JPS6238516A - Magnetic head - Google Patents

Abstract

PURPOSE:To reduce the cost and facilitate positioning a read/write core and erase cores and forming an erase gap by forming recessed parts on nonmagnetic metallic thin plates of the outer layer of the read/write core and fitting and fixing poles of erase cores to recessed parts. CONSTITUTION:Plural magnetic metallic thin plates A are laminated and nonmagnetic metallic thin plates B are laminated on both faces of them to obtain an approximately channel-shaped laminate core, and lower parts of laminate cores 1a and 1b formed in this manner are joined and upper parts are allowed to face each other with a read/write gap 1c between them, and a read/write coil 1d is fitted to the junction part between laminate cores 1a and 1b. Magnetic metallic plates are bent and formed to an approximate channel shape to obtain erase cores 2a and 2b, and their poles 2c and 2d are fitted to recessed parts 1e and 1f formed on side faces of nonmagnetic metallic thin plates B forming outermost layers of the laminate core 1a, and the thickness of nonmagnetic metallic thin plates B in parts where recessed parts 1e and 1f are formed is the erase gap. Erase cores 2a and 2b have the same shape or symmetrical shapes and have lower parts put one over the other.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a magnetic head that reads data from, writes data to, or erases data from a floppy disk, etc., and more specifically relates to a straddle. This invention relates to an erase type magnetic head.

(Prior Art) A conventional straddle erase type magnetic head uses an oxide magnetic material for the core.

(Problems to be Solved by the Invention) For this reason, there is a problem in that pressing and squeezing are difficult, and machining such as cutting and polishing is often required. Furthermore, due to poor spreadability, cracks, chipping, etc. are likely to occur.

The present invention has been made in view of the above problems, and the first purpose is to solve the above problems and realize a low-cost magnetic head, and the second purpose is to solve the above problems and realize a low-cost magnetic head. It is an object of the present invention to provide a magnetic head in which positioning of an erase core and formation of an erase gap are easy.

(Means for Solving the Problems) The present invention, which solves the above problems, uses a laminate core obtained by laminating a plurality of metal magnetic thin plates and laminating a non-magnetic metal thin plate on the outside as a read/write core. , a core obtained by bending and forming a single magnetic metal plate is used as the erase core, and a recess is formed in the non-magnetic thin metal plate outside the read/write core, and the ball of the erase core is fitted and fixed in the recess. It is characterized by the fact that

(Function) In the magnetic head of the present invention, since the read/write core and the erase core are constructed using a metal magnetic material,
Core molding and processing become easier.

Furthermore, since the read/write core has a laminated structure, the read/write characteristics do not deteriorate compared to conventional heads. Furthermore, since a recess for positioning the erase core is provided in the non-magnetic metal layer plate outside the read/write core,
Positioning of the erase core and formation of the erase gap can be performed easily and accurately.

(Example) Embodiments of the present invention will be described in detail below with reference to the drawings.

Figures 1 to 4 are configuration diagrams showing the main parts of an embodiment of the present invention, and in the figures, 1a and lb are a plurality of laminated magnetic metal thin plates (for example, 6 sheets with a thickness of 25 μm). A substantially U-shaped laminate core is obtained by laminating a non-magnetic metal thin plate Bf on the outside thereof, the lower part of which is joined, and the upper part facing each other with a read/write gap 1G in between. A read/write coil 1d is connected to the junction of these laminated cores la and Ib. These laminate cores 1a, 1b and coil 1d together constitute the read/write head 1. Also, 28°2b
are erase cores formed by bending a magnetic metal plate into a substantially U-shape (see Fig. 2), and the balls 2c and 2d are recesses formed on the side surface of the non-magnetic thin metal plate B forming the outermost side of the laminated core 1a. 1e.

1f, respectively. Therefore, the recesses 1e, 1
The thickness of the nonmagnetic metal thin plate B at the portion where r is formed becomes the erase gap. The erase cores 2a and 2b have the same or symmetrical shape, and their lower portions (ends) are overlapped as shown in FIG.

An erase coil 2e is fitted into this overlapping portion, and the erase head 2 is constituted by the coil 2e and the erase cores 2a and 2b.

The operation of the magnetic head in such a configuration is exactly the same as the conventional 9-head, in which data is written or read through the read/write gap 1C, and the erase gap (non-magnetic Trimming is performed to prevent interference with adjacent tracks depending on the thickness of the metal layer plate B.

According to the above configuration, the laminate cores 1a and 1b made of 81 m of metal magnetic thin plates are used as read/write cores, and the erase cores 2a and 2b are made by bending metal magnetic plates. 1a, 1b,
2a and 2b can be formed by pressing or squeezing. Therefore, productivity can be improved and costs can be reduced.

Moreover, since it is malleable, it does not cause cranking or pitching, and from this point of view as well, costs can be reduced.

Furthermore, balls 2c of erase cores 2a and 2b.

Since the laminate core 1a is provided with recesses is and 1f into which 2d is fitted, the erase core 2a.

2b and erase gap formation can be performed easily and accurately.

Note that the present invention is not limited to the above embodiments, and various modifications are possible. For example, in the above embodiment, erase core 2
Although a configuration has been shown in which the magnetic resistance at the joint is reduced by overlapping the lower portions of a and 2b, a butt joint or the like may also be used.

Moreover, as shown in FIGS. 5 and 6, instead of the non-magnetic metal thin plate B, a non-magnetic metal thin plate B1 provided with a notch 1q for forming a recess and a non-magnetic metal layer without a notch are used. The plate B2 may be used in a polymerized state.

Furthermore, the thickness of the magnetic metal thin plates A constituting the laminate cores la and 1b is set to be less than a level that can prevent high frequency loss, for example, 50 mm.
It may be less than μm.

(Effects of the Invention) As explained above, in the present invention, a laminate core made of laminated metal magnetic plates is used as a read/write core, and a core made by bending and molded metal magnetic plates is used as an erase core.
Each core can be formed by pressing or squeezing, and since it has good malleability, no cracks will occur. Therefore, a magnetic head with good productivity and yield (and low cost) can be obtained.

Furthermore, since a concave portion is formed on the laminate core side and one ball of the erase core is placed therein, positioning of the erase core and gap formation can be performed easily and accurately.

4. IFIIItJ of the drawing! Fig. 1 is a main part configuration diagram of an embodiment of the present invention, and Fig.
3 is a plan view showing the main parts of the embodiment shown in FIG. 1, FIG. 4 is an exploded perspective view of a part of the embodiment shown in FIG. 1, and FIG. FIG. 6 is an exploded perspective view showing a part of another embodiment, and FIG. 6 is a plan view showing a main part of the embodiment of FIG.

1... Read/Write head 1a, 1b... Laminate core 1C... Lead 7/Write gap 1d... Coil 1e, 1f... Concave portion 1g... Notch 2... Erase head 2a, 2b ...Erase cores 2c, 2d...Ball 2e...Coil A...Metal magnetic thin plates B, B1
．． B2...Non-magnetic thin metal sheet patent applicant Foster Technology Co., Ltd. Agent Patent attorney Fujiji Ijima.

1 other person Figure 3 81 Non-magnetic metal book plate Figure 4 Figure 6

Claims (1)

[Claims] A laminate core obtained by laminating multiple metal magnetic thin plates and a non-magnetic metal thin plate on the outside is used as the read/write core, and a core obtained by bending and forming a single metal magnetic plate is used as the erase core. A magnetic head further comprising: a recess formed in a non-magnetic thin metal plate outside the read/write core, and a ball of the erase core fitted and fixed in the recess.