JPS5891520A - Polishing device of tape running surface of magnetic head - Google Patents

Abstract

PURPOSE:To control the depth size on the tape running surface of each magnetic head tip to be polished, correctly and exactly, by attaching and detaching the magnetic head tip to be polished to and from a device quickly and easily. CONSTITUTION:A titled device is constituted of a rocking base 2 for carrying a magnetic head chip 1 to be polished, its rocking mechanism 3, a holding tool 4 for holding said magnetic head tip, a long-sized polishing tape 5, and a surface plate 6 for pressing this polishing tape against the tape running surface of said magnetic head tip. The rocking base 2 in this device is supported between both free ends 21a, 22a of 2 plate springs 21, 22 parallel with each other, whose one end has been fixed to a machine base 7a, respectively, is connected to the rocking mechanism 3, is rocked in the right and left directions in the first figure, and this rocking base 2 moves by DELTAW of 2 times in the right and left directions at the time of its rocking, and by DELTAh in the upper and lower directions, and executes a circular arc-like rocking motion.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a new and improved tape running surface polishing Sa of a magnetic head.

Generally, V'rn is expressed as (l gap width, D: depth 8: effective magnetic permeability) of a ferrite magnetic head for movie theaters, and this reproduction efficiency is required to maintain high stability.

Dimensional control of depth D is considered to be particularly important. It is effective to make this depth dimension even -12 in order to adjust various electrical characteristics of the VTR, so this depth dimension is
: Polishing to an arcuate surface with tape traveling 11 it C:
Therefore, they are aligned.

1. Is the magnetic head chip made into a single piece by cutting a long cotton block-like body made electronically?

Since it is extremely difficult to accurately regulate the depth in the block state, the current situation is to limit the depth to 1 ni depth after separating it from the block. Conventionally, the depth is regulated by 6 ni in order to regulate the upper ε depth. Polishing the tape running surface of the head chip 12a, t) The part of the prefabricated block that will become the tape running surface is ground using a cylindrical grinder to form the desired circular arc surface, and then this block is cut into individual pieces. After forming a head chip on each of these tubes, attach a predetermined base plate to each tube, and attach the base plate to the disk so that the tape running surface of the head chip is at the outer periphery.
A method of polishing the tape running surface of the head chip that slightly protrudes from the outer circumferential surface of the ν cylinder by rotating the cylinder tube until a new tape surface appears one after another. A method is adopted in which the head chip obtained by cutting a block is actually assembled into a VTR, and the entire tape running surface of the head chip is polished by contacting it with an abrasive tape under conditions similar to those in which it contacts a VTR tape. ing.

However, the individual head chips obtained by cutting the block tube have large variations in their depth dimensions, and the polishing time required for subsequent depth adjustment is short (2. The polishing method is difficult to manage, and when the initial depth is large, S
Second, the tape running surface of the head chip becomes a desired circular arc surface, and there are disadvantages and drawbacks such as the incorporation into a VTR. The present invention provides a new and improved magnetic head tape running surface polishing gi11111 capable of solving the disadvantages and drawbacks of the conventional method g. Both free t of a leaf spring
lIllll two-supported rocking platform.

b. Jllll to drive the upper distribution table f swinging.

0. One end of the magnetic head chip is attached to the magnetic head chip to be polished, and the other end f is loosely connected to the pillar g fixed to the machine stand. Rotatable I: Above the rocking table C: At least one magnetic heel F chip holder pivoted.

d. A π-long abrasive tape that is movable in a direction perpendicular to the rocking direction of the rocking table and is disposed opposite to the tape running surface of the head chip.

The present invention is characterized by comprising a pressing surface plate that contacts the back surface of the upper ε abrasive tape and presses the abrasive tape against the tape running surface of the head chip.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The drawings are all representative examples of the device of the present invention. The reason for this is a schematic view of Wi, and FIG. 184 is a perspective view of the magnetic head chip to be processed by this WI device.

As is clear from Figures 181 to 83, this device comprises a rocking table 2 that supports the magnetic head chip 1 to be polished, a rocking mechanism 3 thereof, a holder 4 that holds the upper epsilon magnetic head chip, A long abrasive tape 5 and this abrasive tape are pressed against the tape running surface 12 of the magnetic head chip 4 and pressed 1
16.

The swinging table 2 in this Vl device is supported by two mutually parallel leaf springs 21° 220 whose one end is fixed to the machine stand 7, respectively, between the free ends 21a and 22b, and the swinging mechanism 3-= Connect, s! Left-right direction l in the figure: Swinging ~ This rocking table 2
Thereafter, during the swinging, it moves twice as much △W in the left-right direction and twice as much g212 in the vertical direction, and strictly C: performs an arc-shaped swinging motion.

In addition, the swinging mechanism 8 in this Sat2 is
It consists of a shaft (= attached eccentric wheel 32) and a lever 33, and this lever 38 is pivotally supported by a machine base 71 at an intermediate position l1g=, and one end of the lever 38 is loosely fitted with the pin 32a of the eccentric wheel. and the other end is directly connected to the blanket 23 of the rocking table so that the motor 3 can rotate freely.
The swinging table 2 is made to swing by changing the rotation of the swinging table 1 into a reciprocating motion g2 via the lever 33. Note that this swing mechanism 36
Second, any conventionally known rocking mechanism can be used.

Second, regarding the holder 4 for the magnetic head chip to be polished, one or more holders 4 are removably mounted on the rocking table 2 via appropriate mounting feet *24. Each of these holders has a magnetic head chip 1t-11 to be polished at one end 4a, and a play hole 411 provided at the other end 4b.
The support column 42f fixed to the Al1 stand 7b is inserted and loosely connected, and the holder itself is supported on two C axes so that it can rotate in a plane relative to the 1m mounting surface plate 24M2. The details of how each holder 4 is attached to the fixed llI24g2 are not shown directly on the inner surface. 11-sided ship: Screwed ship: Therefore, it can be rotated freely; it can be installed. The rotating shaft 43 of each holder 40 needs to be aligned with the center axis of the circular arc surface to be exposed on the tape running surface 1aC of the fH head chip 1. Left-right direction 5 in Fig. 112: When the 1M rotation shaft 43 swings together with the swing table 2, the other end 4b of the holder 4 is loosely fitted to the fixed support 42C. Then, the tape running surface 1& of the magnetic head chip 1 held at one end C2 of the holder 4 comes into contact with the surface of the abrasive tape 50 disposed opposite thereto, and runs left and right (2, strictly speaking) on the surface of the holder 4. is arcuate i: it moves and the desired arcuate surface is polished.

The abrasive tape 5 stile has, for example, G on its surface.

It consists of a long tape in the form of a film on which abrasive grains of φ6000 are attached.
The guide a-ra 52.51 presses the fixed rock 6.
As a result, the front surface of the magnetic head 1 to be polished 1 is continuously fed so that the new surface of the polishing tape 6 always faces the front surface of the magnetic head 1 to be polished.

Further, regarding the pressing force setting II, the polishing tape 5 is brought into contact with the tape running surface of the magnetic head 1 to be polished with an appropriate pressing force, and this hole is formed by, for example, a stage feeding motor. 61 ward = Therefore, it is attached to the tip of the carriage 62 that moves back and forth, and the linear school 634:! The distance from the rocking table 2, in other words, the desired depth 1b of the magnetic head to be polished during tape travel 1filaj2 is detected, and after reaching the predetermined depth value after being set, the spark-out time t-interval is determined. The nib is controlled so that it automatically returns to its original position.

Next, to explain the operation in the present invention W1, this device uses the Dave running surface 1a of the magnetic helad tip 1.
%-I to be polished: is the magnetic head chip 1 to be polished first?
, its attachment to the holder 4g: First, it is pasted on a suitable base plate 44. At this time, the head chip 1 should be firmly attached to the base 44a of the base plate 44 in the reference area.
The lower ff1ilc of the depth 1b is accurately positioned and pasted under a mirror at the height of the J-foot. Next, the base plate 44f is fixed to the holder X4 supported on two axes on the rocking table C with reference to the bottom side 44af of the base plate 44f.

In this way, one to a plurality of magnetic head chips 1
After mounting on the rocking table 2, the motor a1 of the drive mechanism is activated, and while continuously supplying the abrasive tape 5t, the stage feed motor 61 is activated and the pressing surface plate 6t is oscillated. The stand 2 is approached and the polishing tape 5 is magnetically pressed against the tape running surface 1aC of the Radchip 1 to start polishing.

During the polishing operation, the tape running surface 1a of the magnetic head chip moves in an arc shape by combining the swinging motion of the rocking table 2 and the rotational motion about the rotating shaft 43 of the holder 40, As a result, the tape running surface 1a of the head chip is aligned with the rotation axis 4.
2 so that it is polished along an arcuate surface centered at 3. Further, the head chip 1 is mounted on the machine 2 by a rocking table 21.
Since the vertical movement of Δh is repeated through the swinging movement of △W,
Due to this vertical movement and the inherent elasticity of the polishing tape 5, the uneven movement of the tape ff1la&! The circular surface is also polished with a slight bulge in the axial direction.

The polishing work on the tape running surface of the magnetic Herad tip described above is done using Suppression II! The process continues while determining the depth 1b of the tape running surface using the linear scale 63 of No. 6, and when it is detected that the depth has reached the desired value of 5:.

Immediately, the polishing operation is stopped and the polished magnetic head chip fwJg is removed from the stand 2, thereby completing the polishing cycle.

As explained above, with the fNli of the present invention, it is possible to quickly and easily attach and detach a plurality of magnetic head chips to be polished, and the tape running surface of each magnetic head chip to be polished can be quickly and easily mounted. It is possible to precisely and accurately control the depth dimension of the direct grinding, and the efficiency of polishing work and the product yield can be significantly improved.

In turn, the amount of polishing needed can be reduced, so
Its practical value is enormous.

[Brief explanation of the drawing]

Figure 181 is a schematic sL view of the second polishing H1111 of the present invention. Figure s2 is an enlarged plan view of the main part, figure 3 is a schematic side view (2)
It is. @4@'l The above polishing smt: This is the cause of the oblique view of the magnetic head chip being polished. 1...Magnetic head chip to be polished. IIL... Tape running surface, 1b... Depth dimension, 2
...Rocking table 1. 21.22...Plate spring, 28...Bracket, 2
4... Mounting surface plate. 3... Swinging mechanism, 81... Motor, 32... 4M core 111°83
···lever. 4... Head chip holder, 41... Loose fitting hole, 42... Fixed column, 48...
Rotation axis, 44...Base plate. 5... Abrasive tape, 51... Tape reel, 52.58... Guide a-ra. 54... Pinch roller 6... Suppression board, 61... Stage feed motor. 62...Reciprocating table, 63...Linear scale. Figure 1 Figure 2 Figure 3 Figure 3 Figure 4

Claims (1)

[Scope of Claims] a. A π-oscillating table supported between the two ends of two fixed mutually parallel plate springs. b. The above lllIh stand f [dynamically driven mechanism. O, Attach the magnetic head chip to be polished to one end, and connect the other end loosely to the column at the temperature R:WA, so that the tape running surface of the head chip (=the central axis between the arcs to be exposed) 2. Can be rotated along the 6 directions. 6. Upward swinging. g. At least one pivotally supported magnetic head chip holder. d. Can be moved in a direction C. A long abrasive tape is placed opposite to the tape running surface of the head chip. ・The back side of the abrasive tape is brought into contact with the tape running surface of the head chip. 1. A tape running surface polishing device for a magnetic head, comprising a suppression surface plate.