JPS63173210A - Cylinder grinding jig for magnetic head - Google Patents

Abstract

PURPOSE:To execute grinding of a tape sliding surface of a block by controlling the depth length of the block with high accuracy, by attaching a reflecting mirror onto a reference surface at a prescribed angle against the end face of a magnetic head adhesive block. CONSTITUTION:A block 1 formed by joining a pair of core half bodies 1a, 1b through a magnetic gap 2 is allowed to about on orthogonal reference surfaces 4a, 4b formed on a jig 4 and installed onto this jig 4, and to a cylinder grinding jig of a magnetic head used for grinding a tape sliding surface 3 of the block 1 by oscillating this jig 4, a reflecting mirror 7 is attached at a prescribed angle against the end face of the block 1 on the reference surfaces 4a, 4b. Accordingly, in a state that the block 1 has been installed to the jig, the end face of the block 1 reflected on the reflecting mirror 7 can be seen by using a microscope, etc., and in the course of grinding of the tape sliding surface 3, the depth length can be measured directly with high accuracy. In such a way, the depth length at the time of grinding can be controlled with high accuracy.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a jig for manufacturing a magnetic head, and is particularly used for grinding the tape sliding surface of a magnetic head into a cylindrical shape. The present invention relates to a cylindrical grinding jig suitable for.

(Prior art) During the process of manufacturing a magnetic head, a magnetic head adhesive block (hereinafter simply referred to as There is a step of grinding the tape sliding surface 3 of the block 1 into a cylindrical surface with a radius of curvature R, as shown in FIG.

Conventionally, this processing has been carried out using a jig 4 as shown in FIG. 11 and a method shown in FIGS. 12 and 13. That is, the jig 4 has reference surfaces 4a and 4b formed at right angles to each other on the upper surface of a vertically elongated member having a substantially rectangular cross section, and a center 5 of a cylindrical grinder shown in FIG. 13 is formed on the end surfaces of both ends. A fitting hole 4G is formed. As shown in FIG. 12, the block 1 is bonded to the jig 4 by contacting the reference surfaces 4a and 4b of the jig 4 with two orthogonal surfaces in the longitudinal direction of the block 1, respectively, as shown in FIG. As shown in the figure, the grinding wheel 6 of the cylindrical grinder is attached to the tape sliding surface 3 of the block 1.
bring it into contact with. Then, cylindrical traverse grinding of the tape sliding surface 3 of the block 1 is performed while rotating the grinding wheel 6 at high speed while swinging the jig 4 in the direction of arrow A, and moving it in the directions of arrows B and C. In this processing,
It is important to grind so that the depth length, which is the length of the magnetic gap 2 from the end of the winding groove 1C formed in the block 1 to the tape sliding surface 3, becomes a predetermined length. For this reason, conventionally, before mounting the block 1 on the jig 4, the first
As shown in Fig. 4, the depth length Do from the end face of the tape sliding surface 3 side of the block 1 is measured, and after the block 1 is mounted on the jig 4, the depth length Do of the block 1 from the tape sliding surface 3 side is measured, and as shown in Fig. 15, the depth length Do from the tape sliding surface 3 side is measured. Measure the height H2 to the end face on the tape sliding surface 3 side of 1, measure the height H3 during grinding as shown in Fig. 16, and calculate Do-(H2-H3) to the target depth length. ) were to end the grinding process when they matched. At this time, these values Do, Town.

H3 was measured using a micrometer or the like.

However, according to the above conventional method, the depth length measurement during grinding is carried out from the reference surface 4a of the jig 4 to the block 1.
Because this is done indirectly by measuring the height H3 to the tape sliding surface 3 of
There was a problem in that an error occurred when measuring the height H3 from the top and the depth length could not be measured accurately.

(Problems to be Solved by the Invention) The present invention indirectly measures the depth length after grinding, which was a problem with conventional cylindrical grinding jigs for magnetic heads, by measuring the height of the block. This solves the problem that errors occur when mounting the block on the jig or measuring the height, making it impossible to measure the depth accurately and the depth length after grinding does not match the target value. It is an object of the present invention to provide a jig for cylindrical grinding of a magnetic head, which can grind the tape sliding surface of a block by precisely controlling the depth length.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention forms a block formed by joining a pair of core halves through a magnetic gap in a jig. Cylindrical grinding of a magnetic head used for grinding the tape sliding surface of the block into a cylindrical surface by mounting it on this jig in contact with the perpendicular reference plane and swinging the jig. A reflecting mirror that forms a constant angle with respect to the end face of the block is attached to the reference plane on the jig.

(Function) According to the above configuration, the end face of the block reflected in the reflector can be seen using a microscope etc. while the block is mounted on the jig, and the depth length can be accurately adjusted during grinding of the tape sliding surface. Can be easily measured directly.

(Example) Hereinafter, an example of a jig for cylindrical grinding of a magnetic head according to the present invention will be described with reference to the drawings.

An embodiment of the present invention is shown in FIGS. 1 to 4.

In these figures, the same or equivalent parts as in the conventional example shown in FIGS. 12 to 16 are denoted by the same reference numerals, and the explanation thereof will be omitted. The feature of this embodiment is that a reflecting mirror 7 is provided on the reference surface 4a, facing the end face of the block 1 mounted on the jig 4, and having a predetermined angle with respect to this end face.

As shown in FIG. 3, the reflecting mirror 7 is raised from the reference plane 4a and is fixedly mounted on the base 8, and has a cross section PQT shaped like a triangular prism. And PPQQ side and PPT
1 and 4a are mirror surfaces, respectively, at a constant angle θ1. It is tilted at θ2. At this time, the height from the bottom of block 1 to the depth end is defined as HD,
If the height from the reference plane 4a to the apex P of the reflecting mirror 7 is expressed as, the size is such that it satisfies the relationship Ho > ho = h p > H3. Also, the base 8 of the reflecting mirror 7
As shown in FIG. 4, the terminal 9 is provided with a connecting terminal 9, which is detachably fixed to a mounting hole 10 formed in the reference surface 4a of the jig 4. Explain the effect of the example. As shown in FIG. 5, the reflector 7 attached to the reference surface 4a of the jig 4 is
When viewed from a direction perpendicular to a, an image of the end face of the block 1 reflected by the mirror surface can be seen. The depth length seen by this image. and the actual depth length is D=D.

There is a tanθ relationship. Therefore, if the inclination angle θ is known, D can be easily determined by measuring Do. Moreover, the space for installing this reflecting mirror 7 is at least PQXcosθ +p T X as shown in FIG.
The length of CO2O3 is sufficient, and a plurality of reflecting mirrors 7 can be installed in a small space. Note that it must be removed when grinding is performed.

According to this embodiment, the depth length of the end face can be directly measured while the block 1 is mounted on the jig 4, and accurate measurement can be performed with small measurement errors.

FIG. 6 shows another embodiment of the present invention, in which the axial direction of the triangular prism forming the reflecting mirror 7 is made perpendicular to the reference plane 4a. In this embodiment, the shaded area is a mirror surface, and measurements are taken from the direction of arrow G. In this embodiment, the actual depth length and the reflected image depth length are independent of the angle formed between the mirror surface and the reference surface 4a. is equal to

The mounting structure of the reflector 7 is such that the connection terminal 9 is attached to the jig 4 side, and the mounting hole 10 is connected to the reflector 7 as shown in FIG.
It may be formed on the side. Alternatively, as shown in FIG. 8, a notch 11 may be formed on the jig 4 side, and a wedge-shaped protrusion 12 may be formed on the bottom surface of the reflecting mirror 7 to fit therein.

[Effects of the Invention] As described above, according to the present invention, when this block is mounted on a jig for cylindrical grinding of the tape sliding surface of the block, the depth length formed on the end face of the block can be directly seen. In addition, since a reflecting mirror is provided opposite the end face of the block, the depth length can be directly and accurately measured, and the depth length can be precisely controlled during the grinding process.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of a cylindrical grinding jig for a magnetic head according to the present invention, and FIGS.
FIG. 4 is a perspective view showing the reflecting mirror and mounting portion of FIG. 1, FIG. 5 is a side view and front view showing the operation of this embodiment, and FIGS. 6 and 7. , FIG. 8 is a perspective view showing another embodiment of the present invention, FIGS. 9 and 10 are perspective views showing a block, and FIGS. 11 and 12 are perspective views showing a conventional cylindrical grinding jig. , FIG. 13 is a perspective view showing the cylindrical grinding operation, and FIGS. 14, 15, and 16 are front views showing the end face of the block. 1... Block 1a, 1b... Core half 2... Magnetic gap 3... Tape sliding surface 4.
...Jig 4a, 4b...Reference surface 7...
・Reflector agent Patent attorney Nori Chika Hiroshi Uji Figure 2 (b) (a) Figure 7 Figure 8

Claims (2)

[Claims] (1) A magnetic head adhesive block formed by joining a pair of core halves through a magnetic gap is mounted on the jig so as to be in contact with orthogonal reference surfaces formed on the jig. A jig for cylindrical grinding of a magnetic head used for grinding the tape sliding surface of the magnetic head adhesive block into a cylindrical surface shape by swinging the tool, the jig is for grinding the tape sliding surface of the magnetic head adhesive block into a cylindrical surface shape, A jig for cylindrical grinding of a magnetic head, characterized by having a reflecting mirror attached at a constant angle to the end face. (2) A jig for cylindrical grinding of a magnetic head according to claim 1, wherein the reflecting mirror is removably attached to a reference surface of the jig.