JPH0676252A - Base for magnetic head - Google Patents

Abstract

(57) [Abstract] [Purpose] In a base of a magnetic head, one part of which is fixed to a rotary drum by a fixing screw, and the other part is pushed by an adjusting screw to adjust the height of the magnetic head 1 attached to the other part. The tilt angle formed by the head end surface and the tape is reduced to improve the electric characteristics during recording and reproduction, and the ratio of the height variation of the head 1 to the minute variation of the adjusting screw is reduced. [Structure] In FIG. 1A, one part 3a of the base 3 is provided with holes 3f extending from the other part 3b side to both sides of a position of a hole 3c through which a fixing screw is inserted. As a result, the bending position is the hole 3
The end point position of f is 3 g. In addition, in FIG.
The other portion 33b of No. 3 is provided with a hole portion 33f extending from the one portion 33a side to both sides of the adjusting screw contact position 33i. As a result, when the adjustment screw is pushed forward, the other portion 33b rotates in the direction of reducing the flank angle. In FIG. 1B, if an H-shaped hole 23f is provided in the base 23, both effects can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base of a magnetic head, which is fixed to a rotary drum by a fixing screw at one part and pushes the other part by an adjusting screw to adjust the height of a magnetic head attached to the other part. It is about.

[0002]

2. Description of the Related Art In a magnetic recording / reproducing apparatus having a rotary head, as shown in FIG. 4, a base 63 is prepared for attaching the magnetic head chip 1 to a rotary drum 2, and the magnetic head chip 1 is attached to the base 63. The magnetic head chip 1 is fixed, and one part 63a of the base 63 of the magnetic head is fixed by the fixing screw 5, and the other part 63 of the base 63 to which the magnetic head chip 1 is fixed.
The head b was pushed forward by the head height adjusting screw 6 to adjust the height, and thereby the height h of the magnetic head chip 1 was adjusted.

Conventionally, as shown in FIG. 4, the base 63 of the magnetic head is formed by forming a hole 63c through which a fixing screw 5 is inserted in one plate.
When c is fixed by the fixing screw 5 and the base 63 is fixed to the drum 2 and the other portion 63b is pushed forward by the adjusting screw 6, it is bent at a position near the base portion 63d on the other portion 63b side of the fixing screw 5, With this position as the center, the other part 63
b was rotating and rising.

Since there is no space in the space, the position of the fixing screw 5 cannot be separated from the outer peripheral surface 2a of the drum 2 so much, and is a position close to the outer peripheral surface 2a.

[0005]

Therefore, the bending position 63d is close to the outer peripheral surface 2a, and the other portion 63b is provided.
When the height position h of the magnetic head chip 1 was adjusted by rotating and rotating, the tilt angle θ between the surface of the tape 7 and the end surface of the magnetic head 1 was large. Further, since the bending position 63d is near the outer peripheral surface 2a, the other portion 63
The height position h of the magnetic head chip 1 is raised by rotating b.
Was adjusted to a predetermined height, the amount of protrusion of the end surface position of the magnetic head chip 1 in the radial direction s of the drum was significantly changed. That is, when the magnetic head chip 1 was raised to a predetermined height, the end surface position of the magnetic head chip 1 was largely retracted inward in the radial direction s of the drum 2. Therefore, there is a problem that the area where the surface of the tape 7 and the end surface of the magnetic head 1 do not come into contact with each other is increased, and the electric characteristics are deteriorated when recording and reproducing are performed.

In order to solve this problem, a spacer is sandwiched between the drum 2 and the base 63, the magnetic head height adjusting range is driven to a certain range, and then the head height adjusting screw 6 is used for adjustment. There is a method of doing so, but the work is complicated because it is necessary to create other types of spacers and it is necessary to select the spacers when mounting the head.

The bending position 63d is the outer peripheral surface 2a.
Since the adjusting screw 6 cannot be sufficiently separated from the bending position 63d, the adjusting screw 6 after the head mount expands or contracts due to temperature changes, is displaced due to backlash, etc. Small changes due to the cause
Appearing as a large height change at the end face position of the magnetic head 1,
There was a problem that the tape track could not be recorded and reproduced accurately.

Therefore, an object of the present invention is to provide a magnetic head base that solves these problems.

[0009]

In order to achieve the above object, the present invention is directed to a magnetic head mounted on the other end of the magnetic head, which is fixed to the drum by a fixing screw at one end and is pushed forward by the adjusting screw at the other end. In the base of the magnetic head whose height is adjusted, one end is provided with a hole extending from the other end to both sides of the position of the fixing screw.

Further, according to the present invention, one portion is fixed to the drum by a fixing screw, and the other portion is pushed forward by the adjusting screw,
In the base of the magnetic head for adjusting the height of the magnetic head attached to the other part, the other part is provided with holes extending from the one part side to both sides of the contact position of the adjusting screw.

Further, according to the present invention, one part is fixed to the drum by a fixing screw, and the other part is pushed forward by an adjusting screw,
An H-shaped hole is formed in the base of the magnetic head that adjusts the height of the magnetic head attached to the other part, and both sides of the H-shaped part are located on both sides of the position of the fixing screw and the contact of the adjusting screw. It extends on both sides of the contact position.

[0012]

Since the one part of the base is provided with the holes extending from the other part to both sides of the position of the fixing screw, the bending position moves toward the end point position of the hole, so that the bending position is It is located away from the outer peripheral surface of the drum.

Since the other portion of the base is provided with a hole portion extending from one side to both sides of the contact position of the adjusting screw, when the other portion is pushed forward by the adjusting screw, the end point position of the hole is centered. At the same time, the other part rotates in the direction to reduce the tilt angle.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

First, a first embodiment of the present invention is shown in FIG.
A description will be given based on FIGS. 2A and 2B.

In this embodiment, a hole is formed in one part of the base and extends from the other part to both sides of the position of the fixing screw.

In FIG. 1 (a), the base 3 is formed by pressing and chamfering a flat plate, and a hole 3c for inserting a fixing screw is formed in one side 3a.

The one portion 3a is provided with hole portions 3f extending from the other portion 3b side to both sides of the position of the hole 3c for passing the fixing screw. The hole 3f is formed by a substantially semicircular arc having a predetermined width. End point position 3g of hole 3f
In this embodiment, is the center position of the hole 3c, that is, the center position of the fixing screw. End point position 3g of hole 3f
May be extended linearly in the longitudinal direction of the base 3 from this position, respectively. In this case, the end position of the extended linear hole becomes the bending position, and the bending position is changed to the drum position. Can be further separated from the outer peripheral surface position.

The head chip 1 is fixed to the end surface of the other portion 3b of the base.

It is configured as described above, and is shown in FIG.
As shown in (b), the base 3 is fixed to the rotary drum 2 at two positions (see FIG. 2B) with the fixing screws 5. Then, the upper side surface 2c of the rotary drum 2 in FIG. 2A is opposed to a fixed drum (not shown), and the rotary drum 2 is attached to the fixed drum.

Then, the adjusting screw 6 pushes the base 3 so that the relative heights of the two heads 1 become correct. Then, the end point position 3g of the hole 3f becomes the bending position, and therefore, the bending position 3g is separated from the position of the adjusting screw 6, and at the bending position 2g, the base 3 has only the outer portion of the hole 3f. Because it bends (Fig. 1
(See (a)), the adjusting screw 6 can be rotated with a small force. Further, since the bending position 3g is away from the position of the adjusting screw 6, it is possible to finely adjust the height of the end face position of the head 1. This completes the adjustment of the relative heights of the two heads 1 to be sufficiently equal, and enables accurate recording / reproduction of the tape pattern.

Since the end point position 3g of the hole 3f becomes a bending position and the other part 3b of the base bends, the bending position 3g becomes a position apart from the outer peripheral surface 2a of the drum,
Even when the end surface of the head 1 is raised by a predetermined height, the tilt angle θ becomes small. Further, the change in the amount of protrusion of the end surface of the head 1 in the drum radial direction s becomes small. Therefore, when the magnetic tape 7 is brought into contact with the end surface of the head 1 for recording / reproducing, deterioration of the electrical characteristics is prevented.

Further, since the bending position 3g is away from the position of the adjusting screw 6, a slight change due to the environment of the adjusting screw 6 or a cause over time is prevented from appearing as a large height change at the end face position of the head 1. Therefore, the reliability of the magnetic head is improved.

Next, a second embodiment of the present invention will be described with reference to FIG.
A description will be given based on FIGS. 3 (a) and 3 (b).

In this embodiment, one part of the base is provided with a hole extending from the other part to both sides of the position of the fixing screw, and the other part of the base is provided from one part of the base to both sides of the contact position of the adjusting screw. This is the case where both holes are provided.

In FIG. 1B, as in the first embodiment, the base 23 is formed by pressing and chamfering a flat plate, and a hole 23c for inserting a fixing screw is formed in one portion 23a. I am doing it.

The H-shaped hole 2 is formed in the base 23.
3f is formed.

A hole 23m extending from one side of the base to the other side of the position of the fixing screw from the other side has an H-shaped horizontal bar portion 23k and two H-shaped side portions 23j connected to the one side portion 23a. Is formed by. H-shaped both sides 23
The end point position 23g of j is the center position of the hole 23c, that is, the center position of the position of the fixing screw. End point position 23g
May extend beyond the central position of the hole 23c, as in the case described in the first embodiment.

Next, the hole 23n extending from the one side to the other side of the adjusting screw on the other side of the base has an H-shaped horizontal bar portion 23k and an H on the other side 23b connected to the horizontal bar portion 23k.
It is formed by the character-shaped both side portions 23j. The end point position 23p of the H-shaped both side portions 23j is near the end position of the other portion 23b beyond the contact position 23i of the adjusting screw. The end point position 23p is determined so that the tilt angle θ is a value close to zero when the adjusting screw abuts the abutting position 23i and pushes the other portion 23b (see FIG. 3A).

The head chip 1 is fixed to the end surface of the other portion 23b of the base.

It is configured as described above, and is shown in FIG.
As shown in (b), the base 23 is fixed to the rotary drum 2 at two positions (see FIG. 3B) by the fixing screws 5, and the rotary drum 2 is attached to the fixed drum.

Then, the base 23 is pushed forward by the adjusting screw 6 so that the relative heights of the two heads 1 become correct.

Then, the end point position 23g of one part of the H-shaped both side parts 23j becomes the bending position, and the other part 23b.
Comes up. Since the bending position 23g is apart from the position of the adjusting screw 6, and at the bending position 23g, only the outer portion of the hole 23f of the base 23 bends (see FIG. 1 (b)), the adjusting screw 6 is applied with a small force. Can be rotated.

At the same time, the end point position 23p of the other part of the H-shaped both side parts 23j becomes a bending position, and the other part 23b rotates in a direction to reduce the tilt angle θ.

The end face position of the head 1 is adjusted to a predetermined height position and the adjustment is completed. Since the change in the tilt angle θ is small, the head height adjustment range can be widened. Further, since the bent position 23g is away from the position of the adjusting screw 6 and the tilt angle θ is small, the height of the end face position of the head 1 can be finely adjusted.

Since the tilt angle θ can be made extremely small, and the change in the amount of protrusion of the end surface of the head 1 in the drum radial direction s is small, the magnetic tape 7 contacts the end surface of the head 1 for recording and reproduction. In this case, deterioration of electrical characteristics is prevented.

Further, since the bending position 23g on the one side is away from the position of the adjusting screw 6 and the other part 23b is largely rotated in the direction of decreasing the tilt angle θ, the environment of the adjusting screw 6 and the lapse of time. A minute variation due to the cause is largely prevented from appearing as a large height change at the end face position of the head 1, and the reliability of the magnetic head is improved.

Next, a third embodiment of the present invention will be described with reference to FIG.

In this embodiment, the other part of the base is provided with holes extending from one side to both sides of the contact position of the adjusting screw.

In FIG. 1C, a substantially semicircular arc-shaped hole 33f having a predetermined width is formed so as to surround the contact position 33i of the adjusting screw. The end point position 33p of the hole portion 33f is set so that when the adjustment screw is brought into contact with the contact position 33i and the other portion 33b is lifted, the swing angle falls within a predetermined angle range.
Determined. Next, a slit 33r having a predetermined length cut out from both sides of the base plate 33 is formed at the root portion on the other side 33b side of the position of the hole 33c through which the fixing screw passes.

When the adjusting screw is brought into contact with the abutting position 33i of the base 33 fixed to the rotary drum and is pushed forward by pushing the adjusting screw forward, the notch 33r is positioned at the bending position and the other portion is bent. 33b is lifted, and the other part 33b rotates in a direction to reduce the tilt angle (not shown). Therefore, the flapping angle becomes small, and the deterioration of the electrical characteristics when the head 1 comes into contact with the tape is prevented,
Further, since the other portion 33b is largely rotated in the direction of decreasing the tilt angle, the ratio of the height change of the end face position of the head to the height change of the adjusting screw becomes small, and the fine adjustment of the head height becomes possible. And also a pair of slits 33r
Is formed, the cross-sectional area of the bent portion at the bending position becomes small, and the adjusting screw can be rotated with a small force. Since the other portion 33b largely rotates in the direction of decreasing the tilt angle, it is possible to prevent minute fluctuations due to the environment of the adjusting screw or a cause over time from appearing as a large height change at the end face position of the head 1.

[0042]

EFFECTS OF THE INVENTION By providing a hole extending from one side of the base to both sides of the position of the fixing screw from the other side, the tilt angle can be reduced and the change in the protrusion amount can be reduced. In this case, it is possible to prevent the deterioration of electric characteristics. Further, the head height can be finely adjusted, and the adjustment screw can be rotated with a small force to facilitate the adjustment. Further, it is possible to prevent minute fluctuations due to the environment of the adjusting screw and the time-dependent cause from appearing as a large height change at the end face position of the head.

By providing the other portion of the base with holes extending from one side to both sides of the contact position of the adjusting screw, the swaying angle can be made smaller, so that the deterioration of the electrical characteristics during recording and reproduction is prevented. Can be prevented. It also enables fine adjustment of the head height. Further, it is possible to prevent minute fluctuations due to the environment of the adjusting screw and the time-dependent cause from appearing as a large height change at the end face position of the head.

By providing the H-shaped hole in the base, the hole in one side and the hole in the other side can be formed at the same time, and both effects can be obtained at the same time.

[Brief description of drawings]

1A is a plan view of a base of a head according to a first embodiment of the present invention, and FIG. 1B is a plan view of a base of a head according to a second embodiment of the present invention; FIG. 7C is a plan view of the base of the head of the third embodiment of the present invention.

FIG. 2A is a partial cross-sectional view showing a state where the base of the first embodiment is attached to a drum, and FIG. 2B is a plan view showing a state where the base of the first embodiment is attached to a drum. Is.

FIG. 3 (a) is a partial cross-sectional view showing a state where the base of the second embodiment is attached to the drum, and FIG. 3 (b) is a plan view showing a state where the base of the second embodiment is attached to the drum. Is.

FIG. 4 is a partial cross-sectional view of a state where a base of a conventional head is attached to a drum.

[Explanation of symbols]

1 head 2 drum 3,23,33 base 3a, 23a, 33a one part 3b, 23b, 33b other part 3f, 23m hole provided in one part of the base and extending from the other part side to both sides of the fixing screw position 23f H-shaped hole 23i, 33i Adjusting screw contact position 23n, 33f Holes provided on the other side of the base and extending from one side to both sides of the adjusting screw contact position 5 Fixing screw 6 Adjusting screw

Claims (3)

[Claims] 1. A base of a magnetic head, wherein one part is fixed to a drum by a fixing screw, and the other part is pushed by an adjusting screw to adjust the height of a magnetic head attached to the other part. A base of a magnetic head, characterized in that holes are provided extending from the other side to both sides of the position of the fixing screw. 2. A base of a magnetic head, wherein one side is fixed to a drum by a fixing screw, and the other side is pushed by an adjusting screw to adjust the height of a magnetic head attached to the other side. A base of a magnetic head, characterized in that holes are provided extending from the one side to both sides of the contact position of the adjusting screw. 3. An H-shaped hole in a base of a magnetic head for fixing the height of a magnetic head attached to the other part by being fixed to the drum by a fixing screw at one part and pushing the other part by an adjusting screw. The base of the magnetic head is characterized in that a portion is formed and both side portions of the H-shape extend to both sides of the position of the fixing screw and both sides of the contact position of the adjusting screw.