-mentioned dome-shaped bulging portion 414, a cylindrical portion 419, an annular ring 421 and a movable contact 413, and the cylindrical portion 419 protrudes downward from the center of the inner wall of the bulging portion 414; the annular ring Portion 421 is on the opposite side of cylindrical portion 419 ; movable contact 413 is partially fused and attached to the lower edge surface of cylindrical portion 419 . The disc-shaped movable contact 413 is made of a conductive elastic material such as conductive rubber. When the annular ring portion 421 is pressed by an external force in the direction AA, the bulging portion 414 is partially deformed, so that the movable contact 413 moves downward to contact the fixed contact 415 attached to the base plate 412 .

The substrate 412 is made of bakelite printing board or thin plastic printing board. A pair of non-conductive elements, each having a comb or letter "E" shape, and its exterior surrounded by a nearly circular element. This forms the fixed contact 415 . The fixed contact 415 is formed at a fixed position on the substrate 412 by carbon powder printing or the like, and it is opposite to the movable contact 413 of the elastic bulging portion 411 .

As shown in FIG. 40, positioning projections 422 are formed downwardly under the pressing portion 416 between the elastic bulging portions 411 arranged in a line at equal intervals. The number of positioning projections 422 is determined such that a group of elastic bulging portions 411 formed continuously by the pressing portion 416 and connected together can be fixed to the base plate 412 simultaneously and efficiently. For example, 3 or 4 positioning protrusions are provided for one key block. A plurality of positioning holes 423 are respectively formed through the base plate 412 as long as the protrusions 422 can be matched with them respectively. By inserting the protrusion 422 into the hole 423, it is possible to precisely fix the position of the elastic bulging portion 411. In this way, each movable contact 413 can be fixed at an accurate position facing the fixed contact 415 .

The above-mentioned sheet-like pressing portion 417 is made of, for example, a prepreg. A plurality of openings 418 are formed by the pressurizing mechanism 417 , therefore, the bulging portion 414 of each elastic bulging portion 411 can be smoothly inserted through the opening 418 of each pressing portion 417 . When the elastic bulging portion 411 is inserted through the opening 418 of the pressing mechanism 417 , the peripheral portion of the pressing mechanism 417 is fixed outside the edge portion of the pressing portion 416 .

In order to securely fix the elastic bulging portion with the base plate 412, after the protrusions 422 are respectively engaged with the holes 423 of the base plate 412, the following steps will be performed. First, the viscous medium with large viscous strength is applied to the predetermined position 412a of the substrate 412 fixed on the outside of the pressurizing part 416; The hole 418 is inserted; thereafter, the pressing mechanism 417 is bonded to the substrate 412 in such a manner that the pressing portion 416 connected with the elastic bulging portion 411 is pressed by the pressing portion 417 . As described above, the pressing portion 416 and the elastic swelling portion 411 are firmly fixed by the pressing portion 417 . In this way, it is possible to establish an accurate positioning relationship among the elastic bulges 411 on the substrate 412 .

Therefore, it is possible to easily attach the key switch 410 to the circuit board only by adhering the pressing mechanism 417 to the substrate 412 at the time of pressurizing the pressing portion 416 of the elastic swelling portion 411. As a general rule, where the elastic bulge is directly bonded to the circuit board, the area of the lower surface of the elastic bulge should be limited such that sufficient bonding strength can be obtained. Compared with this case, the present embodiment is advantageous in that the shape of the elastically bulging portion of the key switch 410 is not limited to the above-mentioned factors. Thus it is possible to improve the degree of freedom in designing the shape of the key switch.

Furthermore, due to the structure of the key switch described above, there is no interlayer caused by the viscous medium between the upper surface of the substrate 412 and the lower surface of the pressing portion 416 .

For the general case described above, a viscous medium layer must be formed between the lower surface of the elastic swelling portion and the upper surface of the substrate. Such a viscous medium layer may slightly change its thickness by the amount of viscous medium or the viscous pressure applied between the elastically swollen portion and the substrate.

The difference in the thickness of the viscous medium layer can lead to a difference in the distance between the movable joint and the fixed joint. If one type of contact is used as a key switch, this difference does not affect the operation of the key switch. However, for the so-called multi-type contact type touch response switch, the above-mentioned small thickness difference will affect the detection of the touch response. In other words, this may cause some deviation in the touch-response operation of the switches each serving as the keys lined up on the keyboard of the musical instrument. Alternatively, this may cause other deviations in the touch-response operation in the instrument.

Since there is no viscous medium layer in this embodiment, even in the case of a two-type contact type touch response switch as shown in FIG. 41, there is no touch-response operation deviation in keys or musical instruments. The contact-response switch shown in FIG. 41 provides a pair of a first movable contact 4131 and a first fixed contact 451 and another pair of a second movable contact 4132 and a second fixed contact 452 . Thus, the present embodiment has the advantage that a touch-response switch with high precision can be implemented at a relatively low cost.

Incidentally, when the pressing mechanism 417 is adhered to the substrate 412, an adhesive medium may be coated on the lower surface of the pressing mechanism 417. Alternatively, double-sided tape may be attached to the press mechanism 417 or substrate 412, or other bonding techniques may be used.

In addition, a viscous medium may be coated on the upper portion of the pressurizing portion 416 of the elastic swelling portion 411 or 411a. Similarly, when double-sided tape is used, the tape can be glued to the upper portion of the pressurized portion 416 of the elastic swelling 411 .

Fig. 42 is a sectional view of a keyboard device in which the above-mentioned switch device is assembled.

In FIG. 42 , a key switch 410 is mounted on a main frame 429 at a position corresponding to a white key 425 or a black key 426 .

Similar to the above embodiments, there are provided three common base portions 425a, 425b and 216a. The common base portions 426a corresponding to the black keys are accumulated on the common base portions 425a and 425b corresponding to the white keys, respectively.

Under the condition that three key blocks are accumulated, the screw 428 is inserted into the screw hole 427, thereby screwing the key set together with the main frame 429 made of metal plate as a whole.

A pair of detent elements 425c shaped like a letter "L" respectively protrude downward from the two side walls of the white key 425 . The key guide mechanism 431 is secured to the main frame 429 in response to the detent member 425c. When the leading edge portion of the white key 425 is lifted up or down, the inner wall of the stop member 425 slides along the side surface of the key guide mechanism 413, whereby the lateral swing movement of the white key 425 can be avoided.

The key switch 410 is fixed at a predetermined position on the main frame 429 in response to each of the white key 425 and the black key 426 . The actuator 432 protrudes downward from the lower surface of the key such that the actuator faces the key switch 410 . When the key is depressed, the actuator presses down the upper portion of the key switch 410, causing the bulging portion 414 to elastically deform. At this time, the movable contact 413 shown in FIG. 39 is in contact with the fixed contact 415, so that the key switch 410 is turned on, resulting in the generation of the tone corresponding to the pressed key.

Incidentally, the contact surface 432a of the actuator 432 which contacts the key switch 410 can be shaped like a letter "H". In this case, it is possible to stabilize the pressed state between the actuator 432 and the annular ring 421 of the key switch 410 .

Fig. 43 shows another example of key switches. This example is characterized in that a plurality of projections 435 are provided which are formed on the pressing portion 416 of the elastic swelling portion 411 so as to establish a positioning relationship between the elastic swelling portion 411 and the pressing mechanism 417 . For example, two protrusions 435 are formed on the pressing portion 416 of the elastic bulge 411 . Furthermore, a plurality of holes 436 are formed through the pressing mechanism 417 at certain positions corresponding to the above-mentioned protrusions 435 . Other parts illustrated in FIG. 43 are similar to those of the above-mentioned embodiment shown in FIG. 41, and therefore, will be briefly described in detail.

According to this example, by inserting the protrusions 435 into the holes 436 respectively, it is possible to easily fix the positional relationship between the elastic bulging portion 411 and the pressing mechanism 417 . Due to the above-mentioned fixed structure, the outer diameter of the through hole 418 of the pressurizing mechanism 417 can be enlarged relatively, so that the elastic bulging part 411 can be easily covered by the pressurizing mechanism 417, and the bulging part 411 of the elastic bulging part 411 is inserted through the pressurizing 417. Even in this case, it is possible to accurately fix the position of the pressing mechanism 417 relative to the elastic bulging portion 411 . In short, it is possible to improve the performance of assembly operations.

Incidentally, the structure of the key switch 410 is not limited to that shown in FIG. 40, in which the elastic bulging portions 411 are continuously fixed at adjacent positions. In other words, it is possible to improve the key switch in such a way that one elastic bulging portion is respectively fixed to another elastic bulging portion adjacent to it. In this case, it is necessary to provide two or more protrusions 422 on one elastic swelling portion 411 .

Fig. 44 is a sectional view illustrating another switch device, which provides a switch having an elastic bulging portion and another diaphragm switch, wherein the same parts as those shown in Fig. 39 are denoted by the same numerals.

In this switch member, a pressing mechanism 447 made of a resin film in sheet form is used instead of the above-mentioned pressing mechanism 417 shown in FIG. 39 . The pressing mechanism 447 is larger in size than the pressing mechanism 417 described above. The constricted portion 446 is formed at a predetermined position apart from the elastically expanded portion 411 in the pressing mechanism 447 . The shortened portion 446 has a predetermined height. Such abbreviated portion 446 can be made from a metal mold. An upper contact 448 is attached to the inner surface of the reduced portion 446 , and a lower contact 449 is fixed on the substrate 412 facing the upper contact 448 . Thus, a diaphragm switch 440 is formed by contacts 448 and abbreviated portion 446 .

Each of the upper contact 448 and the lower contact 449 is formed of a metal pattern made of a predetermined material such as copper (Cu) or silver (Ag), and carbon powder is applied to the metal. Under normal circumstances, both joints 448 and 449 are fixed separately from each other. When the constriction portion 446 is depressed, these contact points 448 and 449 contact each other, whereby the diaphragm switch 440 is turned on.

In the present switch device as shown in FIG. 44, it is possible to form two types of switches including the diaphragm switch 440 at the same time. When such a switch device is used as a key switch of an electronic musical instrument, it is possible to further reduce the manufacturing cost of the entire instrument. In turn, it may be used as the size of an electronic musical instrument switch.

This type of switch device can be used for tone switches, sound effect switches or push button switches (ie partial selection switches), rather than key switches for keyboards of electronic musical instruments. Alternatively, it is possible to use this switch device for a push button switch of an audio device.

[F] Sixth Embodiment

Finally, a sixth embodiment of the present invention will be described with reference to FIGS. 45 and 46. FIG. This embodiment is characterized by a reduced thickness of the keyboard device. Generally, a certain vertical length between the upper surface of the key and the upper surface of the keyframe should be ensured so as to avoid lateral swinging movement of the key when the key is depressed. By reducing the length of the key frame. It is possible to reduce the thickness of the keyboard. However, reducing the thickness of the key frame in this way can also reduce the stability of the keys moving in the lateral direction. Thus typical keyboard devices suffer from a relatively large thickness at their front.

This embodiment was invented in order to reduce the thickness of the keyboard device at its front portion.

Fig. 45 is a side view illustrating the mechanical structure of a keyboard device according to a sixth embodiment of the present invention. In FIG. 45, a white key 501 is connected to the connecting portion 503 by means of the hinge portion 503. As shown in FIG. A black key 504 is also connected to the connecting portion 503 . The key frame 503 is firmly fixed to the main body (not shown) of the instrument. The key 501 can swing up and down around the hinge 502 . A key frame corresponding to each key is arranged in parallel under a row of keys. On each key frame 505, a key switch 506 made of elastic material is assembled on the key frame 505 opposite to each key. An actuator 513 is attached to the lower surface of the key 501 . The actuator 513 is fixed such that the key switch 506 is driven by the actuator 513 when the key is depressed.

An additional key guide mechanism 507 is added to the front edge of the key frame 505, which is made of polyurethane (L) foam plastics or other elastic materials. The key guide is bent partially downward from the lock frame 505 .

FIG. 46 is a perspective side view illustrating the key guide mechanism 507. As shown in FIG. The guide mechanism mainly consists of a guide part 510 and a braking element 511 . The guide portion 510 protrudes downward from the key frame 505 , and the braking element 511 protrudes toward both sides of the key frame 505 . The side walls of the guide portion 510 are formed as guide surfaces along which the key 501 is raised and lowered. This guide surface is provided to avoid lateral rocking movement of the key 501 . A pair of guided portions 508 protrude downward from the key 501 so that the guide portion 510 is sandwiched therebetween. The detent portions 509 each protrude in a hook shape from the lower edge portion of the guided portion 508 in the longitudinal direction of the key 501 . When the key 501 returns from the key-pressed position, the stop portion 509 comes into contact with the lower surface of the stop member 511 of the key guide mechanism 507, stopping the raising of the key 501. In other words, both the brake portion 509 and the brake element 511 are designed to form a lower limit stop.

The lower limit portion relative to the lower limit stopper can be used to determine the response to the key position when the key switch 506 is depressed and deformed by the actuator 513 . Or it is possible to provide a protrusion on the lower surface of the hinge portion 502 as a part of the lower limit stopper. In this case, the lower limit position can be determined when the protruding portion comes into contact with the key frame 505 or with the upper surface of the stop member 511 of the key guide mechanism 507 .

In FIG. 46 , an upper limit stopper 509 is formed as a part of the lower edge portion of the guided portion 508 . However, it is possible to form an upper limit detent that is closed to the guided portion 508 and place it in another position. Alternatively, the lower limit stopper can be omitted so that the function of the lower limit stopper can be solved by contacting the lower surface of the key 501 with the upper surface of the key guide mechanism 507 . In this case, a thin felt can be attached to the upper surface of the key guide 507 .

In the case of key operation (see arrow AA in FIG. 45), the key 501 rotates around the hinge portion 502, and is deflected downward by a predetermined stroke as shown by the chain line in FIG. During key operation, the guided portion 508 of the key 501 moves downward while sliding against both sides (ie, guide surfaces) of the guide portion of the key guide mechanism 507 fixed to the front edge portion of the key frame 505 . This makes it possible to avoid a lateral swing movement or to be associated with a downward deflection movement of the key 501 . According to this embodiment, the key guide mechanism 507 fixed to the end edge of the key frame 505 is formed in such a manner that the main part of the key guide mechanism 507 faces the key frame 505 downward. In addition, the protruding length of the key guiding mechanism 507 is the same as the lower edge of the guided portion 508 , and the lower edge of the guided portion 508 is below the key frame 505 when the key 501 is not depressed. In this way, it is possible to reduce the distance between the upper surface of the key 501 and the key frame 505 . The reason why the distance can be reduced by this embodiment will be described below.

Since the key down stroke must be provided for the key 501, if the key 507 protrudes upward from the key frame 505, the distance _L3 (see FIG. 45) is required to be at least the sum of the key down stroke and the upward protrusion. If this embodiment is designed such that a distance L ₁ is approximately equal to a distance L ₂ , it can be understood theoretically that the distance L ₃ can be reduced to at least the sum of a stroke distance L ₄ and the key upper wall thickness L ₅ . However, in practice, only the small thickness _L5 of the upper wall of the key 501 cannot withstand key pressure well. For this reason, to reinforce the key 501, side walls are provided for it. Therefore, the distance L ₃ is equal to the sum of the stroke distance L ₄ and the width L ₆ of the sidewall of the key 501 . In other words, if the width _L6 of the side wall of the key 501 can be reduced to a small width, the key 501 can also bear the key pressure with this width, and the distance _L3 is also reduced. As a result, the keyboard device according to this embodiment can be manufactured with a relatively small thickness.

Incidentally, the guide portion 510 of the key guide mechanism 507 can partially protrude above the key frame 505 with its downward protruding length reduced.

Finally, the invention as thus far described may be practiced or carried out in another way without departing from its spirit or essential characteristics. Accordingly, the preferred embodiments described herein are illustrative rather than limiting, the scope of the invention being indicated by the appended claims and variations included within the scope of the main claims being acceptable herein.

Claims (11)

1. A keyboard device for an electronic musical instrument, comprising: One-button shelf; A key, the fixed part of which is supported by the key frame, so that the front part of the key can freely rotate up and down; an actuator attached to the underside of said key; A key drop sensor has an elastic protrusion, said key drop sensor is arranged on said key frame, and is driven by said actuator, and when said key is pressed, said actuator presses said elastic protrusion part; and a guide member arranged at a predetermined position of the key frame; The keyboard device is characterized in that it further comprises: An assembly guide, cooperating with the guide member, is used to guide said key when said key is moved in the assembly direction so that said key and said key frame are assembled together, said key is formed in such a way Said assembly guide guides, ie, said actuator is out of contact with said key drop sensor during assembly operations. 2. A keyboard device for an electronic musical instrument according to claim 1, wherein said assembling guiding device comprises: a contact-avoiding member disposed below the key, the contact-avoiding member slides along the guide member when an assembling operation is performed so that the key and the key frame are assembled together, and the actuator is controlled not to contact the key-down sensor during said assembling operation by maintaining a certain distance between said actuator and said key-down sensor until said assembling operation is about to be completed. 3. A kind of keyboard device for electronic musical instrument according to claim 1, is characterized in that, described assembling guiding device comprises: an assembly guide member attached to the lower edge of said key and projecting downwardly from said key lower edge, said assembly guide member being used to assemble said key and said key frame together prior to an assembly operation This is done by adjusting the lateral movement of the actuator relative to the key drop sensor so that the key is oriented in its longitudinal direction when assembling the key to the keyframe, the assembly guide member providing A tapered portion to establish a predetermined positional relationship between said actuator and said key drop sensor when said key is guided by said assembly guide member. 4. A kind of keyboard device for electronic musical instrument according to claim 1, is characterized in that, described assembling guiding device comprises: An assembling guide member, which is provided on said key frame, said assembling guide member guides said key in such a manner as to perform an assembling operation between said key and key frame, that is, the fixing of said key The part is guided to drop in an approximately natural drop manner, and then the actuator contacts the upper surface of the key drop sensor. 5. A kind of keyboard device for electronic musical instrument according to claim 1, is characterized in that, described assembling guiding device comprises: a guided portion formed on the fixed portion of said key; and An assembly guide member, which is provided on said key frame, said assembly guide member interacts with said guided portion of said key so as to go in this way when performing an assembly operation between said key and key frame. The key is guided, that is, the fixed portion of the key is guided to drop in approximately a natural drop, and then the actuator contacts the upper surface of the key drop sensor. 6. A kind of keyboard device for electronic musical instrument as claimed in claim 5, it is characterized in that, said assembling guide member is a protrusion, and it protrudes upwards from said key frame, and its height is determined like this That is, the actuator is over the key drop sensor and away from the key drop sensor just before or after the protrusion engages the guided portion of the key. 7. A kind of keyboard device for electronic musical instrument as claimed in claim 5, it is characterized in that, said assembling guide member has the shape that protrudes upwards from said key frame, and said assembling guide member also supports the upper body The role of forming a part of the main body of the electronic musical instrument by virtue of being in contact with the lower surface of the upper body. 8. A keyboard device for an electronic musical instrument according to claim 4, wherein said fixed portion has a guided portion and a hole, and said guided portion is formed by said guided portion just before the assembling operation is completed. Guided by the guide member, the fixing portion then falls into the hole. 9. A keyboard device for an electronic musical instrument according to claim 5, wherein said fixing portion is formed with a hole adjacent to said guided portion when it is guided by said guide member , the fixed part falls into the hole. 10. A keyboard device for an electronic musical instrument according to claim 2, wherein said contact avoiding member is constituted by an extension of said actuator. 11. A keyboard device for an electronic musical instrument according to claim 2, wherein said contact avoiding member is formed separately from said actuator.

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