JP3271829B2 - 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 camera, and more particularly to a structure of a spool chamber for winding a film.

[0002]

2. Description of the Related Art In general, a camera body applied to a camera is often manufactured by molding a metal or a resin. FIG. 13 shows a cross-sectional shape of the conventional camera body. The spool chamber for winding the film of the camera is provided with a spool chamber wall 50 of the camera body 50.
and a spool chamber wall member 51 which is a separate member. As shown in FIG. 13, a patrone 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 to be die-cut in the direction of the optical axis O at the time of molding, an undercut portion U is formed in the spool wall portion 50a forming the spool chamber, and the mold structure is reduced. It was complicated and very disadvantageous in production. However, if the undercut portion U is not provided in the spool chamber, the spool chamber is located outside the main body, which hinders downsizing of the camera.

Therefore, Japanese Unexamined Utility Model Publication No. 4-164440 and Japanese Unexamined Utility Model Publication No. 4-16441 have proposed a single-lens reflex camera having a camera body structure in which an undercut portion generated in a spool chamber is formed by a separate member. It is configured. FIG. 14 shows the above-mentioned conventional Japanese Utility Model 4-164.
FIG. 4 is a cross-sectional view around a camera body proposed in Japanese Patent Publication No. 40-240. In this camera, the camera main body 61 is provided with a wall 61a of a spool chamber, a cartridge chamber 61b, and an aperture 61c in the center. A focal plane shutter unit 63 is provided along the aperture 61c, and a 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 which is a separate member is provided 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 formed without an undercut portion.

[0005] FIG. 15 is a view showing the above-mentioned conventional actual flat tire 4-1.
FIG. 4 is a cross-sectional view around a camera body 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 configuration as that shown in FIG. In the conventional example, the spool chamber wall 7 disposed in the undercut portion U of the spool chamber is provided.
4a is formed integrally with the mirror box side wall 74.

[0006]

However, Japanese Utility Model Laid-Open No. 4-16440 and Japanese Utility Model Laid-Open No. 4-16444 described above.
The structure of the camera body of the single-lens reflex camera disclosed in Japanese Patent Publication No.
It is necessary to dispose a spool chamber wall member 62 or 74a, which is a molding member different from the one described above.
Disadvantages are inevitable.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and provides a camera which does not need to provide an undercut portion in a spool chamber of a camera body and which can be reduced in cost and size. The purpose is to do.

[0008]

The camera according to the present invention comprises:
In a camera having a spool chamber for film winding, it is molded integrally with the camera body and has a predetermined radius of curvature.
Inner wall having an inner wall surface that forms a part of the spool chamber
And molded into the camera body to form the spool chamber
Area that requires an inner wall surface with the specified radius of curvature
Area where the inner wall is open without being formed.
The mouth and the inner wall have a different curvature before installation.
Elastically deformable thin plate-like elastic member with curved surface shape
The predetermined curvature on the inner wall of the camera body.
It is regulated and held in an arc shape so that it substantially matches the radius.
By being attached, it covers the opening and
A spool wall member forming an inner wall surface of the spool chamber.
Characterized in that Bei was also the camera is arcuate
At both ends of the spool wall member which can be elastically deformed.
Formed on the inner wall and the opening formed on the inner wall.
Holding parts respectively located near both sides of the mouth, and the inner wall
The spool wall provided in the section and elastically deformed into an arc shape
Curvature restricting portion that can contact at least a part of the curvature surface of the member
And formed at both ends of the spool wall member.
The mounting portion is locked by the holding portion, and the music
The curvature regulating section regulates the arc-shaped curvature of the spool wall member.
Characterized in that the camera
Is attached to the spool wall member in the spool chamber.
The leading edge of the film comes into contact with the film wound around the
So that the elastic projections that project elastically
It is characterized by being formed .

[0009]

[Work] Formed integrally with the camera body.
A part of the spool chamber for film winding is elastically deformable
It is formed of a resilient member having a shape of a circle .

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing details of a patrone room 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 embodiment and the arrangement of each member around the body. The front of the aperture 1c of the camera body 1 is a focal plane shutter 2,
A mirror unit 3, a lens unit 4, and the like are provided. Note that, in the following description, the optical axes of the photographing lenses are all indicated by the symbol O.

The main body 1 of the camera according to the present embodiment is a member manufactured by molding, and the direction in which the mold is removed coincides with the optical axis O. As shown in FIG. 2, one side has a patrone chamber 1b, and the other side is provided with a part of the inner wall portion 1a of the spool chamber 1A. The radius of curvature of the inner diameter of the spool interior wall 1a is R1. The portion corresponding to the wall portion of the spool chamber 1A near the mirror unit 3, and the portion that is undercut when the die is cut off is formed as an opening 1d, and is formed without undercut. FIG. 3 shows the spool chamber 1A of the main body.
It is a perspective view around. A spool gear insertion hole 1e is provided on the bottom surface of the spool chamber 1A.

As shown in FIG. 1, a lower part of the spool chamber 1A close to the opening 1d of the main body 1 has a recess 1f capable of press-fitting and holding a press-fitting claw 5f of a wall member 5 described later.
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 described later, is provided above the spool chamber 1A near the opening 1d. In addition, a curvature restricting portion 1h, which is a holding means to which a contact portion 5h of the outer shape of the wall member 5 can contact in a position near the locking portion 1g.
Is provided. The position of the curvature restricting portion 1h is a position at a distance R3 from the center of the spool shaft. This distance R3
Is the dimension obtained by adding the thickness of the wall member 5 to the radius of curvature R1 of the inner diameter of the spool interior wall 1a.

In the spool chamber opening 1d, a plate 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 of the spool chamber 1A above the opening 1d, and is a circularly elastically deformable plate member as shown in the perspective view of FIG.
On one end side of the wall member 5, two press-fitting claws 5f, which are press-fit portions into the concave portion 1f and protrude outward from the arc portion, are provided. On the other side, two locking holes 5g are provided, which can be locked to the locking portion 1g, and are provided on protrusions protruding outward from the arc portion.

FIG. 5 is a plan view showing the shape of the spool wall member 5 before and after mounting in the free state. In the free state shown in FIG. 5A, the radius of curvature on the inner diameter side of the arc portion is shown. Is the dimension R2. The angles formed by the arc portions of the projections provided with the press-fitting claw portions 5f and the locking holes 5g are α ′ and β ′. The radius of curvature R2 on the inner diameter side of the wall member 5 is equal to the radius of curvature R2 of the inner diameter of the spool interior wall portion 1a.
Must be greater than 1.

When the wall member 5 is mounted on the spool chamber 1A of the camera of the embodiment constructed as described above, as shown in FIG. 1, the press-fitting claw portion of the wall member 5 is inserted into the recess 1f of the spool chamber 1A. Press in 5f. In this state, as shown in the press-fit state diagram of FIG.
It deforms to the position of f (B), and the press-in force F1 is generated. Then, the locking hole 5g is locked to the locking portion 1g of the spool chamber 1A while elastically deforming the arc portion of the wall member 5. In this state, as shown in the locked state diagram of FIG. 7, the abutting portion 5h of the arc end of the wall member 5 is applied to the curvature regulating portion 1h by the urging force F.
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. The press-fitting claw portion 5 is formed by the elastic deformation.
f, and the angle of the projection on which the locking hole 5g is formed with the arc portion is α, β, and each slightly increases.
The radius of curvature of the inner diameter of the wall member 5 regulated by the curvature restricting portion 1h is 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 interior wall 1a. Becomes

As described above, in the camera according to the present embodiment, the spool chamber formed in the camera body has an opening shape so as to eliminate the undercut portion and prevent the undercut portion from being produced due to the molding process. I do. Since the spool chamber 1A is formed by attaching the spool wall member 5, which is an arc-shaped elastic plate, to the opening 1d, the camera body can be easily manufactured and the cost can be reduced.

Next, a camera according to a second embodiment of the present invention will be described with reference to FIGS. Note that FIG.
9 is a perspective view around the spool chamber in the camera body, FIG.
Is a perspective view of a spool chamber wall member, and FIG. 10 is a cross-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 shaped portion of the camera body 10 will be described using the same reference numerals as those in FIGS. However, the camera body 10 has a spool chamber 10A as shown in FIG.
The upper and lower two shaft holes 1k that support 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 arranged, 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 that of the first embodiment.

Further, as shown in the perspective view of FIG. 9, the wall member 15 of the present embodiment has an elastic projection which is an elastically deformable portion which extends in the spool axis direction and projects toward the spool axis. A portion 15i is provided. The elastic protrusion 15i acts for pressing 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 for supporting a guide roller 17 for pressing a film is rotatably supported on the support shaft 18 supported by k.

In the camera of the present embodiment configured as described above, the protrusion 15i is provided in the spool chamber 10A of the main body 10.
Is mounted in the same manner as in the first embodiment. Then, in the case of the present embodiment, the protruding portion 15i presses the roller support plate 16. And
The film wound around the spool is pressed by the guide roller 17 to which the roller support plate 16 is attached. As described above, according to the present embodiment, the spool chamber wall member 15, which is applied in order to prevent the formation of the undercut portion in the molding of the camera body 10, also has the function of urging the roller support plate 16, and the camera component member It also contributes to the reduction of emissions.

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

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

In addition, the wall member 25 of this embodiment has a structure shown in FIG.
As shown in a perspective view of FIG. 1, there is provided an elastic protrusion 25i that extends along an arc and protrudes toward the axis of the spool so as to be elastically deformable. 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 configured as described above, the wall member 25 is attached to the spool chamber 1A of the main body 1.
Are mounted in the same manner as in the first embodiment.
Then, in the case of the present embodiment, the contact portion 15j at the distal end presses the film wound around the spool by the urging force due to 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 to press the film wrapped around the spool. It also contributes to reduction.

[0026]

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

[Brief description of the drawings]

FIG. 1 is a cross-sectional view around a spool chamber of a camera showing 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 a spool chamber of the camera body of FIG. 2;

FIG. 4 is a perspective view of a spool chamber wall member applied to the camera body of FIG. 2;

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

FIG. 6 is a diagram showing a press-fit 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;

FIG. 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. 2;

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.

FIG. 9 is a perspective view of a spool chamber wall member applied to the camera body of FIG. 8;

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

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

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

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

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

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 portion (holding means) 1h ... Curvature regulating portion (holding means) 1f ... ... recess (holding means) 1A, 10A ... spool chamber 15i, 25i ... elastic projection

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G03B 17/30 G03B 17/02

Claims (3)

(57) [Claims] 1. A camera having a spool chamber for film winding, wherein the camera is formed integrally with a camera body and has a predetermined radius of curvature.
An inner wall portion having an inner wall surface and forming a part of the spool chamber, and being molded on the camera body to form the spool chamber;
Therefore, in the area where the inner wall surface having the predetermined radius of curvature is required
An opening in which the inner wall is open without being formed
And a curved surface shape different from the curvature of the inner wall before installation
Made of a thin plate-like elastic member that can be elastically deformed,
The predetermined radius of curvature is approximately equal to the predetermined radius of curvature of the inner wall of the camera body.
It is mounted and held in a circular arc shape so that it matches
By covering the opening,
Camera, wherein the spool wall member forming the inner wall surface of the Le chamber, by comprising a. 2. The spool which is elastically deformable into an arc shape.
Attachment portions respectively formed at both ends of the wall member, and formed near the both sides of the opening formed on the inner wall portion, respectively.
And the holding member provided on the inner wall portion and elastically deformed into an arc shape.
A curve that at least a part of the curvature surface of the pool wall member can contact
Comprising a rate regulating section, the upper the mounting portion formed on both ends of the spool wall member
Locking by the holding section and the curvature regulating section.
To restrict the arc-shaped curvature of the spool wall member.
The camera according to claim 1, characterized in that the. 3. The spool wall member is provided with the spool
The tip of the film is wound around the spool shaft in the room.
2. An elastic projecting portion, which is elastically deformable and projects so as to contact and press, is integrally formed.
The camera according to.