JPS58222425A - Manufacture of magnetic head for floppy disk - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method of manufacturing a magnetic head for a floppy disk.

[Technical background of the invention]

As is well known, a floppy disk is a device in which data is read or written by rotating a magnetic medium and reciprocating a magnetic head in the track direction along the magnetic medium. In order to prevent the magnetic head from picking up noise between tracks, straddle erase cores for erasing are provided on both sides of the read/write core. A typical example thereof is shown in FIGS. 1 to 3.

In other words, insert the tips of the read/write cores (4) into the grooves (2) of the housing (1), which also serves as a jig, and insert the straddle erase core (5) into the other groove (3). Glass beads are interposed between these read/write cores (4) and the straddle erase core (5), and after melting and solidifying, a straddle erase core (7) is formed by winding an erase coil (6). ) is coupled to the straddle erase core (5) K. Alternatively, the housing (1) may be divided into two parts and bonded together using a high melting point adhesive that melts at a temperature equivalent to 900° C. during assembly.

[Problems with background technology]

However, in the above-described structure, it is extremely difficult to connect and position the read/write core (4) and the to-straddle erase core (5) without using the housing (1) which also serves as a jig. It is also difficult to reduce the width of the straddle erase core (5), making it unsuitable for applications with a large number of tracks.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned points, and provides a magnetic head structure for a floppy disk that allows the read/write core and the straddle erase part to be accurately positioned and connected without using a jig. The purpose is to provide a method □.

[Summary of the invention]

This invention forms a plurality of track grooves that define track widths in a pair of core materials, fills these track grooves with a magnetic material while interposing an insulating layer, and defines a read/write gap using the insulating layer. When the core materials are joined facing each other and the joined core materials are cut from the center of the track groove, a state is obtained in which the read/write cores are joined facing each other and straddle erase parts made of magnetic material are joined on both sides. Therefore, a head chip equipped with a read/write core and a straddle erase part can be obtained very easily without using a housing that also serves as a jig. The read/write gap can be easily defined by the insulating layer that insulates between the core and the straddle erase part, and the magnetic material filled in the track groove that defines the track width as the straddle erase part can be filled with sputtering or other methods. It can be formed to an extremely thin and uniform film thickness using vapor deposition methods, etc., and therefore trimming and erasing using the straddle erase section can be performed accurately even in applications that require high-density tracks. It is composed of

[Embodiments of the invention]

Embodiments of the present invention will be explained in the order of manufacturing process with reference to FIGS. 4 to 10. First, as shown in Fig. 4, the core material 00 is
αη is provided, and a plurality of grooves 0 and track grooves υ are formed perpendicularly on one core material 01. A track groove c14 is also formed in the core material 0■ facing the track groove 0].

Next, as shown in FIG. 5, an insulating layer α9 and a magnetic material 00 are sequentially laminated on one surface of the core materials Q1 and 0η.

The magnetic material OQ is formed by sputtering or vapor deposition.

Furthermore, as shown in FIG. 6, a magnetic material α6 and an insulating layer αυ
The magnetic material 0j04 is removed by lapping, boring, etching, etc., and thereby the magnetic material 0j04 is
A desired strut erase portion q'h is formed with an insulating layer 0→ interposed therebetween. In this case, the insulating layer α9 leaves at least a portion of the track groove (1:4) other than 141 to form a read/write gap (A) to be described later.

Furthermore, as shown in FIG. 7, the core material (In (11)
Overlap and combine. The bonding is performed by melting and solidifying glass between the two.

By slicing the core material 04αυ in the plane indicated by the dashed-dotted line in FIG. The head chips (1) are made to face each other and are divided into head chips (c) in which straddle erase parts αη are connected to both row sides.

Next, as shown in Fig. 9, a read/write coil is wound around groove α2, and an erase coil (c) is attached to the U.
A letter-shaped straddle erase core (c) is elastically joined to the straddle erase portion a. In reality, a slider (c) is attached to the thus assembled magnetic head as shown in FIG. 10, and is further connected to a carrier (not shown) which is held by a holder and moves in the track direction of the magnetic medium. It is.

In this way, the read/write core 0 and the straddle erase part α are connected with the insulating layer α interposed, but there is no need to use a housing that also serves as a jig as in the past. The outer surface of the read/write core 0→(to) is formed in the same plane with high dimensional accuracy by slicing.

It is also easy to keep the depth of the track groove α]04 within a small allowable dimension. Therefore, the width of the track is accurate and coincides with the distance connecting the bottoms of the track grooves α$C14.

Setting the film thickness of the insulating layer α to be thin and uniform can also be easily done by lapping, boring, etc. The thickness of the straddle erase portion cl'h can also be extremely thin, uniform, and easily determined by performing processes such as sputtering and vapor deposition, followed by lapping, borising, and etching. It is also possible to set it to 150μ or less. Therefore, a track K having a large number of tracks per unit length can also be used satisfactorily. In addition, since we are busy forming the straddle erase portion αη using the track grooves 0jαY′:1, , :1: which regulate the track width, it is necessary to fill all of the track grooves αJ (14) with glass. Therefore, only a small amount of glass is needed to bond the core material (10Q force).

However, the track groove α1α→ is not limited to a semicircular shape, but may be square. Furthermore, when the insulating layer 09 is removed by lapping, boring, etc., the thickness of the insulating layer Q9 on the surface where the read/write gap is formed can be easily made uniform by lapping, boring, etc.; Gap (read/write gap (a) between one scratch can be set arbitrarily).

〔Effect of the invention〕

Since the present invention is configured as described above, a head chip equipped with a read/write core and a straddle erase section can be manufactured extremely easily, and a read/write core and a straddle erase section can be manufactured very easily.
The read/write gap can be easily defined by the insulating layer that insulates between the write core and the straddle erase part.Furthermore, the magnetic material filled in the track groove that defines the track width as the straddle erase part is It can be formed with an extremely thin and uniform film thickness by sputtering or vapor deposition, and has the advantage of being able to accurately perform trimming and erasing using the straddle erase section even in applications that require high-density tracks. It has the following.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing a conventional example, FIG. 2 is a sectional side view thereof, FIG. 3 is a plan view thereof, and FIGS. 4 to 10 are related to embodiments of the present invention. The figure is a perspective view showing the core material facing each other, FIG. 5 is a partially enlarged side view showing the process of laminating the insulating layer and the magnetic phase on the core material, and FIG. 6 is the insulating layer and the magnetic phase. Fig. 7 is a perspective view showing the process of gluing the core material, and Fig. 8 is slicing the core material into individual head chips. 9 is a perspective view showing the step of attaching a read/write coil and an erase coil to the head chip, and FIG. 10 is a plan view showing the state in which the slider is attached to the head chip. It is. DESCRIPTION OF SYMBOLS 10-11... Core material, 13-14... Track groove, 15... Insulating layer, 16... Magnetic material, 17... Strad erase part, 18-19... Read/write Core, 2o...Read/Write Gap Application Person Tokyo Electric Co., Ltd.

Claims (1)

[Claims] A plurality of track grooves are formed on opposing surfaces of opposing core materials, and an insulating layer is formed from the track grooves of the core material to the surface facing the opposing core material, and at least this insulating layer is formed. The track grooves are filled with a magnetic material, and the magnetic material protruding from the track grooves is smoothly removed along the inner surface of the core, and at least the read/write gap forming surface of the flat surfaces between the track grooves is filled with the magnetic material. The inner surface of the core material is finished smooth while leaving the insulating layer at a constant thickness, and the core materials are bonded to face each other. By cutting on the line, a pair of glue is formed using the read/write gap created by the insulating layer.
1. A method of manufacturing a magnetic head for a floppy disk, characterized in that the head chip is divided into head chips each having read/write cores facing each other and straddle erase portions made of magnetic material in the track grooves bonded to both sides.