JPH0447767Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a composite magnetic head in which two magnetic heads are integrated, and particularly to a structure of a composite magnetic head suitable for miniaturization.

``Prior Art and its Problems'' For example, an audio head and an erase head used in a VTR are used as an integrated composite magnetic head. Conventionally, this composite magnetic head is shown in Fig. 4.
It had an integrated structure as shown in FIG. 1
1 and 12 are a first magnetic head (audio head) and a second magnetic head (erase head), respectively. The first magnetic head 11 has a metal shield case 13, and has an audio head core 14 and a control head core. 15 are exposed at the top and bottom of the front. On the other hand, the second magnetic head 12 has a hold case 16 made of synthetic resin, and its erase head core 1
7 is exposed at the front.

The two magnetic heads 11 and 12 are assembled separately and fixed after positioning each core with respect to the tape. For this fixing, as shown in FIG.
This is done by screwing the fixing screw 20 inserted through the hole 19 into the screw hole 19. Note that in FIG. 5, illustrations of elements within the magnetic heads 11 and 12 are omitted.

Two magnetic heads 1 fixed in this way
1 and 12 are further covered with a shield cover 21. The shield cover 21 shields external magnetic fields and prevents magnetic heads 11 and 12 from being adversely affected. This shield cover 21 has a box-like shape with the front and bottom sides open, and has a screw through hole 22 formed in its top surface, and a screw hole 23 formed in the shield case 13 of the magnetic head 12. has been done. 24
is a terminal protrusion hole provided on the back surface of the shield cover 21. A fixing screw 25 is inserted into the screw through hole 22 of the shield cover 21, and the fixing screw 25 is screwed into the screw hole 23, so that the shield cover 21 wraps around the magnetic heads 11 and 12. , 12.

By the way, in order to meet the recent demands for the composite magnetic head to be lighter, thinner, shorter and smaller, there is a tendency to reduce the overall size and the thickness of the shield case 13 at the same time. However, when the thickness of the shield case 13 is reduced, it becomes difficult to make tap holes such as the screw holes 19 and 23, and it becomes difficult to ensure the mounting strength of the shield case 13 and the shield cover 21. . In addition, this conventional composite magnetic head has a problem in that the assembly workability is poor because the first magnetic head 11 and the second magnetic head 12 are fixed, and the second magnetic head 12 and the shield cover 21 are fixed with screws. There is also.

``Purpose of the invention'' In view of the problems of conventional composite magnetic heads, the present invention aims to provide a high-mounted magnetic head that can be mounted on two magnetic heads and a shield cover attached thereto without using screw connections. The object is to obtain a magnetic head that can be integrated with strength.

``Summary of the invention'' In the composite magnetic head of the invention, two magnetic heads are fixed with a step provided in the vertical direction, and an opening is provided on the top wall of the shield cover from which the magnetic head with the step provided upward protrudes. The shield cover is characterized in that the two magnetic heads and the shield cover are fixed with an adhesive or an adhesive resin in a state in which a step surface between the open part and the magnetic head is engaged with each other. If only fixed with adhesive, there is a risk that the connected magnetic head and shield cover may separate, and it is difficult to increase the strength of the attachment between the two.
As in the present invention, if the vertical step provided between the two magnetic heads is engaged with the open part of the top wall of the shield cover, sufficient mounting strength can be obtained by fixing with adhesive or resin. can.

``Embodiments of the invention'' The invention will be described below with reference to illustrated embodiments. 1 to 3 show embodiments of the present invention,
Components that are the same as those of the conventional device shown in FIGS. 4 and 5 are given the same reference numerals. The first magnetic head 11 and the second magnetic head 12 are assembled separately as in the past, and the dimensions are designed so that the magnetic head 12 protrudes above the magnetic head 11 by a step d when properly aligned. has been done. 31 indicates a stepped surface formed by this step d.

The shield cover 21 that is attached to the magnetic heads 11 and 12 has at least an upper wall surface 32, and a portion of the upper wall 32, on the second magnetic head 12 side, is an open portion 33. The planar size of this open portion 33 corresponds to the planar size of the protruding surface of the second magnetic head 12, and one end surface side of the open portion 33 has a regulating surface that engages with the step d. 34. Further, on the front part of the regulating surface 34, there is a retaining part 3 that engages with the upper end of the front surface of the second magnetic head 12.
5 is formed. The shield cover 21 further includes a rear wall 36 and a side wall 37.
A terminal protrusion hole 38 is formed in the. The side wall 37 is in contact with the side surface of the second magnetic head 12, and a fixing resin injection hole 39 is bored in a part thereof. A portion of the shield cover 21 corresponding to the side surface of the first magnetic head 11 is not provided with a wall.

This composite magnetic head consisting of the above components is
As described above, the magnetic heads 11 and 12 are first positioned and temporarily fixed using adhesive. Next, the shield cover 21 is placed over the magnetic heads 11 and 12, the second magnetic head 12 is made to protrude from the open part 33 of the shield cover 21, and the regulating surface 34 is aligned with the step surface 3.
1 and position it. At this time, the rear surfaces of the magnetic heads 11 and 12 abut against the rear wall 36 of the shield cover 21, and the side surfaces of the second magnetic head 12 abut against the side walls 37, respectively. Terminals 40 and 41 of magnetic heads 11 and 12 respectively protrude to the outside from terminal protrusion holes 38 in side wall 37. In this state, the magnetic heads 11 and 12 and the shield cover are correctly positioned.

In this state, next, a fixing resin 42 is applied or injected onto the abutting joint surface between the stepped surface 31 and the regulating surface 34 between the magnetic heads, and into the resin injection hole 39, as shown in FIG. Then, the magnetic heads 11 and 12 and the shield cover 21 are connected to the step surface 31.
By the engagement of the regulating surface 34 with the regulating surface 34, the lateral movement is fixed while being regulated. Also, the vertical movement is
The fixing resin 42 enters through the resin injection hole 39 and is bonded to the side wall of the magnetic head 12 through the resin injection hole 39.
Since the magnetic heads 11 and 12 and the shield cover 21 are fixed by sufficient fixing strength in the vertical and horizontal directions, the magnetic heads 11 and 12 and the shield cover 21 are fixed with sufficient fixing strength in the vertical and horizontal directions. The retaining portion 35 prevents the magnetic heads 11 and 12 from coming off to the front of the shield cover 21. Note that the fixing resin 42 exhibits adhesive strength regardless of whether the material of the case of the second magnetic head 12 is synthetic resin or metal.

When applying or injecting the fixing resin, the fixing resin can also be injected into the gap between the shield cover 21 and the magnetic heads 11 and 12 from below the shield cover 21, if necessary.

After the above fixing work is completed, terminals 40 and 41
The printed circuit board 45 is connected to. This connection is made by inserting the terminals 40 and 41 into the terminal holes 46 of the printed circuit board 45 and soldering them in this state. Furthermore, a mounting plate 47 is fixed to the lower surface of the magnetic heads 11 and 12 with fixing screws.
The assembly work of the composite magnetic head is completed. Mounting plate 4
Reference numeral 7 indicates a fixing screw hole 48 to facilitate installation of this composite magnetic head to the set chassis.
is worn.

The locations where the adhesive or resin is applied or injected to fix the magnetic heads 11 and 12 and the shield cover 21 are not limited to the embodiments. Any location is sufficient as long as both can be fixed effectively. Further, the fixing resin injection hole 39 can be formed without forming it.
The magnetic heads 11, 1 can be moved only by the step 31 and the regulating surface 34.
2 and the shield cover 21, but if formed, the same fixing effect can be obtained by forming it not only on the side wall 37 but also on the top wall 36.

"Effects of the Invention" As described above, in the composite magnetic head of the present invention, the two integrated magnetic heads and the shield cover attached thereto engage with each other at the step between the magnetic heads and the open part of the shield cover. Therefore, sufficient mounting strength can be obtained by simply fixing the two together with adhesive, without using screws like in conventional products. Therefore, it is suitable as a structure for fixing two magnetic heads and a shield cover when making a composite magnetic head lighter, thinner, shorter and smaller.

By simply engaging the step between the open end of the upper wall of the shield cover and the magnetic head, the shield cover and the composite magnetic head are placed in a position where the noise of the first magnetic head generated on the upper wall of the shield cover is reduced. can be easily positioned,
In particular, even if the shield cover has a small wall surface, it is easy to assemble the shield cover and the composite magnetic head at the above noise reduction position.

In addition, in the present invention, since it is only necessary to provide an opening on the upper wall surface of the shield cover, the precision of the alignment between the composite magnetic head and the shield cover can be achieved simply by adjusting the opening, and the manufacture of the shield cover is easy. It is.

Furthermore, if a fixing resin injection hole is further drilled in the side surface of the shield cover and the resin injected through the hole is adhered to the side surface of the magnetic head, the mounting strength can be further increased.

And since it has a fixed structure that does not use screws,
Good assembly workability.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of the magnetic head and shield cover showing an embodiment of the composite magnetic head of the present invention, and Fig. 2 shows the place where adhesive resin is applied or injected to the shield cover attached to the magnetic head. Figure 3 is a perspective view of the assembled state;
The figure shows an example of a conventional composite magnetic head, and is a perspective view of a magnetic head and a shield cover in an exploded state, and FIG. 5 is a cross-sectional view of two magnetic heads in a connected state. DESCRIPTION OF SYMBOLS 11...First magnetic head, 12...Second magnetic head, 21...Shield cover, 31...Step surface, 33...Open portion, 34...Restriction surface, 35...
Retaining portion, 36...rear wall, 37...side wall,
38... Terminal protrusion hole, 39... Fixing resin injection hole.

Claims (1)

[Claims for Utility Model Registration] (1) In a composite magnetic head in which two magnetic heads are fixed and a shield cover having at least a top wall and a rear wall is attached and fixed to the fixed magnetic heads, the two magnetic heads are The shield cover is fixed with a level difference in the vertical direction, and an open part from which the magnetic head protrudes, which has a level difference in the upward direction, is formed on the upper wall of the shield cover, and the stepped surface between the open part and the magnetic head is engaged. 1. A composite magnetic head characterized in that these two magnetic heads and a shield cover are fixed with an adhesive or an adhesive resin in a state in which the two magnetic heads and a shield cover are held together. (2) Scope of Utility Model Registration Claim Paragraph 1 provides that the shield cover is provided with a side wall or a rear wall that comes into contact with the side or rear surface of the magnetic head,
This composite magnetic head has an injection hole for fixing resin in the side wall or rear wall. (3) In claim 1 or 2 of the utility model registration claim, it is stated that the upper wall of the shield cover is provided with a retaining part that comes into contact with the upper front surface of the protruding magnetic head from the end face of the open part. Features a composite magnetic head.