JPH10161217A - Camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a camera compact by providing it with a differential gear mechanism transmitting the driving force of a single motor to a set driving system and a driving system for changing a focal distance. SOLUTION: This camera is provided with a W gear 10 coupled to a film winding-up mechanism, an RW gear 11 coupled to a film rewinding mechanism and a mirror frame gear 12 coupled to a mirror frame driving mechanism driving a mirror frame having a photographing lens. The mirror frame driving mechanism is separated to two driving systems of the set driving system for driving the photographing lens mirror frame between a collapsibly mounted position and a photographing preparing position and the zoom driving system for driving the change of a focal distance after a set driving action. Then, a set driving gear 18 is coupled to the set driving system and a zoom driving gear 20 is coupled to the zoom driving system. The gear 12 is coupled to the differential gear mechanism 14 consisting of plural gear arrays through an idle gear 13. Then, the single motor 1 is used as a driving source and the set driving and the zoom driving of the photographing mirror frame are automatically switched and driven by the gear mechanism 14 and the mechanism of the mirror frame.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera having a photographing lens drive switching mechanism, and more particularly, to a camera in which a photographing lens set drive and a focal length changing drive are performed by a single rotary drive source.

[0002]

2. Description of the Related Art A mechanism for switching drive transmission of a driving force from one motor to set driving of a photographing lens from a retracted position to a focal point switching position and to focal length changing driving to switch focal lengths is disclosed in the present application. Japanese Patent Application No. Hei 7-
No. 113409 is proposed.

This clutch switching mechanism has a plurality of planetary gear mechanisms for revolving around a sun gear driven to transmit rotational power by a motor, and a plunger for locking the revolution of the planetary gear at a predetermined position. It has a mechanism. Driven gears for set drive and focal length change drive are arranged at positions where they mesh with each other in the revolution range of the planetary gear, and the power of the plunger is switched on and off to lock the revolution of the planetary gear. -By releasing the gear, the planetary gear meshes with the desired driven gear, and the power of the motor is switched to be transmitted to each driven gear.

[0004]

In the camera of the transmission switching mechanism as described above, since each driven gear must be arranged around the revolution of the planetary gear, a large space is required, and it is difficult to reduce the size of the camera. There is.

In addition, during the period from the collapsed state to the photographable state, it takes time for the clutch switching operation such as the revolving movement of the planetary gear, switching on / off of energization of the plunger, and response operation of the plunger. There is a problem that a time lag becomes large with respect to the switching operation.

Further, an operating sound of the plunger is generated,
There is also a problem that the photographer is harsh. The present invention has been made in order to solve the above-described problems, and in a camera that drives a taking lens in a collapsible region and a focal length changing region by an electric drive source, a time from a collapsible state to a photographable state is reduced. By doing so, you do not miss a photo opportunity, and another drive source such as a plunger is not required for clutch switching,
It is an object of the present invention to provide a camera that does not cause harsh sounds of clutch switching and that can further reduce the size of a photographing lens.

[0007]

According to the first aspect of the present invention, there is provided a first camera which moves between a photographing ready position at which photographing is possible and a storage position which is housed in the main body, and further moves from the photographing ready position. A camera having a photographic lens capable of performing a focal length changing operation for changing a focal length, a single rotational drive source for driving the photographic lens, and set driving means for driving the photographic lens to perform a set operation. A focal length changing drive unit that drives the photographing lens to perform a focal length changing operation; and a differential gear mechanism that transmits the driving force of the rotary drive source to the set driving unit and the focal length changing drive unit. Is provided.

The second camera according to the present invention, in the first camera, is a focal length change preventing mechanism for preventing the driving of the focal length changing drive means during the setting operation, and during the focal length changing operation. Has set preventing means for preventing the set driving means from being driven.

A third camera according to the present invention further comprises a set driving mechanism for moving the taking lens between a photographing ready position at which photographing can be performed and a storage position housed in the main body, and further moving the taking lens from the photographing ready position. A focal length changing mechanism for moving and changing the focal length, a single rotary driving source for driving the photographing lens, and transmitting a driving force of the rotary driving source to the set driving mechanism and the focal length changing driving mechanism. The driving of the focal length changing drive mechanism is kept in a blocking state during the set driving of the photographing lens by the differential gear mechanism and the rotary drive source, and the setting is performed during the driving of the focal length changing drive by the rotary drive source. A drive blocking means for maintaining the drive mechanism in a blocking state, and an upper drive when the drive from the storage position by the set drive mechanism to the shooting preparation position is near the end of the shooting preparation position. The drive of the set drive mechanism is stopped and the blocking of the drive of the focal length changing drive mechanism is released, and the drive from the focal length change area by the focal length change drive mechanism to the shooting preparation position near the end of the shooting preparation position. In this case, there is provided a drive inhibition switching mechanism for canceling the drive inhibition of the set drive mechanism by setting the drive of the focal length changing drive mechanism to an inhibited state.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a main part plan view showing a drive switching mechanism for each driven mechanism of the camera according to the embodiment of the present invention. FIG. 2 is a main part perspective view showing a detailed configuration of the differential gear mechanism in FIG.

The camera according to the present embodiment is configured such that a plurality of driven mechanisms can be driven by a motor 1 which is an electric rotary drive source. That is, as shown in FIG. 1, the driven mechanism includes a W gear 10 connected to a winding mechanism for film winding, an RW gear 11 connected to a rewinding mechanism for film rewinding, and a lens frame having a photographic lens. It has a lens frame gear 12 connected to a lens frame drive mechanism to be driven.
The lens frame drive mechanism is further separated into two drive systems: a set drive that drives the taking lens barrel between a retracted position and a shooting preparation position, and a zoom drive that performs a focal length change drive after the set drive. Set drive gear 1 for set drive system
8, a zoom drive gear 20 is connected to the zoom drive system.

A sun gear 2 meshes with the motor 1, and a planetary gear 4 rotatably supported by a gear arm 3 rotatably provided on a rotation shaft 5 of the sun gear around the sun gear 2. So they are engaged. The W gear 10,
The RW gear 11 and the lens frame gear 12 are arranged so as to mesh with the planetary gear 4. At both ends of the rotation area of the gear arm 3 that rotates together with the revolution of the planetary gear 4, stoppers 6 and 7 that abut the gear arm 3 and regulate the rotation range are fixed. The planetary gear 4 is engaged with the W gear 10 when the gear arm 3 is in contact with the stopper 6, and the planetary gear 4 is engaged with the lens frame gear 12 when the gear arm 3 is in contact with the stopper 7. In the right position.

Further, a plunger 8 having a movable stopper 8a drivable so as to be able to enter and retract in the rotation locus of the gear arm 3 is provided. When energized, the plunger 8 sets the movable stopper 8a in a retracted state from the rotation locus of the gear arm 3, and when not energized, sets the movable stopper 8a in a state of intruding on the rotation locus of the gear arm 3. And
When the movable stopper 8a enters, the gear arm 3 is locked in the state of B shown in FIG. 1 at the position where the planetary gear 4 meshes with the RW gear 11, and the gear arm 3 is brought into contact with the stopper 7 ( 1 (state C shown in FIG. 1).

In the vicinity of the fixed stopper 7, a PI (photo interrupter) 9 is disposed, and only when the gear arm 3 is in a contact position with the stopper 7, the light path of the PI 9 is blocked. The orbital position of is detected.

The lens frame gear 12 is connected via an idle gear 13 to a differential gear mechanism 14 comprising a plurality of gear trains. As shown in FIG. 2, the differential gear mechanism 14 applies a rotational driving force connected and input to an input gear 15 a as an input system,
Set output gear 17 and Z output gear 1 which are two output systems
9d.

The detailed configuration of the differential gear mechanism 14 will be described with reference to FIG. The input gear 15a meshes with the lens frame gear 12 through the idle gear 13 to which the rotational driving force of the motor 1 is transmitted via the planetary gear mechanism including the sun gear 2 and the planetary gear 4 described above.

The sun gear 15, which is integrally formed with the input gear 15a and is rotated coaxially, has three planetary gears 16a, 16b, 16c meshed therearound. The planetary gears 16a to 16c are Each of the set output gears 17 meshes with an internal tooth 17a forming one of the gears. The differential gear mechanism 14 has a set output gear 17 having an internal tooth 17a.
And a ring-shaped gear having external teeth 17b. The external gear 17b, which is the other output gear, is driven by a lens frame setting mechanism that drives a photographing lens frame between a retracted position and a photographing preparation position. A set drive gear 18 for transmitting a force is engaged. The planetary gears 16a to 16c that mesh one of the output gears with the internal teeth 17a respectively are provided on the support shaft 1 thereof.
9a, 19b, and 19c, each of which is rotatably mounted. Each of the support shafts 19a to 19c is attached to a Z carrier 19 as a zoom drive system output gear disposed above the set output gear 17. The base ends are fixedly planted at equal intervals on the same circumference of the gear. The Z carrier 19 is provided with a Z output gear 19d.
Is engaged with a zoom drive gear 20 for zooming the photographing lens barrel.

The differential gear mechanism 1 configured as described above
When the sun gear 15 is driven by the lens frame gear 12, the rotation of the sun gear 4 is transmitted to the planetary gears 16a to 16c.
Here, when the zoom drive gear 20 connected to the Z carrier 19 having the Z output gear 19d is restrained, the planetary gears 16a to 16c rotate around the respective support shafts 19a to 19c, whereby the set output gear 17 is rotated. Rotates, the set drive gear 18 meshing with the external teeth 17b rotates, and the set frame 32 (one member of the lens frame that drives the photographing lens frame between the retracted position and the photographing preparation position). (To be described later).

On the other hand, when the restraint of the zoom drive gear 20 connected to the Z carrier 19 having the Z output gear 19d is released and the set drive gear 18 is restrained, the planetary gear 16
a to 16c rotate along the inner teeth 17a of the set output gear 17 while rotating around the support shafts 19a to 19c.
Orbit around. Therefore, each support shaft 19a-19c
Also move with the movement of the planetary gears 16a to 16c, whereby the Z carrier 19 rotates and the Z output gear 19
Drive the zoom drive gear via d.

Next, the operation of the drive switching mechanism for each of the plurality of driven mechanisms of the camera shown in FIG. 1 will be described. In FIG. 1, when the gear arm 3 is in a state A shown by a solid line,
When the sun gear 2 is rotated in the CCW direction (counterclockwise direction) by the motor 1, the gear arm 3 is kept in contact with the stopper 6, and the planetary gear 4 is rotated by meshing with the W gear 10 to wind the film. Drive. At this time, the optical path of the PI 9 for detecting the position of the planetary gear is not shielded by the gear arm 3, and the output signal of the PI 9 is ON.

Next, when the sun gear is rotated in the CW direction (clockwise) from the above-described winding drive position and the plunger 8 is kept in a non-energized state, the gear arm 3 is turned off.
Rotates clockwise and comes into contact with the movable stopper 8a of the plunger 8. The planetary gear 4 rotates while meshing with the RW gear 11, and is driven to rewind the film. In addition,
At this time, the output signal of PI9 is ON.

In the above-described hoisting drive state indicated by the solid line in FIG. 1, the plunger 8 is energized to retract the movable stopper 8a from the orbital area of the gear arm 3 and rotate the sun gear 2 in the CW direction. The gear arm 3 rotates clockwise to block the light path of PI9 and
When I9 detects the output of the OFF signal, the driving of the motor 1 is stopped and the plunger 8 is de-energized almost at the same time.
The movable stopper 8a is made to reenter the trajectory of the gear arm. As a result, the position of the gear arm 3 is restricted by being sandwiched between the stopper 7 and the movable stopper 8a.
Therefore, the planetary gear 4 is held in a state of being engaged with the lens frame gear 12, and in this state, the drive of the lens frame gear 12 can be transmitted in both the CCW and CW rotational directions. The driving force transmitted to the lens frame gear 12 is transmitted to the set driving gear 18 and the zoom driving gear 20 via the differential gear mechanism 14.

Next, the photographing lens barrel of the camera of the present embodiment driven by the driving force transmitted to the lens frame gear 12 will be described. 3 to 5 show the configuration of the taking lens barrel of the camera according to the present embodiment. FIG. 3 is an exploded perspective view of the taking lens barrel viewed obliquely from the front.
Is a developed view of each frame constituting the present lens barrel as viewed from the inside, and FIG. 5 is a sectional view of the present lens barrel. FIG. 6 is a partially developed view showing an operation state of a main part of the lens barrel.

A flange portion 3 which is attached to the camera body 30 as a base material of the entire photographing lens barrel and serves as an attachment surface
1 a has a fixed frame 31. Three rectilinear guide holes 31b along the optical axis direction are provided on the cylindrical surface of the fixed frame 31, and rectilinear grooves 31 along the optical axis direction are formed on the inner peripheral surface of the cylinder.
c1 and a cam groove 31c having three bottomed grooves, which are continuous with the rectilinear groove 31c1 and have a circumferential groove 31c2 along the circumferential direction.
Is provided. Bayonet claws 31d are provided on the front side of the fixed frame 31, and three bayonet claws 31e are planted on the circumference of the front end portion having a smaller step diameter in front of the fixed frame 31. .

The set frame 32 has a gear portion 32 on the rear circumference.
a, three cam grooves 32b with bottoms, a bayonet groove 32c composed of bottomed grooves, and three bayonet mounting grooves 32d on the inner periphery.

The moving frame 33 has three engaging pins 3 on its circumference.
3a and three cams 33b, and three straight grooves 33c along the optical axis direction on the inner peripheral surface. Moving frame 3
The three bayonet claws 33 on the circumferential surface near the tip of
d is projected and implanted.

The zoom frame 34 has three cam pins 34a and one engagement pin 34b at the rear part on the circumference, and has three rectilinear grooves 34c and bayonet grooves 34d each having a bottomed groove on the inner peripheral surface. Have.

The zoom gear frame 35 is a cylindrical member having a gear portion 35a.
b is projected rearward. A straight guide groove 35c is provided in the guide arm 35b along the optical axis direction. Three bayonet grooves 35d are provided in the cylindrical inner surface of the zoom gear frame 35.

The float key 36 has three engaging pins 36a at the rear part on the circumference and a linear guide part 36 extended at the front part.
b and 36c further have a bayonet groove 36d on the circumferential surface.

The cam frame 37 has three engaging pins 37a at the rear on the circumferential surface, and three projecting bayonet claws 37b and three bottomed cam grooves 37c and 37 on the inner circumferential surface.
d.

The 1Z frame 38 has three engaging pins 38a at the rear on the circumference. The 2G frame 39 has an engagement pin 39 on the outer surface, and has two guide shafts 39a and 39b extending in the front direction along the optical axis direction. 2G frame 39
The rear group lens G2 is fixed inside. In the 1Z frame 38, a 1G frame 41 fixedly holding the front group lens G1 is provided so as to be movable in the optical axis direction. further,
The 2G frame 39 holding the rear group lens G2 is supported by the 1Z frame 38 in a state where the guide shaft 39a and the guide shaft 39b on which the coil spring 40 is mounted are inserted and the spring is biased rearward in the optical axis direction. I have.

The configuration of the taking lens barrel incorporating the above-described members will be described with reference to FIGS. The set frame 32 is attached in a state where the bayonet groove 32c is inserted into the bayonet claw 31d of the fixed frame 31. The set frame 32 is radially fitted to the outer periphery of the fixed frame 31 and is supported so as to be rotatable only. . The set drive gear 18 of the drive force transmission drive mechanism from the motor 1 is connected to the gear portion 32a of the set frame.

The engaging pin 33a of the moving frame 33 is engaged with the straight guide groove 31b of the fixed frame 31, and the outer peripheral surface of the rear portion of the moving frame 33 is radially fitted to the inner periphery of the fixed frame 31. Further, the engagement pin 33a is connected to the cam groove 32b of the set frame 32.
Is engaged.

Therefore, when the set frame 32 is rotated, the movable frame 33 is moved to the engagement pin 33a engaged with the linear guide groove 31b.
Moves straight along the optical axis direction. When the engaging pin 33a of the moving frame 33 comes into contact with the front or rear end of the linear guide groove 31b, the further rotation of the set frame 32 is locked.

On the inner periphery of the fixed frame 31, a zoom gear frame 35 is provided.
Are fitted into the bayonet claw 31e and the bayonet groove 35
The zoom gear frame 35 is only rotatable with respect to the fixed frame 31. In addition, due to space, the zoom gear frame 35 is fixed to the fixed frame 31.
The rotation axis is slightly eccentric with respect to. The zoom drive gear 20 of the drive mechanism for transmitting the driving force from the motor 1 described above is connected to the gear portion 35a of the zoom gear frame 35.

A zoom frame 34 is fitted around the outer periphery of the moving frame 33 so that the bayonet groove 34 is inserted into the bayonet claw 33d. The zoom frame 34 is integrated with the moving frame 33 in the optical axis direction. To be relatively rotatable. The outer peripheral surface of the zoom frame 34 is fixed to the fixed frame 31.
And the cam pin 34a is engaged with the regulating cam groove 31c. Further, the engagement pin 34b of the zoom frame 34 is engaged with the straight guide groove 35c of the zoom gear frame 35.

Therefore, when the zoom gear frame 35 rotates, the zoom frame 34 also rotates integrally. However, the zoom frame 3 engaged with the regulating cam groove 21c of the fixed frame 31
When the fourth engagement pin 34a is located at the position of the rectilinear groove 21c1, the zoom gear frame 35 is restricted from rotating. Then, the engaging pin 34a of the zoom frame 34 is
When the zoom gear frame 35 is located at the position 1c2, the zoom gear frame 35 is rotatable.

A cam frame 37 is radially fitted on the inner peripheral surface of the moving frame 33, and an engaging pin 37a of the cam frame 37 penetrates and engages with the cam 33b. The pin 37a is engaged with the rectilinear groove 34c of the zoom frame 34. A float key 36 is radially fitted to the inner peripheral surface of the cam frame 37, and is attached at a predetermined position in the optical axis direction by a bayonet structure. The float key 36 has its engaging pin 3
6a is engaged with the rectilinear groove 33c of the moving frame 33. Therefore, since the float key 36 can move straight with respect to the fixed frame 31 and the cam frame 37 can rotate with respect to the float key 36, they move integrally in the optical axis direction.

Therefore, when the zoom gear 35 is rotated,
The zoom frame 34 moves integrally with the moving frame 33 along the optical axis while rotating integrally, and the cam frame 37 rotates along with the rotation of the zoom frame 34 in the optical axis direction. Moves integrally with the float key 36.

A 1Z frame 38 is provided in the cam groove 37c of the cam frame 37.
Of the 2G frame 3 is engaged with the cam groove 37d.
Nine engagement pins 39c are engaged. Float key 36
The two side surfaces of the two projections 38b and 38c provided on the inner peripheral surface of the 1Z frame 38 abut on one side surface 36b1 and 36c1 of the linear guide portions 36b and 36c provided on the bottom surface. The 1Z frame 38 is guided so as to move linearly with respect to 36. Therefore, the cam frame 3
When 7 rotates, 1Z frames 38 and 2 containing 1G frame 41
The G frame 39 moves in the optical axis direction along each cam groove, and changes the distance between the front group lens G1 and the rear group lens G2 to change the focal length of the photographing lens.

A shutter mechanism (not shown) and a drive mechanism for moving the 1G frame 41 in the optical axis direction within the 1Z frame 38 are provided inside the 1Z frame 38. Next, the operation when the photographing lens frame mechanism is driven by the driving force transmission mechanism having the above-described differential gear mechanism will be described with reference to FIGS. 2, 5, and 6. FIG.

When the photographing lens barrel is driven, the driving force of the motor 1 is transmitted to the lens frame gear 12 as described above. The driving force of the lens frame gear 12 is controlled by the differential gear mechanism 1.
4 and is transmitted to the set drive gear 18 and the zoom drive gear 20 as two outputs from the differential gear mechanism 14. Here, the driving force of the set driving gear 18 is input to the set frame 32, and the driving force of the zoom driving gear 20 is input to the zoom gear frame 35, and each of them is rotated.

FIG. 5 shows a state in which the photographing lens is extended from the retracted retracted position to the photographable position, and is further extended to a maximum focal length, zoomed from a wide-angle position to a telephoto position. Normally, when the camera is not turned on when carrying, for example, when the taking lens is in the retracted position, the moving frame 33, the zoom frame 34, the float key 36,
The cam frame 37, the 1Z frame 38, the 1G frame 41, the 2G frame 39, and the like are moved rearward in the optical axis direction and are accommodated in the fixed frame 31.

FIG. 6 is an exploded view of a main part in each state of the photographing lens barrel in each state as viewed from the inside. FIG. 6 shows (a) the retracted position,
(B) shows a wide-angle focal length position, and (c) shows a telephoto focal length position.

First, a description will be given of a set-up operation drive for driving the above-described photographing lens frame from the retracted state to the photographing preparation position where photographing is possible. When the lens frame gear 12 is rotated in the CW direction by the driving force of the motor 1, the differential gear mechanism 1
The rotational force can be transmitted to the set driving gear 18 and the zoom driving gear 20 as an output via the motor 4, and the set frame 32 and the zoom gear frame 35 are to be rotated. However, FIG.
(A), the zoom frame 34 that is rotated integrally with the zoom gear frame 35 is
Since the cam pin 34a engaging with c is located in the area of the straight groove 31c1, it cannot rotate. Therefore, the zoom gear frame 35 cannot be rotated and is in a locked state.

In this state, the rotation of the zoom drive gear 20 of the two output gears of the differential gear mechanism 14 is locked, so that the rotation of the motor 1 is limited to the set drive gear 18 by the differential gear mechanism 14. The driving force will be transmitted.

When the set drive gear 18 is driven to rotate,
The set frame 32 connected to this rotates. Moving frame 33
The engagement pin 33a is fixed to the straight guide hole 31b of the fixed frame 31.
, And the cam pin 34 a of the zoom frame 34 is engaged with the rectilinear groove 31 c 1 of the fixed frame 31. Accordingly, the rotation of the set frame 32 causes the moving frame 33 to move straight forward with the zoom frame 34 along the optical axis direction. At this time, when the moving frame 33 moves in the optical axis direction, the float key 36, the cam frame 37, the 1Z frame 38, and the like also move integrally at the same time.

Then, the moving frame 33 moves forward, and immediately before the setup operation as the photographing preparation operation is completed, the engagement pin 33a is moved to the straight guide hole 31b of the fixed frame 31.
The forward movement of the moving frame is locked by contacting the front end of the moving frame.
As a result, the set frame 32 cannot rotate, and
Further, the rotation of the set drive gear 18 connected to rotate the set frame 32 is locked.

On the other hand, immediately before the end of the set-up operation, the cam frame 34a is engaged with the rectilinear groove 31c1 of the fixed frame 31 at the time of starting the set-up drive, and the rotation of the zoom frame 34 is restricted. FIG.
(B) is a position indicated by a dotted line, and the rotation is allowed.

Therefore, among the two output gears of the differential gear mechanism 14, the rotation of the set driving gear 18 is locked, so that the rotational driving force of the motor 1 is transmitted only to the zoom driving gear 20 by the differential gear mechanism 14. It is switched to be performed.

As a result, the zoom gear frame 35 connected to the zoom drive gear 20 is rotated, and the cam pin 34a of the zoom frame 34 is moved to the position shown in FIG. When the motor 1 reaches the end, the motor 1 is stopped as described later, and the setup operation ends.

Next, a description will be given of a zoom-up operation drive for further changing the focal length of the photographing lens frame and performing a zoom operation toward the telephoto focal length side in the above-described setup operation end state.

As described above, when the set-up operation is completed, the rotation of the set drive gear 18 of the two output gears of the differential gear mechanism 14 is locked. Only the rotational driving force of the motor 1 is transmitted.

Thus, when the lens frame gear 12 is rotated in the CW direction in the same direction as the setup operation by the driving force of the motor 1, the zoom gear frame 35 is rotated by the zoom drive gear 20. The zoom frame 34, which is rotated integrally with the zoom gear frame 35, does not move in the optical axis direction, but rotates with respect to the moving frame 33 on the spot. With the rotation of the zoom frame 34,
The cam frame 37 moves forward while rotating, and the front group lens G1
The focal length is changed by changing the distance between the 1Z frame 38 having the 1G frame 41 to which is fixed and the 2G frame 39 to which the rear group lens G2 is fixed. Then, as the zoom-up operation is continued, as shown in FIG. 6C, the cam pin 34a of the zoom frame 34 is moved while the engagement pin 33a of the moving frame 33 is kept in contact with the end of the straight guide 31b. It is moved in the circumferential direction along the circumferential groove 31c2 and reaches the telephoto end (T end). FIG. 5 shows the state of the entire photographing lens barrel that has reached the end of the focal length on the telephoto side (T end).

Next, from the state shown in FIG. 6C, a zoom-down operation of changing the focal length of the taking lens barrel and performing a zoom operation to the wide-angle focal length side as shown in FIG. 6B. The driving will be described.

The lens frame gear 12 is rotated by the driving force of the motor 1 in the CCW direction opposite to the direction of the setup and zoom-up operation. At this time, the cam pin 34 of the zoom frame 34
Since a is located at the position of the circumferential groove 31c2 of the fixed frame 31, and the movement of the zoom frame 34 in the optical axis direction is restricted, the zoom frame 34 and the moving frame 33 cannot move in the optical axis direction. Therefore, the set frame 32 cannot rotate, and the set drive gear 18 is in a state where the rotation is locked.

In this state, the rotation of the set drive gear 18 of the two output gears of the differential gear mechanism 14 is locked.
The rotational driving force of the motor 1 is transmitted only to 0.

The zoom drive gear 20 includes a zoom gear frame 35
Is rotated in the direction opposite to that at the time of zooming up. This allows
By rotating the zoom frame 34 integrally with the zoom gear frame 35, the zoom drive is performed to the wide-angle focal length side in a direction opposite to that during the zoom-up operation. Then, when the W end is detected, the motor 1 is automatically stopped, and the state of FIG.

Next, a description will be given of a set-down operation drive for driving the photographing lens frame from the W end position, which is also a photographing ready position where photographing is possible, to the retracted state position. When the lens frame gear 12 is driven in the same direction (CCW) as the above-described zoom-down operation, the zoom frame 34 is rotated, and the cam pin 34a is moved from the position indicated by the solid line to the position indicated by the dotted line in FIG. To abut on the rotation restricting wall of the rectilinear groove 31c1 of the fixed frame 31. Then, the zoom frame 34 and the zoom gear frame 35 cannot rotate any more. At this time, the cam pins 34a of the zoom frame 34 are
Since it can be moved along the optical axis along c1, the set frame 3
2 is in a rotatable state.

Accordingly, since the zoom drive gear 20 connected to the zoom gear frame 35 is locked and cannot be rotated,
The driving force of the motor 1 is transmitted to the set driving gear 18 connected to the set frame 32 via the differential gear mechanism 14.

When the set driving gear 18 is driven to rotate,
The set frame 32 connected to this rotates. Moving frame 33
The engagement pin 33a is fixed to the straight guide hole 31b of the fixed frame 31.
, And the cam pin 34 a of the zoom frame 34 is engaged with the rectilinear groove 31 c 1 of the fixed frame 31. Accordingly, the rotation of the set frame 32 causes the moving frame 33 to move straight back together with the zoom frame 34 along the optical axis direction. At this time, when the moving frame 33 moves in the optical axis direction, the float key 36, the cam frame 37, the 1Z frame 38, and the like also move integrally at the same time.

Then, the moving frame 33 moves rearward, and the engaging pin 33a moves to the straight guide hole 31b of the fixed frame 31.
When the rearward movement of the moving frame is stopped by contacting the rear end stopper, or immediately before, the motor is stopped, the retracted state shown in FIG. 6A is reached, and the set-down operation is completed.

In the above embodiment, the set frame 3
In order to restrict the rotation of the movable frame 2, the engaging pin 33 a of the movable frame 33 is engaged with the linear guide hole 31 b provided in the fixed frame 31.
Are fixed at both ends of the rectilinear guide hole, but a stopper may be provided on the fixed frame 31 to directly contact the set frame 32 to restrict the rotation of the set frame 32.

Next, drive control of the camera and the photographic lens barrel of the present embodiment will be described with reference to FIGS. FIG. 7 is a block diagram showing a control circuit relating to the taking lens barrel of the camera of the present embodiment. FIGS. 8 and 9 are flowcharts showing drive control of the photographing lens barrel, and FIGS. 10 and 11 are timing charts thereof. FIG.
1 indicates set-down driving. As shown in FIG. 7, the lens barrel drive control circuit of the present embodiment has a control circuit 51 configured to include a microcomputer and the like. This control circuit 5
1 is connected to a motor drive control circuit 52 and a plunger drive control circuit 53 for controlling the drive of a drive source such as the motor 1 and the plunger 8. In addition, the control circuit 51 includes a PI (photo interrupter) for detecting whether the rotation position of the gear arm 3 is at a position where the planetary gear 4 meshes with the lens frame gear 12 as shown in FIG. Are connected.

Further, the following various switches are connected to and controlled by the control circuit 51. Power SW (PW
SW) 55 is an operation switch for turning ON / OFF the power supply of the camera. Zoom up SW (ZUSW)
Reference numeral 56 and a zoom down switch (ZDSW) 57 are operation switches for performing a zoom operation.
By operating the zoom lens 6, the motor 1 changes the zoom focal length of the photographing lens from the wide angle to the telephoto side, and operates the zoom down SW 57 to change the zoom focal length from the telephoto to the wide angle side.
Is drive-controlled. Further, the W-end SW (ZWSW) 58 and the T-end SW (ZTSW) 59 stop the zoom drive at both ends of the zoom region during the above-described zoom drive, that is, at the W end (wide-angle end) and the T end (telephoto end). Switch provided for the photographing lens barrel. W
The terminal SW 58 is turned on when the setup drive is completed,
The T-end SW 59 is provided so as to be turned on when the zoom operation is performed and the telephoto end is reached. Collapse end SW
(CSW) 60 is for detecting whether or not the taking lens barrel is in the retracted state. Release SW (R
SW) 61 is for starting a photographing sequence of the camera. When it is turned on, the shutter 54 is driven to expose the film surface, and the film is further wound up by one frame. In FIG. 7, a flash emission lighting device, a distance measuring device, and the like necessary for the camera are omitted, but they are controlled by the control circuit 51.

The motor 1 drives the lens frame such as a set operation between the retracted position and the W end position at which the photographing lens frame can be photographed and a zoom operation between the W end and the T end, and also winds up the film. And a drive source for performing rewinding.

Next, the drive control operation of the taking lens barrel of the camera according to the present embodiment will be described with reference to FIGS. 1, 10 and 11 based on the flowcharts of FIGS.

First, the power switch 55 is turned on by the photographer.
When operated (S1), it is checked whether the PI 9 is in the OFF state (S2). When the planetary gear 4 provided on the gear arm 3 is in mesh with the lens frame gear 12, the PI 1 is in the OFF state, so that the motor 1
(S3). At this time, since the plunger 8 is in the OFF state, the gear arm 3 is held by the stopper 7 and the movable stopper 8a of the plunger 8 while the planetary gear 4 is engaged with the lens frame gear 12.
Since the lens frame gear 12 is driven to rotate in the CW direction by the rotation of the motor 1 in the CW direction, the photographing lens is driven to set up from the retracted position. Then, it is detected whether or not the setup has reached the completion state, that is, whether or not the W-end SW 58 is ON (S4). Then, the W-end SW 58 is turned on in S4.
, The motor 1 is turned off and stopped (S
5). At this time, in order to further stop the lens frame accurately at the W end, the voltage supplied to the motor 1 may be controlled or the motor 1 may be controlled by applying a brake or a reverse rotation brake.

In S2, when the PI 19 is ON, that is, when the planetary gear 4 is in mesh with the W gear 10 or the RW gear 11, the plunger 9 is turned ON.
Then, the movable stopper 8a is once retracted from the rotation area of the gear arm 3 (S7). Then, the motor 1 is rotated in the CW direction (S8), and the gear arm 3 is rotated to rotate the PI 19
The change of the signal from ON to OFF is detected (S9).
When the signal of PI 19 is turned off in S9, the motor 1 is turned off and stopped (S10), and the plunger 8 is turned off.
Is turned off (S11), and the planetary gear 4 is
Then, the process proceeds to S3.

When the power switch 55 is turned on by the above-described drive control, the photographing lens frame is set-up driven from the retracted state and is brought out to the W end (wide-angle focal length end) position where photographing is possible.

Next, a case where the photographing lens barrel is set-down driven will be described. In the setup completion state in S6, it is next checked whether or not the state of the power SW 55 is ON (S12). In S12, the power SW
If 55 is kept in the ON state, zoom up S
It is checked whether W56 is ON (S23),
When the zoom-up switch 56 is ON, zoom-up driving is performed (S28).
And returns to S12.

If the zoom-up switch 56 is off at S23, it is checked whether the zoom-down switch 57 is on (S24). If the zoom-down switch 57 is on, zoom-down driving is performed (S29), and the W-end switch SW5
When 8 is turned on, the motor 1 is stopped, and the process returns to S12.

At S24, the zoom down switch 57 is turned off.
Then, it is checked whether or not the release SW 61 is ON (S25). If the release SW 61 is ON, the shutter is driven to perform an exposure operation to perform photographing (S26), and after the exposure is completed, the film is driven up by one frame (S27), and the photographing sequence is terminated and S1 is performed.
Return to 2.

In step S12, the power switch 55 is turned on and turned off.
When it changes to F, it is first checked whether the PI 19 is OFF (S13). If the PI 19 is ON, the plunger 8 is turned ON (S18), and the motor 1 is rotated in the CW direction (S19). ), The planetary gears 4
Orbit in the direction to mesh with. And PI19 is OFF
It is again checked whether or not it has been performed (S20), and
If FF is detected, motor 1 is stopped (S2
1) Then, the plunger 8 is turned off (S2
2) After the planet gear 4 is held in a state of meshing with the lens frame gear 1, the process proceeds to S14.

If the PI 19 is turned off in S13, the motor 1 is rotated in the CCW direction (S14).
The lens frame is driven to the collapsed state. And, retractable end SW60
It is checked whether or not is turned ON (S15).
If 0 is turned on, the motor 1 is turned off and stopped (S16), and the lens frame is retracted to end the drive (S16).
17).

According to the photographing lens frame driving mechanism of the camera of the embodiment described above, the single motor 1 is used as a driving source, and the differential gear mechanism and the lens frame mechanism are used to drive the photographing lens frame. The set drive and the zoom drive can be automatically switched and driven. Further, since the drive of the differential gear mechanism is automatically switched according to the operating position of the lens frame, another actuator other than the motor is not required for switching between the two drives, and the actuator is switched. Since no driving is required, it is possible to provide a camera which can reduce the driving time from, for example, the stowed state to the photographable state, has a quiet switching sound, and is cost-effective.

[Appendix] According to the embodiment of the present invention as described in detail above, the following configuration can be obtained. That is,

(1) In a camera having a taking lens barrel for moving the taking lens so that the taking lens can be retracted and the focal length can be changed, the camera is provided on the taking lens barrel and is housed in a photographing preparation position where the taking lens can be photographed and at the main body side. A set drive mechanism for moving the image pickup lens between the storage position and a focal length changing mechanism for changing the focal length by moving the image pickup lens further from the image pickup preparation position in the variable focus area, and A single rotary drive source for driving the lens, a differential gear mechanism coupled to both mechanisms to transmit the driving force of the rotary drive source to the set drive mechanism and the focal length changing drive mechanism, Provided on the taking lens barrel, while the set driving of the taking lens by the rotary drive source, the drive of the focal length changing drive mechanism is kept in a blocking state, and the shooting is performed by the rotary drive source. Camera lenses in the focal length changing drives equipped with drive blocking means for maintaining the drive of the set drive mechanism in the blocking state, the.

(2) In Supplementary Note 1, when the drive from the storage position by the set driving mechanism to the photographing preparation position is near the end of the photographing preparation position, the driving of the set driving mechanism is set to a blocking state and the focus is adjusted. When the drive inhibition of the distance change drive mechanism is released, and when the focal length change drive mechanism reaches the vicinity of the photographing preparation position end of driving from the focal length change area to the photographing preparation position, the focal length change drive mechanism And a drive inhibition switching means for canceling the drive inhibition of the set drive mechanism in a drive inhibition state.

(3) In the supplementary note 1 or 2, the set drive mechanism is a rotatable set drive member connected to the differential gear mechanism, and the focal length changing mechanism is a rotary set drive member connected to the differential gear mechanism. A zoom driving member capable of selectively rotating the set driving member and the zoom driving member by the driving preventing means;

[0081]

As described above, the camera of the present invention has two lens frame driving mechanisms, a set driving mechanism and a zoom driving mechanism, and the photographing lens frame is moved to the collapsed area and the focal length changing area by the electric driving source. When driving with, the time from the collapsed state to the photographable state can be shortened, so that a photo opportunity can be prevented from being missed. Further, another drive source such as a plunger is not required for the clutch switching, and there is no unpleasant sound of the clutch switching, and the size of the photographing lens can be further reduced.

[Brief description of the drawings]

FIG. 1 is a main part plan view showing a drive switching mechanism for each driven mechanism in a camera according to an embodiment of the present invention.

FIG. 2 is an essential part perspective view showing a detailed configuration of a differential gear mechanism in FIG. 1;

FIG. 3 is an exploded perspective view of the taking lens barrel of the camera according to the embodiment of the present invention, as viewed obliquely from the front.

FIG. 4 is a developed view of each frame constituting the taking lens barrel of FIG. 3 when viewed from the inside;

FIG. 5 is a sectional view of the taking lens barrel of FIG. 3;

FIG. 6 is a partial development view showing an operation state of a main part of the taking lens barrel of FIG. 3;

FIG. 7 is a block diagram showing a control circuit relating to a taking lens barrel in the camera of the embodiment.

FIG. 8 is a flowchart showing drive control of a taking lens barrel in the camera of the embodiment.

FIG. 9 is a flowchart showing drive control of a taking lens barrel in the camera of the embodiment.

FIG. 10 is a timing chart at the time of setup driving in drive control of the photographing lens barrel of the camera of the embodiment.

FIG. 11 is a timing chart at the time of set-down drive in drive control of the photographing lens barrel of the camera of the embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 motor 12 mirror frame gear 14 differential gear mechanism 18 set drive gear 20 zoom drive gear 31 fixed frame 31b rectilinear guide hole 31c regulating cam groove 31c1 rectilinear groove 31c2 circumferential groove 32 set frame 32a gear section 35 zoom gear frame 35a gear section

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Koji Kato 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Co., Ltd.

Claims (3)

[Claims] 1. A set operation for moving between a photographing ready position where photographing is possible and a storage position where the main body is stored, and a focal length changing operation for further moving from the photographing ready position and changing the focal length are possible. A single rotation drive source for driving the photographing lens, set driving means for driving the photographing lens to perform a set operation, and driving the photographing lens to perform a focal length changing operation. And a differential gear mechanism for transmitting the driving force of the rotary drive source to the set drive unit and the focal length change drive unit. 2. A focal length change preventing mechanism for preventing driving of the focal length changing drive means during the setting operation, and a set preventing means for preventing driving of the set driving means during the focal length changing operation. The camera according to claim 1, comprising: 3. A set drive mechanism for moving a taking lens between a photographing ready position where photographing is possible and a storage position where the photographing lens is housed in the main body, and further moving the photographing lens from the photographing ready position to change the focal length. A focal length change mechanism, a single rotary drive source for driving the photographing lens, a differential gear mechanism for transmitting the drive force of the rotary drive source to the set drive mechanism and the focal length change drive mechanism, The drive of the focal length changing drive mechanism is maintained in a blocking state while the photographing lens is being driven to be set by the rotary drive source, and the drive of the set driving mechanism is blocked in a state where the focal length is being driven to be driven by the rotary drive source. A drive inhibiting means for maintaining the drive mechanism at a position near the end of the photographing preparation position for driving from the storage position to the photographing preparation position by the set driving mechanism. When the drive inhibition of the focal length changing drive mechanism is released in the blocking state, and when the focal length changing drive mechanism reaches the vicinity of the photographing preparation position end of driving from the focal length changing area to the photographing preparation position by the above, A camera, comprising: a drive-prevention switching mechanism that releases the drive-prevention of the set driving mechanism by setting the driving of the focal-length changing drive mechanism to a blocking state.