JP2001133937A - Film unit with lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film unit with a lens which prevents obliquely penetrating external light from penetrating into a part, where penetration of external light is not allowed, through a gap of faces, where a front cover and a rear cover and brought into contact with a unit main body, to cause a photographic fog on a film by a simple constitution. SOLUTION: The film unit with a lens is provided with at least the unit main body which holds the film, the front cover which covers the unit main body from the front, the rear cover which covers the unit main body from the rear, and the front cover is provided with a first face part having a first step part in the front end, and the rear cover is provided with a second face part having a second step part in the front end, and the first step part and the second step part are fitted into each other and are brought into contact with each other, and the first face part and the second face part are brought into contact with the front face of a rack part provided in the unit main body, and a projection part projected from the front cover or the rear cover is brought into contact with the rear face of the rack part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention prevents fogging of a film due to external light obliquely incident from a contact portion where an end of a front cover and an end of a rear cover contact each other. The present invention relates to a film unit with a lens.

[0002]

2. Description of the Related Art The prior art of a film unit with a lens which is the basis of the present invention will be described with reference to FIGS.

FIG. 1 is a perspective view of a bottom of a film unit with a lens, FIG. 2 is an exploded perspective view of a unit body, a front cover and a rear cover, and FIG. 3 is a sectional view of a main part.
FIG. 3A is a cross-sectional view taken along the line AA in FIG. 1, and FIG.
FIG.

In each of the drawings, reference numeral 1 denotes a unit body for holding a film and various photographing mechanisms, not shown, 2 a front cover for covering the unit body 1 from the front, and 3 a rear cover for covering the unit body 1 from the back. It is.

The front cover 2 and the rear cover 3 are locked to each other by a plurality of locking claws. For example, a locking claw 3a provided on the rear cover 3 is inserted into a locking hole 2a provided on the front cover 2 and separated from each other. It is locked so that it does not.

A cartridge chamber 1a for accommodating a cartridge is provided at an end of the unit body 1, and is sealed by a cartridge lid 4 from the bottom. Since the film that has been taken is wound up into the patrone, the patrone room 1a
It is necessary to surely prevent external light from being incident on the device.

[0007] The rear cover 3 side of the patrone chamber 1a is opened for the structural reason of die cutting when the unit main body 1 is molded, and this is covered with the rear cover 3. Further, a rib is provided around the entrance of the patrone cover 4, and when the patrone cover 4 is sealed as shown in FIG. Preventing. The ribs 1b provided on the unit body 1 and the ribs 2 provided on the front cover 2 are used to reduce the size of the film unit with a lens.
b and a rib 3b provided on the rear cover 3 are formed in contact with each other.

[0008] Here, the ribs 2b of the front cover 2 and the ribs 3b of the rear cover 3, and the ends 2c and 3c of the outer surfaces of the front cover 2 and the rear cover 3 are in contact. However, it is difficult for the front cover 2 and the rear cover 3 to be completely in close contact with each other due to deformation and floating. For this purpose, the front cover 2
Is provided with a wide surface portion 2d including the lower surface of the end of the rib 2b in contact with the rib 3b, and a step portion 2 is provided at the tip of the surface portion 2d.
e, and a rib 3b that contacts the rib 2b on the rear cover 3.
A wide surface portion 3d including the lower surface of the end portion is provided, and a step portion 3e is provided at the tip of the surface portion 3d, and as shown in FIG. Therefore, even if light leaks from the gap between the contact portions 5 where the ends 2c and 3c of the outer surfaces of the front cover 2 and the rear cover 3 come into contact, the light is blocked by the steps 2e and 3e.

A battery compartment 1c is disposed at the center of the bottom of the film unit with a lens, and a battery cover 3f covering the battery compartment 1c is formed integrally with the rear cover 3. When the battery cover 3f is opened, the battery cover 3f is turned around the hinge 3g. For this purpose, the end 3h of the battery lid 3f and the front cover 2
There is a possibility that a gap may be formed between the end portion 2h and the outside light and may enter the inside. However, in the actual product, there is no light leakage because the label covering this gap is attached, and even if there is light leakage, there is no problem because the battery chamber is unrelated to the film.

[0010]

In the film unit with a lens having the above-described structure, light leakage is completely prevented as a product, but it has been found that a problem of light leakage slightly occurs in a manufacturing process.

That is, when a film is loaded in the patrone chamber 1a, but no label is attached, outside light obliquely penetrates from the gap between the end 3h of the battery cover 3f and the end 2h of the front cover 2. Penetrates into the lower portions of the surface portions 2d and 3d. A rib 1d for the battery chamber 1c is provided upright on the unit main body 1, but it is partial and does not serve for light shielding. The surface portions 2d and 3d have a certain length in the direction of the contact portion 5 and are formed so as to contact the surface of the shelf 1e provided on the unit body 1, but actually the front cover is formed. 2 and the rear cover 3 may float upward in FIG. 3A, so that the surface portions 2d and 3d and the shelf portion 1e
And a gap is created between them. Therefore, external light that has entered obliquely from the gap between the end 3h and the end 2h is transmitted to the surfaces 2d, 3d and the shelf 1a.
It has been found that they pass through the gap with the surface of e and enter the patrone chamber 1a.

For this reason, in the manufacturing process of the film unit with the lens, after loading the film, it was not possible to work in a bright room until a label was attached.

The present invention has been made in view of such a problem, and an object of the present invention is to propose a lens-equipped film unit that shields external light that enters obliquely by a simple modification as described above. In addition, in the prior art described above, the outside light enters into the patrone chamber, but is not limited thereto. For example, a roll film chamber in which an unexposed film is wound in advance in a manufacturing process may be used. .

[0014]

The above object is achieved by the following means.

A unit body for holding at least the film, a front cover for covering the unit body from the front,
A rear cover that covers the unit body from the rear, a first surface having a first step at the tip is provided on the front cover, and a second surface having a second step at the tip is provided. A shelf provided on a rear cover, wherein the first step and the second step are staggered and abutted against each other, and the first surface and the second surface are provided on the unit body. A film unit with a lens, wherein a projecting portion protruding from the front cover or the rear cover is brought into contact with the back surface of the shelf unit in the film unit with a lens contacting the surface of the unit.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a film unit with a lens according to the present invention will be described with reference to FIG. FIG. 4 is a view corresponding to FIG. 3, and the same members are denoted by the same reference numerals.

The unit body 1 and the rear cover 3 are the same as those shown in FIGS. However, the front cover 12
Only a part is different from the front cover 2 described above. That is, it has a protruding portion 12j protruding from below the surface portion 12d. The protrusion 12j is in contact with the back surface 1f of the shelf 1e of the unit body 1. For this reason, the front cover 12 does not float upward, the surface portion 12d is in contact with the surface 1g of the shelf 1e of the unit body 1, and this gap is almost zero.

The step 3e is pressed by the step 12e, and the surface 3d of the rear cover 3 is pressed against the surface of the shelf 1e. Therefore, the gap between the surface 3d and the surface of the shelf 1e is almost zero.

As a result, external light obliquely incident from the contact portion between the outer surfaces of the front cover 12 and the rear cover 3 passes through the battery compartment 1c, and passes through the gap between the surface 12d of the front cover 12 and the surface of the shelf 1e. Alternatively, the intrusion into the patrone chamber 1a through the gap between the surface 3d of the rear cover 3 and the surface of the shelf 1e is eliminated.

Although the configuration is slightly different, the protruding portion may protrude from the rear cover. In this case, it is desirable that the step of the rear cover is higher than the step of the front cover.

The surface portion 12d of the front cover 12 and the surface portion 3d of the rear cover 3 do not necessarily need to be located inside as shown in FIG. 4, and both surface portions correspond to the portions where the front cover and the rear cover are located on the outer surface. It may be a surface directly on the back side, or a configuration in which the shelf of the unit body contacts the back surface.

Further, the destination of the external light is not limited to the patrone chamber, but may be, for example, a roll film chamber in which an unexposed film is wound in advance in the manufacturing process.

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

The first step in the claims corresponds to the step 12e in the embodiment, and the first surface corresponds to the surface 12d.

The second step in the claims corresponds to the step 3e in the embodiment, and the second surface is the surface 3
d.

[0026]

According to the film unit with the lens according to any one of claims 1 to 7, external light obliquely entering from a portion where external light is allowed to enter is formed by the front cover and the rear cover. With a simple configuration, it is possible to prevent the film from fogging by passing through the gap between the contacting surfaces and into a portion where external light is not allowed to enter.

[Brief description of the drawings]

FIG. 1 is a perspective view of a bottom portion of a conventional film unit with a lens.

FIG. 2 is an exploded perspective view of a conventional unit body, a front cover, and a rear cover.

3A and 3B are cross-sectional views of main parts of a conventional film unit with a lens. FIG. 3A is a cross-sectional view taken along line AA of FIG. 1, and FIG. 3B is a cross-sectional view taken along line BB of FIG. It is sectional drawing.

FIG. 4 is a sectional view of a main part of the film unit with a lens according to the embodiment, and is a sectional view corresponding to FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Unit main body 1a Patrone room 1b, 2b, 3b Rib 1e Shelf part 2, 12 Front cover 2d, 3d, 12d Surface part 2e, 3e, 12e Step part 3 Rear cover 4 Patrone cover 12j Projecting part

Claims (7)

[Claims] 1. A unit having at least a unit main body for holding a film, a front cover for covering the unit main body from the front, and a rear cover for covering the unit main body from the rear, and having a first stepped portion at a tip. A first surface portion is provided on the front cover, and a second surface portion having a second step portion at the tip is provided on the rear cover, and the first step portion and the second step portion are provided.
And the first and second steps are staggered and abutted against each other, and the first
In the film unit with the lens in which the surface portion and the second surface portion are brought into contact with the surface of the shelf provided in the unit main body, a projecting portion projecting from the front cover or the rear cover is provided on the back surface of the shelf. A film unit with a lens that is brought into contact. 2. The contact portion on one side of the first step portion and the second step portion in a direction along a contact portion where the outer surfaces of the front cover and the rear cover contact. External light can enter through the gap between the contact portions, and external light cannot enter through the gap between the contact portions on the other side of the first step portion and the second step portion. The film unit with a lens according to claim 1. 3. The lens-equipped film unit according to claim 2, wherein a battery chamber is disposed on one side of the first step portion and the second step portion. 4. The lens-equipped film according to claim 2, wherein a patrone chamber for accommodating a patrone is arranged on the other side of the first step portion and the second step portion. unit. 5. A roll film chamber for winding an unexposed film in advance on the other side of the first step portion and the second step portion. The film unit with the lens described. 6. When the protrusion is provided on the front cover, the first step presses the second step, and the second step presses the second step.
The film unit with a lens according to any one of claims 1 to 5, wherein a surface portion of the film unit is pressure-bonded to a surface of the shelf portion. 7. When the projection is provided on the rear cover, the first step is pressed by the second step, and the first step is pressed.
The film unit with a lens according to any one of claims 1 to 5, wherein a surface portion of the film unit is pressure-bonded to a surface of the shelf portion.