JPH0731779B2 - Magnetic head processing equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head processing apparatus, and more particularly, to a plurality of ring-type magnetic head cores in which the distance between the magnetic gaps of adjacent ring-type magnetic heads is, for example, The present invention relates to a tip core processing device for a magnetic head of a type arranged on a head base so as to be 1 mm or less.

(Prior Art) Conventionally, as a magnetic head used in a video tape recorder (VTR) or the like, for example, two magnetic heads are provided on one head base.
A double head chip type magnetic head having a ring type head core (hereinafter referred to as a head chip) is well known.

FIG. 7 is a perspective view of a conventional double head chip type magnetic head 10, and FIGS. 8 (A) and 8 (B) are a front view and a plan view of the double head chip type magnetic head of FIG.

As shown in the figure, a double head chip type magnetic head 10
Is on one head base 13 having slits 13a,
Two head chips 11 and 12 sandwiching this slit 13a
Are juxtaposed. Since the head chips 11 and 12 have substantially the same structure, the structure will be described by taking one head chip 11 as an example. The head chip 11 is the winding window 11
a having a winding groove 11b and a C core body 11c made of a ferromagnetic material such as MnZn ferrite, and a plate-shaped I core half body 11d made of a ferromagnetic material and having a narrow width. Both core halves 11c, 11d are butted against each other via a gap material to form a magnetic gap 11f on the tape sliding surface 11e, and the winding window 11a is formed from both sides of the magnetic gap 11f on the tape sliding surface 11e. A track width regulation groove 11g is formed over
It has a structure in which glass is molded in 11g.

The other head chip 12 has the same structure, but when it is mounted on the head base 13, the I core half 12d
Is opposed to the I core half body 11d of one head chip 11.

In such a double head chip type magnetic head 10, when the tape sliding surface 11e (12e) and a magnetic tape (not shown) are slidably contacted to each other and run, the edge portions of the opposing I core halves 11d and 12d are a kind of pseudo. There is a problem in that it acts as a gap and significantly deteriorates the image quality.

Therefore, the applicant of the present invention has proposed the tip structure of the I-core halves 11d and 12d for preventing the pseudo gap in the previously filed Japanese Patent Application Laid-Open Nos. 60-182006 and 62-60104.

FIG. 9 is a partially enlarged perspective view showing the shape of the I core half body for preventing the pseudo gap. As shown in the figure, this tip structure has an I-core half body 11 on the side in sliding contact with the magnetic tape surface.
The cross-sectional shapes of the edges 11h and 12h of d and 12d are arcuate or linear V-shaped so that they are not parallel to the magnetic gaps 11f and 12f of the head chips 11 and 12. As a result, the pseudo gap effect is lost, crosstalk is prevented from occurring, and the image quality is prevented from being degraded. By the way, in the above magnetic head, the lapping work for processing the respective edges of the I-core half pairs 11d and 12d on the side in sliding contact with the surface of the magnetic tape into an arcuate or linear V-shape is performed manually. . FIG. 10 is a perspective view for explaining the conventional lapping work. As shown in FIG. 10, the two head chips 11 and 12 are attached to the head base 13.
Head chip under a microscope (not shown)
While confirming the finished shapes of 11 and 12, it was done by hand using a stick 15 with a wrapping tape attached to the mount.

(Problems to be Solved by the Invention) The interval between the facing I core halves 11d and 12d is 300 to 600 μm.
Since it was very narrow and had to rely on manual work under a microscope, the processing dimensions and shapes were different, and there was variation in the pseudo gap suppression effect of each head chip.

It was easy to cause cracks in the I core halves 11d and 12d due to manual work while confirming with a microscope.

There is a problem that it requires skill and is disadvantageous in terms of cost due to poor workability.

(Means for Solving the Problems) The present invention has been made to solve the above problems, and a head chip in a magnetic head in which a plurality of head chips (magnetic head cores) are arranged on one head base. A magnetic head processing apparatus for forming the edges of the tape sliding contact surface side and the opposite side of each other in an arc shape or a linear shape which is not parallel to the effective magnetic gap, and a. Means for running, b. Means for bending the running wrapping tape into a substantially <shape, c. A blade having a guide portion having an acute cross section for supporting the bent wrapping tape, e. An object of the present invention is to provide a magnetic head processing apparatus comprising a means for moving and swinging to the side of a bent wrapping tape.

(Embodiment) FIGS. 1 (A) to 1 (C) are perspective views for explaining a first embodiment of a processing method using a magnetic head processing apparatus according to the present invention.

First, as shown in the figure, a blade 20 and a wrapping tape 21 each having a V-shaped portion having an angle α at the tip and extending in the x direction are prepared, and the wrapping tape 21 is V-shaped. Along the portion 20a (x direction), the vehicle is run at a speed of v so as to form the bent portion 21a of <shape.

Next, as shown in FIG. 1A, the bent portion 21a of the wrapping tape 21 and the gap formed by the I core halves 11d and 12d of the double core type magnetic head 10 facing each other are fitted together. The magnetic head 10 is pushed in the y direction which is perpendicular to the x direction, and the edge portions of the I core halves 11d and 12d are brought close to the wrapping tape 21.

Next, as shown in FIG. 7C, when the magnetic head 10 is tilted counterclockwise with respect to the central axis 22 of the magnetic head, the diagonal line of the four corners of the end edges of the I core halves 11d, 12d is drawn. One pair of upper corners first comes into contact with the bent portion 21a of the wrapping tape 21 so that the lapping tape 21 is polished from this portion, and a rotational force that does not destroy the magnetic head 10 is applied to give a desired inclination angle of β. It can be provided at the edges of the I-core halves 11d, 12d. Similarly, by tilting the magnetic head 10 in the clockwise direction with respect to the central axis 22, a desired tilt angle can be given to the other pair of corner portions, and as a result, a linear V-shape is formed. .

Needless to say, the above-mentioned polishing can be achieved by alternately applying a swinging motion to the central axis 22 in the clockwise direction and the counterclockwise direction.

By the above polishing, it is possible to manufacture the magnetic head 10 having a V-shape having a constant inclination angle at the edge portions of the I core halves 11d and 12d without variation.

FIG. 2 is a perspective view of an essential part of the invention for explaining a second embodiment of the processing method using the magnetic head processing apparatus according to the present invention. The same reference numerals are given and the description is omitted.

In the figure, reference numeral 30 is a blade used in the second embodiment, and a notch 30a is formed in the V-shaped portion 20a. Further, 31 is an air suction hole, which is formed inside the notch 30a and on the V-shaped portion 20a corresponding to the running surface of the wrapping tape 20, and these air suction holes 31 are provided outside the blade 30. Connected to a vacuum pump (not shown).

When polishing, apply the wrapping tape 21 to V
The bent portion 21a is formed by running along the character-shaped portion 20a, and the wrapping tape is formed by the suction force of the air suction holes 31.
21 is in close contact with the V-shaped portion 20a and can travel stably.

FIGS. 3 (A) to 3 (H) show the second machining method using this device.
It is an explanatory view for explaining an example, and it explains below using the figure. First, as shown in (A) and (C) of the same drawing, a magnetic field is formed so that the gap formed by the one-core half bodies 11d and 12d facing each other is fitted to the bent portion 21a of the wrapping tape 21 running on the cutout portion 30a. When the head 10 is moved in the y direction, the I core half body 11d,
The edge of 12d contacts the wrapping tape 21, and the wrapping tape 21 is deformed from the V-shape drawn by the dotted line to the one drawn by the solid line.

The edge shapes of the I core halves 11d and 12d at that time are as shown in FIGS.
It is almost parallel to 11f and 12f.

In this state, as shown in FIG. 1 (C), the magnetic head 10
When the magnetic head 10 is oscillated with respect to the central axis 22 of
The insulation of the I core halves 11d and 12d is as shown in FIG.
Since the deformation of the wrapping tape is polished until it is sent to the original V shape, the edges of the I core halves 11d and 12d are finally unbalanced with respect to the magnetic gaps 11f and 12f as shown in FIG. And the tip is sharpened into a V shape.

When the magnetic head is further moved in the y direction in this state, the wrapping tape 21 is deformed as shown by the solid line. However, after the magnetic head 10 is further swung several times in this state, the wrapping tape 21 is changed to the dotted line. As shown in, when polishing is stopped while it is still deformed and deformed, the edges of the I core halves 11d and 12d are rounded with a rounded tip as shown in FIG. To be polished.

As described above, in this embodiment, since the notch 30a is formed under the wrapping tape 21, even if the swing angle is set to a desired angle during polishing, the I core half body
Since a large force is not applied to 11d and 12d, the magnetic head is not destroyed and stable polishing with excellent yield can be performed.

Next, the configuration of the magnetic head processing apparatus according to the present invention will be described.

FIG. 4 is a plan view showing the outline of a magnetic head processing apparatus 40 according to the present invention, and FIGS. 5 and 6 are partially enlarged perspective views of the essential parts of the magnetic head processing apparatus shown in FIG. .

In FIG. 4, 41 is a supply reel for the wrapping tape 21, and 42 is a take-up reel. Reference numeral 43 denotes a traveling path of the wrapping tape 21, and the wrapping tape 21 pulled out from the supply reel 41 is sandwiched between a pair of rotatable pinch rollers 44 as shown in FIG. 5, and then the blade 20 (30). First convex V-shaped roller 45 having the same shape as the V-shaped portion 20a of
The blade 20 (30) is bent into a V shape through
The second convex V-shaped roller 46 is attached to the character-shaped portion 20a and further.
And a take-up reel 42 via a second pair of pinch rollers 47.
It is formed so as to be wound around.

Reference numerals 48 and 49 denote concave V-shaped rollers for tape regulation, which have concave portions 48a and 49a that can be fitted to the V-shaped portion 20a of the blade 20 (30). Wrapping tape that uses a small space created by fitting with V-shaped part 20a
The position of the wrapping tape 21 is regulated by causing the wrapping tape 21 to run.

A rocking mechanism 50 is provided on the base 51 for giving a rocking motion to the magnetic head 10 during polishing. The base 51 is configured to be movable in the y direction by a transfer mechanism (not shown).

As shown in FIG. 6, the swinging mechanism 50 generally comprises a holder 52 for holding the magnetic head 10 and a drive mechanism for giving swinging motion to the holder 52.

The drive mechanism includes a stepping motor 53, a pinion gear 54 and a rack 55 that convert the rotary motion of the stepping motor 53 into a linear motion, and a rotary shaft 57 having a pinion gear 56 that converts the linear motion of the rack 55 into a rotary motion. Consists of
The rotary shaft 57 supports the holder 52.

When the take-up reel 42 is rotated by a motor (not shown) in the traveling path 43 of the wrapping tape 21 as described above, the wrapping tape 21 is pulled out from the supply reel 41, and passes through the pinch roller 44 and the first convex V-shaped roller. The wrapping tape 21 is attached by the convex V-shaped roller 45.
Is bent into a V shape and is scored so that V of blade 20
It is attached to the character-shaped portion 20a, and further wound around the take-up reel 42 via the second convex V-shaped roller 46 and the pinch roller 47.

At this time, since the tension of the wrapping tape 21 required for polishing is determined by the pinch rollers 44 and 46, the pinch rollers 44 and 46 are provided with a tension adjusting mechanism using a frictional force.

At the time of polishing, a magnetic head is mounted on the holder 52, the entire base 51 is transferred by a transfer mechanism (not shown), and the I-core halves 11d and 12d are fitted into the bent portion 21a of the wrapping tape 21 which runs in the gap formed by facing each other. When the stepping motor 53 is rotated to the left and right, the rotary motion is converted into a reciprocating linear motion of the rack 55 via the pinion gear 54, and the reciprocating linear motion is further supported by the pinion gear 56 of the rotary shaft 57 that supports the holder 52. A predetermined swing motion can be given to the magnetic head 10 by converting it into a rotary swing motion of the rotary shaft 57 via.

(Effect of the Invention) According to the magnetic head processing method of the present invention, a plurality of head chips (magnetic head cores) are provided on one head base.
Magnetic head processing for forming an end edge of the head chip on the tape sliding contact surface side and the opposite side of the magnetic head in which is arranged in a non-parallel to the effective magnetic gap and a cross section having an arc shape or a straight shape. An apparatus comprising: a. Means for running the wrapping tape, b. Means for bending the running wrapping tape into a substantially <shape, and c. A guide section having an acute cross section for supporting the bent wrapping tape. Since it is composed of a blade and e. Means for moving and swinging the magnetic head to the bent lapping tape side, it becomes possible to mechanize the edge processing of the head chip, and manual work under a microscope as in the past. Is no longer necessary, and it is possible to accurately produce the processing dimensions and shape, and it is possible to improve the yield and provide a highly reliable and cost-effective magnetic head processing apparatus. It is something.

[Brief description of drawings]

1 (A) to 1 (C) are perspective views for explaining a first embodiment of a processing method using a magnetic head processing apparatus according to the present invention, and FIG. 2 is processing of a magnetic head according to the present invention. A perspective view of an essential part of the invention for explaining a second embodiment of a processing method using the apparatus, and FIGS. 3A to 3H are for explaining a second embodiment of the processing method using the present apparatus. And FIG. 4 is a plan view showing the outline of a magnetic head processing apparatus according to the present invention, and FIGS. 5 and 6 are partially enlarged perspective views of the main parts of the magnetic head processing apparatus shown in FIG. FIG. 7 is a perspective view of a conventional double head chip type magnetic head, and FIGS. 8 (A) and 8 (B).
Is a front view and a plan view of the double head chip type magnetic head of FIG. 7, and FIG. 9 is an I for preventing a pseudo gap.
FIG. 10 is a partially enlarged perspective view showing the shape of the core half body, and FIG. 10 is a perspective view for explaining a conventional lapping operation. 10 ... magnetic head, 11, 12 ... head chip, 11c, 12c ... C core half, 11d, 12d ... I core half, 11e, 12e ... tape sliding surface 11f, 12f ... magnetic gap 13 …… Head base, 20,30 …… Blade, 20a …… V-shaped part, 21 …… Wrapping tape, 21a …… Bending part, 22 …… Center axis of magnetic head, 30a …… Notch part, 31… … Air suction hole, 40 …… Processing device, 41 …… Supply reel, 42 …… Winding reel, 43 …… Wrapping tape running path, 44,47 …… Pinch roller, 45,46 …… Convex V type Roller, 48,49 …… Concave V-shaped roller, 50 …… Rotating mechanism, 51 …… Base, 52 …… Holder, 53 …… Stepping motor, 54,56 …… Pinion gear, 55 …… Rack, 57… …Axis of rotation.

Claims (3)

[Claims] 1. A magnetic head in which a plurality of head chips (magnetic head cores) are arranged on one head base,
A magnetic head processing apparatus for forming an edge of the head chip on the tape sliding contact side and the side opposite to each other in a non-parallel to effective magnetic gap and a cross section having an arc shape or a linear shape, comprising: a. A means for running the wrapping tape, b. A means for bending the running wrapping tape into a substantially <shape, c. A blade having a guide portion with an acute-angled section for supporting the bent wrapping tape, and e. An apparatus for processing a magnetic head, comprising: means for moving and swinging the head toward the bent wrapping tape. 2. The magnetic head processing apparatus according to claim 1, further comprising a notch formed in a part of a guide part of a blade for supporting the bent wrapping tape, and corresponding to the notch. The head chip is brought into contact with the wrapping tape at a position where the magnetic force is applied, so that the tape tension of the wrapping tape causes the wrapping tape to elastically contact the tape sliding contact surface side edge portion of the head chip. Head processing device. 3. The magnetic head processing apparatus according to claim 2, further comprising: a tape sliding contact portion and a non-tape sliding contact portion on which the bent lapping tape travels in contact with the blade. An apparatus for processing a magnetic head, characterized in that a connecting hole is formed, and the lapping tape which runs in contact with this is adsorbed to a guide portion of a blade.