JPS6047216A - Magnetic head device - Google Patents

Abstract

PURPOSE:To obtain a magnetic head device with ease of manufacture and high reproducing efficiency by increasing the size of a magnetic short-circuit piece fitting part more the size of a face opposite to a medium in a magnetic substance of nealy I-shape of a recording/reproducing core and an erase core. CONSTITUTION:A nonmagnetic auxiliary plate 5 of a core 1A of nearly L-shape and a core 1C of a nearly inverted L-shape is bonded by glass or the like and a bonded part of the cores 1A, 1C forms a recording/reproducing head gap 3. The bonded part of the core 1C of nearly inverted L-shape and the nonmagnetic auxiliary plate 5 is independently of recording/reproduction. The sizes l1 and l3 of the core 1C of nearly inverted L-shape have the relation of l1<l3 and the size of medium opposite face l1 is smaller than that of the fitting part l3 of the magnetic short-circuit piece 6. Through the construction above, 0.2-0.3mm. is realized easily as the l1 and the l3 is larger than the l1, then the increase in the magnetic resistance of the fitting part of the magnetic short-circuit part 6 is suppressed and also the magnetic short-circuit piece 6 is attained easily.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head device equipped with a recording and reproducing head gap and an erasing head gap, and more particularly to a magnetic head device that is capable of high-density recording and has high recording and reproducing efficiency.

2. Description of the Related Art Devices have been put into practical use that sequentially record and reproduce signals by moving a magnetic head device in the radial direction of a rotating magnetic recording medium. The magnetic head device is moved by a stepping motor, a linear motor, a hydraulic servo, etc.
The movement interval is not necessarily accurate: some deviations occur. Therefore, when reproducing a magnetic recording medium recorded by another device, track deviation may occur and stable reproduction may not be possible. Therefore, a method has been proposed in which a recording/reproducing core having a rad gap for recording/reproducing is combined with an erasing core having an erasing head gap to accurately erase the end portion adjacent to a recorded track.

(Refer to Japanese Unexamined Patent Publication No. 50-40118.) FIG. 1 shows the schematic shape of the medium facing surface of a magnetic head device. 1 is a recording/reproducing core having a rad gap 6 for recording/reproducing. 2a
, 2b are erase cores, and 26 and 2b are arranged on the outer side and the inner side of the center of the recording medium, respectively, and have erase/rad gaps 4a and 4b, respectively. 5 is an auxiliary plate made of non-magnetic material.

FIG. 2 is an exploded view of the assembly. A recording/reproducing coil is wound around the substantially shaped portion of the recording/reproducing core, and the substantially I-shaped portion and the end of the substantially shaped portion are magnetically coupled by a magnetic short circuit H6 to form a magnetic circuit.

In FIG. 3, the mounting position of the magnetic shorting piece 6 is indicated by a broken line. In the recording/reproducing core 1, an approximately-shaped one person, an approximately-shaped one 1B, and an auxiliary plate 5 are joined together by glass or the like, and the joining portion between the one person and 1B is a recording/reproducing gap 3. The joint portion 7 between the roughly shaped 1B and the auxiliary plate has nothing to do with recording and reproduction.

As the diameter of the recording medium becomes smaller, 1) F) in Figure 1
It has become necessary to reduce the dimensions. As the diameter becomes smaller, the erasing gap 4bIJ'' overlaps the locus recorded by the recording/reproducing gap 3, causing more erasing than necessary, resulting in a reduction in the reproduction output.

In order to prevent unnecessary erasure, it is necessary to reduce l. For media with a diameter of 8 inches, l is 0.8 to 0.96, but for media with a diameter of 5.25 inches or less, l is o,! tone is required. Reducing l can be achieved by reducing the dimension 11 of the schematic shape 1B shown in FIG. The same applies to the erasing cores 2a and 2b. However, since l is -1° in the roughly shaped 1B, reducing l means reducing the area facing the magnetic shorting piece 60, which inevitably increases the magnetic resistance and reduces the recording and reproducing efficiency. In addition, it becomes difficult to add the magnetic shorting piece 6.

An object of the present invention is to provide a magnetic head device that is easy to manufacture and has high reproduction efficiency.

In order to achieve the above-mentioned object, the present invention provides a magnetic head characterized in that the size of the portion where the magnetic shorting piece is attached is made larger than the size of the medium facing surface in the roughly shaped magnetic material of the recording/reproducing core and the erasing core. Device.

Hereinafter, the present invention will be explained in detail based on examples.

3 and 4 are side views of the recording/reproducing core in the embodiment of the present invention. 5 and 6 are exploded and assembled views of FIG. 4.

In FIG. 6, an abbreviated core IA and an approximately inverted core ′: 1-f
A 1C non-magnetic auxiliary plate 5 is bonded with glass or the like, and the bonded portion of 1A and 10 constitutes a rad gap 3 for recording and reproduction. The joint between the substantially inverted core 1C and the non-magnetic auxiliary plate 5 has nothing to do with recording and reproduction. Dimension l of the substantially inverted core 1C,
There is a relationship of Is<ls, and the area where the magnetic shorting piece 6 is attached to the medium facing surface 11 is smaller than the area l. By adopting such a structure, it is possible to easily realize l of 0.2 to 0.3, and even 13! Since it is thicker, it is possible to suppress an increase in magnetic resistance in the area where the magnetic shorting piece 6 is attached, and it is also easier to attach the magnetic shorting piece 6.

In FIG. 5, an abbreviated core 1A, an abbreviated core IB, and a non-magnetic auxiliary plate 5 are joined by glass or the like, and a recording/reproducing gap 3 is formed at the joint of one person and 1B. Core 1B
The mounting of the magnetic short circuit H6 is characterized in that a 140-dimensional magnetic material is added through the glass 8, and the short circuiting piece is mounted on the section L, which consists of It1+L14+glass section 8, and on the medium facing surface! , which is larger. Figures 6 and 7
The figure shows an exploded assembly diagram of this embodiment. The substantially C-shaped core 9, the substantially machined core 1B, and the auxiliary plate 5 are joined together by glass, and the portion of the substantially C-shaped core shown in FIG. A part of the core 9 is added to 1B through glass. In this way, the fifth
As shown in the figure, l
Installation has become easier.

Although the embodiments are explained using an arrangement/reproducing core, it goes without saying that the same effect can be obtained using an erasing core.

Since the magnetic head device of the present invention has the above-described structure, it has excellent features such as a large reproduction output, simple structure, and easy manufacture in a device with a small medium diameter.

[Brief explanation of the drawing]

1 is a schematic view of the medium facing surface of the magnetic head device, FIG. 2 is an exploded view of the magnetic head device, FIG. 3 is a side view of the core, FIGS. 4 and 5 are side views of the core of the present invention, FIG. 7 is an exploded view of FIG. 5. DESCRIPTION OF SYMBOLS 1... Core for recording and reproduction, 2a, 2b... Core for erasing, 6... Recording and reproduction gap, 4α, 4b... Erasing gap 5... Non-magnetic auxiliary plate, 6... Magnetic short circuit Piece 7...Glass joint. ! +L 7th figure below 2z 3rd mouth % S figure

Claims (1)

[Claims] A recording and reproducing core having a rad gap for recording and reproducing,
In a magnetic head device provided with an erasing core having a rad gap for erasing a protruding portion of a recording trajectory recorded by the recording/reproducing head gap, 1. A recording/reproducing core and an erasing core are configured. A magnetic head device characterized in that, in the abbreviated core, the abbreviated core, and the magnetic shorting piece, the dimension of the abbreviated core in the medium sliding direction is larger in the part where the magnetic shorting piece is attached than in the medium facing surface part. . 2. The part of the above-mentioned roughly-shaped core to which the magnetic short-circuiting piece is attached has a magnetic material bonded with glass, etc. A magnetic head device that is characterized by