JPH06274841A - Magnetic head device provided with cleaning mechanism - Google Patents

Abstract

PURPOSE:To properly reproduce a magnetic tape with simple constitution. CONSTITUTION:A cleaning member 31A is driven by the driving force of a driving member 50 before a magnetic head 20 is in contact with the magnetic tape, and the head surface of the magnetic head 20 is stroked by a brush 33. When the stroke of the head surface is ended, a hanging part 32 attaching the brush 33 of the cleaning member 31A is retreated to the retreat recessed part 15 of a head attaching base by the driving member 50. In such a state, the hanging part 32 is placed in the inside from the head surface of the magnetic head 20. Then, since no hanging part 32 of the cleaning member 31A is in contact with a magnetic tape at a tape running time, the damaging to the magnetic tape and the occurrence of wow, flutter due to friction are prevented also. When a magnetic shield member is disposed on the head surface of the magnetic head 20, the insertion of the magnetic head 20 to a tape running window is attained since only the thickness of the magnetic shield member is increased on the head surface of the magnetic head 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head device provided with a cleaning mechanism for automatically cleaning foreign matter such as magnetic powder adhered to the contact surface of a magnetic head that contacts a magnetic tape.

[0002]

2. Description of the Related Art When the reproducing operation of a magnetic tape is repeated for a long period of time, foreign matter such as magnetic powder adheres to the head surface of the magnetic head. In this way, when foreign matter such as magnetic powder adheres to the head surface, the sensitivity of the magnetic head is reduced, which causes deterioration in the sound quality of the reproduced sound.
Therefore, in order to keep the head surface of the magnetic head always clean, it is necessary to perform regular cleaning using a cleaning tape, a dedicated cleaning brush, or the like.

However, such a cleaning operation of the magnetic head is apt to be forgotten, so that, for example, in Japanese Utility Model Publication No. 51-191985, the magnetic head is utilized by driving the main body of the apparatus or loading the recording medium. Techniques for automatically cleaning the have been proposed. That is, the angle is rocked by using the loading operation of the magazine as a drive source, and the head cleaning material attached to one end of this angle is rubbed against the head surface of the magnetic head.

Incidentally, a mechanism for cleaning the head surface of a magnetic head by means of a cleaning member attached to an arm that swings when the magazine is loaded is described in Japanese Utility Model Publication 48-21608.
And Japanese Utility Model Publication No. 51-7087.

However, in such a cleaning mechanism, since a cleaning member such as a felt or a brush is pressed against the head surface of the magnetic head in order to remove foreign matter adhering to the magnetic head, cleaning of the magnetic head is performed. Due to the pressing force of the member, the positional relationship of the magnetic head is likely to be distorted. When the magnetic head is misaligned, the magnetic tape cannot be run at a proper position with respect to the magnetic gap, and reproduction of information recorded on the magnetic tape becomes inappropriate, resulting in deterioration of sound quality. . By the way, in the case of a video tape, the image quality is deteriorated.

Further, when the magnetic head is displaced, the angle of the head gap with respect to the magnetic tape is displaced, so it is necessary to correct the displacement of the magnetic head.

In order to solve such a problem, the applicant of the present application has proposed, as Japanese Patent Application No. 3-254440, a magnetic head device in which the positional deviation of the magnetic head and the gap angle are prevented. ing.

That is, as shown in FIGS. 1 and 2, at both ends of the head mount 10, tape guides 11 having guide protrusions 11a are provided in a protruding manner. Inside the tape guides 11, a head guide 12 is provided so as to project in the same direction as the tape guide 11. Each tape guide 11 and head guide 12 is formed with a guide recess slightly wider than the width of the magnetic tape 42 accommodated in the cassette half 40. Magnetic tape 42
Are guided by these guide recesses so that stable traveling is performed.

A magnetic head 20 is fixed to a head mounting portion 13 formed by each head guide 12. Recesses 22 and 23 are provided on both sides of the magnetic gap 21 of the magnetic head 20. In addition, the magnetic gap 21
Brush housing recesses 24, 25 are formed on the outermost side of the. A shield plate 26 made of permalloy or the like is inserted inside the magnetic head 20 to prevent an adverse effect caused by an external magnetic field entering the inside of the magnetic head 20.

A shaft 30 is attached to a support member 34 provided on the back side of the magnetic head 20. A lever 31 of a cleaning member 31A is rotatably attached to the shaft 30 via a shaft 30A. A contact piece 35 is provided on one end of the lever 31.
A hanging portion 32 is provided on the other end side of the lever 31. A brush 33 that contacts the head surface of the magnetic head 20 is planted inside the hanging portion 32. This brush 3
3 is made of, for example, nylon fiber or carbon fiber.

In the magnetic head device having such a configuration, as shown in FIG. 3, the drive member 50 moves in the direction of the arrow every time the direction change operation is performed, and the projections 51, 52 provided on the drive member 50. Presses the contact piece portion 35. As a result, the brush 33 provided on the hanging portion 32 by rotating the lever 31 within the range of θ1.
Rubs the head surface of the magnetic head 20 to remove foreign matter such as magnetic powder adhering to the head surface. In addition, for example, during reproduction of the magnetic tape 42, the lever 31 rotates to the left or right, and is positioned on the side of either one of the head guides 12 and stands by.

In this way, the magnetic head 20 is cleaned every time the direction change operation is performed, and the magnetic particles and the like adhering to the head surface of the magnetic head 20 are removed, so that the magnetic tape 42 is properly reproduced.

Further, the magnetic head 20 and the tape guide 1
The cleaning member 3 is attached to the head mounting base 10 in which 1 is integrated.
Since 1A is rotatably mounted, even if the head mounting base 10 is slightly displaced on the mechanical chassis due to the impact when the lever 31 is rotated, the relative distance between the tape guide 11 and the magnetic head 20 is increased. Since the positional relationship does not change at all, the positional relationship between the magnetic gap and the magnetic tape 42 is always maintained appropriately, and a good reproducing operation can be performed.

[0014]

As described above, in the magnetic head device having the above-mentioned conventional cleaning mechanism,
As shown in FIG. 3, the lever 31 is attached to each head guide 12
The magnetic tape 42 is rotated within a range of θ1 between
During reproduction, the hanging part 32 is on standby at one of the head guides 12 side.

However, in this state, the cleaning member 31A
Since the hanging portion 32 of the magnetic head 20 is located at substantially the same position as the head surface of the magnetic head 20 or at a position slightly protruding from the head surface, the running magnetic tape 42 comes into contact with the back surface side of the hanging portion 32. In this way, the running magnetic tape 42 is
If the magnetic tape 42 comes into contact with the back side of the magnetic tape 42, the magnetic tape 42 may be scratched, or the running of the magnetic tape 42 may become unstable due to friction with the hanging portion 32, causing wow and flutter.

When the magnetic tape 42 is reproduced, as shown in FIG. 4, the magnetic head 20 is fitted into the tape running window 41 of the cassette half 40, so that the magnetic gap of the magnetic head 20 is changed. It abuts 42. Therefore, when the magnetic shield member is to be arranged on the head surface of the magnetic head 20, the hanging portion 3 of the cleaning member 31A depends on the thickness of the magnetic shield member.
The position 2 further projects from the head surface of the magnetic head 20. In such a case, since the insertion depth of the tape running window 41 of the cassette half 40 is limited, it is difficult to dispose the magnetic shield member on the head surface.

The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a magnetic head device having a cleaning mechanism having a simple structure and capable of appropriately reproducing a magnetic tape. To aim.

[0018]

In order to achieve the above-mentioned object, a magnetic head device equipped with a cleaning mechanism of the present invention has a magnetic head for recording / reproducing information on / from a magnetic tape and a magnetic head mounted on the magnetic head. A head mount having a mounting part to be fixed and a tape guide part of the magnetic tape;
A cleaning member for rubbing the head surface of the magnetic head, a retracting portion provided at a position off the magnetic head mounting portion of the head mounting base for retracting the cleaning member when the tape is running, and the cleaning member. And a drive unit for causing the cleaning member to retract to the retracting portion when the tape is running.

[0019]

In the magnetic head device provided with the cleaning mechanism of the present invention, the cleaning member is driven by the driving force of the driving means before the running of the magnetic tape, that is, before the magnetic head contacts the magnetic tape, The head surface of the magnetic head is rubbed. When the rubbing of the head surface is completed, the drive means retracts the cleaning member to the retracting portion provided on the head mount. In this state, since the cleaning member is located inside the head surface of the magnetic head, the cleaning member does not come into contact with the magnetic tape when the tape is running.

Therefore, since there is no contact between the magnetic tape and the cleaning member when the tape is running, the magnetic tape may be scratched or the running of the magnetic tape may become unstable due to friction, causing wow and flutter. There is no risk of getting stuck.

Further, when the cleaning member is retracted to the retracting portion, the cleaning member is located inside the head surface of the magnetic head, so that the magnetic shield member is disposed on the head surface of the magnetic head. However, since only the thickness of the magnetic shield member is increased on the head surface of the magnetic head,
The magnetic head can be inserted into the tape running window of the cassette half where the insertion depth is limited.

[0022]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the drawings described below, the same parts as those in FIGS. 1 to 4 are designated by the same reference numerals, and a duplicate description will be omitted.

5 to 7 show an embodiment of a magnetic head device equipped with the cleaning mechanism of the present invention. As shown in these drawings, the tape guide 11 having guide protrusions 11a at both ends of the head mount 10 is provided.
Is projected. Inside the tape guides 11, a head guide 12 is provided so as to project in the same direction as the tape guide 11. However, in the present embodiment, unlike the conventional one shown in FIG. 1, one head guide 12
Is omitted. The recess on the side of the tape guide 11 where the head guide 12 is not provided is a cleaning member 31 described later.
It is the recessed recess 15 of the hanging portion 32 to which the A brush 33 is attached.

A magnetic head 20 is fixed to the head mounting portion 13. As shown in FIG. 2, the magnetic head 20 is provided with recesses 22 and 23 on both sides of the magnetic gap 21. However, in this embodiment, unlike the conventional case, the retracting portion of the hanging portion 32 is the retracting recess 15 which is a position off the head surface of the magnetic head 20. The recesses 24 and 25 are unnecessary.

A shaft 30 is attached to a support member 34 provided on the back side of the magnetic head 20. A lever 31 of a cleaning member 31A is rotatably attached to the shaft 30 via a shaft 30A. A contact piece 35 is provided on one end of the lever 31.
A pin 36 is attached to the lower surface side of the contact piece portion 35. A hanging portion 32 is provided on the other end side of the lever 31. Inside the hanging portion 32, a brush 33 made of nylon fiber or carbon fiber, which comes into contact with the head surface of the magnetic head 20, is planted.

In the vicinity of the support member 34, a drive member 50 that moves in the directions of arrows a and b each time a cleaning operation is performed is provided. The drive member 50 is provided with an engagement recess 53 for engaging the pin 36, and the drive member 50 is provided with the engagement recess 53.
The slanted sides 54 and 55 of the engaging recess 53 press the pin 36 in the direction of arrow a or b in accordance with the movement in the direction of arrow a or b. This causes the lever 31 of the cleaning member 31A to rotate via the shaft 30A. In this embodiment, the case where the lever 31 of the cleaning member 31A is rotated by the drive member 50 that moves in the directions of the arrows a and b is shown, but the present invention is not limited to this example, and the pin 36 is formed by a rotary cam, for example. The cleaning member 3
You may make it rotate the lever 31 of 1A.

Next, the operation of the magnetic head device having such a structure will be described. First, when performing the cleaning operation, the drive member 50 moves in the direction of arrow a. As a result, the engagement recess 53 of the drive member 50 shifts in the same direction, and the inclined side 54 of the engagement recess 53 presses the pin 36 in the same direction. When the pin 36 is displaced in the same direction by pressing the inclined side 54, the lever 31 of the cleaning member 31A rotates within the range of θ2 via the shaft 30A. When the hanging portion 32 rotates counterclockwise by the rotation of the lever 31, the hanging portion 32
A brush 33 provided on the inner side of the head rubs the head surface of the magnetic head 20.

When the hanging portion 32 comes into contact with the head guide 12 by the rotation of the lever 31, the movement of the drive member 50 in the direction of arrow a is stopped, and then the movement in the direction of arrow b is started. When the engaging recess 53 is displaced in the same direction by the movement of the driving member 50 in the direction of the arrow b, the inclined side 55 of the engaging recess 53 presses the pin 36 in the same direction. When the pin 36 is displaced in the same direction by pressing the inclined side 55, the lever 31 of the cleaning member 31A rotates via the shaft 30A.
When the hanging part 32 is rotated clockwise by the rotation of the lever 31, the brush 33 provided inside the hanging part 32 is rotated.
Rubs the head surface of the magnetic head 20.

When the brush 33 rubs against the head surface of the magnetic head 20 once, for example, a single reciprocal movement causes the lever 31 to rotate in the clockwise direction so that the hanging portion 32 is located at a position away from the head surface of the magnetic head 20. Move to side 15.

When the movement of the hanging portion 32 to the retracting recess 15 is completed, the magnetic head 20 is fitted into the tape running window 41 of the cassette half 40 by the movement of the head mount 10 and the supporting member 34, as shown in FIG. Put in. As a result, the magnetic gap of the magnetic head 20 comes into contact with the magnetic tape 42, so that the magnetic tape 42 is reproduced, for example.

In this state, the hanging part 3 of the cleaning member 31A is
Since 2 is located inside the head surface of the magnetic head 20, even if the magnetic tape 42 is in sliding contact with the head surface of the magnetic head 20, its hanging portion 32 contacts the magnetic tape 42. Therefore, the magnetic tape 42 travels in a stable state.

In this state, even when the magnetic shield member is provided on the head surface of the magnetic head 20,
Since only the thickness of the magnetic shield member is increased on the head surface of the magnetic head 20, the magnetic head 20 can be inserted into the tape running window 41 of the cassette half 40 having a limited insertion depth.

As described above, in this embodiment, the magnetic tape 4 is used.
2 is started, that is, before the magnetic head 20 contacts the magnetic tape 42, the cleaning member 31A is driven by the driving force of the driving member 50, and the head surface of the magnetic head 20 is rubbed by the brush 33. It When the rubbing of the head surface is completed, the driving member 50 moves to the head mount 10.
The hanging portion 32, to which the brush 33 of the cleaning member 31A is attached, is retracted into the retracting recess 15 provided in the. In this state, since the hanging part 32 is located inside the head surface of the magnetic head 20, the hanging part 32 of the cleaning member 31A does not contact the magnetic tape 42 when the tape is running.

Therefore, since there is no contact between the magnetic tape 42 and the hanging portion 32 of the cleaning member 31A when the tape is running, the magnetic tape 42 may be scratched,
The friction makes the running of the magnetic tape 42 unstable and eliminates the possibility of wow and flutter.

When the hanging portion 32 of the cleaning member 31A is retracted into the retracting recess 15, the cleaning member 31A is located inside the head surface of the magnetic head 20, so that the head surface of the magnetic head 20 has a magnetic shield. Even if a member is provided, only the thickness of the magnetic shield member is increased on the head surface of the magnetic head 20, so that the tape running window 41 of the cassette half 40 having a limited insertion depth.
It is possible to insert the magnetic head 20 into the.

[0036]

As described above, according to the magnetic head device having the cleaning mechanism of the present invention, after the rubbing operation of the head surface of the magnetic head is completed, the cleaning member is retracted to the retracting portion. I chose

Therefore, since there is no contact between the magnetic tape and the cleaning member when the tape is running, the magnetic tape is scratched, or the running of the magnetic tape becomes unstable due to friction, which causes wow and flutter. There is no risk of getting stuck.

Further, when the cleaning member is retracted to the retracting portion, the cleaning member is located inside the head surface of the magnetic head, so that the magnetic shield member is disposed on the head surface of the magnetic head. However, since only the thickness of the magnetic shield member is increased on the head surface of the magnetic head,
The magnetic head can be inserted into the tape running window of the cassette half where the insertion depth is limited. As a result, it is possible to properly reproduce the magnetic tape with a simple configuration.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a magnetic head device having a conventional cleaning mechanism.

FIG. 2 is a perspective view showing the magnetic head of FIG.

3 is a plan view showing the cleaning mechanism of FIG. 1. FIG.

FIG. 4 is a cross-sectional view showing a state in which the magnetic head of FIG. 1 is inserted into a tape running window of a cassette half.

FIG. 5 is a plan view showing an embodiment of a magnetic head device having a cleaning mechanism of the present invention.

FIG. 6 is a cross-sectional view showing a state in which the magnetic head of FIG. 5 is inserted into a tape running window of a cassette half.

FIG. 7 is a diagram for explaining the operation of the magnetic head device including the cleaning mechanism of FIG.

[Explanation of symbols]

 10 Head Mounting Base 11 Tape Guide 12 Head Guide 13 Head Mounting Section 15 Evacuation Recess 20 Magnetic Head 31 Lever 31A Cleaning Member 32 Hanging Part 33 Brush 50 Drive Member 53 Engagement Recess

Claims (1)

[Claims] 1. A magnetic head for recording and reproducing information on and from a magnetic tape, a mounting portion for mounting and fixing the magnetic head, and a head mount having a tape guide portion for the magnetic tape, and a head for the magnetic head. A cleaning member for rubbing the surface; a retracting portion provided at a position of the head mount, which is separated from the mounting portion of the magnetic head, for retracting the cleaning member when the tape is running; A magnetic head device provided with a cleaning mechanism, which is provided with a drive means for performing an operation and for retracting the cleaning member to the retracting portion when the tape is running.