JPH0622831Y2 - Parallax switching finder - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is attached to a focal length switchable camera capable of shooting at two different focal lengths and also capable of close-up shooting (macro shooting). The present invention relates to a finder that provides a field of view corresponding to a distance.

[Conventional technology]

In the lens shutter type compact camera, for example, there is known a focal length switching type camera that can be used by switching between wide shooting (wide angle shooting) with a focal length of about 35 mm and tele shooting (telephoto shooting) with a focal length of about 70 mm. Is. For such a camera, a variable magnification finder is used in which the magnification of the field of view is switched according to the switching of the focal length of the taking lens. In such a variable magnification finder, for example, a finder objective lens is configured by two concave lenses during wide-angle shooting, the front concave lens is retracted during tele shooting, and the rear concave lens is retracted from the optical path to change the magnification. There is something to do.

The viewfinder of the compact camera is provided above the taking lens, and the optical axis of the viewfinder is set to be parallel to the optical axis of the taking lens. Therefore, the finder parallax (parallax) influences as the subject distance approaches, and when the subject distance approaches 1 m, the shift between the center of the photographic screen and the center of the viewfinder considerably increases. In particular, in a compact camera that enables close-up photography, it is essential to correct the parallax that occurs in this way. Up until now, the optical axis of the viewfinder was deflected by inserting and removing a transparent wedge plate in front of the viewfinder objective lens. I'm trying to do.

[Problems to be solved by the invention]

However, a close-up shooting function was added to the focal length switching type camera using the variable magnification finder as described above, and the wedge plate as described above was inserted in front of the viewfinder objective lens for parallax correction during this close-up shooting. When I try to take it off,
The configuration of the finder optical system tends to be very complicated. That is, the finder objective lens is moved for zooming,
Alternatively, in addition to a mechanism for moving a part of it in and out of the optical path, a mechanism for inserting and removing a wedge plate for parallax correction is also required, and the interlocking mechanism is complicated to interlock these with the focal length switching of the taking lens. It will become something.

[Purpose of device]

The present invention has been made in view of such a technical background, and provides a parallax switching viewfinder that ensures a good field of view not only in normal shooting but also in close-up shooting without increasing complexity and size. The purpose is to provide.

[Means for solving problems]

In order to achieve the above object, the parallax switching viewfinder of the present invention is inserted into the viewfinder optical axis with the eyepiece lens fixed to the camera body and shifted in the direction away from the shooting optical axis during short focus shooting. , The first lens retracted from the optical axis of the viewfinder during long-focus shooting,
It moves to the short focus position away from the eyepiece during short focus shooting, moves to the long focus position close to the eyepiece during long focus shooting, and further maintains the long focus position in the optical axis direction during close-up shooting while maintaining the shooting light. And a second lens that shifts in a direction away from the axis.

[Action]

According to the above means, at the short focal length, the second lens moves forward in the optical axis direction, and at the same time, the first lens is inserted into the optical axis to provide a wide-angle finder magnification, and at the long focal length, the first lens. Is retracted, and the second lens moves rearward in the optical axis direction to provide a finder magnification for telephoto. Furthermore, the second lens shifts upward during close-up photography,
Parallax correction for close-up photography is performed.

An embodiment of the present invention will be described below with reference to the drawings.

〔Example〕

In FIG. 1 showing an outline of a moving mechanism of a parallax switching type finder 80, a movable barrel 3 and a movable unit 5 of the present invention, a fixed barrel 2 is fixed to a front surface of a body 1, and a movable barrel 3 is provided inside thereof. Is movably supported in the optical axis direction, and is extended to the position shown in the figure during long-focus shooting, and retracted from the position shown in short-focus shooting. Furthermore, the moving barrel 3
A movable unit 5 including a lens barrel 6 holding a master lens 4 is supported by the movable unit 5 and the movable unit 5 is moved inside the movable barrel 3 in the optical axis direction when the focal length is switched. A long hole 3a is formed at the rear end of the movable barrel 3, and a pin 36 planted at the free end of the feeding lever 35 is engaged with the long hole 3a. The feeding lever 35 is made of, for example, a thin metal plate having a spring property,
It is rotatably attached to the body 1 via a shaft 37. A long hole 40 is formed in the central portion of the feeding lever 35 so as to be surrounded by a substantially U-shaped slot 39. A pin 41 is engaged with the long hole 40 of the feeding lever 35. This pin 41 is a rotary plate 4 that is integral with the shaft 42.
3 is projected. Then, the rotating plate 43 is rotated together with the shaft 42 through a gear train by driving the motor 45.

A macro lever 46 is rotatably attached to the shaft 42 as a support shaft. The macro lever 46 has a protrusion 46
When a is provided and the rotary plate 43 rotates counterclockwise by a certain amount, the macro lever 46 is rotated by being pushed by the engaging piece 43a of the rotary plate 43. The pin 47 planted in the macro lever 46 is inserted into the L-shaped slot 48 a of the link lever 48. The link lever 48 is rotatable about a shaft 49 that is planted in the moving barrel 3. A torsion spring 50 is interposed between the pin 47 and the link lever 48, and the rotation of the macro lever 46 is transmitted to the link lever 48 via the torsion spring 50. That is, when the macro lever 46 rotates counterclockwise, the pin 47 pushes one end of the torsion spring 50 downward to bend it. The bending of the torsion spring 50 reaches the other end, and the biasing force at this time causes the link lever 48 to rotate clockwise around the shaft 49.

The link lever 48 is integrally formed with a pressing piece 51. When the link lever 48 rotates clockwise, the pressing piece 51 is planted at the rear end of the movable unit 5 and presses the pin 52 penetrating the partition wall of the movable barrel 3.

The rotation of the gear 55 fixed to the shaft 42 is transmitted to the gear 57 to which the cam plate 56 is fixed. When the cam plate 56 rotates, the cam lever 58 provided so as to trace the cam surface rotates. The rotation of the cam lever 58 is transmitted to the slide plate 61 via the switching lever 60.
That is, when the switching lever 60 rotates,
The slide plate 61 is moved in the left-right direction via the pin 60a and the long hole 61a. The slide plate 61 includes a spring 6
The urging force to the left is given by 2.

The slide plate 61 is further provided with slots 61b and protrusions 61c each having a bent portion. The slot 6
A pin 64a planted on the lever 64 is engaged with 1b. The lever 64 is rotatable about a shaft 65 fixed to the body 1, and further the pins 64b and 64c.
Has been planted. The pin 64b engages with a long hole 67b of a lever 67 holding a G1 lens (first lens) 66 used in the optical system of the finder 80, and the pin 64c also has a G2 lens (first lens) for configuring the optical system. The second lens 68 is engaged with the slot 69a of the lever 69. The optical system of the finder 80 is G1,
In addition to the G2 lenses 66 and 68, a G3 lens 70 fixed to the body 1 and a G4 lens 71 serving as an eyepiece lens
And a reticle 72. A half coat is applied to the front surface of the G3 lens 70, and the field frame image of the reticle 72 reflected by the half coat is the G4 lens 7.
Can be observed through 1.

When the lever 64 rotates in conjunction with the movement of the slide plate 61, the lever 67 rotates about the shaft 67a via the pin 64b. Reference numeral 73 indicates a spring that biases the lever 67 in the clockwise direction. The other pin 64c planted in the lever 64 moves the lever 69 in the finder optical axis F direction along a guide (not shown) provided in the body 1 through the elongated hole 69a. Then, when the slide plate 61 slides to the left from the illustrated position, the lever 64 rotates clockwise. As a result, the lever 67 also rotates clockwise from the illustrated state to G
1 lens 66 is inserted into the finder optical axis F, and further the lever 69 moves forward along the finder optical axis F,
The G2 lens 68 moves from the long focus position near the G4 lens 71 to the short focus position away from the G4 lens.

Further, the G1 lens 66 has a lever 67 in a state in which the lens optical axis of the G1 lens 66 is displaced above a horizontal plane including the finder optical axis F.
Therefore, when the lever 67 is rotated clockwise from the illustrated position, the G1 lens 66 is inserted into the finder optical axis F while being shifted in the direction away from the photographing optical axis P.

The G2 lens 68 is movable along the finder optical axis F as described above, and can also be shifted upward from the illustrated position. That is, the G2 lens 68 is the lens frame 6 integrated with the lever 69.
9 is held so that it can be slid up.
In the illustrated state, the G2 lens 68 is moved by the leaf spring 74 attached to the upper end of the lens frame 69a.
Is pressed to the lower position, but when the slide plate 61 moves to the right, the protrusion 61c causes the G2 lens 68 to move.
Since the rod 68a integrated with is pushed up, the G2 lens 68 is lifted up against the leaf spring 74 and is shifted in the direction away from the photographing optical axis P.

The operation of the finder 80 configured as described above will be described including the operation of the moving mechanism of the movable barrel 3 and the movable unit 5. First, the optical system of the viewfinder 80 in the tele mode state shown in FIG. 1 has a G2 lens 68, a G3 lens 70, and a G4 lens as shown in FIGS. 1 and 2B.
It is composed of a lens 71 and a lens 71 so that a finder magnification suitable for the tele mode can be obtained.

When the shooting mode is switched from the tele mode to the macro mode, the motor 45 is driven from the state shown in FIG. 1 and the gear 55 rotates counterclockwise. As a result, the rotating plate 43
The macro lever 46 is rotated counterclockwise through the protrusion 43a. Then, the pin 47 at the tip of the macro lever 46 comes to push down the torsion spring 50, and the bias of the torsion spring 50 causes the link lever 48 to move.
Rotates counterclockwise.

By the way, in order to rotate the link lever 48 as described above, the rotary plate 43 is rotated, but in the tele mode, the movable barrel 3 is at the most extended position, and the movable barrel 3 is fixed. It is in a state where it cannot move due to contact with the cylinder 2, and even if the rotary plate 43 rotates, the feeding lever 3
5 is not rotated counterclockwise. When the rotary plate 43 rotates in this state, the pin 41 moves the feed lever 3
5 along the long hole 40. However, since the shape of the elongated hole 40 is different from the locus of movement of the pin 41, the peripheral portion of the elongated hole 40 is narrowed by the movement of the pin 41 on one side of the U-shaped slot 39. It will be transformed. That is, from the state shown in FIG.
When is moved counterclockwise, the periphery of the elongated hole 40 is deformed so that the width of the front side of the slot 39 is narrowed. As a result, an urging force is generated in the feeding lever 35 in the direction of pushing the moving barrel 3 forward, and the moving barrel 3 is elastically held in the same position.

As described above, when the movable barrel 3 is held at the same position and the link lever 48 rotates counterclockwise, the pressing piece 51 formed at the other end of the link lever 48 moves to the rear end of the movable unit 5. The movable unit 5 is pushed forward through the pin 52. In this way, the gear 57 rotates counterclockwise in parallel with the shift of the taking lens from the tele mode to the macro mode, and the slide plate 61 moves to the right via the cam lever 58 and the switching lever 60.

When the slide plate 61 moves to the right, the protrusion 61c enters under the rod 68a and shifts the G2 lens 68 upward by x as shown in FIG. 2 (C). As a result, the viewfinder optical axis F is corrected downward so as to be suitable for close-up photography, and the viewfinder parallax can be eliminated.

As described above, the movable unit 5 is extended, the G2 lens 68 of the finder 80 is shifted upward, and the motor 4 is moved.
The driving of No. 5 is stopped and the setting to the macro mode is completed.

When a mode button (not shown) for switching the focal length of the taking lens is pressed in the tele mode, the motor 45 is driven and the gear 55 rotates clockwise. When the gear 55 is rotated in the clockwise direction, the rotary plate 43 also rotates in the same direction, and as a result, the movable barrel 3 moves backward via the feeding lever 35.

When the movable barrel 3 moves backward in the fixed barrel 2, the lens barrel 20 holding a conversion lens (not shown) retracts from the photographing optical axis P, and a wide-mode photographing optical system is formed. The rearward movement of the movable barrel 3 is stopped when the rear edge of the movable barrel 3 contacts the rear edge of the fixed barrel 2. After the retreat of the movable barrel 3 is stopped in this way, the motor 45 is slightly rotated and stopped.
Due to this excessive rotation of the motor 45, the pin 41 of the rotary plate 43 deforms the peripheral portion of the elongated hole 40 of the feeding lever 35 so as to narrow the rear side of the lot 39. In this way, the repulsive urging force generated in the feeding lever 35 urges the movable barrel 3 in the backward direction, and thus the movable barrel 3 is elastically held in the wide mode position.

In this way, the slide plate 61 moves leftward from the position shown in FIG. 1 in association with the movement of the movable barrel 3 to the wide mode position. As a result, the slot 61b and the pin 6
The lever 64 is rotated clockwise by the engagement with 4a. Then, the lever 69 holding the G2 lens 68
While moving forward along the finder optical axis F, the lever 67 holding the G1 lens 66 rotates clockwise to move to G1.
The lens 66 is inserted into the optical axis F of the finder to form the optical system shown in FIG. This G1 lens 6
6, the optical axis is previously shifted upward by y,
The viewfinder optical axis F is adjusted by parallax so as to be suitable for wide shooting, and the viewfinder magnification is also adjusted to be suitable for wide shooting.

When the mode button is pressed to switch from the wide mode state to the tele mode state, the motor 45 is driven and the rotating plate 43 is rotated counterclockwise via the gear 55, so that the movable barrel 3 is extended. Is fed forward by. At the end of this feeding, the contact surface 3b of the movable cylinder 3 is pressed against the receiving surface of the fixed cylinder 2 before the motor 45 is stopped. Therefore, the motor 45
The pin 41 deforms the peripheral portion of the elongated hole 40 of the feeding lever 35 by the excessive rotation of the feeding lever 35,
The moving cylinder 3 is held at the telemode position by the repulsive urging force. Also, in conjunction with this operation, the finder 8
The optical system of 0 is switched from the state shown in FIG. 2 (A) to the telemode state shown in FIG. 2 (B).

[Effect of device]

As described above, the first lens is inserted in the finder optical axis while being shifted or retracted in conjunction with the switching of the focal length, and the second lens is moved back and forth on the finder optical axis to further approach the finder optical axis. This second when shooting
The lens is configured to shift to correct parallax. Therefore, a simple and compact structure is achieved without inserting a member such as a wedge-shaped glass in addition to the optical system required for the original magnification change, and the normal focal length and the focal length at the time of close-up photography can be used for each. A magnification corresponding to the focal length and a good visual field with parallax correction are guaranteed.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of essential parts showing an embodiment of the present invention. FIG. 2 is an explanatory view schematically showing switching of the finder optical system. 61 ... slide plate 61c ... projection 66 ... G1 lens 68 ... G2 lens 70 ... G3 lens 71 ... G4 lens 72 ... reticle 80 ... finder.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Masao Tokaibayashi Masao Tokaibayashi 1-324, Uetake-cho, Omiya City, Saitama Prefecture Fuji Photo Koki Co., Ltd. (56) References JP-A-52-137331 (JP, A) 54-66541 (JP, U) Actually opened 60-63829 (JP, U) Actually opened 60-63834 (JP, U)

Claims (2)

[Scope of utility model registration request] 1. In a viewfinder of a camera capable of performing close-up shooting in addition to short-focus shooting and long-focus shooting, the eyepiece fixed to the camera body and the focus switching of the shooting lens are interlocked, and shooting is performed at the time of short-focus shooting. The first lens is inserted in the optical axis of the finder in a state of shifting away from the optical axis and is retracted from the optical axis of the finder during long-focus shooting, and it moves on the optical axis of the finder in conjunction with focus switching of the shooting lens. , In short focus shooting, it is moved to a short focus position away from the eyepiece lens, and in long focus shooting, it is moved to a long focus position close to the eyepiece lens, and in close-up shooting, in the direction away from the shooting optical axis at the long focus position. A parallax switching finder characterized by having a second lens that is shifted. 2. The utility model registration claim 1, wherein the insertion and removal of the first lens and the movement and shift of the second lens are performed by driving a motor for switching the focal length. Parallax switching finder.