JPH0540912A - Electromagnetic conversion magnetic head and manufacture of the same - Google Patents

Abstract

(57) [Summary] [Objective] By having two gaps having different functions in one chip, it is possible to improve productivity and accuracy of the head. [Structure] A tandem gap type chip 22a, 2 in which one magnetic core material is sandwiched by two other magnetic core materials from both sides, and each joint surface is processed to form a gap.
2b, an arbitrary actuator 2 that can move this tandem gap type chip vertically to the tape sliding direction 2
Adhesively fixed to 3. [Effect] It is possible to omit the work of adjusting the gap distance dimension and the single-piece gap step dimension, and improve the manufacturing capability.
Further, it is expected that the accuracy will be improved and the quality of the finished magnetic head product can be stabilized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic conversion magnetic head for recording and reproducing on a magnetic recording medium such as a magnetic tape and a method for manufacturing the same.

[0002]

2. Description of the Related Art FIG. 4 is a plan view of a general DA type VTR magnetic head, and FIG. 5 is a front view thereof. In the figure, 1a is an Rch chip for long-time recording / reproducing, 1b is an Lch chip for long-time recording / reproducing, and 2a is Rc for standard recording / reproducing.
h chip, 2b is a standard recording / playback Lch chip, 3 is an azimuth angle indicating the inclination of a gap (magnetic gap for electromagnetic conversion), 4 is a chip holder for holding each chip 1a, 1b, 2a, 2b, 5a, 5b , 6a and 6b are windings provided on each chip, 7 is a chip holder fixing hole, 8 is a slit, 9 is a tilting stand for long-time recording / reproducing chips 1a and 1b, and 10 is standard recording / reproducing chips 2a and 2b. It is a tilting stand. The substrate for fixing the windings 5a, 5b, 6a and 6b is not shown.

Numerals 11 and 12 are dimensions when the respective chips 1a, 1b, 2a and 2b are fixed to the chip holder 4 by adhesion.
Reference numeral 11 is a gap distance dimension, and 12 is a single product gap step dimension. 13 is a gap. FIG. 6 shows FIG. 4 and FIG.
The general VTR magnetic head shown in (1) is a schematic representation of sliding on a magnetic tape which is a magnetic recording medium.
14 is a rotating drum cylinder, 15 is a magnetic tape, 16
Is a supply side tape guide, 17 is a winding side tape guide, 1
8 is a pinch roller. FIG. 7 is a front view when the VTR magnetic head is incorporated in the rotary drum cylinder.
Reference numerals 9 and 20 are dimensions at the time of assembling, 19 is a gap height dimension, 20 is an assembling gap step dimension, and 21 is a set screw for adjusting the gap height dimension 19 and the assembling gap step dimension 20.

The conventional DA type VTR magnetic head has four different types of chips 1a, 1b, 2a as shown in FIG.
And 2b are bonded and fixed to the chip holder 4 so that the chips 1a and 2b, the chips 1b and 2a are paired, and the gap distance dimension 11 and the single product gap step dimension 12 conform to the standard. When installing the rotary drum cylinder 14 as a component, the gap height dimension 1
9. Adjust the set screw 21 so that the built-in gap step size 20 conforms to the standard.
I was slightly moving 10.

[0005]

DISCLOSURE OF INVENTION Problems to be Solved by the Invention
In the A type VTR magnetic head, the chip holder 4 is
Since it is fixed to the rotating drum cylinder 14, the combination of four types of chips must be chips with different azimuth angles 3 and different modes (long time and standard) due to functional problems. In addition, since manufacturing with two gaps 13 having different azimuth angles 3 in one chip involves a great deal of difficulty, four types of chips 1a, 1b, 2a and 2b are required. They are manufactured individually, and are bonded and fixed so that the gap distance dimension 11 and the single item gap step dimension 12 fit within the standard in each combination (chips 1a and 2b, chips 1b and 2a),
Furthermore, when incorporating it into the rotary drum cylinder 14,
Gap height dimension 19, built-in gap step dimension 20
However, there is a problem in that the work of adjusting using the two set screws 21 is required.

The present invention has been made in order to solve the above problems, and chips with gaps of the same azimuth angle but different modes can be fixed to the same chip holder by adhesive bonding. By creating two gaps in the chip, it is not necessary to confirm the adjustment when the gap distance dimension and the single-piece gap step dimension are bonded and fixed. Furthermore, the built-in gap step adjustment when assembling into the rotating drum cylinder. It is also an object of the present invention to provide an electromagnetic conversion magnetic head that does not require the above, and to provide a method of manufacturing an electromagnetic conversion magnetic head having two gaps in one chip.

[0007]

In the electromagnetic conversion magnetic head according to the present invention, a chip having two gaps of different modes at the same azimuth angle is formed in one head chip, and the chip is slid on the head. It is characterized by being mounted on an actuator that can move in a direction perpendicular to the direction.

In the method of manufacturing the electromagnetic conversion magnetic head according to the present invention, the three magnetic core materials and the two joining portions thereof are joined so as to form a straight line, and then the central magnetic core material is grooved. It is characterized in that two gaps are provided so that each has a head sliding surface.

[0009]

According to the present invention, it is possible to mount gaps of different modes with the same azimuth angle on the same chip holder. Further, the adoption of one chip having two gaps makes it unnecessary to adjust the gap distance dimension, the single product gap step dimension, and the step of assembling the rotary drum cylinder.

In the method of forming two gaps in one chip, the capacity is doubled depending on the process, and workability can be improved.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a plan view showing an embodiment of the present invention, and FIG. 2 is a detailed front view of a tip portion. 22a is a tandem gap type Lch chip having a long recording / reproducing Lch gap and a standard recording / reproducing Lch gap, 22b
Is a similar tandem gap type Rch chip, 23 is an arbitrary actuator that can move vertically to the head sliding direction, and 24 is a chip hold tank part of the actuator part. Since the other configurations are the same as those of the conventional example, the same parts are designated by the same reference numerals and the description thereof will be omitted.

In the electromagnetic conversion magnetic head constructed as described above, the gap distance dimension 11 and the single-piece gap step dimension 12 are created at the chip manufacturing stage.
When the chips 22a and 22b are adhesively fixed, no adjustment work is required. Further, the work that conventionally requires two chips to be adhesively fixed can be performed by only one adhesive fixation.
Further, the number of operations can be halved even in the process before the chip adhesion and fixing. When assembling this magnetic head into the rotating drum cylinder, it is not necessary to adjust the gap height difference.

FIGS. 3a, 3b and 3c show a manufacturing process for manufacturing the above tandem gap type chip. This manufacturing process includes (a) first step (FIG. 3a): magnetic core material 25a,
25b and 25c are joined at the joining surfaces 26a and 26b.
The joint surface at this time becomes the gap 13 in the finished chip product. Narrow track processing is performed on each magnetic core material so that the gap step 12 exists in the finished chip. The joint is indicated by block 27.

(B) Second step (FIG. 3b): a step of cylindrically grinding the upper surface 28 of the above-mentioned joined block 27 to obtain a block 29.

(C) Third step (FIG. 3c): a step of inserting a groove 30 into the central magnetic core material 25b of the block 29 from above to obtain a block 31.

(D) Fourth step: a step of cutting the block 31 so that the joint surfaces 26a and 26b are inclined at an azimuth angle to obtain a chip.

However, although a large number of steps are originally required before the first step of (a) above, they are omitted because they are irrelevant to this embodiment.

In the embodiment of the present invention, the case where two gaps are required for one chip has been described, but it is needless to say that the present invention can be used when three or more gaps are required.

[0019]

Since the present invention is constructed as described above, it has the following effects.

Since two gaps are already formed in one chip, when bonding and fixing to the chip holder,
It is possible to omit the work of adjusting the distance between the caps and the step difference of the single item gap. In addition, compared with the conventional method in which two chips are bonded and fixed, only one chip needs to be bonded and fixed, so that improvement in process capability can be expected.

Further, since the number of blocks for cutting out chips is reduced to half that of the conventional one, it is expected that the capacity of each step shown in the second embodiment will be doubled.

When this head is installed in the rotary drum cylinder, it is not necessary to adjust the built-in step, so that it is possible to expect an improvement in performance even in this step.

Since the gap distance dimension, the single-piece cap step dimension, the built-in gap step dimension, etc., which have been secured by the adjustment in the past, are built in by the chip processing, it is expected that the accuracy will be improved and the quality of the head finished product will be improved. Stabilization can be expected.

[Brief description of drawings]

FIG. 1 is a plan view of an electromagnetic conversion magnetic head showing an embodiment of the present invention.

FIG. 2 is a front view of details of a chip portion of an electromagnetic conversion magnetic head showing an embodiment of the present invention.

FIG. 3 is a manufacturing process diagram of a chip of an electromagnetic conversion magnetic head showing an embodiment of the present invention.

FIG. 4 is a plan view showing a conventional magnetic head.

FIG. 5 is a plan view showing details of a chip portion showing a conventional magnetic head.

FIG. 6 is a plan view showing a usage state of a conventional magnetic head.

FIG. 7 is a front view of the details of a chip section showing a usage state of a conventional magnetic head.

[Explanation of symbols]

 3 Azimuth angle 13 Gap 22a, 22b Chip 23 Actuator 24 Chip hold tank part 25a, 25b, 25c Magnetic core material 26a, 26b Bonding surface 27, 29, 31 Block 30 Groove

Claims (2)

[Claims] 1. A head chip is formed with a chip having two gaps of different modes at the same azimuth angle, and the chip is mounted on an actuator movable in a direction perpendicular to the head sliding direction. An electromagnetic conversion magnetic head characterized by the above. 2. After the three magnetic core materials and the two joining portions thereof are joined so as to form a straight line, the central magnetic core material is subjected to grooving so that two gaps are formed on the head sliding surface. A method for manufacturing an electromagnetic conversion magnetic head, characterized in that it is manufactured to have.