JPH0135292Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is based on the dummy block of the holder in order to accurately and reliably bond the dummy block of the head part constituting the magnetic head and the holder in magnetic heads for recording and playback such as V, T, and R. This invention relates to a magnetic head with an improved block mounting surface.

Conventionally, as shown in FIG. 1, the head portion of this type of two-channel magnetic head is attached by attaching glass layers 3, 3 to both sides of the dummy block 1 when bonding it to the holder 2. It is made by adhesively fixing the front cores 5, 5 to which the glass layer 4 is fixed on the outer surface, but since the dummy block mounting surface 2a of the holder 2 is flat, the adhesive is not applied uniformly to the surface. However, the tape running surface of the magnetic head cannot be polished accurately, and the gap depth may not be accurate, causing the front core 5 and dummy block 1 to be stuck at an angle, resulting in deterioration of frequency characteristics. It was hot. In addition, the adhesive oozes out from the adhesive surface between the holder 2 and the dummy block 1, making it difficult to insert and attach the front core 5.

This invention was made in order to solve the above-mentioned drawbacks of the conventional magnetic head, and it is based on the standard between the holder of the head section and the dummy block that constitute a two-channel magnetic head equipped with a control head that performs signal cueing, etc. To provide a magnetic head in which the mounting surface is formed slightly higher than the surrounding resin relief part, and resin relief notches are provided in the middle of both side walls of the holder to ensure adhesive fixation of the holder and the dummy block. It is something.

Hereinafter, one embodiment of this invention will be explained in detail based on FIGS. 2 and 3. In the figure, reference numeral 10 denotes a holder according to this invention, and a reference mounting surface 12 on which the dummy block 1 is stably placed is located on a mounting portion 11 of the dummy block 1 formed to have a concave cross section, so that the reference mounting surface 12 is closer to the surrounding resin relief portion 13. It is formed slightly higher and both side walls 1 of the mounting part 11 are
Seat surfaces 14a and 14b having the same height as the reference mounting surface 12 are formed along the 0a side.

Reference mounting surface 12 and seat surface 1 of the above holder 10
4a and 14b are precisely machined to have a height higher than the base 10b, and the reference mounting surface 12 and the seat surface 14
Dummy block 1 adhesively fixed on a and 14b
It is now possible to polish the tape running surface with high precision.

Further, a resin relief notch 15 is provided in the middle of both side walls 10a of the holder 10, and a seat surface 14 provided along both side walls 10a of the mounting portion 11 is provided.
It is formed at the same height as a and 14b.

Therefore, the holder 10 shaped as described above
In order to adhesively fix the dummy block 1 to the holder 10, as shown in FIG. At the same time, adhesive such as ultraviolet curable resin (UV resin) is injected through the resin relief notches 15 provided on both side walls 10a to securely bond the holder 10 and the dummy block 1. The excess adhesive applied to the reference mounting surface 12 and the seat surfaces 14a and 14b flows into the surrounding resin relief part 13 and does not leak out to the outside, and moreover, the excess adhesive applied to the reference mounting surface 12 and the seat surfaces 14a and 14b does not leak out to the outside. The treated UV resin creates a three-sided adhesive, allowing for a strong adhesive fixation.

As explained above in detail, the magnetic head according to this invention has the reference mounting surface of the holder of the head part constituting the magnetic head slightly higher than the surrounding resin relief part, and the dummy block is mounted along both side walls of the mounting part. The holder has a simple shape with a seating surface at the same height as the standard mounting surface, and a resin relief notch in the middle of both walls of the holder to ensure adhesive fixation between the holder and the dummy block. , dummy blocks can be bonded without the need for special jigs.

Furthermore, since the amount of epoxy thermosetting resin can be reduced, the polishing dimensions of the tape running surface from the base can be accurate, and a magnetic head with excellent frequency characteristics can be obtained.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of a head section showing a conventional embodiment, Fig. 2 is a perspective view of a holder showing an embodiment according to this invention, and Fig. 3 is a sectional view showing an assembled state of the head section according to this invention. It is. 1...Dummy block, 10...Holder, 1
0a... Both side walls, 10b... Base, 11... Mounting part, 12... Reference mounting surface, 13... Resin relief part,
14a, 14b...Seating surface, 15...Resin relief notch.

Claims (1)

[Scope of utility model registration request] Side walls 10a rising on both sides of the base 10b
A dummy block 1 is placed in the center of a holder 10 having a
is fixed with adhesive, and the base 1 is perpendicular to the side wall 10a.
In a two-channel type magnetic head for recording and playback such as a VTR, in which front cores are adhesively fixed to both end faces of the dummy block 1, the reference mounting surface 12 of the holder 10 for mounting the dummy block 1 is slightly smaller than the surrounding resin relief part 13. At the same time, seat surfaces 14a, 1 are installed at the same height as the reference mounting surface 12 along both side walls 10a of the mounting portion 11 of the dummy block 1.
4b, and both side walls 10 of the holder 10
A magnetic head characterized in that a resin relief notch 15 is provided in the middle of a.