JPH1048738A - Optical equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical equipment which has a back surface member provided with a function as a pressing plate and a function to guide film to a film path and whose manufacture does not take time and labor. SOLUTION: This optical equipment has back surface members 9 and 10 attached to the back surface of an equipment main body 1 having a cartridge chamber 1a and the film path 1i for the exposure and the observation of a film 1. The pressing plate part 9a facing to the film path 1i and a guide part 10a in an inclined surface state or a curve surface state facing to the chamber 1a and guiding the leading end of the film 1 to the film path 1i are provided on the members 9 and 10, the part 9a is made of metal, and the part 1a is made of resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film accommodating portion (a cartridge chamber, a film passage and a spool chamber) formed in a main body of an optical device such as a camera or a film viewer.
The present invention relates to an optical device in which a back side opening of the optical device is covered by a back member such as a pressure plate.

[0002]

2. Description of the Related Art Inside cameras and film viewers,
A film passage (tunnel) for exposing and observing the film is formed facing the aperture opening, and a metal side wall which is in sliding contact with the film and holds it in a flat plate shape is formed on a rear side wall surface of the film passage. A pressure plate is attached.

Further, a film cartridge loaded in these cameras and film viewers is of a type in which a film contained in the cartridge is pushed out of the cartridge by rotating a spool provided in the cartridge. (Eg, US Pat. No. 4,841,319).

When such a film cartridge is used by being loaded into a cartridge chamber, a pressure plate includes:
As proposed in Japanese Patent Application Laid-Open No. 7-5561 (hereinafter referred to as Japanese Patent Application Laid-Open No. 7-5561), a guide portion is formed to guide the leading end of the film extruded from the cartridge so as to smoothly enter the film passage from the cartridge chamber. ing.

Japanese Patent Application Laid-Open No. 5-142635 (hereinafter referred to as Japanese Patent Application Publication No. 5-142635) has a light-shielding member for opening and closing a back opening of a film passage in a film accommodating portion, and a pressure plate is fixed to the light-shielding member. Cameras have been proposed.

[0006]

However, in the camera proposed in Japanese Patent Laid-Open Publication No. H11-209, an inclined or curved guide portion is formed by bending the end of the pressure plate on the cartridge chamber side. There is a problem in that it takes time and effort to manufacture the device, and the manufacturing cost tends to be high.

If the pressure plate is made of resin, the main body and the guide portion of the pressure plate can be formed at the same time, so that the problem of manufacturing cost can be solved. However, if the pressure plate is made of resin, the main body may be shaved due to sliding contact with the film, and shaving powder may adhere to the film or damage the film.

In addition, in the camera proposed in Japanese Patent Laid-Open Publication No. H08-209, the light-shielding member is not fixed to the camera body, so that the light-shielding member is pushed together with the pressure plate by the curling force of the film in the film passage, and the gap between the pressure plate and the camera body. There is a gap,
There is a possibility that a film may enter this gap.

Even if the light-shielding member is fixed to the camera body, it is necessary to keep the parts in close contact with each other so that there is no gap between the light-shielding member and the camera body and between the pressure plate and the camera body. It is difficult due to manufacturing errors.

Therefore, a first object of the present invention is to provide a function of a pressure plate and a function of guiding a film to a film path.
An object of the present invention is to provide an optical device having a back member that does not require much time for manufacturing.

It is a second object of the present invention to provide an optical apparatus in which a gap in which a film enters a film path is not generated.

[0012]

In order to achieve the above object, the first invention of the present application has a back member attached to the back of an apparatus body having a cartridge chamber and a film passage for exposing or observing a film. In the optical device, the back plate is provided with a pressure plate portion facing the film passage, and a sloped or curved guide portion facing the cartridge chamber and guiding the leading end of the film to the film passage. And the guide is made of resin.

In other words, the pressure plate portion to which the film always slides when the cartridge is used is made of metal to prevent scraping, while the guide portion which the film slides only when the leading end of the film extruded from the cartridge is guided to the film passage is made of resin. By doing so, it is not necessary to use parts that require a lot of time and effort for manufacturing as in a conventional pressure plate, and the manufacturing cost is reduced.

The back member having the pressure plate portion and the guide portion may be formed as an integrally molded component by a molding method or the like, or a metal pressure plate and a resin material holding the pressure plate and having a guide portion. May be made as an assembly part with the pressure plate holding member.

In the latter case, the portion covering the rear opening of the cartridge chamber or the spool chamber is formed integrally with the pressure plate holding member, so that the opening or the outer member formed in the outer member of the conventional optical apparatus is formed. It is desirable to eliminate the need for the light-blocking member provided at the joint between them, etc. In addition, the pressure plate is sandwiched between the device main body and the pressure plate holding member to be in close contact with the device main body, thereby preventing a gap from entering the film. It is desirable to do.

Further, by providing a mounting portion (joining portion) between the back member and the main body of the device at a position facing the case of the film cartridge loaded in the cartridge chamber, external light can temporarily enter the cartridge chamber through the mounting portion. Even if it leaks, it is desirable that the case of the cartridge prevent this external light from hitting the film.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) FIGS. 1 and 2 show a camera according to a first embodiment of the present invention. In these figures, reference numeral 1 denotes a camera body, and the camera body 1 has a cartridge chamber 1a in which a film cartridge 2 is loaded.
A spool chamber 1b accommodating a film take-up spool 4, and a film passage 1 facing the aperture opening 1c.
e is formed.

The film cartridge 2 is rotated by a motor (not shown) attached to the camera body 1 to rotate the spool 2a in the cartridge.
This is a type of film cartridge in which the film 3 is pushed out of the cartridge 2.

Reference numerals 6 and 8 denote rollers for pressing the film 3 against the take-up spool 4. These rollers 6 and 8 are wound by roller holders 5 and 7 pressed into recesses formed in the inner wall of the spool chamber 1b. It is rotatably held in a state of being urged in the direction of pressing against the take-up spool 4.

Reference numeral 9 denotes a pressure plate (a pressure plate portion referred to in the claims) made of metal such as aluminum, which is fixed to the back of the camera body 1 and covers the opening on the back side of the film passage 1i.

Reference numeral 10 denotes a guide member (guide portion referred to in the claims) made of resin, which is integrally formed with the pressure plate 9 by a molding method or the like. The guide member 10 has a film passage 1 facing the cartridge chamber 1a.
Guide surface 10a inclined with respect to the film feeding direction of i
Are formed.

Reference numeral 11 denotes an exterior member of the camera, and reference numeral 12 denotes a motor which is built in the take-up spool 4 and rotationally drives the spool.

In the camera constructed as described above, when the film 3 is pushed out from the cartridge 2 as shown in FIG. 2, the leading end 3a of the film 3 hits the guide surface 10a of the guide member 10 and then the guide surface 10a. Guided by 10a to the film path 1i.

Film 3 entering film passage 1i
Moves toward the spool chamber 1b while being kept substantially flat by the sliding contact surface 9a of the pressure plate 9 and an inner rail (not shown) formed in the film passage 1i. When the leading end 3a of the film 3 enters the spool chamber 1b, the leading end 3a is pressed against the winding spool 4 by the rollers 6 and 8, and is wound around the winding spool 4. At this point, the spool 2a in the cartridge becomes free, and the spool 4
The film is positioned at a position where the first frame of the film is opposed to the aperture opening 1c by the rotational driving force.

Then, the take-up spool 4 is provided for each frame shot.
Is driven to rotate the film, and after the last frame is photographed, the take-up spool 4 becomes free, and the spool 2a in the cartridge is driven to rotate to perform the film rewinding.

In this camera, the film is fed in this manner. The film 3 almost always slides on the sliding surface 9a of the pressure plate 9, while the guide 3a guides the leading end 3a of the film 3 on the guide surface 10a. Only when the film 3 is in sliding contact. For this reason, even if the guide surface 10a is not made of metal like the pressure plate 9, there is no fear of scraping due to sliding contact with the film 3. Therefore, by forming the guide member 10 from a resin that is easy to mold and fixing the guide member 10 to the metal pressure plate 9, the pressure plate 9 and the guide can be reliably prevented from being scraped by sliding contact with the film 3. The entire back member including the member 10 can be easily manufactured.

In the present embodiment, the guide surface 10a of the guide member 10 is formed in a slope, but in the present invention, the guide surface may be formed in a curved shape.

(Second Embodiment) FIGS. 3 to 5 show a camera according to a second embodiment of the present invention. Note that, in the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals as those in FIGS.

FIG. 3 shows the back of the camera body 1.
Reference numeral 1d denotes an opening on the back side of the cartridge chamber 1a. Also,
As can be seen from FIG. 5, inner rails 1f, which extend from the front to the back of the film passage 1i and extend in the left and right direction (film feeding direction) above and below the aperture opening 1c.
1e is formed, and these inner rails 1f, 1
e, the inner rail 1 from the front of the spool chamber 1b.
Outer rails 1h and 1g are formed so as to protrude further in the rear direction than f and 1e and extend in the left-right direction.

In FIG. 4, reference numeral 19 denotes a pressure plate made of metal such as aluminum, and reference numeral 20 denotes a resin pressure plate holding member for holding the pressure plate 19. The pressure plate holding member 20 is fixed to the back surface of the outer rails 1h and 1g by screws, and the pressure plate 19 is sandwiched between the pressure plate holding member 20 and the outer rails 1h and 1g. Thus, the pressure plate 19 and the pressure plate holding member 20 attached to the camera body 1 cover the cartridge chamber 1a, the spool chamber 1b, and the opening on the back side of the film passage 1i.

More specifically, the pressure plate holding member 2
Reference numeral 0 denotes a pressing plate holding portion 20d for holding the pressing plate 19 with the camera body 1 as described above, and a guide surface facing the cartridge chamber 1a and inclined with respect to the film feeding direction. Part) 20c, a cartridge chamber light-shielding part 20a that covers the rear side opening 1d of the cartridge chamber 1a to prevent outside light from entering the cartridge chamber 1a, and a spool chamber 1b that covers the rear side opening of the spool chamber 1b. And a spool chamber light-shielding portion 20b for preventing outside light from entering the outside. The roller holder 7 described in the first embodiment is attached to the spool chamber side wall surface of the spool chamber light-shielding portion 20b.

Here, the abutting portion (attachment portion in the claims) of the cartridge chamber light-shielding portion 20a and the camera body 1 has a stepped shape in a plan view so as to easily block external light. I have. The butting portion is located at a position facing the side surface of the case of the film cartridge 2 loaded in the cartridge chamber 1a. Even if external light leaks through the butting portion, the film cartridge 2
The side surface of the case can prevent the external light from hitting the film 3. The joint between the spool chamber light-shielding portion 20b and the camera body 1 is also formed in a shape suitable for preventing external light from entering.

In the camera constructed as described above, when the film 3 is pushed out from the cartridge 2, the leading end 3a of the film 3 abuts against the guide surface 20c of the pressure plate holding member 20, and then the film path 1i is guided by the guide surface 20c. Will be guided to.

The film 3 entering the film path 1i
Moves toward the spool chamber 1b while being kept substantially flat by the sliding contact surface 19a of the pressure plate 19 and the inner rails 1f and 1e. When the leading end 3a of the film 3 enters the spool chamber 1b, the leading end 3a is pressed against the winding spool 4 by the rollers 6 and 8, and is wound around the winding spool 4. At this time, the spool 2a in the cartridge becomes free, and the rotation of the take-up spool 4 positions the film at a position where the first frame of the film faces the aperture opening 1c.

Then, the take-up spool 4 is provided for each frame taken.
Is driven to rotate the film, and after the final frame is photographed, the take-up spool 4 becomes free and the spool 2a in the cartridge is driven to rotate to perform the film rewinding.

In this camera, the film is fed in this manner. The film 3 almost always slides on the sliding surface 19a of the pressure plate 19, while the guide surface 20c guides the leading end 3a of the film 3. Only when the film 3 is in sliding contact. For this reason, even if the guide surface 20c is not made of metal like the pressure plate 19, there is no fear of shaving due to sliding contact with the film 3. Therefore, the pressure plate holding member 20 including the guide surface 20c is made of an easily moldable resin, and the pressure plate holding member 20 is attached to the camera body 1 together with the metal pressure plate 19. Plate 1 while reliably preventing shaving due to sliding contact of
9 and the entire back member including the pressure plate holding member 20 can be easily manufactured.

In this embodiment, the pressure plate holding member 20
The guide surface 20c is formed in an inclined surface, but in the present invention,
The guide surface may be formed in a curved shape.

In each of the above embodiments, a camera has been described. However, the present invention can be applied to an optical apparatus other than a camera, such as a film viewer.

[0039]

As described above, according to the first aspect of the present invention, the pressure plate portion of the back member to which the film always slides when the cartridge is used is made of metal, and is formed into the film passage at the leading end of the film pushed out of the cartridge. Since the guide part where the film slides only at the time of the guide is made of resin, it is not necessary to use a component that takes time and effort to manufacture like a conventional pressure plate with a guide part, and the manufacturing cost of the camera can be reduced. . Further, in the case where the back plate is formed as an assembly part of a metal pressure plate and a resin pressure plate holding member for holding the pressure plate, a light shielding portion covering the rear opening of the cartridge chamber or the spool chamber is formed by the pressure plate holding member. When formed integrally with the camera, it is possible to eliminate the need for a light-shielding member provided at an opening formed in an exterior member of a camera or a joint between the exterior members, thereby reducing the number of parts and reducing manufacturing costs. Can be kept cheap.

Further, if the pressure plate is sandwiched between the camera body and the pressure plate holding member and is brought into close contact with the camera body, it is possible to reliably prevent the formation of a gap into which the film enters the film passage.

If the mounting portion between the back member and the camera body is made to face the case of the film cartridge loaded in the cartridge chamber, even if external light leaks from the mounting portion into the cartridge chamber. The external light can be prevented from hitting the film by the case of the cartridge.

[Brief description of the drawings]

FIG. 1 is a plan cross-sectional view of a camera (immediately after starting autoloading) according to a first embodiment of the present invention.

FIG. 2 is a plan sectional view of the camera (after auto loading is completed).

FIG. 3 is a rear view of a camera body of a camera according to a second embodiment of the present invention.

FIG. 4 is a plan sectional view of the camera according to the second embodiment.

FIG. 5 is a side sectional view of the camera according to the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Camera main body 1a Cartridge chamber 1b Spool chamber 1c Aperture opening 1i Film passage 2 Film cartridge 3 Film 4 Take-up spool 9, 19 Pressure plate 10 Guide member 10a, 20c Guide surface 11 Exterior member 20 Pressure plate holding member

Claims (9)

[Claims] 1. An optical apparatus having a back member attached to the back of an apparatus main body having a cartridge chamber and a film passage for exposing or observing a film, wherein the back member includes a pressure plate portion facing the film passage. ,
An optical device having a guide portion facing the cartridge chamber and guiding a leading end of the film into the film passage, wherein the pressure plate portion is made of metal, and the guide portion is made of resin. . 2. The optical device according to claim 1, wherein the guide portion is formed in a slope. 3. The optical apparatus according to claim 1, wherein the guide is formed in a curved shape. 4. The optical device according to claim 1, wherein the back member is an integrally molded part. 5. The back member is an assembled part of a metal pressure plate facing the film passage, and a resin pressure plate holding member holding the pressure plate and having the guide portion. The optical device according to claim 1. 6. The optical apparatus according to claim 5, wherein a portion that covers a rear opening of the cartridge chamber is formed integrally with the pressure plate holding member. 7. The apparatus main body has a spool chamber in which a film take-up spool is accommodated, and a portion that covers a rear opening of the spool chamber is formed integrally with the pressure plate holding member. The optical device according to claim 5, wherein: 8. The optical device according to claim 5, wherein the pressure plate is sandwiched between the device main body and the pressure plate holding member. 9. The optical device according to claim 1, wherein an attachment portion between the back member and the device main body faces a case of a film cartridge loaded in the cartridge chamber. .