JPH01285010A - Magnetic head - Google Patents

Abstract

PURPOSE:To directly measure a gap depth in a condition in which an assembly is completed by composing a space arranged at both sides of a read/write gap part of a transparent material. CONSTITUTION:An edge peripheral part 16 of a spacer 15 is located at the side of a read/write gap 3, and the edge surface is joined through a glass for an adhesion to an I-type erasing core 5. Slider parts 17 and 18 are fitted so as to sandwich erasing cores 4 and 5 and the spacer 15 at the side faces at both sides of a core chip 11. Consequently, the edge of the read/write gap can be visually observed from an oblique direction, and by causing a magnetic head to be oblique, locating it on a microscope and irradiating a light onto it, an apparent gap depth can be measured through the transparent spacer 15. In consideration of the angle of the light transmitting surface of the spacer 15 to an observation direction, the refractive index of the glass to compose the spacer 15, etc., the real gap depth is calculated. Thus, the gap depth is successively measured correctly, and simultaneously, a faced face with a magnetic recording medium can be mirror-worked.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a magnetic head used in a magnetic disk drive that writes data to and reads data from a magnetic recording medium.

BACKGROUND OF THE INVENTION FIG. 4 shows an example of a laminate type magnetic head. In FIG. 4, 1 and 2 are recording/reproducing cores;
3 is a read/write gap in which glass as a non-magnetic material is injected into the gap between the recording/reproducing cores 1 and 2, 4 and 5 are erase cores, and 6 is an erase gap in which non-magnetic glass is injected in the gap between the erase cores 4 and 5. , 7 is the recording/reproducing core 1
, spacer made to the same width as 2, 8 is erase core 4
．． Spacers 12 and 13 made to have the same width as 5 are slider parts. The above members are each bonded by glass bonding.

Incidentally, one of the major factors that determines the performance of a magnetic head is the magnetic resistance of the read/write gap portion, which depends on the size of the gap surface. The length of the read/write gap 3 on the medium facing surface, that is, the gap length, is equal to the width of the recording/reproducing core 1.2, and this is determined by the standards of the recording method. However, the gap dibs, that is, the length of the magnetic gap in the direction perpendicular to the medium facing surface, naturally changes when the medium facing surface is polished. Therefore, in the final polishing step, the polishing work is performed while measuring the gap dibs. The conventional gap dibs measurement method is to measure the head distance from the reference surface to the medium facing surface, that is, the slider height, using the bottom surface of the slider section 12, 13 that is bonded to the gimbal as a reference surface. This value is converted into gap dibs.

However, the conversion formula used includes the following measured data as parameters.

In other words, the surface facing the magnetic recording medium is cut at the stage of the block structure before it becomes a read/write core chip during the manufacturing process. Measure the length in the direction.

The obtained data is then used as a parameter for the above conversion formula.

Problems to be Solved by the Invention However, in the method described above, the conversion formula for converting the slider height to gap dibs includes dimensions measured during the manufacturing of the recording/reproducing core as parameters. , and this parameter includes measurement error. Measurement errors are unavoidable when measuring the slider height, but if measurement errors are also included in the parameters in the conversion formula, there may be large errors in the gap dibs obtained. be. Therefore, the characteristics of magnetic heads manufactured using such a method vary widely.

The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a magnetic head in which gap dibs can be directly measured in a state where assembly is completed.

Means for Solving the Problems To achieve this object, in the magnetic head of the present invention, the spacers arranged on both sides of the read/write gap are made of a transparent material.

Function: This configuration allows the side of the read/write core to be visually observed through the spacer.

EXAMPLE A magnetic head according to an example of the present invention will be described below with reference to the drawings.

1 and 2 are a plan view and a perspective view showing a magnetic head in an embodiment of the present invention.

1 and 2, 1 and 2 are recording/reproducing cores, 3 is a read/write gap, 4 and 5 are erase cores, 6 is an erase gap, and 7 is a recording/reproducing core 1, 2.
Spacers 12 and 13 made to have the same width as , are slider parts (only the slider part 12 is shown in FIG. 2). Since the above configuration is the same as that of the conventional example, the same drawing numbers as those of the conventional example are given, and detailed explanation will be omitted.

Reference numeral 15 denotes a spacer having the same width as the erase cores 4 and 5 and made of transparent non-magnetic glass. The end line portion 16 of the spacer 15 is located on the side of the read/write gap 3, and its end surface is bonded to the ■-shaped erase core 5 via adhesive glass. 17 and 18 are slider parts, and erase cores 4 are placed on both sides of the core chip 11.
, 5 and the spacer 15.

With the above configuration, the side part of the read/write gap can be visually observed from an oblique direction as shown in FIG. Then, the magnetic head is placed on a microscope at an angle, and light is applied to the transparent spacer 15 to give an apparent gap dibs:
Measure l. And a spacer 15 for the observation direction.
The actual gap dibs: d is calculated by considering the angle of the light transmitting surface and the refractive index of the glass constituting the spacer 15. As described above, in this embodiment, the surface facing the magnetic recording medium can be mirror-finished while the gap dibs are successively and accurately measured, so that the desired gap dibs can be obtained without error.

Effects of the Invention As described above, the present invention has the spacers arranged on both sides of the read/write gap section made of transparent material.
Through the above spacer, the read/write gap can be visually observed from the side, and after assembly is complete, the gap dibs can be measured by the worker himself using a microscope, etc., or by using a measuring device that uses a laser beam, etc. It becomes possible to measure gap dibs. Therefore, in the final polishing process, the polishing work can be carried out while accurately measuring the gap dibs, and the finished gap dibs can be made to a desired length to obtain more uniform characteristics.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a magnetic head according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the same magnetic head, FIG. 3 is a perspective view of the same magnetic head, and FIG. 4 is a diagram of a conventional magnetic head. FIG. 1...Recording/reproducing core 2...Recording/reproducing core 3...Read/write gap 4...Erase core 5...Erase core 6. ...Erase gap 7...
...Spacer 15...Spacer 16...
...End part 17.18...Slider part

Claims (1)

[Claims] A first core chip provided with a magnetic gap for recording and reproducing and a first spacer formed to have the same width as the first core chip are arranged in series along the moving direction of the magnetic recording medium, and for tunnel erasure. A second core chip having an erasing magnetic gap of
The second core chip is placed so that it does not overlap with the second core chip.
A second spacer formed to have the same width as the core chip is arranged to sandwich the first core chip, and a slider part is arranged to sandwich them, and the second spacer is made of transparent non-magnetic material. A magnetic head characterized by being composed of a body.