JP2521185Y2 - Camera optical system drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in the following order.

A. Industrial fields of use B. Overview of the device C. Conventional technology D. Problems to be solved by the device E. Means for solving the problem F. Action G. Example G ₁ ． Configuration of the first embodiment G ₂ . Operation of the first embodiment G ₃ . Configuration G ₄ of the second embodiment. Operation of the Second Embodiment H. Effect of the Invention A. Field of Industrial Application The present invention relates to an optical system driving device for a camera that moves optical system members such as a shutter and a mirror (single lens reflex).

B. Outline of the Invention The present invention follows a movable member movable between a first position and a second position and a movement of the movable member from the first position to the second position. And an optical system member that is moved from a first position to a second position by moving the moving member toward the first position side from a third position between the first position and the second position. A single detection unit that outputs a different detection result depending on whether it is located or the second position side;
Drive means for driving the moving member, and the moving member,
The moving amount of the moving member relative to the driving amount of the driving unit when the moving member is located closer to the second position than the third position is such that the moving member is located closer to the first position than the third position. A control mechanism for controlling the moving amount of the moving member to be smaller than the moving amount of the driving unit in the case of
And a control means for stopping and controlling the driving means at a timing based on the detection result of the movement from the position to the third position, the braking control of the driving means and the operation of the optical system member by a single detection sensor. It is possible to detect the second position.

C. Conventional Technology An optical system member such as a shutter and a mirror is arranged in the optical system of the camera, and the camera is equipped with an optical system driving device that drives the optical system member in conjunction with a photographing switch and the like. FIG. 9 shows a conventional example of a shutter driving device which is this optical system driving device.

In FIG. 9, the charge lever 50 is movably provided in a first position shown by a chain double-dashed line in FIG. 9 and a second position shown by a solid line in FIG. This charge lever 50
Is configured to be urged to the first position side by the spring 51 and to be moved from the first position to the second position by the driving means including the motor 52. The motor 52 is driven by a motor drive circuit 53, and the motor drive circuit 53 is controlled by a microcomputer 54. Although not shown, the shutter, which is an optical system member, is moved from the non-charge position to the charge position following the movement of the charge lever 50 from the first position to the second position. The shutter is configured to be biased toward the non-charge position and to be held at the charge position by the magnetic force of the electromagnetic magnet. Further, first and second detection sensors 55, 56 are arranged at positions facing the charge lever 50. The detection sensors 55, 56 are composed of photo interrupters, and their outputs are supplied to the microcomputer 54.

When the motor 52 is driven when the charge lever 50 is in the first position, the charge lever 50 moves to the second position side against the spring 51. Then, first, the first detection sensor 55 is turned on (H level), and then the second detection sensor 56 is turned off (L level). The microcomputer 54 detects that the output of the second detection sensor 56 switches from H level to L level (braking point in FIG. 9).
Output a braking signal to the motor drive circuit 53
The brake is applied to 52 and the charge lever 50 is stopped. Following this movement of the charge lever 50, the shutter is moved from the non-charge position to the charge position. When the photographing switch (not shown) is turned on, the microcomputer 54 detects that the shutter is at the charge position because the output of the first detection sensor 55 is at the H level. If the output of the first detection sensor 55 is L level, the photographing mode is stopped. When it is detected that the shutter is at the charge position, the electromagnetic magnet is turned on to hold the shutter at the charge position, and then the charge lever 50 is returned to the first position by the spring force of the spring 51. Then, if the electromagnetic magnet is turned off at a predetermined timing, the shutter is released.

D. Problem to be Solved by the Invention However, in the above-described conventional configuration, the first detection sensor 55 detects that the shutter is at the charging position, and the second detection sensor 56 detects the braking point of the driving means. Therefore, two detection sensors 55 and 56 are required. Therefore, attention must be paid to the relative positional relationship between the surface to be detected of the charge lever 50 and the detection sensors 55 and 56. Although it is desirable that the camera be as small and light as possible, the mounting of the two detection sensors 55 and 56 is contrary to this, which further increases the cost. Therefore, an object of the present invention is to provide an optical system driving device for a camera which solves the above-mentioned drawbacks by performing the above two detections with a single detection sensor.

E. Means for Solving the Problems An optical system driving device for a camera according to the present invention to achieve the above object includes a movable member movable between a first position and a second position, and a movable member. An optical system member that is moved from the first position to the second position following the movement of the member from the first position to the second position, and the moving member is the first position and the second position. Driving the moving member, and only detection means that outputs a different detection result depending on whether it is located on the first position side or the second position side from the third position between the second positions. And a moving amount of the moving member with respect to a driving amount of the driving unit when the moving member and the moving member are located closer to the second position than the third position is. First from the position
A control mechanism for controlling the moving amount of the moving member to be smaller than the moving amount of the driving unit when the moving member is located on the position side of the position, and the first position to the third position of the moving member by the detecting unit. Control means for stopping and controlling the drive means at a timing based on the detection result of the movement to the.

F. Action When the moving member is at the first position and the driving means drives, the moving member moves to the second position side and the optical system member also moves to the second position side. As the movement of the moving member progresses, the output of the detection means switches at the third position (for example, from H level to L level). Then, based on this switching timing, the control means controls the driving means to stop, the moving member is stopped at the second position, and the optical system member is positioned at the second position. The output state of the detecting means differs depending on whether the moving member is on the first position side (for example, H level) and when the moving member is on the second position side (for example, L level). It is possible to detect that the optical system member is at the second position by detecting that the position is on the second position side (for example, L level) from the position, and the optical system member is controlled thereafter.

G. Example G ₁ . Configuration of First Embodiment FIGS. 1 to 4 show a first embodiment of the present invention. In the first embodiment, the case where the present invention is applied to a shutter driving device which is an optical system driving means is shown.

In FIGS. 1 and 2, a support member 2 is provided on a base member 1 with screws 3 at regular intervals. A charge lever 4 as a moving member is arranged between the base member 1 and the support member 2. A guide hole (not shown) is formed in the charge lever 4, and the screw 3 is inserted into the guide hole, so that the charge lever 4 is at the first position shown by a solid line in FIG. It is configured to be slidable between a second position indicated by a chain double-dashed line. A spring locking pin 5 is erected on the upper surface of the charge lever 4, and the spring locking pin 5 projects from the elongated hole 6 of the support member 2. A spring 8 is interposed between the protruding spring locking pin 5 and the spring locking portion 7 of the support member 2,
The charge lever 4 is biased toward the first position by this spring force. The spring locking pin 5 and the elongated hole 6 also serve as a guide when the charge lever 4 slides. Further, arm pressing parts 9 are provided at two positions on the side surface of the charge lever 4, and the tip ends of the charge arms 10 and 11 are arranged on the slide loci of the arm pressing parts 9. The base end side of each of the charge arms 10 and 11 is a support pin 12 and a non-charge position shown by a solid line in FIG.
It is rotatably supported between charge positions shown by a chain double-dashed line in the figure, and is biased toward the non-charge position side by a torsion spring 13. Adsorption part 1 on each charge arm 10, 11
4 is provided, and the attracting portion 14 is located at a substantially contact position with respect to the electromagnetic magnets 15 and 16 at the charging position. The control of the electromagnetic magnets 15 and 16 will be described below. Further, the charge arms 10 and 11 are interlocked with a shutter (not shown) which is an optical system member, and one charge arm 10 is interlocked with the leading blade and the other charge arm 11 is interlocked with the trailing blade. There is. When the charge arms 10 and 11 are in the non-charge position, the leading blade and the trailing blade are in the first position, which is the non-charge position, and when the charge arms 10 and 11 are in the charge position, the leading blade and the trailing blade are in the charge position. The curtain blades and the trailing blades are also located at the charge position which is the second position. The opening portion of the shutter is closed by the front curtain blade when the front curtain blade and the rear curtain blade are both in the charging position, and is closed by the rear curtain blade when both the front curtain blade and the rear curtain blade are in the non-charging position.

The drive means 18 moves the charge lever 4 from the first position to the second position, and includes a motor 19 and a gear mechanism.
20 and a cam mechanism 21 which is a control mechanism. The control of the motor 19 will be described below. The gear mechanism 20 includes a gear 22 fixed to the shaft of the motor 19, a large-diameter tooth portion 23a of an intermediate gear 23 meshing with the gear 22, and an output gear 24 meshing with a small-diameter tooth portion 23b of the intermediate gear 23. It consists of and. The cam mechanism 21, which is a control mechanism, includes a cam roller 25 provided on the side surface of the output gear 24 and a cam plate 26 attached to the charge lever 4. The cam surface 27 of the cam plate 26 is a cam roller.
It is arranged on a locus of rotation of 25 and is formed from a vertical surface 27a and an arc surface 27b. That is, in the cam mechanism 21, the moving amount of the charge lever 4 with respect to the driving amount of the driving means 18 on the second position side from the switching position, which will be described below, is the charging lever with respect to the driving amount of the driving means 18 on the first position side of the switching position. The movement amount is controlled to be smaller than the movement amount of 4.

When the motor 19 is driven, the gear mechanism 20 is driven and the cam roller 25 is rotated. Then, this cam roller 25
Comes into contact with the vertical surface 27a of the cam plate 26, and the cam roller 2
When 5 rotates, the cam roller 25 moves on the vertical surface 27a while pressing the cam plate 26, and the charge lever 4 moves to the second position side against the spring 8. Then, the cam roller 25 moves from the vertical surface 27a to the arc surface 27b, and the cam roller 25
When the arc surface 27b reaches a position near the position indicated by the chain double-dashed line in FIG. 1, the charge lever 4 is positioned at the second position.

The only detection means 28 is composed of only one set of the detected part 29 and the detection sensor. In this embodiment, the charge lever 4
The detected part 29 is provided on the cam plate.
26 is located opposite the end to which it is attached. A photo interrupter 30, which is a detection sensor, is arranged so as to sandwich the detected portion 29, and the photo interrupter 30 is fixed to the base member 1 via a mounting portion. The detected portion 29 has a predetermined length with respect to the sliding direction of the charge lever 4, and the photo interrupter 30 makes a third movement when the charge lever 4 moves between the first position and the second position.
The output is configured to switch only once at the switching position, which is the position of. That is, this switching position is set at a point where the cam roller 25 moves from the vertical surface 27a of the cam surface 27 to the circular arc surface 27b. If the switching roller is closer to the first position than the switching position, the L level is set. In the case of the position of position 2, the H level is output respectively.

FIG. 3 is a circuit block diagram of the shutter driving device, and the output of the photo interrupter 30 is guided to the sensor signal output circuit 31. The sensor signal output circuit 31 signal-processes the output of the photo interrupter 30 into a signal for a microcomputer, and supplies this signal-processed signal to a microcomputer (hereinafter referred to as “microcomputer”) 32. The microcomputer 32 drives the driving means 18 by the output of the photo interrupter 30.
The braking control of the motor 19 is performed, and it is detected whether the shutter is at the charge position. That is, when the output of the photo interrupter 30 is switched from the L level to the H level, the braking control of the driving means 18 is started, it is detected that the output of the photo interrupter 30 is the H level, and the shutter is at the charge position. To detect. When the photographing switch SW is turned on, the microcomputer 32 causes the brake pulse generating means 3 to execute the photographing mode according to a predetermined sequence.
3. Control the motor drive circuit 34 and the magnet switching circuit 35. The details of this control will be described in the section of the operation described below. When the brake signal is output from the microcomputer 32, the brake pulse generation circuit 33 outputs a brake pulse to the motor drive circuit 34. The motor drive circuit 34 operates when the drive signal is output from the microcomputer 32.
When a drive voltage is applied to drive 19 in the forward direction and a brake pulse is output from the brake pulse generation circuit 33,
A drive voltage is applied to drive (brake) the motor 19 in the reverse direction. That is, the control means for stopping and controlling the drive means 18 at a timing based on the detection result of the movement of the charge lever 4 from the first position to the switching position by the detection means 28 by the microcomputer 32, the brake pulse generation circuit 33, and the motor 19. I am configuring. The magnet switching circuit 35 supplies an exciting current to the electromagnetic magnet 15 of the leading blade and the electromagnetic magnet 16 of the trailing blade based on a control signal of the microcomputer 32.

G ₂ . Operation of the first embodiment The operation of the above configuration will be described below.

Now, the charge lever 4 is located at the first position and the cam roller 25 is located at the position shown by the solid line in FIG. At the start of charging (shown by a in FIG. 4), the microcomputer 32
Outputs a drive signal to the motor drive circuit 34 and the motor 19
Drives in the forward direction. Then, the rotational force of the motor 19 is transmitted to the cam roller 25 via the gear mechanism 20, and the cam roller 25
Rotates in the direction of the arrow in FIG. The cam roller 25 first comes into contact with the vertical surface 27a of the cam plate 26, and when the cam roller 25 further rotates, the cam roller 26 moves while moving the vertical surface 27a against the spring 8 and the charge lever 4 moves to the second position. Start moving to the position side. When the cam roller 25 moves from the vertical surface 27a to the arc surface 27b by the rotation of the cam roller 25, the output of the photo interrupter 30 switches from the L level to the H level (shown by b in FIG. 4). Then, the microcomputer 32 outputs a braking signal to the brake pulse generation circuit 33 for a predetermined time, the brake pulse generation circuit 33 outputs a brake pulse, the counter electromotive force is applied to the motor 19, the brake is applied, and then the motor 19 is stopped. The cam roller 25 rotates to the vicinity of the position indicated by the chain double-dashed line in FIG. 1 and stops, and the charge lever 4 is positioned at the second position indicated by the chain double-dashed line in FIG. Following the charge lever 4 moving from the first position to the second position, the charge arms 10 and 11 resist the torsion spring 13 from the non-charge position shown by the solid line in FIG. It rotates to the charging position shown by the chain double-dashed line and stops. By the rotation of the charge arms 10 and 11, the leading blades (not shown) and the trailing blades (not shown) are also moved from the non-charge position to the charge position.

When the photographing switch SW is turned on (indicated by c in FIG. 4), the microcomputer 32 detects that the output state of the photo interrupter 30 is at H level, thereby detecting that the shutter is at the charge position. When detecting the charging position, the microcomputer 32 outputs a control signal to the magnet switching circuit 35, and the magnet switching circuit 35 supplies an exciting current to both electromagnetic magnets 15 and 16. Then, the attraction portions 14 of the charge arms 10 and 11 are attracted by both the electromagnetic magnets 15 and 16. Further, the microcomputer 32 outputs a control signal to the magnet switching circuit 35 and simultaneously outputs a drive signal to the motor drive circuit 34 for a predetermined time. Then, the motor 19 is driven in the forward direction and the cam roller 25 escapes from the arcuate surface 27 of the cam plate 26 and is moved to the position shown by the solid line in FIG. When the cam roller 25 escapes from the arc surface 27b of the cam plate 26, the charge lever 4 is returned to the first position by the spring force of the spring 8. Even if the charge lever 4 is returned to the first position, the charge arms 10 and 11 are held at the charge position by the attraction force of the electromagnetic magnets 15 and 16. Then, after a lapse of a predetermined time t after the photographing switch SW is turned on, the microcomputer 32 outputs a control signal to the magnet switching circuit 35 to stop energizing the electromagnetic magnet 15 of the leading blade. Then, the charge arm 10 of the leading blade moves by the spring force of the torsion spring 13 and the leading blade moves from the charged position to the non-charged position. After this predetermined time t ₁ , the microcomputer 32 outputs a control signal to the magnet switching circuit 35 and the power supply to the electromagnetic magnet 16 of the trailing blade is stopped. Then, the trailing blades move from the charged position to the non-charged position by the same action as described above. The difference in movement timing between the leading and trailing blades,
That is, the shutter is opened for the time of t ₁ and the image is taken. Further, the microcomputer 32 outputs a control signal to perform the above-mentioned charge start operation when a predetermined time t _{2 has} elapsed from the ON signal of the photographing switch SW, and photographing is sequentially performed by repeating the above operation.

G ₃ . Configuration of Second Embodiment FIGS. 5 to 8 show a second embodiment of the present invention. The second embodiment shows a case where the invention is applied to a mirror driving device which is an optical system driving device.

In FIGS. 5 and 6, a support member 37 is supported on the outside of the camera block 36, and the center of a charge lever 38, which is a moving member, is supported by the support member 37. The charge lever 38 is rotatably supported between a first position shown in FIG. 5 and a second position shown in FIG. A spring holding member 39 is fixed to the support member 37, and a first torsion spring 40 is held on the spring holding member 39. Both ends of the first torsion spring 40 are hooked by the support member 37 and the charge lever 38, respectively, and the charge lever 38 is biased to the first position side. The charge lever 38 is provided with a pressing portion 38a, and the pressing portion 38a has a mirror rotation pin.
41 is in contact.

The mirror 42, which is an optical system member, is arranged in the optical path inside the camera block 36.
The supporting arm member 43 is configured to be rotatable between a non-charge position in the first position shown in FIG. 5 and a charge position in the second position shown in FIG. The mirror 42 guides the light to the viewfinder side at the charge position, and guides the light to the image sensor side at the non-charge position. The mirror rotation pin 41 is fixed to the arm member 43, and one end of a second torsion spring 44 is hooked on the mirror rotation pin 41.
The second torsion spring 44 is held by the spring holding member 39 like the first torsion spring 40, and the other end of the second torsion spring 44 is hooked on the charge lever 38. The spring force of the second torsion spring 44 urges the mirror 42 toward the charge position side. However, since this spring force is weaker than the spring force of the first torsion spring 40, the mirror 42 moves to the charge lever 38. Is configured to follow the movement of the.

The drive means 18 moves the charge lever 38 from the first position to the second position, and includes a motor 19 and a gear mechanism.
20 and a cam mechanism 21 which is a control mechanism. The control of the motor 19 will be described below. The gear mechanism 20 includes a gear 22 fixed to the shaft of the motor 19, a large-diameter gear 23a of an intermediate gear 23 meshing with the gear 22, and an output gear 24 meshing with a small-diameter gear 23b of the intermediate gear 23. Become. The cam mechanism 21, which is a control mechanism, comprises a cam plate 45 fixed to the side surface of the output gear 24 and a cam roller 46 attached to one end of the charge lever 38. The cam surface 47 of the cam plate 45 is formed of a diameter variable surface 47a that gradually increases the diameter from the rotation center, a circumferential surface 47b that has the same diameter from the rotation center, and a radial surface 47c that extends in the radial direction. There is. That is, in the cam mechanism 21, the moving amount of the charge lever 38 relative to the driving amount of the driving means 18 on the second position side from the switching position described below is
It is controlled to be smaller than the moving amount of the charge lever 38 with respect to the driving amount of the driving means 18 on the first position side from the switching position.

Then, when the motor 19 is driven, the gear mechanism 20 is driven and the cam plate 45 is rotated. Then, the diameter variable surface 47 of the cam plate 45
When the cam roller 46 comes into contact with a and the cam plate 45 further rotates, the cam plate 45 presses the cam roller 46 and the cam roller 46
Moves on the variable diameter surface 47a of the cam plate 45, and the first torsion spring 4
The charge lever 38 moves to the second position side against 0. Then, the cam roller 46 moves from the variable diameter surface 47a to the circumferential surface 47b.
Moving to position the charge lever 38 in the second position. Even if the cam roller 46 moves on the circumferential surface 47b, the charge lever 38 does not rotate and is located at the second position.

The only detecting means 28 is composed of only a pair of detected parts 29 and a detection sensor. In this embodiment, the charge lever 38
The detected part 29 is provided on the cam plate.
26 is located opposite the end to which it is attached. A photo interrupter 30, which is a detection sensor, is arranged so as to sandwich the detected portion 29, and the photo interrupter 30 is fixed to the camera block 36 via a mounting portion. The detected part 29 has an arc shape having a predetermined length with respect to the rotation direction of the charge lever 4, and the photo interrupter 30 has a third shape when the charge lever 4 moves between the first position and the second position. The output is configured to switch only once at the switching position, which is the position. That is, in this switching position, the cam roller 25 moves from the variable diameter surface 47a of the cam surface 47 to the circumferential surface 47b.
It is configured to output the L level when it is on the first position side from this switching position and the H level when it is on the second position side from this switching position.

FIG. 7 shows a circuit block diagram of the mirror driving device, and the output of the photo interrupter 30 is guided to the sensor signal processing circuit 31. The sensor signal processing circuit 31 signal-processes the output of the photo interrupter 30 into a signal for a microcomputer, and supplies this signal-processed signal to the microcomputer 32.
The microcomputer 32 controls the braking of the motor 19 of the driving means 18 by the output of the photo interrupter 30 and detects whether the shutter is at the charge position. That is, when the output of the photo interrupter 30 is switched from the L level to the H level, the braking control of the driving means 18 is started, it is detected that the output of the photo interrupter 30 is the H level, and the mirror is at the charge position. To detect. Further, when the photographing switch SW is turned on, the microcomputer 32 causes the brake pulse generation circuit 33 to execute the photographing mode according to a predetermined sequence.
And controlling the motor drive circuit 34. The details of this control will be described in the section of the operation described below. When the brake signal is output from the microcomputer 32, the brake pulse generation circuit 33 outputs a brake pulse to the motor drive circuit 34. The motor drive circuit 34 applies a drive voltage to drive the motor 19 in the forward direction when a drive signal is output from the microcomputer 32, and drives the motor 19 in the reverse direction when a brake key pulse is output from the brake pulse generation circuit 33. Drive voltage is applied to (brake). That is, the microcomputer 32, the brake pulse generating circuit 33, and the motor 19 constitute the same control means as in the first embodiment.

G ₄ . Operation of Second Embodiment Hereinafter, the operation of the above configuration will be described.

Now, as shown in FIG. 5, the charge lever 38 is the first
Located in the position of. At the start of charging (shown by e in FIG. 8), the microcomputer 32 outputs a drive signal to the motor drive circuit 34 to drive the motor 19. Then the motor
The rotational force of 19 is transmitted to the cam plate 45 via the gear mechanism 20,
The cam plate 45 rotates in the arrow direction in FIG. When the cam roller 46 first contacts the variable diameter surface 47a of the cam plate 45 and the cam plate 45 further rotates, the cam roller 46 moves on the variable diameter surface 47a and the charge lever 38 resists the first torsion spring 40. The movement starts to the second position side. When the movement of the cam roller 46 moves from the variable diameter surface 47a to the circumferential surface 47b, the photo interrupter
The output of 30 switches from L level to H level (shown by f in FIG. 8). Then, the microcomputer 32 outputs a braking signal to the brake pulse generation circuit 33, the brake pulse generation circuit 33 outputs a brake pulse, and the motor 19 is braked for a predetermined time and then stopped. The cam roller 46 has a circumferential surface 47b slightly moved from the boundary between the variable diameter surface 47a and the circumferential surface 47b.
Stopping up, the charge lever 38 is located in the second position shown in FIG. Following the rotation of the charge lever 38 moving from the first position to the second position, the mirror 42 moves to the fifth position.
It rotates from the non-charge position in the figure to the charge position in FIG. 6 and stops.

When the photographing switch SW is turned on (indicated by g in FIG. 8), the microcomputer 32 detects that the output state of the photo interrupter 30 is at the H level, thereby detecting that the mirror 42 is in the charging position. . When it detects that it is in the charge position, the microcomputer 32 detects the motor drive circuit.
The drive signal is output to 34. Then, the motor 19 is driven for a predetermined time, the cam plate 45 rotates, and the cam roller 46 comes off the circumferential surface 47b and abuts on the radial surface 47c, or the radial surface 47c.
Stop at a point away. When the cam roller 46 is disengaged from the circumferential surface 47b, the charge lever 38 is rotated by the spring force of the first torsion spring 40 from the second position to the first position.
Following this rotation, the mirror 42 is also rotated from the charged position to the non-charged position, and the light in the lens barrel is guided to the image pickup element side to take an image. Further, the microcomputer 32 is the photographing switch
After a lapse of a predetermined time t ₃ from the ON signal of the SW, a control signal is output to perform the above charge start operation, and the above operation is repeated, so that the photographing is sequentially performed.

Although the photo interrupter 30 is used as the detection sensor in the above-mentioned two embodiments, the photo interrupter 30 is not limited to the photo interrupter 30 as long as it can detect the detected portion 29 of the charge levers 4, 38.

In addition, in the above two embodiments, the photo interrupter is used.
Although the braking control of the driving means 18 is performed at the same time when the output of 30 is switched, the braking control may be performed after a predetermined time has elapsed from the switching point of the output of the photo interrupter 30. Further, the braking control is performed by applying a back electromotive force to the motor 19 for a predetermined time and applying a brake. However, the braking control may be performed by simply cutting the driving power of the motor 19. May be performed by controlling the transmission system of.

H. Effect of the Invention As described above, according to the present invention, the first position and the second position
Of the movable member, and an optical system that moves from the first position to the second position following the movement of the movable member from the first position to the second position. Members,
Outputs different detection results depending on whether the moving member is located on the first position side or the second position side with respect to the third position between the first position and the second position. Of the moving member relative to the driving amount of the driving member when the moving member is located closer to the second position than the third position is; The moving amount is the third when the moving member is the third.
Control mechanism for controlling to be smaller than the movement amount of the moving member with respect to the driving amount of the driving means when the moving member is located closer to the first position than the first position, and the first position of the moving member by the detecting means. And a control means for stopping and controlling the driving means at a timing based on the detection result of the movement from the position to the third position. The position can be detected, the detection sensor can be easily attached, the size and weight of the camera can be reduced, and the cost can be reduced.

[Brief description of drawings]

1 to 4 show a first embodiment of the present invention, FIG. 1 is a side view of a shutter driving device, FIG. 2 is a partial plan view of the shutter driving device, and FIG. 3 is a circuit block diagram. FIG. 4 is an output waveform diagram, FIGS. 5 to 8 show a second embodiment of the present invention, FIGS. 5 and 6 are side views of a mirror driving device, and FIG. 7 is a circuit block diagram. FIG. 8 is a diagram showing output waveforms and the like, and FIG. 9 is a configuration diagram of a shutter driving device showing a conventional example. 4,38,50 …… Charge lever (moving member), 18 …… Driving means, 21 …… Cam mechanism (control mechanism), 28 …… Detecting means,
42 Mirror (optical system member).

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Katsumi Ishihara 6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation (72) Inventor Kazunori Watanabe 1-10-2 Maechi, Urawa City, Saitama Prefecture

Claims (1)

(57) [Scope of utility model registration request] 1. A moving member that is movable between a first position and a second position, and a first moving member that follows the movement of the moving member from the first position to the second position. An optical system member that is moved from a position to a second position, and the moving member is positioned closer to the first position than a third position between the first position and the second position, or Only a detection unit that outputs a different detection result depending on whether it is located on the second position side, a drive unit that drives the moving member, and the moving member is located closer to the second position side than the third position. The moving amount of the moving member with respect to the driving amount of the driving unit when positioned is the moving member with respect to the driving amount of the driving unit when the moving member is positioned closer to the first position than the third position. The control mechanism that controls to be smaller than the movement amount of The optical device of a camera, comprising: a control unit that stops and controls the drive unit at a timing based on a detection result of the movement of the moving member from the first position to the third position by the detection unit. System drive.