JPH03147512A - Magnetic head - Google Patents

Abstract

PURPOSE:To obtain the multitrack head having a track height of high accuracy without using an intricate mechanism for adjusting the height of a head by adhering plural head chips to a head base via spacers of different thicknesses in such a manner that the track height of the respective head chips attain target values. CONSTITUTION:The head chips 3 are adhered to the head base 1 via the spacers 4 of the adequate thicknesses in order to adjust the track heights of the head chips 3. The nonmagnetic thin films formed on the end faces of the head chips 3 are also effective in addition to beads at the spacers. The head adjusted precisely in the track height of the plural heads is thus obtd. without requiring the position adjusting means, such as screws, for the head base 1 itself. The heads having the small shape are obtd. without being limited to the sizes, etc., of the screws even when plural pieces of the heads having the extremely narrow width of <=0.5mm width of the head are mounted onto the head base 1. The good head and tape sliding condition is thus obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic head having a multi-track structure 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 broadband 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, extremely high precision was required for the track height between heads (height from the head chip mounting board (head base) to the bottom edge of the magnetic core) and gap spacing. In the case of digital recording, since digital processing of the reproduced signal is possible, so much precision is no longer required regarding the gap interval. Therefore, it became possible to attach multiple head chips to one Herad base and perform multi-channel recording. In this case, in order to maintain uniform contact with the tape, efforts have been made to optimize the protruding shape of the head and the R in the track width direction.

Problems to be Solved by the Invention When multiple heads are mounted on one helad base, the distance between each head chip should be as small as possible in order to ensure stable contact with the tape. However, the width of the head chips is small. Therefore, it is extremely difficult to match the track height of each head chip using the adjustment screws protruding from the rotating cylinder as in the past, due to the accuracy of the installation of the head chips and adjustment screws.

Therefore, a magnetic head device has been proposed in which a plurality of head chips are mounted on a head base with slits formed therein, and the track height between the head chips can be adjusted on the head base using minute screws. 63-1386
Publication No. 15). However, for example, if the width of the head chip is 0.
In the case of 5-, it is difficult to manufacture due to machining even if it is tapered and widened and the interval between the adjusting screws is 1-. Furthermore, if the dimension from the end face of the head chip to the track end is precisely machined without such an adjustment mechanism, it is difficult to achieve an accuracy of 5 μm or less just by machining.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a method for attaching a plurality of head chips to a head base through spacers of different thicknesses so that the track height of each head chip reaches a target value. Constructed by gluing.

Function According to the head of the present invention, in order to adjust the track height of the head chip, the head chip is bonded to the head base through a spacer of an appropriate thickness, so the position of screws etc. is fixed on the head base itself. It is possible to obtain heads in which the track heights of a plurality of heads are precisely adjusted without the need for adjustment means. Therefore, the width of the head is 0.5
■Even when mounting multiple extremely narrow heads as shown below on a hard base, it is possible to achieve a small head shape without being limited by the size of screws, etc., and the head and tape are good. A sliding state is obtained.

Embodiment A first embodiment of the magnetic head of the present invention will be described with reference to FIG. FIG. 1 is a perspective view of a multi-track head in which three head chips are attached to the same head base. A head chip 3 is bonded to the tip of a head base 1 made of a metal such as brass or a ceramic such as alumina using an adhesive 2. The adhesive 2 contains, for example, A in FIG.
-A. As shown in Fig. 2, which is a cross-sectional view, a spacer 4 made of glass beads with a uniform particle size is mixed in, and the particle size of the glass beads is such that the track height of each head chip reaches a predetermined value. It is selected in units of 0.5 μm so that Such an adhesive is precisely positioned and applied from the tip of a nozzle with an inner diameter of 0.2 m to the head chip bonding position. With this configuration, even if the head is equipped with multiple very small head chips with a head chip width of lam or less, a multi-track head with highly accurate track height can be achieved without a complicated head height adjustment mechanism. can be obtained.

In addition to the beads described above, a nonmagnetic thin film formed on the end face of the head chip is also effective as the spacer of the present invention. A non-magnetic thin film of quartz, alumina or the like is formed on the side surface of the head chip by sputtering or the like, and the thickness of the non-magnetic film is such that the dimension from the surface of the non-magnetic film to the magnetic core is the track height. Such a non-magnetic film is prepared in advance at the head chip height (height from the end surface of the head chip to the bottom edge of the magnetic core).
It is possible to easily and accurately form the layers by measuring them, classifying them into required film thicknesses, and depositing them all together using a sputtering device or the like. For this reason, the track height of the head chip bonded to the helad base can be made to match the design value very well.

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 helad base, it is possible to obtain a magnetic head in which track heights are matched with high precision without using a complicated head configuration. . Since the track height is adjusted by a spacer inserted between the head tip and the head base, there is no problem even if the head chip width is very small.

Therefore, it is possible to realize a small-sized head despite the multi-channel structure, and to maintain good contact between the head and the tape during sliding.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the head of the present invention, and the second is a sectional view taken along line A-A of the head shown in FIG. 1...Head base, 2...Adhesive,
3... Hentochitsubu, 4... Spacer.

Claims (3)

[Claims] (1) A magnetic head characterized in that a plurality of head chips are bonded to a head mounting substrate via spacers of different thicknesses so that the track height of each head chip becomes a target value. (2) The magnetic head according to claim (1), wherein the spacer for adjusting the height of the head chip is a spherical particle of uniform particle size mixed in the adhesive. (3) The magnetic head according to claim (1), wherein the spacer for adjusting the height of the head chip is a nonmagnetic thin film formed on the end face of the head chip.