JPH08320524A - Film pressure plate for camera - Google Patents

Abstract

PURPOSE: To provide a film pressure plate made of plastic for a camera whose surface hardness is enhanced by an inexpensive producing method and which is improved on abrasion resistance to film. CONSTITUTION: This film pressure plate 10 has structure that a protective film 1a obtained by laminating a hard coating layer 2a on the surface of a base layer 2b is laminated on the surface of a base part 1b made of plastic material. The film pressure plate 10 is integrally molded by inserting the protective film 1a and injection-molding the base plate 1b. The hard coating layer 2a of the protective film 1a appears to the surface 12 of the film pressure plate 10, thereby improving on the abrasion resistance to the film.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure plate for a camera.

[0002]

2. Description of the Related Art In general, a photographing portion of a camera is provided with a pressure bonding plate which is brought into light contact with a non-exposed surface of a film in order to maintain the flatness of the exposed surface of the film. As such a crimping plate for a camera, conventionally, a surface-finished product obtained by pressing an aluminum material or a plastic-molded product is used. Usually, the pressure bonding plate made of aluminum has a large number of manufacturing steps, resulting in high manufacturing cost. On the other hand, the crimp plate made of plastic can be manufactured relatively inexpensively. Therefore, the pressure plate made of plastic is used in a popular compact camera and the like.

However, since the pressure-bonded plate made of plastic has a lower surface hardness than the pressure-bonded plate made of aluminum, the surface of the pressure-bonded plate is scraped by contact with the film and edges and burrs are likely to occur. Therefore, the plastic pressure-bonded plate may damage the film being fed, which is inferior to the aluminum pressure-bonded plate in terms of quality.

In order to solve this problem, in a pressure plate made of plastic, for example, an aromatic polycarbonate resin containing an additive is used to improve characteristics such as abrasion resistance (for example, Japanese Patent Laid-Open No. 2-217830). ), Measures such as UV coating on the surface after molding are implemented. But,
In all cases, there is a problem that the manufacturing cost of the crimping plate increases due to the countermeasure.

Further, in a camera of the type in which the date is imprinted on the film via the pressure bonding plate, for example, as shown in the schematic sectional view of FIG. 6, the date imprinting device 4a is provided on the back cover together with the pressure bonding plate 4b. In this type of camera, the date imprinting device 4a is provided on the opposite side of the pressure plate 4b from the film 4c. Then, the date imprinting device 4a imprints the date on the film 4c through the through opening hole 4d formed in the pressure bonding plate 4b.

However, since the through-opening 4d is formed in the pressure-bonding plate 4b, the film 4c is in contact with the surface 4e of the pressure-bonding plate 4b in a portion other than the through-hole 4d of the pressure-bonding plate 4b, but the through-hole 4d. The portion 4d does not contact the crimping plate 4b. Therefore, there is a problem that the flatness of the film 4c is deteriorated at the portion of the through opening hole 4d and the resolution is deteriorated.

[0007]

SUMMARY OF THE INVENTION Therefore, the first technical problem to be solved by the present invention is to make a plastic pressure-bonding plate for a camera, which has an improved surface hardness and an improved abrasion resistance against a film by an inexpensive manufacturing method. Is to provide.

A second technical problem to be solved by the present invention is to solve the above-mentioned first technical problem, and the date imprinting can be performed through the pressure bonding plate without deteriorating the flatness of the film. It is to provide a possible crimping plate.

[0009]

In order to solve the above technical problems, the present invention provides a crimping plate for a camera having the following configuration.

That is, a pressure plate for a camera is formed by laminating a protective film having a hard coat layer laminated on the surface of a base layer on the surface of a base plate made of a plastic material.
That is, the hard coat layer, the base layer, and the base plate are laminated in this order.

In the above structure, the base layer of the protective film and the base plate are in contact with each other, and the hard coat layer of the protective film appears on the surface of the pressure-bonding plate. The hard coat layer of the protective film is formed on the base layer by, for example, coating or vapor deposition before the protective film is laminated on the base plate. The surface hardness of this hard coat layer can be easily increased, and for example, the hard coat layer can be a layer having a surface hardness similar to that of a conventionally used surface-hardened aluminum pressure-bonded plate. The hard coat layer of the protective film is
Since the protective film and the base plate already have a predetermined surface hardness when laminated, there is no need to perform a special treatment such as a surface hardening treatment after the lamination. Further, it is sufficient to use a special material having a high hardness only for the hard coat layer of the protective film, and it is not necessary to use a special material such as a high hardness material for the base plate.

Therefore, the pressure-bonding plate for a camera having the above structure is a plastic pressure-bonding plate for a camera whose surface hardness is increased and abrasion resistance against a film is improved by an inexpensive manufacturing method.

Preferably, a date imprinting opening penetrating a predetermined portion of the base plate is formed, and the protective film is transparent.

In the above structure, when a date imprinting device for imprinting the date and the like on the film is provided on the back side of the crimping plate, the light rays from the date imprinting device are passed through the opening holes of the base plate of the crimping plate. Is irradiated toward the front side of the. The protective film laminated on the base plate extends to the through-hole portion, but is transparent and thus allows the light rays from the date imprinting device to pass through. Further, the photographic film is in contact with and supported by the protective film over the entire surface of the crimping plate, including the opening hole portion.

Therefore, in the pressure-bonding plate having the above structure, the date and the like can be imprinted through the pressure-bonding plate without deteriorating the flatness of the film.

In the above structure, it is also possible to bond the protective film and the base plate with an adhesive or an adhesive tape.

Preferably, the pressure plate for a camera is formed by injection molding the base plate with the protective film as an insert.

In the above structure, the protective film and the base plate are integrally formed by insert molding of the crimping plate. By this molding method, the crimping plate can be continuously and efficiently manufactured.

In the above structure, a metal foil or the like may be used as the protective film, but if the base layer of the protective film is made of the same plastic material as the base plate, it is more strongly laminated by melting at the boundary surface. It

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A camera crimping plate according to an embodiment of the present invention will be described in detail below with reference to FIGS.

FIG. 1 is a perspective view showing the basic construction of a pressure plate for a camera according to the present invention. FIG. 2 is a perspective view of a crimping plate for a camera according to the first embodiment of the present invention. FIG. 3 shows FIG.
FIG. FIG. 4 is a perspective view showing a method of mounting a hard coat-treated protective film. Figure 5
It is sectional drawing of the metal mold | die for manufacturing for the crimping board for cameras of FIG. FIG. 6 is a schematic cross-sectional view of a conventional date imprinting portion. FIG. 7 is a plan view of a crimping plate for a camera according to the second embodiment of the present invention. 8 is a cross-sectional view of the camera crimping plate of FIG. 7.

First, a crimping plate for a camera according to a first embodiment of the present invention will be described with reference to FIGS.

That is, the pressure bonding plate 10 for a camera of the present invention.
Basically, as shown in FIG. 1, the protective film 1a and the base plate 1b, which have been previously hard-coated, are laminated. More specifically, as shown in FIGS. 2 and 3, the protective film 1a that has been hard-coated in advance is used.
Is obtained by laminating the hard coat layer 2a on the base layer 2b. The hard coat layer 2a is formed by selecting a material so as to have the same surface hardness as that of a conventional aluminum pressure-bonded plate which has been subjected to a surface hardening treatment. The hard coat layer 2a of the protective film 1a is on the outside, and the base layer 2 of the protective film 1a is
Protective film 1 with b adjacent to base plate 2b
The base plate 1b is integrally formed with a.

Next, a method of manufacturing the crimp plate 10 will be described.

That is, first, the protective film material in which the hard coat layer 2a is previously formed on the base layer 2b is punched by pressing to prepare the protective film 1a formed in a predetermined shape. Next, the protective film 1a is inserted into the concave surface of the cavity mold 3a of the molding die.
At this time, the hard coat layer 2a of the protective film 1a is made to face the concave surface of the cavity mold 3a. The outer shape of the protective film 1a and the cavity shape of the cavity mold 3a are
It substantially corresponds to the final shape of the crimping plate 10. Next, the core mold 3b is aligned with the cavity mold 3a so as to be clamped, and the molding resin 3c is injected. If the base layer 2b of the protective film 1a and the molding resin 3c are made of the same kind of plastic material, they are more strongly adhered by melting at the boundary between the two. Then, the mold is opened, the branch portion of the resin sprue is removed, and the main body portion is finished into a predetermined shape. For example, the base layer 2b and the base plate 1b of the protective film 1a are made of polycarbonate, and the hard coat layer 2a of the protective film 1a is made of silicon hard coat. When manufactured as described above, the hard coat layer 2a is formed on the surface simultaneously with the molding of the pressure bonding plate 10. According to this method, a post-process for increasing the surface hardness such as an alumite treatment conventionally performed in the production of aluminum pressure-bonded plates and a UV coating treatment conventionally performed in the production of plastic pressure-bonded plates is performed. Since it is unnecessary, it contributes to cost reduction by shortening the process. In addition, since only the hardness of the surface 12 that requires hardness is increased, there is no waste of using a special material that increases hardness for the entire pressure bonding plate 10.

Therefore, the plastic pressure-bonding plate 10 of the above embodiment can increase the surface hardness and the abrasion resistance of the film by an inexpensive manufacturing method.

Next, the plastic crimping plate 20 used in a camera of the type in which the date or the like is imprinted on the film through the crimping plate 20 will be described.

That is, as shown in FIGS. 7 and 8, the pressure-bonding plate 20 is formed by integrally molding the protective film 1a which has been previously hard-coated on the base plate 1b, as in the first embodiment. . That is, the protective film 1a is the base layer 2b.
The hard coat layer 2a is formed on the protective film 1a. The hard coat layer 2a of the protective film 1a is on the outside of the pressure bonding plate 20, and the base layer 2b of the protective film 1a and the base plate 1b are adjacent to each other. It is similar to the embodiment.

However, the protective film 1a may be opaque in the first embodiment, but transparent in the second embodiment. Also, for imprinting the date on the base plate 1b,
An opening hole 5 penetrating therethrough is formed at a predetermined position.

In the above structure, the date imprinting device is
The date is imprinted on the film through the opening 5 of the base plate 1b, which is provided on the base plate 1b side of the pressure bonding plate 20, through the transparent protective film 1a. The protective film 1a is the base plate 1b.
The entire surface 22 on the film side of the crimping plate 20 including the opening 5 is continuously extended. Therefore, the film is continuously in contact with and supported by the entire surface 22 of the pressure bonding plate 20, so that the flatness is not lowered and the resolution is not lowered.

Therefore, in the second embodiment, the date can be imprinted through the pressure bonding plate without deteriorating the flatness of the film.

The present invention is not limited to the above embodiments, but can be implemented in various other modes. For example, not only the date but also the number, message, etc. can be imprinted from the opening hole 5.

[Brief description of drawings]

FIG. 1 is a perspective view showing a basic configuration of a crimping plate for a camera according to the present invention.

FIG. 2 is a perspective view of a camera crimping plate according to the first embodiment of the present invention.

3 is a cross-sectional view of FIG.

FIG. 4 is a perspective view showing a method of mounting a hard-coated sheet.

5 is a cross-sectional view of a molding die for manufacturing the camera crimping plate of FIG.

FIG. 6 is a schematic cross-sectional view of a conventional date imprinting portion.

FIG. 7 is a plan view of a crimping plate for a camera according to a second embodiment of the present invention.

8 is a cross-sectional view of the camera crimp plate of FIG.

[Explanation of symbols]

 1a Protective film 1b Base plate 2a Hard coat layer 2b Base layer 3a Cavity type 3b Core type 3c Molding resin 4a Date imprinting device 4b Crimping plate 4c film 4d Open hole 5 Opening hole 10 Crimping plate 12 Film side surface 20 Crimping plate 22 film Side surface

Claims (3)

[Claims] 1. A hard coat layer (2a) on the surface of a base layer (2b).
A crimping plate for a camera, characterized in that a protective film (1a) is laminated on the surface of a base plate (1b) made of a plastic material. 2. A date imprinting opening (5) penetrating a predetermined portion of the base plate (1b) is formed, and the protective film (1a) is transparent. Crimping plate for camera. 3. The pressure plate for a camera according to claim 1, wherein the base plate (1b) is injection-molded with the protective film (1a) as an insert.