JP3501666B2 - Magnetic head mounting - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head mounting body in which a magnetic head is mounted on a head support plate having a reference surface facing a running portion of a magnetic recording medium and a projecting window of the magnetic head, and more particularly, The present invention relates to a magnetic head mounting body in which a protruding dimension with which a sliding surface of a magnetic head projects from the reference surface is set with high accuracy.

[0002]

2. Description of the Related Art A camera using a film provided with a magnetic recording layer and capable of reading data such as film type and film sensitivity, or writing photographed data such as shutter speed, date, title, etc. ,
It has a built-in magnetic head.

FIG. 12 is a sectional view showing a magnetic head mounting body for incorporating the magnetic head in the camera body. In this magnetic head mounting body, the magnetic head 1 has a back surface 2B on a head support plate 2 having a head protruding window 2d.
Installed from the side. The sliding surface 1c of the magnetic head 1 with respect to the magnetic recording medium is projected to the reference surface 2A through the inside of the head projecting window 2d of the head supporting plate 2 and the magnetic head 1
The head base 1a is brought into contact with the back surface 2B of the head support plate 2, and the head base 1a and the head support plate 2 are fixed by an adhesive 3 or a screw.

The magnetic head mounting body is mounted, for example, on the inner surface of the opening / closing lid on the back side of the camera body. At this time,
The reference surface 2A of the head supporting plate 2 is attached so as to face the magnetic recording layer on the back surface of the film in the camera. A plurality of guide pole holes 2c are formed in the head support plate 2. For example, by fitting the guide pole holes 2c into a guide pole that also serves as a film guide portion protruding from the inner surface of the opening / closing lid, The head support plate 2 is attached to the opening / closing lid.

In the camera body, the film is pressed by the head support plate 2, and the sliding surface 1c of the magnetic head 1 contacts the magnetic recording layer on the back surface of the film. When the film is advanced, the film is moved to the head support plate 2
The reference surface 2A is slid, and at this time, the magnetic recording layer of the film slides on the sliding surface 1c of the magnetic head 1 to perform the above-mentioned data reading and data writing.

[0006]

During the winding operation of the film, the sliding surface 1c of the magnetic head 1 and the magnetic recording layer of the film have an optimum degree of adhesion or a facing gap (spacing). In order to allow the film to be slid and to prevent the wound film from impairing the flatness due to the contact with the magnetic head 1, the protrusion dimension δ of the sliding surface 1c from the reference surface 2A of the head support plate 2 is set. Is required to be set extremely minutely and highly accurately. For example, the protrusion dimension δ is required to be less than 0.1 mm , and the tolerance of δ is required to be less than 0.1 mm.

However, in the conventional magnetic head mounting body shown in FIG. 12, the head base 1a of the magnetic head 1 is brought into surface contact with the back surface 2B of the head supporting plate 2 so that the magnetic head with respect to the reference surface 2A of the head supporting plate 2 is brought into contact. The protrusion amount δ of the sliding surface 1c of No. 1 is determined. Therefore, the protrusion amount δ depends on the plate thickness tolerance of the head support plate 2 and the magnetic head 1
Dimensional tolerance, that is, the tolerance of the height dimension from the front surface of the head base 1a to the sliding surface 1c is accumulated, and the tolerance of the protrusion amount δ becomes extremely large. If a rolled steel plate is used as the head support plate 2, the plate thickness tolerance is ±
Since it is about 0.04 mm, the protrusion amount δ cannot be kept within the allowable tolerance range unless the molding size of the magnetic head 1 is made highly accurate.

Therefore, the thickness D of the head support plate 2 and the height dimension L from the head base 1a to the sliding surface 1c of the magnetic head 1 are inspected before starting the process of assembling the magnetic head mounting body. It is necessary to select and combine the head support plate 2 and the magnetic head 1 so that the protrusion amount δ falls within the allowable tolerance range. However, such inspection, selection and combination processes make the assembly of the magnetic head mounting body very complicated.

The present invention is to solve the above-mentioned conventional problems, and to form a gap between the back surface of the head support plate opposite to the reference surface and the mounting portion (head base) of the magnetic head. Thus, it is an object of the present invention to provide a magnetic head mounting body in which the amount of protrusion of the head support plate from the reference surface can be set with high accuracy.

[0010]

According to the present invention, there is provided a head having a reference surface facing a running portion of a magnetic medium, a back surface facing away from the reference surface, and a penetrating opening between the reference surface and the back surface. Magnetic head mounting in which a head supporting plate having a protruding window and a magnetic head having a sliding surface for a recording medium at a front portion and a mounting portion protruding at a base portion in a direction parallel to the sliding surface are combined. in the body, the mounting portion
Both sides of the sliding surface are provided on the surface facing the head support plate.
Positioning hole located at and more than this positioning hole
A concave shape formed at an outer position away from the sliding surface or
A convex adhesive blocking means is provided, and
The support plate has a through hole facing the positioning hole.
Are, the sliding surface is installed from the back side of the head support plate in a state that appeared on the reference surface side from said head projecting window, the sliding surface a predetermined size protruding from said reference surface, the mounting portion And a back surface of the head support plate, a gap is formed between the damming means of the mounting portion.
Also, the outer side portion and the back surface of the head support plate are fixed with an adhesive.

In the magnetic head mounting body of the present invention, the magnetic head is installed from the back surface side opposite to the reference surface of the head support plate, and the head protrusion formed by penetrating the sliding surface of the magnetic head into the head support plate. The head support plate is projected from the window to the reference surface side. As the amount of projection of the sliding surface from the reference plane at this time becomes the set value (within the permissible range of the specified value), a combination of the head supporting plate and the magnetic head, the head supporting plate and the magnetic head in this condition Fix it with the adhesive.
The protrusion amount is set by abutting the reference surface of the head support plate and the sliding surface of the magnetic head against different abutting portions, or by holding the head support plate and the magnetic head separately. To be done.

Since the position of the sliding surface of the magnetic head is determined with reference to the reference surface of the head support plate as described above, even if the plate thickness tolerance of the head support plate and the dimensional tolerance of the magnetic head are large, the protrusion amount is large. Can be set to a predetermined value.

[0013] By providing the locking means weir to the mounting portion, the adhesive before curing flowing gap between the mounting portion and the head support plate of the magnetic head, the sliding surface of the magnetic head protrudes from said head projecting window It will not adhere.

[0014] If left design without penetrating the positioning holes, adhesive adhered to the back surface of the magnetic head passes through the positioning holes can be prevented from adhering to the jig for positioning.

Further , the damming means is a recess formed in a surface of the mounting portion facing the head support plate,
Also, it may be formed by a convex portion formed on the head support plate and entering the concave portion .

However, the recesses and protrusions are not grooves or ridges but have a small planar shape of a circle, an ellipse, or a rectangle, and these small recesses and / or protrusions are used for mounting the magnetic head. A large number may be alternately arranged from the outer edge side of the portion toward the head protruding window.

[0017]

1 is a side view showing an embodiment of a magnetic head mounting body according to the present invention, FIG. 2 is a partial side view of a magnetic head mounting body according to the present invention, and FIG. Front view seen from the surface side, FIG. 4 is an end view of the magnetic head,
FIG. 5 is a side view of the magnetic head.

In this magnetic head mounting body, the head support plate 12 having the head protruding window 12b of the magnetic head 11 is provided.
Further, the magnetic head 21 is attached from the back surface 12B side. The magnetic head 11 has a shield case 11b projectingly mounted in front of a head base 11a which is a mounting portion projecting laterally.
The front surface of the is a sliding surface 11c with the recording medium.

The sliding surface 11c is inserted into the head projecting window 12b of the head supporting plate 12 from the back surface 12B side, and the sliding surface 11c is projected from the reference surface 12A by a predetermined amount δ, with the head base 11a. The back surface 12B of the head support plate 12 is fixed by an adhesive 14. The protrusion amount δ of the sliding surface 11c from the reference surface 12A is, for example, 0.
The allowable tolerance is about 0.09 mm.

Guide pole holes 12a1 are formed at three locations on the four corners of the head support plate 12, and the elongated holes 12 are provided at one location.
a2 is formed. When the camera is assembled, the guide pole hole and the elongated hole are fitted into a guide pole that also serves as a film guide portion provided inside the opening / closing lid on the back surface of the camera body.

When the magnetic head mounting body is mounted on the camera body, the film serving as a recording medium in the camera body is pressed by the reference surface 12A of the head support plate 12 from the side opposite to the lens. When the film is wound up, the magnetic recording layer formed on the back surface of the film slides on the sliding surface 11c of the magnetic head 11 to read or write data.

In the magnetic head mounting body of the present invention, between the back surface 12B of the head support plate 12 and the front surface (the surface facing the head support plate) of the head base 11a of the magnetic head 11,
A gap Δ is formed.

The amount of protrusion δ of the sliding surface 11c of the magnetic head 11 from the reference surface 12A of the head support plate 12 is set to be a constant value (within a specified tolerance range). However, the plate thickness dimension D of the head support plate 12 has a certain degree of tolerance, and the distance (height) dimension L of the magnetic head 11 from the front surface of the head base 11a to the sliding surface 11c also has a tolerance. There is. These tolerances apply to the head base 11
The gap Δ between a and the back surface 12B of the head support plate 12 is absorbed by being changed.

Therefore, when the magnetic head 11 is assembled to the head support plate 12 and the protrusion amount δ is determined to be a constant value, there is always a gap Δ between the head base 11a and the back surface 12B of the head support plate 12. It is necessary to set each dimension so that the head base 11a and the back surface 12B are just formed or are in close contact with each other. Therefore, it is necessary to set the height dimension L to be equal to or larger than the sum of the maximum value in which the tolerance of the protrusion amount δ is added and the maximum value in which the tolerance of the plate thickness dimension D is added.

Positioning holes 11d and 11d are formed on the front surface of the head base 11a of the magnetic head 11. When the magnetic head 11 is mounted on the head support plate 12, the positioning holes 11d and 11d are fitted with magnetic head mounting reference poles of a jig described later. The positioning holes 11d and 11d are recesses that do not penetrate to the back surface side of the head base 11a.

As shown in FIG. 2, the adhesive 14 is applied from the side end portion 11h of the head base 11a of the magnetic head 11 to the back surface thereof, and the positioning holes 11d and 11d are provided.
Does not penetrate the back surface of the head base 11a, the adhesive agent 14 does not pass through the positioning holes 11d and 11d and flow out to the head support plate 12 side. Therefore, the adhesive adheres to the fitting portion between the magnetic head mounting reference pole and the positioning holes 11d and 11d formed on the jig described later, and the magnetic head mounting reference pole, the magnetic head 11 and the positioning holes 11d and 11d are formed. Can be prevented from being bonded.

Further, in order to prevent the adhesive that has flowed into the gap Δ between the head base 11a and the back surface 12B of the head support plate 12 from flowing into the positioning holes 11d, 11d and the head protruding window 12b, the head base 11a. A damming means is provided at a portion where the head supporting plate 12 and the head supporting plate 12 face each other.

In the magnetic head 11 shown in FIG. 3, the positioning holes 11d and 11d and the head base 11 are provided on the front surface of the head base 11a (the surface facing the head support plate).
Grooves 11f and 11f are formed as recesses between the outer edge of a and the outer edge of a. The grooves 11f, 11f are formed continuously so as to cross the head base 11a serving as the mounting portion in the width dimension, and the grooves 11f, 11f are arcs having the center of the magnetic head 11 as the center of curvature. It is formed along the locus.

Since the grooves 11f, 11f are formed in an arc shape, it is possible not only to prevent the adhesive from flowing into the center side of the magnetic head from the lateral direction in FIG. It is possible to prevent the adhesive from flowing into the center of the magnetic head from the diagonal left and right directions.

Further, as shown in FIGS. 4 and 5, a V-shaped notch 11g is formed at the side end 11h of the head base 11a and at the corner on the rear surface side. When the adhesive 14 is applied from the side end portion 11h to the back surface 12B of the head support plate 12, the adhesive enters the notch portion 11g and is cured, so that the side end portion 11h of the head base 11a is fixed to the head support plate. Can be firmly fixed to 12. The cutout portion 11g is formed by the head base 11
It may have any shape as long as it is formed on the side end portion 11h of a, and may be a groove or the like continuous in the height direction of the head base 11a.

Further, as shown in FIG. 3, the magnetic head 11
The core in the shield case 11b is exposed on the sliding surface 11c of the magnetic gap G by the facing portion of the core.
Are formed. Further, terminals 11e, 11e are projected to the side of the head base 11a, and the winding of the coil provided inside the shield case 11b has the terminal 1e.
It is connected to 1e and 11e.

FIG. 6 is a perspective view showing an assembling method of the magnetic head mounting body of the present invention, and FIG. 7 is a partial sectional view showing the assembling method of the magnetic head mounting body of the present invention. The guide pole holes 12a1 and the elongated holes 12a2 formed in the four corners of the head support plate 12 are fitted with the four reference poles 13a provided on the jig 13, and the jig 13
The position of the head support plate 12 above is determined. At this time, the reference surface 12A of the head support plate 12 is brought into contact with the contact surface 13A of the jig 13. On the contrary, a guide pole is set up on the reference surface 12A side of the head support plate 12, a reference pole hole is formed in the jig 13, and the head support plate 1 is placed on the jig 13.
2 may be positioned.

A pair of magnetic head mounting reference poles 13c, 13c are fixed to the contact surface 13A of the jig 13. After the head support plate 12 is positioned on the jig 13, the magnetic head 11 is moved to the reference surface 12A of the head support plate 12.
The head support plate 12 is mounted from the back surface 12B side opposite to the above.
The head support plate 12 is formed with escape holes 12c and 12c and a head protrusion window 12b for allowing the magnetic head to protrude.

As shown in FIG. 7, when the reference surface 12A of the head support plate 12 is positioned so as to be in close contact with the contact surface 13A of the jig 13, the magnetic head mounting reference pole 13c on the jig 13 is fixed. 13c penetrates the escape holes 12c, 12c of the head support plate 12 and the back surface 1 of the head support plate 12
Appears on the 2B side.

The magnetic head 11 has a shield case 11b.
Is inserted toward the head protruding window 12b of the support plate 12, and the positioning hole 11 formed in the head base 11a.
The magnetic head mounting reference poles 13c and 13d
Fit to c. By this fitting, the contact surface 1 of the jig 13
The position of the magnetic head 11 in a plane parallel to 3A is determined.

Further, the jig 13 is provided with a confirmation window 13b. At the contact surface 13A of the jig 13, the confirmation window 13
A step is formed around b, and a corner between the step and the confirmation window 13b is a receiving portion (abutting portion) 13d of the jig 13.

When mounting the magnetic head 11 from the back surface 12B side of the head support plate 12, the sliding surface 11c of the magnetic head 11 with the recording medium is abutted against the receiving portion 13d.
Thereby, the protrusion amount δ of the sliding surface 11c from the reference surface 12A of the head support plate 12 can be determined.

As described above, since the position of the magnetic head 11 in the z direction is determined by the receiving portion 13d of the jig 13,
A gap Δ is formed between the back surface 12B of the head support plate 12 and the head base 11a of the magnetic head 11.

That is, the sliding surface 11c of the magnetic head 11
When the protrusion amount δ of the head support plate 12 from the reference surface 12A is determined, the gap Δ between the head base 11a of the magnetic head 11 and the back surface 12B of the head support plate 12 changes accordingly. By setting this gap Δ, even if there is a plate thickness tolerance of the head support plate 12 or a tolerance of the dimension L of the magnetic head, the protrusion amount δ can be determined with high accuracy so as to be a specified value. . That is, the tolerance of the protrusion amount δ is determined only by the accuracy of the jig 13.

After positioning the magnetic head 11, an adhesive 14 is applied between the back surface 12B of the head support plate 12 and the side end portion 11h of the head base 11a of the magnetic head 11. As the adhesive 14, for example, a UV curable adhesive is used.

In the method of attaching the magnetic head 11 to the head support plate 12 shown in FIG. 6, both the back surface of the head base 11a and the back surface 12B of the head support plate 12 face upward, so that the head base 11a By applying the adhesive 14 so that it is applied between the head support plate 12 and the head support plate 12,
The magnetic head 11 and the head support plate 12 can be bonded in one step.

Here, the adhesive 1 is attached to the fitting portion between the head base 11a and the magnetic head mounting reference poles 13c and 13c.
It is necessary to prevent the adhesive 4 from entering and prevent the adhesive 14 from flowing into the head protruding window 12b of the head supporting plate 12. As described above, since the positioning holes 11d and 11d of the magnetic head 11 do not penetrate the head base 11a, the magnetic head mounting reference pole 13
It is possible to prevent the adhesive from flowing into the fitting portion with c and 13c.

By the damming means, the adhesive that enters the gap between the head base 11a of the magnetic head 11 and the head support plate 12 is attached to the magnetic head mounting reference pole 13c,
It can be prevented from flowing into the fitting portion of 13c and the head protruding window 12b.

FIG. 8 is a partial sectional view around the groove 11f in the present embodiment. The adhesive 14 that has entered the gap between the head base 11a and the head support plate 12 is blocked by entering the groove 11f and does not flow out to the positioning hole 11d or the head protruding window 12b.

The damming means may be a convex portion 11i formed on the head base 11a, as shown in FIG. The convex portion 11i is similar to the groove 11f in the head base 1
It is a ridge that is formed so as to traverse 1a in the width direction and is preferably formed in an arc shape.

The damming means is the head support plate 12
It may be the groove 12d or the convex portion 12e formed in the. The groove 12d and the convex portion 12e are formed so as to cross the head base 11a attached to the head support plate 12 in the width direction, and are preferably formed in an arc shape.

As shown in FIGS. 10 and 11, the groove 12d and the convex portion 12e formed on the head support plate 12 are formed so as to enter the convex portion 11i and the groove 11f on the head base 11a side. Is preferred. With this structure, the blocking effect of the adhesive 14 is improved. Further, as shown in FIG. 11, it is effective that the groove 11f is formed so as to contact the outer periphery of the positioning hole 11d, and the convex portion 12e to be combined with the groove 11f is formed on the head support plate 12 side.

[0048]

As described above, according to the magnetic head mounting body of the present invention, even if there are tolerances in the thickness of the head supporting plate and / or the dimensional tolerances of the magnetic head, the magnetic head mounting member can be separated from the reference surface of the head supporting plate. The protrusion size of the sliding surface of the magnetic head can be determined with high accuracy. Further, the adhesive can be prevented from flowing into the fitting portion between the magnetic head and the jig and the head protruding window of the head support plate.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a magnetic head mounting body according to the present invention.

FIG. 2 is a partial side view around a magnetic head mounting portion of an embodiment of a magnetic head mounting body according to the present invention.

FIG. 3 is a front view showing an example of a magnetic head that constitutes the magnetic head mounting body of the present invention.

FIG. 4 is a side end view of the magnetic head shown in FIG.

5 is a side view of the magnetic head shown in FIG.

FIG. 6 is a perspective view showing a method of assembling the magnetic head mounting body of the invention.

FIG. 7 is a partial cross-sectional view showing an assembling method of the magnetic head mounting body of the invention.

FIG. 8 is a partial cross-sectional view showing a damming means in the embodiment of the magnetic head mounting body of the invention.

FIG. 9 is a partial cross-sectional view showing another embodiment of the damming means.

FIG. 10 is a partial cross-sectional view showing another embodiment of the damming means.

FIG. 11 is a partial cross-sectional view showing another embodiment of the damming means.

FIG. 12 is a sectional view showing a conventional magnetic head mounting body.

[Explanation of symbols]

11 magnetic head 11a Head base (mounting part) 11b shield case 11c Sliding surface 11d Positioning hole 11e terminal 11f groove 11g cutout 12 Head support plate 12A reference plane 12B back side 12a1 guide pole hole 12b Head protruding window 12c escape hole 13 jigs 14 Adhesive

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akihiro Tsuchiya 1-7 Yukiya Otsuka-cho, Ota-ku, Tokyo Alps Electric Co., Ltd. (56) References JP 10-10638 (JP, A) JP JP 11-259831 (JP, A) JP-A-11-231401 (JP, A) JP-A-11-232622 (JP, A) JP-A-9-211661 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G03B 17/24 GAP G11B 5/49

Claims (5)

(57) [Claims] 1. A head support plate having a reference surface directed to a running portion of a magnetic medium, a back surface facing away from the reference surface, and a head projecting window penetrating and opening between the reference surface and the back surface. a magnetic head having a mounting portion which projects into the sliding surface in a direction parallel to the base has a sliding surface of the recording medium earlier section, the combined magnetic head mounting member, the said mounting portion On the surface facing the head support plate,
Positioning holes on both sides of the sliding surface and this positioning
It is formed at an outer position farther from the sliding surface than the hole.
With concave or convex shaped adhesive blocking means
And the head supporting plate faces the positioning hole.
A through hole is formed, and the sliding surface is installed from the back surface side of the head support plate in a state where the sliding surface appears from the head protruding window to the reference surface side, and the sliding surface projects from the reference surface by a predetermined dimension. A portion of the mounting portion outside the damming means , with a gap formed between the mounting portion and the back surface of the head support plate.
And a back surface of the head support plate fixed with an adhesive. 2. The positioning hole penetrates the mounting portion.
The magnetic head mounting body according to claim 1, which is not provided. 3. The damming means includes a recess formed in a surface of the mounting portion facing the head support plate,
3. The magnetic head mounting body according to claim 1, wherein the magnetic head mounting body is formed by a convex portion formed on the head supporting plate and entering the concave portion. Wherein said damming means, a claim 1 which is formed across said mounting portion of the magnetic head in the widthwise direction
The magnetic head mounting body according to any one of 3 to 3 . 5. The damming means is separated from the sliding surface.
2. A circular arc shape having a convex side directed in the direction of
The magnetic head mounting body according to any one of item 4.