JPS6260111A - Magnetic head - Google Patents

Abstract

PURPOSE:To eliminate the interference between two head cores and to attain an effective track servo function by reducing satisfactorily the space between both cores at the contact wide with a medium to hold a shielding member between those cores and securing a satisfactorily large space at the rear part. CONSTITUTION:A multi-core magnetic head consists of cores 1 and 2 and the space between both cores is reduced satisfactorily at a part A the contact side of a medium compared with the effective track width. At the same time, a shielding member 3 of copper, etc. is also held between both cores 1 and 2. While a groove 4 is formed at a part B opposite to the part A with a sufficiently large space secured between both parts. Then a record/reproduction gap 7 and coils 5 and 6 are provided to the cores 1 and 2. Thus the satisfactory shielding effect is secured with use of the member 3 and at the same time the interference can be reduced satisfactorily between both cores 1 and 2. Thus two reproduction signals of high output levels are obtained. This secures an effective track servo function.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic head, and particularly to a multi-core magnetic head that takes servo into consideration.

[Conventional technology]

2 and 3 respectively show the first part of a conventional magnetic head. FIG. 9 is a perspective view showing a second example. As shown in the figure, in the conventional multi-I-rack magnetic head, copper or the like is placed between the two cores 11 and 12 to prevent interference between tracks. A shielding effect was provided by sandwiching the shielding material 13 of the dangerous plate with good conductivity. In other words, when trying to obtain a track servo signal by dividing one effective rack width into two for high track density and recording and reproducing, in order to prevent interference between the two cores, in the first example, the core 11 In the second example, the shielding material 13 was sandwiched with a sufficiently large interval of .12, and in the second example, the interval between the cores 11 and 12 was sufficiently small compared to the effective I/rack width.

[Problems to be Solved by the Invention] In the first conventional example described above, since the distance between the two cores is large, the effective track width becomes narrow and the S/N ratio decreases, making it unsuitable for high track density. There is. Furthermore, in the second conventional example, when the track density is high, the thickness of the shielding material 13 is insufficient, so there is a drawback that interference between tracks cannot be prevented.

[Means for solving the problem 2] The multi-core magnetic head of the present invention divides the information of the effective track width into two parts and uses two cores to record and reproduce the information. The spacing between the two cores is made smaller than the effective rack width by it, and a shielding material is placed in this gap, and the spacing between the two cores is reduced to The spacing is larger than that in the first portion.

〔Example〕

Next, the present invention will be explained with reference to FIG.

FIG. 1 is a perspective view showing an embodiment of the magnetic head of the present invention.

In the figure, a multi-core magnetic head consists of two cores 1.2, and in part A on the medium contact surface side, core 1.
．． 2 is sufficiently narrow compared to the effective track width W, and a material having high conductivity such as copper is formed in this gap by a method such as vapor deposition, thereby forming a structure in which the shielding material 3 is sandwiched. On the other hand, a groove 4 is provided in a portion B remote from the medium contact surface, and the spacing between the cores 1.2 is larger than the spacing in the portion A. Further, the coils 1 and 2 each have a recording/reproducing gap 7, and are independent coils, coils 5,
6 is wrapped.

In a magnetic head having such a structure, when the information of the effective track width W on the medium is divided into two parts and recorded and reproduced using the cores 1 and 2, sufficient shielding effect can be obtained by the shielding material 3, and the groove 4, the interference between the cores 1 and 2 can be sufficiently reduced.

In this embodiment, the reproduced signals obtained from the coils 5 and 6 are compared, and the difference signal is used as an I/rack servo signal, and the sum signal is used as a reproduced signal for read data, so that special servo Efficient track servo is possible without using patterns.

〔Effect of the invention〕

As explained hereafter, the present invention makes the gap between the two cores sufficiently narrower than the effective track width on the medium contact surface side, inserts a shielding material in this gap, and widens it on the opposite side. Since core interference is reduced and two high-output reproduction signals can be obtained, efficient track servo is possible.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the magnetic head of the present invention;
2 and 3 respectively show the first part of a conventional magnetic head. FIG. 7 is a perspective view showing a second example. 1.2, 11.12... Core, 3.13...
...Shield material, 1...Groove, 5.6...
...Coil, 7...Reproduction gap for recording. half! Concave Figure 2 Hand 372J

Claims (1)

[Claims] In a multi-core magnetic head that divides information of an effective track width into two parts and uses the cores to record and reproduce information, the interval between the two cores is made sufficiently smaller than the effective track width in the first part on the side that contacts the medium, and A magnetic head characterized in that a shielding material is interposed in this gap, and a distance between the two cores is made larger in a second portion on a side farther away from the first portion than in the first portion.