JPH08328103A - Camera - Google Patents

Abstract

PURPOSE: To prevent the influence of electromagnetic waves on a magnetic head in a camera. CONSTITUTION: In the camera having a magnetic head 12 for performing at least one of writing and reading of information to a magnetic memory part formed on a film, the magnetic head 12 is covered with a shielding member having magnetic shielding property. Further, in the camera having a pad member 17 arranged opposite to the magnetic head 12 to press the film onto the magnetic head 12 and a pad holding member 18 for holding the pad member 17 in a position opposed to the magnetic head 12, the shielding member constitutes at least a part of the pad holding member 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera provided with a magnetic head for writing and reading information to and from a magnetic storage portion formed on a film.

[0002]

2. Description of the Related Art A camera which uses a magnetic head to write and read information relating to photographing in a magnetic storage portion of a film is disclosed in US Pat. No. 4,864,332 and the like. Further, even when the film vibrates in the thickness direction during the feeding of the film, the present applicant has various structures for moving the magnetic head following the vibration and accurately writing information to the magnetic storage unit. is suggesting.

By the way, since electromagnetic waves are generated from the motor for feeding the film, for example, when an electric circuit for amplifying an output signal from the magnetic head and the motor are arranged close to each other. As a result, a noise signal is generated in the electric circuit, which makes it impossible to accurately write information in the magnetic storage unit. For this reason, Japanese Patent Laid-Open No. 4-32086 proposes a structure in which the electric circuit is covered with a member having a magnetic shield property.

[0004]

However, as miniaturization of the camera progresses in recent years, the motor and the magnetic head, which have been arranged relatively far apart until then, must be arranged close to each other. Therefore, there is a problem that the magnetic head itself is affected by the electromagnetic wave.

In addition to the motor, the camera also has electric parts (for example, a transformer of a DC / DC converter and a coil in a strobe circuit) that generate electromagnetic waves. Electromagnetic waves come in. However, with respect to cameras, measures against these electromagnetic waves have not been conventionally taken.

Therefore, a first object of the present invention is to provide a camera capable of preventing the influence of electromagnetic waves on the magnetic head.

A second object of the present invention is to provide a camera capable of preventing the influence of electromagnetic waves on the magnetic head without increasing the number of parts.

Further, a third object of the present invention is to provide a camera in which a shield member can be easily attached.

A fourth object of the present invention is to provide a camera in which a shield member can be easily attached without lowering the strength of the camera body.

[0010]

In order to achieve the above object, the first invention of the present application has a magnetic head for writing and / or reading information to / from a magnetic storage portion formed on a film. In the camera, the magnetic head is covered with a shield member having a magnetic shield property.

According to this, electromagnetic waves do not affect the magnetic head itself, and it is possible to accurately write information in the information storage section without generating noise.

According to the second aspect of the present invention, a pad member that is arranged so as to face the magnetic head and presses the film against the magnetic head, and a pad holding member that holds the pad member at a position facing the magnetic head. In the camera having the above, the shield member constitutes at least a part of the pad holding member.

According to this, in the camera using the pad holding member in the related art, the magnetic shield of the magnetic head can be performed without adding a new component dedicated to the shield, and the size of the camera can be reduced. You can

If a portion of the pad holding member facing the head surface of the magnetic head is used as a shield member, electromagnetic waves entering from the front of the head surface can be reliably shielded, and the pad holding member can be securely shielded. If a portion of the magnetic head that faces the surface other than the head surface is used as a shield member, it is possible to reliably shield electromagnetic waves that enter from above or below or from the side of the magnetic head.

In the third invention of the present application, the shield member is attached to the surface of the camera body on the back side of the attachment surface of the pad member.

According to this, even when the pad member is directly attached to the camera body, the shield member can be easily arranged at an appropriate position (a position facing the magnetic head with the pad member sandwiched therebetween).

Further, in the fourth invention of the present application, a shield member is insert-molded in a portion of the camera body facing the head surface of the magnetic head.

According to this, since the work of attaching the shield member to the camera body and the processing such as drilling for attaching the shield member to the camera body are not required, the manufacture is facilitated and the strength of the camera body is improved. Does not need to be lowered.

In the third and fourth aspects of the invention, it is desirable that the shield member be provided with a surface facing the head surface of the magnetic head and a surface facing the surface of the magnetic head other than the head surface.

According to this, it is possible to obtain a reliable magnetic shield effect with respect to an electromagnetic wave received from the front of the head surface and an electromagnetic wave received from a direction other than the head surface.

According to the fifth aspect of the present invention, in a camera having a magnetic head for writing and / or reading information to / from a magnetic storage section formed on a film, and a shutter unit attached to the camera body, a shutter is provided. A member having a magnetic shield property for the magnetic head is used for the unit.

According to this, for example, the cover plate attached to the rear surface of the shutter unit is made of a magnetic shield material, so that the magnetic head can be magnetically shielded without adding a new component dedicated to the shield.

In the camera using the fifth aspect of the invention, it is desirable to dispose the magnetic head and the electric parts other than the magnetic head with the shutter unit interposed therebetween. According to this, it is possible to obtain a shielding effect not only for electromagnetic waves entering from the outside but also for electromagnetic waves generated from electric parts inside the camera.

[0024]

【Example】

(First Embodiment) FIGS. 1 to 3 show a camera according to a first embodiment of the present invention. In these figures, 1 is a film cartridge in which the film 1a is wound and stored,
Reference numeral 2 is a camera body having openings 2a and 2b, and 3 is a cartridge chamber in which the film cartridge 1 is loaded. Further, 4 is a take-up spool for taking up the film 1 a pushed out from the film cartridge 1, and 5 is a spool chamber for accommodating the take-up spool 4.
An aperture opening 6 is formed in the plate-shaped portion of the camera body 2 which is sandwiched between the cartridge chamber 3 and the spool chamber 5.
Are formed. 7 and 8 in this plate-shaped portion are inner rails that guide the film 1a in the feeding direction, and 9 and 10 are outer rails to which a pressure plate 15 is attached to form a film feeding passage.

Reference numeral 11 is a film feeding motor arranged in the take-up spool 4, and 12 is a magnetic head for writing and reading information to and from the magnetic storage portion of the film 1a incorporated in the film cartridge 1. Yes, 13 is a head holder for holding the magnetic head 12. The magnetic head 12 is adhered and fixed to the vertical bending portions 13 a and 13 b formed on the upper portion of the head holder 13. Bearing portions 13c and 13d are formed in the lower portion of the head holder 13, and the head holder 13 passes the shaft 14 through the bearing portions 13c and 13d and the bearing portions 15a and 15b formed on the pressure plate 15, It is attached to the pressure plate 15 so as to be swingable in the front-rear direction.

A pressure plate 15 is fixed to the camera body 2 (end surfaces of the outer rails 9 and 10) with screws. As a result, a film feeding passage for feeding the film 1a is formed between the plate-shaped portion of the camera body 2 and the pressure plate 15. Reference numeral 16 denotes a pressing spring attached to the shaft 14, and the head holder 13 has the pressing spring 16
Is urged forward by. A notch is formed in the upper portion of the pressure plate 15, and the magnetic head 12 biased forward together with the head holder 13 can project into the film feeding passage through the notch.

Reference numeral 17 is a pad formed of an elastic material such as rubber, and is used to bring the film 1 into close contact with the head surface of the magnetic head 12. Reference numeral 18 denotes a pad holder, which includes a fixed portion 18a extending in the vertical direction and the horizontal direction (film feeding direction), and a vertical bending portion 18 extending rearward (that is, in the direction of the pressure plate 15) from the upper end of the fixed portion 18a.
b and. Then, in the fixed portion 18a,
The pad 17 is adhered and fixed.

Here, the pad holder 18 is formed of a material having a magnetic shield property such as silicon steel or permalloy, that is, a material having a high relative magnetic permeability.

In the pad holder 18, the fixing portion 18a is screwed or adhered to the front surface of the plate-shaped portion of the camera body 2 (on the side where the photographing lens is attached), so that the camera body 2 is fixed.
Fixed to. As a result, the fixed portion 18a faces the head surface of the magnetic head 12 with the plate-shaped portion in between and covers the head surface. Then, as shown in FIG. 3, the magnetic head 12 and the film feeding motor 1 are sandwiched by the fixing portion 18a.
It becomes the form where 1 and are located.

Two through openings 2a and 2b are formed in the upper portion of the plate-shaped portion. When the fixing portion 18a is attached to the front side of the plate-shaped portion, the pad 17 is used for film feeding through the opening 2a. While protruding into the passage, the upright bent portion 18b of the pad holder 18 projects through the opening 2b to the back side of the plate-like portion and covers the upper surface of the upper surface of the magnetic head 12.

According to the present embodiment, the magnetic head 12 is magnetically shielded against the electromagnetic waves generated from the film feeding motor 11 by the fixed portion 18a of the pad holder 18. Here, as can be seen from FIG. 3, the magnetic head 12 and the film feeding motor 11 are not arranged to face each other directly in front, but the film feeding motor 11 is arranged diagonally to the right front of the magnetic head 12. . Therefore, in order to improve the magnetic shield effect on the film feeding motor 11, it is desirable to extend the fixing portion 18a of the pad holder 18 to the right of the right end of the magnetic head 12 to some extent. Further, the magnetic head 12 is the camera body 2
The vertical bending portion 18b of the pad holder 18 shields electromagnetic waves generated from a transformer (not shown) of a DC / DC converter arranged above the coil, a coil (not shown) of a strobe circuit, and the like.

Further, the magnetic head 12 is shielded by the pad holder 18 against not only electromagnetic waves generated in the camera but also electromagnetic waves entering the camera from the outside of the camera.

Therefore, the magnetic head 12 is not affected by noise due to these electromagnetic waves, and the film 1a is not affected.
It is possible to accurately write information to and read information from the magnetic storage unit.

Further, in this embodiment, the pad holder 1
Since 8 also serves as a shield member, the number of parts can be reduced as compared with the case where the pad holder and the member dedicated to the magnetic shield are separate members, and the number of assembling steps need not be increased. The camera can be made compact.

(Second Embodiment) FIGS. 4 to 6 show a camera according to a second embodiment of the present invention. This camera is the first
The camera has substantially the same configuration as that of the camera described in the embodiment, and the same portions will be denoted by the same reference numerals as in FIGS. However, in the camera of the second embodiment, the pad holder 18 is not used, and the pad 17 is directly fixed to the back surface of the plate-shaped portion of the camera body 2. Then, in this camera, a shield plate 19 formed of a material having a magnetic shield property is used. The shield plate 19 includes a fixed portion 19a extending in the vertical direction and the horizontal direction (film feeding direction), and a vertical bending portion 19b extending from the upper portion of the fixed portion 19a to the rear (direction of the pressure plate 15). . The shield plate 19 is attached to the camera body 2 by fastening or fixing the fixing portion 19a to the front surface of the plate-shaped portion. As a result, the fixed portion 19a faces the head surface of the magnetic head 12 with the plate-shaped portion in between and covers the head surface. Then, as shown in FIG. 6, the magnetic head 12 and the film feeding motor 11 are positioned so as to sandwich the fixing portion 19a. Further, the upright bent portion 19b projects to the back side through the through opening 2a formed in the upper portion of the plate-shaped portion and covers the upper surface of the magnetic head 12.

Also in this embodiment, as in the first embodiment, the magnetic head 12 is fixed to the fixed portion 19a of the shield plate 19 against the electromagnetic wave generated from the film feeding motor 11.
Magnetically shielded by. Here, as can be seen clearly from FIG. 6, since the film feeding motor 11 is arranged diagonally to the right front of the magnetic head 12, in order to enhance the magnetic shield effect on the film feeding motor 11,
It is desirable to extend the fixed portion 19a to the right of the right end of the magnetic head 12 to some extent. In addition, the magnetic head 12
Is an electromagnetic wave generated from a transformer or a coil (none of which is shown) arranged above the camera body 2,
It is shielded by the vertical bending portion 19b of the shield plate 19.

Further, the magnetic head 12 is shielded by the shield plate 19 against not only the electromagnetic waves generated in the camera but also the electromagnetic waves entering the camera from the outside of the camera.

Therefore, the magnetic head 12 is not affected by noise due to these electromagnetic waves, and the film 1a is not affected.
It is possible to accurately write information to and read information from the magnetic storage unit.

(Third Embodiment) FIGS. 7 to 9 show a camera according to a third embodiment of the present invention. This camera is the first
The camera has substantially the same configuration as that of the camera described in the embodiment, and the same portions will be denoted by the same reference numerals as in FIGS. However, in the camera of the third embodiment, the pad holder 18 is not used, and the pad 17 is directly fixed to the back surface of the plate-shaped portion of the camera body 2. Then, in this camera, a shield plate 20 formed of a material having a magnetic shield property is used. The shield plate 20 is composed of a fixed portion 20a extending in the vertical direction and the horizontal direction (film feeding direction), and a vertical bending portion 20b extending from the upper portion of the fixed portion 20a rearward (toward the pressure plate 15). . The shield plate 20 is insert-molded into the camera body 2 so that the base ends of the fixed portion 20a and the vertical bending portion 20b are embedded in the plate-shaped portion. However, the front surface of the fixed portion 20a is exposed to the outer surface of the camera body 2. As a result, the fixed portion 20a faces the head surface of the magnetic head 12 with the plate-shaped portion in between and covers the head surface. Then, as shown in FIG. 9, the magnetic head 12 and the film feeding motor 11 are positioned so as to sandwich the fixing portion 20a. The upright bent portion 20b projects from the upper portion of the plate-shaped portion to the back side and covers the upper surface of the magnetic head 12.

Also in this embodiment, as in the first embodiment, the magnetic head 12 is fixed to the fixed portion 20a of the shield plate 20 against the electromagnetic wave generated from the film feeding motor 11.
Magnetically shielded by. Here, as can be seen clearly from FIG. 9, since the film feeding motor 11 is arranged diagonally to the right front of the magnetic head 12, in order to improve the magnetic shield effect on the film feeding motor 11,
It is desirable to extend the fixed portion 20a to the right of the right end of the magnetic head 12 to some extent. In addition, the magnetic head 12
Is an electromagnetic wave generated from a transformer or a coil (none of which is shown) arranged above the camera body 2,
It is shielded by the vertical bending portion 20b of the shield plate 20.

Further, the magnetic head 12 is shielded by the shield plate 20 against not only the electromagnetic waves generated inside the camera but also the electromagnetic waves entering the camera from the outside of the camera.

Therefore, the magnetic head 12 is not affected by noise due to these electromagnetic waves, and the film 1a is not affected.
It is possible to accurately write information to and read information from the magnetic storage unit.

Furthermore, in this embodiment, since the shield plate 20 is insert-molded in the camera body 2, the through openings 2a and 2b in the first embodiment are provided, and the shield plate 18 is screwed or adhered to the camera body 2. You don't have to. For this reason, the manufacture is facilitated, and the strength of the camera body 2 is not reduced.

(Fourth Embodiment) FIGS. 10 and 11 show
9 shows a camera according to a fourth embodiment of the present invention. This camera has substantially the same configuration as the camera described in the first embodiment, and the same portions are denoted by the same reference numerals as those in FIGS. 1 and 3 and will not be described. However, in the camera of the fourth embodiment, the pad holder 18 is not used, and the pad 17 is directly fixed to the back surface of the plate-shaped portion of the camera body 2. Reference numeral 21 is a focal plane shutter unit, and 22 is this shutter unit 2
Covering the mechanism such as shutter blades built in 1,
It is a cover plate attached to the back surface of this shutter unit. The cover plate 22 is formed of a material having a magnetic shield property and has substantially the same shape as the plate-shaped portion of the camera body 2. Then, the shutter unit 21 to which the cover plate 22 is attached
Is fixed to the front surface of the plate-shaped portion of the camera body 2. As a result, the cover plate 22 faces the head surface of the magnetic head 12 with the plate-shaped portion in between and covers the head surface. Then, as shown in FIG. 11, the magnetic head 12 and the film feeding motor 11 are positioned with the shutter unit 21 (that is, the cover plate 22) interposed therebetween.

In this embodiment, the magnetic head 12 is
For electromagnetic waves generated from the film feeding motor 11,
It is magnetically shielded by the cover plate 22.
Furthermore, not only the electromagnetic waves generated in the camera,
The magnetic head 12 is also shielded by the cover plate 22 against electromagnetic waves that enter the camera from the front of the outside of the camera. Therefore, the magnetic head 1
2 can perform accurate writing of information to and reading of information from the magnetic storage portion of the film 1a without being affected by noise due to these electromagnetic waves.

Further, in this embodiment, since the cover plate 22 which is a part of the shutter unit 21 also serves as a shield member, it is not necessary to add a new part dedicated to the shield. Therefore, it is possible to suppress an increase in the number of parts and the number of assembling steps, and it is possible to make the camera compact.

Although the cover plate 22 that covers the back surface of the shutter unit 21 is made of a magnetic shield material in this embodiment, the present invention is not limited to this, and, for example, shutter blades in the shutter unit 21 may be used. May be formed of a magnetic shield material.

Although the focal plane shutter unit is used as the shutter unit in the present embodiment, the shutter unit used in the present invention is not limited to this.

The present invention can also be applied to image recording media other than films.

The present invention also relates to a cartridge other than the film cartridge described in the above embodiments, a cartridge having an image recording medium other than film, and a cartridge other than the film cartridge or a cartridge such as a battery. It is applicable even if it is a thing.

Furthermore, the present invention may use the above-described embodiments and modifications, or the technical elements thereof in combination as necessary.

Moreover, the present invention is applicable to various types of cameras such as a single-lens reflex camera, a lens shutter camera, a video camera, optical devices other than the camera, and other devices, and those cameras, optical devices and other devices. The present invention can also be applied to devices applied to the above or elements constituting these devices.

(Relationship Between Embodiments and Claims) The pad holder 18 and the shield plates 19 and 20 in the first to third embodiments correspond to the shield members in claims 1 to 8. In addition, the pad holder 18 in the first embodiment
Corresponds to the pad holding member according to claims 2 to 4. Further, the pad holder 18 and the fixing portions 18a, 19a, 20 of the shield plates 19, 20 in the first to third embodiments.
“A” corresponds to “a surface facing the head surface of the magnetic head” in claims 3, 6, and 8, and the upright bent portion 1 in the embodiment.
Reference numerals 8b, 19b, 20b correspond to "a surface facing a surface other than the head surface of the magnetic head" according to claims 4, 6, and 8.

Further, the cover plate 22 in the fourth embodiment corresponds to "a member having a magnetic shield property for the magnetic head" in claim 9, and the film feeding motor 11 in the embodiment is in claim. This corresponds to “electrical components other than the magnetic head” described in 10.

The above is the correspondence relationship between each configuration of the present invention and each configuration of the embodiments, but the present invention is not limited to the configurations of these embodiments, and the mechanism or the embodiment shown in the claims is not limited. Any structure may be used as long as the function of the structure can be achieved.

[0056]

As described above, in the first invention of the present application, the magnetic head is covered with the shield member having the magnetic shield property. Therefore, according to the present invention, the electromagnetic wave does not affect the magnetic head itself, the generation of noise can be suppressed, and information can be accurately written in the magnetic storage section.

Further, in the second invention of the present application, at least a part of the pad holding member for holding the pad member at a position facing the magnetic head is used as the shield member. Therefore, according to the present invention, in the camera using the pad holding member in the related art, the magnetic head can be magnetically shielded without newly adding a component dedicated to the shield, and the size of the camera can be reduced. be able to.

By using a portion of the pad holding member facing the head surface of the magnetic head as a shield member, it is possible to reliably shield an electromagnetic wave entering from the front of the head surface, and also the pad holding member. If a portion of the magnetic head that faces the surface other than the head surface is used as a shield member, it is possible to reliably shield electromagnetic waves that enter from above or below or from the side of the magnetic head.

In the third invention of the present application, the shield member is attached to the back surface of the attachment surface of the pad member in the camera body. Therefore, according to the present invention, even when the pad member is directly attached to the camera body,
The shield member can be easily arranged at an appropriate position (that is, a position facing the magnetic head with the pad member sandwiched therebetween).

Further, in the fourth invention of the present application, the shield member is insert-molded in the portion of the camera body facing the head surface of the magnetic head. Therefore, according to the present invention, the work of attaching the shield member to the camera body,
Since processing such as drilling for attaching the shield member to the camera body is not necessary, manufacturing is facilitated and the strength of the camera body is not reduced.

If the shield member is provided with a surface facing the head surface of the magnetic head and a surface facing the surface of the magnetic head other than the head surface, electromagnetic waves received from the front of the head surface are It is possible to obtain a reliable electromagnetic shield effect even for an electromagnetic wave received from a direction facing a surface other than the head surface.

Further, in the fifth aspect of the present invention, the shutter unit is made of a member having a magnetic shield property for the magnetic head. Therefore, according to the present invention, the magnetic head can be shielded without adding a new component dedicated to shielding.

If the magnetic head and electric parts other than the magnetic head are arranged with the shutter unit interposed therebetween,
It is possible to obtain a shielding effect not only for electromagnetic waves that enter from the outside of the camera but also for electromagnetic waves that are generated from electric parts inside the camera.

[Brief description of drawings]

FIG. 1 is a perspective view showing a main configuration of a camera according to a first embodiment of the present invention.

FIG. 2 is a side sectional view of the camera of FIG.

FIG. 3 is a plan sectional view of the camera of FIG.

FIG. 4 is a perspective view showing a main configuration of a camera of a second embodiment of the present invention.

5 is a side sectional view of the camera of FIG.

6 is a plan sectional view of the camera of FIG.

FIG. 7 is a perspective view showing a main configuration of a camera of a third embodiment of the present invention.

FIG. 8 is a side sectional view of the camera of FIG.

9 is a plan sectional view of the camera of FIG.

FIG. 10 is a perspective view showing a main configuration of a camera of a fourth embodiment of the present invention.

11 is a plan sectional view of the camera of FIG.

[Explanation of symbols]

 1 Film Cartridge 2 Camera Body 11 Film Feed Motor 12 Magnetic Head 15 Pressure Plate 17 Pad 18 Pad Holder 19, 20 Shield Plate 21 Focal Plane Shutter Unit 22 Cover Plate

Claims (10)

[Claims] 1. A camera having a magnetic head for writing and / or reading information to / from a magnetic storage portion formed on a film, wherein the magnetic head is covered with a shield member having a magnetic shield property. And the camera. 2. A pad member, which is arranged so as to face the magnetic head and presses the film against the magnetic head,
A pad holding member for holding the pad member at a position facing the magnetic head, and the shield member constitutes at least a part of the pad holding member. The camera described in. 3. The camera according to claim 2, wherein the shield member constitutes a portion of the pad holding member facing the head surface of the magnetic head. 4. The camera according to claim 2, wherein the shield member constitutes a portion of the pad holding member that faces a surface of the magnetic head other than the head surface. 5. A pad member, which is arranged to face the magnetic head and presses the film against the magnetic head,
The camera according to claim 1, wherein the camera is attached to a camera body, and the shield member is attached to a surface of the camera body on a side opposite to an attachment surface of the pad member. 6. The shield member according to claim 5, wherein the shield member has a surface facing a head surface of the magnetic head and a surface facing a surface of the magnetic head other than the head surface. camera. 7. The camera according to claim 1, wherein the shield member is insert-molded in a portion of the camera body facing the head surface of the magnetic head. 8. The shield member according to claim 7, wherein the shield member has a surface facing a head surface of the magnetic head and a surface facing a surface of the magnetic head other than the head surface. camera. 9. A camera having a magnetic head for writing and / or reading information to and from a magnetic storage portion formed on a film, and a shutter unit attached to a camera body, wherein the magnetic head is provided in the shutter unit. A camera characterized by using a member having a magnetic shield property with respect to. 10. The camera according to claim 9, wherein the magnetic head and electric parts other than the magnetic head are arranged with the shutter unit interposed therebetween.