JP2001021787A - Drive for camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drive for a camera capable of driving by switching plural driven parts by a single driving source without using an actuator such as an electro-magnet. SOLUTION: In this drive for a camera, a shutter opening and closing mechanism part 76 is openedly and closedly driven by a planetary gear mechanism part 71 driven by a motor 1, and a photographing lens driving mechanism part 77 is advancedly and retactedly driven, on the other hand, by a sun gear part 9 of the planetary gear mechanism part 71 via a delay driving mechanism part 72. The shutter opening and closing mechanism part 76 is not driven by the planetary gear mechanism part 71 during a driving period of the photographing lens driving mechanism part 77 driven by the the sun gear part 9, and the photographing lens driving mechanism part 77 is not driven during a driving period of the shutter opening and closing mechanism part 76.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving mechanism of a camera for driving each mechanism built in the camera.

[0002]

2. Description of the Related Art Conventionally, various drive mechanisms for driving a focus adjustment mechanism and an exposure control drive mechanism in a camera by a single motor have been proposed. For example, an electromagnetically driven shutter in a camera disclosed in JP-A-61-9631 or JP-A-61-9632 drives a focus adjustment mechanism and an exposure control mechanism with a single motor. In addition, a latch electromagnet for holding the lens at a fixed position in the above focus adjustment is required. Therefore, the size of the camera body becomes large, and it is difficult to make the camera compact.

Therefore, an electromagnetically driven shutter (lens shutter) for a camera disclosed in Japanese Patent Application Laid-Open No. 1-116626 has been proposed as eliminating the need for the latching electromagnet. The electromagnetically driven shutter is in contact with a primary rotating member that is constantly linked to the rotation of the forward / reverse rotation motor, and abuts and engages the primary rotating member at a specific rotational position, and rotates together with the primary rotating member in forward rotation. A secondary rotation member, a focus adjusting lens barrel that moves in conjunction with the secondary rotation member, and a lens shutter supported by the secondary rotation member and opened and closed by forward rotation relative to the primary and secondary rotation members. A one-way locking mechanism for allowing the rotation of the secondary rotating member from the initial position to the terminal position and preventing the rotation in the reverse direction, and one direction when the secondary rotating member is rotated to the terminal position. Means for releasing the locking of the locking mechanism.

[0004]

However, in the electromagnetically driven shutter of the camera disclosed in the above-mentioned Japanese Patent Laid-Open Publication No. 1-116626, sawtooth teeth at predetermined intervals are applied as locking means in the one-way locking mechanism. Therefore, there has been a restriction on the position index interval for the focus adjustment operation. Further, the lens shutter includes the primary and secondary lenses.
It is opened and closed by the relative rotation in the forward direction with respect to the next rotating member, but the primary and secondary rotating members rotate with respect to the lens barrel by the focus adjusting operation. Therefore, the attitude of the sector when the lens shutter is opened also rotates, and there is a problem that the opening attitude of the sector changes depending on the focus adjustment position (lens extension position) and the exposure state changes.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and it is possible to switch and drive a plurality of driven parts by a single drive source and without using an actuator such as an electromagnet. It is an object of the present invention to provide a camera driving mechanism that is possible and has less restrictions on the driving position of a driven part and the like and has a simple configuration.

[0006]

According to a first aspect of the present invention, there is provided a driving mechanism for a camera, comprising: a driving source; a sun gear rotating by receiving a driving force of the driving source; A planetary gear that revolves around the sun gear and further rotates, a first driven unit that is rotated and driven by rotation of the planetary gear at a predetermined position, and receives a driving force from the sun gear. A second driven unit that is driven to rotate, disposed between the sun gear and the second driven unit, for transmitting a driving force from the sun gear to the second driven unit; A driving force transmitting means set to a state and a state for not transmitting the driving force from the sun gear to the second driven portion, wherein the sun gear is rotationally driven and the planetary gear is driven. Is driving the first driven portion at the predetermined position, Serial driving force transmission means does not drive the second driven portion.

According to a second aspect of the present invention, there is provided a camera driving mechanism according to the first aspect, wherein the driving force transmitting means has two gears, and one of the gears is connected to the second gear. The sun gear always meshes, the other gear always meshes directly with the second driven part, or via a connecting member, and the two gears rotate relative to each other within a predetermined rotation angle and Does not transmit driving force.

According to a third aspect of the present invention, there is provided a camera driving mechanism according to the first or second aspect, wherein the first driven portion and the second driven portion are respectively provided. A shutter opening / closing mechanism and a photographing lens driving mechanism.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of a driving mechanism of the camera according to the first embodiment of the present invention. FIG. 2 is a longitudinal sectional view around the first and second planetary gears in the camera driving mechanism. FIG. 3 is a plan view around the first and second planetary gears, and shows a state where the gears can mesh with each other. FIG. 4 is a plan view around the first and second planetary gears and shows a state where the gears cannot mesh with each other. In the following description, the rotation direction of each member is indicated by the rotation direction when viewed from above in FIG. 1 and the like, and the clockwise direction is the CW direction and the counterclockwise direction is the CCW direction.

The drive mechanism of this embodiment is applied as a drive mechanism that switches and drives a shutter opening / closing drive mechanism of a camera and a photographing lens focus adjustment drive mechanism. This drive mechanism mainly includes a drive unit 70 having a drive source, a drive unit 7
0, a planetary gear mechanism 71, a delay drive mechanism 72, which is a drive force transmitting unit that is driven through the planetary gear mechanism 71 and is capable of idling within a predetermined angle range, and a delay drive mechanism 72. Drive unit 73, a connection drive unit 74 that is reset by the cam drive unit 73 and is driven by the planetary gear mechanism unit 71, and a connection drive unit 7.
4, a shutter opening / closing mechanism 76 serving as a first driven unit that opens and closes a shutter, and an image taking unit serving as a second driven unit that drives an imaging lens driven by a cam driving unit 73 forward and backward. The lens drive mechanism 77 is provided.

The driving unit 70 is a single driving source.
A motor 1 in which a pinion 2 and a slit plate 3 are fixed to an output shaft;
Large gear 6 and small gear 7 integrated with large gear 6
And a motor PI (photo interrupter) 61 which is a motor rotation amount detecting means for detecting passage of the slit due to rotation of the slit plate 3.

The planetary gear mechanism 71 includes a gear 9 meshing with the small gear 7 rotatably supported on a support shaft 8, a sun gear 10 integral with the gear 9, and a sun gear 1.
0, a carrier 12 rotatably supported coaxially with a friction, a gear supporting shaft 11 fixed to the carrier 12, and a rotatable (rotating) supported by the gear supporting shaft 11. , A revolving first planetary gear 13 which is always in mesh with the sun gear 10, a fan-shaped shield plate 14 fixed to the carrier 12, and a planet PI62 for detecting the rotational position of the carrier 12 based on the position of the shield plate. And body stoppers 58, 5 for limiting the rotational position of carrier 12
9 Further, as shown in FIG.
The gear support shaft 11 that supports the third gear 3 has a tip portion 11a protruding from the first planetary gear 13, and acts as a stopper for a reset lever 34 described later.

In the planetary gear mechanism 71, when the sun gear 10 rotates in both directions, the carrier 12 rotates in the CW direction or the CCW direction due to the friction, and the main body stopper 58 or 59. (See FIGS. 3 and 4). When the carrier 12 is in contact with the stopper 58, the first planetary gear 13 is at a separated position P13A where it cannot mesh with a second planetary gear 36, which will be described later, and when the carrier 12 is in contact with the stopper 59. , The first planetary gear 13 is a second planetary gear 3
6 is located at a contact position P13B where it can be engaged.

The delay drive mechanism 72 is provided on the first drive side.
It comprises a delay gear 17 and a second delay gear 18 on the driven side. The first delay gear 17 is a gear portion rotatably supported by the support shaft 16, and includes a driving pin 17a as a connecting member.
Has been planted. The second delay gear 18 is connected to the support shaft 1.
The shaft hole 18a into which the motor 6 is rotatably fitted and the drive pin 17g can be slidably fitted therein, and has an arc-shaped elongated hole 18b having a predetermined angle.

The first delay gear 17 is always meshed with the gear 9 of the planetary gear mechanism. Second delay gear 18
The rotation is transmitted to the cam gear 22 in a state where the drive pin 17g of the first delay gear 17 is in contact with the end in the rotation direction of the arc-shaped long hole 18b. In a state where 17g is in the middle of the arc-shaped long hole 18b, the rotation is not transmitted.

The cam driving section 73 includes a cam gear 22 which is a connecting member rotatably supported by the support shaft 21, a switching cam 23 and a shielding plate 24 which are integral with the cam gear and have a projection 23a, And a cam PI 63 for detecting the rotational position of the cam.

The connection driving section 74 includes a reset lever 32 rotatably supported by the support shaft 31 and a connection lever 34 rotatably supported by the support shaft 33 and rotatably driven by the reset lever 32. And connecting lever 34 to C
And a connection lever spring 37 formed of a torsion spring biasing in the W direction.

The reset lever 32 is provided with a driven pin 32a driven by the cam 23 and a gear portion 32b. The connection lever 34 has a gear portion 34a that always meshes with the gear portion 32b of the reset lever, a gear support shaft 34b fixed to the distal end portion, and a rotatable and revolvable third gear supported by the gear support shaft 34b. Two planetary gears 36 are provided. Also, as shown in FIG.
The stopper contact portions 34c and 34d are provided on the protrusions on the lower side of the side surface of No. 4.
Is provided.

When the connecting lever 34 is rotated in the CW direction while the first planetary gear 13 of the planetary gear mechanism 71 is at the separated position P13A, the second planetary gear 36 is moved to a seesaw gear 42a, which will be described later. From the separated position P36A released from the one planetary gear 13, it rotates in the CW direction. Then, the contact portion 34c of the connecting lever 34 contacts the main body stopper 60 as shown in FIG. 3, and the second planetary gear 36
It is located at a contact position P36B that can be engaged with 2a. Thereafter, when the first planetary gear 13 rotates in the CCW direction and rotates to the contact position P13B, the first planetary gear 13 meshes with the second planetary gear 36 (see FIG. 9).

However, even when the connecting lever 34 is driven to rotate in the CW direction while the first planetary gear 13 is previously moved to the contact position P13B, the contact portion 34c is supported by the first planetary gear support. It interferes with the tip 11a of the shaft 11. Therefore, as shown in FIG. 4, the second planetary gear 36 cannot move to the contact position P36B, and cannot mesh with the seesaw gear portion 42a and the first planetary gear 13.

The shutter opening / closing mechanism 76 includes a support shaft 4
1 and two sectors 5 rotatably supported by the sector support pins 50a and 50b and opening and closing the photographing lens opening 53 on the camera body side.
1, 52, a seesaw spring 43 for urging the seesaw lever 42 in the CCW direction, and an AE-PI 64 for detecting the movement of the leading end 51c of the sector and detecting the open / closed state of the sector.

The seesaw lever 42 includes a seesaw gear portion 42a that can mesh with the second planetary gear 36, and a sector 5
1, 52 are provided with sector drive pins 42b fitted into the drive holes 51b, 52b.

When the seesaw lever 42 is in a closed state (a state in which the seesaw lever 42 is not engaged with the second planetary gear 36), the lever 42 is urged in the CCW direction and its position is regulated by the seesaw stopper 80. Then, the sector drive pin 42b
, The sectors 51 and 52 are held at a shutter closed position that closes the opening 53 (see FIG. 6 and the like). When the seesaw lever 42 is rotationally driven in the CW direction by the second planetary gear 36, the sectors 51 and 52 are rotated by the sector drive pin 42b to the shutter open position where the photographing lens opening 53 is opened (FIG. 10). reference).

The photographing lens drive mechanism 77 is rotatably supported by a support shaft 55b, and includes a gear 55 which is always meshed with the cam gear 22, a feed screw 56 integrated with the gear 55, and a driven pin 57a. A lens frame 57 (only a part is shown in FIG. 1) for holding a taking lens (not shown)
Consists of The driven pin 57a is fitted into a thread root 56a of the feed screw 56, and drives the lens frame 57 to advance and retreat between the feeding end and the feeding end with the rotation of the feed screw 56.

An LD spring (not shown) is provided below the gear portion 55 so that the delay gear 18 does not operate due to a sliding load (frictional force) when the power is not transmitted. .

The support shafts 5, 8, 16, 21, 21
31, 33, 41, 55b and sector support pins 50a,
50b, stoppers 58, 59, 60, 80 and each PI
61, 62, 63, 64, etc. are assumed to be fixedly supported by the camera body or the drive mechanism body.

Here, the circumferential angle θ0 of the arc-shaped long hole 18b provided in the second delay gear 18 will be described. In the present driving mechanism, the gear 9 integral with the sun gear 10 is driven to rotate so as to be adjusted once (focal adjustment), and then the shutter is opened and closed without changing the photographing lens position. To control. To do so, the cam gear 22 is rotated to drive the lens frame 57 to a predetermined position, and then the gear 9 is rotated.
To rotate the first planetary gear 13 from the separation position P13A to the contact position P13B (see FIGS. 3 and 4), and further rotate the first planetary gear 13 to open the shutter. During both periods, it is necessary to keep the second delay gear 18 in a non-rotating state so as to prevent the taking lens from moving forward and backward.

From the above-described conditions, the gear 9 (accordingly,
The first planetary gear 13 driven by the sun gear 10) is moved from the separated position P13A (see FIGS. 3 and 6) to the contact position P13.
The rotation angle of the gear 9 required to rotate between B (see FIGS. 4 and 9) is defined as θ1. Further, when the second planetary gear 36 is in mesh with the first planetary gear 13 and the seesaw gear portion 42a, the rotation angle of the gear 9 required to rotate the sectors 51 and 52 from the closed state to the open state is set. θ2. When the gear ratio between the gear 9 and the first delay gear 17 is γ, the angle θ0 (effective angle excluding the pin diameter) of the arc-shaped long hole 18b of the second delay gear 18 is θ0 ≧ (θ1 + θ2). × γ
Becomes

Next, an electric control circuit in the camera according to the present embodiment, particularly relating to the drive mechanism, will be described with reference to the circuit diagram of FIG. An electric control circuit related to the driving mechanism includes a CPU 81 serving as control means for mainly controlling the entire camera, a power supply unit 82, a release switch 83
, A motor driver 84, the motor 1, and the cam PI
63, Planet PI62, AE-PI64, Motor PI61
And the light emitting diode driving transistor 8 of each PI
6, 89, 92, and 95; load resistors 87, 90, 93, and 96 of the transistors; and load resistors 88, 91, 94, and 97 of the photodiodes of the PIs.

The drive transmission switching operation of the drive mechanism of the camera constructed as described above according to the present embodiment will be described with reference to FIGS. 6 to 17 and FIGS. The explanation will be given while using the same. 6 to 17 are plan views showing the reset state of the drive mechanism and each drive operation state, and FIGS.
5 is a time chart showing the movement of each control member of the drive mechanism.

When the camera is in a reset state before the release switch 83 is operated, the drive mechanism is in an initial state shown in FIG. 6 at an elapsed time t1 on the time chart of FIG. In this state, the carrier 12 is rotated in the CW direction and is in contact with the stopper 58, and the first planetary gear 13 is in the separated position P13 at which the second planetary gear 36 cannot mesh.
A The reset lever 32 is connected to the projection 23a of the cam 23.
, The second planetary gear 36 is also at the separated position P36A where it does not mesh with the seesaw gear portion 42a.

The shutter opening / closing mechanism 76 holds the sectors 51 and 52 at a shutter closing position where the opening 53 is closed. The taking lens driving mechanism 77 holds the lens frame 57, that is, the taking lens at the retracted end by rotating the feed screw 56.

Next, when the release switch 83 is operated and a release-on signal is input to the CPU 81 at the elapsed time t2 in the time chart of FIG. 18, the release processing routine of FIG. Photometry and ranging are performed. Then, in step S3, a driving voltage in the CW direction is applied to the motor 1. The application period of the drive voltage is time T1.

With the rotation of the motor 1 in the CW direction,
The first delay gear 17 rotates in the CCW direction via the gear 9 to bring the drive pin 17a into contact with the end of the elongated hole 18b of the second delay gear 18. Thereafter, the first delay gears 17 and 18 are both rotated in the CCW direction, the cam gear 22 is rotated in the CW direction, and the output signal “H” (ON) is changed from the shielded state to the transmitted state by the cam PI 63 at the elapsed time t3. It is output (state of FIG. 7). If the output is confirmed in step S4, the process proceeds to step S5.

Thereafter, the motor 1 rotates in the CW direction as it is, the first and second delay gears continue to rotate in the CCW direction, and the cam gear 22 also rotates in the CW direction. Feed screw 56
Is driven to rotate by the rotation of the cam gear 22, and the feeding of the lens frame 57 (photographing lens) is started.

At step S5, counting of output pulses (LD pulses) of the motor PI61 is started. If it is determined in step S6 that the number of LD pulses has reached the desired number of pulses or has reached the pulse number Pa corresponding to the predetermined lens frame 57 (photographing lens) movement position, the motor 1 is stopped in step S7. First and second delay gears 17, 18,
The cam gear 22 also stops, and the lens frame 57 stops at the extension position.

The number of LD pulses is the number of pulses for detecting the amount of rotation of the motor, and is used for detecting the amount of movement of the photographing lens and for detecting the rotational position of another mechanism.

The state when the motor 1 is stopped is the state of the elapsed time t4 in FIG. 18, and is shown in FIG. The first and second reset levers 32 and 34 rotate with the rotation of the cam 23 during the driving period T1, and the second planetary gear 36 rotates from the separation position P36A to the contact position P36B, and the seesaw gear It engages with the part 42a.

Then, the process proceeds to a step S8, wherein a low-speed drive voltage in the CCW direction is applied to the motor 1. The application period of the drive voltage is time T2. When the motor 1 is driven at a low speed in the CCW direction, the sun gear 10
Rotate in the CCW direction, and the carrier 12 and the first planetary gear 13 rotate in the CCW direction. During this period, the first delay gear 17 rotates in the CW direction and the drive pin 17a
8b, the first delay gear 17 idles, and the second delay gear 18 does not rotate because it is biased by the LD spring. Therefore, the cam gear 22 is stopped, and the lens frame 57 is held at the above-mentioned extended position.

If the output signal "H" in the transmission state of the planet PI62 is detected in step S9, and it is detected that the carrier 12 rotates in the CCW direction, the process proceeds to step S10.

The low-speed drive voltage of the motor 1 can move the carrier 12 and the first planetary gear 13 to the contact position, and keep the sectors 51 and 52 at the closed position, that is, It is set to a voltage that outputs a torque smaller than the urging force.

In step S10, counting of output pulses (LD pulses) of the motor PI61 is started. Motor 1
Continues the low-speed driving in the CCW direction, the carrier 12 contacts the stopper 59, and the first planetary gear 13 contacts the contact position P13B. When it comes in contact with the set voltage,
Since the seesaw gear 42 is not driven in the sector opening direction,
a, The second planetary gear 36 is locked with play.

When the lock is established, the motor PI61
The output pulse (LD pulse) is no longer output, and it is recognized that the reference position before the shutter opening operation has been reached (step S11), and the motor 1 is temporarily stopped in step S12 (elapsed time t5 in FIG. 18). 9 in FIG. 9).

Subsequently, at step S13, C is applied to the motor 1.
A full drive voltage in the CW direction is applied. This drive voltage application period is set to time T3 (corresponding to shutter time).
Seesaw lever 4 by full drive of motor 1 in CCW direction
2 rotates in the CW direction, and the sectors 51 and 52 are driven in the opening direction at high speed. If it is detected in step S14 that the output signal of the AE-PI 64 is "H", it is determined that the lens opening 53 has begun to open, and the counting of the shutter time T is started in step S15. If it is detected in step S16 that the shutter time T has reached the predetermined T3, the process proceeds to step S17.

During the rotation of the motor 1 in the CCW direction, the first planetary gear 13 is in the contact position P13B where the second planetary gear 36 meshes, and the second planetary gear 36 is in the seesaw gear portion 42a. The contact position P where each meshes
The rotation of the first planetary gear 13 is transmitted to the seesaw gear portion 42a. On the other hand, the first delay gear 17
The drive pin 17a idles in the CW direction while moving in the elongated hole 18b of the second delay gear 18. Therefore, the cam gear 22 is stopped, and the lens frame 57 is not driven forward or backward.

In step S17, the driving of the motor 1 in the CCW direction is stopped. Subsequently, in step S18, application of a drive voltage in the CW direction to the motor 1 is started. The voltage application period is time T4. The motor 1 is stopped at an elapsed time t6 in FIG. 18 with a slight delay, and starts rotating in the CW direction. FIG. 10 shows a state at the elapsed time t6 after the shutter time T3, and shows a state in which the sectors 51 and 52 have been rotated to the fully open end of the shutter opening 53.

FIG. 11 shows the elapsed time t7 in FIG.
3 shows the shutter closed state. In this state, the sun gear 10 rotates in the CW direction due to the rotation of the motor 1 in the CW direction, and the first planetary gear 13 rotates in the CCW direction. Since the first planetary gear 13 rotates in the CCW direction, the seesaw lever 42 rotates in the CCW direction by the urging force of the seesaw spring 43 to rotate the sectors 51 and 52 to the closed position.

The sectors 51 and 52 are closed and the lens opening 53 is closed.
Is closed, the carrier 12 rotates in the CW direction and contacts the stopper 58, and the output signal of the planet PI62 switches to "L" (off). In this state, the first planetary gear 13 moves to the separated position P13A, and the engagement with the second planetary gear 36 is released. Further, by driving the motor 1 in the CW direction, the first delay gear 17 reverses in the CCW direction and idles with respect to the second delay gear 18. Thereafter, the drive pin 17a comes into contact with the end of the elongated hole 18b of the second delay gear 18. The above state corresponds to the elapsed time t in FIG.
8 is shown in FIG.

Thereafter, the driving of the motor 1 in the CW direction is continued, the first and second delay gears 17 and 18 integrally start rotating in the CCW direction, and the cam gear 22 rotates in the CW direction. By the rotation of the cam gear 22, the feed screw 56 rotates in the CCW direction via the screw gear 55, and the lens frame 57 is driven in the extending direction.

Further, since the reset lever 32 abuts on the projection 23a of the cam 23, the reset lever 34
The gear rotates in the W direction, and the second planetary gear 36 moves to the separated position P36A.
Go to

When the lens frame 57 reaches the feed-out end (closest position) by the feed-out drive by the feed screw 56, and it is detected in step S19 that the output signal of the cam PI 63 has become "L", step S20 is performed. To start counting output pulses (LD pulses) of the motor PI61 for driving with a predetermined margin. Step S21
If it is detected that the count number has reached the predetermined pulse number PC, the motor 1 is temporarily stopped in step S22. The above state is the state of the elapsed time t9 in FIG. 19 and is shown in FIG.

Then, the process proceeds to a step S23, wherein the motor 1
Is applied with a driving voltage in the CCW direction. The drive voltage application period is time T5. When the motor 1 starts rotating in the CCW direction, the first delay gear 17 rotates in the CW direction,
It runs idle for a predetermined period with respect to the second delay gear 18. After idling,
Since the cam gear 22 rotates in the CCW direction together with the second delay gear 18 in the CW direction, the screw gear 55 is driven in the CW direction by the rotation, and the lens frame 57 is retracted.

In step S24, the output signal "H" of the cam PI 63 is detected, and the process further proceeds to step S25 to continue driving the motor 1 in the CCW direction. Step S26
If the output signal “L” of the cam PI 63 is detected at step S, it is determined that the lens frame 57 has arrived at the retraction end,
Proceed to 27.

In step S27, the output pulse (LD pulse) of the motor PI61 is counted while rotating the motor 1 in the CCW direction to further rotate the cam gear 22 in the CCW direction by a predetermined margin. Step S2
8, if it is detected that the output pulse number has reached the predetermined pulse number Pd, the process proceeds to step S29,
To stop.

During the lens frame retracting drive period, when the second planetary gear 36 is at the separated position P36A, the motor 1
The carrier 12 rotates in the CCW direction together with the sun gear 10 due to the rotation in the CCW direction of FIG.
The first planetary gear 13 also moves to the contact position P13B.

When the cam gear 22 rotates in the CCW direction and the driven pin 32a of the reset lever 32 is in a phase other than the protrusion 23a of the cam 23, the connecting lever 3
4 is urged in the CW direction by the urging force of the connecting lever spring 37, and the second planetary gear 36 attempts to rotate to the contact position P36B. However, since the engaging portion 34d of the connecting lever 34 abuts on the tip end 11a of the gear support shaft 11 of the first planetary gear 13 at the contact position P13A, the second planetary gear 36
Stops at the position P13A 'near the separation position P36A, and is prevented from moving to the contact position P36B (see FIGS. 4 and 15).

Therefore, during this period, the first planetary gear 1
The rotation force in the CW direction 3 is not transmitted to the seesaw lever 42 side, and the sectors 51 and 52 are not opened. The above state is the state of the elapsed time t10 to t12 in FIG. 19, and is shown in FIGS.

Subsequently, in step S30, the motor 1
, A driving voltage in the CW direction is applied. The application period of the drive voltage is time T6. When the motor 1 rotates in the CW direction, the first delay gear 17 rotates in the CCW direction. First
The drive pin 17a of the delay gear 17 moves in the long hole 18b of the second delay gear 18, and CC between the drive pin 17a and the second delay gear 18
A state is set in which there is a predetermined amount of play in the W direction. Further, by driving the sun gear 10 in the CW direction, the carrier 1
2 is rotated in the CW direction, and the first planetary gear 13 is returned to the separated position P13A. The driven pin 32a of the reset lever 32 abuts on the projection 23a of the cam 23, and the coupling lever 34 is rotated in the CCW direction.
6 is also located at the separation position P36A.

In step S31, the output pulses (LD pulses) of the motor PI61 are counted. If it is detected in step S32 that the count number matches the predetermined pulse number Pe, it is determined that the above-described reset operations have been completed. Then, the release process by the drive mechanism of the present embodiment ends. The above state is the state of the elapsed time t13 in FIG. 19 and is shown in FIG.

According to the camera driving mechanism of the present embodiment,
Without using an actuator such as an electromagnet, the motor 1 as a single driving source moves the lens frame 57 of the photographing lens driving mechanism 77 as a plurality of driven parts and opens and closes the sectors 51 and 52 of the shutter opening and closing unit 76. Can be switched for driving. Further, the indexing position in the advance / retreat driving of the photographing lens can be set finely, and there is no restriction on the focus adjustment position accuracy. In addition, during the opening and closing operations of the sectors 51 and 52, since the opening posture does not change, good exposure is performed.

Next, a description will be given of a camera driving mechanism according to a second embodiment of the present invention. FIG. 22 is an exploded perspective view of a camera driving mechanism according to the second embodiment of the present invention. FIG.
FIGS. 3 to 30 are plan views showing respective operation states of the drive mechanism of the camera. In the following description, the rotation direction of each member is also indicated by the rotation direction when viewed from above in FIGS. 22 and 23, and the clockwise direction is the CW direction and the counterclockwise direction is the CCW direction.
W direction.

The drive mechanism of the present embodiment is also applied as a drive mechanism for switching and driving a shutter opening / closing drive mechanism of a camera and a photographing lens focus adjustment drive mechanism as an application example. On the other hand, the configuration of the coupling driving unit 111 and the configuration of the photographing lens driving mechanism unit 110 as the second driving unit are different, and the configuration of the other
In addition, the same configuration of the electric control unit is applied.
However, a part of the control content of the CPU 81 as the control means is different. Hereinafter, different parts will be described, but the same components will be described with the same reference numerals as those of the drive mechanism of the first embodiment.

The photographing lens drive mechanism 110 has a lens extension cam 101 having a cylindrical end cam 101a and an inclined cam 101b integrally provided on the cam gear 22, and a driven pin 102a. The lens frame 102 (only a part is shown in FIG. 1) holds a lens (not shown). The driven pin 102a is in contact with the cylindrical end cam portion 101a, and slides on the end cam portion 101a as the lens feeding cam 101 rotates. The driven pin 102a drives the lens frame 102 forward and backward between the extended end and the extended end.

When the lens extension cam 101 is rotated in one direction CW, the driven pin 102a passes through the inclined cam portion 101b from the position corresponding to the extension end on the end cam portion 101a, and then moves to the end cam portion. It is assumed that it moves to a position corresponding to the retraction end on 101a.

An LD spring (not shown) is provided below the cam gear 22 to prevent the second delay gear 18 from operating due to a sliding load or the like when the power is not transmitted. .

The connection drive section 111 includes a reset lever 103 rotatably supported by the support shaft 31 and a support shaft 3.
3 includes a connecting lever 104 rotatably supported by the reset lever 103 and rotationally driven by the reset lever 103, and a connecting lever spring 37 for urging the connecting lever 104 in the CW direction.

The reset lever 103 has a cam 23
, And a driving pin 103b for driving the connecting lever 104 are provided. The coupling lever 104 has a U-shaped groove 104a in which a reset lever drive pin 103b is fitted, a gear support shaft 104b fixed to the other end, and a second planet rotatably supported by the gear support shaft 104b. A gear 105 is provided.
In addition, stopper abutting portions 104c and 104d are provided on a protruding portion below the side surface of the connecting lever 104.

When the first planetary gear 13 of the planetary gear mechanism 71 is at the separated position P13A, the connecting lever 104
The second planetary gear 105 is rotated in the CW direction from the separated position P105A where the second planetary gear 105 is released from the seesaw gear portion 42a and the first planetary arcuate gear 13, and is rotated in the CW direction.
4c contacts the main body stopper 60 as shown in FIG.
It moves to the contact position P105B where it can mesh with the seesaw gear portion 42a. Thereafter, when the first planetary gear 13 rotates in the CCW direction and rotates to the contact position P13B, the first planetary gear 13 meshes with the second planetary gear 105 (see FIG. 26).

The drive transmission switching operation of the drive mechanism of the camera according to the present embodiment configured as described above will be described with reference to FIGS. 23 to 30
FIG. 31 is a plan view showing each driving operation state from the reset state of the driving mechanism, and FIGS. 31 and 32 are time charts showing the movement of each control member of the driving mechanism.

When the camera is in an initial reset state before the release switch 83 is operated, the drive mechanism is in an initial state shown in FIG. 23 at an elapsed time t1 on the time chart of FIG. In this state, the carrier 12 is rotated in the CW direction and is in contact with the stopper 58, and the first planetary gear 13 is at the separated position P13A where it cannot mesh with the second planetary gear 105. Since the reset lever 103 is in contact with the protrusion 23a of the cam 23, the second planetary gear 105 is also at the separated position P105A where it does not mesh with the seesaw gear 42a.

On the other hand, the sectors 51 and 52 are kept at the shutter closed position by the shutter opening / closing mechanism 76. Also,
The lens frame 102, that is, the photographing lens is retracted into the retracting end by the photographing lens drive mechanism 77.

Next, when the release switch 83 is operated and an ON signal is input to the CPU 81 at the elapsed time t2 in the time chart of FIG. 31, first, photometry and distance measurement are performed, and the motor 1 is driven in the CW direction. A drive voltage is applied.
The drive voltage application period is time T1.

With the rotation of the motor 1 in the CW direction,
The first delay gear 17 is rotated in the CCW direction via the gear 9, and the drive pin 17 a contacts the end of the elongated hole 18 b of the second delay gear 18. Thereafter, the first delay gears 17 and 18 are both rotated in the CCW direction, the cam gear 22 is rotated in the CW direction, and at the elapsed time t3, the cam PI 63 changes from the blocking state to the transmission state, and the output signal "H" is output. (State of FIG. 24).

The motor 1 rotates in the CW direction as it is, the first and second delay gears continue to rotate in the CCW direction, and the cam gear 22 also rotates in the CW direction. Accordingly, the cam 101 for feeding the lens is driven to rotate, and the feeding of the lens frame 102 is started.

When it is detected that the output pulse of the motor PI61 has reached the predetermined pulse number Pa corresponding to the position of the predetermined lens frame 102 (photographing lens), the motor 1 is stopped. When the motor 1 stops, the first and second delay gears 17, 1
8. The cam gear 22 also stops. The above state is shown in FIG.
This is the state of the elapsed time t4 of 1 and is shown in FIG.

The first and second reset levers 103 and 104 rotate with the rotation of the cam 23 during the driving period T1, and the second planetary gear 105 rotates from the separated position P105A to the contact position P105B. And meshes with the seesaw gear portion 42a.

Subsequently, a duty drive voltage in the CCW direction is applied to the motor 1. The application period of this drive voltage is
Time T2. When the motor 1 is driven in the CCW direction, the sun gear 10 rotates in the CCW direction via the gear 9, and the carrier 12 and the first planetary gear 13 rotate in the CCW direction. In this period, the first delay gear 17 rotates in the CW direction and the drive pin 17a moves in the elongated hole 18b, so that the first delay gear 17 idles, and the second delay gear 18
Since it is urged by the D spring, it does not rotate. Accordingly, the lens feeding cam 101 is also stopped together with the cam gear 22, and the lens frame 102 is held at the above-mentioned feeding position. And carrier 12 is CC
When rotated in the W direction, the output signal “H” of the planet PI62 is detected.

The duty driving voltage is set to a voltage that outputs a motor torque that can move the carrier 12 and the first planetary gear 13 to the abutting position and cannot move the sectors 51 and 52 from the closed position. That is, the voltage is set to a voltage that outputs a torque smaller than the urging force of the seesaw spring 43. The low-speed driving of the motor 1 in the CCW direction is continued, so that the carrier 12 contacts the stopper and the first planetary gear 1
3 comes in contact with the contact position P13B. When contacted, the drive is not performed in the sector opening direction at the duty drive voltage, so that the seesaw gear 42a and the second planetary gear 105 are locked with the backlash removed.

When locked, the output pulse (LD pulse) of the motor PI61 is no longer output, and it is recognized that the reference position before the shutter opening operation has been reached, and the motor 1 is temporarily stopped (the elapsed time in FIG. 31). (Operation state of FIG. 26 at t5).

Therefore, a full drive voltage in the CCW direction is applied to the motor 1. The driving voltage is applied for a time T3.
(Corresponding to the shutter time). Motor 1 CCW
By the full drive in the direction, the seesaw lever 42 is rotated in the CW direction, and the sectors 51 and 52 are driven in the opening direction at high speed. If it is detected that the output signal of the AE-PI 64 is “H”, it is determined that the lens opening 53 has started to open, and the counting of the shutter time T is started. If it is detected that the shutter time T has reached the predetermined T3, the driving of the motor 1 in the CCW direction is stopped.

During the rotation of the motor 1 in the CCW direction, the first planetary gear 13 is brought into contact with the second planetary gear 105 and the second planetary gear 105 is brought into contact with the seesaw gear portion 42a. Each rotation is held, and the rotation of the first planetary gear 13 is transmitted to the seesaw gear portion 42a. On the other hand, the first delay gear 17 idles in the CW direction while its drive pin 17a slides in the elongated hole 18b of the second delay gear 18. Therefore,
The lens feed cam 101 is also stopped together with the cam gear 22, and the lens frame 102 is not driven to move forward or backward.

Subsequently, the application of the drive voltage in the CW direction to the motor 1 is started. The drive voltage is applied for a period of time T4
It is. The motor 1 slightly delays the elapsed time t in FIG.
It stops at 6 and starts rotating in the CW direction. FIG.
The state at the elapsed time t6 is shown, and the sectors 51 and 52 have been rotated to the fully open end of the shutter opening 53.

FIG. 28 shows the elapsed time t7 in FIG.
3 shows the shutter closed state. In this state, the sun gear 10 rotates in the CW direction due to the rotation of the motor 1 in the CW direction, and the first planetary gear 13 rotates in the CCW direction. Since the first planetary gear 13 rotates in the CCW direction, the seesaw lever 42 moves the sector 51,
52 is driven to rotate to the closed position.

The sectors 51 and 52 are closed and the lens aperture 53 is closed.
Is closed, the carrier 12 rotates in the CW direction, the output signal of the planet PI62 switches to “L”, and comes into contact with the stopper 58. In this state, the first planetary gear 13 moves to the separated position P13A, and the engagement with the second planetary gear 105 is released. Further, the rotation of the motor 1 in the CW direction causes the first delay gear 17 to rotate in the CCW direction, and
It runs idle with respect to the delay gear 18. Then, the drive pin 17
a comes into contact with the end of the elongated hole 18b of the second delay gear 18. The above state is shown in the state of FIG. 29 at the elapsed time t8 in FIG.

Thereafter, the driving of the motor 1 in the CW direction is continued, and the first and second delay gears 17 and 18 are integrated with the CCW.
The cam gear 22 is rotated in the CW direction. The lens feeding cam 101 rotates together with the cam gear 22 to drive the lens frame 102 in the feeding direction. Further, since the reset lever 103 comes into contact with the projection 23a of the cam 23, the connection lever 104 rotates in the CCW direction, and the second planetary gear 105 moves to the separated position P105A.

After the lens frame 102 reaches the extension end (closest position) by the rotation of the lens extension cam 101 in the CW direction, the driven pin 102a is moved to the end face cam portion 101a.
The lens frame 102 returns to the initial position by descending to the end cam portion 101a corresponding to the lens retraction end position after passing through the inclined cam portion 101b.

When returning to the retracted end position of the lens frame 102, the output signal "L" of the cam PI63 is detected. This state is the state at the elapsed time t9 in FIG.
Is shown in Thereafter, the motor 1 is slightly rotated in the CW direction and stopped. Returning to the initial state of FIG. 22, the release processing by the drive mechanism of the present embodiment is terminated.

The driving mechanism of the camera according to the second embodiment is as follows.
The same effects as those of the driving mechanism of the first embodiment described above can be obtained, and the plurality of driven parts, ie, the photographing lens driving mechanism 110, can be provided by the motor 1 as a single driving source without using an actuator such as an electromagnet. The drive can be performed by switching between forward and backward movement of the lens frame 102 and opening and closing of the sectors 51 and 52 by the shutter opening and closing unit 76. Furthermore, since the cylindrical end surface cam portion 101a is used for driving the photographing lens, it is not necessary to reversely rotate the cam gear 22 to return to the lens retracted position. Therefore, the second planetary gear 105
No complicated position control by the reverse rotation of the cam gear 22 is required, and a more reliable operation can be obtained.

As described above, according to the present embodiment, (1) a driving source, a sun gear that rotates by receiving the driving force of the driving source, and a revolving around the sun gear that receives the rotation of the sun gear A planetary gear that further rotates, a first driven unit that is driven to rotate by receiving rotation at a predetermined position of the planetary gear, and a second driven unit that is driven to rotate by receiving a driving force from the sun gear. A driving unit, disposed between the sun gear and the second driven unit, for transmitting a driving force from the sun gear to the second driven unit, and driving from the sun gear; Driving force transmitting means set to a state in which the force is not transmitted to the second driven portion,
Control means for controlling the rotation direction of the sun gear and controlling the position on the revolution of the planetary gear and the direction of its rotation, wherein the sun gear is driven to rotate and the planetary gear is moved to the predetermined position. Thus, a driving mechanism for a camera can be proposed in which the driving force transmitting means does not drive the second driven portion while the first driven portion is being driven.

(2) The driving force transmitting means has two gears, one of which always meshes with the sun gear,
The camera according to (1), wherein the other gear always meshes with the second driven portion, and the two gears relatively rotate within a predetermined rotation angle and do not transmit the driving force. Can be proposed.

(3) The above (1), wherein the first driven portion and the second driven portion are a shutter opening / closing mechanism and a photographing lens driving mechanism, respectively.
The camera driving mechanism described in (2) can be proposed.

[0092]

As described above, according to the camera driving mechanism of the present invention, a plurality of driven parts can be switched and driven by a single driving source and without using an actuator such as an electromagnet. Further, it is possible to provide a mechanism having a simple configuration with little restriction on the indexing position of the driven portion.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a camera driving mechanism according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view around the first and second planetary gears in the drive mechanism of the camera according to the first embodiment.

FIG. 3 is a plan view around the first and second planetary gears in the drive mechanism of the camera according to the first embodiment, showing a state where the gears can mesh with each other.

FIG. 4 is a plan view around the first and second planetary gears in the drive mechanism of the camera according to the first embodiment, showing a state where the gears cannot mesh with each other.

FIG. 5 is a circuit diagram of an electric control circuit built in the drive mechanism of the camera according to the first embodiment.

FIG. 6 is a plan view of the drive mechanism of the camera according to the first embodiment in a reset state.

FIG. 7 is a plan view showing a state after the release of the drive mechanism of the camera according to the first embodiment.

FIG. 8 is a plan view of the driving mechanism of the camera according to the first embodiment when the taking lens is extended.

FIG. 9 shows a first example of the driving mechanism of the camera according to the first embodiment.
FIG. 4 is a plan view in a state where a planetary gear is switched and a sector is started.

FIG. 10 is a plan view of the drive mechanism of the camera according to the first embodiment in a sector open state.

FIG. 11 is a plan view of the drive mechanism of the camera according to the first embodiment in a sector closed state.

FIG. 12 is a plan view of the driving mechanism of the camera according to the first embodiment in a state in which the taking lens is extended and restarted.

FIG. 13 is a plan view of the camera driving mechanism according to the first embodiment in a state after the extension of the taking lens.

FIG. 14 is a plan view of the drive mechanism of the camera of the first embodiment in a first planetary gear switching state.

FIG. 15 is a plan view of the driving mechanism of the camera according to the first embodiment when the taking-in of the taking lens is started.

FIG. 16 is a plan view of the driving mechanism of the camera according to the first embodiment at the time of completion of retraction of the taking lens.

FIG. 17 is a plan view of the camera according to the first embodiment when the drive mechanism is returned to an initial reset state.

FIG. 18 is a time chart (first half) in a release process of the drive mechanism of the camera according to the first embodiment.

FIG. 19 is a time chart (second half) in a release process of the camera drive mechanism of the first embodiment.

FIG. 20 is a part of a flowchart of a release process of a drive mechanism of the camera according to the first embodiment.

FIG. 21 is a part of a flowchart of a release process of the camera driving mechanism according to the first embodiment.

FIG. 22 is an exploded perspective view of a camera driving mechanism according to a second embodiment of the present invention.

FIG. 23 is a plan view of the drive mechanism of the camera according to the second embodiment in a reset state.

FIG. 24 is a plan view showing a state after the release of the drive mechanism of the camera according to the second embodiment.

FIG. 25 is a plan view of the drive mechanism of the camera according to the second embodiment when the taking lens is extended.

FIG. 26 is a plan view of the drive mechanism of the camera according to the second embodiment when the first planetary gear is switched and the sector is started.

FIG. 27 is a plan view of the drive mechanism of the camera according to the second embodiment in a sector open state.

FIG. 28 is a plan view of the drive mechanism of the camera according to the second embodiment in a sector closed state.

FIG. 29 is a plan view of the driving mechanism of the camera according to the second embodiment in a state where the photographing lens is extended and restarted.

FIG. 30 is a plan view when the drive mechanism of the camera according to the second embodiment is returned to an initial reset state.

FIG. 31 is a time chart in a release process of the drive mechanism of the camera according to the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Motor (drive source) 10 ... Sun gear 13 ... First planetary gear 17 ... First delay gear (one gear of drive power transmission means) 18 ... Second delay gear (of drive power transmission means) The other gear) 22 cam gear (connecting member) 72 delay drive mechanism (drive force transmitting means) 76 shutter opening / closing mechanism (first driven part) 77 photographing lens drive mechanism (first 2 driven part)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G03B 9/40 G03B 17/00 W 17/00 G02B 7/04 E

Claims (3)

[Claims] A driving source; a sun gear that rotates by receiving a driving force from the driving source; a planetary gear that revolves around the sun gear and further rotates by receiving rotation of the sun gear; A first driven unit that is driven to rotate by receiving rotation at a predetermined position of the planetary gear; a second driven unit that is driven to rotate by receiving a driving force from the sun gear; Placed between the two driven parts,
A state for transmitting the driving force from the sun gear to the second driven portion and a state for not transmitting the driving force from the sun gear to the second driven portion are set. And a driving force transmitting unit. The driving force transmitting unit includes a driving force transmitting unit, wherein the sun gear is rotationally driven and the planetary gear drives the first driven unit at the predetermined position. A driving mechanism for a camera, wherein the driven part is not driven. 2. The driving force transmitting means has two gears, one of which is always meshed with the sun gear, and the other of which is always in direct contact with the second driven part, or 2. The camera driving mechanism according to claim 1, wherein the two gears mesh with each other via a connecting member, and the two gears relatively rotate within a predetermined rotation angle and do not transmit the driving force. 3. The camera according to claim 1, wherein the first driven portion and the second driven portion are a shutter opening / closing mechanism and a photographing lens driving mechanism, respectively. Drive mechanism.