JPH1138498A - Device applied to film with magnetic recording member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a device whose constitution is small-sized and where the influence of the magnetic noises of a motor or the like to a magnetic head, specially a leaked magnetic flux on a terminal side is effectively eliminated by having a magnetic shielding member provided at a constituent member which is opposed to the terminal of the motor and is not directly related to the motor. SOLUTION: This device possesses the magnetic head 11 reading information from the magnetic recording part of film, the motor 5 and the magnetic shielding member 17 provided at the constituent member that is opposed to the terminal of the motor 5 and is not directly related to the motor 5. The magnetic shielding member 17 constituted of a high magnetically permeable magnetic material is used at a part of the battery chamber 15 of the camera being the constituent member that is opposed to the terminal of the motor 5 for feeding the film and is not directly related to the motor 5 for feeding the film at this device. Thus, a magnetic flux leaking from the terminal side of the motor 5 is directed to the magnetic head 11 by performing an action as magnetic shielding for the terminal side of the motor 5, so that a noise magnetic flux leaking from the motor 5 for feeding the film is shielded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus such as a camera applied to a film with a magnetic recording section, and more particularly to a measure against magnetic noise for the magnetic head.

[0002]

2. Description of the Related Art A camera system has been proposed in which a magnetic layer is provided on a film, and photographic information of a camera is magnetically recorded on the magnetic layer and reproduced. By detecting the presence or absence of the information of the magnetic recording unit, the unexposed film (new) or during the shooting,
There are also cameras that identify a photographed image and have a function of changing the film halfway. The camera having the function of changing the film midway needs to detect a signal from a magnetic layer of the film having a lower magnetic density than a normal magnetic tape for music, and it is necessary to detect noise (electromagnetic field fluctuation of electromagnetic components in the camera and noise). It is important to take measures to prevent the mixing of external noise). In particular, in the case of a camera, since the distance between the DC motor for feeding the film and the magnetic head cannot be sufficiently separated, it is urgently necessary to reduce noise induced to the magnetic head by the DC motor for feeding the film. .

For example, Japanese Patent Application Laid-Open No. Hei 5-34798 discloses a feature that a film feeding motor is shielded with a high magnetic permeability magnetic material such as permalloy as a magnetic shielding means of a camera using a film with a magnetic recording portion. And

Japanese Unexamined Patent Publication No. 7-209733 discloses a camera in which a film feeding motor is disposed in a film take-up spool, and in order to obtain a sufficient shielding effect, a motor noise shield is required. The film take-up spool is formed of a high-permeability magnetic material, and a high-permeability magnetic material having a curved surface substantially equal to the radius of curvature of the recording surface is arranged opposite to the recording surface of the magnetic head on the noise receiving side. I have.

Further, Japanese Patent Application Laid-Open No. 7-199328 discloses that a head is arranged on the side opposite to the terminal side (brush side) of the film feed motor.

[0006]

However, in the camera disclosed in Japanese Patent Application Laid-Open No. Hei 5-34798, in order to perform sufficient magnetic shielding, a shield member made of a high magnetic permeability magnetic material such as permalloy is wound many times. It is necessary to further increase the outer diameter of the winding spool disposed on the outer periphery. Conversely, when the magnetic shield is weakened and the spool diameter is reduced, the distance between the magnetic head and the hoisting motor must be increased.

In any case, reducing the noise induced to the head by the motor only in the take-up spool leads to an increase in the size of the camera.

In the camera disclosed in Japanese Patent Application Laid-Open No. 7-209733, it is effective to dispose a magnetic shield in front of the magnetic head. It is difficult to conform to the above because the film is hard.

In the camera disclosed in Japanese Patent Application Laid-Open No. 7-199328, the film feed DC motor has a plastic cap at the terminal, so that the amount of noise generated is larger than that of the output shaft side. Although the head is arranged on the side opposite to the terminal side (brush side) of the feed motor, it may not be possible due to the layout of the camera, and even if it is arranged on the opposite side considering the miniaturization of the camera. I can't earn much distance.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a camera which is applied to a film having a magnetic recording portion and which can effectively remove the influence of magnetic noise of a motor or the like on a magnetic head, particularly, a leakage magnetic flux on a terminal side thereof. And the like.

[0011]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to an apparatus such as a camera applied to a film with a magnetic recording section, comprising a magnetic head for reading information from a magnetic recording section of the film, a motor and the like. A camera or the like applied to a film with a magnetic recording portion, which has a noise source of (i) and a magnetic shield member provided on a component not directly related to the noise source, which is opposed to a terminal of the noise source. .

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) FIGS. 1 and 2 show a first embodiment of the present invention. FIG. 1 is a layout view of a camera using a film with a magnetic recording member as viewed from the front, and FIG. 2 is a layout view of the camera of FIG. 1 as viewed from a side.

1 and 2, 1 is a camera body, 2 is a lens barrel including a photographing lens, 3 is a film cartridge containing a film 4 having a magnetic recording section, and 4 is an emulsion for recording an image. A film 4a having a magnetic recording layer on the side opposite to the side is a perforation provided so that the camera can control a frame of the film 4 and a stop position.

5 is a film feed motor as a power source for winding and rewinding the film, 5a is an output shaft of the motor 5,
5b is a motor cap on the terminal side of the motor 5, and 6 is a pinion gear for transmitting the rotation of the motor to the power transmission system 9. Reference numeral 7 denotes a shield member for shielding magnetic flux leaking from the motor. The material used is electromagnetic soft iron, silicon steel plate, or permalloy, and a thin plate may be wound several times. Needless to say, the motor may be fitted into the motor.

Reference numeral 8 denotes a film winding spool for winding and winding the film 4; 8a, a spool gear meshing with a gear (not shown) of a power transmission system 9; A known power transmission system 10 for transmitting power to the gear 10a has one end engaged with a key portion (not shown) of the film cartridge 3, and the film 4 is wound into the film cartridge by the power transmitted by the power transmission system 9. A fork gear 10a for returning the film 4 or sending out the film 4 is a gear portion that meshes with the power transmission system 9.

Numeral 11 denotes a writing capability for magnetically recording the photographic data of the frame outside the photographic screen of the film while the film is being wound up by one frame, and a film cartridge once taken out of the camera without being completely removed. When loaded in a camera, the magnetic head is a magnetic head having a reading ability for determining how many frames of the film cartridge have been photographed while reading the magnetic information for each frame while feeding the film. .

Reference numeral 12 denotes Xi for issuing a camera flash.
A tube 13 is a reflector for efficiently irradiating the light emitted from the Xe tube forward, and a condenser 14 stores energy for flash emission.

Reference numeral 15 denotes a battery compartment for loading a battery which is a power source of the camera, 16 denotes a battery loaded in the battery compartment 15 as a power source of the camera, and 17 denotes a battery inside the battery compartment as shown in FIG. A magnetic shield member affixed so as to match the curvature. The material is made of a high magnetic permeability magnetic material such as a silicon steel plate or a permalloy material to facilitate passage of magnetic flux. In the present embodiment, it is stuck on the inner wall of the battery room, but it goes without saying that it may be stuck on the upper surface of the battery room.

Reference numeral 18 denotes a finder unit for determining the composition by looking at the photographer.

Generally, a film feed motor 5 for a camera
Are often housed in a film winding spool 8 in order to reduce the size of the camera. With such a configuration, in a system in which magnetic writing is performed during film winding, the distance between the film feeding motor 5 and the magnetic head 11 is short, and there is a limit to the size of the winding spool in order to shield the outer periphery of the motor. In addition, the cap on the terminal side of the outer cylindrical portion of the film feeding motor 5 is made of plastic and has a large leakage magnetic flux. In the present embodiment, the high magnetic permeability magnetic material 17 is used for a part of the battery chamber of the camera, which is a component that is not directly related to the film feeding motor 5 facing the terminal of the film feeding motor 5. It acts as a magnetic shield for the terminal side of the motor 5 so as to prevent magnetic flux leaking from the motor terminal side (brush side) from going to the magnetic head, and to prevent noise flux from the film feeding motor 5 from leaking. Shield.

(Second Embodiment) FIG. 3 shows a second embodiment of the present invention. In FIG. 3, the same components as those in FIG. 1 are denoted by the same reference numerals. Reference numeral 5 denotes a film feeding motor, which has a layout that is upside down from that of the first embodiment. Reference numeral 8 denotes a film winding spool for winding and winding the film 4; 8a, a spool gear meshing with a gear (not shown) of a power transmission system 22;
A known power transmission system for transmitting power to the camera, a lower gear 23a for transmitting power on the lower surface side of the camera to the upper surface,
This is a fork transmission gear composed of a shaft 23b and an upper gear 23c. Reference numeral 24 denotes a condenser for storing energy for flash emission, and reference numeral 25 denotes a battery mounted as a power supply for the camera, which is arranged vertically outside the winding spool.

Reference numeral 26 denotes a flash Xe tube 12, a reflector 1
3, a flash unit magnetic shield member affixed to the lower surface of the flash case 26; 28, a finder magnetic shield member affixed to the lower surface of the finder unit 18; Use a high permeability magnetic material such as permalloy to facilitate passage of magnetic flux. In the second embodiment, the flash magnetic shield member 27 and the finder magnetic shield member 28 are used in combination, but it goes without saying that either one may be used.

In this embodiment, a film feeding motor 5 is used.
By using the high permeability magnetic materials 27 and 28 for a part of the flash case 26 and the finder unit 18 which are components not directly related to the film feeding motor 5 facing the terminals of It acts as a magnetic shield to prevent the magnetic flux leaking from the motor terminal side (brush side) from going to the magnetic head, thereby shielding the leak noise magnetic flux from the film feed motor 5.

(Correspondence between the Invention and the Embodiment) In the above embodiment, the magnetic head 11 is used as the magnetic head of the present invention, the film feed motor 5 is used as the motor of the present invention, and the film feed motor is used as the battery. The chamber 15, the finder unit 18, and the flash case 26 are components that are not directly related to the motor of the present invention, and the battery chamber magnetic shield member 17, the flash unit magnetic shield member 27, and the finder magnetic shield member 28 are the magnetic shield members of the present invention. The battery chamber 15 corresponds to the battery chamber of the present invention, the finder unit 18 corresponds to the finder section of the present invention, and the flash case 26 corresponds to the flash section of the present invention.

The above is the correspondence between the components of the embodiment and the components of the present invention. However, the present invention is not limited to the configuration of the embodiment, and the functions described in the claims or the implementation of the present invention are not limited thereto. It goes without saying that any configuration may be used as long as the function of the configuration of the embodiment can be achieved.

For example, the magnetic head of the above embodiment has a function of recording and reading magnetic information, but the present invention provides a magnetic head having a function of recording or reading magnetic information. However, it is applicable.

Further, in the above embodiment, the magnetic head is shielded from the magnetic noise of the film feeding motor. However, the present invention is not limited to other motors such as a lens driving motor, and further includes a motor mounted thereon. Other magnetic noise sources such as batteries, DC / DC converters, and strobes can be similarly applied. In that case, the film feed motor of the above embodiment may be replaced with these noise sources.

The arrangement of the shield members in the above embodiment may be changed as appropriate. For example, in the above embodiment, the magnetic shield members 17, 27, and 28 are provided in a part of the battery chamber 15, the flash case 26, and the finder unit 18, respectively. May be.

Further, the magnetic shield member 1 provided in the battery chamber 15 and the flash case 26 of the above embodiment.
7 and 27 may also serve as a magnetic shield member for removing noise from the battery and the flash unit.

In the present invention, the above-described embodiments or their technical elements may be combined as needed.

Further, the present invention may be applied to a case where all or a part of the configuration of the claim or the embodiment forms one device or is combined with another device. , Which may be a constituent element of the device.

Further, the present invention can be applied to various types of cameras such as a single-lens reflex camera, a lens shutter camera and the like, and further to a lab device, a photo video, a scanner, and all other devices applied to a film with a magnetic recording portion. Things.

[0034]

As described above, according to the present invention,
In a device such as a camera applied to a film with a magnetic recording portion, the effect of magnetic noise of a motor or the like on a magnetic head can be effectively removed with a small configuration.

[Brief description of the drawings]

FIG. 1 is a front layout diagram of a camera according to a first embodiment of the present invention.

FIG. 2 is a side layout diagram of the camera according to the first embodiment of the present invention.

FIG. 3 is a front layout diagram of a camera according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Camera main body 2 Photographing lens barrel 3 Film cartridge 4 Film 5 Film feed motor 6 Pinion gear 7 Motor magnetic shield member 8 Film winding spool 9 Power transmission system 10 Fork gear 11 Magnetic head (writable and readable) 12 Xe tube 13 Reflector 14 Capacitor 15 Battery compartment 16 Battery 17 Battery compartment magnetic shield member 18 Finder unit 23 Transmission gear 26 Flash case 27 Flash section magnetic shield member 28 Finder section magnetic shield member

Claims (9)

[Claims] 1. An apparatus applied to a film with a magnetic recording section, comprising: a magnetic head for reading information from a magnetic recording section of the film; a motor; and a terminal facing the motor.
An apparatus applied to a film with a magnetic recording portion, comprising: a magnetic shield member provided on a component not directly related to the motor. 2. The apparatus according to claim 1, wherein the magnetic shield member is provided in a battery compartment. 3. The apparatus according to claim 2, wherein the magnetic shield member is provided in accordance with a curvature of a battery to be loaded. 4. The apparatus according to claim 1, wherein the magnetic shield member is provided in a flash unit. 5. The apparatus according to claim 1, wherein the magnetic shield member is provided in a finder section. 6. The apparatus according to claim 1, wherein the motor is a film feed motor. 7. The apparatus applied to a film with a magnetic recording section according to claim 1, wherein the apparatus applied to the film with a magnetic recording section is a camera. 8. An apparatus applied to a film with a magnetic recording portion, wherein a magnetic head for reading information from a magnetic recording portion of the film and a terminal of a battery to be loaded, which are not directly related to the battery to be loaded. An apparatus applied to a film with a magnetic recording section, comprising: a magnetic shield member provided on a constituent member. 9. The apparatus applied to a film with a magnetic recording section according to claim 8, wherein the apparatus applied to the film with a magnetic recording section is a camera.