JP3173894B2 - Screen size switchable camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen size switchable camera, and more particularly to a screen size switchable camera capable of switching an exposure screen size to a predetermined desired size at the time of photographing.

[0002]

2. Description of the Related Art As is well known, various types of cameras capable of switching a photographing screen size have been conventionally provided. For example, using a roll film of 35 mm width, one of a full exposure screen size of 36 mm x 24 mm called a Leica size and a small exposure screen size of 18 mm x 24 mm called a half size is selected when loading a film. Cameras and the like that can do this are well known. Among them, recently, a large exposure screen size of a full size of 36 mm × 24 mm using the roll film and a panorama size of 36 mm are used.
Japanese Patent Application Laid-Open No. Sho 4 discloses a camera which can arbitrarily select a photographing screen size between a horizontal exposure screen size of about 13 mm × 13 mm and a film loaded.
-84065 and the like.

When the size of the exposure screen is switched between the full size and the panorama size as described above,
In order to determine the exposure frame, the size of the aperture provided in the camera body is switched, and in the case of panorama size, the upper and lower edges of the aperture provided for full size are covered with a mask plate It is configured as follows.

However, in order to be able to perform this screen switching operation even when shooting after loading a film, the mask plate inside the camera must be moved by an operation from outside the camera. Therefore, in order to carry out this in a light-tight manner, an idea is required here. Accordingly, the applicant of the present application has previously filed Japanese Patent Application Nos.
No. 99817 proposed a camera for changing the size of a photographing screen using a magnet.

[0005]

However, the following problems are encountered in the camera for changing the size of a shooting screen from outside the camera using the magnet proposed by the present applicant. is there. That is, if a shock is applied to the camera, the magnet may be released from the attraction, and a photograph having a size different from the size intended by the photographer may be taken. ◎ In other words, when shooting while switching the screen size to panorama size, if the camera is shocked, the magnet will come off and the screen will return to full size, so the photographer intends to shoot in panorama size Even if it does, it will actually expose a full size screen.

SUMMARY OF THE INVENTION It is an object of the present invention to eliminate the above-mentioned drawbacks in a camera capable of switching a photographing screen size from outside the camera by using a magnet to switch the photographing screen size. An object of the present invention is to provide a camera capable of switching the screen size so that the user can immediately recognize whether the camera is in use.

[0007]

SUMMARY OF THE INVENTION A screen size switchable camera according to the present invention is a screen size switchable camera capable of switching between a normal screen size and a screen size different from the normal screen size. Magnetic coupling means comprising a possible member, and the magnetic coupling means,
A moving means for moving from outside the camera in accordance with the screen size to be switched, and a moving means provided at a position corresponding to the moving range of the magnetic coupling means, which is mechanically non-coupled and communicates with the magnetic coupling means .
Usually, they are coupled by magnetic force, and the relative distance to the magnetic coupling means
Screen size switching means for defining the masking range of the aperture provided in the camera body without changing the separation, and switching the screen size by moving the moving means, and a switching state of the screen size switching means If the screen size switching means is the normal screen size, the display of the normal size screen is displayed, and if the screen size switching means is the screen size different from the normal screen size, the display that the screen size is different from the normal size screen is displayed. And a notifying means for notifying the state of the screen size.

[0008]

When the shock is applied to the camera and the connection between the screen size switching means and the magnetic coupling means is released, the notifying means notifies the user which screen size has been changed. You can know the screen size.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. FIG. 1 is an exploded perspective view of a main part of a camera capable of switching a screen size according to a first embodiment of the present invention.

As shown in the figure, a photographing angle of view of a film 21 (see FIGS. 3 and 4) loaded in the camera is determined at the center of the camera body 1 and behind a photographing lens (not shown). An aperture 1c is provided. Press plate rails 1a and 1b are respectively provided on the upper and lower portions of the back surface of the camera body 1 with the aperture 1c interposed therebetween, and are respectively provided outside the upper and lower edges of the aperture 1c. Film rails 1i and 1j are protruded. The pressure plate rails 1a and 1b are disposed at the center of the inner surface of the rear cover 8 facing the aperture 1c when the rear cover 8 disposed on the rear side of the camera body 1 is opened and closed. The film 21 is pressed by the pressure plate 7, and the film 21 is sandwiched between the film rails 1i and 1j and the pressure plate 7, so that the flatness of the film is ensured and the feeding is guided. . A vertical guide groove 1h is formed in the camera body 1 at a position closer to the film winding chamber 1d than the aperture 1c, and the guide groove 1h is formed of a magnetic material on the upper and lower portions. The mask supports 4 and 5 that move along the wall surfaces 1e and 1f of the guide groove 1h are slidably disposed in the grooves, respectively. At the center of the mask supports 4 and 5, through holes 4a and 5a are provided in the vertical direction, respectively, and both the through holes 4a and 5a are loosely inserted into the guide shaft 6. An extensible coil spring 22 wound around the guide shaft 6 is disposed between the two mask supports 4 and 5, and the two mask supports 4 and 5 are extended by the extension elasticity of the coil spring 22. They are urged away from each other.

On the other hand, on the front side of the aperture 1c, inside the camera body 1, a strip-shaped thin plate extending in the lateral direction of the camera body 1 is formed. Mask members 2 and 3 which are movable and are capable of masking the upper and lower edges of the aperture 1c, and which are screen size switching means, have their one ends 2a and 3a on the back side of the mask supports 4 and 5, respectively. It is fixed and arranged. In the upper and lower portions of the wall surface 1f near the aperture 1c, vertical guide grooves 2c, 3c are respectively formed so as to penetrate the wall surface 1f, and the mask members 2 are inserted through the guide grooves 2c, 3c. , 3 are fixed to the mask supports 4, 5 at one end 2a, 3a. Therefore, the mask members 2 and 3 are vertically moved by the mask supports 4 and 5.

[0012] Of the mask supports 4 and 5, the front side of the upper mask support 4, that is, the side opposite to the side on which the mask member 3 is fixed, enters and exits the finder optical system. A panorama field frame member 23 that displays a field frame at the time of panorama-size shooting is fixed at its base.

The finder optical system comprises, for example, an objective lens 24, a first prism 25, a second prism 26, and an eyepiece 27 as shown in FIG. Immediately before, a full-size field frame member 28 for determining a field frame at the time of full-size shooting is provided, and the panoramic field frame member 2
3 comes in and goes out in conjunction with the switching of the photographing screen size. That is, the panoramic view frame member 23 constitutes a notifying unit for notifying the state of the screen size.

On the other hand, the rear cover 8 is provided so as to be openable and closable so as to cover the back surface of the camera body 1, and is located at a moving path of the mask supports 4, 5, that is, at a position facing the guide groove 1h. Is provided with a longitudinal guide slot 8a. Behind the rear lid 8, a photographing screen size switching operation unit (not shown), for example, a photographing screen size switching member 12 which operates in conjunction with a screen size switching button or the like, feeds a film on the outer surface of the rear lid 8. It is slidably provided in a direction parallel to the direction. In the center of the front surface of the photographing screen size switching member 12, an S-shaped cam slot 13 which rises to one side is provided.
And S which is located below the cam slot 13 and is one side downward.
The cam grooves 14 are formed so as to face each other.

In the cam slots 13 and 14,
The magnets 9 and 10 constituting the magnetic coupling means are movably fitted. That is, the magnets 9 and 10 each have a base portion formed by large-diameter portions 9b and 10b and a distal end portion formed by small-diameter portions 9a and 10a, and the large-diameter portions 9b and 10b are formed by the cam slots 13 and 10b.
The small diameter portions 9a and 10a protrude into the camera body 1 through the guide long holes 8a.
The projecting end surfaces of the small diameter portions 9a and 10a are shown in FIGS.
As shown in FIG.
3, mask supports 4 and 5 made of the above magnetic material
It is disposed at a position where it is magnetically coupled to. Further, the magnetic coupling by the magnetic attraction is normally in a force balance that cannot be deviated by the elasticity of the extensible coil spring 22.

Accordingly, the photographing screen size switching member 1
Reference numeral 2 designates a moving means for moving the mask members 2 and 3 from outside the camera in accordance with the screen size to be switched, and slides the screen size switching member 12 in the direction of arrow N or P shown in FIG. Then, the magnets 9 and 10 move in the guide elongated holes 8a in opposite directions to each other, and the mask supports 4 and 5 magnetically coupled to the magnets 9 and 10 become the same.
It slides up and down in conjunction with 0. As a result, the apertures 1c move while the mask members 2 and 3 move vertically.
The masking of the opening surface is switched.

Next, the operation of the photographing screen size switching camera according to the first embodiment having the above-mentioned configuration will be described with reference to FIGS. These drawings show the mask members 2 and 3 and the photographing screen size switching member 12 and the periphery thereof in the camera. FIGS. 3 and 5 show the full-size (36 mm × 24 mm) photographing. 4 and 6 show panoramic size (36 mm x 13 mm)
Respectively show the states at the time of shooting.

When the film 21 is loaded into the camera body 1, the film 21 is located between the mask members 2, 3 and the pressure plate 7. Then, when photographing in full size, the photographing screen size switching member 12 is slid in the direction of arrow N (see FIG. 1). As a result, the magnets 9 and 10 are pushed to the positions of the one ends 13a and 14a of the cam slots by the cam slots 13 and 14 (see FIG. 1) on the switching member 12. That is, the magnet 9 moves upward and the magnet 10 moves downward. Then, as the magnets 9 and 10 move, the magnets 9 and 1 are moved.
The mask supports 4 and 5, which are magnetically coupled to 0, respectively slide in the vertical direction. Since the mask members 2 and 3 are integrally fixed to the mask supports 4 and 5, the mask members 2 move upward as the mask supports 4 and 5 move.
Further, the mask member 3 moves downward and retreats outside the aperture 1c. Therefore, the film 21 becomes a full-size shooting screen.

When the mask support 4 moves upward, the panoramic field frame member 23 also moves upward, the panoramic field frame portion 23a retracts from the finder field, and the finder becomes a full-size field. This allows full-size shooting.

Next, when photographing in panoramic size, the photographing screen size switching member 12 is slid in the direction of arrow P (see FIG. 1). Then, the switching member 1
The magnets 9 and 10 move toward each other by the upper cam slots 13 and 14 (see FIG. 1), and are narrowed to the positions of the other ends 13b and 14b of the cam slots. That is, the magnet 9 moves downward and the magnet 10 moves upward. As the magnets 9 and 10 move, the mask supports 4 and 5 magnetically coupled to the magnets 9 and 10 slide downward and upward, respectively. At this time, the elasticity of the extensible coil spring 22 is charged. In this way, the mask members 2 and 3 are moved downward by the movement of the mask supports 4 and 5, and the mask member 3 is moved upward by the movement of the mask supports 4 and 5, so that the upper and lower edges of the aperture 1c are moved. To form a panoramic aperture 1c,
As a result, the shooting screen of the film 21 becomes a panoramic size. Further, since the mask support 4 has moved downward, the panoramic visual field frame member 23 has also moved downward, and the panoramic visual field frame portion 23a enters the finder visual field as shown in FIG. Covering the field of view, the viewfinder has a panoramic size field of view. This makes it possible to shoot in panoramic size.

In this state, if a shock or the like is applied to the camera for any reason and the magnetic coupling between the magnets 9 and 10 and the mask supports 4 and 5 is released, at this time, the notification means according to the present invention is used. Works. That is, when the magnetic coupling is released, the photographing screen size switching member 12 remains at the panoramic position, and the mask supports 4 and 5 move the mask member 2 upward by the release elasticity of the coil spring 22 and move the mask member 3 upward.
Move downward and retreat outside the aperture 1c. Therefore, the aperture 1c is a full-size shooting screen. When the mask supports 4 and 5 move, the panoramic field frame member 23 also moves upward and retreats from the finder field, so that the finder has a full-size field.
As described above, when the magnetic coupling by the magnet is lost for some reason and the screen size is changed, the finder field of view is simultaneously switched. Therefore, since the switching position of the photographing screen size switching member 12 does not match the finder field of view, the photographer is aware of this and prevents taking a photograph unintended by the photographer.

In the first embodiment, the mask members 2 and
The camera screen 1 is switched by masking the aperture 1c by moving the camera body 3, but the camera body 1 is divided at a predetermined location, and the divided portions are similar to the mask members 2 and 3. Alternatively, the aperture forming section itself may be moved while taking on a different role. In addition, the first
In the embodiment, switching between the normal standard size and the panorama size has been described by way of example, but the present invention is not limited to this. For example, a standard size and a half size, or a standard size and a shooting screen larger than the standard size Needless to say, the present invention may be applied to a switching mechanism with a size.

FIG. 7 to FIG. 10 show a second embodiment of the present invention. The second embodiment is substantially the same as the first embodiment, except that the panoramic field frame member 23 in the first embodiment is eliminated, as shown in FIGS. Panorama changeover switch 30
Is provided. In the panorama changeover switch 30, a movable contact piece 30a is provided on a moving path of the mask support 4, and is turned on and off by the mask support 4. That is, when the mask support 4 is at the standard size position, as shown in FIG. 7, the switch 30 is turned off by the movable contact piece 30 a being pushed up by the mask support 4 so that the mask support 4 is turned off. When the is moved to the position of the panorama size, as shown in FIG. 8, the changeover switch 30 is turned on because the lifting of the movable contact piece 30a of the mask support 4 is released.

FIGS. 9 and 10 show the viewfinder visual field, respectively. FIG. 9 shows a normal standard size photographing.
FIG. 10 shows the time of panorama-size shooting. The finder field frame 31 is provided with a standard size field frame 31a and a frame line 31b for determining the composition of the panorama size, and is provided on the right side of the field frame 31a by turning on the panorama changeover switch 30. LE for viewfinder
When D emits light, the P mark 32 indicating the panorama size illuminates.

In the second embodiment having the above-described structure, when the photographing screen size switching member 12 (see FIG. 1) is moved in the direction of arrow N when photographing in the standard size, the mask support 4 is moved. The mask support 5 moves upward and the mask members 2 and 3 move downward, respectively.
Since the camera is retracted from the position c, the photographing state becomes the standard size. When the mask support 4 moves upward, the panorama changeover switch 30 is turned off, so that the finder LED (not shown) is turned off, and the P mark 32 is not visible in the finder visual field. Can be confirmed to be in the standard size shooting condition.

Next, in the case of panoramic size photographing, when the photographing screen size switching member 12 (see FIG. 1) is moved in the direction of arrow P, the mask support 4 moves downward and the mask support 5 moves upward. To the mask member 2,
Since 3 enters the aperture 1c, a panorama-size shooting state is set. Further, since the mask support 4 moves downward, the panorama changeover switch 30 is turned on, the finder LED emits light, and the P mark 32 is lit in the finder visual field. Accordingly, this allows the photographer to know that the camera is in a panoramic size photographing state.

In this panoramic size photographing state, a shock or the like is given to the camera for some reason,
It is assumed that the magnetic coupling between the mask support 10 and the mask supports 4 and 5 has been released. Then, at this time, the notification means according to the present invention operates. That is, when the magnetic coupling is released, the photographing screen size switching member 12 remains in the panorama position and the mask supports 4, 5 remain.
Is moved vertically by the release elasticity of the coil spring 22, the mask member 2 moves upward and the mask member 3 moves downward, and retreats outside the aperture 1c. Therefore, the aperture 1c is a standard size photographing screen even though the photographing screen size switching member 12 is at the panoramic position. When the mask support 4 moves upward, the movable contact piece 30a is pushed up and the switch 30 is turned off as shown in FIG.
The ED stops emitting light and the P mark 32 in the viewfinder field
Disappears. As described above, when the magnetic coupling by the magnet is lost for some reason and the screen size is changed, the finder field of view is simultaneously switched. Therefore, since the switching position of the photographing screen size switching member 12 does not match the finder field of view, the photographer is aware of this and prevents taking a photograph unintended by the photographer.

In the second embodiment, the finder L
The P mark 32 is turned on in the finder field of view using the ED. Instead, a PCV (piezo ceramic vibrator) is built in the camera, and when the panorama switch 30 is turned on, the PCV emits sound. Even if it occurs, the same operation and effect as in the second embodiment can be obtained.

[0029]

According to the present invention, in a photographing screen size switching camera in which the size of the photographing screen is switched from outside the camera by using a magnet, the magnet is disengaged by a shock or the like and the screen mask size is switched. However, in the present invention, this is announced, so that the photographer does not need to be aware of this and do not have to take a picture with an unintended screen size.

[Brief description of the drawings]

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

FIG. 2 is an enlarged perspective view of a finder optical system of the camera.

FIG. 3 is an enlarged sectional view of a main part of the camera of the first embodiment, showing a state in which a photographing screen is switched to a full size.

FIG. 4 is an enlarged sectional view of a main part of the camera according to the first embodiment, showing a state in which a shooting screen is switched to a panoramic size.

FIG. 5 is a main part rear view showing a state in which a shooting screen is switched to a full size in the camera of the first embodiment.

FIG. 6 is a main part rear view showing a state in which a photographing screen is switched to a panorama size in the camera of the first embodiment.

FIG. 7 is an enlarged sectional view of an essential part showing a state in which a photographing screen is switched to a full size in a camera capable of switching a screen size according to a second embodiment of the present invention.

FIG. 8 is an enlarged cross-sectional view of a main part showing a state in which a photographing screen in a camera capable of switching a screen size according to a second embodiment of the present invention is switched to a panoramic size.

FIG. 9 is a front view showing a finder visual field in the camera of the second embodiment.

FIG. 10 is a front view showing a finder visual field in the camera of the second embodiment.

[Explanation of symbols]

2, 3 ... mask member (screen size switching means) 4, 5 ... mask support (magnetic coupling means, screen size switching means) 9, 10 ... magnet (magnetic coupling means) 12 ... photographing Screen size switching member (moving means) 13, 14 ... cam slot (moving means) 22 ... extensible coil spring (notifying means) 23 ... panoramic field frame member (notifying means) 28 ... ……… Full-size field frame member (notification means) 32 ……… P mark (notification means)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 3-84825 (JP, U) JP-A 64-157726 (JP, U) JP-A 60-184041 (JP, U) (58) Survey Field (Int.Cl. ⁷ , DB name) G03B 17/28

Claims (1)

(57) [Claims] 1. A screen size switchable camera capable of switching between a normal screen size and a screen size different from the normal screen size, comprising: a magnetic coupling means comprising a magnetic material or a member which can be magnetically coupled; a switch moving means for moving from the outside of the camera corresponding to the screen size, provided at a position corresponding to the moving range of the magnetic coupling means, is mechanically the same magnetic coupling means and a normal magnetic force unbound Coupled, without changing the relative distance to the magnetic coupling means
A screen size switching means for defining a masking range of an aperture provided in the camera body and switching the screen size by moving the moving means; and a screen size switching means according to a switching state of the screen size switching means. If the screen size is the normal screen size, the normal size screen is displayed, and if the screen size switching means is a screen size different from the normal screen size, the fact that the screen size is different from the normal size screen is displayed. A screen size switchable camera, comprising: a notifying unit for notifying the user.