JPH03230308A - Method and instrument for measuring characteristic of magnetic head - Google Patents

Abstract

PURPOSE:To attain exact measurement and improvement in workability by measuring the characteristics of a magnetic head after the correct contact position of the magnetic head and a tape is monitored and set with a monitor television by utilizing the specular surface of the tape surface. CONSTITUTION:The contact position region of the magnetic head 20 and the tape T is photographed and displayed on the monitor television 13 by a high- resolution television lens 11. While the head 20 is not positioned and set in the exact position with the tape T, the specular image of the head 20 projected on the tape T is in an inclined state and the distance on the videos at both ends of the head 20 varies. The position of the head 20 is, thereupon, adjusted to minimize the distance between the gap part of the head 20 and the gap part of the specular image by rotating a table 9 while monitoring the television 13. The characteristics of the head are measured by using a recording and reproducing circuit 10 upon completion of the position setting, by which the exact measurement and the improvement in the workability are attained.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) The present invention relates to a method for measuring characteristics of a magnetic head and an apparatus therefor.

When measuring the electromagnetic conversion characteristics of the magnetic head that should be extended, the fourth
As shown in the figure, it is necessary to bring the magnetic head 20, especially the gap G, into accurate contact with the magnetic tape T.

Currently, the position of the magnetic head with respect to the tape during measurement is determined by the measurer who visually places the magnetic head 20 on the tape.
Fine adjustments were made by moving the magnet closer to or farther away from it, and the optimal position was determined while measuring the magnetic properties.

The magnetic head is very small, about 2 mm x 2 mm (and it is not easy to position the magnetic head 20 correctly with respect to the tape T by visual inspection (it requires considerable skill). Making adjustments has the problem of increasing the number of measurements and requiring a large amount of time before starting actual measurements.

Further, the tip of the magnetic head 20 is generally R-polished, and even if the position of the magnetic head 20 with respect to the tape T is set by the above method, if the magnetic head 20 is not aligned with the tape T as shown in FIG. If the magnetic head 20 is arranged at an angle with respect to the tape T, it cannot be said that the tip gap portion G of the magnetic head 20 is accurately positioned with respect to the tape T, and correct electromagnetic conversion characteristics cannot be measured.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method and method for measuring the characteristics of a magnetic head, which can quickly and accurately position the tip gap portion of the magnetic head with respect to the tape, and can accurately measure the electromagnetic conversion characteristics of the magnetic head. The purpose is to provide equipment.

The above objects are achieved by a magnetic head characteristic measuring method and apparatus according to the present invention. In summary, the present invention arranges a magnetic head to face a tape, uses the magnetic head and a mirror image reflected on the tape surface, which is a mirror surface, and connects the gap between the magnetic head and the mirror image. This magnetic head characteristic measuring method is characterized in that the position of the magnetic head is adjusted so that the distance between the head and the gap part is minimized, and then the characteristics of the magnetic head are measured.

Such a measurement method includes a cylinder wrapped with a tape, a measuring stand disposed opposite to the cylinder and supporting a magnetic head,
a support stand that supports the measurement stand and rotates it parallel to a plane containing the tape and the magnetic head; a Z-axis direction adjustment means that supports the support stand movably in the vertical direction; and the Z-axis direction adjustment means. an X- and Y-axis direction adjusting means for carrying the cylinder and moving it in a horizontal plane orthogonal to the Z-axis, a photographing means for photographing an area near the contact between the cylinder and the tape, and a display means for projecting an image from the photographing means. The present invention is suitably implemented in a magnetic head characteristic measuring apparatus characterized by comprising the following.

Hereinafter, the method and apparatus for measuring characteristics of a magnetic head of the present invention will be described in 2.
This will be explained in detail with reference to the surface.

FIG. 1 shows a measuring device for carrying out a method for measuring characteristics of a magnetic head according to the present invention.

In this embodiment, a holder 2 is disposed at the top of a main body 1 of the measuring device, and a cylinder 3 is attached to the holder 2 so as to be rotatable around its vertical axis 3a.

A tape T is pasted around the outer circumference of the cylinder 3. Further, the vertical shaft 3a of the cylinder 3 is connected to a motor M,
It is rotated at a predetermined rotation speed.

On the other hand, on the upper part of the apparatus main body 1, adjacent to the holder 2, an X- and Y-axis direction adjustment means, ie, an XY child table 5, for moving in the X-axis and Y-axis directions is arranged. In this embodiment, the table 4 is a table that moves in a direction perpendicular to the plane of the paper in FIG. 1, and the table 5 is a table that moves in the left-right direction in FIG.

On the XY table, in this embodiment, on the table 5, a Z-axis direction adjustment means 6 using a rack and pinion method is arranged, and by turning the adjustment knob 6a, the Z-axis direction adjustment means can be adjusted. The lifting section 6b of No. 6 is moved vertically, in this embodiment, vertically. A support stand 7 is fixed to the adjustment means 6, and a shaft support 8 of the measurement stand 9 is rotatably fitted to a vertical shaft 7a implanted in the support stand.

Further, a set screw 8a is screwed into the shaft support 8, and by screwing the set screw, the shaft support 8 is aligned with the vertical shaft 7a.
It can be fixed against

A magnetic head 20 is mounted on the measuring table 9 at a position facing the cylinder 3 and further the tape T. Further, on the measuring table 9, a recording/reproducing circuit 10 constituting an electromagnetic conversion characteristic measuring device is further provided, and is electrically connected to the magnetic head 20. Note that the horizontality of the XY table 4.5, support stand 7, measurement stand 9, etc. has been sufficiently adjusted in advance, and there is no need to adjust the perpendicular layer of the magnetic head 20 attached to the measurement stand 9 with respect to the tape T. It is said that

According to the present invention, above the cylinder 3 and the measuring table 9,
Photographing means 1 For example, a model TV manufactured by Kyowa Kogaku Kogyo Co., Ltd.
A coaxial illumination type high-resolution TV lens 11 such as -4L (trade name) is arranged, and an ultra-compact solid-state sensor camera 12 is installed at its base end, and an area near the contact position between the magnetic head 20 and the tape T is provided. configured to monitor. Further, images taken with the high-resolution TV lens 11 and camera 12 are displayed on a monitor TV 13.

Next, the operation and operation of the measuring device configured as described above will be explained.

According to the present invention, the contact position area between the magnetic head 20 and the tape 10 is photographed by the darkest means such as the high-resolution TV lens 11 and displayed on the monitor television 13. Images at that time are shown in FIGS. 2 and 3.

First, the magnetic head 20 is adjusted by adjusting the XY child table 5 and the Z-axis direction adjusting means 6, and rotating the measuring table 9 parallel to the plane containing the magnetic head 20 and tape T. Preliminary positioning is performed visually or while watching the monitor television 13 so that the leading end of the tape T faces the position of the tape T on the cylinder 3.

FIG. 2 is an image before the positions of the magnetic head 20 and tape 10 are set. That is, the magnetic head 20 attached to the measuring table 9 is not yet accurately positioned with respect to the tape T, and is in an inclined state with respect to the tape T.

Furthermore, a mirror image 20' of the magnetic head 20 reflected on the tape T, which has a mirror surface, is also displayed on the monitor television 13. The mirror image 20' is formed at a position symmetrical to the magnetic head 20 with the mirror surface position of the tape T as the center. Therefore, in the state where the magnetic head 20 is inclined with respect to the tape T, the distance G on the image at both ends of the magnetic head 20,
,G, are different.

According to the present invention, by rotating the measuring table 9 while watching the monitor television 13 and rotating the magnetic head 20 together with the measuring table 9, the distances G+ and G2 can be determined as shown in FIG. GG2, that is, the distance between the gap G of the magnetic head 20 and the gap G' of the mirror image 20° is made to be the minimum. As a result, the gap G of the magnetic head 20 is accurately positioned with respect to the tape.

Furthermore, if necessary, the XY child table, especially the table 5, is driven, and the gap part G of the magnetic head 20 and the mirror image 20° are
Adjustment is made so that the gap G° and the distance between the two become close to each other and the distance between them is minimized.

As a result, the gap G of the magnetic head 20 is brought into contact with the tape T, and the positioning of the magnetic head 20 with respect to the tape T is completed.

After the contact state between the magnetic head 20 and the tape T is obtained in this manner, measurements are made using the recording/reproducing circuit 10, and the electromagnetic conversion characteristics of the magnetic head 20 after final fine adjustment are determined.

As described in detail above, the present invention makes use of the fact that the surface of the tape T is a mirror surface to set the correct contact position between the magnetic head and the tape while monitoring it on a television monitor. It has the advantage that the position of the gap portion of the magnetic head relative to the tape can be adjusted quickly and accurately. Therefore, according to the present invention, the electromagnetic conversion characteristics of a magnetic head can be accurately measured, and the time and labor required for measurement can be significantly reduced, and workability can be improved.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an apparatus for carrying out the measurement method according to the present invention. FIG. 2 is a diagram showing the state before the position of the magnetic head is set on the monitor television. FIG. 3 is a diagram showing the state immediately before setting the position of the magnetic head on the monitor television. FIGS. 4 and 5 are diagrams for explaining the positional states of the magnetic head and the tape. 3 Niji cylinder 4.5: XY child table: Measuring table 10: Recording/reproducing circuit 11/High-resolution TV lens 12; Camera 13/Monitor TV 20/6 Oxygen head T tape

Claims (1)

[Claims] 1) A magnetic head is arranged to face the tape, and a gap portion of the magnetic head is formed into a mirror image by using the magnetic head and a mirror image reflected on the surface of the tape, which is a mirror surface. A method for measuring characteristics of a magnetic head, comprising adjusting the position of the magnetic head so that the distance between the magnetic head and a gap portion thereof is minimized, and then measuring characteristics of the magnetic head. 2) A cylinder wrapped with a tape, a measuring stand that is placed opposite to the cylinder and supports a magnetic head, and a support stand that supports the measuring stand and rotates it parallel to a plane containing the tape and the magnetic head. a Z-axis adjustment means that supports the support base movably in the vertical direction; A magnetic head characteristic measuring device comprising: a photographing means for photographing a region near the contact between the cylinder and the tape; and a display means for displaying an image from the photographing means.