JPH0659175A - Adjusting structure for cam plate for guiding rear group lens of camera provided with variable focusing device - Google Patents

Abstract

PURPOSE:To provide adjusting structure for a cam plate for guiding a rear group lens where adjusting work is simplified by turnably supporting a cam plate for guiding the movement of the rear group lens of a variable focusing device, allowing a pressing means to press the cam plate so that it may be turned in one direction, providing the adjusting member so that it can freely move forward and backward in the turning area of the cam plate, and changing the direction of a cam surface by moving the adjusting member forward and backward. CONSTITUTION:A cam plate 35 is turnably supported on the inside surface of the upper wall of a fixed lens barrel 30 by a shaft part 35a. By screwing an adjusting screw 37 on the back wall of the lens barrel 30, the leading surface of the screw 37 is faced to one end of the cam plate 35. A drawing spring 36 is housed in the recessed part of the cam plate 35, and the cam plate 35 is pressed by the restoring force of the spring 36 so that its one end may be pressed to the leading surface of the screw 37. The engaging pin part 75b of a cam lever 75 linked with a rear group lens is pressed to the cam surface 35c of the cam plate 35. When the screw 37 is turned to move forward and backward, the cam plate 35 is turned in any direction by resisting the restoring force of the spring 36 or by the restoring force, so that the direction of the cam surface 35c is changed, and the moving quantity of the rear group lens is changed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera provided with a variable focus device, and a guide cam plate for guiding the movement of the rear lens group so that the focal length of the variable focus device is changed to a predetermined value. Regarding adjustment structure.

[0002]

2. Description of the Related Art A camera equipped with a variable focus device capable of changing a focal length of a photographing lens has become widespread so that a photograph can be taken in a more enjoyable, convenient and quick manner with respect to a subject. This varifocal device includes a so-called focus switching device that can switch the focal length of the taking lens between two modes, wide-angle and standard, and a zoom device that continuously switches between wide-angle and standard. A variable focus device, particularly a zoom device, includes a front lens group and a rear lens group as a photographing lens, and changes the focal length by moving the lenses of the front and rear lens groups back and forth in the optical axis direction while maintaining a predetermined optical relationship. is doing.

That is, the lenses of the front and rear groups are held by a movable lens barrel, and the movable lens barrel is slidably held by a fixed lens barrel. By sliding the movable lens barrel, the lenses of the front and rear groups are moved in the optical axis direction, and at the same time, the rear lens group is moved in the movable lens barrel while maintaining a predetermined optical relationship with the front lens group. I am doing it.

A cam mechanism such as a cam curve formed on a cam plate is used to move the rear lens group with respect to the movable lens barrel. That is, by moving the rear lens group along this cam curve, the relationship with the front lens group is maintained at a predetermined value.

Further, since the front and rear lens groups may have an error in the manufacturing process, there are cases where the desired optical relationship cannot be obtained even if the cam curve is constant. Further, the optical relationship is also changed depending on the mounting state of the cam plate forming the cam curve. Therefore, in the process of completing the camera, the direction of the cam surface of the cam plate must be adjusted so that the focal length of the taking lens changes in a predetermined manner.

A conventional adjusting mechanism for a rear lens guide cam plate of this type is to fix the cam plate at a predetermined position such as a fixed lens barrel with a set screw or the like, and a long hole formed in the fixed lens barrel. The direction of the cam surface is adjusted by adjusting the fixing position of the cam plate by shifting the set screw inside.

[0007]

However, in the above-mentioned conventional adjusting mechanism for the cam plate for guiding the rear lens group, the position of the set screw for fixing the cam plate is adjusted to adjust the direction of the cam surface. Even if the screw is slightly displaced, the direction of the cam surface changes greatly, and the adjustment work becomes complicated. Further, when tightening the set screw for fixing the cam plate, it is necessary to press the cam plate with one hand and tighten the set screw with the other hand, which results in poor workability. Moreover, even a slight change in the cam surface causes a large change in the optical relationship of the taking lens, which makes it impossible to change the focal length as desired, which further complicates the adjustment work.

Therefore, according to the present invention, the rear group of cameras with a variable focus device that can easily perform the adjustment work of the direction of the cam surface of the cam plate that guides the movement of the rear group lens and can also easily perform the fine adjustment. It is an object of the present invention to provide an adjusting structure for a cam plate for guiding a lens.

[0009]

As a technical means for achieving the above object, an adjusting structure of a cam plate for guiding a rear lens group of a camera with a variable focus device according to the present invention is held by a movable lens barrel. By sliding the movable lens barrel with respect to the fixed lens barrel, the front lens group and the rear lens group are moved in the optical axis direction while keeping the rear lens group and the front lens group in a predetermined optical relationship. In a camera with a variable focus device that includes a variable focus device that advances and retracts to change the focal length, and guides the advance and retreat of the rear group lens in the optical axis direction by a cam mechanism, the cam plate of the cam mechanism being a stationary portion of the camera An adjusting member that is rotatably supported about a direction substantially parallel to the cam surface and that is movable in the direction of rotation of the one end of the cam plate within the rotation range of the one end of the cam plate is provided on the immovable portion of the camera. And the one end of the cam plate is adjusted To rotate in a direction that is always pressing the surface of the moving direction of the wood, it is characterized in that a biasing means for biasing the cam plate.

[0010]

When the adjusting member is moved forward, the cam plate is rotated in one direction against the stored force of the biasing means. On the contrary, when the adjusting member is retracted, the cam plate is rotated in the other direction by the urging force of the urging means. Since the rotation axis of the cam plate is in a direction substantially parallel to the cam surface, the direction of the cam surface changes due to the rotation of the cam plate. Therefore, the movement of the rear lens group guided by the cam surface moves. The amount changes.
That is, the position of the cam plate can be adjusted simply by moving the adjusting member forward and backward.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An adjusting structure for a cam plate for guiding a rear lens group of a camera with a variable focus device according to the present invention will be described below with reference to an illustrated embodiment, and a camera structure suitable for having this adjusting structure. Both will be specifically described.

FIG. 11 is an exploded perspective view of the camera body 1, and as shown in the figure, a battery chamber 2 for accommodating a power supply battery is provided on one side of the camera body 1.
The spool chamber 3 is disposed adjacent to the battery chamber 2, and the cartridge chamber 4 is disposed on the side opposite to the battery chamber 2.

A spool 5 shown in FIG. 12 is rotatably accommodated in the spool chamber 3, and a film feeding motor 6 that reversibly rotates is accommodated in the spool 5. Then, a pinion 6a fitted to the output shaft of the film feeding motor 6, a winding gear train including gears 6b, 6c and 6d and gears 6e, 6f and 6g shown in FIG. The rotation of the film feeding motor 6 is transmitted to the spool 5 via the spool rotating gear 5a, and the film is wound by the rotation of the spool 5. The above gears 6f and 6g are gears 6f are sun gears,
It is composed of a planetary gear mechanism in which a gear 6g is rotatably supported by a planetary arm 6h which is rotatably supported about a rotation axis of a sun gear 6f with respect to the camera body 1, and therefore a film feeding motor. Depending on the rotation direction of 6, the planet gear 6g is disengaged from the spool rotation gear 5a. That is, the planetary gear 6g and the spool rotary gear 5a mesh with each other due to the rotation of the film feeding motor 6 during film winding.
The planet gear 6g is adapted to mesh with a rewinding gear train to be described later by rotation during film rewinding. The gears 6b, 6c, 6d of the winding gear train are pivotally supported by a gear holder 6k (see FIG. 12).

Further, as shown in FIG. 12, an initial winding gear 5b is formed on the lower edge of the spool 5, and an initial winding gear train including the initial winding gear 5b and the gears 7a and 7b shown in FIG. The rotation of the spool 5 is transmitted to the one-tooth gear 7c via the. The one-tooth gear 7c and the gear 7b are arranged coaxially, and the rotation of the gear 7b is transmitted to the one-tooth gear 7c via the buffer mechanism 7d.

An aperture 8 is formed between the spool chamber 3 and the cartridge chamber 4, and a film is located on the back side of the aperture 8. Further, the one-tooth gear 7c is arranged at a position where the lower perforation of the film set in the aperture 8 passes, and the teeth of the one-tooth gear 7c are rotated by the rotation of the one-tooth gear 7c. It is designed to disengage from perforations.

An aperture 8 is provided on the upper portion of the camera body 1.
As shown in FIG. 11, on the upper side of the gears 9a, 9b, 9c, 9d,
A rewinding gear train consisting of 9e and 9f is arranged, and the final gear 9f of the rewinding gear train meshes with the rewinding gear 9g.
A fork 4a is attached to the shaft portion of the rewinding gear 9g, and the fork 4a projects substantially at the center of the ceiling surface of the cartridge chamber 4 and the shaft end of the film cartridge loaded in the cartridge chamber 4 is attached. The part is adapted to engage with the fork 4a. A buffer spring 4b is interposed between the shaft of the rewinding gear 9a and the fork 4a so as to buffer the rotation transmitted to the shaft of the cartridge. The film feeding motor 6 for rewinding the film
The rotation of the planet gear mechanism causes the planet gear 6g of the planet gear mechanism to mesh with the gear 9a of the rewinding gear train.

A switch knob is provided on the upper surface of the camera body 1.
10 is slidably inserted in the vertical direction, and the switch knob 10
Has a lower end portion protruding from the ceiling surface of the cartridge chamber 4 by an appropriate length. Then, a contact tongue piece 10a of the film presence / absence detection switch is arranged above the switch knob 10 by being fixed by a screw 10b. That is, when a film is loaded into the cartridge chamber 4, the film cartridge comes into contact with the tip of the switch knob 10 and pushes up the switch knob 10, so that the contact tongue 10a is bent and turned on.
However, the ON signal can detect that the film is loaded.

The gears 6b, 6c, 6d, 6e, 6f, 6g constituting the hoisting gear train and the gears 9a, 9b, 9c, 9d, 9e of the rewinding gear train mounted on the camera body 1 are As shown in FIG. 12, the gear housing 13 is covered, and the gear housing 13 is fixed to the camera body 1 by the set screw 13a to hold the gears of these gear trains.

As shown in FIGS. 3 and 11, the sprocket 12 is rotated at the upper end of the aperture 8 on the rear surface of the camera body 1 and at the position where the perforation 25a of the film 25 to be fed passes. It is movably installed. The sprocket 12 is rotated by its teeth being disengaged from the perforations 25a by feeding the film 25. A lens set transmission gear 90 is provided on the upper surface side of the gear housing 13 coaxially with the rotation axis of the sprocket 12, as shown in FIGS. 3 and 12, and these sprocket 12 and lens set transmission are provided. The gear 90 and the gear 90 rotate in synchronization with each other. Further, the one-frame switch 14 is fitted on the upper end portion of the rotation shaft of the lens set transmission gear 90, and the switch housing 14a is covered from above to set screws 14b.
Thus, the switch housing 14a is fixed to the camera body 1 together with the gear housing 13.

Further, as shown in FIG. 12, a main switch 15 of the camera is fixed to a portion of the gear housing 13 located above the cartridge chamber 4 by a set screw 15b together with a switch board 15a. In addition, for switching the main switch 15, the fork portion 16 of the lever member 16 is
a is engaged. On the other hand, a guide hole 13c is formed along the longitudinal direction of the gear housing 13 in a guide wall portion 13b erected at the rear end of the gear housing 13 on the side of the cartridge chamber 4, and the guide hole 13c is provided with a guide hole 13c. The main switch knob 17 is inserted into the guide hole 13c
It is slidable along. Then, the lever member 16 is attached to the protrusion of the main switch knob 17 with the set screw 17a.
The main switch 15 is switched on and off by sliding the main switch knob 17. Further, a through hole is formed in the sliding area of the main switch 17, and a transparent strobe display window 18 is inserted into the through hole.

A side view of the spool chamber 4 of the camera body 1 is shown in FIG.
As shown in FIG. 11, a circuit board 19 that extends to a higher level than the upper surface of the spool chamber 4 and in which a strobe circuit is incorporated is fixed by a set screw 19a, and a transformer 19b incorporated in the circuit board 19 is attached. Large circuit components such as are positioned so as to project above the cartridge chamber 4.
The battery chamber 2 and the spool chamber 3 are located between the battery chamber 2 and the spool chamber 3 and on the front side surface of the camera body 1.
The main capacitor 19c of the strobe circuit is provided by being adhered by the adhesive sheet 19d to the recess formed by the adjacent to each other. And the main capacitor
Neon tube 19e that lights up when charging of 19c is completed,
Behind the transformer 19b, the strobe display window 18
It is arranged on the circuit board 19 so as to be in a position facing the. Therefore, when the neon tube 19e is lit while the main switch knob 17 is operated and the strobe display window 18 is exposed, the neon tube 19e is lit through the strobe display window 18.
Can be confirmed, that is, the completion of charging of the main capacitor 19c can be confirmed. Therefore, the main switch 15 is turned on by the operation of sliding the main switch knob 17 in the direction in which the strobe display window 18 appears. A light emitting portion 20 of a strobe circuit is fixed to the upper front portion of the cartridge chamber 4 by a set screw 20a.

The circuit board 19 fixed to the camera body 1 is connected to a base end of a contact tongue 21a for reading a DX code displayed on the cartridge, and the contact tongue 21a is connected to the circuit board 19. The tip portion of is extended toward the aperture 8 along the side surface of the cartridge chamber 4 and appears on the inner surface of the cartridge chamber 4 at an appropriate position. A pressing plate 21b is put on the contact tongue 21a, and the pressing plate 21b is fixed to the camera body 1 by a set screw 21c. Further, the holding plate 21b
An insulating sheet 21d is fixed to the upper surface of the insulating sheet 21d.
Covers the upper surface of the circuit board 19.

Further, as shown in FIG. 11, a bottom cover 22 is provided on the bottom surface of the camera body 1 for the gear 7a of the initial winding gear train,
It bears bearings such as 7b and covers them, and is fixed to the camera body 1 by a set screw 22a. The upper end of the battery chamber 2 is bent into a substantially U shape, one end of which is located inside the battery chamber 2 so as to come into contact with a terminal of a battery housed in the battery chamber 2 and the other end thereof. Is exposed to the outside of the battery chamber 2 and a connecting tongue piece 23 for connecting the lead wire extended from the circuit board 19 has a set screw 23a.
Is fastened by. Further, at the end of the camera body 1 on the side of the cartridge chamber 4, there is provided a back lid opening / closing knob 24 that can be freely engaged with and disengaged from a back lid, which will be described later. The restoring force of the return spring 24a is urged between the camera and the camera body 1 so that the back cover opening / closing knob 24 always slides to a position where it is engaged with the back cover.

FIG. 13 is an exploded perspective view showing the relation of parts assembled to the fixed lens barrel 30. The fixed lens barrel 30 has a substantially rectangular tubular shape, and a movable lens barrel to be described later can be slid inside the fixed lens barrel 30. To house. The inner surface of the upper wall of the fixed lens barrel 30 is slidable along the direction orthogonal to the optical axis S of the photographing lens, which will be described later, as shown in FIGS.
31 is provided. As shown in FIGS. 1 and 3 to 7, the set lever 31 has a substantially home-base type main portion.
The guide plate portion 31b is extended outward from the apex of the triangular portion of the home base shape, and the guide arm portion 31c is extended outward from the bottom side of the home base shape. Then, a guide hole 31d is formed in the central portion of the guide arm portion 31c along the sliding direction, and the guide pin 32a penetrating the guide hole 31d is further passed through the upper wall of the fixed lens barrel 30,
As shown in FIG. 13, a retaining ring 32b is fitted to a portion of the guide pin 32a protruding from the upper wall to the outside. Further, a part of the upper wall of the fixed lens barrel 30 facing the guide plate portion 31b is formed with a box-shaped guide portion 33 having a bottom plate, which projects to the outside of the fixed lens barrel 30. The guide plate portion 31b is housed in the guide portion 33. Therefore, one end of the set lever 31 is a combination of the guide hole 31d and the guide pin 32a, and the other end thereof is the guide plate portion 3
It is supported by the combination of 1b and the guide portion 33, and its sliding is guided. And
The guide part 33 is covered with a cover 33a to close the upper part.

Further, the main portion 31a of the set lever 31 is formed with a transmission hole 34 having a substantially T-shape, and the transmission hole 34 makes the head portion of the T-shape in a direction along the optical axis S. A set hole portion 34a is formed, and the T-shaped leg portion is formed as a transmission hole portion 34b in a direction along the sliding direction of the set lever 31. A rack portion 34c is formed on the inner side surface of the transmission hole portion 34b. Further, as shown in FIGS. 3 and 13, a part of the upper wall of the fixed lens barrel 30 facing the transmission rear portion 34b is provided with a stepped portion having a small diameter inside the upper wall. The gear hole 30a has is formed.

Further, as shown in FIGS. 1 and 13, on the inner surface of the upper wall of the fixed lens barrel 30, a cam plate 35 is rotatably provided around the shaft portion 35a behind the set lever 31. It is held in a supported state by a set screw 35b. A cam surface 35c is formed from the rear side surface of the cam plate 35 to the surface on the side of the cartridge chamber 4, and a recess is formed on the upper surface. The shaft spring 35a has a biasing spring 36, which is a torsion coil spring, wound around it. One end of the biasing spring 36 is fixed to the upper wall of the fixed lens barrel 30 while being accommodated in the recess. , The other end engages with the edge of the recess. Also, the restoring force of this bias spring 36 is
35 is biased to rotate in the clockwise direction in FIG. 1 about the shaft portion 35a. Since the biasing spring 36 is composed of a torsion coil spring and is housed in the recess formed on the upper surface of the cam plate 35, a space for disposing the biasing spring 36 is not required around the fixed lens barrel 30. , It is preferable for downsizing the camera.

Further, an adjusting screw 37 is screwed on the upper end of the rear end of the fixed lens barrel 30, and the tip end face of the adjusting screw 37 abuts on the side end of the rear face of the cam plate 35. ing. Moreover, the head of the adjusting screw 37 is exposed on the rear surface of the fixed lens barrel 30 so that the adjusting screw 37 can be rotated by inserting a tool such as a screwdriver into the head. Therefore, when the adjusting screw 37 is rotated and moved forward with respect to the fixed lens barrel 30, the cam plate 35 is pushed by the adjusting screw 37 and the shaft portion 35a
Rotate counterclockwise in Fig. 1 around the
When 37 is retracted, the cam plate 35 is rotated clockwise in FIG. 1 by the restoring force of the biasing spring 36. That is, the cam plate is restored by the restoring force of the contact spring 36.
The side end of the rear surface of 35 is pressed against the front end surface of the adjusting screw 37. Further, as shown in FIG. 13, a through hole is formed in the upper wall of the fixed lens barrel 30 to have an appropriate length along an arc centered on the shaft portion 35a, and a fixing screw 38 loosely inserted into the through hole is formed. The cam plate 35 penetrates through the front end of the cam plate 35 and is screwed into the nut 38a on the lower side surface of the cam plate 35. Therefore, the cam plate 35 is fixed in a state where the fixing screw 38 is securely screwed into the nut 38a.

As shown in FIGS. 8 and 13, a fixed lens barrel 30 is provided.
A movable lens barrel, which will be described later, is installed inside the rear portion of the lower wall of the fixed lens barrel 30.
A lens barrel drive motor 39 for moving the lens barrel is provided. The lens barrel drive motor 39 is fixed to a motor support plate 40 by a set screw 39a, and the motor support plate 40 is fixed to the fixed lens barrel 30 by a set screw 40a. A pinion 41 is fitted on the output shaft of the lens barrel drive motor 39, and the rotation of the lens barrel drive motor 39 is rotatably supported from the pinion 41 between the motor support plate 40 and the gear holder 42. Gears 43a, 43b, 43c, 43d and gears 44a, 44b, 44c, 44d, 44e, 4 rotatably supported on the outer surface of the side wall of the fixed lens barrel 30.
Through the lens barrel drive gear train consisting of 4f, it is transmitted to the lens barrel drive gear 45 rotatably supported by the shaft 45a (see FIG. 10) on the side wall of the fixed lens barrel 30.

The lens barrel drive gear 45 is a fan gear as shown in FIGS. 10 and 13, and has contact points 46 for the encoder fixed thereto and a transmission pin protruding inside the fixed lens barrel 30 at an appropriate position. 47 is implanted, and the rotation of the lens barrel drive gear 45 causes the transmission pin 47 to swing about the shaft 45a. Further, an encoder substrate 46 having a contact with which the encoder contact 46 rubs is provided outside the lens barrel drive gear 45.
a is overlaid. The transmission pin 47 is loosely inserted in the side wall of the fixed lens barrel 30, and an arc-shaped through hole is formed so as to allow the rotation of the transmission pin 47 by the rotation of the lens barrel drive gear 45. There is. It should be noted that the gears 44a, 44b, 44c, 44d, 44e, 44f and the lens barrel drive gear 45, the encoder substrate 46a, etc., which compose the lens barrel drive gear train, are covered with a holding plate 48, and the holding plate 48 is stopped. It is fixed to the fixed lens barrel 30 with a screw 48a.

On the inner surface of the side wall of the fixed lens barrel 30 on which the lens barrel driving gear train is supported, as shown in FIGS. 10 and 13, the lens barrel driving lever 50 is provided with a shaft portion 50a at the base end. It is swingably supported around. This lens barrel drive lever 50
An elongated hole portion 50b is formed at the tip portion of the transmission pin 47, and the transmission pin 47 is loosely inserted in the elongated hole portion 50b. Further, on the inner side surface of the lens barrel drive lever 50, a buffer plate 51 having a guide hole portion 51a having a width slightly smaller than that of the long hole portion 50b is set.
Fastened by 1b. Therefore, the transmission pin 4
7 is also loosely inserted in the guide hole 51a of the buffer plate 51. Further, a lens barrel drive pin 52 is planted at the tip of the lens barrel drive lever 50. As shown in FIG. 13, the shaft 50a has a set screw inserted from the outside of the fixed lens barrel 30.
The lens barrel drive lever 50 is supported by the fixed lens barrel 30 by screwing 50c. The swing range of the transmission pin 47 is line-symmetrical across a straight line connecting the shaft 45a of the lens barrel drive gear 45 and the shaft portion 50a of the lens barrel drive lever 50, and with the straight line as the axis of symmetry. Is set.

Further, as shown in FIG. 13, the fixed lens barrel 30 is connected with a lead wire or the like extending from the encoder board 46a to which a printed board 53 is fixed by a set screw 53a.

FIG. 14 is an exploded perspective view of the movable lens barrel 60 housed in the fixed lens barrel 30, which has a substantially rectangular tubular shape.
The shutter unit 61 is fixed to the front part of the shutter unit with a set screw 61a. A front group lens 62 of the taking lenses is held at the front of the shutter unit 61. The front lens group 62 is a lens mount 62 of the front lens group 62.
Along with a, it is housed and held in front of the cam ring 61b of the shutter unit 61, and a cam surface is formed on the surface of this cam ring 61b in the direction of the optical axis S and facing the front of the camera. An annular lens pressing spring 63 is located on the front side of the front lens group 62, and the lens pressing spring 63 is fixed to the shutter unit 61 by a set screw 63a. For this reason, the front lens group 62 has a lens pressing spring on the front surface.
The cam ring 61b is pressed against the cam surface of the cam ring 61b in response to the restoring force of 63, and the front group lens 62 is pushed forward against the restoring force of the lens pressing spring 63 by rotating the cam ring 61b. There is. An appropriate number of protrusions are formed on the rear surface of the lens mount 62a of the front lens group 62 (not shown), and the leading edge of the protrusions is in contact with the cam surface. The position on the optical axis S of the front lens group 62 changes depending on the contact position with the cam surface. A lens set pin 64 protruding rearward is provided at the upper edge of the cam ring 61b, and a return spring 65 is stretched between an appropriate position on the peripheral edge and the shutter unit 61. There is. The restoring force of the return spring 65 urges the cam ring 65 to rotate in a direction to return the cam ring 61b to the original position, that is, the position of the cam ring 61b where the front lens group 62 is located at the rearmost position. There is.

Further, the lens pressing spring 63 is provided with a locking pin 63b which is directed rearward, and the locking pin 63b is provided.
Is a through hole 6 formed in the lens mount 62a of the front lens group 62.
It is inserted in 2b. Therefore, the positional relationship between the lens mount 62a and the lens pressing spring 63 is constant and they are integrally connected. On the other hand, a through hole 63c formed in the lens pressing spring 63 for penetrating the set screw 63a.
Is formed in an arc-shaped long hole. Therefore, when fixing the lens pressing spring 63 to the shutter unit 61, the lens pressing spring 63 can be rotated depending on which position of the through hole 63c the set screw 63a penetrates. The position of the protrusion of the front lens group 62 integral with the cam ring 61b with respect to the cam surface is changed. Therefore, the shutter unit of the lens pressing spring 63
By adjusting the fixed position with respect to 61, the front lens group 62
The initial position on the optical axis S of is determined.

The shutter unit 61 holds shutter blades (not shown), which are opened and closed by a shutter blade drive motor 61c. A flexible printed wiring board 61d is connected to the shutter unit 61 to supply electric power for driving the shutter unit 61 and send a shutter drive signal and the like.

An exchange block 70 is provided on the inner surface of the upper wall of the movable lens barrel 60 so as to be slidable along the direction perpendicular to the optical axis S, as shown in FIGS. There is. The exchange block 70 is formed in a hollow shape, and a guide rod 71 is loosely inserted into the hollow portion from a base end portion thereof, and a return spring 72 formed of a compression coil spring is loosely fitted in the guide rod 71. An engaging portion 70a is formed at the tip of the exchange block 70, and the engaging portion 70a is detachably connected to the lens set pin 64 provided on the cam ring 61b. The restoring force of the return spring 72 is biased to slide the exchange block 70 in the direction in which the engaging portion 70a is disengaged from the lens set pin 64. An exchange pin 73, which is directed upward and protrudes outward from the upper wall of the movable lens barrel 60, is provided at an appropriate position in the middle of the exchange block 70 by being inserted into the collar 73a. The exchange pin 73 is located in the set hole portion 34a of the set lever 31 while being housed in the lens barrel 30. The exchange pin 73 is used for the movable lens barrel 6
Light shield 7 fixed to the outer surface of the upper wall of 0 with a set screw 74a
It penetrates through the four long holes 74b.

On the outer surface of the upper wall of the movable lens barrel 60, as shown in FIGS.
As shown in FIG. 14, the cam lever 75 has a substantially L shape.
Is rotatably supported by the support screw 75a at the L-shaped bent portion. An engaging pin portion 75b protruding upward is formed at the tip of the arm extending rearward of the cam lever 75, and the tip of the arm extending laterally extends. An elongated hole portion 75c is formed in the. And
When the movable lens barrel 60 is housed in the fixed lens barrel 30, the engaging pin portion 75b is in contact with the cam surface 35c of the cam plate 35.

A rear lens group 76 is provided at the rear of the movable lens barrel 60, as shown in FIG. After this, the rear lens group 76 is held by the lens mount 77.
As shown in FIG. 8, the 77 includes support arms at opposite positions.
77a and a guide arm portion 77b are formed. Guide arm 77
A guide protrusion 77c is formed on the tip end surface of b so as to be directed outward. As shown in FIGS. 8 and 9, a guide groove formed parallel to the optical axis S on the inner surface of the movable lens barrel 60. The guide protrusion 77c is loosely inserted in 60a. A guide tube 77d whose longitudinal direction is parallel to the optical axis S is formed at the tip of the support arm 77a, and the rear group guide rod 78 is loosely inserted in the guide tube portion 77d. A lens mount 77 is slidable with respect to the rear group guide rod 78. An input pin 77e protruding upward is provided on the upper surface of the guide cylinder 77d.

Then, as shown in FIG. 14, the front end of the rear group guide rod 78 is supported by a rod bracket 60b provided at the front of the movable lens barrel 60, and the rear group guide rod 78 is supported.
A return spring 79, which is a compression coil spring, and a guide cylinder 77d are loosely fitted in this order from the rear end of the 78, and the lens mount 77 is supported by the rear group guide rod 78. In this state, return spring
Since 79 is pressed by the rod bracket 60b and the end surface of the guide cylinder 77, the restoring force of the return spring 79 causes the lens mount 77, that is, the rear lens group 76 to move rearward.
It will be urged by the lens mount 77. Further, the guide protrusion 77c formed on the guide arm portion 77b of the lens mount 77 is inserted into the guide groove 60a of the movable lens barrel 60. Then, the pressing plate 80 is pressed against the rear end portion of the rear group guide rod 78, and the pressing plate 80 is fixed to the pressing plate bracket 60c (see FIG. 9) provided inside the movable lens barrel 60 with the setscrew 80a. . The input pin 77e protruding from the guide cylinder 77d of the lens mount 77 is loosely inserted in the long hole portion 75c of the cam lever 75.

Further, as shown in FIG. 8, FIG. 9 and FIG.
A side parallel to the optical axis S of the movable lens barrel 60 and near the side where the rear group guide rod 78 is disposed supports the movable lens barrel 60 on the fixed lens barrel 30. A tubular guide bracket 81 for guiding the movement of the movable lens barrel 60 in the direction parallel to the optical axis S is provided. A bush 82 is fitted to the guide bracket 81. Further, a guide portion 60d cut in an arc shape is formed at the rear end of the side diagonally opposite to the side on which the guide bracket 81 is provided.

At the rear end of the guide bracket 81, as shown in FIG. 10, a mirror whose longitudinal direction is along the horizontal direction orthogonal to the optical axis S and perpendicular to the optical axis S is shown. A lens barrel drive hole 81a is formed so that the lens barrel drive pin 52 is loosely inserted into the lens barrel drive hole 81a when the movable lens barrel 60 is accommodated in the fixed lens barrel 30.

Further, as shown in FIGS. 1 and 14, a finder driving cam surface 60e for driving a finder, which will be described later, for variable magnification is formed on the outer surface of the upper wall of the movable lens barrel 60. On the other hand, when the movable lens barrel 60 is housed in the fixed lens barrel 30, a part of the upper wall of the fixed lens barrel 30 facing the finder drive cam surface 60e is shown in FIGS. As shown in, a driving force extraction hole 30b formed of an elongated hole is formed.

Then, as shown in FIG. 14, the movable lens barrel 60 having the shutter unit 61, the front lens group 62, the rear lens group 76, the lens mount 77, etc., is attached to the fixed lens barrel 30.
The main guide rod 83 and the sub guide rod 84 from the front of the fixed lens barrel 30 respectively.
Bushing 82 and guide portion 60 of the guide bracket 81 of 60
The rear end portions of the guide rods 83 and 84 are supported by the rear wall of the fixed lens barrel 30. Further, a front frame body 85 is covered on the front end portion of the fixed lens barrel 30 accommodating the movable lens barrel 60, and the front end portions of the guide rods 83 and 84 are supported on the front frame body 85, and the front frame body 85 is stopped. It is fixed to the front end of the fixed lens barrel 30 with a screw 85a. An elastic light shielding material 86 is interposed between the inner surface of the front frame body 85 and the outer surface of the movable lens barrel 60 to fill the gap between the front frame body 85 and the movable lens barrel 60 and to move the movable mirror. The movement of the body 60 is carried out smoothly while holding it.

As shown in FIGS. 3 and 15, the input gear 91 is inserted into the gear hole 30a of the fixed lens barrel 30 accommodating the movable lens barrel 60 as described above, and the input gear 91 is moved to the set lever. Rack portion 34c formed at the edge of the transmission hole portion 34b of 31
Mesh with. A cylindrical shaft portion 92 and a transmission gear 93 are provided coaxially with the input gear 91. The shaft portion 92 is housed in the stepped portion of the gear hole 30a, and the transmission gear 93 is the upper surface of the fixed lens barrel 30. Has appeared. Therefore, in the gear hole 30a, the inside of the fixed lens barrel 30 is shielded from light by the engagement of the stepped portion and the shaft portion 92. In addition, the input gear 91, the shaft portion 92, the transmission gear
The gear support plate 94 is rotatably supported by the gear support plate 94 in a cantilevered state. As shown in FIG. 15, a lock gear 95 composed of a fan-shaped gear is rotatably supported on the gear support plate 94 by a shaft member 95a, and a cutout end surface of the lock gear 95 is appropriately attached to the gear support plate 94. The position of the lock gear 95 is brought into contact with a stopper 94a formed by bending its position so that the rotation of the lock gear 95 is restricted. The transmission gear 93 meshes with the lock gear 95. Therefore, when the rotation of the lock gear 95 is limited, the rotation of the transmission gear 93 and the input gear 91 is also limited. Then, the gear support plate 94 is attached to the set screw 94.
It is fixed to the outer surface of the upper wall of the fixed lens barrel 30 by b.

On the other hand, as shown in FIG. 3, the lens set transmission gear 90 provided coaxially with the sprocket 12 of the camera body 1 is rotatably supported by the shaft 97a at the base end of the planetary arm 96. The sun gear 97 is meshed with the sun gear 97, and the sun gear 97 is meshed with the planet gear 98 rotatably supported by the shaft 98a at the tip of the planet arm 96. Also, planetary arm 96
The base end portion of the is supported swingably by the camera body 1, and the planetary arm 96, the sun gear 97, and the planetary gear 98 constitute a planetary gear mechanism. Further, a set gear 99 composed of a fan-shaped gear is provided coaxially with the planet gear 98 so as to be disengaged from the planet gear 98 via a one-way clutch mechanism. That is, the set gear 99 is formed on a part of the outer peripheral surface of the cylindrical drum 100, a pair of cutouts 100a are formed at positions facing each other on the inner peripheral surface of the drum 100, and inside the drum 100. A clutch plate 101 is housed. On the outer periphery of the clutch plate 101, there are provided a pair of strip-shaped latching tongues 101a that are biased in the expanding direction, and the tip of the latching tongues 101a engages and disengages with the notch 100a. Is done.
The engagement and disengagement between the latching tongue 101a and the notch 100a is achieved by the rotation direction of the clutch plate 101, and when the clutch plate 101 rotates in the direction in which the leading edge of the latching tongue 101a is oriented, these Engage. The planet gear 98 is held on the inner peripheral surface of the clutch plate 101 so that the clutch plate 101 rotates in synchronization with the planet gear 98. Therefore, the rotation of the planetary gear 98 in one direction causes the engagement tongue piece 101a and the cut portion 100a to be engaged by the rotation,
A one-way clutch mechanism is connected and transmitted to the set gear 99 to rotate it.
The set gear 99 does not rotate because the one-way clutch mechanism is disengaged because the 1a and the notch 100a are not engaged. Further, the speed ratio between the lens set transmission gear 90 and the set gear 99, that is, the planet gear 98 is 1.

Then, as shown in FIG. 15, when the fixed lens barrel 30 accommodating the movable lens barrel 60 is fixed to the camera body 1 with the set screw 30c, the set gear 99 meshes with the transmission gear 93. is there. A pulling spring 102 made of a tension coil spring is stretched between the planetary arm 96 and the fixed lens barrel 30, and the restoring force of the pulling spring 102 causes the set gear 99 to mesh with the transmission gear 93. As described above, the planet arm 96 is urged in the direction in which the planet arm 96 is swung. A stopper pin 96a is provided on the outer surface of the upper wall of the fixed lens barrel 30 as shown in FIGS. 4 to 7, and when the side surface of the planetary arm 96 comes into contact with the stopper pin 96a, The swing of the planet arm 96 due to the restoring force of the pulling spring 102 is limited. In addition, the planet arm 96 is the stopper pin.
96a is in contact with the transmission gear 93.
It is designed to mesh with.

The camera body 1 to which the fixed lens barrel 30 is fixed and the sun gear 97, the planetary gear 98, etc. are attached as described above.
As shown in FIG. 16, a finder unit 110 is put on the sun gear 97 and the planet gears 98, and is fixed to the camera body 1 by a setscrew 110a.

As shown in FIG. 16, the finder unit 110 has a finder casing 111 as a main component, and a finder portion 111a is arranged substantially in the center of the finder casing 111. This finder part
On both sides of 111a, the AF light receiving part 11 for the autofocus device
2 and 113 are provided, and an imaging lens 112 is provided at the front of each of them.
a and 113a are assembled. Further, the AF light receiving unit 112 is provided behind the imaging lenses 112a and 113a, respectively.
b and 113b are fixed.

Further, an AE light receiving portion for an automatic exposure device is provided on the side opposite to the finder portion 111a with the AF light receiving portion 113 interposed therebetween.
114 and self-timer lamp holder 115 are arranged,
A condenser lens 114a is attached to the front of the AE light receiving unit 114. Then, a light receiving element 114b such as a CdS cell and a self-timer lamp 115a including a light emitting diode are fixed to the support plate 116, and the support plate 116 is fixed to the finder casing 111 by a set screw 116a. 114b is located behind the condenser lens 114a, and the self-timer lamp 115a is a self-timer lamp holder 115.
Will be housed in.

As shown in FIGS. 2 and 16, an objective lens 121 is held in the front portion of the finder portion 111a, and an eyepiece lens group 122 is held in the rear portion thereof. A lens mount 123 is supported in the middle portion so as to be slidable in the optical axis direction of the finder. The lens mount 123 holds a variable power lens 124.
The magnification of the finder changes as the lens moves along the optical axis of the finder. Also, the above lens mount 123
The restoring force of the return spring 125 is biased to push the lens mount 123 forward.

The bottom surface of the finder casing 111 is shown in FIG.
As shown in FIG. 6, a variable power lever 126 is rotatably supported by a shaft 126a, and a variable power pin 127 protruding downward is planted at one end of the variable power lever 126. An engaging portion 126b that is connected to the lens mount 123 is formed at the end portion. Then, the engaging portion 126b engages with the lens mount 123 in a state in which the variable power lever 126 is supported by the finder casing 111. Further, as shown in FIGS. 8 and 9, in the state where the finder casing 111 is fixedly attached to the camera body 1, the variable power pin 127 penetrates the driving force extraction hole 30b formed in the fixed lens barrel 30. Moving barrel
The variable magnification pin 127 is positioned so as to face the drive cam surface 60e formed on the outer surface of the upper wall of 60, and receives the force of pushing the lens mount 123 forward by the restoring force of the return spring 125. It is designed to be pressed by the drive cam surface 60e.

Then, as shown in FIG.
A finder cover 128 is covered on the upper part of 1a. A jig through hole 129a is formed at an appropriate position of the finder cover 128, and on the other hand, a jig through hole is formed on the bottom surface of the finder casing 111 opposite to the jig through hole 129a. 129b is formed. Further, with the finder unit 110 fixed to the camera body 1, the cam plate 35 attached to the fixed lens barrel 30 is attached to the portion facing the jig through hole 129b as shown in FIG. The fixing screw 38 has its head positioned. Then, as shown in FIG. 2, when the lens mount 123 is in the retracted position, the lens mount 123 and the variable power lens 124 connect the jig through hole 129a and the jig through hole 129b. The area is saved.

As shown in FIG. 15, a main substrate 130 having a CPU mounted thereon is covered over the finder unit 110 fixed to the camera body 1 and fixed to the camera body 1 by a set screw 130a. It A cutout 130b is formed at an appropriate position on the main board 130, and the finder cover 128 is located in the cutout 130b so that the jig through hole 129a is not hidden by the main board 130. I am doing it. Further, on the upper surface of the main substrate 130, a liquid crystal display unit 131 for displaying the number of film shots, the shooting mode of the camera, etc. is provided. Further, at an appropriate position on the lower surface of the main board 130, a preflash lamp unit 132 having a preflash lamp 132a that emits light prior to the strobe light emission is attached in order to prevent a red-eye phenomenon during flash photography. .

Then, as shown in FIG. 17, the fixed lens barrel is
Attach the front cover 140 to the camera body 1 on which the 30, the finder unit 110, the main board 130, etc.
Fastened by 40a. The front cover 140 has a switch unit 141 in which a release button 141a and zoom switch buttons 141b and 141c are combined in advance, a strobe light emission window 142 integrally formed with a front cover 132b of a preflash lamp 132a, and a viewfinder front cover 111b. And AF ranging window 112c,
Finder frame 143 with 113c and AE light receiving window
A lamp cover 144 having a 114c and a self-timer lamp cover 115b, a protective cover 146 for the main condenser 19c of the strobe circuit, and the like are attached. Also, front cover 1
After 40 is fastened to the camera body 1, the belt fastening portion 145 for fastening one end of the strap belt is fastened to the camera body 1 by the set screw 145a. Further, a front frame 147 having a lens cover 147a is fixed to the front part of the movable lens barrel 60 by a set screw 147b.

On the bottom of the battery chamber 2 of the camera body 1, a battery chamber lid 2a incorporating a connecting plate 148 for connecting the terminals of two batteries is detachably attached. A back lid opening spring 149 for applying a force in the opening direction to the back lid, which will be described later, is fixed to the outer surface of the battery chamber 2 by a set screw 149a.

Then, as shown in FIG. 18, an upper cover is provided on the upper part of the camera body 1 with the front cover 140 covered on the front surface.
150 is put on and the camera body 1 is set by the set screw 150a.
Fastened to. The protective cover 131a of the liquid crystal display unit 131, the photographing mode changeover switch button 151, and the like are previously attached to the upper cover 150. In addition, a jig through hole 129 which is a part of the upper cover 150 and which is formed in the finder cover 128 when the camera body 1 is covered.
A jig through hole 152 is formed at a position facing a, and various adjusting through holes 153 are provided in the vicinity of the jig through hole 152.
A, 153b, 153c and 153d are formed. Then, these jig through holes 152 and adjustment through holes 153a, 153b, 153c, 153d.
A recess 150b is formed in the same shape as the plate 154 on the surface of the upper cover 150 so that a plate 154 on which the model or the like is engraved is covered to cover the above.

The rear end of the camera body 1 has a drawing
As shown at 18, the back cover 160 is supported so as to be openable and closable around the hinge rod 161, and the back surface of the camera body 1 is covered with the back cover 160 closed. A film pressure plate 163 is attached to the inner surface of the back cover 160 via a leaf spring 162, and the film 25 loaded in the camera is pressed by the film pressure plate 163 against the upper and lower portions of the back surface of the aperture 8. The base end of the film guide plate 164 is fixed to the end of the film pressure plate 163 on the spool chamber 3 side.
The leading end of the film guide plate 164 extends to the rear of the spool chamber 3. In addition, the back cover 160 has a date LCD panel 165 for imprinting the shooting date on the film 25 during shooting.
Is attached. An opening 160a in which a transparent plate 160b is incorporated is formed in a portion of the back cover 160 facing the cartridge chamber 4 so that the presence or absence of the film 25 can be visually checked. A packing 166 made of an elastic material such as sponge is adhered to the inner peripheral edge of the opening 160a,
The cartridge loaded in the cartridge chamber 4 is the packing 16
It is pressed by 6 and properly restrained.

The operation of the adjusting structure of the rear group lens guiding cam plate of the camera with a variable focus device constructed as described above will be described together with various operations of the camera.

When the release is completed, the film feeding motor 6 is rotated by a signal transmitted from the CPU mounted on the camera, and the rotation is caused by the rotation of the gears 6b, 6c, 6d,
It is transmitted to the spool rotation gear 5a via a winding gear train composed of 6e, 6f, and 6g, and the spool 5 rotates in the film winding direction. When the rotation of the film feeding motor 6 is transmitted to the sun gear 6f, the planetary arm 6h is swung in the direction in which the planetary gear 6g meshes with the spool rotary gear 5a, and the planetary gear 6g Engage with the spool rotation gear 5a.

When the spool 5 is rotated, the film 25 is wound on the spool 5, and the film 25 is wound.
Travels in the direction of the arrow P in FIG. 3 and in the left direction of FIGS. 4 to 7. Since the sprocket 12 is engaged with the perforation 25a of the film 25, the winding movement of the film 25 causes the sprocket 12 to rotate counterclockwise in FIGS. Further, since the lens set transmission gear 90 is provided coaxially with the sprocket 12, the lens set transmission gear 90 also rotates in the same direction. Further, the 1-frame switch 14 is fixed to the rotation shaft of the lens-set transmission gear 90. The rotation of the lens-set transmission gear 90 is detected by the 1-frame switch 14, and the film 25 is fed by 1 frame. When the lens set transmission gear 90 and the sprocket 12 make one revolution, the one-frame switch 14 sends a signal to that effect to the CPU, and the film feeding motor 6 is stopped. In this state, the film 25 is advanced by one frame.

Since the sun gear 97 is meshed with the lens set transmission gear 90, the sun gear 97 rotates,
Further, the planet gear 98 rotates. Since the planetary gear 98 rotates counterclockwise in FIG. 4, the latching tongue 101a of the clutch plate 101 engages with the notch 100a of the drum 100,
The one-way clutch is engaged, and the rotation of the planet gear 98 is transmitted to the drum 100, that is, the set gear 99. At this time, the sprocket 12 and lens set transmission gear 90
4 rotates counterclockwise in FIG. 4, so the sun gear 97
Rotates clockwise in the figure. The rotation of the sun gear 97 causes the planetary arm 96 to oscillate in the clockwise direction in the figure, so that the planetary gear 98 pivotally supported at the tip of the planetary arm 96 tries to rotate in the same direction. Since the planet arm 96 is biased by the pulling spring 102 so as to rotate in the counterclockwise direction in FIG. 4, the planetary arm 96 is prevented from swinging clockwise due to the rotation of the sun gear 97. For this reason,
The set gear 99, which is coaxial with the planet gear 98, is in a position meshing with the transmission gear 93.

When the set gear 99 rotates and its teeth mesh with the transmission gear 93, the transmission gear 93 rotates clockwise in FIG. 4 and the input gear coaxial with the transmission gear 93. 91 will also rotate in the same direction. At this time,
As shown in FIG. 4, the set lever 31 receives the restoring force of the return spring 72 and is located at the left end of the transmission hole portion 34b.
4 to 7, the restoring force of the return spring 72 is directly applied to the set lever 31 for simplification of the drawings. The set lever 31 is attached to the input gear 91.
Since the rack portion 34c of the set lever 31 is engaged, the set lever 31 is rotated leftward from the position shown in FIG. 4 by the rotation of the input gear 91, that is, the guide plate portion 31b of the set lever 31 is fixed to the fixed lens barrel.
It will slide while projecting to the side of 30. At this time, the sliding of the set lever 31 is such that the guide hole 31d engages with the guide pin 32a supported by the fixed lens barrel 30 and the guide plate portion 31b and the fixed lens barrel 30 project laterally. It is guided by engagement with the guide portion 33 provided.

When the set lever 31 slides to the left from the position shown in FIG. 4, the exchange pin 73 located in the set hole portion 34a of the set lever 31 is moved to the set hole portion 34a.
It is pushed by the edge portion of and moves in the same direction as the set lever 31. Since the exchange pin 73 penetrates the upper wall of the movable lens barrel 60 and is planted in the exchange block 70, the exchange block 70 is also guided by the guide rod 71 and resists the restoring force of the return spring 72. It slides in the same direction as the set lever 31. The sliding direction of this exchange block 70 is shown by the arrow P in FIG.
Direction, and the engagement portion 70a formed at the tip of the exchange block 70 is the cam ring of the shutter unit 61.
Since it engages with the lens set pin 64 of 61b, the cam ring 61 is moved by sliding the exchange block 70 in the arrow P direction.
b will rotate counterclockwise in FIG. 3 about the optical axis S against the restoring force of the return spring 65. That is, the lens set pin 64 turns around the optical axis S from the position shown by the imaginary line in FIG. 9 to the position shown by the solid line.

Since the front lens group 62 is held on the cam ring 61b of the shutter unit 61 while being pressed against the cam surface of the cam ring 61b by the lens pressing spring 63, the front ring lens 62 is rotated by the rotation of the cam ring 61b. Group lens
62 is pushed forward along the optical axis S against the restoring force of the lens pressing spring 63. Then, when the front lens group 62 is pushed to the frontmost position, the cam ring 61b is locked by the locking means (not shown) provided in the shutter unit 61. Therefore, the focus of the taking lens is focused to infinity.

On the other hand, when the set lever 31 slides leftward from the position shown in FIG. 4 to the state shown in FIG. 6 from the position shown in FIG. 5, the guide pin 32a comes into contact with the edge of the guide hole 31d. The set lever 31 can no longer slide to the left. The front lens group 62 set to infinity is
The sliding stroke of the set lever 31 is set so that it is completed before the edge of the guide hole 31d comes into contact with the guide pin 32a. Then, the edge of the guide hole 31d is the guide pin 3
When it comes into contact with 2a, the set lever 31 does not slide, so that the rack portion 34c also does not slide. Therefore, the input gear 91 meshed with the rack portion 34c cannot rotate, and the transmission gear 93 coaxial with this cannot rotate. However, since the film 25 is still being fed at this point, the rotation of the set gear 99 must be continued. That is, since the lens set transmission gear 90 makes one revolution while the film 25 is fed by one frame, the planet gear 98 having a speed ratio of 1 with the lens set transmission gear 90 also makes one revolution. ,
The set gear 99 must also make one revolution. However,
The set gear 99 is supported by the tip of the planetary arm 96, and the set gear 99 receives a reaction force from the transmission gear 93 whose rotation has stopped. Therefore, the planetary arm 96 resists the restoring force of the pulling spring 102 and the upper counterclockwise clock shown in FIG. Swing around. Therefore, the set gear 99 and the transmission gear 93 are disengaged from each other, and the set gear 99 continues to rotate.

Then, the set gear 99 rotates and the transmission gear 93 faces the portion of the set gear 99, which is a fan-shaped gear, on which no teeth are formed, and the transmission gear 93 becomes free. On the other hand, since the restoring force of the return spring 72 is urged to the set lever 31 via the exchange pin 73 and the exchange block 70, the transmission gear 93 becomes free and the input gear that meshes with the rack portion 34c. When 91 is also free, the exchange block 70 and the set lever 31 are moved by the restoring force of the return spring 72, as shown in FIG.
The position shown in FIG. 7 slides to the right from the position shown in FIG. Further, the set gear 99 continues to rotate to the position shown in FIG. 4 by feeding the film 25.

Then, as described above, the one-frame switch 14
When the film 25 is wound up by one frame, the film feeding motor 6 is stopped and the camera stands by for shooting. At this time, as described above, the front lens group 62 is located at the frontmost position and is focused at infinity.

During photographing, the distance to the subject is measured by the autofocus device prior to the release. Then, when the position where the front lens group 62 should be focused on the subject is calculated from this distance measurement data, the front lens group 62 is located at that position.
A cam ring stopper means (not shown) provided in the shutter unit 61 is operated so that the cam ring 61b stops at a position suitable for positioning the 62. The cam ring stopper means has a known structure. For example, an appropriate number of hooks are formed on the outer peripheral surface of the cam ring 61b, and the cam ring 61b is engaged with and disengaged from the hooks around the cam ring 61b. A pawl member for advancing and retracting the turning range of the hook claw by the rotation of the cam claw 61b is arranged so that the rotation stop position of the cam ring 61b is changed depending on which hook the pawl member engages with. To do.

Then, the hooking means for hooking the cam ring 61b with the front lens group 62 in the foremost position is released. Therefore, the front lens group 62 retracts along the optical axis S by the restoring force of the lens pressing spring 63.
Further, the cam ring 61b tries to return to the original position by the restoring force of the return spring 65. But the cam ring
When the rotation of the cam ring 61b is stopped by the cam ring stopper means in the middle of the returning operation of 61b, the backward movement of the front lens group 62 is also stopped, and the photographing lens focuses on the subject at this stop position. Therefore, a photograph in focus is taken at the time of release. When the release is completed, the cam ring stopper means is released, the cam ring 61b returns to its original position by the restoring force of the return spring 65, and the front lens group 62 is pressed by the lens pressing spring 63 until it contacts the cam surface of the cam ring 61b. Then, the film 25 is in a state before winding.

When all the frames of the film 25 have been photographed, the film 25 wound on the spool 5 is rewound. The rewinding of the film 25 is performed by rotating the film feeding motor 6 in a direction opposite to that when the film 25 is wound. When the film feeding motor 6 rotates in the rewinding direction, the sun gear 6f rotates in the opposite direction to that when the film is wound, so that the planetary arm 6h is swung by this rotation and the planetary gear 6g rewinds. Will mesh with the gear 9a. Therefore, the rotation of the film feeding motor 6 is performed by the gears 9a, 9b, 9c, 9d, 9 of the rewinding gear train from the planetary gear 6g.
It is transmitted to the rewinding gear 9g via e and 9f. For this reason,
The fork 4a attached to the shaft portion of the rewinding gear 9g rotates to rotate the shaft of the cartridge in the rewinding direction of the film 25, so that the film 25 is rewound from the spool 5 to the cartridge.

When the film 25 is rewound, the film 25
4 travels rightward in FIG. 4, so the sprocket 12 engaged with the perforation 25a rotates clockwise in the same figure, and the lens set transmission gear 90 also rotates in the same direction. become. Therefore, the planet gear 98 to which the rotation of the lens set transmission gear 90 is transmitted via the sun gear 97 rotates in the clockwise direction in FIG. In this direction of rotation, the one-way clutch is not engaged, so the rotation of the planet gear 98 is not transmitted to the set gear 99. Therefore, the transmission gear 93 and the input gear 91 also do not rotate. Although the planetary arm 96 tries to swing counterclockwise in FIG. 4 depending on the rotation direction of the sun gear 97, it does not swing because it is in contact with the stopper pin 96a.

When the film 25 is loaded in the camera, the leading end (leader part) of the film 25 is placed on the spool 5
The initial winding is done. At the time of this initial winding, the film feeding motor 6 is
The spool 5 is rotated by rotating in the same direction as when winding 25. The rotation of the spool 5 is transmitted from the initial winding gear 5b formed at the lower end of the spool 5 to the one-tooth gear 7c via the gears 7a and 7b to rotate it. This one tooth gear
Since the perforations 25a formed on the leader portion of the film 25 loaded in the 7c are engaged and disengaged, the film 25 is sent to the spool 5 by the rotation of the one-tooth gear 7c at the time of engagement. Moreover, since one perforation 25a is sent per revolution of the one-tooth gear 7c, the film 25
Is fed at a slower speed than when it is wound. And film
When the leading end of the film 25 is securely wound on the spool 5, the spool 5 is subsequently wound to wind it up, and when it is detected by the 1-frame switch 14 that the film 25 is wound up in an appropriate amount, the film is fed. The motor 6 is stopped and the first frame of the film 25 is set on the aperture 8.

Next, the operation for changing the focal length of the taking lens, that is, for zoom driving will be described.

When any one of the zoom switch buttons 141b and 141c protruding above the upper cover 150 of the camera is pressed, the photographing lens is driven to zoom. Now, when the zoom switch button 141b is pressed, the taking lens retracts in the direction of the shortest focal length end (wide end).
1b. ), When the zoom switch button 141c is pressed down, it moves forward in the longest focal length end (tele end) direction (hereinafter referred to as the tele button 141c).

When the movable lens barrel 60 is located at the rearmost part of the fixed lens barrel 30, that is, when the photographing lens is at the wide end, pressing the tele button 141c causes the movable lens barrel 60 to move forward to move the photographing lens. The operation of moving the focal length to the telephoto end is performed. When the tele button 141c is pressed, the lens barrel drive motor 39 rotates, and the gears forming the lens barrel drive motor 39
The rotation of the lens barrel drive motor 39 is transmitted to the lens barrel drive gear 45 via 43a, 43b, 43c, 43d, 44a, 44b, 44c, 44d, 44e, and 44f. On the other hand, when the movable lens barrel 60 is at the rearmost part, the transmission pin 47 implanted in the lens barrel drive gear 45 is
As shown by the phantom line in FIG. 10, it is located on the rear side of the fixed lens barrel 30. When the rotation of the lens barrel driving motor 39 is transmitted to the lens barrel driving gear 45, the lens barrel driving gear 45 rotates clockwise in FIG. 10, and the transmission pin 47 rotates in the same direction. become. Since the transmission pin 47 is loosely inserted into the long hole portion 50b of the lens barrel drive lever 50 through the buffer plate 51, the rotation of the transmission pin 47 causes the lens barrel drive lever 50 to move to the shaft portion 50.
It swings in the counterclockwise direction from the position shown by the imaginary line in Fig. 10 to the position shown by the solid line about a.

The lens barrel drive pin 52 implanted at the tip of the lens barrel drive lever 50 is inserted into the lens barrel drive hole 81a formed at the rear end of the guide bracket 81 of the movable lens barrel 60. Therefore, when the lens barrel drive lever 50 is swung, the moving lens barrel 60 is moved to the main guide rod 83 and the sub guide rod.
It is guided by 84 and advances in parallel with the optical axis S. At this time, in the initial stage of swinging of the transmission pin 47, the transmission pin 47 advances in an obliquely downward direction, so that the movement amount of the movable lens barrel 60 is small even if the swing angle of the transmission pin 47 increases. In the middle period of swinging of the transmission pin 47, the transmission pin 47 is directed in a substantially horizontal direction and advances, so that the moving amount of the movable lens barrel 60 becomes large, and at the end of swinging, the transmission pin 47 is directed diagonally upward. Therefore, the moving amount of the movable lens barrel 60 becomes small. That is, when the movable lens barrel 60 is moved forward, it moves forward at a low speed in the initial and final stages, and moves forward at a high speed in the middle period.

From the contact state between the encoder contact 46 and the encoder substrate 46a, it is detected that the lens barrel drive gear 45 has rotated to an angle sufficient to move the movable lens barrel 60 to the forefront. Then, the lens barrel drive motor 39 is stopped. At this time, the step portion formed on the outer surface of the upper wall of the movable lens barrel 60 contacts the inner surface of the front frame body 85 fixed to the front portion of the fixed lens barrel 30 as shown in FIG. The movable lens barrel 60 is stopped. When the movable lens barrel 60 is stopped, the transmission pin is
Since 47 is in the final stage of swinging and the moving amount of the movable lens barrel 60 is small even if the transmission pin 47 swings at a large angle, it is not necessary to increase the accuracy of the stop position of the lens barrel drive motor 39. . Furthermore, when the movable lens barrel 60 comes into contact with the front frame body 85 and stops,
Even when the lens barrel drive motor 39 is not stopped, the transmission pin 47 contacts the buffer plate 51 fixed to the lens barrel drive lever 50 and bends the buffer plate 51. The power of the barrel drive motor 39 is buffered and is not transmitted to the movable lens barrel 60. Therefore, even if the operation of the lens barrel drive motor 39 is not performed with high precision, the movable lens barrel 60 can be reliably stopped at the tele end of the photographing lens. In addition, the parts will not be damaged due to the collision of the movable lens barrel 60.

The movable lens barrel 60 holds the front lens group 62 and the rear lens group 76, and the front lens group 62 moves as the movable lens barrel 60 moves. In response to the movement of the front lens group 62, the rear lens group 76 must move in cooperation with the front lens group 62 so as to maintain a predetermined optical relationship. That is, when the movable lens barrel 60 moves, the rear lens group 76
The rear lens group 76 is moved by being guided by the rear group guide rod 78 and the guide groove 60a, and is biased to move rearward by the restoring force of the return spring 79. There is. Further, the input pin 77e formed on the lens mount 77 of the rear group lens 76 engages with the cam lever 75, and the engagement pin portion 75b of the cam lever 75 is the cam of the cam plate 35 fixed to the fixed lens barrel 30. It faces the surface 35c. Then, due to the restoring force of the return spring 79, the lens mount 77
Is biased to move rearward, the cam lever 75 rotates counterclockwise about the support screw 75a in FIG. 1, so that the engagement pin 75a is pressed against the cam surface 35c. Therefore, as the cam lever 75 is moved forward by the movable lens barrel 60, the lens mount 77 is moved forward while rotating from the position shown by the solid line in FIG. 1 to the position shown by the imaginary line.
The lens mount 77 advances as the movable lens barrel 60 advances, and also advances according to the cam curve of the cam surface 35c. Therefore, the amount of movement of the front lens group 62 and the amount of movement of the rear lens group 76 are different, and the photographic lens configured by these performs the zoom operation while maintaining a predetermined optical relationship.

Further, in the movable lens barrel 60, the finder drive cam surface 60e formed on the upper surface of the movable lens barrel 60,
The variable power pin 127 connected to the lens mount 123 housed in the finder unit 111a via the variable power lever 126 is pressed. Therefore, when the movable lens barrel 60 moves, the variable power pin 127 moves by being guided by the finder drive cam surface 60e, so that the variable power lever 126 rotates and the lens mount 123 moves along the optical axis of the finder. Will be moved. Since the variable magnification lens 124 is held by the lens mount 123, the magnification of the finder is changed by moving the variable magnification lens 124. When the movable lens barrel 60 moves to the telephoto end side, the variable power lens 124 moves backward, and when the taking lens is located at the telephoto end, the variable power lens 124 moves as shown in FIG. Located at the rearmost part, the viewfinder has a magnification corresponding to the focal length of the taking lens.

When the wide button 141b is pressed while the movable lens barrel 60 is at the forefront, the lens barrel drive motor 39
However, the lens barrel drive gear 45 is rotated counterclockwise in FIG. 10 to rotate the transmission pin 47 from the position indicated by the solid line to the position indicated by the imaginary line. Therefore, the movable lens barrel 60 moves to the wide end side, and moves backward until the rear end portion of the movable lens barrel 60 contacts the rear wall of the fixed lens barrel 30. Even when the movable lens barrel 60 is retracted, as described above, the movable lens barrel 60 is moved at a low speed in the initial and final stages and at a high speed in the middle period by the turning of the transmission pin 47. Further, even if the movable lens barrel 60 stops at the wide end, the rotation of the transmission pin 47 is buffered by the buffer plate 51, so that it is not necessary to increase the accuracy of the operation of the lens barrel drive motor 39.

As described above, when the movable lens barrel 60 moves back and forth, the taking lens needs to maintain a predetermined optical relationship, and this optical relationship controls the amount of forward and backward movement of the rear lens group 76. The state of the cam surface 35c of the cam plate 35 will be followed. Moreover, the lenses are not all the same at the time of manufacturing, and therefore, the position of the front lens group 62 on the optical axis and the rear lens group 76 are adjusted so that the photographing lens moves while maintaining a predetermined optical relationship. It is necessary to adjust the position on the optical axis and the state of the cam surface 35c that controls the movement of the rear lens group 76.

This adjustment is at the final stage of the camera assembling process, and the front frame 147 is not fixed to the movable lens barrel 60, and the upper cover 150 is not covered with the plate 154.
This is done as an initial focus adjustment with the 152 open. First, as described above, the movable lens barrel 60 is retracted to position the taking lens at the wide end. In this state, the fixing position of the lens pressing spring 63 with respect to the shutter unit 61 is adjusted so that the focal point of the taking lens is on the film 25 surface, and the position of the front lens group 62 on the optical axis S is adjusted. That is, when the lens pressing spring 63 is rotated about the optical axis S, the lens mount 62a integral with the lens pressing spring 63 and the locking pin 63b is also rotated, and the lens mount 62a is rotated.
The position of the cam ring 61b relative to the cam surface formed on the cam ring 61b changes. Therefore, the front lens group 62 held by the lens mount 62a moves back and forth in the optical axis S direction to adjust the initial focus at the wide end.

Then, the movable lens barrel 60 is advanced to the telephoto end. When the back cover 160 of the camera is opened, the head of the adjusting screw 37, which is in contact with the end of the cam plate 35, appears on the back surface of the camera body 1. When a predetermined jig such as a screwdriver is inserted into the head of the adjusting screw 37 and rotated, the adjusting screw 37 advances and retreats. When the adjusting screw 37 is moved forward, the end of the cam plate 35 is in contact with the tip of the adjusting screw 37 as shown in FIG. 1, so that the cam plate 35 resists the restoring force of the bias spring 36. Then, the shaft 35a rotates in the counterclockwise direction in FIG. Therefore, the rear group lens 76 connected to the cam surface 35c of the cam plate 35 moves rearward. When the adjusting screw 37 is retracted, the cam plate 35 is rotated clockwise in FIG. 1 by the restoring force of the biasing spring 36, so that the rear lens group 76 is moved forward. Therefore, when the adjusting screw 37 is moved back and forth, the initial focus at the tele end is adjusted.

Then, the adjustment of the initial focus at the wide end and the tele end is appropriately repeated, and when the adjustment is made to be the best, the head of the adjustment pin 37 is fixed with an adhesive or the like. Further, the movable lens barrel 60 is moved forward with the photographing lens moved to the telephoto end. At the position of the movable lens barrel 60, as shown in FIG.
The jig 4 is retracted so that the jig through holes 152 and the jig through holes 129a and 129b are penetrated. Further, the jig through hole 129b faces the fixing screw 38 of the cam plate 35. Therefore, by inserting a predetermined jig through the jig through hole 152 formed in the upper cover 150 and tightening the fixing screw 38, the cam plate 35 can be fixed at the position where the initial focus is adjusted. . And
The front cover 147a and the front frame 147 are fixed to the front part of the movable lens barrel 60, and the plate 154 is covered and adhered to the upper cover 150.

[0084]

As described above, according to the adjusting mechanism for the rear lens group guiding cam plate of the camera with a variable focus device according to the present invention, the adjusting member is pushed by the adjusting member by moving the adjusting member forward and backward. The cam plate biased to the state can be rotated, and the direction of the cam surface can be changed. Therefore, the amount of movement of the rear lens group can be changed simply by moving the adjustment member forward and backward. Therefore, the cam surface can be easily adjusted, and reliable adjustment can be performed.

Moreover, since the urging means only urges the cam plate to rotate in one direction, it has a simple structure and does not increase the cost of the camera.

[Brief description of drawings]

FIG. 1 is a plan view showing a fixed lens barrel and a movable lens barrel, which are suitable for a camera with a variable focus device, having a structure for adjusting a cam plate for guiding a rear lens group, in which a rear lens group is adjusted. The structure is shown.

FIG. 2 is a view for explaining the work of fixing the position of the rear lens group held by the movable lens barrel, and is a side sectional view showing a part of the fixed lens barrel, the movable lens barrel, and the finder. is there.

FIG. 3 is an exploded perspective view showing a main configuration of a taking lens setting mechanism of a camera equipped with a rear group lens guiding cam plate adjusting structure according to the present invention.

FIG. 4 is a schematic plan view for explaining the operation of the setting mechanism of the taking lens of this camera, showing a state before initial setting.

FIG. 5 is a schematic plan view for explaining the operation of the setting mechanism of the taking lens of this camera, showing a state during the initial setting operation.

FIG. 6 is a schematic plan view for explaining the operation of the setting mechanism of the taking lens of this camera, showing a state immediately after the end of the initial setting.

FIG. 7 is a schematic plan view for explaining the operation of the setting mechanism of the taking lens of the camera, showing a state where the initial setting is completed and the set lever is returned.

FIG. 8 is a rear view of the fixed lens barrel and the movable lens barrel, which are partially cut away.

FIG. 9 is a rear view of the fixed lens barrel and the movable lens barrel, in which a part thereof is cut away.

FIG. 10 is a view for explaining a part of a drive mechanism of the movable lens barrel, and is a side view showing a part of the fixed lens barrel and a part of the movable lens barrel which are cut off and which is omitted.

FIG. 11 is a schematic exploded perspective view of a camera body suitable for including the rear group lens guide cam plate adjusting structure.

FIG. 12 is a schematic exploded perspective view of a film feeding motor of a camera suitable for having the rear group lens guiding cam plate adjusting structure, and is a portion to be incorporated in a portion A shown in FIG. .

FIG. 13 is a schematic exploded perspective view of a fixed lens barrel of a camera suitable for including the rear group lens guide cam plate adjusting structure.

FIG. 14 is a schematic exploded perspective view of a movable lens barrel of a camera that is suitable for including the rear group lens guide cam plate adjustment structure.

FIG. 15 is a schematic exploded perspective view showing a state in which a fixed lens barrel, a movable lens barrel, and a main board are incorporated into a camera body of a camera suitable for having a rear group lens guide cam plate adjustment structure.

FIG. 16 is a schematic exploded perspective view of a finder of a camera suitable for including the rear group lens guide cam plate adjusting structure.

FIG. 17 is a schematic exploded perspective view showing a state in which a front cover and the like are incorporated in a camera body of a camera suitable for including the rear group lens guiding cam plate adjusting structure.

FIG. 18 is a schematic exploded perspective view showing a state in which an upper cover and a back cover are incorporated into a camera body of a camera suitable for having the rear group lens guide cam plate adjustment structure.

[Explanation of symbols]

 1 Camera body 3 Spool chamber 4 Patrone chamber 5 Spool 6 Motor for film feeding 6a Pinion 6b, 6c, 6d, 6e Gear 6f Sun gear 6g Planetary gear 6h Planetary arm 8 Aperture 12 Sprocket 14 1 frame switch 15 Main switch 17 Main switch 17 Knob 25 Film 25a Perforation 30 Fixed lens barrel 30a Gear hole 30b Driving force extraction hole 31 Set lever 31a Main part 31b Guide plate part 31c Guide arm part 31d Guide hole 32a Guide pin 33 Guide part 34 Transmission hole 34a Set hole portion 34b Transmission hole Part 34c rack part 35 cam plate 35a shaft part 35b set screw 35c cam surface 36 biasing spring (biasing means) 37 adjusting screw (adjusting member) 38 fixing screw 39 lens barrel drive motor 45 lens barrel drive gear 47 transmission pin 50 lens barrel Drive lever 50a Shaft 50b Long hole 51 Buffer plate 51a Guide hole 52 Lens barrel drive pin 60 Moving lens barrel 60e Finder driving cam surface 61 Shutter Unit 61b Cam ring 61c Shutter blade drive motor 62 Front lens group 63 Lens presser spring 64 Lens set pin 65 Return spring 70 Replacement block 70a Engaging part 71 Guide rod 72 Return spring 73 Replacement pin 74 Light shield 75 Cam lever 75a Support screw 75b Engagement Pin 75c Long hole 76 Rear lens 77 Lens mount 77a Support arm 77d Guide cylinder 77e Input pin 78 Rear group guide rod 79 Return spring 81 Guide bracket 81a Lens barrel drive hole 83 Main guide rod 84 Sub guide rod 85 Front frame Body 90 Lens set Transmission gear 91 Input gear 92 Shaft 93 Transmission gear 94 Gear support plate 94a Stopper 94b Stop screw 96 Planetary arm 96a Stopper pin 97 Sun gear 97a Axis 98 Planetary gear 98a Axis 99 Set gear 100 Drum 100a Notch 101 Clutch plate 101a Latching tongue 102 Pulling spring 110 Finder unit 111 Finder casing 111a File 121 Objective lens 122 Eyepiece group 123 Lens mount 124 Variable magnification lens 125 Return spring 126 Variable magnification lever 126a Axis 126b Engagement section 127 Variable magnification pin 128 Finder cover 129a Through hole for jig 129b Through hole for jig 130 Main Board 140 Front cover 141 Switch unit 142 Flash emission window 150 Top cover 152 Through hole for jig 154 Plate 160 Back cover

Claims (1)

[Claims] 1. The rear lens group and the front lens group are predetermined by sliding the front lens group and the rear lens group held by the movable lens barrel with respect to the fixed lens barrel. In the camera with a variable focus device, which has a variable focus device for moving the optical axis in the optical axis direction to change the focal length while maintaining the optical relationship thereof, and which guides the optical axis direction of the rear lens group by a cam mechanism. The cam plate of the mechanism is rotatably supported on the immovable part of the camera about a direction substantially parallel to the cam surface, and the cam plate moves in the direction of rotation of the one end within the rotation range of the one end. An adjustable member that is movable back and forth is provided in the immovable portion of the camera, and a biasing force is applied to the cam plate so that the one end of the cam plate rotates in a direction in which it is always pressed by the surface of the adjustment member in the forward and backward direction. Rear group of cameras with variable focus device characterized by providing means Adjustment structure for cam plate for lens guide.