JPH02230504A - Magnetic head - Google Patents

Abstract

PURPOSE:To improve cross talk from a closure gap to a reading side and to improve reading characteristic by reducing the neighboring area of a closure core to a read core as much a possible without reducing the strength of the closure core. CONSTITUTION:The side opposite to the closure gap 5 of the closure core 10 i.e. the shoulder part on a read core 1 side is widely cut in almost L-shape as shown by figure 6, and the thickness (t) of a part 10b confronting with the end part of a write core at a front end is thinned in the travel direction of a magnetic medium. Also, the bottom plane of a recessed part 10a in the center of the front end of the closure core 10 is widely notched advancing the read core 1 obliquely. The strength of a core front part is weakened by thinning the thickness of the front end part 10b of the closure core 10, which decreases yield, however, since the bottom plane of the recessed part 10a is notched so as to incline considerably advancing the read core 1 side, the same function as to form a deep recessed part can be obtained without reducing the strength of the front end part of the closure core 10. Thereby, it is possible to remark ably improve the cross talk from the magnetic gap of the closure core 10.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to magnetic heads that write and read data on magnetic media, particularly digital recording/reproducing heads used in magnetic card devices and input/output sections of computers. Regarding core structure.

(Prior Art) This type of digital head has heretofore been known in which a plurality of cores are combined so that a data write magnetic gap and a data output magnetic gap overlap or are adjacent to each other. In this case, each core is arranged so that the write track width formed by the write magnetic gap is wider than the track width of the successive magnetic gap, and so that the read 1-rack exists within the write track. are doing. FIG. 5 shows a conventional example of such a digital head, and FIGS. 6(a) and 6(b) are a perspective view and a front view of a closure core in the digital head of FIG. 5. Two C-shaped cores 1 and 2 are faced to each other, and an I-shaped closure core 3 is sandwiched between them, and a U-shaped recess 3a is formed at the tip of the closure core 3. ) 1 has a convex tip, and the tip convex portion 1a of the lead core 1 is connected to the concave portion 3 of the closure core 3.
Insert the tip 2 of the other C-shaped core (light core) 2 into
a, this part serves as the central magnetic gear knob 4, and the closure core 3 and the tip 2 of the light core 2
The contact portion with a is defined as a side magnetic gap, that is, a closure gap 5.5. The read core 1 and the write core 2 are each wound with wires, and a magnetic circuit A runs through the center of the read core 1 and the write core 2 as shown by the solid line arrow, and a magnetic circuit runs between the write core 2 and the closure core 3 shown as the broken line arrow. B. When writing data, the winding current control of the write core 2 is used to write in the total width W of the central magnetic gap 4 and closure gaps 5 and 5, and the readout is performed in a narrow track by the magnetic gap 4 at the center of the write core 1. Data is read with width W'.

(Problem to be Solved by the Invention) As described above, in the conventional digital recording magnetic head in which closure tracks are formed on both sides of a read track, the U-shaped recess at the center of the front end of the closure core is 3a is not cut so deeply, but is formed to a size large enough to insert the central protrusion 1a of the lead core 1, and the core width of the front end of the closure core facing the light core on both sides of the recess, that is, the magnetic The core shape has a core thickness T along the medium running direction which is also close to the length of the convex portion 1a of the lead core 1. In such a structure, the adjacent portion between the lead core 1 and the closure core 3 becomes long, and the entire front end of the lead core on both sides and the back side is surrounded by the recess 3a at the front end of the closure core 3. The magnetic circuit B for the closure track generated between the write core and the read core A and the magnetic circuit A for reading from the write core to the read core are close to each other at the front end protrusion of the read core, and the magnetic circuit A between the write core and the read core is connected to the magnetic circuit B for the closure track from the closure gap. Crosstalk increases and read characteristics deteriorate. Further, in the conventional structure, there was a problem in that magnetic resistance increased due to the above-mentioned core shape, and data reading performance by the read core deteriorated.

The present invention aims to reduce the proximity area between the closure core and the lead core as much as possible without reducing the strength of the closure core.
The purpose of this invention is to improve crosstalk from the closure gap (crosstalk to the reading side) and provide a magnetic field with improved reading characteristics.

(Means for Solving the Problems) The present invention includes inserting a protrusion at the front end of a lead core into a recess at the center of the front end of a closure core, and joining the closure core and lead core to the end of a light core via a magnetic gap. In a one-gap type magnetic head, the shoulder portion of the front end of the closure core on the side opposite to the magnetic gap is cut into an abbreviated shape to reduce the thickness of the front end of the closure core, and the thickness of the front end of the closure core is reduced. The bottom surface is deeply cut down in an inclined manner toward the lead core.

(Example) Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of a magnetic head according to an embodiment of the present invention, and FIG. 2 is a partial plan view of the front surface of the head of the embodiment of FIG. 1, that is, the surface in contact with a magnetic medium.

Further, FIG. 3 is a perspective view of a closure core in the magnetic head of the present invention. The front end protrusion 1a of the C-shaped lead core 1 is inserted into the central recess 10a of the front end (magnetic medium contacting surface) of the closure core 10, which is shaped like a ■ as a whole, and in this state, the front end of the C-shaped write core 2 is inserted. It is similar to the conventional example shown in FIG. 5 that the magnetic gap 4 and the closure gap 5.5 are used to form a write track with a width of W and a read track with a width of W' with a width of W'. In the invention, as is clear from a comparison of FIGS. 1 and 5, the closure core 1 is located at the front end of the head.
The area in which the lead core 1 and the lead core 1 are close to each other is smaller than that of the conventional one, and both cores 13 are close to each other only on both sides of the tip of the convex portion 1a of the lead core 1.

As shown in FIG. 3, a closure core 10 according to the present invention
is the side opposite to the closure gap 5.5, that is, the lead core 1
As shown by reference numeral 6, the side shoulder portion is largely cut out in a substantially L-shape, and as a result, the thickness t of the portion 10b at the front end, which is in contact with the write core end portion, is thinner in the magnetic medium running direction. Also, the recess 10a at the center of the front end of the closure core 10
The bottom surface of the lead core 1 has a large incision in an inclined shape toward the lead core 1. When the thickness of the front end portion tob of the closure core 10 is reduced in this way, the recess 10a at the center thereof
If the depth is too deep, the strength of the front part of the core will be weakened,
However, in the present invention, the bottom surface of the recess 10a is cut so as to be greatly inclined toward the side opposite to the light core 2, that is, toward the read core 1 side, so that the front end of the closure core 3 is broken. This results in the same effect as forming a deep recess without reducing the strength of the material. For example, even if the thickness t of the front end of the closure core 3 is set to 50μ, sufficient strength is ensured for such an inclined recess, and because of this inclined shape, the recess 10a and the F core 1 are The front end portions are largely spaced apart, thereby preventing the magnetic flux flowing between the lie 1/core 2 and closure core 3 from entering the lead core 1 side, thereby achieving improvement in crosstalk. Furthermore, the magnetic resistance of the closure core 3 does not decrease.

When manufacturing such a closure core with a thin front end, as shown in FIG. 4, a closure core material 11 with a large thickness (t'), in which an inclined recess 10a has been formed in advance, is attached and fixed to the lead core 1. After that, the outer surface 11a of the closure core material 11 is turned to a position D with reference to the lead core 1 side. The gap between the front ends of the lead core 1 and the closure core material 11 is filled and fixed with a resin material, etc., so that the front end of the core is not damaged when turning the outer surface of the core material 11, and the desired core thickness can be easily achieved. t can be obtained.

(Effects of the Invention) As explained above, according to the present invention, the thickness of the front end of the closure core is made extremely thin, and the decrease in strength due to this is compensated for by making the recess in the center of the core slanted. A large gap can be secured between the recess and the front end of the lead core, and crosstalk from the magnetic gap of the closure core can be greatly improved. There are advantages such as ease of manufacturing the closure core and easy assembly of the cores.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a magnetic head according to an embodiment of the present invention, FIG. 2 is a partial plan view of the front surface of the head of the embodiment of FIG.
FIG. 3 is a perspective view of the closure core of the magnetic head of the present invention, FIG. 4 is a side view showing the state of the closure core being manufactured, FIG. 5 is a perspective view of a conventional digital magnetic head, and FIG. ) and (b) are a perspective view and a front view of the closure core of the magnetic head shown in FIG. 5. 1... Read core, 2... Light core, 3.10.
...Closure core, 4...Magnetic gap, 3a
] Oa... recess, 5... closure gap, 10
b... Front end of closure core, 11... Closure core material. Agent Patent Attorney Toshiyoshi Somekawa I:'+n

Claims (1)

[Claims] In a one-gap type magnetic head in which a convex portion at the front end of a read core is inserted into a recess at the center of the front end of the closure core, and the closure core and the read core are joined to the end of a write core via a magnetic gap, the front end of the closure core is The thickness of the front end of the closure core in the running direction of the magnetic medium is reduced by cutting out the shoulder on the side opposite to the magnetic gap into a substantially L shape, and further, the bottom surface of the recess at the center of the front end of the closure core is directed toward the lead core. A magnetic head characterized by a deeply slanted cut.