JPS61287019A - Thin film magnetic head - Google Patents

Abstract

PURPOSE:To obtain a thin film with very high recording and erasure efficiency by laminating a recording head formed by the thin film deposition method and an erasure head formed by the thin film deposition method via a conductive layer in the deposition direction. CONSTITUTION:The thin film magnetic head is formed by laminating magnetic layers 201, 201', a conductor layer 203 constituting head cores of a reproducing and recording head and head cores 204, 204' of an erasure head between an head base 207 and a protection plate 210 by sticking layers 208, 209 respectively. Thus, the gap between the recording head and the erasure head is shortened and the efficiency of recording/reproduction/erasure is improved. Further, the crosstalk generated attended therewith is minimized by arranging a conductor layer between the recording/reproduction head and the erasure head. Thus, the thin magnetic head with very high recording and erasure efficiency is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a thin film magnetic head, and more particularly to a thin film magnetic head for recording and erasing.

(Summary of the Disclosure) This specification and drawings describe a thin film magnetic head in which a recording head formed by a thin film deposition method and an erasing head formed by a thin film deposition method are stacked in the deposition direction via a conductive layer. This has made it possible to reduce the gap between the gears of the recording head and the erasing head, and to suppress the crosstalk between them, resulting in a thin film magnetic head with extremely high recording and erasing efficiency. The purpose of this disclosure is to disclose the technology that provides the following.

(Prior Art) Hereinafter, in this specification, a thin film used in an electronic camera system (hereinafter referred to as Sv) that magnetically records a video signal of one field per minute on one circular track on a magnetic disk. This will be explained using a magnetic head as an example.

In order to obtain clear reproduced images with high resolution, Sv requires a system that records one field of video signals corresponding to the first field and second field of the television signal, respectively, on adjacent tracks. There is.

Along with this, in order to suppress crosstalk between adjacent tracks, two magnetic gaps are provided on the same straight line.
A channel in-line thin film magnetic head is utilized.

FIG. 5 is a diagram showing the structure of a conventional two-channel in-line thin film magnetic head. In FIG. 0, 101 is a head substrate;
102 and 102' are head cores formed by a thin film deposition method, respectively, and 103 and 103'L! To? The wire-wound conductor has a 29-inch width, and 104° 104' is a magnetic gap portion, and the magnetic gaps 104 and 104' are formed on the same straight line.

105 is a sliding surface of the magnetic recording medium. In addition, in FIG. 5, a protective plate disposed facing the substrate 101 with an insulating layer and an adhesive layer formed between the conductor layer and the magnetic material layer is omitted.

By the way, when recording and reproducing video signals using an in-line head configured as described above, an erasing head corresponding to the in-line head is required, and conventionally, an in-line erasing head obtained by bulk cutting has been used.

(Problem to be solved by the invention) However, when a bulk erase head is used in Sv,
The gap between the recording/reproducing head and the erasing head becomes large, resulting in poor contact between the recording/reproducing head and the magnetic disk, resulting in extremely poor recording/reproducing efficiency. When a reproducing head is integrated, crosstalk between them increases and erasing signals are recorded, making it impossible to perform good recording. That is, at this time, it is necessary to suppress the amount of crosstalk to less than -40 dB, but it has been difficult to achieve this.

The present invention has been made in view of the above-mentioned drawbacks, and it is an object of the present invention to provide a thin film magnetic head with extremely high recording and erasing efficiency.

(Means for Solving the Problems) For this purpose, in the present invention, a recording head formed by a thin film deposition method and an erasing head formed by a thin film deposition method are laminated in the deposition direction with a conductive layer interposed therebetween. It is configured to do so.

(Function) By configuring as described above, it becomes possible to reduce the gap between the recording head and the erasing head, and to suppress the crosstalk between them. Accordingly, a thin film magnetic head with extremely high recording and erasing efficiency can be obtained.

(Example) The present invention will be explained below using examples.

FIG. 1 is a view of a thin film magnetic head as an embodiment of the present invention viewed from the recording medium sliding surface.
202 and 202' are respectively magnetic head gaps of the recording and reproducing heads, and 203 is a conductive layer. This conductor layer 2
03 is provided to prevent the aforementioned crosstalk from occurring between the recording/reproducing head and the erasing head. Therefore, the conductor layer 203 is made of a material with high electrical conductivity, such as copper or aluminum.

204 and 204' are the head cores of the erase head, 20
5 and 205' are the head gaps of the erase head, and 20
7 is a head substrate, 208 and 209 are adhesive layers, and 21'0 is a protection plate. Note that due to the nature of erasing, the width L1 of the recording/reproducing head shown here (see Figure 1) and the width L of the erasing head are
The relationship with L2 is set to be >L2.

FIG. 2 is a side sectional view of the thin film magnetic head shown in FIG. 1, and 211 in FIG. 0, which shares the same numbering as FIG. 1, is a winding conductor portion of the recording/reproducing head.

Two turns are formed. Further, 212 is a winding conductor portion of the erasing head.

FIG. 3 is a diagram showing the structure of the erasing head in the thin film magnetic head of FIG. 1. Since the thin film magnetic head in this example is manufactured using a thin film deposition method and photolithography technology, advanced technology is required for flattening, etc., and the number of turns of the conductor cannot be increased. It is provided to increase the number.

Further, 216 is a conductive wire connected to an external signal source. In this embodiment, a pair of erasing heads are both connected to the same step-up transformer, thereby reducing the volume by one. This is possible because the frequencies of the erasing signals are the same.

According to the thin film magnetic head configured as described above, the distance between the gap between the recording head and the erasing head can be shortened to, for example, about 50 gm.

Accordingly, the recording head and the erasing head are always in good contact with the magnetic recording medium, and the efficiency of recording, reproducing, and erasing is improved.

Furthermore, by disposing a conductive layer between the recording/reproducing head and the erasing head, it has become possible to minimize the crosstalk between them.

Furthermore, as described as a highly preferred embodiment of the present invention, by providing a common step-up transformer for supplying an erasing signal to a pair of erasing heads, the volume can be reduced, resulting in a compact and lightweight structure. It also contributes to the

FIG. 4 is a diagram showing the configuration of an erasing head in an E4 film magnetic head as another embodiment of the present invention. In this example, the winding conductor 212a is erased to the Rad cores 201, 2.
01' are wound in series.

According to the configuration of the erasing head shown in FIG. 4, the resonant frequency can be set higher than that shown in FIG. 3, and the configuration of the step-up transformer 215 can be made simpler.

(Effects of the Invention) As explained above, according to the present invention, a thin film magnetic head with extremely high recording and erasing efficiency can be obtained.

[Brief explanation of drawings]

FIG. 1 is a view of a thin film magnetic head as an embodiment of the present invention viewed from the direction of the recording medium sliding contact surface, FIG. 2 is a side sectional view of the thin film magnetic head shown in FIG. 1, and FIG. FIG. 4 is a diagram showing the configuration of the erasing head section of the thin film magnetic head as another embodiment of the present invention, and FIG. 5 is a diagram showing the configuration of the erasing head section of the thin film magnetic head shown in FIG. FIG. 3 is a diagram showing the configuration of a thin film in-line head. 201 and 201' are respectively recorded as rad core, 202,
202' are recording head gaps, 203 are conductor layers, 204 and 204' are erase head cores, 205,
205' is an erase head gap, 207 is a head substrate, and 215 is a step-up transformer.

Claims (3)

[Claims] (1) A recording head formed by a thin film deposition method,
A thin film magnetic head in which an erasing head formed by a thin film deposition method is laminated in the deposition direction with a conductive layer interposed therebetween. (2) The recording head has a plurality of recording magnetic gaps, and the erasing head has a plurality of erasing magnetic gaps arranged corresponding to the plurality of recording magnetic gaps, respectively. A thin film magnetic head according to claim (1). (3) The thin film magnetic head according to claim (2), further comprising a common step-up transformer for supplying erasing signals to the plurality of erasing magnetic gaps.