JPH0720565A - Camera - Google Patents

Abstract

PURPOSE:To provide a camera capable of making it low in cost and small in size by enabling the camera main body to be formed without forming an undercut. CONSTITUTION:In the camera provided with a film take-up spool room 1A, a part of a wall surface on the peripheral side of the spool room 1A to be undercut is formed of a wall member 5 made of an elastic board having an inside diameter which is different from the inside diameter of the spool room, and the camera main body 1 is provided with an opening part 1d, a wall surface 1a forming the remaining part of the spool room, a recessed part 1f as an attachment part for the wall member 5 and a curvature control part 1h for controlling the curved surface of the wall member 5 so as to be nearly equal to the inside diameter of the spool room 1A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera, and more particularly to a structure of a spool chamber for winding a film.

[0002]

2. Description of the Related Art Generally, a camera body applied to a camera is often manufactured by molding a metal or a resin. The cross-sectional shape of the conventional camera body is shown in FIG. 13. The spool chamber for film winding of the present camera has a spool chamber wall 50 of the camera body 50.
a and a spool chamber wall member 51 which is a separate member. As shown in FIG. 13, a cartridge chamber 50b is provided at a position facing the spool chamber of the main body 50, and a lens / shutter unit is provided at the center.

If the camera body 50 is molded in the optical axis O direction at the time of molding, an undercut portion U is formed in the spool wall portion 50a forming the spool chamber, resulting in a mold structure. It became complicated and was extremely disadvantageous in production. However, unless the spool chamber is provided with the undercut portion U, the spool chamber is located outside the main body, which hinders downsizing of the camera.

In view of this, the structures proposed for the camera body of the single-lens reflex cameras in Japanese Utility Model Laid-Open No. 4-16440 and Japanese Utility Model Laid-Open No. 4-16441 use a separate member for the undercut portion generated in the spool chamber. It is designed to be configured. FIG. 14 shows the above-mentioned conventional actual open flat 4-164.
It is sectional drawing of the camera main-body part periphery proposed by the No. 40 publication. In this camera, the camera body 61 is provided with a wall portion 61a of the spool chamber, a cartridge chamber 61b, and an aperture portion 61c in the central portion. A focal plane shutter unit 63 is arranged along the aperture portion 61c, and the mirror box side wall 6 is provided in front of the focal plane shutter unit 63.
4, 65 are provided. The spool chamber wall member 6 is a separate member in the undercut portion U of the spool chamber of the main body 61.
2 is fixed. Therefore, the main body 61 of the conventional example can be molded without the undercut portion.

Further, FIG. 15 shows the above-mentioned conventional actual flat blade 4-1.
FIG. 6 is a cross-sectional view around a camera body portion proposed in Japanese Patent No. 6441. The main body 61 of the camera, the shutter unit 63,
The mirror box side wall 64 has the same structure as that shown in FIG. Further, in the conventional example, the spool chamber wall portion 7 disposed in the undercut portion U of the spool chamber
4a is formed integrally with the side wall 74 of the mirror box.

[0006]

However, the above-mentioned Japanese Utility Model Application Laid-Open No. 4-16440 and Japanese Utility Model Application Laid-Open No. 4-1644.
The structure of the camera body of the single-lens reflex camera disclosed in Japanese Patent Publication No. 1 is such that the camera body 6 is provided in the undercut portion U of the spool chamber.
It is necessary to dispose the spool chamber wall member 62 or 74a, which is a molding member different from that of No. 1, from the viewpoint of cost.
There are inevitable disadvantages.

The present invention has been made in order to solve the above-mentioned problems, and provides a camera which does not need to be provided with an undercut portion in a spool chamber of a camera body and which can be reduced in cost and downsized. The purpose is to do.

[0008]

A camera of the present invention is a camera having a spool chamber for winding a film,
The wall surface forming a part of the peripheral surface of the spool chamber is formed of an elastic plate having an inner diameter different from the inner diameter of the spool chamber, and the camera body has a wall surface forming the remaining portion of the spool chamber, Mounting of the elastic plate and holding means for restricting the curved surface of the elastic plate so as to substantially match the inner diameter of the spool chamber are provided.

[0009]

A part of the peripheral surface of the spool chamber is formed by an elastic plate having an inner diameter different from the inner diameter of the spool chamber.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing details of a cartridge chamber of a camera showing a first embodiment of the present invention. FIG. 2 is a view showing a cross section of the camera body of the camera of the above-described embodiment and the arrangement state of each member around the body. The focal plane shutter 2 is provided in front of the aperture 1c of the camera body 1.
A mirror unit 3, a lens unit 4, etc. are arranged. In the following description, all the optical axes of the photographing lens are indicated by the symbol O.

The main body 1 of the camera of this embodiment is a member manufactured by die molding, and the die cutting direction is assumed to coincide with the optical axis O. As shown in FIG. 2, the cartridge chamber 1b is provided on one side, and a part of the inner wall portion 1a of the spool chamber 1A is provided on the opposite side. The radius of curvature of the inner diameter of the spool inner wall portion 1a is R1. The portion corresponding to the wall portion near the mirror unit 3 of the spool chamber 1A, which is an undercut portion in the die cutting, is formed as an opening portion 1d without an undercut. 3 shows the spool chamber 1A of the main body.
FIG. A spool gear fitting hole 1e is provided on the bottom surface of the spool chamber 1A.

As shown in FIG. 1, a recess 1f capable of press-fitting and holding a press-fitting claw portion 5f of a wall member 5 to be described later is provided in the lower portion of the spool chamber 1A near the opening 1d of the main body 1.
Is provided. Further, a locking portion 1g which is an elastic plate holding portion capable of locking a locking hole 5g of a wall member 5 which will be described later is disposed in the upper portion of the spool chamber 1A near the opening 1d. Further, the curvature restricting portion 1h which is a holding means capable of abutting the abutting portion 5h of the outer shape of the wall member 5 at a position near the locking portion 1g.
Is provided. The position of the curvature restricting portion 1h is set at a distance R3 from the center of the spool shaft. This distance R3
Is a dimension obtained by adding the plate thickness of the wall member 5 to the radius of curvature R1 of the inner diameter of the spool inner wall portion 1a.

The spool chamber opening 1d has a thickness of 0.
A spool wall member 5 which is an elastic plate of 1 mm or less is mounted. The spool wall member 5 constitutes a wall surface portion of the spool chamber 1A on the opening 1d, and is an arc-shaped elastically deformable plate member as shown in the perspective view of FIG.
Two press-fitting claw portions 5f, which are press-fitting portions into the concave portion 1f and project outward from the arcuate portion, are disposed on one end side of the wall member 5. In addition, two locking holes 5g that can be locked to the locking portion 1g and that are provided in a protruding portion that protrudes outward from the circular arc portion are provided on the other side portion.

FIG. 5 is a plan view showing the shape of the spool wall member 5 before and after being mounted in the free state. In the free state shown in FIG. 5A, the radius of curvature of the arc portion on the inner diameter side is shown. Is the dimension R2. Further, the angles formed by the press-fitting claw portion 5f and the projection portion in which the locking hole 5g is disposed with the arc portion are α ′ and β ′. The radius of curvature R2 of the wall member 5 on the inner diameter side is the radius of curvature R of the inner diameter of the spool inner wall portion 1a.
A value greater than 1.

When the wall member 5 is mounted in the spool chamber 1A of the camera of the present embodiment configured as described above, the press-fitting claw portion of the wall member 5 is inserted into the recess 1f of the spool chamber 1A as shown in FIG. Press in 5f. In that state, as shown in the press-fitting state diagram of FIG.
It deforms to the position of f (B), and the pressure input F1 is generated. Then, while the circular arc portion of the wall member 5 is elastically deformed, the locking hole 5g is locked to the locking portion 1g of the spool chamber 1A. In this state, as shown in the locking state diagram of FIG. 7, the contact portion 5h at the arc end of the wall member 5 is biased by the urging force F on the curvature regulating portion 1h.
The contact is made at 2 to regulate the curvature of the arc portion of the wall member 5.

An urging force F3 due to elastic deformation acts on the locking portion 1g. Press-fitting claw portion 5 due to the elastic deformation
The angles formed by f and the arcuate portion of the projection in which the locking hole 5g is disposed are α and β, which slightly increase.
Then, the radius of curvature of the inner diameter of the wall member 5 regulated by the curvature regulating portion 1h becomes the dimension R2 ', which is naturally smaller than the radius R2 and is close to the radius of curvature R1 of the inner diameter of the spool chamber inner wall portion 1a. Becomes

As described above, in the camera of the present embodiment, the spool chamber formed in the camera body has an opening shape so that the undercut portion is eliminated and the undercut portion does not occur during the molding process. To do. Since the spool wall member 5 which is an arcuate elastic plate is attached to the opening 1d to form the spool chamber 1A, the camera body can be easily manufactured and the cost can be reduced.

Next, the camera of the second embodiment of the present invention will be described with reference to FIGS. In addition, in FIG.
Is a perspective view around the spool chamber in the camera body, FIG.
FIG. 10 is a perspective view of the spool chamber wall member, and FIG. 10 is a transverse sectional view of the spool chamber wall member in a mounted state. The shape of the camera body 10 of the camera of this embodiment is substantially the same as that of the first embodiment, and does not have an undercut portion. Therefore, the description of the same shape portion of the camera body 10 will be given by using the same reference numerals as those in FIGS. However, as shown in FIG. 8, the main body 10 of the camera has a spool chamber 10A.
Two upper and lower shaft holes 1k for supporting the support shaft 18 (see FIG. 10) are provided outside the opening 1d.

On the other hand, the shape of the spool wall member 15 of the elastic plate mounted on the spool chamber opening 1d is the same as that of the wall member 5 of the first embodiment shown in FIG.
f, a locking hole 15g, an abutting portion 15h, etc. are provided, and the central portion thereof has an arc shape with a radius of curvature R2 '. The state of attachment to the spool chamber 10A is the same as in the case of the first embodiment.

Further, as shown in the perspective view of FIG. 9, the wall member 15 of this embodiment has an elastic protrusion which is an elastically deformable portion which extends in the spool axial direction and projects toward the spool axial center. A section 15i is provided. The elastic protrusion 15i acts to press the guide roller support plate 16 (see FIG. 10). On the other hand, the shaft hole 1 of the spool chamber 10A
As shown in FIG. 10, a roller support plate 16 that supports a guide roller 17 for pressing the film is rotatably supported on the support shaft 18 supported by k.

In the camera of this embodiment constructed as described above, the protrusion 15i is provided in the spool chamber 10A of the main body 10.
The wall member 15 having the above is attached in the same manner as that of the first embodiment. Then, in the case of the present embodiment, the protruding portion 15i presses the roller supporting plate 16. And
The guide roller 17 to which the roller support plate 16 is attached presses the film wound on the spool. As described above, in the present embodiment, the spool chamber wall member 15 which is applied because the undercut portion in the molding of the camera body 10 is not provided also has the function of urging the roller support plate 16, and the camera component member. It also contributes to the reduction of

Next, a camera showing a third embodiment of the present invention will be described with reference to the perspective view of the spool chamber wall member of FIG. 11 and the transverse sectional view of the spool chamber wall member in the mounted state of FIG. . The camera body applied to the camera of this embodiment uses the camera body 1 having the same shape as that of the first embodiment, and similarly does not have an undercut portion. Therefore,
The camera body 1 will be described using the same reference numerals as those in FIGS.

The shape of the elastic wall spool wall member 25 mounted in the spool chamber opening 1d applied to this embodiment is also the same as that of the wall member 5 of the first embodiment shown in FIG. The press-fitting claw portion 25f, the locking hole 25g, the contact portion 25h, and the like are provided, and the center portion thereof has an arc shape. The state of attachment to the spool chamber 1A is the same as in the case of the first embodiment.

The wall member 25 of this embodiment has the structure shown in FIG.
As shown in the perspective view of FIG. 1, an elastically projecting elastic projecting portion 25i that extends along an arc and projects toward the spool axis is provided. A film contact portion 25 for pressing the film on the spool is provided at the tip of the elastic protrusion 25i.
j is provided.

In the camera of the present embodiment constructed as described above, the wall member 25 is provided in the spool chamber 1A of the main body 1.
Are mounted in the same manner as in the first embodiment.
In the case of this embodiment, the contact portion 15j at the tip presses the film wound on the spool by the urging force of the elastic deformation of the arm portion 25i. As described above, also in the present embodiment, the spool chamber wall member 25 used to eliminate the undercut in the molding of the camera body 1 can also serve as the action of pressing the film wound around the spool, and the camera constituent member It also contributes to reduction.

[0026]

As described above, according to the camera of the present invention, since a part of the wall surface of the spool chamber of the camera body is formed by the elastic plate, the camera body can be formed without undercut. The cost and size of the camera body can be reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view around a spool chamber of a camera according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a cross section of a camera body applied to the camera of FIG. 1 and an arrangement of a shutter, a mirror unit, a lens unit and the like.

FIG. 3 is a perspective view around the spool chamber of the camera body of FIG.

4 is a perspective view of a spool chamber wall member applied to the camera body of FIG.

5A and 5B are views showing a mounted state of the spool chamber wall member of FIG. 4, wherein FIG. 5A shows a free state and FIG. 5B shows a mounted state.

6 is a diagram showing a press-fitting state of a press-fitting claw portion in a mounted state of a spool chamber wall member applied to the camera body of FIG. 2;

7 is a diagram showing a locked state of a locking hole in a mounted state of a spool chamber wall member applied to the camera body of FIG.

FIG. 8 is a perspective view around a spool chamber of a camera body of a camera according to a second embodiment of the present invention.

9 is a perspective view of a spool chamber wall member applied to the camera body of FIG.

10 is a view showing a state in which a spool chamber wall member applied to the camera body of FIG. 8 is mounted in a spool chamber.

FIG. 11 is a perspective view of a spool chamber wall member applied to a camera body of a camera according to a third embodiment of the present invention.

12 is a view showing a state in which a spool chamber wall member applied to the camera body of FIG. 11 is mounted in a spool chamber.

FIG. 13 is a cross-sectional view of a camera body of a conventional camera.

FIG. 14 is a cross-sectional view around a camera body of another conventional camera.

FIG. 15 is a cross-sectional view around a camera body of a camera showing still another conventional example.

[Explanation of symbols]

 5,15,25 …… Spool chamber wall member (elastic plate) 1g …………………… Locking part (holding means) 1h ………………. Curvature restricting part (holding means) 1f ………… … Recessed portion (holding means) 1A, 10A ……… Spool chamber 15i, 25i ……… Elastic protrusion

Claims (3)

[Claims] 1. A camera having a spool chamber for winding a film, wherein a wall surface forming a part of a peripheral surface of the spool chamber is formed of an elastic plate having an inner diameter different from the inner diameter of the spool chamber, The camera body is provided with a wall surface forming the remaining portion of the spool chamber, attachment of the elastic plate, and holding means for restricting the curved surface of the elastic plate so as to substantially match the inner diameter of the spool chamber. Characteristic camera. 2. The camera according to claim 1, wherein the elastic plate is formed to have a diameter larger than an inner diameter of the spool chamber. 3. The camera according to claim 1, wherein the elastic plate is further provided with an elastic protrusion for pressing the film against the spool.