JPH0876237A - Picture size switching mechanism of camera - Google Patents

Abstract

PURPOSE: To provide a picture size switching mechanism which does not require to provide an energizing means in particular, for removing the play, etc., of the mechanical system. CONSTITUTION: The picture size switching mechanism has first and second light shielding plates 11 and 12 slidably provided to change the boundary in two directions of a picture frame. A driving member 20 driving the light shielding plates is provided with first and second arms 20b and 20c extended to both sides from a base part 20a as the center of turning and engaged with the light shielding plates 11 and 12 respectively and these arms are constituted of an elastic member so as to press the light shielding plates 11 and 12 by deformation in both end parts in the sliding ranges of the light shielding plates regulated by stoppers.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen size switching mechanism of a camera used for switching between standard and panoramic shooting formats.

[0002]

2. Description of the Related Art Conventionally, a camera provided with a screen size switching mechanism for switching between standard and panoramic shooting formats has been used. The conventional switching mechanism changes the screen size by symmetrically moving the upper and lower two light shielding plates provided between the taking lens and the film surface to adjust the width of the screen in the short side direction. There is.

The upper and lower shading plates are driven in a direction in which they approach each other or move away from each other by a driving member interlocked with the operation of a switching knob or the like provided in the camera body. A light blocking member is provided between each light blocking plate and the camera body in order to remove mechanical play, play, etc. between the switching knob and the driving member or between the driving member and the light blocking plate. A biasing means such as a coil spring or a torsion spring that biases the side is provided.

[0004]

However, in the above-mentioned conventional screen size switching mechanism, it is necessary to provide a biasing means such as a spring separately from the driving member and the like in order to remove play and play in the mechanical system. Because there are many parts,
There was a problem that assembly was poor.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and a screen size switching mechanism which does not require any special urging means for removing looseness or play of a mechanical system. The purpose is to provide.

[0006]

In order to achieve the above-mentioned object, a camera screen size switching mechanism according to the present invention has an operating member that can be locked at first and second predetermined positions, and an image pickup by the camera. A light blocking member that is provided in the vicinity of the image plane of the lens and that is movable within a predetermined range for changing the image capturing screen size, and movement of the operating member between the first and second predetermined positions. And a stopper member that engages with the light shielding member and regulates a movement range of the light shielding member within a predetermined range in cooperation with the drive unit. When the operation member is locked at any of the first and second predetermined positions, the elastic member is elastically deformed in a state in which the light blocking member and the stopper member are engaged with each other. Characterized by causing There.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the screen size switching mechanism of the camera according to the present invention will be described below. As shown in FIG. 1, the screen size switching mechanism 10 according to the embodiment is applied to a lens shutter type compact camera 1, and is a film for guiding a loaded film in the vicinity of an image forming surface of a photographing lens. It is provided inside the guide 2.

Inside the compact camera 1, a cartridge chamber 3 is formed on one side of the film guide 2 and a spool chamber 4 is formed on the other side, and these are closed by a back lid 5. A main switch 6, a shutter button 7, and a display panel 8 are provided on the upper surface of the camera 1, and a back cover 5 is provided.
A finder window 9 and a slide knob 21 for switching a photographing format, which constitutes a part of the screen size switching mechanism 10, are arranged on the upper side of.

As shown in FIGS. 1 and 2, the screen size switching mechanism 10 includes a first light shielding plate 11 slidably provided so as to change one boundary of the screen, and a first light shielding plate 11. And a second light shielding plate 12 that is slidably provided so as to change the other boundary of the screen.

The first and second light shielding plates 11 and 12 each have two elongated holes 11a and 11 extending in the sliding direction.
b, 12a, 12b are formed, and pins 13a, 13b, 14 as stoppers which engage with these long holes and regulate the sliding range of the light shielding plate are formed on the camera body side.
Projections a and 14b are provided.

A drive member 20 for driving the light shielding plate is rotatably provided on the camera body, and has a base portion 20a as a rotation center and first and second light shielding plates extending from the base portion to both sides. First and second arms 20b, 20 that engage with each other
and c. Pins 11c and 12c are provided on the first and second light shielding plates 11 and 12, respectively, and pins 11c and 1 are attached to the tips of the first and second arms 20b and 20c, respectively.
Long holes 20b 'and 20c' with which 2c are respectively engaged are formed.

With such a structure, the light blocking plates 11 and 12
Are separated from each other within a range regulated by the stopper by the rotating operation of the driving member 20, and are driven in a direction approaching each other. Then, the first and second arms deform the light blocking plates 11 and 12 at the positions at both ends of the sliding range of the light blocking plate which is regulated by the stoppers, and the pins 13a and 13 are moved.
It is composed of an elastic member so that it can be pressed against b, 14a and 14b.

Further, the drive member 20 is provided with an operated portion 20d having a U-shaped groove extending from the base portion 20a in a direction different from that of the arms 20b and 20c. The pin 21a is arranged so as to engage with the groove of the operated portion 20d.

The slide knob 21 functions as an operating member that engages with the operated portion at a position where it can be operated from the outside and rotates the drive member. The slide knob 21 is provided with a click spring 21b at a position inside the camera body.
Is attached, and the camera body 1 is formed with two grooves 1a and 1b with which the click spring 21b is engaged. The click spring 21b and the grooves 1a and 1b are
The driving member 20 functions as a positioning unit that positions the driving member 20 so that the driving member 20 is locked at a position where the first and second light blocking plates are pressed against the stopper.

Next, the operation of the screen size switching mechanism according to the embodiment will be described with reference to FIGS. 3 and 4.

When defining the standard photographing format,
As shown in FIG. 3, the light shielding plates 11 and 12 are held in a state of being retracted from the aperture. When the slide knob 21 is moved from the left side to the right side in the figure, the drive member 20 rotates clockwise and the first and second light shielding plates 11 and 12 contact the pins 13a, 13b, 14a and 14b. Slide to the contact position.

When the slide knob 21 is further moved to the right side, the light shielding plates 11 and 12 have already reached the end portions of the movement range, so that the drive member 20 deforms the arms 20b and 20c and only the base portion 20a rotates. To do. Then, the click spring 21b engages with the first groove 1a and the slide knob 2
1 is positioned, the drive member 20 moves the arm 20b,
The light blocking plates 11 and 12 are positioned while being elastically biased by the elastic force due to the deformation of 20c.

On the other hand, when defining the panoramic photography format, as shown in FIG. 4, the light shielding plates 11 and 12 are held in the aperture so that the upper and lower portions of the screen are shielded so that a horizontally long exposure range can be obtained. Stipulated.

When the slide knob 21 is moved from the right side to the left side in the figure, the driving member 20 is rotated counterclockwise and the first and second light shielding plates 11 and 12 are moved to the pins 13a and 13, respectively.
Slide to a position where it abuts b, 14a, 14b.

When the slide knob 21 is further moved to the left side, the light shielding plates 11 and 12 have already reached the end portions of the movement range, so that the drive member 20 deforms the arms 20b and 20c and only the base portion 20a rotates. To do. Then, the click spring 21b engages with the second groove 1b and the slide knob 2
1 is positioned, the drive member 20 moves the arm 20b,
The light blocking plates 11 and 12 are positioned while being elastically biased by the elastic force due to the deformation of 20c.

[0021]

As described above, according to the present invention, by making the driving member itself elastic, it is possible to shield the light based on backlash and play of the mechanical system without separately providing a biasing means such as a spring. Eliminates the instability of the board position,
It becomes possible to hold the light shielding plate at a predetermined position.

[Brief description of drawings]

FIG. 1 is a perspective view showing an entire camera in which a screen size switching mechanism according to the present invention is incorporated.

FIG. 2 is a perspective view when defining a standard shooting format of the screen size switching mechanism according to the embodiment.

FIG. 3 is a front view of the screen size switching mechanism according to the embodiment when defining a standard shooting format.

FIG. 4 is a front view when defining a panoramic shooting format of the screen size switching mechanism according to the embodiment.

[Explanation of symbols]

 1 camera body 1a groove 1b groove 10 screen size switching mechanism 11 light-shielding plate 11a, 11b long hole 11c pin 12 light-shielding plate 12a, 12b long hole 12c pin 13a, 13b, 14a, 14b pin 20 driving member 20a base 20b, 20c arm 20a ', 20b' long hole 20d operated part 21 slide knob 21a drive pin 21b click spring

Claims (10)

[Claims] 1. An operating member which can be locked at first and second predetermined positions, and which is provided in the vicinity of an image forming surface of a photographing lens of the camera, and moves within a predetermined range to change the photographing screen size. A light-shielding member that is provided, a drive unit that moves the light-shielding member in association with the movement of the operation member between the first and second predetermined positions, and engages with the light-shielding member, A stopper member for restricting a movement range of the light shielding member within a predetermined range, the driving means has an elastic member, and the operation member is at any one of the first and second predetermined positions. A screen size switching mechanism for a camera, characterized in that, when locked, the elastic member is elastically deformed in a state where the light blocking member and the stopper member are engaged with each other. 2. The light-shielding member is disposed so as to be slidable so as to change the position of one boundary of the screen, and is arranged so as to face the first light-shielding plate. The second light shielding plate slidably provided so as to change the position of the boundary opposite to the one boundary.
The screen size switching mechanism of the camera. 3. The screen size switching mechanism for a camera according to claim 2, wherein said stopper member has first and second stoppers for restricting a sliding range of said first and second light shielding plates. . 4. The first and second light shielding plates are slidable along the short side direction of the photographing screen, and the driving means separates and approaches the first and second light shielding plates from each other. The screen size switching mechanism of the camera according to claim 1, wherein the screen size switching mechanism is driven to operate. 5. The driving means is rotatably provided on the camera body, extends from both sides of a base portion which is the center of rotation, engages with the first and second light shielding plates, and slides symmetrically. A drive member having first and second arms, wherein the first and second arms deform the deformation of the light blocking plate at positions at both ends of a sliding range of the light blocking plate regulated by the stopper. 4. The screen size switching mechanism for a camera according to claim 3, wherein the elastic member is configured to press the stopper. 6. The driven member is provided with an operated portion extending from the rotation center in a direction different from that of the arm, and the operating portion is provided so as to be operable from outside the camera, and the operated portion is attached to the operated portion. The screen size switching mechanism for a camera according to claim 5, further comprising an operation member that is engaged to rotate the drive member. 7. The operating member includes a positioning means for positioning the driving member so that the driving member is locked at a position where the first and second light shielding plates are pressed against the stopper. The screen size switching mechanism of the camera described in. 8. The screen size switching of a camera according to claim 7, wherein the positioning means is composed of two grooves provided on the camera body and a click spring engaging with the grooves. mechanism. 9. A pin is provided on each of the first and second light-shielding plates, and an elongated hole with which the pin engages is formed at a tip of each of the first and second arms. The screen size switching mechanism of the camera according to claim 5, wherein 10. An elongated hole extending in the sliding direction is formed in each of the first and second light shielding plates, and at least two stoppers are provided on the camera body so as to engage with the elongated hole. The screen size switching mechanism of the camera according to claim 5, wherein the screen size switching mechanism is configured by the following pins.