JP3207961B2 - Camera with switchable shooting screen size - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera capable of switching a photographing screen size, and more particularly to a mechanism for switching a photographing screen size.

[0002]

2. Description of the Related Art Conventionally, a roll film having a width of 35 mm and a normal size of 36 mm called a Leica size have been used.
Various proposals have been made for a camera switching mechanism capable of switching between a shooting screen size of 24 mm and a shooting screen size of 36 mm × 13 mm, which is called a panorama size. For example, in the camera disclosed in Japanese Patent Application Laid-Open No. 3-238440, an interlocking pin is protruded from one end of an upper photographing screen size switching member, and one end of the lower photographing screen size switching member is attached to the camera body. A rack meshing with the provided connecting gear is formed, and the connecting pin is moved by the connecting plate body, and at the same time, the connecting gear is rotated to cause the upper and lower photographing screen size switching members to be upside down. Direction to switch to the normal size, and also to directions close to each other to switch to the panoramic size.

A rack is formed at one end of each of the upper and lower photographing screen size switching members, and first and second coupling gears are respectively meshed with the respective racks. The third gear is meshed with the coupling gear, and the third and second coupling gears are meshed with the fan-shaped teeth formed at both ends of the coupling plate, and the coupling plate is rotated. In some cases, the upper and lower photographing screen size switching members are moved in the vertical direction to switch the screen size.

Further, Japanese Patent Application No. Hei.
In the camera for switching the photographing screen size of No. 084065, a mask member for switching the photographing screen size is provided between the aperture of the camera body and the film, and is moved in the vertical direction on a mask support fixed to one end of the mask member. By screwing the feed screw shaft as much as possible and rotating the feed screw shaft, the mask member is moved up and down to switch the shooting screen size, and the switching mechanism is connected to the spool chamber of the camera body. It is arranged in a guide groove formed between the aperture and the aperture.

[0005]

The technique disclosed in Japanese Patent Laid-Open Publication No. Hei 3-238440 has a drawback that the mechanism for switching the photographing screen size is complicated and a large space for arranging the mechanism is required. is there. In the switching mechanism of Japanese Patent Application No. 4-0800655, a guide groove for disposing the mask support and the feed screw shaft is provided between the spool chamber and the aperture.
There is a problem that the lateral dimension of the camera becomes longer.

The present invention has been made in view of the above problems, and provides a camera capable of switching a photographing screen size without increasing the size of the camera by arranging a screen size switching mechanism in a small space. The purpose is to:

[0007]

According to the first aspect of the present invention, there is provided a camera capable of switching a photographing screen size by switching a photographing screen size by covering a part of an aperture provided in a camera body. In, a rotating shaft rotatably provided in the vicinity of the aperture, a mask member that moves to a position that covers a part of the aperture and a retracted position, and that defines a shooting screen size,
Urging means for urging the mask member in a direction defined by a predetermined photographing screen size, and a string-shaped member connecting the mask member and the rotation shaft , wherein the rotation shaft is a predetermined
The cord-like member in accordance with the
By winding the mask around the shaft, the mask
It is characterized in that the material is moved against the urging force of the urging means . In addition, the second shooting screen size cutoff according to the present invention.
The interchangeable camera switches the first shooting screen size
In a possible camera, one end of the cord is connected to the
Part of the string-shaped member
It is characterized by being fixed to the outer periphery of the rotating shaft. Sa
Furthermore, the third shooting screen size can be switched according to the present invention.
The camera is a camera capable of switching the first shooting screen size.
In the above, the string-shaped member is separated from the mask member by the
Guide in a direction almost along the rotation axis, and
In order to wind the cord-like member around the rotation shaft,
Guide means for changing the direction substantially perpendicular to the rotation axis
It is characterized by having. Furthermore, the present invention
The camera capable of switching the photographing screen size of No. 4 is the first camera described above.
For cameras that can switch the shooting screen size,
The shaft and the cord-like member are spools provided on the camera body.
A film wound around a film take-up spool in a room
Out of the storage area and close to the aperture.
It is characterized in that it is arranged in a gap portion that can be cut.

[0008]

[Operation] In the above configuration, the rotation axis is in a predetermined direction.
In response to the rotation, the outer periphery of the string-shaped member of the rotary shaft
By going wound on, switching the picture-format is moved against the mask member the biasing force of the biasing means.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. 1 to 4 are a perspective view, a plan view, and a cross-sectional view of a screen size switching mechanism in a camera capable of switching a photographing screen size according to a first embodiment of the present invention. As shown in FIGS. 1 and 2, one side of the back of the camera body 1 has a patrone chamber 1 in which a film patrone is loaded.
a spool chamber 1b in which the film take-up spool 2 is rotatably arranged on the other side.
Is provided.

At the center of the camera body 1, behind a photographic lens (not shown), a film (not shown) stretched between the patrone chamber 1a and the spool chamber 1b.
The aperture 1c for determining the shooting angle of view is formed. The upper portion and the lower portion immediately after the aperture 1c are formed of strip-shaped thin plates extending in the horizontal direction along the running direction of the film, and can move in the vertical direction in parallel with the opening surface of the aperture 1c. Movement of the aperture 1c
Mask members 4 and 5 for masking the upper and lower ends are provided. The mask members 4 and 5 are retracted above and below the aperture 1c at the time of normal normal-size shooting, and the entire opening of the aperture 1c is used as an exposure range. The mask members 4 and 5 penetrate into the aperture 1c to cover the upper and lower portions of the aperture 1c, and set the horizontal central portion of the aperture 1c as an exposure range.

A drive section for the mask members 4 and 5 is provided in a space near the aperture in the spool chamber 1b. That is, when the maximum number of films (for example, a 35 mm wide roll film of 36 shots) has been completely wound on the spool 2, the portion from the aperture 1 c outside the film storage range 3 is inside the spool chamber 1 b. Has a gap. In the present invention, the mask driving unit is disposed in the gap by utilizing the gap. The mask driving unit includes the mask support units 4a and 5a, the rotating shaft 13, the mask springs 6 and 7, the string member 14, and the like.

That is, mask support portions 4a and 5a projecting forward are formed at one ends of the spool chambers 1b of the mask members 4 and 5, respectively.
a, 5a are provided with circular through-holes 4b, 5b in the up-down direction.
A rotatable shaft 13 rotatably supported is inserted therethrough.
Therefore, the mask members 4 and 5 move vertically with respect to the rotation shaft 13. The mask supporting portions 4a and 5a are disposed so that one side surface 4c (see FIG. 2) facing the spool chamber 1b slides with respect to one side wall surface 1d on the aperture side of the spool chamber 1b. This prevents the mask members 4 and 5 from rotating with respect to the center axis of the rotating shaft 13.

The mask supporting portions 4a, 5a are provided with spring hooking pins 4e, 5e projecting from the other side surfaces 4d, 5d opposite to the one side surfaces 4c, 5c. Mask springs 6, 7, which are elastic springs, are hung between the camera body 5e and the camera body 1, respectively, and urge the mask members 4, 5 upward and downward, respectively. Therefore, the mask members 4 and 5 are at the normal photographing position in the normal life. Both ends of the string-shaped member 14 are fixed (not shown) to the front surfaces of the mask support portions 4a and 5a, respectively. The camera body 1 near the center between the mask support portions 4a and 5a is provided with guide shaft portions 1e and 1f projecting vertically, and the center portion of the cord-like member 14 is The guide shafts 1 e and 1 f guide the guide shaft 1 from the substantially vertical direction to the rearward substantially horizontal direction, and are fixed to a locking projection 13 a protruding from the center of the rotary shaft 13.

Further, when the mask members 4 and 5 are retracted above and below the aperture 1c during normal photographing, respectively, at the upper and lower ends of the one side wall 1d of the spool body 1b of the camera body 1, The mask support portions 4a, 5
Normal stoppers 1g and 1h are provided so as to be in contact with a part of the upper surface and the lower surface of "a" to position the mask members 4 and 5, respectively. The lower and upper surfaces of the mask supporting portions 4a and 5a are positioned at the middle of the one side wall surface 1d when the mask members 4 and 5 are respectively inserted into the upper and lower portions of the aperture 1c during panoramic photographing. Panorama stoppers 1i and 1j that abut on a part of the upper surface and position the mask members 4 and 5 are protrudingly provided.

An aperture switching gear 15 is fixed to the upper end of the rotating shaft 13, and a gear locking pin 15a is protruded from the lower surface of the gear 15, and is driven by a driving system (not shown). Gear 15 moves counterclockwise (FIG. 4).
(See the arrow CCW direction of FIG. 3), when the gear 15 engages with the main body locking projection 1k protruding from the upper surface of the camera main body 1 near the rotation shaft 13 to rotate the gear 15. It is to be stopped. At this time, the mask members 4 and 5 are in a state at the time of normal photographing.

Immediately after the aperture 1c in which the mask driving section is provided, a pressure plate rail 8a and a film rail 8b are formed at the upper and lower portions of the rear surface, and have the same shape and the same size as the aperture 1c. A rail member 8 having an opening 8c formed in the center is opposed to the aperture 1c, and a gap 8 for the mask members 4 and 5 to move in the vertical direction.
d (see FIG. 2). In order to have the gaps 8d, projecting portions 8e having the same width as the gaps are formed at the centers of both side edges of the front surface of the rail member 8 respectively. The rail member 8 thus formed is fixed to the camera body by screws 9 inserted into screw holes drilled at the center on both sides of the opening 8c.

On the other hand, the spool chamber 1b is provided with a film holding mechanism for holding the film (not shown) from spreading when the film is wound on the spool. This mechanism, as shown in FIG.
A guide shaft 12 is fixed to the camera body 1 in a recess formed in the middle of the one side wall surface 1d of the spool chamber 1b, and the base end of the curved guide plate 10 is attached to the guide shaft 12. The portion 10a is disposed rotatably. A torsion spring 11 is wound around the guide shaft 12, and the extended one leg end of the torsion spring 11 contacts one side wall surface of the spool chamber 1 b,
The other leg end of the spring 11 that is extended is fixed to the guide plate 10. Therefore, the guide plate 10 is connected to the spring 1
1, the guide roller 16 rotatably supported by the roller supporting portion 10b at the tip end of the guide plate 10 is urged toward the spool by the expanding elastic force. The film wound in 2 is constantly pressed against the spool.

Next, the operation of the screen size switching mechanism of the camera of the first embodiment configured as described above and capable of switching the photographing screen size will be described. As shown in FIG. 1, from the normal photographing state in which the mask members 4 and 5 are retracted above and below the aperture 1c, the gear 15 is moved in the CW direction (clockwise direction) shown in FIG. When the rotary shaft 13 is rotated to
Start winding. Then, the mask support portions 4a, 5a
The mask members 4, 5 start moving downward and upward, respectively, while charging the mask springs 6, 7. When the gear 15 is further rotated and the rotating shaft 13 continues to wind the cord-like member 14, the mask supporting portions 4a,
5a come into contact with the panorama stoppers 1i, 1j, respectively, and the movement of the mask members 4, 5 stops.

At the same time, the gear locking pin 15a of the gear 15 comes into contact with the body locking projection 1k of the camera body 1, and the rotation of the gear 15 is stopped. Since the mask springs 6 and 7 are charged by this operation, the mask members 4 and 5 are pulled upward and downward by the compressive elasticity of the springs 6 and 7, respectively, and move. This is prevented by holding the gear 15 in a stopped state by a locking mechanism that is not performed. In this state, the mask member 4,
5 covers the upper and lower portions of the aperture 1c,
As shown in FIG. 4, a panorama-size shooting state is set.

Next, in order to set the photographing state to the normal size, the locking of the gear 15 is released, and the gear 15 is rotated in the direction of the arrow CCW (counterclockwise) by a driving source (not shown). Then, the string-shaped member 14 wound around the rotating shaft 13 is unwound and loosened, so that the mask supporting portions 4a and 5a are moved upward and downward by the compressed elastic force of the charged mask springs 6 and 7, respectively. Start moving. When the gear 15 is further rotated, the mask support portions 4a and 5a abut against the normal stoppers 1g and 1h, respectively, and the movement of the mask members 4 and 5 stops.

At the same time, the gear locking pin 15a of the gear 15 is
Then, the driving of the gear 15 is stopped. Here, the mask members 4 and 5 are maintained in a stopped state by being urged by the mask springs 6 and 7, and the gear 1
5 is prevented from rotating by a locking mechanism. In this state, the mask members 4 and 5 are retracted above and below the aperture 1c, and a normal size photographing state is set as shown in FIG.

According to the first embodiment, the screen size switching mechanism can be realized with a simple structure, and since the mechanism is compact, it can be disposed in the gap outside the film storage area in the spool chamber. The screen size switching mechanism can be configured without increasing the size of the camera.

FIGS. 5 to 9 are a perspective view, a transverse sectional view, and a vertical sectional view of a main part of a screen size switching mechanism in a camera capable of switching a photographing screen size according to a second embodiment of the present invention. The second embodiment differs from the first embodiment in the mechanism for moving the mask member. That is, the mask member slides in the vertical direction in the first embodiment, whereas the mask member rotates in the second embodiment. Other configurations are substantially the same as those of the first embodiment. Therefore, only the differences will be described, and the same components will be denoted by the same reference numerals and description thereof will be omitted.

As shown in FIGS. 5 and 6, the aperture 1c
A pair of mask members 4B, 4B,
5B is rotatably arranged. This mask member 4
B and 5B are formed from a horizontally long plate material which is formed in a streamline shape which extends in the horizontal direction along the running direction of the film and has a wide base at a vertical cross section and a continuous end at a narrow end. Has become.

[0025] The mask member 4B, 5 B, the shaft 4f protruding right and left in its base, 4 h, 5f, 5 h are formed integrally, cartridge chamber of the axles camera body 1A Fitting holes 1m, 1o, 1t, 1n respectively formed in the upper and lower portions of each inner wall of the spool chamber 1a and the spool chamber 1b.
By being inserted rotatably in, it is disposed to cover the upper and lower portions of the aperture 1c openably.

That is, the spool chamber 1 of the upper mask member 4B
shaft 4h protruding b side protrudes into the spool chamber 1b through the fitting holes 1 n, the support shaft 5h fitting hole 1o protruding spool chamber 1b side of the lower mask member 5B It penetrates and protrudes into the spool chamber 1b, and two flanges are fixed to each protruding end thereof. Winding portions 4i and 5i of the string member 14 are formed between the two flanges. Each end of the string-like member 14 is fixed to the portions 4i and 5i. The patrone chamber 1 of the upper mask member 4B is also provided.
shaft 4f projecting toward the side a is fitted rotatably into the fitting hole 1t, spindle 5f protruding toward the cartridge chamber 1a Gawani of lower mask member 5B in the fitting hole 1 m It is rotatably fitted.

A notch 4 for applying a spring is provided at an edge of the mask members 4B and 5B around the support shafts 4f and 5f.
j, 5j is provided, the notch 4j, each shaft 4f to 5j, one end of the coil spring 17, 18 fitted to 5f are passed over, respectively. This spring 17,1
The other ends of the reference numerals 8 are respectively hooked at appropriate positions of the camera body 1A. Therefore, the upper mask member 4B is given a habit of rotating clockwise (N1 direction shown in FIG. 8) around the center axis of the support shafts 4f and 4h by the light elasticity of the coil spring 17, and has a lower portion. The mask member 5B is given a habit of rotating counterclockwise (N2 direction shown in FIG. 8) around the central axes of the support shafts 5f and 5h by the coil spring 18. The rotation of the upper mask member 4B in the N1 direction is
The rotation of the lower mask member 5B in the N2 direction is prevented by the normal stopper 1q protruding from the inner wall of the patrone chamber 1a. The upper and lower mask members 4B and 5B are rotated at positions where the free end 4e of the upper mask member 4B and the free end 5e of the lower mask member 5B are separated from the upper and lower portions of the aperture 1c. , The upper and lower mask members 4B and 5B are in a horizontal position, and open the aperture 1c from the front.

Further, when the upper mask member 4B is rotated counterclockwise (P1 direction shown in FIG. 8) around the center axis of the support shafts 4f and 4h by a mask driving section described later, the mask member 4B is moved to the cartridge. The lower mask member 5B is blocked by the panorama stopper 1r protruding from the inner wall of the chamber 1a, and the lower mask member 5B is rotated clockwise around the central axis of the support shafts 5f and 5h (FIG. 8).
(P2 direction shown in FIG. 2), the patrone chamber 1
The upper and lower mask members 4B, 4B,
The rotation position of 5B is a position where the free ends 4e and 5e of the upper and lower mask members 4B and 5B cover the upper and lower portions of the aperture 1c, respectively, and the upper and lower mask members 4B and 5B are in the standing position, respectively. To make the aperture 1c a horizontally long panoramic size.

As described above, the mask members 4B and 5B are
During normal normal-size shooting, the aperture 1
c, and retreats upward and downward immediately before c.
In contrast, when taking a panorama size image, the mask members 4B and 5B penetrate into the aperture 1c to cover the upper and lower portions of the aperture 1c, and the horizontal length of the aperture 1c. Is the exposure range.

The driving portions of the mask members 4B and 5B have substantially the same construction as those of the first embodiment, and therefore the description thereof is omitted.

Next, the operation of the screen size switching mechanism of the camera having the above-mentioned configuration and capable of switching the photographing screen size according to the second embodiment will be described. The mask members 4B and 5B
In order to switch from the normal photographing state (see FIG. 8) retracted above and below the aperture 1c to the panoramic photographing state (see FIG. 9), the gear 15 is turned by an unillustrated drive source so that the arrow shown in FIG. When rotating in the clockwise direction of P (CW direction), the rotating shaft 13 starts winding the string-shaped member 14. The string winding portions 4i and 5i of the mask members 4B and 5B have both ends 14
a, 14b are wound, so that the string-shaped member 1
4 is pulled downward and upward. Then, the mask members 4B and 5B start rotating in the directions of arrows P1 and P2 (see FIG. 8) while charging the mask springs 17 and 18, respectively. When the gear 15 is further rotated and the rotating shaft 13 continues to wind the string-shaped member 14, the mask members 4B and 5B abut against the panorama stoppers 1r and 1s, respectively, and the mask members 4B and
The rotation of 5B stops.

At the same time, the gear locking pin 15a of the gear 15 comes into contact with the body locking projection 1k of the camera body 1A, and the rotation of the gear 15 is stopped. In addition, this operation allows the mask springs 17, 1
8 is charged, the mask members 4B and 5B try to rotate in the directions of arrows N1 and N2 (see FIG. 9) by the release elasticity of the springs 17 and 18, respectively. This is prevented by holding the gear 15 in a stopped state by a mechanism. In this state, the mask members 4B and 5B cover the upper and lower portions of the aperture 1c, so that a panorama-sized shooting state is obtained as shown in FIG.

Next, in order to switch from the panorama size shooting state to the normal size shooting state, the gear 1 is used.
5 is released, and the gear 15 is rotated in a counterclockwise direction (CCW direction) indicated by an arrow N by a drive source (not shown). Then, the string member 14 wound around the rotating shaft 13 is unwound and loosened, so that the mask members 4B and 5B are released by the released elasticity of the charged mask springs 17 and 18 so that the string member 14 is released.
Starts to rotate in the directions of the arrow N1 and the arrow N2 (see FIG. 9), respectively, while being wound on the string winding units 4i and 5i. Further, the gear 15 is rotated, and the mask members 4B and 5B abut against the normal stoppers 1p and 1q, respectively, and the rotation of the mask members 4B and 5B is stopped.

At the same time, the gear locking pin 15a of the gear 15 comes into contact with the body locking projection 1k of the camera body 1A, and the rotation of the gear 15 is stopped.
Here, the mask members 4B and 5B are connected to the mask spring 1.
The stopped state is maintained by being biased by the springs 7 and 18, and the rotation of the gear 15 is prevented by the locking mechanism. In this state, the mask members 4B and 5B have been retracted upward and downward immediately before the aperture 1c, so that a normal size photographing state is obtained as shown in FIG.

According to the second embodiment, the screen size switching mechanism can be realized with a simple structure, and since the mechanism is compact, it can be arranged in the gap outside the film storage area in the spool chamber. Since the screw portion is not used for the rotating shaft, it is possible to configure a screen size switching mechanism that does not increase the size of the camera and can reduce the processing cost of the screw portion.

Next, FIGS. 10 to 13 are perspective views of a camera capable of switching a photographing screen size according to a third embodiment of the present invention.
It is a top view and a sectional view. As shown in FIG. 10, the mask members 4A and 5A of the third embodiment use a screw feed mechanism instead of the string-like member 14 and the mask springs 6 and 7 of the first embodiment. That is, the mask support 4
a, 5a formed in the through holes 4b, 5b,
Female screws of a left screw and a right screw are respectively threaded to form screw holes 4g and 5g, and these screw holes 4g and 5g are formed.
A feed screw shaft 13A having an upper portion formed with a left male screw portion 13b and a lower portion formed with a right male screw portion 13c is screwed into g. Therefore, the rotation of the feed screw shaft 13A causes the mask members 4A and 5A to move up and down in opposite directions. That is, the feed screw shaft 13A
However, as shown in FIG. 13, when rotated in the direction of arrow CCW, the mask members 4A and 5A move upward and downward, respectively, and when rotated in the direction of arrow CW, the mask members 4A and 5A move downward. And move up.

An aperture switching gear 15A is integrally fixed to the upper end of the feed screw shaft 13A, and is rotatably driven by a drive source (not shown). Other configurations are the same as in the first embodiment.

The operation of the screen switching mechanism of the camera of the third embodiment capable of switching the photographing screen size will be described. The gear 1 is driven by a drive source (not shown).
When 5A rotates in the direction of arrow CCW, the feed screw shaft 13A also rotates in the direction of arrow CCW. Then, by the screwing of the feed screw shaft 13A and the mask supporting portions 4a and 5a, the mask members 4A and 5A start moving upward and downward, respectively. When the rotation is further continued, the mask members 4A and 5A come into contact with the normal stoppers 1g and 1h, respectively, so that the movement of the mask members 4A and 5A is stopped and the rotation of the feed screw shaft 13A is also stopped. Then, a drive source (not shown) holds the gear 15A in a stopped state. In this state, the mask members 4A and 5A are retracted above and below the aperture 1c, so that a normal size photographing state is set.

Next, when the gear 15A rotates in the direction of arrow CW by a drive source (not shown), the feed screw shaft 13A rotates in the direction of arrow CW. Then, by the screwing of the feed screw shaft 13A and the mask supporting portions 4a, 5a, the mask members 4A, 5A start moving downward and upward, respectively. When the rotation is further continued, the mask member comes into contact with the panorama stoppers 1i and 1j, respectively, and the movement of the mask members 4A and 5A stops, and the rotation of the feed screw shaft 13A also stops. Then, a drive source (not shown) holds the gear 15A in a stopped state. At this time, since the mask members 4A and 5A cover the upper and lower portions of the aperture, the screen is in a panoramic size shooting state.

According to the third embodiment, since the screen size switching mechanism can be made compact and simple, the mechanism can be arranged in the gap outside the film storage area in the spool chamber, and the size of the camera can be increased. Instead, a screen size switching mechanism can be provided.

The vertical relationship between the screw thread of the feed screw shaft and the left and right threads threaded on the mask support in the third embodiment can be reversed. In this case, it is natural that the rotation direction of the aperture switching gear at the time of switching between normal shooting and panoramic shooting is reversed.

[0042]

As described above, according to the present invention, the photographing screen size switching mechanism is compactly configured by a simple mechanism, and the mechanism is arranged in an unused space inside the camera. It is possible to provide a camera capable of switching the photographing screen size without increasing the size of the camera.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a main part of a screen size switching mechanism in a camera capable of switching a photographing screen size according to a first embodiment of the present invention.

FIG. 2 is a plan view of a main part of the screen size switching mechanism of the first embodiment.

FIG. 3 is a central cross-sectional view of a main part showing a film holding mechanism of the camera of the first embodiment.

FIG. 4 is an essential part perspective view showing a state at the time of panorama size shooting in the screen size switching mechanism of the first embodiment.

FIG. 5 is an exploded perspective view of a main part of a screen size switching mechanism in a camera capable of switching a photographing screen size according to a second embodiment of the present invention.

FIG. 6 is a central horizontal cross-sectional view of a main part of the screen size switching mechanism of the second embodiment.

FIG. 7 is a central cross-sectional view of a main part showing a film holding mechanism of the camera of the second embodiment.

FIG. 8 is a vertical sectional view of a main part showing a state during normal size photographing in the screen size switching mechanism of the second embodiment.

FIG. 9 is a vertical sectional view of a main part showing a state at the time of panorama size shooting in the screen size switching mechanism of the second embodiment.

FIG. 10 is an exploded perspective view of a main part of a screen size switching mechanism in a camera capable of switching a photographing screen size according to a third embodiment of the present invention.

FIG. 11 is a plan view of a main part of a screen size switching mechanism according to the third embodiment.

FIG. 12 is a central cross-sectional view of a main part showing a film holding mechanism of the camera of the third embodiment.

FIG. 13 is an essential part perspective view showing a state at the time of panorama size shooting in the screen size switching mechanism of the third embodiment.

[Explanation of symbols]

1,1A {Camera body 1c} Aperture 4,4A, 4B, 5,5A, 5B {Mask member (mask means) 6,7,17,18} Mask spring (with 13 ‥‥‥‥ Rotating shaft (rotating shaft means) 14 ‥‥‥‥ String-like member (string-like means)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-152334 (JP, A) JP-A-63-81334 (JP, A) JP-A-4-349438 (JP, A) 320243 (JP, A) JP-A-57-198447 (JP, A) JP-A-57-90620 (JP, A) JP-A-58-1221027 (JP, A) JP-A-58-1221028 (JP, A) JP-A-2-195344 (JP, A) JP-A-4-234745 (JP, A) JP-A-5-40292 (JP, A) JP-A-3-62338 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) G03B 17/28

Claims (4)

(57) [Claims] 1. A camera capable of switching a photographing screen size by switching a photographing screen size by covering a part of an aperture provided in a camera body, comprising: a rotating shaft rotatably provided in the vicinity of the aperture; A mask member that moves to a position that partially covers and retracts to define a photographing screen size; a biasing unit that biases the mask member in a direction that defines a predetermined photographing screen size; and has a string member for coupling the said rotary shaft, according to the rotary shaft is rotated in a predetermined direction
Te, the string-like member by going wound around the outer periphery of the rotary shaft, picture-format switchable camera and moving the mask member against the biasing force of the biasing means. 2. An end of the string-shaped member is fixed to the mask member, and a part of the string-shaped member is connected to the rotating shaft.
2. The camera according to claim 1, wherein the camera is fixed to an outer periphery of the camera. 3. A method for guiding the string-shaped member from the mask member in a direction substantially along the rotation axis in proximity to the rotation axis,
2. The camera according to claim 1, further comprising guide means for changing a direction in a direction substantially perpendicular to the rotation axis in order to wind the string-like member around an outer periphery of the rotation axis. 4. A gap formed in a portion of the spool chamber provided in the camera body outside the film storage area wound around the film winding spool and near the aperture side, wherein the rotating shaft and the string-shaped member are provided. 2. The camera according to claim 1, wherein the camera is capable of switching a photographing screen size.