JP2018180073A - Structure and electronic musical instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure capable of supporting a member which may thermally expand or shrink without being affected by environmental temperature.SOLUTION: The structure comprises a first member having a plurality of openings arranged in a first direction and a second member supporting the first member. The second member includes a plurality of projections inserted into the openings. The openings have first openings and second openings disposed at a position farther away from a predetermined reference position of the first member than the first openings. The second opening has greater dimension in the first direction than that of the first opening in the first direction.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a structure and an electronic musical instrument.

  In general, an electronic keyboard instrument such as an electronic piano is provided with a key switch for detecting the movement of the key. The key switch includes a movable contact that moves up and down according to the movement of the key, and a fixed contact disposed below the movable contact. Since such key switches are arranged for each key, a plurality of fixed contacts are provided along the scale direction (the direction in which the keys are arranged). That is, under the key, a circuit board on which a plurality of fixed contacts are arranged is arranged along the scale direction. The circuit board is fixed to a frame supporting a key (Patent Document 1).

JP, 2016-82188, A

  In the electronic keyboard instrument, for example, 88 keys are arranged. Therefore, the length of the circuit board becomes longer according to the number of keys. Usually, since the circuit board is formed of a plate-like member made of a resin material such as epoxy resin, it slightly stretches or shrinks depending on the environmental temperature. Therefore, when fixing the circuit board to the frame supporting the key, it is desirable to consider the effects of thermal expansion and contraction of the circuit board.

  One of the problems of the present invention is to provide a structure capable of supporting a member capable of thermal expansion or thermal contraction without being influenced by the environmental temperature.

  An object of the present invention is to provide an electronic musical instrument capable of supporting a circuit board capable of thermal expansion or thermal contraction by a frame without being influenced by the environmental temperature.

  A structure according to an embodiment of the present invention includes a first member having a plurality of openings arranged in a first direction (for example, a longitudinal direction), and a second member supporting the first member. The second member has a plurality of projections inserted into the plurality of openings, and the plurality of openings are the first opening and the predetermined reference position of the first member. And a second opening at a position farther than the one opening, wherein the dimension in the first direction of the second opening is larger than the dimension in the first direction of the first opening.

  At this time, the predetermined reference position may be a positioning unit that determines the position of the first member in the first direction with respect to the second member. The predetermined reference position may be a center position of the first member in the first direction. Furthermore, the predetermined reference position may be a notch or a protrusion provided on a side portion of the first member along the first direction.

  The structure according to an embodiment of the present invention further includes a third member disposed so as to be sandwiched between the first member and the second member, and the projection of the second member is the third member. It may have an opening to be inserted.

  In the electronic musical instrument according to one embodiment of the present invention, in the above-described structure, the first member may be a circuit board on which an electronic circuit is disposed, and the second member may be a frame. At this time, the circuit board may have a plurality of first elements arranged in the first direction. The first direction may be a direction in which keys are arranged, that is, a scale direction.

  Further, the first member further includes a second element in which signals from the plurality of first elements are collected, and the second element is located closer to the first opening than the second opening. It may be. The second element may be in a position sandwiched by the first opening. As a specific example, the first element may be a sensor. The second element may be an integrated circuit.

  According to an embodiment of the present invention, it is possible to provide a structure capable of supporting a thermally expandable or thermally shrinkable member without being influenced by the environmental temperature.

  According to one embodiment of the present invention, it is possible to provide an electronic musical instrument capable of supporting a thermal expansion or thermal contraction circuit member by a frame without being influenced by the environmental temperature.

It is a figure which shows the structure of the keyboard apparatus of one Embodiment of this invention. It is a block diagram showing composition of a sound source device of one embodiment of the present invention. It is a figure which shows an example which looked at the structure inside the housing | casing of one Embodiment of this invention from the side. It is explanatory drawing at the time of seeing the structure inside the housing | casing in one Embodiment of this invention from a back surface (lower surface). It is a figure which shows an example of the circuit arrangement | positioning of the circuit board 400 in one Embodiment of this invention. It is a figure showing an example of composition of a circuit board in one embodiment of the present invention. It is a figure showing an example of composition of a circuit board in one embodiment of the present invention. It is a figure showing an example of composition of a circuit board in one embodiment of the present invention. It is a figure which shows an example of a structure of the movable contact in one Embodiment of this invention. It is a figure which shows the positional relationship of a flame | frame, a contact member, and a circuit board in, before mounting a circuit board with respect to a flame | frame. It is a figure which shows the positional relationship of a flame | frame, a contact member, and a circuit board after mounting a circuit board with respect to a flame | frame.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The embodiment shown below is an example of the embodiment of the present invention, and the present invention is not interpreted as being limited to these embodiments. In the drawings referred to in this embodiment, the same portions or portions having similar functions are denoted by the same reference numerals or similar reference numerals (reference numerals with A, B, etc. appended after numbers), and the repetition thereof The description of may be omitted. In addition, dimensional ratios (ratios between components, ratios in the vertical and horizontal directions, etc.) of the drawings may be different from actual ratios for convenience of explanation, or parts of the configurations may be omitted from the drawings.

First Embodiment
[Configuration of keyboard device]
FIG. 1 is a view showing the configuration of a keyboard device according to an embodiment of the present invention. In this example, the keyboard device 1 is an electronic keyboard instrument such as an electronic piano which is produced in response to a key depression of a user (performer). The keyboard device 1 may be a keyboard-type controller that outputs control data (for example, MIDI) for controlling an external sound source device according to a key depression. In this case, the keyboard device 1 may not have the sound source device.

  The keyboard device 1 includes a keyboard assembly 10. The keyboard assembly 10 includes a white key 100 w and a black key 100 b. A plurality of white keys 100 w and black keys 100 b are arranged side by side. The number of keys 100 is N, which is 88 in this example. The arranged direction (D1 direction in FIG. 1) is referred to as the scale direction. When the white key 100 w and the black key 100 b can be described without particular distinction, they may be referred to as the key 100. Also in the following description, when “w” is attached to the end of the code, it means that the configuration corresponds to the white key. Further, when “b” is added at the end of the code, it means that the configuration corresponds to the black key.

  A portion of the keyboard assembly 10 resides inside the housing 90. When the keyboard device 1 is viewed from above, a portion of the keyboard assembly 10 covered by the housing 90 is referred to as a non-appearance part NV, and a part exposed from the housing 90 and visible to the user is referred to as an appearance part PV. . That is, the appearance part PV is a part of the key 100 and indicates an area where the user can perform a play operation. Hereinafter, a portion of the key 100 exposed by the appearance portion PV may be referred to as a key main body.

  A sound source device 70 and a speaker 80 are disposed in the housing 90. The sound source device 70 generates a sound waveform signal in response to the depression of the key 100. The speaker 80 outputs the sound wave form signal generated in the sound source device 70 to the external space. The keyboard device 1 may be provided with a slider for controlling the volume, a switch for switching the timbre, a display for displaying various information, and the like.

  In the description of the present specification, the directions such as up, down, left, right, near and far indicate the directions when the keyboard device 1 is viewed from the player when playing. Therefore, it can be expressed, for example, that the non-appearance portion NV is located on the back side with respect to the appearance portion PV. Although the direction D1 shown in FIG. 1 can be expressed as the left-right direction, it may be expressed as the scale direction as described above. The direction D2 shown in FIG. 1 can be expressed as the front-rear direction.

  Also, the direction may be indicated with reference to the key 100, such as the front end side of the key and the rear end side of the key. In this case, the key front end side indicates the front side of the key 100 as viewed from the player. The rear end side of the key indicates the back side of the key 100 as viewed from the player. According to this definition, it can be expressed that the portion from the front end to the rear end of the key body portion of the black key 100b in the black key 100b is a portion projecting upward beyond the white key 100w.

  FIG. 2 is a block diagram showing the configuration of a sound source device according to an embodiment of the present invention. The sound source device 70 includes a signal conversion unit 710, a sound source unit 730, and an output unit 750. A plurality of sensors 300-1, 300-2, ..., 300-88 (hereinafter referred to simply as "sensor 300" when it is not necessary to distinguish them individually) are provided corresponding to each key 100. Detects the operation of the key and outputs a signal according to the detected content. In this example, the sensor 300 outputs a signal according to the three-step key depression amount. The key pressing speed can be detected according to the interval of this signal.

  The signal conversion unit 710 acquires an output signal of the sensor 300, and generates and outputs an operation signal according to the operation state of each key 100. In this example, the operation signal is a signal of MIDI format. Therefore, the signal conversion unit 710 outputs note-on in response to the key depression operation. At this time, the key number indicating which of the 88 keys 100 has been operated, and the velocity corresponding to the key depression speed are also output in association with the note-on. On the other hand, in response to the key release operation, the signal conversion unit 710 associates and outputs the key number and the note off. A signal corresponding to another operation such as a pedal may be input to the signal conversion unit 710, and may be reflected in the operation signal.

  The sound source unit 730 generates a sound waveform signal based on the operation signal output from the signal conversion unit 710. The output unit 750 outputs the sound waveform signal generated by the sound source unit 730. The sound wave type signal is output to, for example, the speaker 80 or a sound wave type signal output terminal.

[Configuration of keyboard assembly]
FIG. 3 is an explanatory view of the configuration inside the housing in the embodiment of the present invention as viewed from the side. As shown in FIG. 3, the keyboard assembly 10 and the speaker 80 are disposed inside the housing 90. The speaker 80 is disposed at the back of the keyboard assembly 10. The speaker 80 is arranged to output a sound corresponding to the key depression toward the upper and lower sides of the housing 90. The sound outputted downward travels from the lower surface side of the housing 90 to the outside. On the other hand, the sound outputted upward passes from the inside of the housing 90 through the space inside the keyboard assembly 10, and from the gap between the adjacent parts of the key 100 in the appearance part PV or the gap between the key 100 and the housing 90 Go to

  The configuration of the keyboard assembly 10 will be described with reference to FIG. The keyboard assembly 10 includes a connecting portion 180, a hammer assembly 200 and a frame 500 in addition to the key 100 described above. The keyboard assembly 10 is a resin-made structure, most of which are manufactured by injection molding or the like. The frame 500 is fixed to the housing 90.

  The connection unit 180 rotatably connects the key 100 to the frame 500. The connection portion 180 includes a plate-like flexible member 181, a key side support portion 183, and a rod-like flexible member 185. The flexible member 181 extends from the rear end of the key 100. The key side support portion 183 extends from the rear end of the flexible member 181. The flexible member 185 is a so-called snap fit, and connects the key side support portion 183 and the frame side support portion 585 of the frame 500. That is, the flexible member 185 is disposed between the key 100 and the frame 500. Flexure of the flexible member 185 allows the key 100 to pivot relative to the frame 500.

  The key 100 includes a front end key guide 151 and a side key guide 153. The front end key guide 151 slidably contacts the front end frame guide 511 of the frame 500. The front end key guide 151 is in contact with the front end frame guide 511 on both sides in the upper and lower scale directions. The side key guides 153 slidably contact the side frame guides 513 on both sides in the scale direction. In this example, the side surface key guide 153 is disposed in the region corresponding to the non-appearance portion NV in the side surface of the key 100, and exists on the key front end side with respect to the connection portion 180 (plate-like flexible member 181). , And may be disposed in the area corresponding to the appearance part PV.

  Hammer assembly 200 is pivotally attached to frame 500. At this time, the shaft support portion 220 of the hammer assembly 200 and the pivot shaft 520 of the frame 500 slidably contact at at least three points. The front end portion 210 of the hammer assembly 200 is slidably in contact with the internal space of the hammer support portion 120 in the generally longitudinal direction. The sliding portion, that is, the portion where the front end portion 210 and the hammer support portion 120 are in contact with each other is located below the key 100 in the outer appearance portion PV (forward of the rear end of the key body portion).

  In the hammer assembly 200, a metal weight portion 230 is disposed on the back side of the pivot shaft. In a normal state (when the key is not depressed), the weight portion 230 is placed on the lower stopper 250, and the front end portion 210 of the hammer assembly 200 pushes back the key 100. When the key is depressed, the weight portion 230 moves upward and collides with the upper stopper 260. The hammer assembly 200 applies a weight to the key depression by the weight portion 230. The lower stopper 250 and the upper stopper 260 are formed of a buffer material or the like (non-woven fabric, elastic body or the like).

  Below the hammer support portion 120 and the front end portion 210, a circuit board 400 for performing various signal processing is attached to the frame 500. The circuit board 400 is provided so as to be parallel to the mounting surface of the housing 90 in a sectional view.

  On the circuit board 400, a movable contact 212a provided with a conductor functioning as a contact is disposed on a support made of a resin material. The movable contacts 212 a are movable members provided with contacts, and a plurality of movable contacts 212 a are provided in the scale direction corresponding to the respective keys 100. The movable contact 212a is disposed to face the sensor 300 (not shown) of the circuit board 400 so as to be in contact with or separated from the sensor 300 (not shown). Here, when the movable contact 212a is pushed by the front end portion 210 of the hammer assembly 200 in response to the key depression operation of the key 100, the movable contact 212a is deformed and crushed. When the sensor 300 on the circuit board 400 detects contact with an electrode of the movable contact 212a, the sensor 300 outputs a detection signal to an integrated circuit 410 (FIG. 5) described later. As a result, the key depression operation of the key 100 is detected, and a note on is output from the signal conversion unit 710 shown in FIG.

[Frame and circuit board configuration]
FIG. 4 is an explanatory view when the configuration inside the housing in the embodiment of the present invention is viewed from the back surface (lower surface). Specifically, it corresponds to a plan view of the circuit board 400 and the frame 500 shown in FIG. 3 as viewed from below. Here, in particular, description will be given focusing on the configuration of the circuit board 400 and the frame 500 and the positional relationship between the two.

  First, the schematic configuration of the circuit board 400 will be described. In the keyboard device 1 of the present embodiment, the circuit board 400 is divided into three parts, a central circuit board 400C, a right circuit board 400R, and a left circuit board 400L. However, this is merely an example, and the number of divisions of the circuit board 400 is arbitrary, and it is also possible to configure with one board without dividing. In the present specification, the central circuit board 400C, the right circuit board 400R, and the left circuit board 400L may be collectively referred to as the circuit board 400 if it is not necessary to distinguish them.

  The circuit board 400 has a positioning portion 402 at a substantially central position in the scale direction (D1 direction) which is the longitudinal direction. Here, “almost center” is a concept including not only the center in a strict sense but also a range (near the center) that can be regarded as the center by those skilled in the art. In the present embodiment, a notch (recess) provided in the circuit board 400 is used as the positioning unit 402. As described later, the positioning portion 402 engages with the first positioning portion 544 of the front end support portion 540 to determine the position of the circuit board 400. However, the same function may be realized by providing a projection instead of the notch as the positioning part 402 and providing a notch as the first positioning part 544 instead of the projection. Alternatively, the circuit board 400 may be provided with an opening for positioning, and the same function may be realized by inserting a projection or the like protruding from the frame 500 or another member into the opening. In the present embodiment, an example is shown in which the position where the positioning portion 402 is disposed is set to a substantially central position in the scale direction of the circuit board 400, but the present invention is not limited thereto.

  The circuit board 400 also has openings 404 and 406. The openings 404 are arranged along the scale direction (direction D1) on the rear end side of the circuit board 400, that is, in the vicinity of a rear end support 530 described later. The openings 406 are disposed along the scale direction closer to the front end side of the circuit board 400 than the openings 404. The openings 404 and 406 are disposed at positions overlapping with a first rib 550 and a second rib 552 described later. Further, in the present embodiment, the number of the openings 406 is smaller than the number of the openings 404. However, the present invention is not limited to this, and the openings 406 can be arranged in any number according to the circuit layout of the circuit board 400. The shape of the openings 404 and 406 is not limited to a circle, but may be any shape such as an ellipse, a rectangle, or a square having rounded corners. Details of the openings 404 and 406 will be described later.

  Here, the circuit arrangement of the circuit board 400 will be described with reference to FIG. FIG. 5 is a diagram showing an example of the circuit arrangement of the circuit board 400 in the embodiment of the present invention. As shown in FIG. 5, the central circuit board 400C, the right circuit board 400R, and the left circuit board 400L have sensors 300 arranged along the scale direction (direction D1). In addition, central circuit board 400C has integrated circuit 410 near the longitudinal center that processes the signal collected from sensor 300. However, the integrated circuit 410 may be located not only near the longitudinal center but also near the longitudinal end. The central circuit board 400C is electrically connected to the left circuit board 400L and the right circuit board 400R through the connector 420L and the connector 420R.

  Among the circuit boards 400, the central circuit board 400C is a board mainly responsible for signal processing and sensing processing. The right circuit board 400R and the left circuit board 400L are mainly boards that are responsible for the sensing process. Here, the sensing process is a process of detecting a key depression operation of the key 100. The sensing process is performed by the sensor 300 provided for each key. In this example, the sensor 300 is a fixed contact composed of a wiring pattern disposed on the circuit board 400, and detects contact or separation of a conductor (electrode) of the movable contact 212a (FIG. 3).

  In addition, although the fixed contact was mentioned as an example of the sensor 300, you may use the combination of a fixed contact and a movable contact as the sensor 300 here. The number of fixed contacts is not limited to one, and may be plural. For example, a plurality of fixed contacts may be arranged corresponding to one key, and the presence or absence of key depression, key depression speed, etc. may be detected using them. Furthermore, not only a contact detection sensor that detects contact or separation, but also a non-contact detection sensor such as an optical sensor or an electrostatic sensor that detects proximity or separation of an object may be used as the sensor 300.

  Further, the signal processing referred to here is processing for processing the detection signals collected from the sensor 300 to generate operation signals according to the operation state of each key 100. Signal processing is performed by integrated circuit 410 disposed on central circuit board 400C. The block diagram of the signal processing performed by the integrated circuit 410 corresponds to the signal conversion unit 710 in FIG.

  Although illustration is omitted, each of the individual sensors 300-m (where m is a natural number) is electrically connected to the integrated circuit 410 through a plurality of wires formed on the circuit board 400. . That is, detection signals output from the sensor 300 disposed on the left circuit board 400L and the sensor 300 disposed on the right circuit board 400R are transmitted to the central circuit board 400C through the connector portions 420L and 420R, respectively, and integrated circuit It is configured to be collected at 410.

  In the present embodiment, the widths of the right circuit board 400R and the left circuit board 400L in the front-rear direction (D2 direction) are narrower than the width of the central circuit board 400C in the front-rear direction. This is because, as described above, as a result of integrating the functions of signal processing in the central circuit board 400C, it is possible to miniaturize the right circuit board 400R and the left circuit board 400L. However, the widths of the central circuit board 400C, the right circuit board 400R, and the left circuit board 400L in the front-rear direction may be the same.

  Next, referring back to FIG. 4, a schematic configuration of the frame 500 will be described. The frame 500 includes a rear end support 530 supporting the rear end of the circuit board 400, a front end support 540 supporting the front end of the circuit board 400, a first rib 550, and a second rib 552. The front end support portion 540 includes a front end support portion 540C for supporting the front end of the central circuit board 400C, a front end support portion 540R for supporting the front end of the right circuit board 400R, and a front end support portion 540L for supporting the front end of the left circuit board 400L. including. In the present specification, the front end support portion 540R and the front end support portion 540L supporting the front end of the left circuit board 400L are collectively referred to as the front end support portion 540 unless it is particularly necessary to distinguish.

  The first rib 550 and the second rib 552 are provided to increase the strength of the frame 500, and are integrally formed with the rear end support portion 530 and the front end support portion 540. Specifically, the first rib 550 is disposed at the position of the boss 532 provided on the rear end support portion 530, and reinforces the frame 500 toward the rear end side of the hammer assembly 200 (not shown). The boss 532 is used to fix the housing 90 and the frame 500 shown in FIG. The second rib 552 is disposed across the rear end support portion 530 and the front end support portion 540, and a part of the second rib 552 overlaps the circuit board 400 in a plan view. Although not shown in FIG. 4, the hammer assembly 200 shown in FIG. 3 is individually disposed between two adjacent second ribs 552.

  Rod-shaped (pin-shaped) protrusions 554 and 556 are provided on the first rib 550 and the second rib 552, respectively. When the circuit board 400 is attached to the frame 500, the protrusions 554 and 556 are disposed at positions overlapping with the openings 404 and 406 of the circuit board 400, respectively. That is, when the circuit board 400 is attached to the frame 500, the protrusions 554 and 556 are inserted into the openings 404 and 406 of the circuit board 400, respectively.

  In the keyboard device 1 of the present embodiment, the rear end support 530 aligns and supports the rear ends (ends on the rear side) of the central circuit board 400C, the right circuit board 400R, and the left circuit board 400L. In other words, the rear end support portion 530 is configured to support the rear ends of the right circuit board 400R and the left circuit board 400L on the same line or on the same plane. By arranging the central circuit board 400C, the right side circuit board 400R and the left side circuit board 400L as shown in FIG. 4, the width of the front end support portions 540R and 540L in the front-rear direction (direction D2) can be increased. The side strength can be further improved.

  The rear end support portion 530 includes a support portion 534 for preventing the circuit board 400 from falling off and a positioning portion 536 for determining the position of the circuit board 400 in the front-rear direction (D2 direction), in addition to the boss 532. In the present embodiment, the support portion 534 is configured by a so-called snap fit, but is not limited thereto. The positioning portion 536 is composed of a protrusion having a curved surface facing the front end support portion 540. As described later, the positioning unit 536 has a function of positioning the circuit board 400 in the front-rear direction (D2 direction).

  The front end support portion 540 is a support portion 542 for preventing the circuit board 400 from falling off, a first positioning portion 544 for determining the position of the circuit board 400 in the scale direction (D1 direction), and the front and back direction (D2 direction) of the circuit board 400 And a second positioning unit 546 for determining the position of The support portion 542 is disposed at a position spaced apart from the second rib 552 in the vertical direction (the height direction of the keyboard device 1). The circuit board 400 is supported with its front end sandwiched between the second rib 552 and the support portion 542.

  In addition, the first positioning portion 544 is configured by a protrusion that protrudes toward the rear end support portion 530. Basically, it is preferable to match the position where the first positioning portion 544 is provided with the center position of the circuit board 400 in the scale direction (direction D1), but the present invention is not limited to this. It does not matter. The second positioning portion 546 abuts on the front end of the circuit board 400 and plays a role of preventing movement of the circuit board 400 to the front side (player side).

  In mounting the circuit board 400 on the frame 500, first, the front end of the circuit board 400 is inserted between the second rib 552 and the support portion 542 of the front end support portion 540. At this time, the position of the first positioning portion 544 in the front end support portion 540 and the position of the positioning portion 402 provided on the front end of the circuit board 400 are matched.

  Next, the rear end side of the circuit board 400 is pushed toward the second rib 552. When the circuit board 400 moves to a predetermined position, the circuit board 400 is supported by the function of the support portion 534 in the rear end support portion 530. At that time, the rear end of the circuit board 400 is pushed forward by sliding along the curved surface of the positioning portion 536 of the rear end support portion 530. Then, when the front end of the circuit board 400 abuts on the second positioning portion 546 of the front end support portion 540, the position of the circuit board 400 in the front-rear direction is determined.

[Configuration of opening in circuit board]
Next, the configuration of the opening in the circuit board 400 will be described with reference to FIG. FIG. 6 is a view showing an example of the configuration of a circuit board in an embodiment of the present invention. In particular, FIG. 6 is a diagram for describing the configuration of the openings 404 and 406 in the circuit board 400. Here, for convenience of explanation, although the central circuit board 400C among the circuit boards 400 is described as an example, the left side circuit board 400L and the right side circuit board 400R each have the same configuration.

  As shown in FIG. 6, a plurality of openings 404 are arranged in the vicinity of the rear end of the central circuit board 400C along the scale direction (direction D1). In the present embodiment, the dimension in the longitudinal direction of the opening 404, that is, the scale direction (D1 direction) changes in accordance with the position where the opening 404 is disposed. Specifically, the dimension in the scale direction of the opening 404 becomes larger as it approaches the end in the scale direction of the central circuit board 400C.

  FIG. 6 shows an enlarged view of a region surrounded by the frame lines 45a, 45b and 45c in addition to the central circuit board 400C. Of the openings 404, the dimensions in the D1 direction of the openings 404a, 404b and 404c are X1, X2 and X3, respectively, and the dimensions in the D2 direction are Y1, Y2 and Y3. The opening 404b is disposed at a position farther from the predetermined reference position (specifically, the positioning portion 402) of the central circuit board 400C than the opening 404a, and the opening 404c is arranged at the predetermined reference position. It is disposed at a position farther than the opening 404b. That is, in FIG. 6, the opening 404a, the opening 404b, and the opening 404c are closer to the end in the scale direction of the central circuit board 400C in the order.

  At this time, there is a relation of X3> X2> X1 among X1, X2 and X3 in the central circuit board 400C of the present embodiment. That is, the dimension in the D1 direction of the opening 404b is larger than the dimension in the D1 direction of the opening 404a, and the dimension in the D1 direction of the opening 404c is larger than the dimension in the D1 direction of the opening 404b.

  Moreover, in the present embodiment, Y1, Y2, and Y3 also have a relationship of Y3> Y2> Y1. That is, the dimension in the D2 direction of the opening 404b is larger than the dimension in the D2 direction of the opening 404a, and the dimension in the D2 direction of the opening 404c is larger than the dimension in the D2 direction of the opening 404b.

  Since the frame 500 and the central circuit board 400C are made of different materials, their thermal expansion coefficients are also different. Therefore, when the environmental temperature changes, the central circuit board 400C expands and contracts relatively to the frame 500 due to the difference in the thermal expansion coefficient. At this time, when the position of the opening 404 in the central circuit board 400C described above deviates from the position of the protrusion 554 provided on the first rib 550 and the second rib 552, the central circuit board 400C is detached from the frame 500. There is a risk that problems such as failure to do so may occur. In particular, in the central circuit board 400C whose longitudinal direction is the scale direction, the amount of expansion and contraction due to the difference in the thermal expansion coefficient becomes larger as it is closer to the end in the scale direction. Therefore, the problem of the positional deviation between the opening 404 and the projection 554 becomes more remarkable as it is closer to the end in the scale direction.

  In the present embodiment, in consideration of the difference in thermal expansion coefficient between the frame 500 and the central circuit board 400C, a configuration is adopted in which the dimension of the opening 404 is increased closer to the end in the scale direction of the central circuit board 400C. Therefore, since the dimension of the opening 404 in the scale direction has a margin as it gets closer to the end of the central circuit board 400C, even if the central circuit board 400C stretches or contracts, the above-mentioned problem of misalignment does not occur.

  It is sufficient for the dimensions of all the openings 404 to have the same configuration as that of the opening 404b shown in FIG. 6 as long as the expansion and contraction of the central circuit board 400C is merely coped with. However, on the central circuit board 400C, various elements such as the sensor 300 and the integrated circuit 410 are disposed and many wirings are formed. Therefore, when the size of the opening 404 is increased, the central circuit board 400C may be increased in size. In that respect, according to the present embodiment, by making the size of the opening 404 different as necessary, it is possible to prevent the above-mentioned problem of positional deviation while preventing the central circuit board 400C from being enlarged. It is.

  In addition, expansion and contraction of the central circuit board 400C occur symmetrically with respect to the central position in the scale direction. That is, assuming that the positioning portion 402 of the central circuit board 400C is at the center position in the scale direction, basically the same amount of expansion and contraction occurs on the left and right sides with respect to the positioning portion 402. Therefore, in the present embodiment, the structure is laterally symmetrical in the scale direction with reference to the positioning unit 402.

  FIG. 6 shows an enlarged view of a region further surrounded by frame lines 45d, 45e and 45e, respectively. In the present embodiment, in the openings 404, the dimensions in the D1 direction of the openings 404d, 404e and 404f are X1, X2 and X3, respectively, and the dimensions in the D2 direction are Y1, Y2 and Y3. In the central circuit board 400C of the present embodiment, the openings 404d, 404e and 404f are respectively symmetrical to the openings 404a, 404b and 404c with respect to a predetermined reference position (specifically, the positioning unit 402). It is placed in position. That is, the relationships X3> X2> X1 and Y3> Y2> Y1 described for the openings 404a to 404c are established between the openings 404d, 404e and 404f.

  As described above, in the central circuit board 400C of the present embodiment, the dimension in the scale direction of the opening 404 is symmetrical with respect to the positioning portion 402. As a result, even if the central circuit board 400C expands and contracts in both the left and right directions from the central position, the above-mentioned problem of misalignment can be reduced. However, it is not an essential configuration that the arrangement and the shape of the openings 404 are symmetrical in the scale direction with reference to the positioning unit 402. That is, even if the positional relationship between the central circuit board 400C and the central circuit board 400C is not symmetrical, the size of the opening 404 can be increased as it approaches the end in the scale direction of the central circuit board 400C.

  In the central circuit board 400C of this embodiment, the integrated circuit 410 is disposed in the vicinity of the positioning unit 402. This is because the amount of expansion and contraction due to heat is smaller as it is closer to the center position in the longitudinal direction of the central circuit board 400C. As a result, the integrated circuit 410 is disposed closer to the opening 404a (or the opening 404d) than the openings 404b and 404c (or the openings 404e and 404f). Further, since the openings 404 are arranged symmetrically with respect to the center position in the longitudinal direction (scale direction) of the central circuit board 400C, the integrated circuit 410 is sandwiched between the openings 404a and 404d. Placed in the

  Incidentally, although FIG. 6 shows an example designed to satisfy the relationship of Y3> Y2> Y1 in consideration of the expansion and contraction of the central circuit board 400C in the front-rear direction (D2 direction), the invention is not limited thereto. It is good also as Y3 = Y2 = Y1. That is, the dimensions of the openings 404 in the front-rear direction may be the same. The amount of expansion and contraction of the opening 404 in the front-rear direction can be said to be negligibly small compared to that in the scale direction.

  Also, although the configuration of the opening 404 has been described so far, the configuration is the same for the opening 406 as well. That is, although not shown, the central circuit board 400C has a dimension in the D1 direction of the opening 406 larger as it goes away from a predetermined reference position (for example, the positioning portion 402) in the D1 direction. In the central circuit board 400C of the present embodiment, the openings 404 and the openings 406 play the same role, and therefore, taking into account the expansion and contraction of the central circuit board 400C, the dimensions increase with distance from the predetermined reference position. It is preferable to do.

  As described above, in the keyboard device 1 of the present embodiment, the openings 404 and 406 arranged on the circuit board 400 are arranged at positions relatively away from the predetermined reference position of the circuit board 400. The dimensions in the scale direction are made larger by portions 404 and 406. Thereby, even if the circuit board 400 expands and contracts with respect to the frame 500, positional deviation between the openings 404 and 406 and the protrusions 554 and 556 of the frame 500 can be prevented. Accordingly, it is possible to provide the keyboard device 1 capable of supporting the long circuit board 400 in the scale direction without being influenced by the environmental temperature.

Second Embodiment
In the first embodiment, with regard to the openings 404 disposed in the circuit board 400, the dimension in the scale direction is increased as the openings 404 are disposed at positions relatively away from the predetermined reference position of the circuit board 400. Explained. In the second embodiment, an example of the specific mode will be described with reference to FIG.

  FIG. 7 is a view showing an example of the configuration of a circuit board in an embodiment of the present invention. Although the central circuit board 400C among the circuit boards 400 is described as an example for convenience of explanation, the left side circuit board 400L and the right side circuit board 400R have the same configuration. The configuration other than the configuration of the opening 404 is the same as that of the circuit board 400 described in the first embodiment, and thus the description thereof is omitted here.

  In FIG. 7, the openings 404 disposed in the central circuit board 400C are continuously opened as they are disposed at a position relatively away from a predetermined reference position (for example, the positioning portion 402) of the central circuit board 400C. The example which enlarges the dimension of the scale direction of the part 404 is shown. Of the openings 404, the dimensions in the D1 direction of the four openings 404ha, 404hb, 404hc, and 404hd surrounded by the frame 45h are M1, M2, M3, and M4, respectively. Here, the dimensions in the D2 direction are the same.

  At this time, the openings 404ha to 404hd are arranged at positions away from a predetermined reference position (specifically, the positioning portion 402) of the central circuit board 400C in order from the opening 404ha. Further, a relationship of M4> M3> M2> M1 is established between the dimensions of the openings 404ha to 404hd. That is, in the central circuit board 400C shown in FIG. 7, the dimension in the scale direction (direction D1) between the adjacent openings 404 is continuously set larger as it goes away from the predetermined reference position.

  As described above, in the embodiment illustrated in FIG. 7, the dimension in the scale direction of the opening 404 is continuously increased as the distance from the predetermined reference position of the circuit board 400 is relatively increased. Thus, the size in the scale direction of the opening 404 can be gradually increased in accordance with the amount of expansion and contraction of the circuit board 400 that continuously changes in the scale direction, and the opening is a minimum size necessary for the position. The part 404 can be arranged.

Third Embodiment
In the first embodiment, with regard to the openings 404 disposed in the circuit board 400, the dimension in the scale direction is increased as the openings 404 are disposed at positions relatively away from the predetermined reference position of the circuit board 400. Explained. In the third embodiment, an example of the specific mode will be described with reference to FIG.

  FIG. 8 is a view showing an example of the configuration of a circuit board in an embodiment of the present invention. Although the central circuit board 400C among the circuit boards 400 is described as an example for convenience of explanation, the left side circuit board 400L and the right side circuit board 400R have the same configuration. The configuration other than the configuration of the opening 404 is the same as that of the circuit board 400 described in the first embodiment, and thus the description thereof is omitted here.

  In FIG. 8, the openings 404 disposed in the central circuit board 400C are gradually opened as they are disposed at positions relatively away from a predetermined reference position (for example, the positioning portion 402) of the central circuit board 400C. The example which enlarges the dimension of the scale direction of the part 404 is shown. Of the openings 404, the dimensions in the D1 direction of the four openings 404ia, 404ib, 404ic and 404id surrounded by the frame line 45i are N1, N2, N3 and N4, respectively. Here, the dimensions in the D2 direction are the same.

  At this time, the openings 404ia to 404id are disposed at positions away from a predetermined reference position (specifically, the positioning portion 402) of the central circuit board 400C in order from the opening 404ia. Further, the relationship of N4 = N3> N2 = N1 is established between the dimensions of the openings 404ia to 404id. That is, in the central circuit board 400C shown in FIG. 8, the dimension in the scale direction (direction D1) between the adjacent openings 404 is set to be gradually larger as it goes away from the predetermined reference position.

  In other words, in the present embodiment, a plurality of openings 404 having the same dimension in the scale direction is set as one group, and a plurality of such groups are provided. In addition, each group has the feature that the dimension in the scale direction increases as the center circuit substrate 400C moves away from the predetermined reference position. Although it is optional how many openings 404 are included in one group, it is preferable to fit within 2 to 5 in order to match changes in the amount of expansion and contraction of the central circuit board 400C.

  As described above, in the embodiment shown in FIG. 8, the size in the scale direction of the opening 404 is gradually increased as the distance from the predetermined reference position of the circuit board 400 is relatively increased. Thus, the size in the scale direction of the opening 404 can be increased in accordance with the amount of expansion and contraction of the circuit board 400 which continuously changes in the scale direction, and the opening 404 can be minimized according to the position. Can be placed.

Fourth Embodiment
In the first embodiment, it has been described that the movable contact 212 made of a resin material is provided on the circuit board 400 (FIG. 3). In the fourth embodiment, an arrangement example of the movable contact 212 will be described with reference to FIGS. 9A to 9C, FIG. 10, and FIGS. 11A and 11B. In the present embodiment, description will be made focusing on the difference in configuration from the first embodiment, and the same configuration will be assigned the same reference numerals and descriptions thereof will be omitted.

  FIG. 9A to FIG. 9C are diagrams showing an example of the configuration of the movable contact in the embodiment of the present invention. Specifically, FIG. 9A is a plan view of a member including the movable contact 212a. FIG. 9B corresponds to a view obtained by cutting the plan view shown in FIG. 9A along dashed dotted line A-A ′. Further, FIG. 9C corresponds to a view obtained by cutting the plan view shown in FIG. 9A by an alternate long and short dash line B-B '.

  In FIG. 9A to FIG. 9C, the plurality of movable contacts 212a are respectively connected by a support member 212b, and constitute one component (hereinafter referred to as "contact member 212") as a whole. In the present embodiment, the support member 212b is made of the same resin material as that of the movable contact 212a. The plurality of movable contacts 212a are arranged in the scale direction (D1 direction) with respect to the support member 212b having the longitudinal direction in the scale direction (D1 direction).

  At this time, the support member 212b is provided with a plurality of openings 213a and 213b. Specifically, the opening 213a is provided on the side of the rear end and the opening 213b is provided on the side of the front end in the front-rear direction (direction D2) in the region between the adjacent movable contacts 212a. Here, the positions where the openings 213a and 213b are disposed correspond to the positions of the protrusions 554 and 556 provided on the first rib 550 or the second rib 552 of the frame 500, respectively. Specifically, the openings 213a and the openings 213b are arranged in the scale direction (direction D1).

  FIG. 10 is a view showing the positional relationship between the frame 500, the contact members 212, and the circuit board 400 before the circuit board 400 is mounted on the frame 500. As shown in FIG. As shown in FIG. 10, the contact member 212 is disposed between the frame 500 and the circuit board 400. That is, when attaching the circuit board 400 to the frame 500, the contact member 212 is sandwiched between the frame 500 and the circuit board 400. The arrow indicated by a broken line indicates that the projection 554 provided on the second rib 552 penetrates the opening 213 a of the contact member 212 and the opening 404 of the circuit board 400.

  FIGS. 11A and 11B are views showing the positional relationship between the frame 500, the contact member 212, and the circuit board 400 after the circuit board 400 is mounted on the frame 500, respectively. As shown in FIGS. 11A and 11B, the contact member 212 is held between the frame 500 and the circuit board 400 in a sandwiched state.

  At this time, the movable contact 212a is disposed so as to fit between adjacent ribs (here, between adjacent second ribs 552). That is, in the scale direction (D1 direction), the movable contact 212a is disposed in line with the second rib 552. At this time, as shown in FIG. 3, the movable contact 212 a is disposed below the front end 210 of the hammer assembly 200. Then, the front end portion 210 moves up and down between the second ribs 552 according to the key depression operation of the key 100, and abuts on the movable contact 212a to be deformed. As a result, the movable contact 212a and the sensor 300 (that is, the fixed contact) provided on the lower circuit board 400 come into contact with each other to detect the key pressing operation of the key 100.

  Further, when mounting the frame 500 and the circuit board 400, the bar-like (pin-like) protrusions 554 provided on the second rib 552 are the openings 213 a and 213 b of the contact member 212 and the opening 404 of the circuit board 400. And 406. Thereby, the position of the contact member 212 with respect to the frame 500 can be determined.

  Although the second rib 552, which is a part of the frame 500, is mainly described here, the same applies to the protrusions 554 and 556 provided on the first rib 550.

  As described above, in the present embodiment, the protrusions 554 and 556 used when mounting the circuit board 400 to the frame 500 are used as members for fixing the contact member 212 in a predetermined position. it can. At that time, as described in the first to third embodiments, the openings 404 and 406 of the circuit board 400 are provided in consideration of expansion and contraction due to heat of the circuit board 400, so Thus, the contact member 212 can be stably fixed.

  As mentioned above, although each embodiment was described taking the keyboard apparatus as an example, the present invention is not limited to this. That is, as long as the device includes a structure having a structure in which a certain member (first member) is supported by another member (second member), the present invention is also applicable to devices other than the keyboard device. For example, the present invention may be applied to an electronic musical instrument including a structure having a circuit board provided with a touch detection type sensor for detecting the movement of a manipulator and a support member for supporting the circuit board. In each of the above-described embodiments, the configuration in which the circuit board is supported by the frame has been described in the case of the keyboard device. However, the present invention is applicable to other parts of the keyboard device. .

  In addition, based on the configuration described as the embodiment of the present invention, those in which a person skilled in the art appropriately adds, deletes or changes the design of components or those in which steps are added, omitted or change conditions also As long as the gist of the present invention is included, it is included in the scope of the present invention.

  In addition, even if other effects or effects different from the effects brought about by the aspects of the embodiment described above are apparent from the description of the present specification, or those which can be easily predicted by those skilled in the art, it is natural. It is understood that the present invention provides the

  DESCRIPTION OF SYMBOLS 1 ... keyboard apparatus, 10 ... keyboard assembly, 70 ... sound source apparatus, 80 ... speaker, 90 ... housing | casing, 100 ... key, 120 ... hammer support part, 180 ... connection part, 181 ... flexible member, 181 ... plate shape Flexible member 185 flexible member 185 rod-like flexible member 200 hammer assembly 210 front end portion 212 contact member 212a movable contact 212b support member 213a, 213b ... opening portion 220 shaft supporting portion 230 weight portion 250 lower stopper 260 upper stopper 300 sensor 400 circuit board 400C central circuit board 400L left circuit board 400R right side Circuit board, 402: positioning part, 404, 406: opening part, 410: integrated circuit, 420L: connector part, 420R: connector part, 500: frame, 511: front Frame guide 513: side frame guide 520: pivot shaft 530: rear end support portion 532: boss 534: support portion 536: positioning portion 540: front end support portion 540C: front end support portion 540L: Front end support portion, 540R: Front end support portion, 542: Support portion, 544: First positioning portion, 546: Second positioning portion, 550: First rib, 552: Second rib, 554, 556: Projection portion, 585 ... Frame side support part 710 signal conversion part 730 sound source part 750 output part

Claims (11)

A first member having a plurality of openings arranged in a first direction;
A second member supporting the first member;
Equipped with
The second member has a plurality of protrusions inserted into the plurality of openings,
The plurality of openings have a first opening and a second opening at a position farther from the predetermined reference position of the first member than the first opening.
The dimension of the said 1st direction of the said 2nd opening part is a structure which is larger than the dimension of the said 1st direction of the said 1st opening part.   The structure according to claim 1, wherein the first member is a member different in material from the second member.   The structure according to claim 1, wherein the predetermined reference position is a positioning unit that determines a position of the first member in the first direction with respect to the second member.   The structure according to any one of claims 1 to 3, wherein the predetermined reference position is a substantially central position in the first direction of the first member. It has a structure according to any one of claims 1 to 4,
The electronic musical instrument, wherein the first member is a circuit board on which an electronic circuit is disposed.   The electronic musical instrument according to claim 5, wherein the second member is a frame.   The electronic musical instrument according to claim 5, wherein the circuit board has a plurality of first elements arranged in the first direction. The first member further includes a second element electrically connected to the plurality of first elements,
The electronic musical instrument according to claim 7, wherein the second element is located closer to the first opening than the second opening.   The electronic musical instrument according to claim 8, wherein the second element is disposed near the predetermined reference position.   The electronic musical instrument according to claim 8, wherein the first element is a sensor, and the second element is an integrated circuit.   The electronic musical instrument according to any one of claims 5 to 10, wherein the first direction is a scale direction.

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