JPH1096993A - camera - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To reduce the influence of external noise and noise from a motor in a spool. A film with a magnetic recording part, comprising a magnetic head for writing or reading information magnetically to or from a magnetic recording part of the film, wherein a motor is arranged inside a take-up spool of the film. Is characterized in that the spool chamber is formed of a magnetic material and has a magnetic shielding effect.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera using a film with a magnetic recording section in which a motor is disposed inside a film take-up spool.

[0002]

2. Description of the Related Art A camera in which a motor is disposed inside a take-up spool and which uses a film having a magnetic recording portion has been proposed. In a camera using a film with a magnetic recording section, the magnetic recording section of the film is provided with a magnetic head for recording various information at the time of photographing or reproducing information from the magnetic recording section of the film. Some cameras have an intermediate film exchange function that detects and sets unexposed frames when a film cartridge that has been partially photographed is reloaded into the camera using this function. Therefore, when the magnetic flux generated when the motor is rotated leaks from the motor, the magnetic head is configured so as not to adversely affect the recording or reproducing operation of the magnetic head, the magnetic flux generated by the motor in the camera, and the magnetic flux coming from the outside. There has been proposed one configured to protect a magnetic recording portion of a film from a magnetic flux.

Japanese Patent Laying-Open No. 4-26832 proposes a magnetic head that is not affected by the noise of a film feeding motor.

[0004] The motor itself is shielded by mounting a shield case from the side opposite to the output shaft of the motor disposed inside the take-up spool so that motor noise does not leak.

[0005] Next, as a construction for protecting a magnetic recording portion of a film by a motor in a camera or an external magnetic field, for example, Japanese Utility Model Laid-Open No. 6-28850 has been proposed. In this proposal, the back cover and the film cartridge for accommodating the film are formed of a magnetic shielding material made of a magnetic material to protect magnetic information of a magnetic recording unit provided on the film.

Further, the camera proposed in Japanese Patent Laid-Open No. 6-332064 discloses a camera in which a film take-up spool is formed from a molding material to which a magnetic powder is added, or a magnetic material plating is applied to the inner peripheral surface of the film take-up spool. Is applied so that the magnetic flux leakage of the motor arranged in the spool does not affect the magnetic recording portion of the film wound on the take-up spool.

[0007]

However, of the above conventional examples, Japanese Patent Application Laid-Open Nos. Hei 4-26832 and Hei 6-33
In No. 2064, the adverse effect of the motor, which is a noise source, can be effectively reduced, but it is effective. In particular, it is required to remove the influence of noise on writing or reading by the magnetic head, not the influence of noise on the magnetic recording information itself of the film.

In Japanese Unexamined Utility Model Publication No. Hei 6-28850, the back cover and the film cartridge itself are shielded to prevent external noise, but the most problematic effect of the motor noise in the spool on the magnetic head is described. It will be weak.

[0009]

According to the first aspect of the present invention, there is provided a magnetic head for writing or reading magnetic information to or from a magnetic recording portion of a film, and a motor is disposed inside a take-up spool of the film. A camera using a film with a magnetic recording portion is characterized in that the spool chamber is formed of a magnetic material and has a magnetic shielding effect.

The invention according to claim 2 is characterized in that the spool chamber itself is formed of a magnetic material.

The invention according to claim 3 is characterized in that the camera has a magnetic material layer formed on the inner wall of the spool chamber.

According to a fourth aspect of the present invention, there is provided a camera wherein the take-up spool is also made of a magnetic material.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) FIG. 1 is a drawing that best illustrates the features of the present embodiment. In FIG.
1a is a film cartridge chamber in which the film cartridge 10 is loaded, 1b is a photographing screen frame (aperture), 1
c is an inner rail for forming a film feeding space (tunnel) with a film guide member (not shown), 1d is an outer rail for guiding the vertical movement of the film, and 1e is a film wound by the winding spool 3. Is a roller chamber, and 1f is a roller receiving portion.

Reference numeral 2 denotes a film feeding motor, and a pinion 2a is attached to a central output shaft. The rotation of the pinion 2a is a driving source for winding and rewinding the film by a known driving system.

Reference numeral 3 denotes a spool for winding up the film, 4 denotes a spool rubber attached to the surface of the spool 3, 5 denotes a spool gear, and 6 denotes a magnetic recording or reproducing magnetic recording portion (upper or lower region of the film) of the film. The head is held against the film guide member so as to be able to contact the magnetic recording portion of the film (in this case, the lower region of the film). Reference numeral 7 denotes a magnetic shield plate attached to the inner wall of the spool chamber of the camera body 1, which is formed of a magnetic material (permalloy, silicon steel plate, or the like). Reference numeral 8 denotes a back roller which has a roller rotatably attached to one end, and a rear roller which is fixed to a film guide member (not shown) at the other end, and spools the film sent out of the film cartridge 10 and beyond the photographing screen frame 1b. It works to push in the direction. Reference numeral 9 denotes a main body roller having a roller rotatably mounted at one end, and the other end fixed to a roller receiving portion 1f of the camera main body 1, which winds the film bent in the spool direction by the back roller 8 around the spool. do. Reference numeral 10 denotes a film cartridge containing a film with a magnetic recording unit.

FIG. 2 is a detailed exploded perspective view of the take-up spool in the present embodiment. The spool 3 itself is formed of a magnetic material (permalloy, etc.) to shield magnetic flux generated by the motor 2, and has a flange 3 for regulating the position of the spool rubber 4 at one end of the cylindrical shape.
d is formed, and claw portions 3a, 3b, 3c for transmitting rotation of the spool gear 5 to the spool 3 are formed at the other end. The film 4 is attached to the outer periphery of the spool 3 and integrated, and the film pressed by the spool rubber 4 is wound up by the friction of the rubber by the back roller and the body roller.
5 is a pinion gear 2a provided on the output shaft of the motor 2.
Is a spool gear driven through a reduction gear train (not shown) by the rotation of. In order to transmit the rotation of the spool gear 5 to the spool 3, grooves 5 a, 5 b, 5 c fitted into the claw portions 3 a, 3 b, 3 c of the spool 3 are provided on the spool gear 5.
Is provided.

FIG. 3 is a vertical sectional view of the spool of the camera according to the present embodiment. The motor 2 is fixed to a motor ground plate (not shown), and is arranged inside the spool 3 with a gap from the spool 3.

FIG. 4 is a cross-sectional view around the spool chamber of the camera according to the present embodiment. A magnetic material layer is formed by attaching a magnetic material to an inner wall of a U-shaped portion of the spool chamber 1e for storing a spool. This is to prevent the magnetic flux of the motor further leaking from the spool 3 made of a magnetic material from affecting the magnetic head.
It serves to conduct magnetic flux in the direction opposite to that of the magnetic head.
The back roller 8 and the main body roller 9 are biased and held toward the spool.

As described above, the present embodiment has a function of replacing the film in which the film which has been photographed halfway is reloaded into the camera, the magnetic information of the photographed frame is detected, and the unexposed frame is set. In particular, in a camera in which a motor is disposed in a spool, the spool itself is formed of a magnetic material (a material having a high saturation magnetic flux density) to form a magnetic shield.

Further, by attaching a magnetic material to the inner wall of the spool chamber as well, magnetic flux leaking from the spool and external noise from the environment outside the camera are used as a magnetic shield. As a result, it is possible to prevent the magnetic head from being adversely affected by a motor or a magnetic flux from outside during the operation of the intermediate film exchange function.

(Second Embodiment) FIG. 5 shows a second embodiment of the present invention. The second embodiment also has the same spool configuration as the first embodiment described above, and a spool rubber 4 is attached to a spool 3 formed of a magnetic material.

In the present embodiment, as shown, the spool chamber 11 itself is formed of a magnetic material.

The joining of the camera body and the spool chamber 11 except for the spool chamber is performed by bonding or insert molding.

Further, the rear roller 1 is provided in the spool chamber 11.
2. The attachment of the main body roller 13 not only enhances the magnetic shielding effect but also contributes to downsizing of the camera.

As described above, according to the second embodiment,
It has the same effect as the first embodiment described above, and reloads a film taken partway into the camera, detects magnetic information of the taken frame, and sets an unexposed frame. A camera having a function and having a motor disposed in the spool can also provide a magnetic shielding effect such as a magnetic flux leaking from the spool and external noise from an environment outside the camera.

This can reduce the adverse effect on the magnetic head due to the motor and external magnetic flux during the operation of the mid-film changing function.

Further, in a spool chamber formed of a magnetic material,
By attaching the back roller and main body roller directly,
The camera can be downsized.

[0028]

According to the camera described in the first aspect, a magnetic shielding effect of noise and extraneous noise by the motor in the spool can be achieved. To reduce the adverse effect of external noise on the magnetic recording of the film wound on the spool,
A magnetic shielding effect on the operation of the magnetic head due to the noise of the motor in the spool can also be obtained.

According to the camera of the second or third aspect, the structure of the spool chamber that achieves the magnetic shielding effect can be easily provided.

In the camera according to the fourth aspect, a stronger magnetic shielding effect can be obtained by magnetically shielding the take-up spool itself.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a camera according to a first embodiment of the present invention.

FIG. 2 is a detailed exploded perspective view of a spool of the camera of FIG. 1;

FIG. 3 is a longitudinal sectional view of a spool of the camera of FIG. 1;

FIG. 4 is a cross-sectional view around a spool chamber of the camera according to the first embodiment.

FIG. 5 is a cross-sectional view around a spool chamber of a camera according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Camera main body 1a Cartridge chamber 1b Photographing screen frame 1c Inner rail 1d Outer rail 1e Spool chamber 1f Roller receiving part 2 Motor 3 Spool 5 Spool gear 6 Magnetic head 7 Magnetic shield plate 8 Back roller 9 Body roller 10 Film cartridge

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI G03C 3/00 585 G03C 3/00 585D

Claims (4)

[Claims] 1. A camera using a film with a magnetic recording section, which has a magnetic head for writing or reading information by magnetism to or from a magnetic recording section of the film, and a motor disposed inside a winding spool of the film. A camera characterized in that the spool chamber is made of a magnetic material and has a magnetic shielding effect. 2. The camera according to claim 1, wherein said spool chamber is formed of a magnetic material. 3. The camera according to claim 1, wherein said spool chamber has a magnetic material layer formed on an inner wall thereof. 4. The camera according to claim 1, wherein said take-up spool is also made of a magnetic material.