JPH02141908A - Magnetic head - Google Patents

Abstract

PURPOSE:To attain assembling simply and efficiently by using an insertion piece and an elastic member having an elastic support piece rising in an opposite direction to the insertion piece so as to assemble the back core to the front core. CONSTITUTION:The elastic member 5 has the insertion piece 51 and the elastic support piece 52 rising in the opposite direction. The insertion piece 51 of the elastic member 5 is inserted between gaps 9,10 formed between support members 3,4 and core pieces 102,103 and fitted to the support members 3,4, then there is a gap between the elastic support piece 52 and side faces of the core pieces 102,103. When a back core 2 is inserted in the gap while the elastic support piece 52 is pushed and spread outward, the back core 2 is closely in contact with side faces 107 - 109 of the core pieces 101 - 103 of the front core by the elasticity of the elastic support chip 52. Thus, the magnetic gap between the front core and the back core 2 is decreased and uniformized and the assembling is simplified and the work efficiency is improved.

Description

Detailed Description of the Invention <Industrial Application Field> The present invention relates to a magnetic head, and a back core holding device prepared for coupling a back core to a front core is a combination of a support member and an elastic member. , the supporting member is inserted into the core piece constituting the front core so that a gap is created between the core piece and the side surface of the core piece, and the insertion piece provided on the elastic member is inserted into the gap, so that the elastic By attaching the member to the support member, inserting the back core between the elastic holding piece raised in the opposite direction to the insertion piece and the side surface of the core piece, and bringing it into elastic contact with the side surface of the core piece. This is intended to facilitate assembly and stabilize magnetic properties after assembly.

<Conventional technology> For example, magnetic floppies, disks, audio,
As various magnetic heads for video or computers, a coil is inserted into a front core with a magnetic gap for reading/writing or erasing, and the core assembly is protected by attaching a back core to the rear end of the front core. A magnetic head is known that is fixed within a housing and attached to a support device via a gimbal.

The general technique of attaching the back core to the front core is
The method is to use adhesive to bond the two together. However, when adhesive is used, the front core and back core are separated by a magnetic gap created by the adhesive, resulting in deterioration or fluctuation of magnetic properties.Also, the adhesive expands or contracts due to temperature fluctuations. However, the magnetic properties may vary. Furthermore, an adhesive application process and the like are required, resulting in the disadvantage that assembly work becomes troublesome.

As a conventional technique for solving such technical problems, the technique disclosed in US Pat. No. 4,152,742 is known. In this known technique, a spring retaining clip is used to connect the back core to the front core. The retention clip has a first surface member for engaging a side surface of the back core and a pair of resilient tabs for engaging the front core, the retaining clip having a first surface member for engaging a side surface of the back core and a pair of resilient tabs for engaging a front core. and a front core are interposed therebetween, and both are elastically held by the same elastic tab.

<Problems to be Solved by the Invention> However, the technology disclosed in U.S. Pat. Since both are held together by the same elastic tab, the assembly process involves holding the back core in contact with the front core, and then attaching the holding clip to sandwich the two. This means that the back core must be fixed onto the front core by some means before attaching the retaining clip, which reduces assembly workability and efficiency. Become.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and to provide a magnetic head that can be assembled easily and efficiently and that can be assembled automatically.

Means for Solving the Problems> In order to solve the above problems, the present invention provides a magnetic head including a front core, a back core, and a back core holding device, wherein the front core has a magnetic gap on one end side. have,
A side surface on the other end side opposite to the one end side is a contact surface with the back core, and the back core is arranged so as to come into contact with the side surface of the front core to complete a magnetic circuit. The back core holding device includes a combination of a support member and an elastic member, and the support member is configured to form a gap between a core piece constituting the front core and a side surface of the core piece. The elastic member has an insertion piece and an elastic holding piece that stands up in a direction opposite to the insertion piece, and the insertion piece is inserted into the gap and the support member is inserted into the support member. The back core is inserted into a space between the elastic holding piece and the side surface of the core piece, and is brought into elastic contact with the side surface of the core piece. .

Function> The supporting member of the back core holding device is inserted into the core piece constituting the front core so that a gap is created between the core piece and the side surface of the core piece. The insert piece can be inserted into this gap and attached to the support member.

The back core is inserted into the gap formed between the elastic holding piece and the side surface of the core piece, and is brought into elastic contact with the side surface of the core piece. Thereby, the front core and the back core are directly brought into close contact with each other by receiving the elasticity of the elastic holding piece. Therefore, the magnetic gap between the two becomes extremely small and uniform.

When installing the back core, it is only necessary to insert the back core into the space created between the elastic holding piece and the side surface of the core piece, and there is no need to temporarily fasten the back core during the work. Totally unnecessary. This simplifies assembly work and improves work efficiency.

<Example> Fig. 1 is an exploded perspective view of the main parts of a magnetic head according to the present invention, Fig. 2 is a perspective view of the same in an assembled state, and Fig. 3 is an enlarged cross-sectional view. is the front core, and 2 is the back core. 3.4 is a support member, 5 is an elastic member, and these constitute a back core holding device. 7.8 is a coil.

The structure of the front core 1 changes depending on whether the magnetic head is a read/write head, an erase head, or a head having both functions.

In the figure, a magnetic head for reading/writing and erasing is shown, and is an assembly in which a second core piece 102 and a third core piece 103 are arranged on both sides of a first core piece 101. These core pieces 101 to 103 are made of magnetic material such as ferrite or amorphous alloy. First core piece 101
The second core piece 102, the first core piece 101, and the third core piece 103 have one end side facing the magnetic gap 10.
4.105. The magnetic gaps 104 and 105 are read/write gaps or erase gaps, and are shown enlarged although they are actually very small gap intervals. Magnetic gap 104.
105 and the space around it are filled with a bonding glass fillet 106. 10 core pieces each
1 to 103, the side surfaces 107 to 109 on the other end side opposite to the one end side where the magnetic gap 104 and 105 are provided are
The two are flat surfaces on the same plane, and constitute a contact surface with the back core 2.

The back core 2 has a rectangular cross section, and the − side surface is
The core pieces 101 to 103 constituting the front core 1 are arranged so as to be in surface contact with the side surfaces 107 to 109, respectively, to complete a magnetic circuit.

The support member 3.4 also serves as a coil bobbin inserted into the second core 102 and the third core piece 103. In contrast to what is shown, the support element 3.4 can also be constituted by an independent element other than the coil bobbin.

The support member 3 is inserted into the second core piece 102 so that a gap 9 is created between the support member 3 and the side surface of the second core piece 102 . The support member 4 is similarly attached to the third core piece 103 so that a gap 10 is created. Further, it is also possible that either one of the supporting members 3.4 is inserted into the core piece 101 of 341.

For example, among the core pieces 101 to 103, the only combination that requires the back core 2 is the first core piece 101 and either the second core piece 102 or the third core piece 103. , a case where either the second core piece 102 or the third core piece 103 is not present. Also in this case, at least one of the support members 3.4 is constituted by an independent member different from the coil bobbin.

The elastic member 5 has an insertion piece 51 and an elastic holding piece 52 that stands up in the opposite direction to the insertion piece 51. This elastic member 5 is attached to the support member 3.4 by inserting the insertion piece 51 into the gap 9.10. The insertion piece 51 is inserted into the gap 9
．． 10, the second core piece 102 and the third
Two zero-elastic holding pieces 52 are provided at an interval corresponding to the interval between the core pieces 103, and are curved into an appropriate shape such as an S-shape along the entire length. Such an elastic member 5
can be made using an elastic metal material such as phosphor bronze or permalloy or a highly elastic plastic material.

The insertion piece 51 of the elastic member 5 is inserted between the support member 3.4 and the core piece 1.
02.103 and the elastic member 5 is attached to the support member 3.4, between the elastic holding piece 52 and the side surface of the core piece 102.103,
The back core 2 is inserted into this gap while pushing the elastic holding pieces 52 outward. Due to the return elasticity of the elastic holding piece 52, the back core 2
It closely contacts the side surfaces 107 to 108 of Nos. 1 to 103.

As a result, the magnetic gap between the front core 1 and the back core 2 becomes extremely small and uniform.

Moreover, there is no need to temporarily fix the back core 2 during the assembly process. Therefore, assembly work is simplified, work efficiency is improved, and automatic assembly is also possible.

<Effects of the Invention> As described above, in the magnetic head according to the present invention, the back core holding device for assembling the back core to the front core is
The support member includes a combination of a support member and an elastic member, and the support member is inserted into a core piece constituting the front core such that a gap is created between the core piece and the side surface of the core piece, and the elastic member is
It has an insertion piece and an elastic holding piece that stands up in the opposite direction to the insertion piece, and the insertion piece is inserted into the gap and attached to the support member, and the elastic holding piece and the side surface of the core piece are attached to each other. Since the back core is inserted into the space between the core pieces and makes elastic contact with the side surfaces of the core pieces, assembly work can be performed easily and efficiently, and automatic assembly is possible. A magnetic head having an extremely small and uniform magnetic gap between the core and the back core and excellent magnetic properties can be provided.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of the main parts of a magnetic head according to the present invention, FIG. 2 is a perspective view of the magnetic head in an assembled state, and FIG. 3 is an enlarged view of the relationship between the back core holding device and the back core. FIG. 1...Front core 2...Back core 3.4.
... Supporting member 5 of the back core holding device... Elastic member 51 of the back core holding device... Insertion piece 52...
・Elastic retaining piece 9.10... Gap patent applicant TDT-K Co., Ltd. agent Patent attorney Mi Abe Next Part 2! J 3rd Procedural Amendment February 17, 1990, 1986 Patent Application No. 295497 2, Title of the invention: Magnetic head 3, Relationship to the person making the amendment case Patent applicant address: Nihonbashi-chome, Chuo-ku, Tokyo 13 number 1 name
(306) TDC Co., Ltd. Representative Hiroshi Sato 4, Agent address: 1-37-2-5 Togane-cho, Katsushika-ku, Tokyo 125-7ELO3 (600) 5090, Date of amendment order Voluntary amendment 6, Subject of amendment Contents of 76 corrections for all drawings

Claims (1)

[Claims] A magnetic head including a front core, a back core, and a back core holding device, wherein the front core has a magnetic gap on one end side,
A side surface on the other end side opposite to the one end side is a contact surface with the back core, and the back core is arranged so as to come into contact with the side surface of the front core to complete a magnetic circuit. The back core holding device includes a combination of a support member and an elastic member, and the support member is configured to form a gap between a core piece constituting the front core and a side surface of the core piece. The elastic member has an insertion piece and an elastic holding piece that stands up in a direction opposite to the insertion piece, and the insertion piece is inserted into the gap and the support member is inserted into the support member. The back core is inserted into a space between the elastic holding piece and the side surface of the core piece, and is brought into elastic contact with the side surface of the core piece. magnetic head.