JP2001134903A - Magnetic head unit, pressing plate using the magnetic head unit, and camera using the pressing plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and accurately position a magnetic head with respect to a pressing plate. SOLUTION: A magnetic head unit 5 includes a back shield 1 attached to the rear surface side of a magnetic head 109. The back shield 1 is formed to be larger than an area seen from the sliding surface side of the magnetic head 109. Bent parts 1a, 1b and 1c are provided in positions orthogonal to the sliding direction of a recording medium. The back shield 1 has attaching holes 2 and 3 for a pressing plate positioned in the sliding direction of the recording medium. Assembling positioning with respect to the camera pressing plate is easy, and thus highly accurate positioning is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head of a magnetic recording / reproducing apparatus for recording / reproducing information on / from a magnetic medium, and particularly to recording / reproducing information on / from a magnetic storage unit provided on a film. The present invention relates to a magnetic head suitable for a camera having a magnetic head.

[0002]

2. Description of the Related Art In recent years, a camera using a film having a magnetic storage unit and capable of recording or reproducing information such as photographing conditions and date on the magnetic storage unit has been developed and put on the market. . Information relating to the camera includes the number of shots, shutter speed, aperture value, exposure correction value, date, title, and the like.

A magnetic head for recording or reproducing such information in a magnetic storage unit of a film is provided in a camera. By recording these pieces of information on the film, it is easy to change the film during photographing, and the processing during development and printing becomes constant. Alternatively, it can be applied to a multimedia device that uses a photographic image processed by a personal computer using a film scanner, and is expected to be extremely promising in the future.

FIG. 12 is a diagram showing a schematic configuration example of a camera capable of recording or reproducing magnetic information. 12, reference numeral 100 denotes a camera body, 101 denotes a lens, 102 denotes a film cartridge loaded in the camera body 100, and 103 denotes a film drawn from the film cartridge 102. FIG. 12 shows a state in which the film 103 is wound on the winding spool 105 via the guide roller 104.

Reference numeral 106 denotes a film guide for guiding the film 103 along a predetermined traveling path, and 107 denotes a magnetic head 109 for interposing the film 103 between the film guide 106 and recording or reproducing magnetic information. The pressure plate is supported so as to be in sliding contact with the film 103. The pressure plate 107 is elastically supported by the camera body via a pressure plate spring 108.

A magnetic head 109 for recording or reproducing magnetic information on or from a film 103 is shown in FIGS.
As shown in (1), it is provided in the longitudinal direction at a position corresponding to the end of the film 103 on the pressure plate 107. In this case, the detailed arrangement position of the magnetic head 109 differs depending on the design of the magnetic storage unit.
It is a position where shooting information can be recorded or reproduced at a predetermined timing for each shooting frame 03.

When the magnetic head 109 is mounted on the pressure plate 107, as shown in FIG. 13, a window 107a is provided at a predetermined position of the pressure plate 107, and the magnetic head 109 is connected to the magnetic storage portion of the film 103 through the window 107a. 103a
Expose to the side. At this time, track position, azimuth,
The magnetic head 109 is fixed to the pressure plate 107 by precisely positioning in the roll direction and the pitch direction, and is brought into sliding contact with the film 103.

As shown in FIG. 13, a pair of guide rods 1 for running and positioning the film 103 are provided on the pressure plate 107.
12, 113 are formed so as to protrude toward the film 103 side. The guide bars 112 and 113 guide the edge 103b of the film 103.

FIG. 14 shows a general magnetic head element. FIG. 15 is a diagram showing a magnetic head containing a general magnetic head element. The above-described magnetic head 109 usually has a configuration as shown in FIGS. 14 and 15, and is formed by the following procedure. That is, a plurality of substantially C-shaped core halves 120a formed by stamping a thin sheet of magnetic material (for example, permalloy or high-hardness permalloy) or the like are laminated and joined, and the magnetic core halves 1a and 1b are laminated.
20. Then, the surface forming the magnetic gap 121 in the magnetic core half-rest 120 is subjected to grinding one lap or the like to form an abutting surface.

Thereafter, a coil bobbin 122 around which a coil 123 is wound is mounted on the rear side, and a pair of magnetic core half-rests 120 are opposed to each other via a non-magnetic material 121 serving as a magnetic gap to form a magnetic head. It is common. The magnetic head element thus configured is directly housed in the holding case 125, or assembled into a holder (not shown) and then filled with an adhesive. Then, the running surface of the film is ground and wrapped into a predetermined curved shape to form the magnetic head 109.

The terminal 124 for making an electrical connection to an external circuit is known as a conventional magnetic head, but may be formed integrally with the coil bobbin 122 described above. Alternatively, the coil 123
May be connected. In the case of a magnetic head having a reproducing function, it is desirable that the holding case 125 be formed of a shield case made of a magnetic material in order to prevent the influence of noise from surrounding motors and the like.

Further, by attaching the back shield 130 to the rear surface side of the magnetic head 109 as shown in FIGS. 16 and 17, the influence of noise can be prevented. The back shield 130 has a bent portion 130
A, 130b, 130c and 130d have a box shape and are fixed to the holding case 125 of the magnetic head 109 by welding or the like. The holding case 130 has a groove 13 for escaping the terminal 124 of the magnetic head 109.
0f and a ground terminal 130e between the terminal 124 with a part of the back shield 130 protruding.

If the magnetic core 120 is electrically connected to the holding case 125, the magnetic shield 120 can be grounded by welding and fixing the back shield 130. As a result, noise caused by sneaking from the circuit can be prevented. When the magnetic core 120 and the holding case 125 are not electrically connected, the magnetic core 120 and the back shield 130 are electrically connected by a conductive means such as a conductive adhesive. If there is no concern about sneaking noise from the circuit, the ground terminal 130e is unnecessary.

[0014]

By the way, a camera capable of recording or reproducing the above-mentioned magnetic information has been required to be further reduced in size. The pressure plate to which the magnetic head is attached is required to be thinner. Further, among cameras capable of recording information such as date by being able to record or reproduce magnetic information, low-cost cameras (hereinafter, "camera" includes a so-called lens-equipped film). It is desired to expand,
The parts used are also required to be reduced in cost.

The azimuth accuracy when the magnetic head is assembled into the pressure plate is required to be within ± 30 minutes as a standard. If various variations are taken into consideration, unless the assembly is performed with the tolerance narrowed, the inconvenience of the camera will occur, which will cause a problem. Therefore, it is necessary to make sufficient adjustments.
Then, as it is, the number of assembling steps is increased, so that it is necessary to easily perform high-precision positioning.

Further, as the size of the camera is reduced, parts which are noise sources of the magnetic head such as a motor used in the camera are also mounted near the magnetic head. Therefore, the magnetic head is also required to have sufficient resistance to various noises.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to enable easy and accurate positioning of a magnetic head with respect to a pressure plate. Another object of the present invention is to provide a magnetic head unit resistant to noise. It is another object of the present invention to provide a camera pressure plate incorporating a magnetic head unit that achieves the above-mentioned objects, and a camera using the camera pressure plate.

[0018]

A magnetic head unit according to the present invention is a magnetic head unit having a back shield attached to a rear surface side of a magnetic head, wherein the back shield is viewed from a sliding surface side of the magnetic head. And a bent portion that is formed in a direction perpendicular to the recording medium sliding direction.

Further, in the magnetic head unit according to the present invention, the back shield has a hole for attachment to a pressure plate located in the sliding direction of the recording medium. In the magnetic head unit of the present invention,
The back shield has a positioning portion for positioning the magnetic head in the sliding direction of the recording medium. In the magnetic head unit of the present invention,
The back shield has a bent portion for positioning and fixing the magnetic head in the recording medium sliding direction.

Further, in the magnetic head unit according to the present invention, the back shield has a bent portion formed on at least one side of an outer peripheral portion located in the recording medium sliding direction toward the sliding surface side. It is characterized by. Further, in the magnetic head unit according to the present invention, the bent portion of the back shield is substantially at the same height as the sliding surface.

A camera pressure plate according to the present invention is characterized in that any one of the above magnetic head units is incorporated.

Also, in the camera pressure plate of the present invention, the magnetic head unit is positioned and fixed by incorporating the mounting hole provided in the back shield of the magnetic head unit into a reference portion. It is characterized by the following. Further, in the camera pressure plate of the present invention,
The positioning and fixing of the magnetic head is set on the sliding surface side.

A camera according to the present invention includes any one of the above-described camera pressure plates.

According to one aspect of the present invention, in a magnetic head unit having a back shield attached to a rear surface side of a magnetic head, a back shield having an area larger than an area viewed from a sliding image side of the magnetic head is recorded on the back shield. A bent portion is provided in a portion orthogonal to the sliding direction of the medium to position and fix the magnetic head, and a hole for attaching a pressure plate is provided in the back shield in the sliding direction of the recording medium. By attaching the back shield to the magnetic head as in this example, it is possible to easily perform the mounting position determination with respect to the camera pressure plate, and easily perform the high-precision position determination.
Further, it is possible to realize a camera pressure plate that is less affected by external noise.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the accompanying drawings, using the same reference numerals for members substantially the same as or corresponding to those of the conventional example. (First Embodiment) FIG. 1 is an external view showing a state in which a back shield is attached to a magnetic head according to the present embodiment. FIG. 2 is an external view showing the magnetic head to which the back shield according to the present embodiment is attached.

The above-described magnetic head 109 shown in FIG.
The back shield 1 attached to the rear surface side of the holding case 125 is larger than the area of the magnetic head 109 viewed from the sliding surface 120a side. Folded portions 1a, 1b, 1c are provided at portions orthogonal to the sliding direction of the recording medium,
The magnetic head 109 is fixed and held, and the magnetic head 109 is positioned with respect to a pressure plate, which will be described later.

The bent portion 1c is provided with a ground terminal 1d protruding and extending. Although the reference holes 2 and 3 have been described as being provided one by one on each side, if necessary for adjustment or the like, a plurality of (two or three) reference holes may be provided on one side.

As a material for the back shield 1, a permalloy, which is a magnetic material, is suitable for preventing the influence of noise from a motor or the like. Depending on the type of noise, stainless steel or a copper alloy may be used. The thickness of the back shield 1 is from t0.1 to
The thickness is desirably about 0.5 mm, and a thickness of t0.2 to 0.3 mm is preferable in terms of mechanical strength such as prevention of deformation of the back shield 1.

The magnetic head unit 5 shown in FIG. 2 is obtained by attaching the magnetic head 109 to the back shield 1 configured as described above.

The bent portions 1a, 1b,
The position of the magnetic gap 121 is positioned with respect to at least one of the reference holes 2 and 3 to the holding case 125 of the magnetic head 109, and the position thereof is fixed by welding or an adhesive.

With this configuration, the back shield 1 has a surface larger than the area viewed from the sliding surface 120a side of the magnetic head 109, so that noise flowing into the magnetic core 120 can be largely prevented. Also, as the width of the reference holes 2 and 3 in the sliding direction of the recording medium is wider, the deviation of the dimensions of the reference holes 2 and 3 and the deviation of the inclination of the magnetic gap 121 due to the variation of the dimensions of the mounting portion of the pressure plate are smaller. Become.
Therefore, the size of the back shield 1 in the sliding direction of the recording medium is desirably about 1.5 to 3 times the dimension of the magnetic head 109 in the sliding direction of the recording medium. preferable.

Second Embodiment Next, a second embodiment of the present invention will be described.
An embodiment will be described. FIG. 3 is an external view showing a back shield according to the second embodiment. In the second embodiment, the magnetic head 10 is attached to the back shield 1 shown in FIG.
A plurality of half blanks 6 for positioning the recording medium in the sliding direction are provided. In this example, two magnetic heads are provided on both sides, that is, four magnetic heads are provided in total.

The half blank 6 is not limited to the above example, and one or two half blanks 6 may be provided on one side as long as positioning is possible. Further, the shape of the half blank 6 may be any shape as long as it does not hinder processing, such as a columnar shape, a square shape, or the like, as well as a spherical shape.

With this configuration, the gap 1 of the magnetic head 109 from the reference hole 2 or 3 can be precisely formed by the molding die.
21 position references can be made. Thus, simply pressing the magnetic head 109 against the half blank 6 can easily and accurately secure the gap position.

(Third Embodiment) Next, a third embodiment of the present invention will be described.
An embodiment will be described. FIG. 4 is an external view illustrating a back shield according to the third embodiment. In the third embodiment, the magnetic head 10 is attached to the back shield 1 shown in FIG.
Cut and raised portions 7 and 8 for positioning the recording medium in the sliding direction are provided. In this example, the provision of the cut-and-raised portions 7 and 8 facilitates securing the gap position as in the second embodiment.

(Fourth Embodiment) Next, a fourth embodiment of the present invention will be described.
An embodiment will be described. FIG. 5 is an external view showing a back shield according to the fourth embodiment. Also, FIG.
FIG. 14 is a partial cross-sectional view illustrating a state where a magnetic head to which a back shield according to a fourth embodiment is attached is mounted on a pressure plate.

The back shield 10 shown in FIG.
The bent portions 10a and 10b for positioning the magnetic head 109 in the sliding direction of the recording medium shown in FIG. The magnetic head unit 11 is obtained by surrounding the magnetic head 109 together with the bent portions 1a, 1b and 1c so as to hold the magnetic head 109. With such a configuration, the attachment between the magnetic head 109 and the back shield 10 becomes stronger.

As shown in FIG. 6, when positioning and fixing the magnetic head unit 11 on the pressure plate 20 formed in the same manner as the above-described pressure plate 107, the magnetic head 109 is made to face the window 20a provided on the pressure plate 20. A reference portion 2 provided in a groove 20b serving as an escape portion of the back shield 10 of the pressure plate 20
Positioning can be easily performed by inserting the reference holes 2 and 3 of the back shield 10 into the base plates 1 and 22, respectively. If it is desired to adjust the inclination of the magnetic gap 121, the reference portion 21,
By making one of the sides 22 smaller than the reference holes 2 and 3, the inclination can be adjusted based on one side.

The amount of protrusion P for enabling the pressure plate 20 to contact the film serving as a medium is determined by the height K of the sliding surface 120a of the magnetic head 109 from the back shield 10 in the magnetic head unit 11. By setting it out, the setting can be made easily and accurately.
That is, the thickness Z of the pressure plate due to the groove 20b provided in the pressure plate 20
Thus, the size of the protrusion amount P can be easily secured simply by bringing the back shield 10 into close contact with the pressure plate 20.

The magnetic head unit 11 includes a pressure plate 20
The terminal 124 also fits in the pressure plate 20.
It is possible to connect to the outside within the thickness. Therefore, it is possible to effectively promote a reduction in the thickness of the camera provided with the camera pressure plate.

(Fifth Embodiment) Next, a fifth embodiment of the present invention will be described.
An embodiment will be described. FIG. 7 is an external view showing a magnetic head with a back shield according to the fifth embodiment. As shown in FIG. 7, bending portions 10c and 10d are provided on both outer sides in the sliding direction of the recording medium of the back shield 10 described in FIG.
The magnetic head unit 12 is obtained by positioning and fixing the magnetic head unit to the position 09.

In the conventional camera 100 shown in FIG. 12, a film winding motor is often arranged in the sliding direction of the recording medium with respect to the magnetic head 109. The closer to the medium sliding surface 120a of the magnetic head 109 at a position slightly distant from the magnetic gap 121 in the sliding direction of the recording medium, the more the noise flowing into the magnetic gap can be prevented. Further, a low-noise magnetic head can be obtained.

(Sixth Embodiment) Next, a sixth embodiment of the present invention will be described.
An embodiment will be described. FIG. 8 is an external view showing a back shield according to the sixth embodiment. FIG. 9 is an external view showing a magnetic head with a back shield according to the sixth embodiment. Further, FIG. 10 is an external view showing a state in which a magnetic head with a back shield according to the sixth embodiment is mounted on a pressure plate, and FIG. 11 is a partial cross-sectional view showing a state in which the magnetic head is mounted on a pressure plate.

The back shield 14 shown in FIG. 8 is provided with bent portions 14a and 14b which are the same as or slightly lower than the sliding surface 120a of the recording medium of the magnetic head 109 (less than 0.2 mm). The magnetic head unit 15 is obtained by surrounding the magnetic head 109 together with the bent portions 1a, 1b, 1c so as to hold the magnetic head 109.

The magnetic head 15 thus constructed
As shown in FIG. 10 and FIG.
When the magnetic head 15 is positioned and fixed on the pressure plate 25 formed in the same manner as in 7, the magnetic head 15 is dropped into the window 25a provided in the pressure plate 25 from the medium sliding image side. Then, by inserting the reference holes 2 and 3 of the back shield 14 into the reference portions 26 and 27 provided on the pressure plate 25, respectively, the position can be easily determined.

With this configuration, since the sliding surface 120a of the recording medium and the mounting surface of the back shield 14 have substantially the same height, it is possible to prevent the intrusion of a large amount of external noise of 16 dB or more. The edge portion S of the back shield 14 on the sliding surface side of the recording medium may be smoothly chamfered or the like so as not to cause scratches on the medium, or may be bent at the lower side in FIG. Required.

In the present embodiment, the magnetic head unit 15 in which the back shield 14 is attached to the magnetic head 109
Is mounted on the pressure plate 25 for positioning and fixing.
Even if the magnetic head 109 is positioned and fixed after the back shield 14 is assembled and fixed to the pressure plate 25, a low-noise camera pressure plate can be similarly obtained.

In each of the above embodiments, it goes without saying that the back shield can be incorporated in the camera pressure plate together with the magnetic head and mounted on the camera.

[0049]

As described above, according to the present invention, by attaching the back shield to the magnetic head, it is possible to easily assemble the camera with respect to the pressure plate for the camera, and to easily achieve high-precision positioning. it can. In addition, a camera pressure plate that has little effect on external noise can be easily obtained, and a magnetic head can be arranged within the thickness of the camera pressure plate to enable connection to an external circuit, resulting in a smaller and thinner device. can do. Accordingly, the cost of the magnetic head can be reduced, and the position of the magnetic head element can be easily and accurately determined at the time of mounting. Also,
According to the present invention, there is an advantage that a magnetic head resistant to noise is provided.

[Brief description of the drawings]

FIG. 1 is an external view showing a state in which a back shield is mounted on a magnetic head according to an embodiment of the present invention.

FIG. 2 is an external view showing a magnetic head to which a back shield according to the embodiment of the present invention is attached.

FIG. 3 is an external view showing a back shield according to a second embodiment of the present invention.

FIG. 4 is an external view showing a back shield according to a third embodiment of the present invention.

FIG. 5 is an external view showing a back shield according to a fourth embodiment of the present invention.

FIG. 6 is a partial sectional view showing a state in which a magnetic head to which a back shield is attached according to a fourth embodiment of the present invention is mounted on a pressure plate.

FIG. 7 is an external view showing a magnetic head with a back shield according to a fifth embodiment of the present invention.

FIG. 8 is an external view showing a back shield according to a sixth embodiment of the present invention.

FIG. 9 is an external view showing a magnetic head with a back shield according to a sixth embodiment of the present invention.

FIG. 10 is an external view showing a state in which a magnetic head to which a back shield is attached according to a sixth embodiment of the present invention is mounted on a pressure plate.

FIG. 11 is a partial cross-sectional view showing a state where a magnetic head to which a back shield is attached according to a sixth embodiment of the present invention is mounted on a pressure plate.

FIG. 12 is a diagram illustrating a schematic configuration example of a camera capable of recording or reproducing magnetic information according to the present invention.

FIG. 13 is a diagram illustrating a mounting state of a magnetic head element on a general pressure plate.

FIG. 14 is a diagram showing a general magnetic head element.

FIG. 15 is a diagram showing a magnetic head containing a general magnetic head element.

FIG. 16 is an external view showing a state in which a back shield is mounted on a general magnetic head.

FIG. 17 is an external view showing a magnetic head to which a general back shield is attached.

[Explanation of symbols]

 1,10,12,14 Back shield 1a, 1b, 1c, 10a, 10b Bent portion 1d Ground terminal 2,3 Mounting reference hole 6 Half cut 7,8 Cut and raised portion 20,25 Pressure plate 21,22,26, 27 Mounting reference portion 109 Magnetic head 120 Magnetic core 120a Medium sliding surface 121 Magnetic gap 124 Terminal 125 Holding case P Projection K Height of magnetic head from back shield Z Pressure plate thickness S Edge

Claims (10)

[Claims] 1. A magnetic head unit having a back shield attached to a rear surface side of a magnetic head, wherein the back shield is formed to have an area larger than an area viewed from a sliding surface side of the magnetic head and a recording medium. A magnetic head unit having a bent portion located in a direction orthogonal to a sliding direction. 2. The magnetic head unit according to claim 1, wherein the back shield has a hole for attachment to a pressure plate located in the sliding direction of the recording medium. 3. The magnetic head unit according to claim 1, wherein the back shield has a positioning portion for positioning the magnetic head in the sliding direction of the recording medium. 4. The magnetic head unit according to claim 1, wherein the back shield has a bent portion for positioning and fixing the magnetic head in the recording medium sliding direction. 5. The back shield has a bent portion formed on at least one side of an outer peripheral portion located in a sliding direction of the recording medium toward a sliding surface side. 5. The magnetic head unit according to any one of 4. 6. The magnetic head unit according to claim 5, wherein the bent portion of the back shield is located at substantially the same height as the sliding surface. 7. A camera pressure plate in which the magnetic head unit according to claim 1 is incorporated. 8. The magnetic head unit according to claim 8, wherein said mounting hole provided in said back shield of said magnetic head unit is incorporated in a reference portion to position and fix said magnetic head unit. The pressure plate for a camera according to 1. 9. The camera pressure plate according to claim 8, wherein the positioning and fixing of the magnetic head are set on the sliding surface side. 10. A camera comprising the camera pressure plate according to claim 7. Description: