JPH0675285A - Magnetic recording and reproducing head for camera - Google Patents

Abstract

PURPOSE:To provide a magnetic recording and reproducing head for a camera preventing scratching caused by the contact of a magnetic head with a film, simultaneously, the abrasion of a head caused by its contact with a film perforation and the unstability of the contact of the head with a magnetic recording surface. CONSTITUTION:In the camera using a photographed film with a magnetic information recording part and having the magnetic head pressed so as to contact with the magnetic information recording part at the moving the film and recording or reproducing the magnetic signal of photographing information, printing information, etc., the magnetic recording and reproducing head for the camera 1 has a characteristic that surfaces except at least, the surface contacting with the magnetic information recording part, out of the surfaces contacting with the film of the cover case 3 of the magnetic head 1 are formed as slopes 3b and 3c so as to be separated from the photographed film surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
A reproducing head, more specifically, in a camera that uses a photographic film with a magnetic information recording unit, when the film is moved, such as when the film is wound, when the film has been photographed.
The present invention relates to a magnetic recording / reproducing head for press-contacting the magnetic information recording unit, recording magnetic signals such as photographing information and print information, or reproducing the magnetic signals recorded on the film.

[0002]

2. Description of the Related Art As a magnetic recording / reproducing head for a camera using a photographic film with a magnetic information recording section, as disclosed in International Patent Application No. WO90 / 04202, a magnetic head is mounted on a film pressure plate. And a magnetic head which is retractable with respect to the magnetic information recording portion of the film, as described in Japanese Patent Laid-Open No. 3-200131, so that the magnetic information recording is performed only when recording / reproducing information. It is known that the parts are brought into contact with each other.

10 to 12 show an example in which a magnetic head proposed by the present applicant is incorporated into a lens shutter camera using a photographic film with a magnetic information recording section. The magnetic head 102 is a flat head having a small thickness and is arranged on the rear lid 108 side of the camera. That is, the circuit board 102a on which the magnetic head 102 is mounted is arranged between the film pressure plate 107 and the rear lid 108 provided on the rear lid 108 side, and the circuit board 102a is fixed to the rear lid 108 by the screw 106. The head surface of the magnetic head 102 is exposed by cutting out a part of the lower part of the film pressure plate 107, and when the head surface closes the rear lid 108, the lower part of the film 104 stretched on the aperture 103c on the camera body 103 side. It is arranged so as to face the magnetic information recording portion outside the perforation (see FIG. 12).

On the other hand, on the camera body 103 side, an aperture 10 having film rails 103b at the upper and lower edges thereof.
A film pressing roller 101 held by a supporting arm 105 is provided at a position near the film supply chamber 109 below 3c so as to be freely inserted and removed. The roller 101 is a roller for pressing the film 104 against the magnetic head 102, and moves toward the rear lid 108 side to move the film 104 prior to the start of film feeding related to, for example, an exposure completion signal. It serves to press and contact the magnetic head 102. Furthermore, the film supply chamber 1
A film guide protrusion 103a having a semicircular tip is formed integrally with the camera body 103 at a position close to 09.

The projection 103a is substantially at the same height as the film rail 103b and is disposed symmetrically with respect to the magnetic head 102 with respect to the roller 101, and when the roller 101 moves to press the film. In addition, the film 104 is supported at two points in cooperation with the roller 101 and brought into pressure contact with the magnetic head 102.

The magnetic head 10 thus arranged.
The film pressing roller 2 is driven by a pulse signal generated at the start of film feeding of the spinning top film.
01 moves from the retracted position shown by the dotted line to the operating position shown by the solid line to move the film 104 to the head 1 as shown in FIG.
While pressing toward 02, the magnetic recording data is written in synchronization with the pulse signal, or the magnetic signal previously written on the film is read out, and the data of the photographing frame is stored next.

When the writing or reading of predetermined data is finished and the count number of the pulses emitted in response to the film feeding amount reaches a predetermined value,
As a result, the motor stops and the film feeding stops. Further, in response to the film feeding stop signal, the film pressing roller 101 is moved to the retracted position shown by the dotted line as shown in FIG. 11, the pressure contact with the film is released, and the next photographing standby state is set.

When the magnetic head 102 is arranged in this manner, the film pressure roller 101 and the projection 103 are arranged.
Since the head 102 is located between a and a, an excessive load is not applied to the film or the magnetic head at the time of feeding the film, and the flatness of the film at the time of feeding is increased to prevent the film from being wound onto the winding spool. The wrapping can be stabilized, and further, if the protrusion 103a is a roller, the load during film feeding can be reduced.

By using the flat type magnetic head as described above, as shown in FIG. 11, a space for mounting the magnetic head can be easily provided in the rear lid, and the magnetic recording can be performed without increasing the thickness of the camera. -A playback device can be installed.

[0010]

By the way, although such a flat type magnetic head is very convenient for mounting on a camera, the required volume is almost the same as that of the conventional magnetic head. However, since it is thin, the head surface for magnetic recording inevitably spreads out in a plane.
Therefore, as shown in FIG. 12, the pressure contact surface of the head to the film 104 is the perforation 104b or the photographing screen 1.
It may cover a part of 04a.

When the image is taken within the photographing screen, there is a problem that the film is scratched when dust, dust, sand grains, etc. enter between the film and the head, and the portion affected by the perforation is the film. Since the holes are punched out by pressing in the manufacturing process, perfect flatness is not maintained around the holes.Therefore, as the film is fed, irregularities and edges around the perforation holes are interrupted in the magnetic head as the film is fed. The head wears very severely and causes a problem in durability.

Further, there is a problem that the pressure contact force between the film and the magnetic head changes due to the intermittent contact due to the unevenness and the edge of the hole, and the magnetic recording / reproducing signal becomes unstable. If the pressure contact force is increased in order to prevent this, then the load of running the film increases, which causes problems such as deterioration of camera performance and faster battery consumption.

Further, the international patent application number WO90 / 0.
The magnetic head disclosed in Japanese Patent No. 4202 also has a possibility that the film surface, particularly the inside of the screen, may be scratched because a part of the magnetic head hangs inside the photographing screen.
The device disclosed in Japanese Patent No. 31 has a magnetic head perform contact and non-contact operations with respect to the film, so that the film surface may be damaged in connection with this operation.

An object of the present invention is to eliminate the above problems of the conventional magnetic head, to prevent scratches due to contact between the magnetic head and the film, and to wear and damage the head due to contact with the film perforation. Another object of the present invention is to provide a magnetic recording / reproducing head for a camera, which can prevent instability of contact with the magnetic recording surface.

[0015]

A magnetic recording / reproducing head for a camera according to the present invention uses a photographic film with a magnetic information recording portion, and when the film is moved, it is pressed against the magnetic information recording portion and photographed. In a camera having a magnetic head for recording or reproducing magnetic signals such as information and print information, at least a surface of a cover case of the magnetic head, which is in contact with the film, other than in contact with the magnetic information recording portion,
It is characterized in that it is formed on an inclined surface that is separated from the surface of the photographic film.

[0016]

The cover case of the magnetic head does not come into contact with the film because the surface of the cover case of the magnetic head other than the surface contacting the magnetic information recording portion is formed as an inclined surface separated from the film surface. .

[0017]

The present invention will be described below with reference to the illustrated embodiments. 1 and 2 are diagrams showing a first embodiment of the present invention. The magnetic recording / reproducing head 1 for the camera of the first embodiment.
In the cover case 3 manufactured by a known method such as press working, a recording / reproducing gap portion 2c is formed on the front surface, and a recording signal current flowing coil 9a and a reproduction signal current are formed on the rear portion. And a core 2a, 2b made of permalloy or the like, around which a coil 9b is wound. The cores 2a and 2b are fixed in the case 3 by an adhesive agent filled in the cover case 3 so that a portion where the gap 2c is formed is exposed to the center of the front surface of the cover case 3, and the core 2a and 2b are exposed. The surface of the formed gap portion 2c and the horizontal strip portion 3a in the middle of the front surface of the case including the gap portion 2c are flush with each other.

Further, the strip-shaped portion 3 formed on the polished surface
The front surface of the case a is formed in an arc shape with respect to the running direction of the film, and prevents the film from being caught during running and the running resistance of the film from increasing due to the large contact surface.

The front surface of the magnetic head 1 is formed with slopes 3b and 3c so that the upper portion and the lower portion of the belt-shaped portion 3a are separated from the photographic film surface. That is, the strip-shaped portion 3a is formed by a portion corresponding to a portion where the gap portion 2c of the cores 2a and 2b housed inside the case 3 is formed, and the case surfaces of the upper portion and the lower portion of the portion 3a are strip-shaped. It is formed on the inclined surfaces 3b and 3c that recede from the portion 3a.

On the back surface of the magnetic head 1, the connection terminals 2d, 2 connected to the coils 9a, 9b inside are connected.
d is projected, and the connection terminals 2d and 2d are fixed to the case 3 by filling a sealant.

FIG. 2 shows a state in which the magnetic head 1 of the first embodiment having the above-mentioned structure is attached to the rear lid of the camera and brought into contact with the magnetic information recording portion of the film 8. That is, the magnetic head 1 is mounted on the circuit board 10 by inserting the connection terminals 2d and 2d into the board and soldering the connection terminals 2d and 2d to a printed circuit on the board. When the substrate 10 is fixed to the rear lid of the camera and the rear lid is closed, the gap portion 2c of the magnetic head 1 is magnetically coated on the back surface of the film 8 on which the camera body 4 is stretched. It is installed at the position where it abuts.

On the other hand, on the camera body 4 side, an opening 4a is formed at a position where the gap portion 2c portion of the magnetic head 1 faces, and a film pressing roller 5 is provided on the side of the opening 4a. It is adapted to project in and out freely toward the surface of the film facing the information recording portion.
That is, the pressure contact roller 5 is rotatably attached to a support shaft 6 fixed to the tip of a lever 7 driven by a pressure contact drive mechanism (not shown) arranged in the camera body 4. However, when recording or reproducing is performed on the magnetic information recording portion by the magnetic head 1, a part of the peripheral surface of the press roller 5 projects from the opening 4a and presses the film surface. .

The magnetic head 1 arranged as described above.
In the state where the rear lid is closed and the gap portion 2c is in contact with the magnetic information recording portion of the spreading film 8, the upper and lower inclined surfaces 3 of the gap portion 2c portion on the front surface of the cover case.
b and 3c are separated from the film 8 as shown in FIG.
Therefore, in this state, the surface of the cover case of the magnetic head other than the surface in contact with the film, which is in contact with the magnetic information recording portion, is separated from the surface of the photographic film. Do not touch.

Therefore, when the film 8 travels and magnetic recording or reproduction is performed by the magnetic head 1 contacting the recording portion of the film, the front surface of the cover case does not come into contact with the photographing screen, and dust, sand grains, etc. are caught. Does not damage the shooting screen, the durability of the magnetic head is impaired by the edge of the perforation, the emulsion of the film peels off and the inside of the camera becomes dirty, resulting in a problem that interferes with the operation of the camera. Can be prevented.

3 and 4 show a second embodiment of the present invention. The magnetic head 11 of the second embodiment is formed in a laterally long shape along the traveling direction of the film, and has a contact head portion 11a protruding forward in the center thereof. A gap portion 12a formed of cores 12b and 12c housed inside the cover case 13 is exposed in the middle of the contact head portion 11a.

An inclined surface 13a is formed at the upper edge of the cover case 13 of the horizontally long magnetic head 11 so as to be separated from the photographic film surface. The magnetic head 11 is configured as, for example, a recording-only magnetic head, and the front core 1 that forms the gap portion 12a inside the cover case 13 as shown in FIG.
2b and the back core 12c around which the coil 14 is wound are fixed to the case 13 by being filled with a sealant,
On the back surface of the magnetic head 11, connecting terminals 15a and 15b connected to the coil 14 inside are projected, and the connecting terminals 15a and 15b are fixed to the case 13 by filling a sealing agent. There is.

The magnetic head 11 of the second embodiment constructed as described above operates in the same manner as the magnetic head 1 of the first embodiment.

FIG. 5 shows a third embodiment of the present invention. The magnetic head 21 of the third embodiment is applied to a magnetic head having a magnetic information recording portion provided on the back surface of the film 8 between the perforations. That is, the magnetic head 21 is formed with an abutting head portion 21a whose lower portion projects in an arc shape, and the cover case 23 is provided in the middle of the head portion 21a.
Gap 22 formed by the core housed inside
a is exposed, and the gap portion 22a is brought into pressure contact with the magnetic information recording portion. The upper part of the front surface of the head 21 is formed as an inclined surface 13a so that the cover case 23 is separated from the photographic film surface. The magnetic head 21 of the third embodiment configured as described above operates in the same manner as the magnetic head 1 of the first embodiment.

FIGS. 6 and 7 show a fourth embodiment of the present invention. The magnetic head 31 of the fourth embodiment is composed of a thin head in which the surface facing the film 8 is formed in a horizontally long rectangular shape, and its cover case 3
A horizontally long rectangular contact head portion 31a having a slightly flat surface portion is formed in the central portion of 3. The head part 31
A gap portion 32a formed of a core housed inside the cover case 33 is exposed in the middle of a, and the gap portion 32a is brought into pressure contact with the magnetic information recording portion of the film 8. The magnetic information recording portion is a film 8
Outside the perforation of the film to the edge of the film. Then, the contact head portion 31a
The upper, lower, left, and right front surfaces of the case are formed as slopes 31b to 31f that are inclined toward the peripheral edge of the case.

FIG. 7 shows a state in which the magnetic head 31 is in contact with the magnetic information recording portion of the film 8, and when the contact head portion 31a is in pressure contact with the magnetic information recording portion,
The inclined surface 31b of the magnetic head 31 should not come into contact with the screen and perforation of the film, and
The slopes 31c are separated from the platen rail and other protrusions so as not to come into contact therewith, and the slopes 31d and 31f are away from each other in the traveling direction of the film 8.
Reduces running resistance and stabilizes the film and magnetic head 31
And are pressed against each other. The dimension L of the contact head portion 31a in the width direction is determined by the track width for magnetic recording and reproduction, and press drawing is performed so as to have a value slightly larger than the thickness of the core. It is processed by etc.

8 and 9 show a fifth embodiment of the present invention. The magnetic head 41 of the fifth embodiment is formed so that its side surface shape and vertical cross-sectional shape are in the shape of an inverted L, and its upper portion is formed in the contact head portion 41a protruding forward. . A gap portion 42a formed by a core 42b housed inside a cover case 43 is exposed at the center of the contact head portion 41a, and the gap portion 42a serves as a magnetic information recording portion of the film 8. It is designed to be pressed. This contact head portion 4
The front surface of 1a is formed in an arc shape in the traveling direction of the film, and the surface including the gap portion 42a is ground so as to be flush with the case. Further, in the cover case 43, as shown in FIG.
The front core 42b forming a and the back core 42c around which the coil 44 is wound are both cores 42b, 42c.
Surface 4 polished to 45 degrees so that forms an inverted L shape
The coil 44 is stored by being fixedly bonded to the coil 2d.
A connection terminal 45 protruding from the back surface of the head is connected to. These are fixed to the cover case 43 by being filled with a sealing agent.

The cover case 43 is also drawn so as to have an inverted L-shape according to the shape of the inner core.
The protrusion width dimension L1 of the contact head portion 41a including the gap portion 42a is formed to be as small as possible while satisfying the required track width. This is to reduce the contact portion as much as possible when contacting the film so as to prevent running resistance and reduce the life of the head at the edge of perforation.

FIG. 8 is a view showing a usage state of the magnetic head 41 of this embodiment, in which the back surface of the film 8 is magnetically coated on the outer side of the perforation 8a, and the contact head is brought into contact therewith. The portion 41a is in pressure contact. The camera body 46 has a film rail surface 46a and a pressure plate rail surface 4 on both sides of the screen opening (aperture).
6b are provided. The film rail surface 46a
Is a guide rail for determining the flange back of the camera, and the pressure plate rail surface 46b is a guide rail for pressing the pressure plate 47. And this pressure plate 47
A gap between the film rail surface 46a and the film rail surface 46a forms a tunnel-shaped groove in the running space of the film 8 to hold the film.

The magnetic head 4 of the camera body 46
An opening 46c is formed in a portion facing 1
A part of the film pressure contact roller 48 comes in and out through the opening 46c. The film pressing roller 48 is rotatably held by a support shaft 50 fixed to a support plate 49, which is prevented from coming off by a retaining ring or the like. The support plate 49 is moved in the direction indicated by the arrow by a moving mechanism (not shown) that operates in conjunction with the film feeding. The film pressing roller 48 is in a retracted position in which the film is normally retracted from the opening 46c, and is exposed to the completion of the exposure and is moved so as to project from the opening 46c and presses the film prior to the signal to start the film feeding operation. , Plays a role of bringing the magnetic information recording unit into pressure contact with the magnetic head 41 at a predetermined pressure.

The film pressure roller 48 is made of an elastic material such as soft plastic or rubber, and can be manufactured without finely adjusting the position of the roller and the magnetic head and adjusting the contact force. In addition, it is possible to suppress variations in recording and reproducing signals.

When the magnetic head 41 is formed in an inverted L-shape and further flattened as described above, not only the scratches on the film and the life of the head can be extended, but also the protrusions such as the pressure plate rail and the film guide member. It can be mounted on the rear lid while avoiding the above, and the magnetic head can be incorporated without largely changing the shape of the camera body.

Further, in the single-lens reflex camera and the like, the one in which the rear lid can be freely exchanged by the user has been put on the market, but by adopting the head as described above, magnetic recording can be performed. When combined with a possible circuit and a rear lid that has an operating section, magnetic recording can be performed using a film that can be magnetically recorded even on existing single-lens reflex cameras of this type, etc. To be done.

Further, in most of the above-mentioned embodiments, the magnetic information recording portion is provided outside the perforation of the film, but the range to which the magnetic head of the present invention is applied is not limited to this. Needless to say, the type of recording between the perforations can also be used.

[0039]

As described above, according to the present invention, there is no fear of scratching the screen, the contact area is reduced, the life of the magnetic head is extended, and the running resistance of the film is reduced. Does not have to significantly reduce the performance of
Further, the remarkable effect that the life of the battery is extended is exhibited.

[Brief description of drawings]

FIG. 1 shows a magnetic recording for a camera according to a first embodiment of the present invention.
The perspective view of a reproducing head.

FIG. 2 is a cross-sectional view of essential parts showing a usage state of the magnetic head of the first embodiment.

FIG. 3 shows a magnetic recording for a camera according to a second embodiment of the present invention.
The perspective view of a reproducing head.

FIG. 4 is a vertical cross-sectional view of a main part of the magnetic head of the second embodiment.

FIG. 5 shows a magnetic recording for a camera according to a third embodiment of the present invention.
The perspective view of a reproducing head.

FIG. 6 shows a magnetic recording for a camera according to a fourth embodiment of the present invention.
The perspective view of a reproducing head.

FIG. 7 is a front view showing a usage state of the magnetic head of the fourth embodiment.

FIG. 8 is a cross-sectional view of essential parts showing a usage state of a magnetic head according to a fifth embodiment of the present invention.

FIG. 9 is a perspective view of the magnetic head of the fifth embodiment.

FIG. 10 is a perspective view showing a state in which a rear lid of a camera in which a flat magnetic head is incorporated is opened.

11 is an enlarged sectional view of an essential part showing the operation of the flat magnetic head of FIG.

12 is a front view showing a state in which the flat magnetic head of FIG. 10 is pressed against a film.

[Explanation of symbols]

1, 11, 21, 31, 41 ... Magnetic heads 3, 13, 23, 33, 43 ... Cover cases 3b, 3c, 13a, 23a, 31b, 31c, 31
d, 31f …… Slope 8 ……………… Film

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] January 21, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0038

[Correction method] Change

[Correction content]

In most of the above-mentioned embodiments, the magnetic information recording portion is provided outside the perforation of the film, but the magnetic head of the present invention is not limited to this, and the perforation is not limited thereto. Needless to say, the type of recording between recording and perforation can also be used. In addition, this implementation
In the example, the surface other than the magnetic information recording surface is separated from the photographic film surface.
Formed by a slope (see FIG. 6) or a flat surface (see FIG. 9)
However, the above-mentioned slanted surface or flat surface is formed into a contact head portion as shown in FIG.
As in 41a, it may be a part of an arcuate spherical surface . ─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] August 27, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0039

[Correction method] Change

[Correction content]

[0039]

According to the present invention as described according to the present invention above, no worry about scratching the screen, since either One film running resistance causes reduced, finished without degrading the performance of the camera increases, further life of the battery It also has the remarkable effect of becoming longer.

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

Claims (1)

[Claims] 1. A magnetic head which uses a photographic film with a magnetic information recording section and which is pressed against the magnetic information recording section when the film is moved to record or reproduce magnetic signals such as photographic information and print information. In a camera having a magnetic head for a camera, characterized in that at least a surface of the cover case of the magnetic head that is not in contact with the magnetic information recording portion is formed into an inclined surface that is separated from the surface of the photographic film. Recording / playback head.