JP2001083594A - Camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an image frame switching mechanism from interfering with a cam plate by arranging a driving mechanism for driving a light shielding member and a bottom board for holding the driving mechanism on the external wall of a cartridge or a reel chamber and in the vicinity of the external wall positioned on an image frame side nearly orthogonally to a film surface. SOLUTION: The driving mechanism constituted of a rack and a pinion and a bottom board 21 are arranged on the external wall 1b of the cartridge chamber of a camera main body 1 and in the vicinity of the external wall 1b of the cartridge chamber 1b on the image frame 1a side nearly orthogonally to the film surface. Two attaching parts 21a are provided on the board 21 to which individual members are attached in the image frame switching unit 2. Then, the attaching part 21a is made to abut on an attaching boss 1d provided on the external wall 1b of the cartridge chamber of the camera main body 1 and a tapping small screw 3 pierces through the hole 21b of the attaching part 21a and is screwed into the hole 1e of the boss 1d. Thus, the light shielding parts 22a and 23a provided to the unit 2 slide proximately to the image frame 1a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera provided with image frame switching means for shading a part of an image frame forming a photographic screen by an external operation and forming a different photographic screen on a film.

[0002]

2. Description of the Related Art There are known a large number of cameras capable of forming a panoramic photographic screen on a film by shielding the upper and lower ends of an image frame forming a photographic screen by an external operation.

Conventionally, such a mechanism for switching to a panoramic image frame has been disposed on a side wall of a front base plate for holding a lens barrel for a photographing lens. If the taking lens is a zoom lens, it has a zoom finder that changes the magnification in conjunction with zooming, and a cam that moves the zoom lens of the zoom finder in conjunction with the operation of the lens barrel for the taking lens. The provided cam plate was mounted on the front base plate.

[0004]

However, the longer the focal length of the photographing lens on the long focal length side, the larger the amount of movement of the zoom lens of the zoom finder, and therefore the larger the cam plate. Therefore, since the image frame switching mechanism interferes with the cam plate, it is difficult to arrange the image frame switching mechanism on the front ground plate.

For this reason, it is desirable to dispose the image frame switching mechanism on a portion other than the front ground plate. The thickness increases in the optical axis direction due to the base plate holding the mechanism, which hinders miniaturization of the camera.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to propose a camera in which an image frame switching mechanism is arranged so as not to interfere with a cam plate and not to hinder miniaturization of the camera. It is assumed that.

[0007]

The above object is achieved by the following means.

A camera body in which a patrone chamber for accommodating a patrone and a reel chamber for winding the film around a reel are arranged on both sides of an image frame for forming a photographing screen on the film;
In a camera provided with image frame switching means for shielding a part of the image frame with a light shielding member by an external operation and forming a different photographing screen on a film, a driving mechanism for driving the light shielding member and the driving mechanism are held. A camera, wherein a main plate is arranged on an outer wall of the patrone room or the reel room and near an outer wall positioned on the image frame side substantially orthogonal to a film surface.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a camera according to the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing a state in which an image frame switching unit is mounted on a camera body, and FIG. 2 is a perspective view of the image frame switching unit.

In FIG. 1, reference numeral 1 denotes a camera body, and 2 denotes an image frame switching unit. Image frame 1a is located at the center of camera body 1.
The subject light that has passed through a photographic lens, aperture, and shutter (not shown) exposes a film disposed on the back surface of the image frame 1a. A patrone room for storing a patrone is disposed on the left side of the image frame 1a, and 1b is an outer wall of the patrone room. A reel chamber for winding a film on a reel is disposed on the right side of the image frame 1a, and 1c is an outer wall of the reel chamber.

The base plate 21 for mounting each member in the image frame switching unit 2 has two mounting portions 21a.
Then, the mounting portion 21a is brought into contact with the mounting boss 1d provided on the patrone room outer wall 1b of the camera body 1, and the small tapping screw 3 is passed through the hole 21b of the mounting portion 21a and screwed into the hole 1e of the mounting boss 1d. . By attaching the image frame switching unit 2 to the camera body 1 in this manner, the light shielding portions 22a and the light shielding portions 23 provided in the image frame switching unit 2 are provided.
a slides close to the image frame 1a.

Here, when the film to be used is 135 film, the long side 36 is added to the film by the image frame 1a.
A standard size photographing screen having a short side of 24 mm is formed. When the operation interlocking portion 22b is pulled up by operating an operation member (not shown), the light shielding portion 22a and the light shielding portion 23a approach each other from above and below to shield the upper and lower ends of the image frame 1a. As a result, the film has a long side of 36 mm and a short side of 1 mm.
A shooting screen of 3 mm is formed. This shooting screen is called a panorama size.

Next, the configuration of the image frame switching unit 2 will be described with reference to FIG. FIG. 2 is a perspective view of the image frame switching unit 2 shown in FIG.

Referring to FIG. 2, the light shielding portion 22 shown in FIG.
a, the operation interlocking part 22b is a part of the first light shielding member 22, and the light shielding part 23a is a part of the second light shielding member 23. The pin 24 penetrates the long hole 22c of the first light shielding member 22 and is inserted into the ground plate 21, and the first light shielding member 22 is configured to be slidable up and down. Further, the pin 25 is connected to the second light shielding member 2.
The third light-blocking member 23 is also slidable up and down through the three long holes 23c. Further, the first light shielding member 22 and the second light shielding member 23 have racks 22d and 23d facing each other.
It is arranged between 2d and 23d, and meshes with a pinion 26 that is rotatably supported by the main plate 21.

Here, when the operation interlocking portion 22b of the first light shielding member 22 is pulled up by the external operation member, the first light shielding portion 22a also moves upward. At this time, since the rack 22d also moves upward, the pinion 26 rotates counterclockwise to move the rack 23d downward. Accordingly, the second light shielding member 23 slides downward, and the second light shielding portion 23a also moves downward. Therefore, a panoramic size photographing screen is formed as described above.

Next, the operation interlocking unit 2 is operated by an external operation member.
When 2b is lowered, the first light shielding portion 22a also moves downward. At this time, since the rack 22d also moves downward, the pinion 26 rotates clockwise to move the rack 23d upward. Therefore, the second light shielding member 23 slides upward, and the second light shielding portion 23a also moves upward. As a result, the first light-shielding portion 22a is retracted below the image frame 1a, and the second light-shielding portion 23a is retracted above the image frame 1a, so that a standard-size shooting screen is formed.

In some cases, the first light shielding portion 22a
The operation interlocking portion 22b and the rack 22d may be formed separately from the rack 22d, and the first light shielding portion 23a may be formed separately from the rack 23d.

In the image frame switching unit 2 having the above-described configuration, the drive mechanism including the racks 22d and 23d and the pinion 26 and the main plate 21 are the outer wall 1b of the patrone room of the camera body 1 and are substantially perpendicular to the film surface. , Picture frame 1a
Is disposed near the outer patrone room outer wall 1b. Therefore, the driving mechanism does not interfere with the cam plate as in the related art.

As shown in FIG. 1, a mounting boss 1d for screwing the image frame switching unit 2 to the camera body 1 is provided with an arc portion of the patrone chamber outer wall 1b located on the image frame 1a side, that is, other mechanical members. Since it is located in a dead space where it is difficult to place it, efficient space utilization can be achieved, contributing to downsizing of the camera.

The base plate 2 in the image frame switching unit 2
1 and the place where the drive mechanism is disposed are not limited to the patrone room outer wall 1b, but the reel room outer wall 1c.
Further, it may be a portion that is substantially orthogonal to the film surface and located on the image frame 1a side.

Further, the image frame switching unit does not have to be a mechanism constituted by the rack and pinion as described above. For example, two driving members sliding up and down are connected by a lever,
A configuration in which a fulcrum is provided at the center of the lever and the levers slide in opposite directions may be used.

Finally, the correspondence between the terms used in the claims and the terms used in the embodiments will be described.

The light blocking member corresponds to the light blocking portions 22a and 23a.

The image frame switching means corresponds to the image frame switching unit 2.

The mounting portion corresponds to the mounting boss 1d.

[0026]

According to the camera of the first, third and fourth aspects, the image frame switching means does not interfere with the cam plate or the like.

According to the second aspect of the present invention, the image frame switching means can be mounted on the camera body using the dead space of the camera body.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state where an image frame switching unit is mounted on a camera body.

FIG. 2 is a perspective view of an image frame switching unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Camera main body 1a Image frame 1b Patrone room outer wall 1d Mounting boss 2 Image frame switching unit 21 Main plate 22 First light shielding member 22a, 23a Light shielding portion 22d, 23d Rack 23 Second light shielding member 26 Pinion 3 Tapping small screw

Claims (4)

[Claims] 1. A camera body in which a patrone chamber for accommodating a patrone and a reel chamber for winding a film around a reel are arranged on both sides of an image frame for forming a photographing screen on a film. A light-shielding member, and a frame switching means for forming a different photographing screen on a film, wherein a driving mechanism for driving the light-shielding member and a base plate for holding the driving mechanism are provided in the cartridge chamber or the cartridge. A camera which is disposed on an outer wall of a reel chamber and near an outer wall positioned on the image frame side substantially orthogonal to a film surface. 2. A mounting portion is provided in an arc portion of an outer wall located on the image frame side of the patrone chamber or the reel chamber,
2. The camera according to claim 1, wherein the image frame switching unit is mounted on the mounting unit. 3. A panoramic photographing screen is formed by shielding the upper and lower ends of the image frame with the light shielding member, wherein the light shielding member comprises two members that slide on upper and lower ends of the image frame. The camera according to claim 1 or 2, wherein: 4. The drive mechanism includes two racks formed integrally with the two light blocking members and facing each other, and a pinion meshing with the two racks. The camera according to claim 1.