JPH1153793A - Rotary magnetic head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high reliable rotary magnetic head by providing a surface closing a gap between a head fitting window provided on an outer peripheral part of a rotary head cylinder and a head chip on a head base. SOLUTION: A magnetic tape 6 travels while winding around the outer peripheral part of the rotary head cylinder 4. At this time, air pressure occurs between the magnetic tape 6 and the rotary head cylinder 4, and the magnetic tape 6 floats minutely for the rotary head cylinder 4. Since the gap between the head chip 2 and the head fitting window 5 is closed by the wall part 3a of the head base 3 in the radial direction of the rotary head cylinder 4, negative pressure occurring in the gap between a magnetic head and the head fitting window 5 is reduced remarkably. Thus, contact between the magnetic tape 6 and the rotary head cylinder 4 is evaded, and the failure such as clogging of a head and a traveling impediment, etc., due to sticking between the tape 6 and the cylinder 4 are prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary magnetic head which is effective when used in a video tape recorder, a digital audio tape recorder, and the like.

[0002]

2. Description of the Related Art A conventional rotary magnetic head will be described below.

FIG. 4 is a perspective view of a main part of a conventional rotary magnetic head, and FIG. 5 is a side view of the main part. In the figure, 21 is a head chip for recording and reproducing video and audio signals and the like by contacting a magnetic tape 26, 22 is a head base on which the head chip 21 is mounted, and 24 is a rotary head in which the head chip 21 and the head base 22 are mounted. Cylinder 25 is a head mounting window provided on the rotary head cylinder 24 and protruding from the tip of the head chip 21.
A fixed gap is provided between the head chip 22 and the head chip 22. The gap between the head mounting window 25 and the head chip 22 needs a certain size for the necessity of adjusting the position of the head and increasing the efficiency in manufacturing.

[0004] The operation of the conventional rotary magnetic head configured as described above will be described below.

The rotary head cylinder 24 is rotated at a high speed by a built-in motor (not shown), and the magnetic tape 26 runs while being wound around the rotating rotary head cylinder 24. When the rotary head cylinder 24 rotates at a high speed, air pressure is generated between the rotary head cylinder 24 and the magnetic tape 26, and the magnetic tape 26 runs slightly floating with respect to the rotary head cylinder 24. At this time, since a negative pressure is generated in the gap between the magnetic head 22 and the head mounting window 25, the rotary head cylinder 24 and the magnetic tape 2
6 may come into contact. Rotating head cylinder 24
And the magnetic tape 26 come into contact with each other, causing problems such as clogging of the head chip 21 and sticking between the magnetic tape 26 and the rotary head cylinder 24. Magnetic tape 2
In order to avoid contact between the rotary head cylinder 6 and the rotary head cylinder 24, the head mounting window 25 may be made small since the head chip 21 is protruded. It cannot be reduced for efficiency.

[0006]

However, in the above-mentioned conventional structure, the magnetic head and the head mounting window 25 are required for the reason of the necessity of adjusting the head position and the efficiency of manufacturing.
A constant gap must be provided between the rotating head cylinder 24 and the magnetic tape 26 because a negative pressure is generated in the gap. There is a possibility that a trouble such as a running obstacle due to sticking to the vehicle 24 may occur.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems. Since the contact between the rotary head cylinder and the magnetic tape can be avoided without reducing the size of the head mounting window, clogging of the head and rotation of the magnetic tape with the magnetic tape are prevented. It is an object of the present invention to provide a highly reliable rotating magnetic head that does not cause a trouble such as a running obstacle due to sticking to a head cylinder.

[0008]

In order to achieve this object, a rotary magnetic head according to the present invention comprises a head chip for recording and reproducing signals on and from a magnetic tape, a head base on which the head chip is mounted, and a head. A rotary magnetic head including a rotary head cylinder containing a chip and a head base, and a head mounting window provided on the rotary head cylinder and protruding the tip of the head chip, provided in the rotary head cylinder. And a wall portion substantially parallel to the inner wall of the rotary head cylinder and having an area larger than the head mounting window, and a head chip window provided on the wall portion and through which the tip of the head chip is inserted.

With such a configuration, contact between the rotary head cylinder and the magnetic tape can be avoided without reducing the size of the head mounting window. Therefore, head clogging and running due to sticking between the magnetic tape and the rotary head cylinder are achieved. A highly reliable rotating magnetic head free of troubles such as failures can be obtained.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a head chip for recording and reproducing signals on and from a magnetic tape, a head base on which the head chip is mounted, a head chip and a head base. A rotating head cylinder having a rotating head cylinder provided therein, and a head mounting window provided on the rotating head cylinder and provided with a tip of a head chip protruding therefrom, wherein the rotating head cylinder inner wall provided in the rotating head cylinder A wall having a larger area than the head mounting window and substantially parallel to the head mounting window, and a head chip window provided in the wall and through which the tip of the head chip is inserted, greatly reducing the negative pressure in the gap and rotating the magnetic tape. Because it can avoid contact with the head cylinder, clogging of the head and sticking between the magnetic tape and the rotating head cylinder It is possible to obtain high reliability such troubles such line failure does not occur.

Further, the invention according to claim 2 is characterized in that the wall portion is constituted by using a part of the head base, and can be realized without a significant increase in cost. .

Hereinafter, embodiments of the present invention will be described with reference to the drawings. (Embodiment 1) FIG. 1 is a plan view of a principal part showing a rotary magnetic head according to the present embodiment, and shows a vicinity of a magnetic head mounting portion on a bottom surface of a rotary head cylinder. FIG. 2 is a perspective view of the main part, and FIG. 3 is a side view of the main part. In the figure,
Reference numeral 2 denotes a head chip for recording and reproducing video and audio signals and the like in contact with the magnetic tape 6, and reference numeral 3 denotes a head base on which the head chip 2 is mounted. The head chip 2 and the head base 3 constitute a magnetic head. Reference numeral 3a denotes a part of the head base 3 which is parallel to the inner wall of the rotary head cylinder 4 and has a sufficiently larger area than the head mounting window 5. 3b is a head chip window provided on the wall 3a and through which the tip of the head chip 2 is inserted. 4 is a rotary head cylinder in which the head chip 2 and the head base 3 are housed. Has a constant gap with the head chip 2 and a constant gap between the wall 3a and the inner wall of the rotary head cylinder 4, so that the head position can be adjusted. is there. The gap between the head chip 2 and the head mounting window 5 is closed in the radial direction of the rotary head cylinder 4 by the wall 3a.

With reference to FIGS. 1 and 2, the operation of the rotating magnetic head according to the present embodiment having the above-described structure will be described.

The magnetic tape 6 runs while being wound around the outer periphery of the rotating head cylinder 4 which rotates at high speed. At this time,
Air pressure is generated between the magnetic tape 6 and the rotary head cylinder 4, and the magnetic tape 6 slightly floats with respect to the rotary head cylinder 4.

In FIG. 2, the gap between the head chip 2 and the head mounting window 5 is defined by the wall 3 of the head base 3.
Since a is closed in the radial direction of the rotary head cylinder 4, the negative pressure generated in the gap between the magnetic head and the head mounting window 5 can be significantly reduced.

As described above, according to the present embodiment, it is possible to avoid contact between the magnetic tape 6 and the rotary head cylinder 4 without reducing the size of the head mounting window 5, and to prevent clogging of the head and the magnetic tape 6. It is possible to prevent problems such as running obstacles due to sticking to the rotary head cylinder 4.

Further, since the wall 3a uses a part of the head base 3, the above effect can be realized without increasing the number of parts.

[0018]

As described above, the present invention provides a head base with a surface which closes a gap between a head mounting window provided on an outer peripheral portion of a rotary head cylinder and a head chip. Since the pressure can be greatly reduced, contact between the magnetic tape and the rotating head cylinder can be avoided without reducing the size of the head mounting window, and clogging of the head, running obstacles due to sticking of the magnetic tape to the rotating head cylinder, etc. It is possible to realize a highly reliable rotating magnetic head which does not cause any trouble.

[Brief description of the drawings]

FIG. 1 is a plan view of a main part of a rotary magnetic head according to an embodiment of the present invention.

FIG. 2 is a perspective view of a main part of the rotary magnetic head according to the embodiment of the present invention.

FIG. 3 is a side view of a main part of the rotary magnetic head according to the embodiment of the present invention;

FIG. 4 is a perspective view of a main part of a conventional rotary magnetic head.

FIG. 5 is a side view of a main part of a conventional rotary magnetic head.

[Explanation of symbols]

 2 Head Chip 3 Head Base 3a Wall 3b Head Chip Window 4 Rotating Head Cylinder 5 Head Mounting Window 6 Magnetic Tape

Claims (2)

[Claims] 1. A head chip for recording / reproducing a signal to / from a magnetic tape, a head base on which the head chip is mounted, a rotary head cylinder containing the head chip and the head base, and the rotary head A rotary magnetic head provided with a head mounting window provided in a cylinder to protrude the tip of the head chip, wherein the head mounting window is provided in the rotary head cylinder and substantially parallel to an inner wall of the rotary head cylinder. A rotating magnetic head comprising: a wall having an area larger than a window; and a head chip window provided on the wall and through which the tip of the head chip is inserted. 2. The rotating magnetic head according to claim 1, wherein the wall is formed by using a part of a head base.