JPH07219031A - Camera - Google Patents

Abstract

PURPOSE:To prevent the electrification condensing-A inside a camera by installing a grounded section having conductivity on the inside wall of a cartridge chamber and making the section brought into contact with a cartridge main body. CONSTITUTION:The section 28 constituted of a thin metal plate is provided inside the cartridge chamber 22. One end of the section 28 is stuck to true inside want or the cartridge chamber 22, and is brought into contact with the external periphery of the cartridge main body 13 in the case of loading the cartridge main body 13 inside the cartridge chamber 22. The section 28 is connected to the negative terminal of the power source of the camera 20 through a main body part 21 and is grounded. Furthermore, the end part of the section 28 on a side which is not stuck to the inside wall of the cartridge chamber 22 has elasticity in a direction to push the cartridge main body 13, and works as an ejector in the case of opening a back cover 26. Consequently, generated static electricity is immediately grounded through the main body part 21 of the camera 20 from the surface of the cartridge main body 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera loaded with a photographic film cartridge integrally molded of resin.

[0002]

2. Description of the Related Art A 135 type photographic film cartridge which is most popular at present is a 35 mm wide strip-shaped photographic film in which a spool around which one end is fixed and wound is housed in the cartridge body. The cartridge main body is composed of a cartridge thin metal plate body and two caps, but recently, one integrally molded of resin has been proposed. The photographic film cartridge using the resin cartridge main body can be reused as a resin material after being crushed after use, and can contribute to effective use of resources.

As described above, in the camera using the strip-shaped photo film housed in the main body of the film cartridge, the photo film set in the film cartridge room is pulled out from the film film by a predetermined length, and the film film is wound in the film roll chamber. While shooting. When the photographing of all the photo films is completed, the photographed film in the film roll chamber is rewound into the main body of the cartridge again. In addition, recently, immediately after loading the photo film cartridge into the camera, all unexposed photo film is taken up from the patrone body into the film roll chamber, and the photographed film is rewound into the patrone body for shooting. There is also a prewind camera.

In any of the above cameras,
Cameras that take pictures while feeding the photo film generally have a built-in electric motor for feeding the film,
The rotation of the motor rotates the spool so that the photographic film can be pulled out and rewound at high speed.

[0005]

However, when the above-mentioned resin photographic film cartridge is loaded and used in such a camera, the photographic film is rubbed against the inner wall of the cartridge when the film is fed, and static electricity is generated. It's easy to do. Moreover, since the resin cartridge main body is a dielectric, the generated static electricity is accumulated in the cartridge main body. For this reason, when the accumulated static electricity is discharged, a spark is generated in the camera, and the photographic film is exposed to a light other than the photographing light.

The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a camera capable of preventing accumulation of static electricity generated during feeding of a photographic film.

[0007]

In order to achieve the above object, the camera of the present invention is provided with an electrically conductive and grounded piece inside a cartridge chamber, and the piece is brought into contact with the cartridge body. Is. Further, it is preferable that this section is formed of a flexible metal thin plate, one end of which is fixed to the inner wall of the cartridge chamber, and the other end of which is biased in a direction to push the cartridge body out of the cartridge chamber. Alternatively, one end of the section may be attached to the back cover of the camera and the other end may press the patrone body into the patrone chamber. Further, it is preferable to provide a plurality of pieces so that each piece contacts the cartridge body.

In the camera according to the fifth and sixth aspects, the spool fork to be engaged with the spool is made of metal or conductive resin, and a metal grounded brush is provided in the cartridge chamber. The brush and the spool fork are brought into contact with each other.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 4 shows an example of a photographic film cartridge used in the camera of the present invention. The photographic film cartridge 10 is made of a resin integrally molded product, and is composed of a spool 12 around which the photographic film 11 is wound, and a cartridge main body 13 for accommodating the spool 12. The cartridge main body 13 is composed of an upper case 14 and a lower case 15, and a photographic film entrance 16 for sending the photographic film 11 to the joint between the upper case 14 and the lower case 15.
Are formed. The photographic film entrance / exit 16 is provided with a pair of telemeters 17 for preventing light from entering there. The light-shielding member of the photographic film entrance / exit 16 is not limited to the telemp, but is disclosed in, for example, Japanese Patent Laid-Open No.
As shown in FIGS. 1 to 27 of Japanese Patent Laid-Open No. 241234, the present invention can be applied to a photographic film cartridge in which an opening and closing cover member is used to shield the entrance and exit of the photographic film.

FIG. 1 shows a camera according to the present invention. The body portion 21 of the camera 20 is provided with a cartridge chamber 22 and a film roll chamber 23. The cartridge body 22 is loaded with the cartridge body 13, and the film roll chamber 23 is provided with a take-up spool 24 for winding up the photographic film 11 pulled out from the cartridge body 13. An aperture 25 is formed between the patrone chamber 22 and the film roll chamber 23 to determine the exposure range for the photographic film 11 and the back cover 2
The photo film 11 is positioned in the optical axis direction in cooperation with a film pressure plate 27 elastically attached to the photo film 6.
Further, the spring portion 26 a provided with the back cover 26 presses the cartridge body 13 into the cartridge chamber 22.

A section 28 made of a thin metal plate is provided inside the cartridge chamber 22. This section 28
As shown in FIG. 2, one end thereof is fixedly attached to the inner wall of the cartridge chamber 22 and comes into contact with the outer periphery of the cartridge body 13 when the cartridge body 13 is loaded into the cartridge chamber 22. The section 28 is connected to the negative terminal of the power source of the camera 20 via the main body 21 and is grounded. Further, in this section 28, the end 28a on the side not fixed to the inner wall of the cartridge chamber 22 has the cartridge body 13
It has elasticity in the direction of pushing out and acts as an ejector when the back cover 26 is opened.

FIG. 3 shows the outline of the feeding mechanism of the camera. On one edge of the photo film 11, the photographing frames 11a, 11 defined by the aperture 25 are provided.
One perforation 29 is provided for each of b, 11c, .... At the position opposite to this perforation 29, the perforation 2
A sensor 31 for detecting 9 is provided. The detection signal of the sensor 31 is sent to the microcomputer 32, where the feeding position of the photographic film 11 is detected.

The take-up spool 24 is rotated by the rotation of a motor 33 incorporated therein. This motor 3
3 is connected to the microcomputer 32 via a motor driver 34, and its rotation and rotation direction are controlled. The rotation of the motor 33 is transmitted to the spool fork 36 via the feed transmission device 35. The spool fork 36 is a spool 1 in the cartridge body 13.
Engage 2. The motor 33 is the photo film 11
When the film is wound on the take-up spool 24, it is driven in the normal direction,
Further, when it is rewound into the cartridge main body 13, it is driven in reverse.

The operation of the camera of the present invention constructed as above will be described. When the cartridge main body 13 is loaded into the cartridge chamber 22 and the back cover 26 is closed, the spool fork 3 is attached to the spool 12 stored in the cartridge main body 13.
6 is engaged. Further, the section 28 is sandwiched between the cartridge body 13 and the inner wall of the cartridge chamber 22,
The front surface and the back surface of 8 respectively contact the outer periphery of the cartridge body 13 and the inner wall of the cartridge chamber 22. At this time, since the slice 28 is thin and flexible, it follows the contour of the cartridge main body 13 and makes reliable contact.

The microcomputer 32 drives the motor 33 in the normal direction via the motor driver 34. The rotation of the motor 33 is transmitted to the spool fork 36 via the feeding / transmitting device 35, and the photographic film 11 is sent out from the cartridge main body 13 at high speed. At this time, the cartridge 12 and the spool 12 that rotates at a high speed, or the inner wall of the cartridge body 13 and the film surface of the photographic film 11 rub against each other to generate static electricity. However, the metal slice 28 is in contact with the outer periphery of the cartridge body 13,
Moreover, since the back surface side of the section 28 is in contact with the inner wall of the cartridge chamber 22, the generated static electricity is immediately grounded from the surface of the cartridge body 13 via the body portion 21 of the camera 20. Therefore, static electricity is not stored in the camera 20.

When the sensor 31 detects the perforation 29 corresponding to the first photographic frame and sends the detection signal to the microcomputer 32, the microcomputer 32 stops the driving of the motor 33 and the photographic film 1
Stop feeding 1. Then, the first frame of the photographic film 11 is set on the aperture 25, and the photographic film 11 is ready to be photographed.

When the photographic film 11 is exposed by the shutter release operation, the microcomputer 32
The motor 33 is driven in the normal direction to feed the photographic film 11 by one frame. Then, when the detection signal of the perforation 29 is input from the sensor 31, the microcomputer 32 stops the feeding of the photographic film 11. As a result, the next frame of the photo film 11 is set in the aperture 25. After this, the aperture 25
Every time the exposure is completed on the photographic frame set to, the one frame is similarly fed, and the next unexposed photographic frame is set in the aperture 25.

When the exposure of all the photographed frames of the photographic film 11 is completed, the microcomputer 32 drives the motor 33 in the reverse direction to execute the film rewinding operation. This film rewinding operation is to wind the exposed photographic film 11 into the cartridge main body 13 and is completed by stopping the driving of the motor 33 after a lapse of a fixed time after starting the driving of the motor 33. By this film rewinding operation, the photo film 11 wound on the take-up spool 24 is taken up on the spool 12 in the cartridge body 13 at high speed. At this time, the photo film 11
As in the case of sending out the film, the static electricity is generated by the friction between the cartridge main body 13 and the spool 12, or the inner wall of the cartridge main body 13 and the film surface of the photographic film 11, and this static electricity is generated.
It is immediately grounded via the main body portion 21 and is not stored in the camera 20.

When the rewinding of the photographic film 11 is completed, the back cover 26 of the camera 20 is opened and the photographic film cartridge 10 which has been taken is taken out. Then, if the photo film cartridge 10 is brought to a development handling shop and a DPE is requested, film development and print processing are performed, and a print photo can be obtained.

In the above embodiment, only one piece is provided in the patrone chamber, but if a plurality of pieces are provided so that each piece comes into contact with the outer periphery of the patrone body and the inner wall of the patrone chamber, electrostatic Therefore, the number of electric paths can be increased to more reliably prevent power storage.

FIGS. 5 and 6 show a second camera of the present invention.
An example is shown. The same members as those of the camera 20 shown in FIGS. 1 to 3 are designated by the same reference numerals. In this camera 40, the spool fork 41 that engages with the spool 12 is made of a conductive metal. A metallic brush 43 is provided in the cartridge chamber 42. The brush 43 is grounded and is arranged so as to contact the spool fork 41. According to this embodiment, static electricity generated by friction during film feeding is immediately grounded from the spool 12 via the spool fork 41 and the brush 43, and is not stored in the camera 40. Also,
In addition, the brush 43 is rotated by the rotation of the spool fork 41.
Even if vibration or shock is applied to the spool fork 4, the brush 43 flexibly entangles with the spool fork 41.
The contact between the brush 1 and the brush 43 does not come off, and the static electricity is reliably grounded.

In the second embodiment, the spool fork is made of metal. However, the spool fork may be made of a conductive material, so that the spool fork may be made of a conductive resin. The effect of is obtained.

In the camera of the first embodiment shown in FIG. 1, the spring portion 26a for pressing the cartridge body 13 from the back side into the cartridge chamber 22 is made of metal and grounded to remove static electricity. You may use. According to this, since the spring member for normalizing the posture of the cartridge body 13 can be used also as the static electricity removing member, it is not necessary to provide a special member.

[0024]

As described above, according to the present invention, an electrically conductive and grounded piece is attached to the inner wall of the cartridge chamber, and this piece is brought into contact with the cartridge body, so that the cartridge body is fed at the time of feeding the film. Static electricity generated by friction between the spool and the inner wall of the cartridge body and the film surface of the photographic film is immediately grounded from the cartridge body through the section and is not stored in the camera. Moreover, since the slice is thin and has flexibility, it follows the contour of the cartridge main body and makes sure contact. Therefore, it is possible to reliably prevent the accumulated static electricity from being discharged in the camera.

According to the second aspect of the invention, the spool fork that engages with the spool is made of metal or conductive resin, and a metallic brush is provided in the cartridge chamber so as to come into contact with the spool fork. Therefore, the static electricity generated by the friction during film feeding is
Immediately grounded via spool fork and brush. Also, even if vibration is applied by the rotation of the spool fork, the brush flexibly entangles with the spool fork, so
The contact between the spool fork and the brush does not come off, and static electricity can be reliably grounded.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a camera embodying the present invention.

2A and 2B are explanatory views of a main part showing an attached state of the section shown in FIG. 1, where FIG. 2A shows a state when the cartridge body is not loaded, and FIG. 2B shows a state when the cartridge body is loaded.

FIG. 3 is a schematic view showing a film feeding mechanism of the camera shown in FIG.

FIG. 4 is a cross-sectional view showing a photographic film cartridge.

FIG. 5 is a schematic view showing a second embodiment of the camera of the present invention.

6 is an explanatory view of a main part of the camera shown in FIG.

[Explanation of symbols]

 10 Photo film Patrone 11 Photo film 12 Spool 13 Patrone body 20,40 Camera 22,42 Patrone chamber 28 Section 41 Spool fork 43 Brush

Claims (6)

[Claims] 1. A camera that uses a photographic film cartridge in which a spool around which a belt-shaped photographic film is wound is housed in a cartridge body integrally molded of resin, in a cartridge chamber that houses the cartridge body.
A camera characterized in that an electrically conductive and grounded piece is provided and the piece and the main body of the cartridge are brought into contact with each other. 2. The section is made of a flexible thin metal plate,
The camera according to claim 1, wherein one end thereof is fixed to an inner wall of the cartridge chamber and the other end urges the cartridge body in a direction of pushing the cartridge body out of the cartridge chamber. 3. The section is made of a flexible thin metal plate,
The camera according to claim 1, wherein one end of the camera is attached to the case back and the other end presses the cartridge body into the cartridge chamber. 4. A plurality of the sections are provided, and each section is in contact with the cartridge body.
The camera according to claim 3. 5. A photo film patrone in which a spool around which a belt-shaped photo film is wound is housed in a patrone body integrally molded of resin, and a patrone chamber accommodating the patrone body and a spool engaged with the spool are provided. A camera having a rotating spool fork, wherein the spool fork is formed of metal, and a brush made of metal and grounded is provided in the cartridge chamber, and the brush and the spool fork are brought into contact with each other. . 6. A photo film patrone in which a spool around which a belt-shaped photo film is wound is housed in a patrone body integrally molded of resin, and a patrone chamber for accommodating the patrone body and a spool engaged with the spool are provided. In a camera having a rotating spool fork, the spool fork is formed of a conductive resin, a brush made of metal and grounded is provided in the cartridge chamber, and the brush and the spool fork are brought into contact with each other. A camera to do.