JPH033108A - Erasing head - Google Patents

Abstract

PURPOSE:To improve a workability at the time of joining with a voice head and, simultaneously, to strengthen adhesive strength by providing a recessed part in the approximately central part of a joining surface to the voice head of an erase head, and providing a penetrating part to penetrate from the recessed part to the erase head back part. CONSTITUTION:A recessed part 21 provided in the central part of a joining surface 20a of an erase head 20 has constitution in which a space between an adhesive injecting port 22 provided behind the erase head 20 and the part 21 is communicated with an L-shaped penetrating route 23, and they are integrally molded at the time of molding the resin of an erase head case body. The joining surface 20a and a joining surface 10a of a voice head 10 are joined, the back parts of the voice head 10 and erase head 20 are brought into contact with the external side of the voice head 10 at one edge by using a U-shaped plate spring 12, the other edge is inserted into the adhesive injecting port 22 of the erase head 20, and thereby, both the heads are pinched and positioned. Thereafter, when the adhesive is injected from the adhesive injecting port 22, the adhesive is made to flow through the L-shaped penetrating route 23 into the recessed part 21, and the voice head 10 and erase head 20 are joined with the adhesive.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an erasing head used in a VTR, etc., and relates to joining an audio head whose exterior is made of a case made of permalloy or the like and an erasing head whose exterior is made of a case made of plastic or the like. It is.

(Prior Art) Fig. 3 is a perspective view of a state in which a conventional audio head and erasing head used in a VTR etc. are joined, and Fig. 4 is a sectional view taken along the cutting line A-A in Fig. 3. .

In the figure, 10 is an audio head, 11 is an erasing head,
12 is a spring, and 13 is an adhesive injection hole.

Reference numeral 14 denotes an adhesive filled in the adhesive injection hole 13.

The audio head has a permalloy case and has an eraser head of 11
has a plastic case. These cases incorporate a core equipped with a coil (not shown).

The connection between the audio head 10 and the erasing head 11 will be described below with reference to FIGS. 3 and 4.

First, the joint surface 10a of the audio head 10 and the erasing head 11
After applying adhesive to the joining surface 11a of the sound head 10 and joining them, a substantially U-shaped plate spring 12 having two bent parts 12a and 12b is sandwiched on the back of the audio head 10, and
One bent portion 12a of the spring 12 is inserted into the adhesive injection hole 13 of the eraser pad 11. Next, the audio head 10 and the eraser head 11 are positioned and fixed using a jig (not shown), and the adhesive 14 is injected into the adhesive injection hole 13. After the adhesive 14 is completely cured, the jig is removed and the bonding between the audio head 10 and the erasing head 11 is completed.

(Problem to be Solved by the Invention) As described above, the audio head 10 and the erasing head 11 are fixed using a jig until the adhesive 14 is cured, and left standing until the adhesive 14 is completely cured. In order to maintain the centripetal strength, the audio head 10 and the erasing head 11
rejoining surface, 10a.

It requires work such as applying adhesive to 11a, which reduces efficiency and
There was a problem that workability was poor.

(Means for Solving the Problems) The present invention has been made to solve the above problems, and in an erasing head used in parallel with an audio head, a substantially central portion of the joining surface of the erasing head is provided. It is an object of the present invention to provide an erasing head characterized in that it has a casing structure in which a recessed portion is provided and a through hole is provided that penetrates from the recessed portion to the back of the erasing head.

(Example) FIG. 1 is a perspective view of an erasing head 20 of the present invention, and FIG. 2 is a perspective view of the audio head 10 shown in FIG. 3 and the erasing head 2 shown in FIG. 1.
FIG. 3 is a cross-sectional view showing a state in which the conventional example shown in FIG.

As shown in FIG. 1, the erasing head 20 of the present invention is provided with a concave portion 21 at the center of the bonding surface 20a of the erasing head 20, and the concave portion 21 is provided with an adhesive inlet provided on the back of the erasing head 20. The inlet 22 and the inside of the erasing head 20 are connected by a rectangular adhesive inlet passage 23 penetrating the inside of the erasing head 20 in an L-shape, and these are integrally molded during resin molding of the erasing head housing.

Joining will be explained using FIG. 2.

The joining surface 10a of the audio head 10 and the joining surface 20a of the erasing head 20 are joined, one end of the back of the audio head 10 and the erasing head 20 is brought into contact with the outside of the audio head 10 using the O-shaped plate spring 12, and the other end is brought into contact with the outside of the audio head 10. By inserting the end into the adhesive injection port 22 of the erasing head 20, both heads are clamped and fixed and positioned. Adhesive is injected from the adhesive injection port 22 of the erasing head 20 which has been positioned and fixed by the O-shaped plate spring 12. The injected adhesive flows into the concave portion 21 provided on the joining surface through the L-shaped adhesive inflow path 23, and the audio head 10 and the erasing head 20 are joined with the adhesive.

(Effects of the Invention) As described above, according to the erasing head according to the present invention,
When bonding to the audio head, the adhesive only needs to be injected from the adhesive inlet and flows to the bonding surface, and there is no need to inject adhesive from other parts, improving workability and eliminating recesses on the X bonding surface. By providing a
This makes it possible to provide an erasing head with excellent reliability.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the erasing head of the present invention, Fig. 2 is a sectional view showing a state in which an audio head and an erasing head of the invention are joined, and Fig. 3 is a state in which a conventional audio head and erasing head are joined. FIG. 4 is a sectional view taken along the cutting line A-A in FIG. 3. 10... Audio head, 20... Erasing head, 12.
... Plate spring, 21 ... Recessed part, 22 ... Adhesive inlet, 23 ... Adhesive inflow path.

Claims (1)

[Claims] In an erasing head used in parallel with an audio head, a housing is provided with a concave portion approximately in the center of the joint surface of the erasing head, and a through hole penetrating from the concave portion to the back of the erasing head. An erasing head characterized by having a structure.