JPH02236807A - Magnetic head manufacturing method - Google Patents

Abstract

PURPOSE:To drastically decrease the fluctuation in a gap depth by forming at least the gap depth-regulating parts of winding windows after working of head sliding surfaces. CONSTITUTION:The sliding surfaces are polished by using a lapping tape so as to attain prescribed front end radii. The winding windows 5 are formed in the positions apart by the gap depth D from the sliding surfaces of the respective head chips 1 of the magnetic head 4, which is finished to the sliding surface shape. Ultrasonic machining using fine abrasive grains and machining using laser light are possible for forming the window. The wiring window 5 of the respective head chips 1 are opened to the places apart by the prescribed positions from the head sliding surfaces after the head chips 1 are stuck to a head base 2 and the head sliding surfaces are polished; therefore, the gap depth can be regulated without having the sticking errors of the chips 1 to the head base 2 and without having the influence of the fluctuations in the radius shape at the time of the polishing of the front surface. The head having the uniform head gap depth value is thus obtd. even when the many chips 1 are mounted on one head base 2.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method of manufacturing a multi-track magnetic head suitable for recording and reproducing high-rate signals.

2. Description of the Related Art In recent years, systems that handle wideband signals, such as high-definition VTRs and digital VTRs, have been actively developed. In order to record and reproduce these wideband signals, research is being carried out on increasing the relative speed between the tape and the head and on creating multi-channels. In conventional analog recording, when performing multi-channel recording, very high accuracy was required for the track height and gap distance between heads, but with digital recording, it is possible to digitally process the playback signal, so the gap distance can be This no longer requires so much precision, and it has become possible to attach multiple head chips to a single head mounting board (head base) and perform multi-channel recording.

Problems to be Solved by the Invention When a plurality of heads are mounted on one head base, the distance between the respective head chips should be as small as possible in order to ensure stable contact with the tape. In the case of a head that uses multiple such small head chips attached to a single head base and installed in the window of a rotating cylinder, the accuracy of the gap depth is lower than when using a separate head base for each head chip. It becomes very difficult to get it out. In other words, in the conventional system, if the gap depth of one head chip on the head base is managed during the head front inspection, some error in the mounting position of the head chip with respect to the head base can be corrected when the head base is mounted on the rotating cylinder. However, when attaching multiple head chips to the head base, the direction, height, and
All variations in shape when the front surface is polished result in variations in gap depth. For example, set the gap spacing to 0.6m.
When four chips are pasted as m, and if the head front surface R is 10±1 mm, the gap depth of the heads at both ends will have an error of about 8 μm. Further, assuming that the head chip mounting error is 10 μm, the total error is 18 μm, which is unacceptable as a gap depth error.

The present invention aims to solve the problems of the prior art.

Means for Solving the Problems The present invention includes the steps of attaching a plurality of head chips to the tip of a head base, polishing the recording medium sliding portion of the head chips into a predetermined shape, and then polishing the sliding portion of the head chips. The present invention is characterized in that the magnetic head is manufactured by a step of forming at least a gap depth regulating portion of the winding window at a position separated from the surface by the gap depth.

According to the head manufacturing method of the present invention, the winding window of each head chip is placed at a predetermined distance from the head sliding surface after the head chip is attached to the head base and the head sliding surface is polished. Since it can be opened, the gap depth can be regulated without the influence of errors in attaching the head chip to the head base or variations in the R shape during front polishing, and even when many head chips are mounted on one head base, the gap depth can be adjusted Heads with uniform depth values can be obtained.

Examples Examples of the present invention will be described below with reference to the drawings.

A first embodiment of the head manufacturing method of the present invention will be described with reference to FIGS. 1 to 3. Width 0.8mm, length 2mm, thickness 0.2mm at the tip of brass head base 2
A 4g4 mm head chip is attached. The head chip 1 has a structure in which a metal magnetic film with a thickness equal to the track width is sandwiched between nonmagnetic ceramic substrates, and the portion where the magnetic gap 3 is formed is bonded via the nonmagnetic film.

The recording medium sliding portion of the magnetic head 4 is polished using a rubbing table so that it has a predetermined tip radius as shown in FIG. Next, as shown in FIG. 3, a winding window 5 is formed in each head chip of the magnetic head 4 whose sliding surface has been finished, at a position spaced apart from the sliding surface by a gap distance D. As a method for forming the winding window, ultrasonic processing using fine abrasive grains or processing using laser light is possible, and the winding window can be formed into the desired shape without affecting the pre-formed magnetic gap. can be formed. The processing conditions are 1'9 kHz for the ultrasonic processing machine.
, 50W for about 10 seconds, YA. Output 500 using harmonic λ = 532 nm, which is twice the G laser.
It took about 1 minute at mW.

In the above embodiment, an example was shown in which the entire winding window was formed.
As shown in FIG. 4 (FIG. 5 is an enlarged view of circle A in FIG. 4), the winding window 5 is formed before the gap is formed, and only the gap depth regulation 66 is formed using a laser beam. It is also possible to process it.

According to this method, since the portion to be processed is small, it is possible to process the entire wire-wound window in a shorter time than when processing the entire window using light.

In this way, actually 20 llm by conventional method.
It was possible to reduce the variation in gap depth to 5 μm or less.

Effects of the Invention According to the present invention, in a multi-track head in which a plurality of head chips are mounted on one head base, sticking errors and head sliding surface polishing can be reduced when a head chip with a winding window processed in advance is used. The problem of variations in gap depth due to errors in the tip radius of the calendar can be significantly reduced by forming at least the gap depth regulating portion of the winding window after processing the head sliding surface.

[Brief explanation of drawings]

1 to 3 are process diagrams showing the method for manufacturing the head of the present invention,
4 and 5 are diagrams showing a method of manufacturing a head according to a second embodiment of the present invention. 1...Head chip, 2...Head base, 3...
- Magnetic gap, 4... Magnetic head, 5... Winding window, 6... Gap depth regulation hole. Name of agent: Patent attorney Shigetaka Awano

Claims (1)

[Claims] After attaching a plurality of head chips to the tip of the head mounting board and polishing the recording medium sliding portion of the head chip into a predetermined shape, a plate is placed at least at a position separated by the gap depth from the sliding surface of the head chip. A method of manufacturing a magnetic head, comprising the step of forming a gap depth regulating portion of a winding window.