JPS62229505A - Magnetic head - Google Patents

Abstract

PURPOSE:To improve the magnetic characteristic by using a glass with high wear resistance for a glass part near a track forming a tape slide face and using an adhering glass having a lower softening point than that of the glass for the peripheral of the rear butted part. CONSTITUTION:A couple of magnetic blocks, 11a, 11b are subjected to mirror finish and a trapezoidal winding slot 12 and a square glass slot 18 are formed on the opposed face along the lengthwise direction. Further, plural upper glass slots 7a, 7b and regulating slots 10a, 10b connected to them are formed to the opposed face of the both in the lengthwise direction. Moreover, a nonmagnetic substance such as SiO2 is formed to any upper face of the block, the regulating slots 10a, 10b forming a track width TW are butted so as not to be deviated, a glass rod 15 having a high wear resistance is inserted in the slots 7a, 7b so as to be given in the regulating slots 10, and a glass rod 16 having a low softening glass rod 16 is inserted to the rear slot 18 and heated, then both the glass rods 15, 16 are molten to adhere both the blocks 11a, 11b. After the tape sliding part of the blocks is processed into a uniform round by the cylindrical cutting or the like, the result is sliced into a prescribed thickness.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention is directed to a video recorder (hereinafter referred to as V
The present invention relates to a magnetic head used in magnetic recording/reproducing devices such as TR.

(Prior Art) FIG. 7 is a perspective view of a conventional magnetic head, FIG. 8 is a perspective view showing its manufacturing process, and FIG. 9 is a plan view showing its track width. In general, magnetic heads for VTRs, etc., have two magnetic core blocks xa and xb made of ferrite, etc., polished to a mirror finish, as shown in FIGS. 7 to 9, and these magnetic core blocks 1a and 1b are Winding groove 2, glass groove 8
% After processing the track width regulating groove 10, a glass rod i is inserted into the glass groove 8 through a predetermined gap g, and the track width regulating groove 10 regulates the track width TW (Fig. 9).
Make the glass flow. Then, a certain pressure is applied and heated in a heating furnace to melt the glass rod 5 and join the dynamic magnetic core blocks 1a and 1b together to form an adhesive block. By slicing this adhesive block into a predetermined shape, a magnetic head as shown in FIG. 7 is obtained.

However, in the conventional magnetic head manufacturing method described above, in order to flow the glass rod 5 placed on the glass f148 up to the vicinity of the sliding surface, high temperature treatment is required, which activates the glass and causes mutual diffusion with the ferrite. occurs, and
The ferrite is etched by high temperature and the gap forming surface becomes rough.

For this reason, there is a problem in that the magnetic head characteristics deteriorate and it is difficult to manufacture a magnetic head with uniform magnetic characteristics.

(Problems to be Solved by the Invention) This invention solves the problems of the above-mentioned prior art, in that the gap forming surface becomes rough, the magnetic head characteristics deteriorate, and it is difficult to manufacture a magnetic head with uniform magnetic characteristics. It is an object of the present invention to provide a magnetic head that can have a simple configuration, has improved magnetic properties, has wear resistance, and is easy to manufacture.

[Structure of the invention]

(Means for Solving the Problem) The magnetic head of the present invention uses highly abrasion-resistant glass for the glass portion near the track that forms the entire tape moving surface.
Adhesive glass, which has a lower softening point than this glass, is used around the abutting part at the rear.

(Function) This invention uses glass with a low softening point to firmly adhere a pair of magnetic heads, and the tape sliding surface uses glass with high wear resistance, so the tape does not slide easily. It also prevents wear and improves magnetic properties.

(Embodiments) Hereinafter, embodiments of the magnetic head of the present invention will be described based on the drawings. FIG. 1 is a perspective view of a magnetic head chip of one embodiment, and FIG. 2 is a perspective view for explaining the manufacturing process thereof.

In both Figures 1 and 2, Figures 7 to 9
Components that are the same as those in the figures will be described with the same reference numerals.

First, in FIG. 2, a pair of magnetic blocks 11a,
11b has a mirror finish. In one magnetic core block IlH, the other magnetic core block 11b
A trapezoidal winding groove 12 and an angular glass groove 18 are formed along the longitudinal direction of the opposite surface.

The winding groove 12 is for winding the wire, and the glass groove 18 is a groove for filling glass with a low softening point. Also, a pair of magnetic core blocks 11a.

In the vicinity of the tape sliding portion of 11b, an upper glass groove ya is formed along the longitudinal direction on the opposing surfaces of the two.
, yb are formed, respectively.

A plurality of regulating grooves 10a, 10b are formed on the tape sliding surfaces of both magnetic core blocks 11a, 11b so as to be continuous with the upper glass grooves va, vb. The regulating grooves xoa and 1ob are for regulating the same pitch and track width TW.

Furthermore, a non-magnetic material such as SiO is applied to the upper surface of at least one of the magnetic core blocks lla and llb.
,,A7. After forming non-magnetic oxides such as O, J, and J by vapor deposition or sputtering, regulating grooves 1 oa and J ob having a track width TW are formed in both magnetic core blocks 11a.

11b so that there is no misalignment.

Next, a highly wear-resistant glass rod 15 is inserted into the upper glass grooves va, yb, and poured into the regulating groove 10 near the depth that forms the tape sliding surface, and further, both magnetic core blocks 11 a, I J A glass rod 16 with good fluidity and a softening point 50 to 100° C. lower than that of the glass rod 15 is inserted into the rear glass groove 18 between b and then heated in a heating furnace.

As a result, both glass rods 15 and 16 are melted at the same time,
Both magnetic core blocks lla and llb are firmly joined. Therefore, the glass is bonded and integrated into the winding groove 12 without flowing the glass.

Next, a pair of bonded magnetic core blocks 11a, l
The magnetic head chip shown in FIG. 1 can be obtained by processing a lb. tape sliding portion into a uniform rounded shape by circumferential grinding or the like, and then slicing it to a predetermined thickness.

Referring to FIG. 1, 13 is a track regulating groove xoa, J
Filled glass with high heat and abrasion resistance filled in the ob,
14 is adhesive glass with a low softening point.

Figures 3 to 6 show other embodiments of the present invention, with Figure 3 being a perspective view of the completed laminate holder, and Figures 4 and 6 being perspective views showing the manufacturing process. De s
b, FIG. 5 is a diagram for explaining the manufacturing process of a laminate holder (11), and this embodiment can be applied to a ferrite holder such as a laminate type Sendust head such as 8UvTR.

First, as shown in FIG. 6, an upper glass groove 7a is formed in the thickness direction of the track width obtained by processing one side of the bulk sender dust material, and a rear glass groove 18 is formed in the lower part.
After forming the upper glass groove 7a and the glass groove 18, the sendust chip is made into a sendust thin plate 21 with a predetermined gap g and the sendust chip 30 having a track width TW as shown in FIG. Both sides of the ferrite holder 300 are held between a pair of ferrite holders 2o using an organic adhesive or the like.

As shown in FIG. 5 of this laminate holder 20Fi, a pair of mirror-finished magnetic core blocks 11a, 11b (7) are provided with upper glass grooves 7a, 7b on opposing surfaces in the same manner as in the above embodiment. A winding groove 12 is formed below the winding groove 12, and a glass groove 18 is formed below the magnetic core block lla.

Glass rods 1 with high wear resistance are installed in the upper glass grooves 7a and 7b.
5, and a glass rod 1 with a low softening point is inserted into the glass groove 18.
Filled glass 13 is formed by inserting glass 6 and heating and melting it.
% bonded glass 14, magnetic core block 11a,
zlb is joined.

Next, by processing the tape sliding surface into a rounded shape, a ferrite holder 20 as shown in FIG. 3 is formed.

As shown in FIG. 4, such a ferrite holder 20 is bonded to both sides of the sendust chip 30, and then a laminate type sendust head 40 is formed. By using a filled glass 13 having wear resistance almost equivalent to that of ferrite material around the tape sliding part, uneven wear of the tape contacting part around the tape sliding part is avoided. As a result, a laminate type magnetic head can be obtained which can improve the head life and also improve the magnetic properties of the head.

In this way, in the embodiment shown in FIGS. 3 to 6, as in the embodiment shown in FIGS. 1 and 2, the filling glass 13 that forms the tape sliding surface during glass welding is set at a temperature that allows it to be welded to the ferrite. Therefore, there is no need to lower the viscosity below the working temperature.

That is, if the glass material is the same as in the conventional method, glass can be formed at a predetermined position by low temperature treatment (I).

In addition, the glass rod 16 disposed on the joint surface of the magnetic core blocks 1.1a and Jlb is made of glass whose viscosity is 10 voids or less under the temperature conditions of the low temperature treatment. A glass rod 16 can be placed in a flowing manner on the joint surface of the glass rod. Therefore, both magnetic core blocks 11a and llb can be firmly joined.

〔Effect of the invention〕

As described above, according to the magnetic head of the present invention, a glass material with good wear resistance can be processed at low temperature, and it is possible to prevent surface roughening due to high temperature on the gap forming surface of the abutting part of the magnetic core block, and also to have good wear resistance. Therefore, it has good magnetic properties and can be easily manufactured.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a magnetic head chip according to an embodiment of the magnetic head of the present invention, FIG. 2 is a perspective view of a magnetic core block for explaining the manufacturing process of the same magnetic head, and FIG. 3 is a perspective view of a magnetic head chip according to the present invention. FIG. 4 is a perspective view of a ferrite holder applied to another embodiment of the magnetic head of the present invention, FIG. 5 is a perspective view of another embodiment of the magnetic head of the present invention, and FIG. 6 is a perspective view of the Sendust thin plate in the magnetic head of FIG. 4, FIG. 7 is a perspective view of a conventional magnetic head, and FIG. 8 is a perspective view of a conventional magnetic head. FIG. 9 is a perspective view of a magnetic core block for explaining the manufacturing process, and a diagram showing the track width in a conventional magnetic head. 7 a, y b - upper glass groove, 1 oa, zo
b...Track regulation groove, lla, llb...Magnetic core block, 12...Winding groove, 13...Filled glass, 14...J & laminated glass, 15.16...Glass rod , 18... Glass groove, 20... Ferrite holder, 2... Sendust thin plate, so... Sendust thin plate 7', 40... Sendust head. Figure 2 Figure 6 Figure 7 Figure 8 Figure 9

Claims (1)

[Claims] a pair of magnetic core blocks having track regulation grooves;
The pair of magnetic core blocks are butted against a highly wear-resistant filled glass that fills the track regulation groove and joins the pair of magnetic core blocks so as to have a predetermined gap on the sliding surface of the tape. A magnetic head comprising: a bonding glass having a softening point lower than that of the above-mentioned filling glass, which is filled in a portion of the magnetic core block and connects a pair of magnetic core blocks.