JPH06273830A - Light shielding structure for camera - Google Patents

Abstract

PURPOSE:To provide a light shielding structure for unwanted light from a photographic lens to a scroll room, in a compact camera. CONSTITUTION:A space 13 surrounded by the outer peripheral part of a roll film F loaded in the scroll room 41a of a camera, the inside wall 41b of the scroll room 41a of a photographic picture frame side and the wall surface of the rear cover 11 of a scroll room side is provided and a projecting part 11a is provided on the side of the space 13 from a curved surface holding a film plane and on the outside of a film picture from the rear cover 11 so that the scroll room 41a is shielded from light outgoing from the photographic lens 42. Thus, in the light shielding structure for the camera, the camera can be made compact.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light-shielding structure of a camera, and more particularly to a technique of a light-shielding structure of a camera which is small in size and can shield unnecessary light from a photographing lens to a scroll chamber.

[0002]

2. Description of the Related Art Conventionally, a film camera with a lens is used to store a roll of film in a scroll chamber, a patrone chamber is provided on the side opposite to a photographing screen frame, and a film is sequentially wound around an empty patrone each time a photograph is taken. There are some types of cameras.

An example of the camera is shown in FIG. The camera base 701 has a photographing lens 702, and the scroll chamber 703 can store the film F. The film feed path 708 is extended from the scroll chamber 703 to the patrone chamber 707.
There is. Further, the film feeding path 708 has a curved shape in order to eliminate the aberration of the lens as shown in the figure. On the other hand, there is a rear cover 705 on the rear surface of the camera base body 701, which keeps the flat surface of the film F.

[0004]

The conventional light-shielding structure for the scroll chamber of the camera has the following problems. When strong light L enters near the shooting screen frame 706 on the scroll room 703 side through the shooting lens, it is reflected by the film F as shown in FIG. 5, and the reflected light is directly or indirectly reflected on the back surface of the roll-shaped film F. In some cases, light may enter the vicinity of the frame of the shooting screen to cause film fog.

Further, in order to prevent the above-mentioned film fogging, there has been one in which the length of the scroll chamber and the optical axis of the photographing lens is increased.

The present invention has been made to solve the above problems, and an object thereof is to provide a structure for shielding unnecessary light from a photographing lens to a scroll chamber with a small camera.

[0007]

Such an object is achieved by the present invention described below. That is, (1) a film plane is held in a space surrounded by an outer peripheral portion of a roll-shaped film mounted in a scroll chamber of a camera, a scroll chamber inner wall on a shooting screen frame side and a wall surface of a rear cover on the scroll chamber side. A light-shielding structure for a camera, characterized in that a convex portion is provided on the rear cover from the curved surface to the space side to block light emitted from the photographing lens from entering the scroll chamber,
(2) In the light-shielding structure for a camera according to item 1, the light-shielding structure for the camera is such that the film surface is pressed by the rail surface inside the film at the scroll side end.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a rear perspective view of a camera to which the present invention is applied, FIG. 2 is a sectional view taken along the optical axis AA of FIG. 1, and FIG. 4 is an exploded perspective view of the rear surface of the camera.

The camera of the embodiment is a film camera with a lens, and the film F is wound and stored in a scroll chamber as shown in the figure. A patrone chamber is provided on the side opposite to the photographing screen frame, and an empty patrone is used for each photographing. It is a camera that takes up film in sequence.

Explaining the structure of the camera 40, the camera base 41 includes a taking lens 42, a taking lens 42 and a taking screen frame.
An aperture stop 21 is provided between the aperture stop 41 and 41c. The housing part 43 is a space between the aperture stop 21 and the photographing screen frame 41c. The film F can be stored in the scroll chamber 41a, and the scroll chamber inner side wall 41b is formed in an arc shape. There is a cartridge room 45 on the side opposite to the photographing screen frame 41c so that the cartridge P can be stored. Further, there is a film feeding path 51 for the film P from the scroll chamber 41a to the cartridge chamber 45, and the vertical position of the film F is defined above and below the film feeding path 51 on the camera base 41 side.
There is a pair of outer rails 52. Further, there are two sets of inner rails 53 that regulate the position of the film F surface on the side of the photographing lens on the side of the camera base 41 of the film feeding path 51, and the inner rail surface ends at the end of the inner rail 53 on the spool chamber side. There is a part 53a, and the film F
Is pressed to the rear cover side. Figure wall of film feed path
Reference numeral 51a is lower than the film sliding surface of the inner rail 53 so that the film photographing surface does not come into contact with the camera base body 41 to cause film scratches.

The film feed path 51 has a curved shape in order to eliminate aberration of the lens as shown in the figure. On the other hand, the front surface of the camera base 41 has the front cover 12, and the rear surface thereof has the rear cover 11.
There is each.

The rear cover 11 has a rear cover curved surface 11b for holding the flat surface of the film F. In addition, the space surrounded by the outer peripheral portion of the film F, the scroll chamber inner side wall 41b, and the rear cover 11.
There is a rear cover convex portion 11a on the rear cover 11, and the rear cover convex portion 11a acts on the perforation portion outside the photographing screen of the film F to bend the film.
Moreover, even if a scratch occurs, the shooting screen is not affected.

Next, description will be made regarding the blocking of the light that enters from the photographing lens 42 and enters the scroll chamber 41a. For example, the direct light L of the sun is radiated through the photographing lens 42 to the end of the photographing screen frame 41c on the scroll chamber side. Suppose However, since the rear cover convex portion 11a is provided, the film F is curved following the convex portion, and the inner rail surface end portion 53a further pushes the film F toward the film feed path wall surface 51a side to thereby form the film feed path wall surface.
Since the gap between the film 51a and the film F acts so as to be small, unnecessary light is prevented from entering the scroll chamber side. In addition, the curvature of the film F is set to the corner portion 41 of the camera base.
The gap formed with d is curved, and it is difficult for light to enter the scroll chamber. Since there is an unexposed area of about 1.5 to 2 mm on a 35 mm film between a shooting screen and the next shooting screen, even if there is a fog, a small amount will not affect the shooting screen.

In the embodiment, the rear cover protrusion 11a is formed on the film P.
Although it is provided at two places in the perforation part of the above, the projection screen portion of the film P may be provided at several places. In addition, the rear cover convex portion 11a is provided in the scroll chamber 41 from the side edge of the photographing screen frame.
It may be in any suitable position on a.

[0015]

Since the present invention is constructed as described above, the following effects can be obtained.

Providing a convex portion of the rear cover in the scroll chamber,
Since it is possible to prevent light that leaves the subject, passes through the shooting lens, and reaches the vicinity of the shooting screen frame on the scroll room side from being reflected on the film surface and entering the scroll room, the distance between the scroll room and the shooting lens optical axis can be shortened, The light-shielding structure allows the camera to be downsized.

Further, since the end of the inner rail surface works so as to reduce the distance between the film feed path wall surface and the film, unnecessary light can be prevented from entering the scroll chamber side, and the camera can be miniaturized. It becomes a structure.

[Brief description of drawings]

FIG. 1 is a rear perspective view of a camera to which the present invention has been applied.

2 is an embodiment of the present invention showing a sectional view taken along the line AA of FIG.

3 is an embodiment of the present invention showing a sectional view taken along the line BB of FIG.

FIG. 4 is an exploded perspective view of the rear surface of the camera according to the embodiment of the present invention.

FIG. 5 is an optical axis cross-sectional view of a light shielding structure of a conventional camera.

[Explanation of symbols]

 11 Rear cover 11a Rear cover convex portion 11b Rear cover curved surface 13 Space 41 Camera base 41a Scroll chamber 41b Scroll chamber inner wall 41c Photo screen frame 42 Photo lens 51 Film feed path 51a Film feed path wall surface 52 Outer rail 53 Inner rail 53a Inner rail surface end F film P Patrone L ray

Claims (2)

[Claims] 1. A film plane is held in a space surrounded by an outer peripheral portion of a roll-shaped film mounted in a scroll chamber of a camera, a side wall of a scroll chamber on the side of a photographing screen and a wall surface of a rear cover on the side of the scroll chamber. A light-shielding structure for a camera, characterized in that a convex portion is provided on the rear cover toward the space side from a curved surface to block light emitted from a photographing lens from entering a scroll chamber. 2. The light-shielding structure for a camera according to claim 1, wherein
A light-shielding structure for the camera that presses the film surface with the rail surface inside the film at the scroll side edge.