JPH04206003A - Magnetic head and manufacture thereof - Google Patents

Abstract

PURPOSE:To conform the track height of a head chip on a head base to a target value with high accuracy, and to simplify a cylinder assembly process by sticking an intermediate base, to which the head chip is pasted, to the head base. CONSTITUTION:An upper-side intermediate base 5 and a lower-side intermediate base 6 obtained by obliquely machining one surfaces of a rectangular parallelopiped constituting an intermediate base 2 are used, a head chip 3 is bonded with the upper-side intermediate base 5, the inclined planes of the upper- side intermediate base 5 and the lower-side intermediate base are mutually faced oppositely and bonded, and the lower-side intermediate base 6 is cemented with a head base 1. That is, since the intermediate bases 5, 6 having structure capable of adjusting the height of the head chip 3 are formed, the dispersion of size generated by the cutting of the head chip 3 and the bonding with the intermediate base 5 of the head chip 3 is absorbed, and size (h) from e underside of the intermediate base to the lower end of the gap of the head chip 3 can be conformed accurately to a target value. Accordingly, the adjustment of the height of a track after a head is mounted to a cylinder is unnecessitated, thus simplifying a cylinder assembly process.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic head in which the position of a head chip gap relative to a head base is controlled with high precision, and a method for manufacturing the same.

BACKGROUND ART In a recording/reproducing device in which a cylinder rotates, such as a video tape recorder (VTR), the position of the gap between a plurality of head chips on the cylinder is, for example, the lower end of the gap on a plane perpendicular to the axis of rotation of the cylinder. is adjusted so that it is positioned.

Since the head chip is attached to the cylinder mounting surface of the head base, variations in the distance (track height) from this surface to the bottom of the gap are due to the spacer inserted between the head and the cylinder, or the pusher protruding from the nolinder. Adjusted by pressing.

Problems to be Solved by the Invention When a large number of head chips are mounted close to each other on a cylinder, the structure in which the height of the transistor is adjusted by protruding a pusher from the cylinder has significant dimensional limitations. Furthermore, when multiple head chips are mounted on top of a piezoelectric bimorph element for dynamic trunk trunking, the overall weight of the trunk height adjustment mechanism, including the trunk height adjustment mechanism, is limited due to the driving force of the piezoelectric element. Together with the above constraints, this makes it difficult to realize such a system.

The present invention is an attempt to solve the above-mentioned problem.In a recording/reproducing device such as a VTR in which a cylinder rotates, when a plurality of heads are mounted on the cylinder, each head can be adjusted without having to adjust the position of the plurality of heads. It is an object of the present invention to provide a method for manufacturing a magnetic head and a magnetic head thereof such that the lower end of the gap of the magnetic head is at a predetermined height with respect to the cylinder surface.

Means for Solving the Problems In order to achieve the above objects, a magnetic head according to the present invention comprises:
An intermediate base to which a head chip is attached is attached to the head base, and the intermediate base has a structure in which two members each having one surface of a rectangular parallelepiped diagonally processed are adhered to each other at their slopes.

According to the above-mentioned means, since there is an intermediate base having a structure in which the height of the head chip is adjustable, it is possible to absorb the dimensional variations caused by cutting the head chip or adhering the head chip to the intermediate heir. The dimension from the bottom of the base to the bottom of the hentochinob gap can be accurately adjusted to the target value. The shape of the lower end surface of the intermediate base has better flatness than the shape of the end surface obtained by cutting the navel tip.
When attached to the Radbase, the track height from the head base surface to the lower end of the head gap closely matches the target alignment adjusted with the intermediate base. According to the head with such a configuration, the track height is regulated with high precision, so there is no need to adjust the track height after the head is attached to the cylinder, and the cylinder assembly process is simplified.

Furthermore, if a piezoelectric bimorph element is used as a head base, it is possible to realize a dynamic trunking head with a very lightweight structure and equipped with multiple head chins.

EXAMPLE Hereinafter, an example of a magnetic head of the present invention and a method of manufacturing the magnetic head will be described with reference to the drawings.

FIG. 1 is a perspective view of the magnetic head of the present invention, FIG. 2 is a front view of the magnetic head viewed from the sliding surface side of the head chip, and FIG. 3 is a side view of the magnetic head viewed from the direction of arrow A in FIG. be. 1, 2, and 3, 1 is a head base, 2 is an intermediate base, 3 is a hent tip, 4 is a gear knob of the head tip, and 5 and 6 are diagonal sides of a rectangular parallelepiped that constitutes an intermediate base 2. (Hereinafter, 5 is referred to as the upper intermediate base and 6 is referred to as the lower intermediate base). Ma is the lower end surface of the intermediate sheath, and 8 is the surface of the het heath 1. The tochinobu 3 is glued to the upper middle base 5, the upper middle hese 5 and the lower middle head 6 are glued with their inclined surfaces facing each other, and the lower middle hese 6 is glued to the head base 1.
is glued to.

The dimension from the lower end surface 7 of the lower intermediate hese 6 in contact with the head base 1 to the lower end of the gap 4 of the head chip 3 is as follows:
Since it changes depending on the mutual positional relationship of the two intermediate bases, the positions of the intermediate bases are fixed to each other so as to have a predetermined dimension. If the flatness of the lower end surface 7 of the intermediate base and the surface of the helad base 1 is good, the surface 8 of the head base 1
The dimension from to the bottom of the gap is equal to h. When such a head is attached to a VTR cylinder, the position of the lower end of the magnetic gap is based on the surface 8 of the head base 1, so the track heights of the plurality of magnetic heads on the cylinder are accurately set to a predetermined value. This eliminates the need for a 1lii height section, and greatly simplifies the cylinder assembly process. In addition, even when the head base l is a piezoelectric bimorph element, the intermediate head 2 whose gap end position is adjusted is
By joining these together, it is possible to obtain a very lightweight magnetic head equipped with multiple head chips with matching track heights. In addition, when manufacturing a multi-track hendo in which a plurality of hentochinob 3 are mounted on one head base 1,
If a terminal plate for the head winding is provided on the intermediate base 2, the head chip 3 can be sorted after checking the head characteristics with the head chip 3 adhered to the intermediate base 2. Therefore, after evaluating the head chip 3 using another head base 1, the head chip 3 can be selected. It is no longer necessary to unwind and remove the winding of the head chip 3, and it is also possible to prevent a decrease in yield due to damage to the head chip 3.

Next, a method for manufacturing the magnetic head of the present invention will be explained using FIG. 4. The head chip 3 is attached to the upper intermediate base 5
Glue with epoxy adhesive.

Due to variations in the cutting position from the bar where the gap 4 was formed and the waviness of the end surface of the cut hent tip 3, the position of the lower end of the gap 4 of the hent tip 3 glued to the intermediate base has an error of about 10 μm with respect to the target. be. Therefore, the upper intermediate base 5 is placed on the lower intermediate base 6, and the dimension from the end surface 7 of the lower intermediate heath to the lower end of the gear knob 4 is measured on the measuring table 9. The upper intermediate base 5 is slidably adjusted in the direction of inclination of the slope so that h becomes the target dimension, and fixed with adhesive. For example, if an ultraviolet curing resin is used as the adhesive and ultraviolet-transparent glass is used as the intermediate base 2, the adhesive can be applied to the inclined surface of the intermediate base 2 and then ultraviolet rays can be irradiated through the intermediate heath. , it is possible to fix the intermediate heath 2 in a height-adjusted state. In addition, it is possible to fix the height without changing it by heating the epoxy resin and pouring it onto the contact surface while the height is adjusted. After that, the head chips 3 with the same height from the lower end surface 7 of the intermediate base are placed together with the intermediate base 2 on the head base l, and the upper intermediate base 5 is bonded onto the lower intermediate base 6 in the same manner. Glue. If the surface precision of the head base 1 is equivalent to that of the measurement table 9, the dimension from the head base 1 to the lower end of the gap 4 will be equal to h.

Regarding other embodiments of the method of manufacturing a magnetic head of the present invention,
This will be explained using FIG. The lower intermediate base 6 is held by a holder 10 and is movable on the head base 1.

The upper intermediate base 5 is pressed and pressed by 11 and 12, and can be moved back and forth in the direction of the arrow on the lower intermediate base 6. After adjusting the height of the gap 4 of the hent tip 3 glued on the upper intermediate base 5 by adjusting the push screws 11 and 12, the head tip 3 is fixed on the head base 1 by moving the holder 10. It can be installed at any location. Furthermore, even when a plurality of Herad chips 3 are mounted on one head base 1, by sequentially adhering them on the head base 1, it is possible to manufacture a magnetic head with accurately uniform track heights. According to the manufacturing method of this embodiment, even if the surface quality of the head base 1 is somewhat poor, bonding can be performed while checking the height of the gap on the head base l, so that even if the intermediate base 2 can be held by the head holder 10, If so, it is possible to assemble a magnetic head with accurate dimensions.

Effects of the Invention As is clear from the above explanation, according to the present invention, it is possible to obtain a magnetic field in which the track height of the head chip on the head base matches the target value with high accuracy.
When installing multiple magnetic nodules on a cylinder,
The gear position I of each magnetic henode can be adjusted to a predetermined height with respect to the cylinder surface without adjustment, and the cylinder assembly process can be simplified. Furthermore, even when multiple head chips are mounted on a piezoelectric bimorph element, there is no need for a complicated track height adjustment mechanism for each chip. It is possible to install

Further, according to the method for manufacturing a magnetic head of the present invention, it is possible to easily assemble, adjust, and fix a magnetic head in which the trunk height of the bottom 7 dots on the head base matches the target value with high accuracy. .

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the configuration of an embodiment of the magnetic head of the present invention, FIG. 2 is a partial front view of the magnetic head seen from the sliding surface side of the hendochisob, and FIG. 3 is an arrow shown in FIG. 1. FIG. 4 is a side view of the magnetic head seen from direction A, and FIG. 5 is a diagram for explaining the first manufacturing method of the magnetic head of the present invention.
The figure is a diagram for explaining a second manufacturing method of the same magnetic head. 1...Head base, 2...Middle base, 3...Hendochisop, 4...Gap, 5...Upper middle base, 6・・・・・・
Lower intermediate base, 7... Lower end surface of intermediate base, 8
...Head base surface, 9...Measurement stand, 10...Holder. Name of agent: Patent attorney Haruaki Ogata et al.22 Figure 1
/---Head base 2-11 Listen to the middle - Also 3-1-Head 乎・Tub σ Fig. 2 4-11 Gearf 0

Claims (3)

[Claims] (1) A magnetic head in which an intermediate base to which a head chip is attached is attached to the head base, and the intermediate base is constructed by gluing together two slopes of a member obtained by processing one surface of a rectangular parallelepiped obliquely. (2) After gluing the head chip to the upper member of the two members with one side of the rectangular parallelepiped diagonally processed to make up the intermediate base, slide that member against the lower member in the direction of the slope. The feature is that the dimension between the gap end of the head chip and the lower end surface of the intermediate base is adjusted to a predetermined value, the slopes are glued together, and then the tape is placed and glued at a predetermined position on the head base. 2. The method of manufacturing a magnetic head according to claim 1. (3) On the head base, after gluing the head chip to the upper member of the two members in which one side of the rectangular parallelepiped that constitutes the intermediate base is processed diagonally, attach that member to the lower member with an inclined surface. By sliding and adjusting in the inclination direction, the dimension between the gap end of the head chip and the head base surface is adjusted to a predetermined value, and at the same time, after aligning the head chip to a predetermined position, the respective interfaces are bonded. 2. The method of manufacturing a magnetic head according to claim 1, wherein the head chip is fixed on the head base by using a magnetic head.