JPH0684441U - Camera viewfinder - Google Patents

Abstract

(57) [Abstract] [Purpose] To reduce the number of parts, simplify the configuration, and realize further downsizing of the finder device. [Structure] A pair of light-shielding plates, which are provided so as to be able to move forward and backward on opposite sides of a substantially rectangular finder field and move to a retracted position and an advanced position to change the size of the finder field, and a pair of light-shielding plates. The operation member that moves the plate to the advance position within the viewfinder field or the retract position from the viewfinder field, and the pair of light blocking plates are urged in the direction toward the advance position within the viewfinder field or the retract position from the viewfinder field. Finder device for a camera, wherein the urging member is integrally formed with the operating member.

Description

[Detailed description of the device]

[0001]

【Technical field】

 The present invention relates to a finder device of a camera capable of switching a viewfinder field size.

[0002]

[Prior art and its problems]

 So-called panoramic photography is a photography and printing technique that obtains a horizontally long printing photograph without using a fixed width above and below the film frame. In order not to use this fixed width above and below for drawing, the fixed width above and below the film is normally shielded. For cameras equipped with such a panorama shooting function, for example, in conjunction with switching to the panorama shooting mode, a pair of screen restriction plates are extended from the top and bottom of the shooting opening to block the fixed width of the shooting screen. What is known is.

In such a camera, in order to give the photographer a sense of the range that can be photographed by a photographing screen that shields a certain width in the vertical direction, the vertical direction within the viewfinder field is linked with the change in the vertical width of the photographing screen. A pair of shading plates have been advanced from.

By the way, in a camera, particularly a compact camera, since the space constituting the viewfinder and its surroundings is small, a mechanism for moving a used component, for example, a pair of light-shielding plates back and forth within the field of view of the viewfinder, has a small number of components. It is desirable to reduce the number of components and make it as small as possible.

[0005]

[The purpose of the device]

 The present invention has been made on the basis of such an awareness of problems, and provides a viewfinder device for a camera, which can reduce the number of parts, simplify the configuration, and realize further downsizing. It is an object.

[0006]

[Outline of the Invention] The present invention, which achieves the above-mentioned object, is provided so as to be able to move forward and backward on opposite sides of a substantially rectangular viewfinder field, and moves to a retracted position and an advanced position to reduce the size of the viewfinder field. The pair of shading plates to be changed, the operation member for moving the pair of shading plates to the advance position in the viewfinder field or the retracted position from the viewfinder field, and the pair of light shields to the advance position in the viewfinder field or The urging member is configured to urge in a direction toward the retracted position from the viewfinder field, and the urging member is integrally formed with the operating member.

[0007]

【Example】

 The present invention will be described below with reference to illustrated embodiments. FIG. 11 is a perspective view of the camera 10 to which the present invention is applied, viewed from the back side. This camera 10 is a so-called lens shutter type camera, which is provided with a zoom photographing optical system and a zoom finder optical system, and is provided with a film winding chamber 8 and a film chamber 7 on the left and right of a camera body 9, and the film chamber 7 and The film winding chamber 8 is provided with a photographing opening 11 sandwiched between the upper and lower opening frame portions 5. A back cover 14 having a film pressing plate 42 is provided on one side of a rear wall 16 of the camera body 9 so as to be openable and closable, and a finder eyepiece window 17 is provided at the center of the upper portion of the rear wall 16.

The real-image type zoom finder device 12 mounted on the camera 10 has the zoom finder optical system configured separately from the zoom photographing optical system, and as shown in FIG. It has a plate 15. Note that FIG. 8 is a plan sectional view showing a state in the shooting lens storage transition section.

The frame body 13 is formed in a substantially L shape in a plan view, and in order from the object side, the first lens group L1, the second lens group L2, the third lens group L3, the fourth lens group L4, and the prism 57 ( 3) and the fifth lens unit L5 (FIG. 11). The third, fourth and fifth lens groups L3, L4 and L5 are all fixed lens groups, the third and fifth lens groups L3 and L5 have positive power, and the fourth lens group L4 is Has negative power. The first and second lens groups L1 and L2 are movable variable power lens groups, and have negative power and positive power, respectively. The optical path including the first and second lens groups L1 and L2 and the optical path including the third and fourth lens groups L3 and L4 are formed by bending each other by approximately 90 °, and there is a predetermined angle between the optical paths. By the reflector 33 provided, the light flux that has passed through the first and second lens groups L1 and L2 is bent so as to enter the third, fourth, and fifth lens groups L3, L4, and L5.

The first lens unit L 1 is supported by a first lens moving frame 34 fixed to the guide ring 27, and is movable in the front-back direction of the optical axis O. The guide ring 27 is guided by a guide bar 26 extending in the front-rear direction on one side of the front portion of the frame body 13. The first lens unit L1 is constantly urged forward of the optical axis by a tension spring 23 hooked between the guide ring 27 and the front portion 13c of the frame body 13. The first lens moving frame 34 has a cam pin 86 that is projected below the frame body 13 and is guided to be moved by the cam plate 15.

The second lens unit L2 is supported by a second lens moving frame 32 fixed to the guide ring 31, and is movable in the front-rear direction of the optical axis. The guide ring 31 is moved and guided by a guide bar 30 extending in the front-rear direction of the frame body 13. The second lens moving frame 32 has a cam pin 85 that is projected below the frame body 13 and is guided to be moved by the cam plate 15. Further, behind the guide bar 26, a prism frame 36 rotatably supported by a rotation support shaft 35 supported on the frame body 13 side is provided. The prism frame 36 supports a correction prism (not shown) for parallax correction, and the correction prism 40 has a correction position for entering the optical path of the zoom finder optical system and an evacuation position for retracting from the optical path. Move to.

As shown in FIG. 9, the cam plate 15 has a pinion 82, which is provided on the camera body 9 and rotates in conjunction with a zoom photographing optical system, on one side facing the eyepiece side (upper side in the figure). It has a rack 20 that meshes. The cam plate 15 has a movement guide groove 24 formed in parallel with the rack 20, and movement guide pins 83 and 84 fixed to the bottom portion of the frame 13 at predetermined intervals are fitted in the movement guide groove 24. ing. Therefore, the cam plate 15 is guided by the fitting relationship between the movement guide pins 83 and 84 and the movement guide groove 24 so as to be movable in the left and right directions of the camera 10 within the effective length range of the movement guide groove 24. It The cam plate 15 has a cam groove 21 into which the cam pin 85 embedded in the second lens moving frame 32 is fitted, and a cam opening 22.

A first lens moving frame 34 (first lens group L1) and a second lens moving frame 32 (second lens group L2) are moved or held in the respective positions in the cam opening 22 and the cam groove 21. A shooting lens storage transition section d3, a zoom section d1, and a macro transition section d2 are provided for this purpose.

As shown in FIG. 3, behind the fourth lens unit L4, a pair of light-shielding plates 63 for changing the size of the field frame 45 are arranged orthogonal to the optical path of the finder optical system, that is, on the paper surface of FIG. It is rotatably provided so as to be perpendicular to. As shown in FIG. 4, each of the pair of light shielding plates 63 includes a field-of-view restricting portion 63a formed in the central portion, rotating shaft portions 63b and 63c formed on both sides of the controlling portion 63a, and a crank from the rotating shaft portion 63b. It integrally has a rotation transmitting portion 63d that is bent into a shape.

FIG. 6 shows a state in which the view frame 45 (FIG. 3) of the finder optical system of the switching interlocking mechanism of the photographing screen and the view frame size is not switched to the panorama size. In the figure, the pair of light shielding plates 63 have their rotation transmission parts 63d projected to the finder eyepiece window 17 side, that is, the rear of the camera 10, and their rotation shaft parts 63b and 63c are rotated to the frame body 13. It is movably supported.

The camera body 9 is provided with a linear drive lever (operation member) 65 for transmitting the linear motion to the pair of light shielding plates 63 as a rotary motion so as to be linearly movable in the left-right direction of the photographing opening 11. There is. The linear drive lever 65 is made of a flexible metal material or the like. As shown in FIG. 6, a pair of engagement grooves 65c for engaging the rotation transmitting portion 63d are provided at one end and the other end of the linear drive lever 65, respectively, and engagements that are opened downward in FIG. The long hole 65e is formed. As shown in FIG. 5, at the top and bottom of the central portion of the linear drive lever 65, spring portions 65d formed by press working or the like are formed in line symmetry. The reference numeral 65a in the figure is a notch.

The spring portion (biasing means) 65d is bent to the back surface side of the lever 65 by pressing or the like as described above, and the vicinity of its tip end is engaged with the pair of engagement grooves 65c. By being inserted between the pair of rotation transmitting portions 63d that are joined together, the pair of rotation transmitting portions 63d are constantly urged in a direction in which they extend. Since the spring portions 65d are elastically contacted with the pair of rotation transmitting portions 63d, respectively, the pair of light shielding plates 63 should be considered when the straight drive levers 65 rotate about the rotating shaft portions 63b and 63c. When it goes over, it instantly turns in the same direction and stabilizes at the turning end. Therefore, the spring portion 65d and the pair of light shielding plates 63 form a snap action mechanism.

That is, in the state of FIG. 6 in which the pair of engagement grooves 65c are engaged with the rotation transmission portions 63d of the pair of light shielding plates 63, when the linear drive lever 65 is linearly moved to the right in the figure, a pair of The light-shielding plate 63 is instantaneously rotated about the rotary shafts 63b and 63c so that the field-of-view restricting portion 63a is advanced into the optical path of the finder optical system, and a panorama that shields a certain width above and below the viewing frame 45. Can be size. Then, the rectilinear drive lever 65 that moves the pair of light shielding plates 63 to the advance position into the viewfinder field or the retract position from the viewfinder field is moved to the advance position into the viewfinder field or the retract position from the viewfinder field. Since the spring portion 65d for urging the pair of light-shielding plates 63 is integrally formed, the number of parts can be reduced as compared with the case where the linear drive lever 65 and the urging member are formed by separate members. The configuration can be simplified.

Inside the opening frame portion 5 of the camera body 9 in FIG. 11, a screen size switching mechanism 69 shown in FIG. 1 is provided in correspondence with the photographing opening 11. The screen size switching mechanism 69 shown in the figure is shown as viewed from the taking lens side of the camera 10, that is, from the front side of the camera 10. The screen size switching mechanism 69 has a pair of light-shielding plates 70 and 71 that shields a fixed width above and below the shooting screen to change its size. The light-shielding plate 70 has a screen restricting portion 70d at the center, and is provided with two guide parts 70a on the left and right of the screen restricting portion 70d for guiding the screen restricting portion 70d toward the photographing opening 11. It is formed in a U shape. Each of the guide portions 70a is supported by a not-shown step so as to be movable in the vertical direction. The light blocking plate 70 also has an engaging arm portion 70c extending upward from the central portion of the screen restricting portion 70d. The engagement arm portion 70c has an engagement elongated hole 70e which is opened toward one side.

The light blocking plate 71 is interlocked with the light blocking plate 70 by an interlocking mechanism so as to move forward and backward with respect to the photographing opening 11 while being sandwiched between the left and right guide portions 70 a. This connecting mechanism has two connecting bars 73 and 74 which are rotatably connected to each other by pivot pins 72 fixed to the camera body 9 and intersecting each other. The connecting bars 73 and 74 respectively engage the long holes 73a and 74a at one end with the support pins 70b planted at the lower ends of both guides 70a, and shield the long holes 73a and 74a at the other end. The plate 71 is engaged with the support pins 71b which are planted at predetermined intervals.

The camera body 9 is provided with a rotation drive member 67 rotatably by a rotation support shaft 66, which is located between the engagement arm portion 70 c of the light shielding plate 70 and the linear drive lever 65. The rotation support shaft 66 extends rearward of the camera body 9 and projects rearward from the camera body 9, and an operation knob 110 for manually rotating the rotation drive member 67 in the forward and reverse directions at the rear end thereof. Is attached. The rotation drive member 67 has an engagement protrusion 67a located on the circumference thereof and an engagement protrusion 67c protruding outward in the radial direction. The rotation drive member 67 engages the engagement protrusion 67c with the engagement elongated hole 70e of the engagement arm portion 70c, and engages the engagement protrusion 67a with the engagement elongated hole 65e of the linear drive lever 65. , And transmits the rotational movement to the pair of light-shielding plates 70 and 71 and the linear drive lever 65 as linear movement.

As shown in FIG. 2, in the present zoom finder apparatus having the above-described configuration, the cam pins 85 and 86 are respectively moved to the photographing lens storage movement section d3 in association with the driving of the zoom photographing optical system. When the zoom finder optical system is in the wide-angle end state, the first and second lens groups L1 and L2 are positioned farthest from each other, and the prism frame 36 rotates about the rotation support shaft 35. Then, the luminous flux of the zoom finder optical system is retracted to a position where it is not blocked.

When the zoom photographing optical system shifts to the zoom area from this state, the cam plate 15 moves to the right in FIG. 8 in conjunction with this, so that the cam pin 85 moves to the cam groove 21 in the zoom section d1. The cam pin 86 is guided and moves to the object side, and the cam pin 86 moves to the eyepiece side and then to the object side. By moving the first and second lens units L1 and L2, which are variable power lens units, in the optical axis direction in such a predetermined relationship, the magnification of the zoom finder optical system becomes the magnification of the zoom photographing system. Will be changed accordingly.

When the cam plate 15 further moves to the right in FIG. 2 during the transition to the macro transition section d2, the prism frame 36 is provided in a state where the first and second lens groups L1 and L2 are in the tele end region. Is rotated counterclockwise in FIG. 8 to position the correction prism 40 at the correction position shown in FIG. Further, when the cam plate 15 moves to the left in the figure during the transition from the macro transition section d2 to the zoom section d1, the prism frame 36 is rotated clockwise in the figure to position the correction prism 40 at the retracted position. .

On the other hand, when performing panoramic photography, the operation knob 110 protruding rearward of the camera body 9 is rotated. As a result, when the rotation driving member 67 rotates counterclockwise in FIG. 1 about the rotation support shaft 66, the rotational movement of the rotation driving member 67 reaches the light shielding plate 70 via the engagement protrusion 67c and the engagement elongated hole 70e, and The linear motion is transmitted to the linear drive lever 65 via the engagement protrusion 67a and the engagement elongated hole 65e.

Therefore, the screen size switching mechanism 69 switches the pair of light blocking plates 70 and 71 to the shooting opening 11 by instantaneously rotating them by the snap action mechanism to switch the shooting screen size to the panoramic size. At the same time, the pair of light shielding plates 63 having the rotation transmission portions 63d engaged with the engagement grooves 65c of the linear drive lever 65 pulled by the engagement protrusions 67a rotate about the rotation shaft portions 63b and 63c, respectively. Each of the field-of-view restricting portions 63a is advanced into the optical path of the finder optical system so as to have a panoramic size in which a fixed width above and below the field frame 45 is shielded.

[0027]

[Effect of device]

 As described above, according to the present invention, the pair of light-shielding plates and the operation member for moving the pair of light-shielding plates to the advance position within the finder field of view or the retreat position from the finder field of view are provided. Since the urging member that urges in the direction of retracting from the position or viewfinder is provided in the same member, the number of parts can be reduced, the device configuration can be simplified, and the viewfinder device can be further downsized. It becomes possible.

[Brief description of drawings]

FIG. 1 is a front view of a camera showing an interlocking structure of a light-shielding plate for changing a viewfinder field size according to the present invention and a screen size switching mechanism.

FIG. 2 is a view from the front of the camera, showing a panorama switching state of the interlocking structure of the light shielding plate for changing the viewfinder field size and the screen size switching mechanism.

FIG. 3 is a cross-sectional view showing an interlocking structure of a linear drive lever and a light shielding plate, as viewed from the rear side of the camera.

FIG. 4 is a perspective view showing a positional relationship between the prism shown in FIG. 3, a fourth lens group, and a light shielding plate arranged between the prism and the fourth lens group.

FIG. 5 is a perspective view showing a unitary shape of a linear drive lever according to the present invention.

FIG. 6 is an enlarged view showing a main part of the interlocking structure of FIG.

FIG. 7 is an enlarged view showing a main part of the interlocking structure of FIG. 1 in a state different from that of FIG.

FIG. 8 is a cross-sectional plan view showing a state in which the zoom finder optical system of the zoom finder device is in a photographing lens storage transition section.

FIG. 9 is a plan view showing a single shape of a cam plate.

FIG. 10 is a perspective view showing an appearance of a zoom finder device to which the present invention is applied.

FIG. 11 is a perspective view of a camera to which the present invention is applied, viewed from the back side.

[Explanation of symbols]

 10 Camera 12 Zoom Finder Device 13 Frame 15 Cam Plate 17 Finder Eyepiece Window 45 Field of View Frame 57 Prism 63 Light Shield 63a Field of View Restricting Part 63b 63c Rotating Shaft 63d Rotation Transmission Part 65 Linear Drive Lever (Operating Member) 65c Engagement Groove 65d Spring portion (biasing means) 66 Rotating support shaft 67 Rotation driving member 69 Screen size switching mechanism 70 71 Light-shielding plate L1 First lens group L2 Second lens group L3 Third lens group L4 Fourth lens group L5 Fifth lens group

Claims (1)

[Scope of utility model registration request] 1. A pair of light-shielding plates, which are provided so as to be able to move forward and backward on opposite sides of a substantially rectangular finder field and move to a retracted position and an advanced position to change the size of the finder field between large and small; An operation member for moving the pair of light-shielding plates to the advance position into the viewfinder field or the retracted position from the viewfinder field; and the pair of light-shielding plates to the advance position into the viewfinder field or the retracted position from the viewfinder field And a biasing member for biasing the biasing member in a direction toward the direction, the biasing member being integrally formed with the operating member.