JPS61115209A - Magnetic head - Google Patents

Abstract

PURPOSE:To obtain a magnetic head which has a core for recording and reproducing and a core for erasing and is used for a floppy disk suitable particularly for high- density recording by providing grooved end edges consisting of a nonmagnetic base body on both sides of the gap for recording and reproducing of the core for recording and reproducing and winding respectively coils to the core for recording and reproducing and the core for erasing. CONSTITUTION:The core 1 for recording and reproducing of the magnetic head is formed by coupling three plate-shaped members made of ferrite to a core shape and the coils are wound on the core 1. The core 4 for erasing of the magnetic head is formed of thin films 4a consisting of 'Permalloy(R)' or other magnetic material and a plate-shaped magnetic material member 4b connecting a pair of said thin films 4a. The coil is wound on the core 4 as well. Each of the films 4a is stuck by vapor deposition, sputtering, plating, etc. on the slope 5a of the nonmagnetic base body 5 produced of ceramics, etc. into a right-angled triangle in the sectional shape. The core for erasing is formed of the thin films stuck to the nonmagnetic base body and the magnetic material member connecting the thin films and therefore said core is easily produced while the prescribed accuracy is maintained. Since the core for erasing is formed more thinly near the gap for recording and reproducing, the increase in the recording density is made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a magnetic head that accommodates a recording/reproducing core and an erasing core used in a floppy disk, and is particularly suitable for high recording density.

``Prior Art'' Conventionally, as shown in FIGS. 1 and 2, there has been a side-erasing type magnetic head in which erasing cores B are provided on both sides of a recording/reproducing core A to accurately erase both sides of a recorded track. was used. This type of magnetic head is difficult to manufacture because the erasing core is assembled on both sides of the recording/reproducing core with a predetermined spacing between them. After forming grooves at predetermined intervals corresponding to the gap of the erasing core, the eraser core is cut into thin pieces to form an erasing core, and the erasing core and the recording/reproducing core are assembled into the grooves of the fixed frame. An easy manufacturing method is disclosed in JP-A-57-10318.

In addition, in order to increase the recording density, some magnetic heads have thinner recording/reproducing cores and thinner erasing cores. ``Problems to be Solved by the Invention'' disclosed in Japanese Patent Application Laid-open No. 150421/1980 discloses a structure in which the cores are formed in layers by sequential vapor deposition, sputtering, etc., and a boundary layer is provided by etching to form a gap between each core. When cutting a block-shaped core to form an erasing core as in the conventional technology, it is difficult to form a thinner core to achieve higher recording density, and it is also difficult to fix the cut core or recording/reproducing core. It took a lot of effort to manufacture, as it had to be assembled into the grooves of the frame.

Furthermore, when manufacturing the conventional thin film magnetic head by repeating vapor deposition or sputtering of the magnetic layer and the insulating layer, the manufacturing cost is high, so a low cost one is desired.
, ``Means for Solving the Problems'' ``The present invention solves the above-mentioned problems, and the erasing core is formed by connecting the ends of each magnetic thin film attached to a pair of non-magnetic substrates to a magnetic material. A recording/reproducing core is sandwiched between the pair of nonmagnetic substrates. The groove of the erasing core is formed by slightly notching each non-magnetic substrate at the tip of the thin film, and the grooved edges of each non-magnetic substrate are located on both sides of the recording/reproducing gap of the recording/reproducing core. I decided to do so. Furthermore, coils are wound around the recording/reproducing core and the erasing core, respectively, to form a recording/reproducing head and an erasing head, and these two form a magnetic head.

When the magnetic disk passes over the gap between the recording and reproducing cores of the magnetic head, information magnetic flux is generated in the recording and reproducing head and the information is read, and information is read by receiving the information magnetic flux from the recording and reproducing core. It will be written. During a write operation, in order to prevent crosstalk with adjacent tracks, the erase head operates to generate erase magnetic flux in a direction perpendicular to the write track, thereby erasing redundant information on both sides of the write track. Furthermore, since the erasing core is formed in a microscopic S film on the front surface of the magnetic head, high-density recording is possible.

``Example'' Next, the magnetic converter according to the present invention will be explained with reference to FIGS. 3 to 5. The recording/reproducing core 1 of the AI head is formed by combining three plate-like members made of ferrite into a core shape. Gap 2 is formed. A portion of the recording/reproducing core 1 on the back side from the gap 2 is joined with a glass material 3. Note that the recording/reproducing core l is wound with one coil (not shown).

The erasing core 4 of the magnetic head is formed of a thin film 4a of permalloy or other magnetic material, and a plate-shaped magnetic member 4b connecting the pair of thin films H4a, and this erasing core 4 is not shown. The coil is wound. Thin 1g 4a
is deposited by vapor deposition, sputtering, plating, etc. on the inclined surface 5a of the nonmagnetic substrate 5, which is made of ceramics or the like and has a right triangular cross section. The non-magnetic substrate 5 has an inclined surface 5a
11m1B is formed at one end edge of the magnetic head, and a thin film 4a is attached from this groove 6 through the inclined surface 5a to the end edge on the back side of the magnetic head.

Then, the recording/reproducing core 1 is sandwiched between a pair of nonmagnetic substrates 5 to which RBQ4h is attached, and the grooves 6 of the nonmagnetic substrates 5 are adjacent to both sides of the gap 2 of the recording/reproducing core 1.

It is assembled to do so. That is, the recording/reproducing core is located at the center of the V-shaped groove formed by the pair of nonmagnetic substrates 5. Then, the space between the recording/reproducing core 1 and the inclined surface 5a of the nonmagnetic substrate and the groove 6 are filled with glass material 7, and the nonmagnetic substrate 5 and the recording/reproducing core 1 are bonded together. Furthermore, each of the thin films 4& attached to the pair of non-magnetic substrates 5 has a magnetic member 4b having a coil wound at each end on the back side.
connected by.

According to the above embodiment, 1. It has become easy to manufacture a side erase magnetic head with a recording density of 1357 PI or more, which was difficult to manufacture in the past.

In addition, in the above, the groove 6 of the non-magnetic substrate 5 corresponds to the recording/reproducing core l.
However, if the grooves 6 are arranged on both sides of the side where the gap 2 of the recording/reproducing core is provided, the grooves 1 and 1 do not have to match.
After attaching thin IQ 4 a to % 6, groove 6 the glass material.
However, groove 6 was filled with tII11i! Shallow to the thickness of
When the recording/reproducing core 1 is sandwiched between the pair of non-magnetic substrates 5, a minute gap may be left between the pair and the glass material may be filled in that portion.

"Effects of the Invention" As described above, the magnetic eraser of the present invention has an erasing core formed of a thin film attached to a non-magnetic substrate and a magnetic member connecting the thin films. Easy to maintain and manufacture. Moreover, since the erasing core is formed thinner near the recording/reproducing gap, the recording density can be increased.

[Brief explanation of drawings]

Fig. 1 is a front view of a conventional magnetic head, M2 factor is a cross-sectional view taken along the line 1 in Fig. 1, Fig. 3 is a perspective view of the magnetic head of the present invention, and Fig. 4 is a non-magnetic substrate with a thin film attached. The perspective view and FIG. 5 are front views of the magnetic head of the present invention. 1; Core for recording and reproducing 2: Core for erasing 4: Core for erasing 4a: Thin film 5, non-magnetic substrate 6: Groove ■ Fig. 2

Claims (2)

[Claims] (1) In a magnetic head having a recording/reproducing core and an erasing core, a groove is provided at the edge of the non-magnetic substrate, and
A magnetic thin film extending through this groove to the other edge of the non-magnetic substrate is attached to the surface of the non-magnetic substrate, and a recording/reproducing core is sandwiched between a pair of non-magnetic substrates to which this magnetic thin film is attached, and each non-magnetic The grooved edges of the magnetic substrate are positioned on both sides of the recording/reproducing gap of the recording/reproducing core, and each end of the thin film attached to each non-magnetic substrate opposite to the groove side is connected by a magnetic member. magnetic head. (2) On both sides of the recording/reproducing gap of the recording/reproducing core,
The magnetic head according to claim 1, wherein the grooves of each non-magnetic substrate are positioned.