JPS61184711A - Thin film magnetic head - Google Patents

Abstract

PURPOSE:To prevent the mixture of noises into the reproduced signal due to discharging by connecting an electrode electrically to a conductive substrate directly through a hole of an insulated layer or via a gap layer of a conductive magnetic material and therefore shunting the static electricity generated at the electrode by the shifts of an opposite recording medium to the earth through the substrate. CONSTITUTION:An insulated layer 12 is set on a conductive substrate 10 and has a hole 11 reaching the substrate 10. Then the 1st magnetic pole 13 of a soft magnetic material is put on the layer 12 so as to have a contact with the substrate 10 through the hole 11. A gap layer 15 having a rear closure part 14 opened is set on the electrode 13. A coil pattern 17 is added via an insulatd layer 16. Then the 2nd electrode 18 is provided on the pattern 17 with connection secured through the part 14. Then the substrate 10 is polished up to the position shown by an alternate long and short dash line 19 from the end face of the substrate. Thus both electrodes 13 and 18 are connected electrically to the substrate 10 through the hole 11 of the layer 12. Then the substrate 10 is held by a device via a conductive material. Thus those electrodes are kept at a potential equal to that of the device frame.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a thin film magnetic head for a magnetic disk device.

[Conventional technology]

As shown in FIG. 3, a conventional thin film magnetic head has an insulating protective film 2 on a conductive substrate l, and a first magnetic pole 3 made of a soft magnetic material and a conductive or non-conductive After forming the gap layer 4, the insulating layer 5, the conductor coil 6, the insulating layer 7, and the second magnetic pole 8 made of soft magnetic material in this order, the end face A of the gap portion is polished.

[Problem that the invention seeks to solve]

In the above configuration, the potential is determined because the conductor coil 6 is used in connection with an external circuit.

However, since the magnetic poles 3 and 8 are surrounded by an insulator, the potential is not determined. Therefore, when static electricity is generated due to the movement of the medium (magnetic disk) facing the head, the potential of the magnetic pole increases and discharges to the surroundings, causing a problem in that noise is mixed into the reproduced signal.

[Means for solving problems]

The present invention provides a thin film magnetic head that solves the above problems, and its means are such that an insulating layer is provided on a non-magnetic conductive substrate, and magnetic poles and coils are formed on the insulating layer by thin film technology. The head is a thin film magnetic head characterized in that a hole reaching the substrate is provided in a part of the insulating layer, and the magnetic pole is electrically connected to the substrate through the liquid hole.

[For production]

By electrically connecting the magnetic pole to the conductive substrate, the thin film magnetic head can prevent static electricity generated in the magnetic pole due to movement of the opposing magnetic disks to escape to the ground through the substrate, thereby preventing discharge.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a diagram showing a first embodiment of the present invention, in which a is a plan view and b is a sectional view taken along line bb in FIG.

In this embodiment, as shown in the figure, an insulating layer 12 having a hole 11 reaching the substrate is provided on a conductive substrate 10, and a first magnetic pole 13 is formed from a soft magnetic material on the insulating layer 12 through the hole 11. A gap layer (insulator) 1 provided in contact with the substrate 10 and having a rear closure portion 14 opened thereon.
5 is provided, a coil pattern 17 is further provided via an insulating layer 16, and a second magnetic pole 18 connected at the rear closure portion 14 is provided on top of the coil pattern 17, and then polished from the end surface of the substrate to a line shown by a dashed line 19. It is what was done.

In this embodiment configured in this way, the magnetic poles 13° 18 are electrically connected to the substrate 10 through the holes 11 in the insulating layer 12, so if the substrate is held in the device with a conductive material, the magnetic poles can be connected. It can be kept at the same potential as the equipment frame.

Next, a second embodiment will be explained with reference to FIG. In the figure, a is a plan view, and b is a sectional view taken along line bb in figure a, and the same parts as in FIG. 1 are designated by the same reference numerals.

This embodiment is different from the previous embodiment in that the first magnetic pole 13 is directly electrically connected to the hole 11 of the insulating layer 120 provided on the substrate 10, and the gap layer 15 is In contrast to the insulating material, in this embodiment, the gap layer 15 is formed of a conductive non-magnetic material, and this is used as the insulating layer 12.
The operation and effect are exactly the same as those of the previous embodiment.

[Effects of the Invention] As explained above, according to the present invention, the magnetic pole can be electrically connected to the conductive substrate through the hole provided in the insulating layer directly or through the gear 7.1 layer of conductive magnetic material. By doing so, static electricity generated in the magnetic poles due to the movement of the opposing recording medium can be released to the ground through the substrate. This makes it possible to prevent noise caused by discharge from being included in the reproduced signal.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a first embodiment of a thin film magnetic head of the present invention, FIG. 2 is a diagram for explaining a second embodiment of the present invention, and FIG. 3 is a diagram showing a conventional thin film magnetic head. FIG. In the figure, 10 is a conductive substrate, 11 is a hole, 12 is an insulating layer, 1
3 is a first magnetic pole, 14 is a rear closure part, 15 is a gap layer, 16 is an insulating layer, 17 is a coil pattern, 18
indicate the second magnetic pole, respectively.

Claims (1)

[Claims] 1. In a thin film magnetic head in which an insulating layer is provided on a non-magnetic conductive substrate and a magnetic pole and a coil are formed thereon by thin film technology, a hole reaching the substrate is provided in a part of the insulating layer. What is claimed is: 1. A thin-film magnetic head comprising: a hole; and a magnetic pole is electrically connected to a substrate through the hole. 2. The thin film magnetic head according to claim 1, wherein the magnetic pole and the substrate are electrically connected through a conductive non-magnetic material formed in a gap between the magnetic poles.