JPH11316924A - Fitting structure of magnetic head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple fitting structure of the magnetic head which positions the magnetic head with precision (azimuth, tilt, oscillation, core height, etc.), about a fitting plate. SOLUTION: The metallic fitting plate 32 is provided with a bent piece 32a, the bent piece 32a is inserted into the join part formed by joining the flank 26a of a 1st magnetic head 22 and the flank 28a of a 2nd magnetic head 23, and an adhesive is charged between the join part and bent piece 32a to fix the 1st and 2nd magnetic heads 22 and 23 to the fitting plate 32. Consequently, the magnetic head and fitting plate can be fitted very tightly. The bent piece can be erected precisely at right angles to the fitting plate since the fitting plate is punched with a punch and bent to form the bent piece. The magnetic head is fitted on the basis of the bent piece to accurately set the azimuth of the magnetic head.

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 structure, and more particularly to a magnetic head mounting structure in which a magnetic head composed of a composite such as a voice / control head for a VTR and an erasing head is mounted on a mounting plate.

[0002]

2. Description of the Related Art FIG. 7 is a front view showing a conventional magnetic head mounting structure of this type. The magnetic head 1 has a voice /
It is composed of a composite of a first magnetic head 2 composed of a control head and a second magnetic head 3 composed of an erasing head. The first magnetic head 2 is such that a head core 4 for sound and a head core 5 for control are inserted into a shield case 6 made of a magnetic metal such as permalloy with a predetermined interval in the width direction of the magnetic tape. 6
Gap portions 4a and 5a of the cores 4 and 5
And a front plate 7 made of an abrasion-resistant material such as stainless steel is provided on the sliding surface of the tape between the cores 4 and 5. In the second magnetic head 3, the erasing head core 9 is inserted into a synthetic resin case 8, the gap 9 a of the core 9 is exposed on the sliding surface of the tape, and the case 8 is filled with resin. Configuration, or
The head core 9 is directly formed integrally with a molding resin.

The first and second magnetic heads 2 and 3
The magnetic head 1 is provided with a shield cover 10 made of permalloy or the like on the upper surface of the magnetic head 1 by abutting the side surfaces of the cases 6 and 8 with good positional accuracy and joining them with an adhesive, a screw or the like (not shown). 11 is formed.

Next, as a structure for mounting the magnetic head 1 to the mounting plate 12, a through hole 12a is provided in the mounting plate 12 made of a rolled steel plate or the like, and an opening is formed in the bottom of the shield case 6 of the first magnetic head 2. A burring tap 13a of a collar member 13 made of stainless steel or the like previously inserted into the shield case 6 is formed through the opening 6a, and a tip of the burring tap 13a is partially inserted into the through hole 12a of the mounting plate 12. insert. Opening 13b of burring tap 13a
Is formed with a female screw. A male screw 14 is inserted into the through hole 12a from the back surface of the mounting plate 12, and a burring tap 13 is formed.
It is attached by screwing into the female screw of a.

[0005] Another conventional magnetic head mounting structure will be described with reference to FIG. In FIG. 1, only the first magnetic head 2 is shown, omitting the second magnetic head 3. On the surface of the mounting plate 15, four protrusions 15a are provided in advance. The bottom surface of the shield case 6 of the first magnetic head 2 provided with the audio head core 4 and the control head core 5 is placed on the projection 15a of the mounting plate 15. Next, using a resistance welding device, one electrode 16 of the device is brought into contact with the mounting plate 15 from the back side of the projection 15a, and the other electrode 17 is brought into contact with the upper surface of the shield case 6. In this state, a current flows while the electrodes 16 and 17 are pressed against the first magnetic head 2. As a result, the four protrusions 15a are heated and melted, so that the first
The bottom surface of the magnetic head 2 and the mounting plate 15 are welded and mounted.

[0006]

However, in the conventional magnetic head mounting structure, in the case of screwing, a collar member 13 having a female thread and a male screw 14 for fixing the female member are required. However, there are problems that the number of parts increases, the cost increases, and the assembling work is troublesome. In addition, in the case of welding, variations are likely to occur in the melting of the four protrusions 15a,
Therefore, there is a problem that the adhesive strength between the magnetic head and the mounting plate 15 varies. Furthermore, there is a disadvantage that the electrical and mechanical adjustment of the resistance welding apparatus and its maintenance are complicated. Further, in any of the above mounting structures, the positioning (azimuth, tilt, swing, core height, etc.) of the magnetic head with respect to the mounting plate 12 or 15 is not accurately determined, and the magnetic head is connected via the mounting plate 12 or 15. There is a problem that the position (posture) of the magnetic head must be adjusted when the magnetic head is attached to the device. The present invention has been made in view of the above problems, and has as its object to provide a magnetic head mounting structure with a very simple structure and high positional accuracy.

[0007]

According to the magnetic head mounting structure of the present invention, a bent piece is provided on a metal mounting plate, and the side surface of the first magnetic head and the side surface of the second magnetic head are joined. The bent portion is inserted into the joint, an adhesive is filled between the joint and the bent portion, and the first and second magnetic heads are fixed to the mounting plate. . Therefore, the metal-made bent piece inserted in the joint becomes an attachment structure embedded in the adhesive. The magnetic head is mounted on the basis of the bent piece.

Further, the mounting structure of the magnetic head of the present invention comprises:
A concave portion is provided on a side surface of the second magnetic head, the bent piece is inserted into the concave portion, and the adhesive is filled in the concave portion. Therefore, just insert the bent piece into the recess,
The positioning between the mounting plate and the magnetic head is facilitated.

Further, the mounting structure of the magnetic head of the present invention comprises:
Two bent pieces are provided to face each other, the first magnetic head is positioned between the two bent pieces, and one bent piece is attached to the joint portion and the other bent piece is placed. Are provided on the other side surface of the first magnetic head, respectively, and an adhesive is filled between the other bent piece and the other side surface.

[0010] The mounting structure of the magnetic head of the present invention comprises:
The bottom of the first magnetic head is floated with a gap from the surface of the mounting plate, and the gap is filled with an adhesive. Therefore, the height at which the magnetic head is mounted on the mounting plate can be adjusted and fixed.

Further, the mounting structure of the magnetic head according to the present invention comprises:
The bent piece is formed by cutting and raising a part of the mounting plate and thinly extending the sheet by drawing. Therefore, the bent piece can be made thin and long.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an exploded perspective view of an essential part showing an embodiment of a magnetic head mounting structure according to the present invention. , An opening 32a and a pair of bent pieces 32b and 32c facing each other are provided. The bent piece 32b,
As shown in FIGS.
A mounting plate 32 having a thickness of 2 mm is placed on a mold 33. As a first step, the mounting plate 32 is punched from above by a punch A in FIG. , 32c '. Thereafter, as a second step, a punch B having a larger diameter than the punch A in FIG.
, Drawing process is performed on the bent portions 32b 'and 32c', and the thinned portions 32b and 32b are stretched thinly to a thickness of approximately 0.5 mm.
32c. In addition, as a method of forming a bent piece, instead of providing a pair of bent pieces 32b and 32c at a time so as to open a window on both sides of one opening 32a, as shown in FIG. Two openings 32
Bent pieces 32b and 32c may be provided at one end of each of e and 32e so as to be opposed to each other, or may be arbitrarily selected according to the shape of the mounting plate 32. In particular, the bent piece 32
In a structure in which one of the bent pieces 32b or 32c of b and 32c is formed on the peripheral portion 32g of the base 32f of the mounting plate 32, the bent piece cannot be provided unless the forming method is cut out from the outside.

Next, of the magnetic heads 21 of the present invention, a first magnetic head 22 comprising a voice / control head
As in the conventional example, a head core 24 for audio and a head core 25 for control are inserted into a shield case 26 made of a magnetic metal such as permalloy at a predetermined interval, and the tape slide of the shield case 26 is performed. The gap portions 24a, 25a of the cores 24, 25 are exposed on the contact surface,
Further, a front plate 27 made of an abrasion-resistant material is provided on the sliding surface of the tape between the cores 24 and 25. In the second magnetic head 23 composed of an erasing head, an erasing head core 29 is inserted into a synthetic resin case 28, a gap portion 29a is exposed on a tape sliding surface, and a tape sliding surface is further provided. Is formed by attaching a wear-resistant sliding plate 36 made of non-magnetic ferrite or the like. Also, a side surface 28 a of the case 28 on the side facing the first magnetic head 22.
Has a recess 28c extending from the bottom toward the center. The head core 29 of the second magnetic head 23 is for erasing the audio track recorded by the head core 24 of the first magnetic head 22. Then, the first magnetic head 22 and the second magnetic head 23 are positioned so that the positional relationship between the corresponding head cores 24 and 29 is accurately determined. Side 2
8a are butted against each other and joined by an appropriate means (not shown) such as an adhesive.

Next, the shield cover 30 made of permalloy or the like is composed of a back plate 30a, a pair of side plates 30b and 30c bent at substantially right angles from the back plate 30a, and an upper plate 30d. A pair of side plates 30
b and 30c are pressed against the outer side surfaces 26b and 28b of the first and second magnetic heads 22 and 23, respectively, and the upper plate 30d is attached to the first and second magnetic heads 22 and 23.
And mounted on both magnetic heads 22, 23. The shield cover 30 is fixed to the first and second magnetic heads 22 and 23 by filling an adhesive 31 through a hole 30e provided in the upper plate 30d, and the magnetic head 21 made of a composite is formed. The terminals 22a and 23a of the first and second magnetic heads 22 and 23 protrude outward from holes 30f provided in the back plate 30a.

As shown in FIG. 4, the mounting structure of the magnetic head 21 to the mounting plate 32 is such that one bent piece 32b of the mounting plate 32 is attached to the side surface of the second magnetic head 23 from the bottom side of the magnetic head 21. The magnetic head 21 is inserted into the concave portion 28c provided in the first magnetic head 22 so as to sandwich the outer side surface 26b of the first magnetic head 22 between the one bent piece 32b and the other bent piece 32c. Place on. And the recess 28
c, the first magnetic head 22 and the other bent piece 32c
And the bottom of the first magnetic head 22 and the mounting plate 32
Is securely fixed by filling an adhesive (not shown) such as an epoxy resin with the surface of the substrate.

According to the above mounting structure, the bent pieces 32b, 3b
2c can be accurately erected perpendicularly to the surface of the mounting plate 32 by bending drawing. Since the magnetic head 21 can be mounted on the basis of the bent pieces 32b and 32c, the azimuth angle of the magnetic head 21 can be reduced.
That is, the head cores 24, 2 of the first magnetic head 22
The direction of the gap portions 24a and 25a (the direction of arrow Z in FIG. 4) can be accurately set perpendicular to the surface of the mounting plate 32. As shown in the side view of the present embodiment in FIG. 5, when the magnetic head 21 is mounted, the side end surface 32d of the one bent piece 32b inserted into the concave portion 28c of the second magnetic head 23 is The tilt angle of the magnetic head 21, that is, the angle between the surface of the mounting plate 32 and the tape sliding surface of the magnetic head 21 is set to be a right angle by positioning the magnetic head 21 in contact with one inner wall 28 d of the magnetic head 21. Can be.
In addition, the total length X from the rear end face of the mounting plate 32 to the tape sliding surface of the magnetic head 21 can be simultaneously and accurately set. Further, in FIG.
While the core height H of the magnetic head 22 up to the control head 25 is set to a predetermined value in advance, the surface of the mounting plate 32 and the bottom of the first magnetic head 22 are fixed with resin while floating. Therefore, the core height H can be set with high accuracy. Preferably, if the magnetic head 21 is fixed while being held (temporarily held) between the pair of bent pieces 32b and 32c, the resin can be fixed without using a special holding jig or the like in manufacturing. .

As shown in the top view of this embodiment in FIG. 6, the magnetic head 21 swings with respect to the mounting plate 32.
In other words, the magnetic head 21 is mounted by aligning the side surfaces 26a and / or 26b of the first magnetic head 22 with the surfaces of the bent pieces 32b and 32c in the direction perpendicular to the tape sliding surface of the magnetic head 21. It is possible to accurately turn the front of the plate 32 in a predetermined direction (arrow Y) without tilting.

[0018]

As described above, in the magnetic head mounting structure of the present invention, a bent piece is provided on a metal mounting plate, and the side surface of the first magnetic head and the side surface of the second magnetic head are joined. The bent piece is inserted into the joined portion, an adhesive is filled between the joined portion and the bent piece, and the first and second magnetic heads are fixed to the mounting plate. In addition, since the mounting structure is such that a bent piece made of a metal plate is buried with an adhesive as a support, the magnetic head and the mounting plate can be mounted very firmly. In addition, since the bent piece is formed by bending the mounting plate by punching with a punch or the like, it can be erected vertically with high accuracy on the mounting plate. By mounting the magnetic head, an effect that the azimuth of the magnetic head can be accurately set is achieved. Furthermore,
In mounting the magnetic head to the device, no adjustment is required and the mounting becomes easy.

Further, the mounting structure of the magnetic head of the present invention is as follows.
A concave portion is provided on the side surface of the second magnetic head, the bent piece is inserted into the concave portion, and the adhesive is filled in the concave portion. Positioning can be performed by abutting the side end surface of the bent piece and the inner side wall of the concave portion. Therefore, the tilt angle of the magnetic head and the total length from the rear end surface of the mounting plate to the tape sliding surface of the magnetic head can be accurately determined. It has an effect that can be set.

Further, the mounting structure of the magnetic head of the present invention is as follows.
Since the two bent pieces are provided to face each other and the first magnetic head is positioned and mounted between the two bent pieces, the mounting strength is further improved and stabilized. Can be. Further, in the manufacturing process, the magnetic head can be bonded while being held (temporarily held) between the pair of bent pieces, so that the position can be easily adjusted.

Further, the mounting structure of the magnetic head of the present invention comprises:
Since the bottom of the first magnetic head is in a floating state with a gap from the surface of the mounting plate and the gap is filled with an adhesive, from the back surface of the mounting plate to the head core of the first magnetic head. With the height of the magnetic head adjusted and set to a predetermined value, the magnetic head can be fixed while floating on the mounting plate, and the adjustment of the core height when attaching the magnetic head to the device can be performed. It becomes unnecessary. In this case, if the magnetic head is sandwiched (temporarily held) between the pair of bent pieces, the adjustment becomes easier.

Further, the mounting structure of the magnetic head of the present invention comprises:
The bent piece is formed by cutting and raising a part of the mounting plate and stretching it thinly by drawing, so that the length of the bent piece protruding from the surface of the mounting plate can be increased, and the magnetic head Holding can be stabilized. In addition, since the bent piece can be made thin, the amount of protrusion outside the side surface of the first magnetic head can be suppressed, and the effect of contributing to a reduction in size as a whole can be achieved.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a main part showing a mounting structure of a magnetic head according to the present invention.

FIG. 2 illustrates a method of processing the mounting plate of the present invention.
Fig. A is an explanatory diagram of the bending process, and Fig. B is an explanatory diagram of the drawing process.

FIG. 3 is a perspective view showing another processing structure of the mounting plate of the present invention.

FIG. 4 is a front view of a magnetic head mounting structure according to the present invention.

FIG. 5 is a side view showing a mounting structure of the magnetic head of the present invention.

FIG. 6 is a top view showing a magnetic head mounting structure according to the present invention.

FIG. 7 is a fragmentary front view showing a conventional magnetic head mounting structure.

FIG. 8 is a front view for explaining another conventional magnetic head mounting structure.

[Description of Signs] 21 Magnetic head 22 First magnetic head 23 Second magnetic head 26 Shield case 26a, 26b Side surface 28 Case 28a, 28b Side surface 28c Concave portion 32 Mounting plate 32b, 32c Folded piece

Claims (5)

[Claims] 1. A bent piece is provided on a metal mounting plate, and the bent piece is inserted into a joining portion where a side surface of a first magnetic head and a side surface of a second magnetic head are joined. A mounting structure for a magnetic head, wherein an adhesive is filled between a portion and the bent piece to fix the first and second magnetic heads to the mounting plate. 2. The magnetic head according to claim 1, wherein a concave portion is provided on a side surface of the second magnetic head, the bent piece is inserted into the concave portion, and the adhesive is filled in the concave portion. Mounting structure. 3. The apparatus according to claim 2, wherein the bent pieces are provided to face each other.
The first magnetic head is positioned between the plurality of bent pieces, and one bent piece is disposed on the joint portion, and the other bent piece is disposed on the other side surface of the first magnetic head. 3. The magnetic head mounting structure according to claim 1, wherein an adhesive is filled between the other bent piece and the other side surface. 4. The apparatus according to claim 1, wherein the bottom of the first magnetic head is floated with a gap from the surface of the mounting plate, and the gap is filled with an adhesive.
The mounting structure of the magnetic head described in the above. 5. The magnetic head according to claim 1, wherein the bent piece is formed by cutting and raising a part of the mounting plate and thinly extending it by drawing. Mounting structure.