JPS60223010A - Magnetic head - Google Patents

Abstract

PURPOSE:To simplify the manufacturing process and also to improve both magnetic characteristics and reliability of a magnetic head, by applying the adhesion of glass to put the ''Sendust(R)'' and a holder together as well as to form a gap. CONSTITUTION:Plural pieces of ''Sendust(R)'' 21 and holders 22 are arranged alternately and adhered to each other with pressure by means of glass 23B. The glass 23B is filled into a groove to obtain a glass layer 23 as well as a block 26. Block pieces 27 and 28 obtained by processing the block 26 are butted to each other with pressure, and the glass 24A is filled into a groove part to obtain a glass layer 24. The block pieces 27 and 28 are put together with the layer 24. Thus a gap, i.e., a core block 29 is formed. Thus blocks 26 and 29 are formed with adhesion of glasses 23B and 24A. This eliminates the problems including the heat resistance, etc. in the manufacturing process. While the tape rubbing surface of a magnetic head is formed with the ''Sendust(R)'' 21, an oxide magnetic material 22B and glasses 24A and 23B. Thus both the wear resistance and magnetic characteristics are improved for the magnetic head.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention aims to fully exploit the high coercive force characteristics of a high coercive force medium (for example, a metal tape).

An alloy magnetic material with high saturation magnetic flux density was used.

The present invention relates to a magnetic head suitable for application to a VTR using a high coercive force medium.

[Conventional technology]

As a magnetic head with a sand-inch structure, the magnetic path spanning the 1,000--P wing surface part and the rear gap part is constructed of sendust, and clamping bodies are bonded to both sides of the sendust. As shown in FIG. 3, there is a clamping body 2 that uses an oxide magnetic material 2B in which glass 2A is molded, and this magnetic head is manufactured by the steps shown in FIG. 3, for example. In other words, the Sendust 1 has a finished track width TW, and the Sendust 1 has a wider width than the Sendust 1.
A plurality of clamping bodies 2 having a high height are arranged alternately and crimped with a predetermined pressure, and an organic adhesive IBi is inserted into the groove 1A formed by Sendust 1 and clamping bodies 2. J, t) At the same time as adhering the sendust 1 and the clamping body 2, the organic adhesive IBi is filled in the groove 1k to form the block 6, and the block 3 is first stacked in the stacking direction (indicated by the dashed line).
Cut into block pieces 4 and 5? First, an upper adhesive reservoir groove 4B, a winding groove 4D, and a rear part reinforcing groove 40t are formed on the gap forming surface 4A of the block piece 4, and the upper adhesive is formed on the gap forming surface 5A of the block piece 5. After forming the agent reservoir groove 5B and the rear part reinforcing groove 50', first finish the gap forming surface 4A of the block piece 4 and the gap forming surface 5Ae of the block piece 5, and apply the snog vine method to the gap forming surfaces 4A and 5A. Gap spacers (not shown) are completely formed by 9. Next, the block pieces 4 and 5 are butted together and crimped with a predetermined pressure, and the upper adhesive reservoir groove 4B is formed.
5B.

An organic adhesive 6 is inserted into the rear reinforcing grooves 40 and 50 to form a core block 7, and then the core block 7 is sliced parallel to the cement dust 1 (as shown by the two-dot chain line) to form the core 8. First, the front part of the core 8 is polished to a depth D of the Ω gap, and the winding 9 is placed in the groove 4D for the winding 9 to form the magnetic head 1,0.
'f: Completed.

[Problem that the invention seeks to solve]

In this prior art, an organic adhesive IB, 6°, for example, an epoxy resin adhesive is used to form the block B by joining the sendust 1 and the clamping body 2, and to form the core block 7°, that is, the gap by joining the block pieces 4.5. Solvent resistance in the post-processing process of joining,
There are problems with heat resistance, etc. In addition, as shown in Fig. 4, Sendust 1. Glass 2A.

Organic adhesive 1B has inferior wear resistance compared to oxide magnetic material 2B
As a result, the layer of organic adhesive 1B is worn away by tape sliding and becomes concave, causing magnetic powder to become embedded or dust to adhere. Damage to the tape.

There is a risk that spacing loss with the magnetic tape will occur due to uneven wear on the tape sliding surface, and the magnetic properties will deteriorate. In order to prevent f'L, the layer of organic adhesive 1B should be made as thin as possible.

When forming block 3, a thin layer of organic adhesive 1B is applied.
And it is difficult to control uniformly.

Furthermore, since the organic adhesives 1B and 6 have water absorbing properties, they are easily affected by the environment and lack reliability after being attached to the video body.

[Means for Solving the Problems] The present invention is not intended to solve the drawbacks of the prior art, and the magnetic head of the present invention has the following advantages: This is done by glass bonding.

[Embodiments of the invention]

The present invention will be explained below based on the drawings.

FIG. 1 is a diagram showing an embodiment of the present invention.

21 is sendust, for example, thermal expansion coefficient 130×10-'/
℃, and its height is the rear reinforcement grooves 27B and 28B.
There is a gap at the upper end.

Reference numeral 22 denotes a clamping body which is joined to both sides of the sendust 21 and holds the sendust 21 therebetween. As the clamping body 22, an oxide magnetic body 22B in which glass 22A is molded f' is used. 1 as glass 22A, for example, thermal expansion coefficient 126
×10-7/°C, and as the oxide magnetic material 22B, for example, Mn-Zn with a thermal expansion coefficient of 125 × 10-7/°C.
Sintered ferrite If is used. Glass 22A is 1, for example 98
Processed at 0°C.

23 is a glass layer that joins the sendust 21 and the clamping body 22, and the glass 23B has a coefficient of thermal expansion of 1, for example, 12.
4X10-'/℃, softening point 500℃, 71
Processed at 0°C.

24 is a glass layer for forming a gap.

For example, the coefficient of thermal expansion is 111 x 10-' as glass 24A.
/°C, with a softening point of 360°C, and was processed at a softening point of glass 23B of 500°C or lower.

A winding 25 is provided in the groove 270 for the first winding.

The magnetic head of the present invention is manufactured through the following steps.

First, Sendust 21 finished with track width TW
Then, a plurality of clamping bodies 22, which are wider than the Sendust 21 and taller than the Sendust 21 and taller, are arranged alternately and crimped with a predetermined pressure, and the glass 23Bt is inserted into the groove 23A formed by the Sendust 21 and the clamping body 22. , the Sendust 21 and the clamping body 22 are bonded together by penetration of the glass 23B, and the glass 23 is inserted into the groove 23A.
The glass layer 23 is formed by filling with B.

A block 26 is formed. Since the height of the Sendust 21 is low, the glass 2.5B easily penetrates and spreads over the entire surface of the Sendust 21 in contact with the holding body 21A.

Next, the block 26 is cut in the stacking direction C (indicated by a dashed line) into block pieces 27, 28? Form.

Next, a first winding groove 270 and a rear part reinforcing groove 27B are formed on the gap forming surface 27A of the ratchet block piece 27, and a rear part reinforcing groove 288t is formed on the gap forming surface 28A of the block piece 28. Rear part reinforcement groove 27B,
The height of 28B is made the same as the height of groove 23A.

Next, the gap forming surface 27A of the block piece 27 and the gap forming surface 28A of the block piece 28 are completely finished, and the gap forming surface 27A is finished.

A gear spacer (not shown) is formed on 28A by the snow groove method.

Next, butt against block pieces 27 and 28'.

The glass layer 24 is formed by crimping with a predetermined pressure and inserting the glass 2dA into a part of the first winding groove 270 and the rear reinforcement grooves 27B and 28B. By forming the glass layer 24, the block pieces 27, 28 are joined together and a gap is formed, ie, a core block 29 is formed.

Next, the core block 29 is sliced parallel to the sendust 21 (as shown by the two-dot chain line) to form the core 30.

Next, the front part of the core 30 is polished to a predetermined gap depth,
If the winding 25 is attached to the core 60.

The magnetic head 61 is completed.

〔Effect of the invention〕

In this invention, since the block 26 and the core block 29 are formed by adhering the glasses 23B and 2'4A, there are no problems such as heat resistance during the manufacturing process, and tape sliding The surface is Sendust 21. as shown in FIG. Since it is made of oxide magnetic material 22B and glass 2.24.23B, it has good wear resistance, improved magnetic properties, and is less susceptible to environmental influences.
〈Reliability is also improved.

As explained above, the present invention has the advantage that by bonding the sendust and the clamping body and forming the gap by glass bonding, the manufacturing process is simplified and the magnetic properties and reliability can be improved. is obtained.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention, and is a diagram showing a magnetic head according to the invention and its manufacturing process, FIG. 2 is an enlarged view of the tape sliding surface in this invention, and FIG. 3 is a conventional FIG. 4 is an enlarged view of a tape sliding surface in the prior art. 21... Sendust, 22... Clamping body, 23.24
...Glass layer, 25... Winding wire

Claims (1)

[Scope of Claims] 1. A magnetic spatula in which the magnetic path from the front gap part including the tape sliding surface to the rear gap part is made of sendust, and a sandwich structure is formed by joining sandwiching bodies to both sides of the sendust. In F. A magnetic head characterized in that the bonding and gap formation between the sendust and the sandwiching body are performed by glass bonding.