JPH0915675A - Camera aperture control device - Google Patents

Abstract

(57) [Summary] [Problem] An error between a set aperture value and an aperture becomes large, and fine adjustment of the aperture cannot be performed. A plurality of diaphragm blades (11 to 15), a connecting member (10) that connects the diaphragm blades to each other so that the diaphragm blades can be opened and closed, and a driving unit that moves the connecting member to open and close the diaphragm blades. In the camera diaphragm control device, the driving means is screwed to the driving source (1 to 5), the screw member 8 rotationally driven by the driving source, and the screw member, and the screw member is rotated to rotate the screw member. And a moving member 9 for moving the connecting member in the axial direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for automatically controlling an aperture of a camera.

[0002]

2. Description of the Related Art A diaphragm mechanism of a camera includes a plurality of diaphragm blades arranged around an optical axis of a lens barrel so as to be openably and closably connected by a ring-shaped connecting member. In this case, by rotating the connecting member and opening and closing each aperture blade by the cam groove formed in the connecting member, a desired aperture can be obtained. And, for example, a. JP-A-57-165825,
b. JP-A-53-37745 and c. JP 2
As shown in Japanese Patent Laid-Open No. 168240, there has been conventionally proposed a device in which a connecting member is driven by a driving force of a driving source such as a step motor and the diaphragm aperture can be automatically controlled according to the brightness of a subject.

Here, in the diaphragm device proposed in the above publications a and b, a stator member arranged over the entire circumference of the lens barrel of the taking lens and a ring-shaped rotor rotating with respect to this stator member. A step motor composed of (output member) is used.

Further, the diaphragm device proposed in the above-mentioned publication has a pair of stator members each having a substantially U-shaped portion around which a coil is wound, and the openings of the portions are arranged to face each other. And a step motor including an output member (output shaft) arranged between these stator members is arranged in a part of the lens barrel in the circumferential direction. In such a step motor, since the ring-shaped rotor is not used, the thickness of the lens barrel can be made thinner than that of the proposals of the publications a and b.

[0005]

However, in the devices proposed by the above publications, the connecting member is directly driven by the output member of the step motor. For this reason,
There is a problem that the minimum rotation amount of the connecting member corresponding to the operation of one step of the step motor becomes large, and it is difficult to finely adjust the aperture opening.

If the transmission ratio (gear ratio) between the output member of the step motor and the connecting member is increased, or if a reduction gear train is arranged between the output member and the connecting member, the aperture opening is reduced. It is possible to reduce the minimum adjustment amount of. However, according to the former method, there is a problem that the diameter of the gear portion of the connecting member has to be increased, which causes an unreasonable strength and dimension, and the latter method causes backlash in the reduction gear train. There is a problem that due to the rattling that occurs, the error between the rotational position of the output member, that is, the aperture value set on the camera side and the actual aperture opening tends to become large.

Further, the relationship between the operation amount of the step motor and the size of the obtained diaphragm opening differs depending on the diaphragm mechanism due to the dimensional error of each component constituting the diaphragm mechanism, the variation of the characteristics of the step motor, and the like. Therefore, when assembling the diaphragm mechanism, it is necessary to perform an adjusting operation for obtaining an accurate diaphragm opening corresponding to the set aperture value, but such adjusting operation is preferably as simple as possible. .

Therefore, a first object of the present invention is to provide an aperture control device for a camera, in which the error between the set aperture value and the aperture opening is minimized and the fine adjustment of the aperture opening can be easily performed. It is in.

A second object of the present invention is to provide an aperture control device for a camera, which facilitates adjustment work when assembling the device.

[0010]

In order to achieve the above object, in the first invention of the present application, a plurality of diaphragm blades, a connecting member for connecting the diaphragm blades so as to be openable and closable, and the connecting member are moved. In a diaphragm control device for a camera having a driving means for opening and closing the diaphragm blade, the driving means is screwed to the driving source, a screw member rotated by the driving source, and the screw member. The screw member rotates to move in the axial direction of the screw member to move the connecting member.

According to such an aperture control device, since the minimum operation amount of the drive source (the operation amount for one step of the step motor) is converted into a minute operation amount via the screw member and the moving means, the aperture is controlled. It facilitates fine adjustment of the opening. Moreover, since the mechanism including the screw member and the moving unit has less rattling compared to the gear train, the error between the set aperture value and the actual aperture can be reduced.

The above-mentioned drive means is composed of a first drive source for moving the connecting member, a second drive source (or a manually operable operation member), and this second drive source (or operation member). A screw member that is rotationally driven, and a stop member that is screwed onto the screw member and that moves in the axial direction of the screw member by rotation of the screw member and that stops the connecting member that is moved by the first drive source. You may.

In such an aperture control device, the connecting member is directly driven by the first drive source, while the connecting member drives the connecting force of the second drive source (or the operating member) similarly to the above-mentioned device. Is stopped by a stop member capable of minute movement. This facilitates fine adjustment of the aperture opening.

As the step motor, a pair of stator members are provided, each having a substantially U-shaped portion around which a coil is wound, and the openings of the substantially U-shaped portion are arranged to face each other, and these stators. An output member disposed between the members is used.The step motor is disposed in a part of the circumference of the lens barrel of the taking lens, and the output member is extended in parallel with the optical axis of the lens barrel. Alternatively, the screw member may be extended in parallel with a surface orthogonal to the optical axis, and a rotation transmitting means for transmitting the rotation of the output member to the screw member may be provided.

According to such an aperture control device, it is possible to reduce the thickness of the lens barrel, and it is possible to finely adjust the aperture with a compact structure as a whole.

Further, in addition to the first invention, the second invention of the present application forms an aperture setting means for setting an aperture value and an aperture opening corresponding to the aperture value set by the aperture setting means in the aperture blade. A diaphragm control device is configured by providing a storage unit (for example, a non-volatile memory such as an EEPROM) that stores control data of a driving source (or a second driving source) to be driven.

According to such an aperture control device, it is possible to store the control data adjusted so that the set aperture value and the aperture opening coincide with each other at the time of assembly. Therefore, if the drive source (or the second drive source) is controlled based on this data when the camera is used, proper shooting can be performed without being affected by variations in the characteristics of the device.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) FIGS. 1 to 4 show a diaphragm control device according to a first embodiment of the present invention, and FIG. 1 is a perspective view showing a relationship between main components of the diaphragm control device. . 1
Is a rotor attached to a base plate (not shown) so as to be rotatable around a rotation axis extending in the same direction as the optical axis. The rotor 1 has a permanent magnet, and an outer peripheral surface thereof is divided into four, and S poles and N poles are alternately magnetized. 2 and 3 are
The stators are made of a soft magnetic material such as iron, and each has a substantially U-shape. The stator 2 and the stator 3 are arranged such that the openings of the U-shaped portions face each other through a predetermined space, and the rotor 1 is arranged in this predetermined space. An output shaft 1a extends from the center of the rotor 1 in parallel with the optical axis (downward in the drawing).

Numerals 4 and 5 are coils composed of conductive wires. The coil 4 is wound around the stator 2, and when the electricity flows through the coil 4, the stator 2 is excited. Further, the coil 5 is wound around the stator 3, and when electricity flows through the coil 5, the stator 3
Is excited.

The rotor 1, the stator 2 and the stator 3
The coils 4 and 5 constitute a known stepping motor proposed in Japanese Patent Publication No. 6-64281 and Japanese Patent Laid-Open No. 2-168240.

A first bevel gear 6 is attached to the lower end of the output shaft 1a and rotates integrally with the output shaft 1a.

Reference numeral 7 is a second bevel gear rotatably attached to a ground plate (not shown). The second bevel gear 7 meshes with the first bevel gear, and its rotation axis extends parallel to the plane orthogonal to the optical axis. Reference numeral 8 denotes a screw member that rotates integrally with the second bevel gear 7 and that has a male screw portion.

Reference numeral 9 denotes a moving member, which is provided with a female screw portion 9a which is screwed with the male screw portion of the screw member 8. The moving member 9 is attached to a base plate (not shown) so as to be movable in the axial direction of the screw member 8 while being prevented from rotating. Therefore, when the screw member 8 rotates, the moving member 9 is moved in the axial direction of the screw member 8 by the axial force generated by the engagement of the screws.

Reference numeral 10 denotes a connecting ring attached to a base plate (not shown) so as to be rotatable around the optical axis. Connecting ring 10
Has cam grooves 10b, 10c, 10d, 10e, 10f. Pins 11a, 12a, 13a, 14a, 15a fixed to diaphragm blades 11, 12, 13, 14, 15 described later are slidably fitted in the cam grooves 10b to 10f. Further, the connecting ring 10 has a groove 1 on the outer circumference.
0a, and a pin 9b fixed to the driving member 9 is slidably fitted in the groove 10a.

Reference numerals 11, 12, 13, 14, and 15 are diaphragm blades, and pins 11a and 1 are attached to these diaphragm blades 11 to 15, respectively.
1b, 12a, 12b, 13a, 13b, 14a, 14
b, 15a and 15b are fixed respectively. Reference numeral 16 is a first base plate, which is fixed to a base plate (not shown). The first main plate 16 has an opening 16a at the center. Pins 11b, 12b, 13b, 14 of diaphragm blades 11-15
b and 15b are rotatably fitted in holes 16b, 16c, 16d, 16e and 16f formed near the outer circumference of the first base plate 16, respectively. Pin the diaphragm blades 11 to 15
By rotating around b, 12b, 13b, 14b, 15b, the area of the diaphragm aperture surrounded by these can be changed.

In the throttle control device configured as described above, the rotational force of the rotor 1 of the step motor is controlled by the bevel gears 6, 6.
7 is transmitted to the screw member 8, and when the screw member 8 rotates, the moving member 9 is moved in the axial direction of the screw member 8,
The connecting ring 10 is rotationally driven. Further, when the connecting ring 10 rotates, the cam grooves 10b to 10f move to the aperture blades 1.
1, 12, 13, 14, 15 are rotated about the holes 16b to 16f to change the area of the aperture opening.

FIG. 2 is an enlarged plan view showing the periphery of the step motor. As can be seen from this figure, in the present embodiment, the step motor having the U-shaped stators 2 and 3 is used as a drive source, and the output of the step motor is transmitted to the screw member 8 by the bevel gears 6 and 7. Therefore, these can be integrated into a compact mechanism, and the thickness T of the lens barrel P can be reduced.

Further, since the moving member 9 is screwed with the screw member 8, the moving amount of the moving member 9 with respect to the rotation angle of the screw member 8 corresponds to the pitch of the screw. Therefore, if the screw pitch is set small, fine position adjustment of the moving member 9 becomes possible. Then, the fine adjustment of the position of the moving member 9 enables the rotational position of the connecting ring 10,
As a result, the aperture area of the aperture formed by the aperture blades 11, 12, 13, 14, and 15 can be finely adjusted.

Further, the screw member 8 and the moving member 9 are a very large reduction mechanism that converts the amount of rotation of the rotor 1 into the amount of movement of the screw member 8 in the axial direction by screw connection. The backlash is less than that of the deceleration mechanism, and the error of the aperture area with respect to the set aperture value is suppressed.

FIG. 3 is a block diagram of an electric circuit. 1
A control circuit 7 is composed of a microcomputer and controls the entire sequence. Reference numeral 18 is a liquid crystal display device or the like, which is a display device for displaying the set aperture value to the user, and 19 is an aperture value input switch that can be manually operated in conjunction with a dial or the like (not shown). The state of the switch 19 determines which aperture value is selected from the aperture values that can be displayed on the display device 18. The determined aperture value is input to the control circuit 17 as the set aperture value.

Here, for example, if the aperture value input switch is of a type that generates a pulse signal, the aperture value according to the number of output pulses is displayed on the display device and is input to the control circuit 17. . In the case of a switch with a variable resistance, the aperture value according to the resistance value is displayed on the display device 18.
And is input to the control circuit 17.

Reference numeral 20 denotes a step motor drive circuit, which energizes the coils 4 and 5 respectively in forward and reverse directions to cause the step motor to perform a forward rotation operation or a reverse rotation operation. Reference numeral 21 is a release switch that is turned on by pressing a release button (not shown).
By turning on, the normal camera sequence such as the focusing operation of the photographing lens, the exposure operation by the shutter device and the film winding operation can be started.

Reference numeral 22 is a data memory. The data memory 22 is preferably a non-volatile memory, and is an EEPROM in this embodiment. In this data memory 22,
Set the aperture opening area corresponding to the set aperture value to the aperture blades 11, 1.
The number of drive steps of the step motor required to actually form the recording pattern 2, 3, 14, 15 is stored. Here, usually, even if the step motor is driven by the same number of steps due to the dimensional accuracy of the parts, rattling, and the like, the aperture area formed is different for each aperture device. Therefore, in the present embodiment, the number of driving steps required to set the aperture opening area corresponding to the set aperture value is stored in the data memory 22 for each aperture device during assembly. As a result, the error between the set aperture value and the actual aperture area of the aperture can be made extremely small. Further, the adjustment pitch of the aperture opening at the time of assembly can be made fine due to the above-described screw connection between the moving member 9 and the screw member 8, and the adjustment work at the time of assembly can be performed easily and precisely.

FIG. 4 is a flow chart showing the operation of the control circuit 17, and the operation of the control circuit 17 will be described below with reference to this flow chart.

In step 1, the aperture value input switch 19
Detect the state of.

In step 2, the aperture value input switch 19
The display device 18 is caused to display the aperture value corresponding to the state.

In step 3, the current aperture area is compared with the aperture value displayed on the display device 18. If they do not correspond, the process proceeds to step 4, and if they correspond, the process proceeds to step 6. The current aperture opening area is determined by a known means, for example, a method of detecting the rotational position of the coupling ring 10 described above or a method of storing the currently formed aperture opening area set in the previous sequence. You can know.

In step 4, the number of driving steps of the step motor required to obtain the aperture opening area corresponding to the set aperture value is read from the data memory 22. As described above, this data is stored in the EEPROM at the time of assembly.

In step 5, the step motor driving circuit 20 drives the step motor by the number of steps according to the data read in step 4. As a result, the connecting ring 10 is rotated to a position where each aperture blade 11 to 15 forms an aperture opening area corresponding to the set aperture value.

In step 6, it is judged whether or not the release switch 21 is ON. If it is ON, the process proceeds to step 7,
If it is OFF, the procedure returns to step 1.

In step 7, a normal camera sequence, for example, a focusing operation of a photographing lens (not shown), an exposure operation of a shutter device (not shown), and a film winding operation are performed.

With the above-mentioned structure, it is possible to control the aperture opening automatically, with a small error due to variations among individuals, and with a fine pitch. In addition, adjustment at the time of assembly is performed by the cam groove 10b of the coupling ring 10 ...
This can be easily performed by changing the data to be stored in the EEPROM without performing mechanical adjustment such as shifting the relative positions of 10f and the diaphragm blades 11 to 15.

(Second Embodiment) FIG. 5 is a perspective view showing an aperture controller according to a second embodiment of the present invention.

In this embodiment, the aperture opening is changed manually by using a step motor instead of automatically. Reference numeral 23 denotes a diaphragm operating ring which is concentrically mounted on the lens barrel P and is rotatably mounted. In addition, in this figure, a part of the diaphragm operation ring 23 is omitted. The operation ring 23 is weakly locked at a predetermined indexing rotation angle by a click structure (not shown).

Reference numeral 24 denotes a first spur gear, which is rotatably attached to a main plate (not shown). The first spur gear 24 rotates integrally with the first bevel gear 6. In addition, the first gear 24
Engages with the internal gear section 23 a formed in a part of the throttle operating ring 23 and transmits the rotation of the throttle operating ring 23 to the first bevel gear 6.

The amount of rotation of the first bevel gear 6 is converted into a minute amount of rotation of the connecting ring 10 by screwing the screw member 8 and the moving member 9 as in the first embodiment.

According to such a structure, the aperture area of the aperture can be finely changed without reducing the pitch of the indexing rotation angle of the aperture operating ring 23, and the mechanism is compact despite the large reduction ratio. Therefore, the backlash can be reduced. Therefore, the aperture area of the diaphragm can be set with high accuracy.

(Third Embodiment) FIGS. 6 to 8 show an aperture control device according to a third embodiment of the present invention. 2
Reference numeral 5 is a second motor (which may be a step motor or a DC motor) attached to a ground plate (not shown).

Reference numeral 26 is a pinion fixed to the output shaft of the motor 25. The pinion 26 meshes with a gear portion 10g provided on the outer circumference of the coupling ring 10.

Reference numeral 28 denotes a stop member, which is provided with a female screw portion 28a which is screwed with the male screw portion of the screw member 8 and which moves in the axial direction of the screw member 8 in a state in which rotation is blocked by a base plate (not shown). It is possible to install. Therefore, when the screw member 8 rotates, the stop member 28 is moved in the axial direction of the screw member 8 by the axial force generated by the engagement of the screws.

The screw member 8 is rotated by a step motor composed of the rotor 1, the stator 2, the stator 3 and the coils 4, 5 as in the first embodiment. The driving force of this step motor is the first. It is transmitted to the screw member 8 by the bevel gear 6 and the second bevel gear 7 meshing with the bevel gear 6.

The stop member 28 has a pin 28b, and this pin 28b can come into contact with the arm 10h of the connecting ring 10. When the arm 10h of the connecting ring 10 contacts the pin 28b, the counterclockwise rotation of the connecting ring 10 in the figure is restricted.

Reference numeral 27 is a stopper provided on a ground plate (not shown), which can come into contact with the arm 10h of the connecting ring 10. When the arm 10h contacts the stopper 27, the clockwise rotation of the connecting ring 10 in the figure is restricted.

When the arm 10h of the connecting ring 10 is in contact with the stopper 27, the diaphragm blades 11, 1
The diaphragm aperture formed by 2, 13, 14, and 15 has the largest area. On the contrary, when the arm 10h is in contact with the pin 28b, the aperture opening area becomes smaller as the pin 28b is located more to the left in the figure (counterclockwise rotation direction of the connecting ring 10).

In the present embodiment, unlike the first embodiment, the connecting ring 10 is directly driven by the motor 25, while the stop member 28 is moved by the step motors (1-5) to stop the connecting ring 10. The aperture area of the diaphragm is set by adjusting (that is, the position at which the arm 10h contacts the pin 28b).

In the present embodiment, the aperture opening is normally held fully open, the motor 25 is driven at the timing immediately before the exposure operation during the release operation, and the aperture opening area set by the step motors (1-5) is obtained. So that the diaphragm blade 11
Suitable for cameras that operate ~ 15. According to this embodiment, the aperture opening can be instantly changed from the fully opened state to the aperture opening area determined by the stop member 28.

Despite having such a function, the present embodiment is a compact mechanism as in the first embodiment and can set a fine aperture.

FIG. 7 is a block diagram of an electric circuit. 1
A control circuit 7 is composed of a microcomputer and controls the entire sequence. Reference numeral 18 denotes a display device including a liquid crystal display device or the like and displaying the aperture value to the user. Reference numeral 19 is an aperture value input switch that can be manually operated in conjunction with a dial or the like (not shown). The state of this switch determines which aperture value is selected from the aperture values that can be displayed on the display device 18. The determined aperture value is input to the control circuit 17 as the set aperture value.

Here, for example, the aperture value input switch 19
Is a type that generates a pulse signal, an aperture value according to the number of generated pulses is displayed on the display device and input to the control circuit 17. In the case of a switch with a variable resistance, the aperture value according to the resistance value is displayed on the display device 18.
And is input to the control circuit 17.

Reference numeral 20 denotes a step motor drive circuit, which applies forward and reverse energization to the coil 4 and the coil 5, respectively, and causes the step motor to perform a forward rotation operation or a reverse rotation operation.

Reference numeral 21 denotes a release switch which is turned on when a release button (not shown) is pressed. By turning on this switch, normal operations such as focusing operation of the photographing lens, exposure operation of the shutter device and film winding operation are performed. Camera sequence can be started.

Reference numeral 22 is a data memory. A non-volatile memory is suitable for the data memory 22, and in the present embodiment, it is an EEPROM. The data memory 22 stores the aperture opening area corresponding to the set aperture with the aperture blades 11, 12, 1.
The number of driving steps of the step motor required to actually form the patterns 3, 4, 15 is stored. The data memory 22 stores the number of driving steps required for forming the aperture opening corresponding to the set aperture value for each aperture device during assembly. As a result, the error between the set aperture value caused by the dimensional error of the component and the actually formed aperture opening can be made extremely small. Further, the pitch for adjusting the aperture area of the diaphragm can also be made fine due to the above-described screw coupling relationship between the moving member 9 and the screw member 8.

Reference numeral 29 is a second motor drive circuit for driving the second motor 25.

Reference numeral 30 is an exposure control means including a known shutter mechanism.

FIG. 4 is a flow chart showing the operation of the control circuit 17, and the operation of the control circuit 17 will be described below with reference to this flow chart.

In step 11, the aperture value input switch 1
9 state is detected.

In step 12, the aperture value input switch 1
The display device 18 is caused to display the aperture value corresponding to the state of 9.

In step 13, the current aperture opening area is compared with the aperture value displayed on the display device 18,
If they do not correspond, the process proceeds to step 14, and if they correspond, the process proceeds to step 16. The current aperture opening area is determined by a known means, for example, a method of detecting the position of the stop member 28 described above or a method of storing the currently formed aperture opening area set in the previous sequence. ,
You can know.

At step 14, the number of driving steps of the step motor required to obtain the aperture opening area corresponding to the set aperture value is read from the data memory 22. As described above, this data is stored in the EEPROM at the time of assembly.

In step 15, the step motor is driven by the number of steps according to the data read in step 14 via the step motor drive circuit 20. As a result, the connecting ring 10 is rotated to a position where each aperture blade 11 to 15 forms an aperture opening area corresponding to the set aperture value.

In step 16, the release switch 21
Is ON, the process proceeds to step 17 if it is ON, and the process returns to step 11 if it is OFF.

In step 17, the second motor drive circuit 2
The second motor 25 is driven via 9 to rotate the connecting ring 10 in the counterclockwise direction in the drawing, and to stop the stop member 28.
The arm 10h of the connecting ring 10 is brought into contact with the pin 28b of the. The aperture area actually formed at this position coincides with the aperture area corresponding to the set aperture value, that is, the value displayed on the display unit 18.

In step 18, the focusing operation of the photographic lens (not shown) and the exposure operation by the exposure control means are performed.

In step 19, the second motor drive circuit 2
The second motor 25 is driven via 9 to rotate the connecting ring 10 in the clockwise direction so that the arm 10h moves to the stopper 27.
Return the connecting ring 10 to the position where it abuts against.

In step 20, a normal camera sequence such as film winding operation is performed. With the above configuration, it is possible to set the aperture opening automatically, with less error between individuals, and with a fine pitch. In addition, adjustment at the time of assembly is performed by the cam groove 10b of the coupling ring 10 ...
This can be easily performed by changing the data stored in the EEPROM instead of mechanical adjustment such as shifting the relative position between 10f and the diaphragm blades 11 to 15.

(Fourth Embodiment) FIG. 9 is a perspective view showing an aperture controller according to a fourth embodiment of the present invention.

In the present embodiment, the diaphragm aperture is changed (that is, the stop member 28 is moved) manually instead of automatically using a step motor.

Reference numeral 31 denotes a diaphragm operation ring which is concentrically and rotatably attached to a lens barrel (not shown). In addition,
In this figure, a part of the diaphragm operation ring 31 is omitted. The operation ring 31 is weakly locked at a predetermined indexing rotation angle by a click structure (not shown).

Reference numeral 32 is a first spur gear, which is rotatably attached to a main plate (not shown). The first spur gear 32 rotates integrally with the first bevel gear 6. Also, the first spur gear 3
Reference numeral 2 meshes with an internal gear portion 31a formed in a part of the throttle operating ring 31, and transmits the rotation of the throttle operating ring 31 to the first bevel gear 6.

The amount of rotation of the first bevel gear 6 is converted into a minute amount of rotation of the connecting ring 10 by screwing the screw member 8 and the stop member 28, as in the third embodiment.

According to such a structure, the aperture area of the aperture can be finely changed without reducing the pitch of the indexing rotation angle of the aperture operating ring 23, and the mechanism is compact despite the large reduction ratio. Therefore, the backlash can be reduced. Therefore, the aperture area of the diaphragm can be set with high accuracy.

In each of the above-described embodiments, the bevel gear is used as the transmission structure from the driving means to the connecting member, but the present invention is not limited to this mechanism, and the helical gear and the lead screw are not limited thereto. It is also possible to use a mechanism using.

The present invention can also be applied to a camera using an image recording medium other than film, and can also be applied to a camera using an image recording medium in which shooting information can be written by a method other than magnetic.

Further, the present invention may be used by combining the above-described embodiments and modified examples, or their technical elements as needed.

Moreover, the present invention is applicable to various types of cameras such as a single-lens reflex camera, a lens shutter camera, a video camera, optical devices other than the camera, and other devices, and those cameras, optical devices and other devices. The present invention can also be applied to devices applied to the above or elements constituting these devices.

(Relationship Between Embodiments and Claims) The connecting ring 10 in each embodiment corresponds to the connecting member in the claims, and the data memory 22 in each embodiment.
Corresponds to the storage means in the claims. Also, the second
The motor 25 in the embodiment corresponds to the first drive means in claim 4, and the step motors (1 to 5) in the second embodiment correspond to the second drive source in claim 4.

Furthermore, the aperture value input switch 19 in each of the embodiments corresponds to the aperture value setting means.

Further, the aperture operating ring 31 in the fourth embodiment corresponds to the operating member recited in claim 10.

The above is the correspondence relationship between each configuration of the present invention and each configuration of the embodiment, but the present invention is not limited to the configuration of these embodiments, and the mechanism or the embodiment described in the claims is not limited thereto. Any structure may be used as long as the function of the structure can be achieved.

[0090]

As described above, in the first invention of the present application, the screw member that is rotationally driven by the drive source and the moving member that is screwed into the screw member and moves in the axial direction of the member are The connecting member (that is, the diaphragm blade) is driven. Therefore, according to the present invention, the operation amount of the drive source can be converted into a minute operation amount via the screw member and the moving unit, and the fine adjustment of the diaphragm aperture can be easily performed. Also, the mechanism consisting of the screw member and the moving means,
Since it is considered that the rattling is less than that in the gear train, the error between the set aperture value and the actual aperture can be reduced.

Incidentally, the connecting member is moved by the first driving source, while the screw member is rotationally driven by the second driving source (or the operating member), and the connecting member is moved by the stopping means which moves in the axial direction of the screw member. Even if it is configured such that the stop is stopped, the fine adjustment of the diaphragm aperture can be similarly easily performed.

Further, a step motor comprising a pair of stator members arranged such that the openings of the substantially U-shaped portions are opposed to each other and an output member arranged between these stator members is used as a photographing lens. Is arranged in a part of the circumference of the lens barrel, the rotation axis of the output member extends parallel to the optical axis of the lens barrel, and the rotation of the output member is changed to a screw member extending parallel to the plane orthogonal to the optical axis. If the transmission is configured, the thickness of the lens barrel can be reduced, and the aperture can be finely adjusted with a compact configuration as a whole.

Further, in addition to the first aspect of the present invention, the second aspect of the present invention is configured to store the control data of the drive source for forming the aperture opening corresponding to the set aperture value in the storage means. ing. Therefore, using the present invention,
The drive source (or the second drive source) can be controlled when the camera is used, based on the control data when the set aperture value and the aperture opening are adjusted to match at the time of assembly and the like. Appropriate shooting can be performed without being affected by variations in the image.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a diaphragm control device according to a first embodiment of the present invention.

FIG. 2 is a plan view of main components of the first embodiment.

FIG. 3 is a block diagram of an electric circuit of the first embodiment.

FIG. 4 is a flowchart showing an operation of the control circuit of the first embodiment.

FIG. 5 is a perspective view showing a diaphragm control device according to a second embodiment of the present invention.

FIG. 6 is a perspective view of a diaphragm control device according to a third embodiment of the present invention.

FIG. 7 is a block diagram of an electric circuit of the third embodiment.

FIG. 8 is a flowchart showing the operation of the control circuit of the third embodiment.

FIG. 9 is a perspective view of an aperture control device that is a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 rotor 2 stator 3 stator 4 coil 5 coil 6 1st bevel gear 7 2nd bevel gear 8 screw member 9 drive member 10 connecting ring 11, 12, 13, 14, 15 diaphragm blade 16 1st main plate 17 control circuit 18 Display device 22 Data memory 28 Stop member 31 Aperture operating ring

Claims (10)

[Claims] 1. A diaphragm control of a camera having a plurality of diaphragm blades, a connecting member for connecting the diaphragm blades so as to be openable and closable, and a driving means for moving the connecting member to open and close the diaphragm blades. In the device, the drive means is screwed to the drive source, a screw member that is rotationally driven by the drive source, and the screw member, and is rotated in the axial direction of the screw member to rotate the connection. A diaphragm control device for a camera, comprising: a moving member that moves the member. 2. The aperture control device for a camera according to claim 1, wherein the drive source is a step motor that performs a step operation in response to a pulse signal. 3. A diaphragm setting means for setting a diaphragm value, and a memory for storing control data of the drive source for forming a diaphragm aperture corresponding to the diaphragm value set by the diaphragm setting means on the diaphragm blades. A diaphragm control device for a camera according to claim 1 or 2, further comprising: 4. A diaphragm control for a camera having a plurality of diaphragm blades, a connecting member for connecting the diaphragm blades so that the diaphragm blades can be opened and closed, and a drive unit for moving the connecting member to open and close the diaphragm blades. In the device, the drive means includes a first drive source that moves the connecting member, a second drive source, a screw member that is rotationally driven by the second drive source, and a screw member that is screwed to the screw member. And a stop member that moves in the axial direction of the screw member by rotation of the screw member and stops the connecting member moved by the first drive source. apparatus. 5. The aperture control device for a camera according to claim 4, wherein the second drive source is a step motor that performs a step operation by a pulse signal. 6. The step motor has a substantially U-shaped portion around which each coil is wound, and a pair of stator members arranged such that openings of the substantially U-shaped portion face each other, and An output member disposed between the stator members, the step motor is disposed in a part of a lens barrel of the photographing lens in a circumferential direction, and a rotation shaft of the output member is disposed in the lens barrel. 3. A rotation transmission unit that extends in parallel with an optical axis, extends the screw member in parallel with a plane orthogonal to the optical axis, and transmits rotation of the output member to the screw member. Alternatively, the camera aperture control device according to item 5. 7. An aperture setting means for setting an aperture value, and control data of the second drive source for forming an aperture opening on the aperture blades corresponding to the aperture value set by the aperture setting means. The aperture control device for a camera according to claim 4, further comprising a storage unit that stores the aperture. 8. The aperture control device for a camera according to claim 3, wherein the storage unit is a non-volatile memory. 9. The camera aperture control device according to claim 8, wherein the non-volatile memory is an EEPROM. 10. A diaphragm control of a camera having a plurality of diaphragm blades, a connecting member for connecting the diaphragm blades so that the diaphragm blades can be opened and closed, and a driving means for moving the connecting member to open and close the diaphragm blades. In the device, the drive means includes a first drive source that moves the connecting member, an operation member that can be manually operated, a screw member that is rotationally driven by the operation member, and screw with the screw member.
A diaphragm control device for a camera, comprising: a stop member that moves in the axial direction of the screw member by rotation of the screw member and stops the connecting member moved by the first drive source. .