JPH02201718A - Magnetic head - Google Patents

Abstract

PURPOSE:To simplify a tape lapping stage and to reduce the cost of production by providing notches to the ends of the tape sliding surface of a magnetic core formed with a working gap. CONSTITUTION:A pair of core blocks 1A, 1B consisting of a magnetic material, such as oxide or magnetic metal material, are butted against each other with the side provided with a groove 2 for a winding window faced on the inner side to constitute the magnetic core having the working gap 3. The notches 4, 4 are formed to both ends of the tape sliding surface formed with the working gap 3 and the front surface part of the tape is subjected to tape lapping so as to form the tape sliding surface, by which a head chip is obtd. The magnetic head of the low cost is obtd. with the good mass productivity in this way.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is particularly applicable to information recording and reproducing devices that require high-density magnetic recording, such as video tape recorders (VTRs), digital audio tape recorders (DATs), and floppy disk devices. The present invention relates to a magnetic head that is used, and particularly to a magnetic head that facilitates machining of the front surface of the head and simplifies the manufacturing process.

[Conventional technology]

The magnetic head used in this type of information recording and reproducing device is
As shown in Figures 3 (A), (B), (C), and (D), a pair of magnetic materials made of magnetic materials such as oxide magnetic materials such as ferrite and metal magnetic materials such as sendust are shown. It is mainly composed of a magnetic core in which core blocks IA and IB are butted against each other and an operating gap 3 is formed on the abutting surfaces. The magnetic core formed by a pair of core blocks LA and IB is subjected to R polishing by a method such as a cylindrical polishing method in order to provide a tape sliding surface P formed on the working gap 3 side. 3(B)), and then the entire tape sliding surface P is finished into a predetermined shape by tape wrapping [FIG. 3(C)]. Here, R-polishing is a process in which a grinding wheel with fine grains of, for example, #1000 to #2000 is rotated, and the head processing section is brought into contact with the end face of the whetstone while vibrating up and down, and grinding is performed. This is a finishing process in which a lapping tape (tape with #1000 to #8000 abrasive grains attached to a Mylar base) is run and the front surface of the head is mechanically moved up and down and oscillated.

In this manner, the magnetic core is subjected to R polishing and tape wrapping, and the processing of the front surface of the head is completed, thereby completing the magnetic head.

In addition, in FIGS. 3(A), (B), (C), and (D), reference numeral 2 indicates a winding window groove provided in the core block IB.

[Problem to be solved by the invention]

Conventional magnetic heads are constructed as described above, and the processing of the front surface of the head, which serves as the tape sliding surface, requires R polishing and tape wrapping processes, which complicates the manufacturing process and increases costs. I had a problem with it coming up.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a low-cost magnetic head that can be easily mass-produced in order to solve the above-mentioned problems with conventional magnetic heads.

[Summary of the invention]

In order to achieve the above-mentioned object, the present invention provides a magnetic head including a magnetic core in which an actuation cap is formed by butting together a pair of core blocks made of magnetic material, and in which an actuation gap is formed in the magnetic core. The gist is that a notch is provided at the end of the tape sliding surface.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1(C) shows the configuration of a magnetic head showing an embodiment of the present invention, which has the same basic configuration as the conventional magnetic head shown in FIG. In the constructed magnetic core, notches 4 are provided at the ends of the tape sliding surface where the working gap 3 is formed. The notches 4 are provided at the upstream and downstream ends of the magnetic core along the tape running direction with respect to the tape sliding surface of the magnetic core.

FIGS. 1A and 1B show the basic steps for producing a magnetic head according to the present invention, which includes the following steps. That is, core blocks IA and IB made of magnetic materials such as oxides and metal magnetic materials are prepared, and one core block IB is provided with a winding window groove 2. A pair of core blocks LA and 1B are butted against each other with the side provided with the winding window groove 2 inward, forming a magnetic core having an operating gap 3 [FIG. 1(A)]. Then, cutouts 4.4 are formed at both ends of the tape sliding surface where the operating gap 3 is formed (FIG. 1(B)), and tape wrapping is applied to the front surface of the head as much as possible to serve as the tape sliding surface. A head chip shown in FIG. 1(C) is obtained.

Next, a specific method of manufacturing the magnetic head of the present invention described above will be explained based on FIG. 2.

First Embodiment A pair of core blocks LA and IB are butted against each other with the winding window groove 2 of the core block 1B on the joining side, forming an operating gap 3 and completing the joining process [Fig. 2 (A) ]. Core block LA after the joining process.

IB is subjected to R polishing on the tape sliding surface on which the working gap 3 is formed [FIG. 2(B)]. Next, both ends of the tape sliding surface are ground, and notches 3 are provided (see Fig. 2).
C)]. Core blocks IA and IB with cutout portions 4 formed
is sliced at predetermined intervals around the working gap 3, and then becomes a head chip. The tape sliding surface of the head front part of this head chip is finished by tape wrapping [FIG. 2 (D)] to obtain a completed hent tip [FIG. 2 (E)].

Second embodiment Core block I after the joining process shown in FIG. 2(A)
In A and IB, notches 4 are provided by grinding both ends of the tape sliding surface where the operating gap 3 is formed [Figure 2 (F)
]. Next, R
After polishing [FIG. 2(C) LL], the head chips are sliced to obtain head chips. The tape sliding surface of this head chip is subjected to tape wrapping [FIG. 2 (D)] to obtain a head chip [FIG. 2 (E)].

Third Embodiment The core blocks IA and IB with the cutouts shown in FIG. 2(F) are sliced to form a head chip.

Tape wrapping is applied to the tape sliding surface of this head chip [FIGS. 2 (G) and (D)] to obtain a completed hent chip.

In addition, in the above embodiment, the shape of the notch provided in the core block was explained as an example of a flat shape, but the shape of this notch can also be a teeper (straight line) as the end shape of the core block. It is possible to do so.

It is possible to perform tape wrapping processing, simplifying the tape wrapping process, and significantly reducing manufacturing costs.

[Brief explanation of the drawing]

FIGS. 1(A), (B), and (C) are plan views showing one embodiment of the present invention including the manufacturing process, and FIGS. 2(A) to (G) are perspective views and plan views showing the manufacturing process. 3A to 3D are plan views showing a conventional magnetic head including manufacturing steps. LA, IB... Core block, 3... Operating gap, 4... Notch. [Effects of the Invention] As explained above, the present invention is configured such that a notch is provided at the end of the tape sliding surface of the magnetic core where the operating gap is formed, so that the tape actually contacts the magnetic core. Concentrated patent applicant for tape sliding surface Pioneer Corporation

Claims (1)

[Claims] A magnetic head comprising a magnetic core in which a working gap is formed by butting together a pair of core blocks made of magnetic material, the magnetic core being arranged on a tape sliding surface where the working gap is formed. A magnetic head characterized in that a notch is provided at an end.