JP2707009B2 - Magnetic head device with cleaning mechanism - Google Patents

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 incorporated in a tape recorder or the like and having a mechanism for automatically cleaning.

[0002]

2. Description of the Related Art If foreign matter such as dust or magnetic powder adheres to the front surface of a magnetic head, not only the sensitivity of the head is reduced but also the life is shortened. Therefore, in order to keep the front of the magnetic head clean at all times, wrap a cloth or the like around the fingertip to wipe off foreign substances, or periodically clean the front of the magnetic head using a cleaning tape or a special cleaning brush. ing.

It is also known that a cleaning mechanism is incorporated in the magnetic head itself, and the magnetic head is automatically cleaned by using a drive of a device main body or a magazine loading operation. For example, in Japanese Utility Model Publication No. 51-19855, cleaning is performed by rubbing a front surface of a magnetic head with a head cleaning material attached to one end of an oscillating angle using a magazine loading operation as a driving source.

A mechanism for cleaning the front surface of a magnetic head with a cleaning member attached to an arm that swings by a loading operation of a magazine is introduced in Japanese Utility Model Publication No. 48-21608. The present applicant also attaches a felt, a brush, or the like to the other end of the crank lever having one end connected to the pressing rod, and moves the pressing rod to rub the felt, brush, or the like against the front surface of the magnetic head. Was introduced in Japanese Utility Model Publication No. 51-7087.

[0005]

A cleaning member such as a felt or a brush is pressed against the front surface of the magnetic head in order to remove foreign substances adhering to the magnetic head. At this time, the positional relationship of the magnetic head is likely to be out of order due to the pressing force of the cleaning member against the magnetic head. If the magnetic head is displaced, the magnetic tape cannot run at a regular position with respect to the magnetic gap. As a result, it is difficult to correctly reproduce the information recorded on the magnetic tape, which causes sound quality deterioration, image deterioration, and the like.

[0006] When a displacement of the head core, a gap angle, or the like with respect to the running of the tape occurs, azimuth adjustment for correcting the head core, the magnetic gap, or the like with high accuracy is required. Azimuth adjustment is performed by a special operation using high-precision equipment, and cannot be easily performed by a normal user.

Therefore, even in a magnetic head having a mechanism for automatically cleaning the entire surface of the head, it is required that the magnetic head does not shift during use.

The present invention has been devised in order to meet such a demand, and a tape guide portion is provided with a brush in a magnetic head device integrated with a head mounting base, thereby making it possible to prevent tape running. It is an object of the present invention to provide a magnetic head device capable of always performing high-quality reproduction in a stable state without causing a head core position shift, a gap angle shift, and the like.

[0009]

In order to achieve the object, a magnetic head device according to the present invention has a head mounting space integrally provided with a head mounting space to which a magnetic head is fixed and a tape guide portion for regulating the running of the tape. A base, a lever pivotally supported at the rear of the upper surface of the head mounting base, a cleaning member implanted inside the bent front end of the lever, and a lever engaged with the rear end of the lever. A drive member for rotating a lever, wherein the cleaning member rubs the front surface of the magnetic head.

Here, since the lever is turned in the left-right direction, power can be transmitted from the tape drive system to drive the drive member. Alternatively, it is also possible to adopt a method in which a predetermined cleaning button is further provided on the front panel, and the driving member is driven by pressing the cleaning button. As the cleaning member, a brush, felt, or the like can be used.

[0011]

In the magnetic head device of the present invention, a rotary shaft of a lever having a cleaning member such as a brush is mounted on a base in which a head mounting base and a tape guide are integrated. Thus, even if the positional relationship of the head mounting table with respect to the device main body is shifted due to the rubbing of the cleaning member, the tape guide is also shifted according to the shift, so that the gap between the magnetic head and the tape guide is generated. No relative displacement occurs. Therefore, the head core and the gap angle for the tape running are always maintained as originally designed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. In the following embodiment, the case where an audio tape is used is described, but the present invention is not limited to this. Magazine tape,
As long as the magnetic head is used for reproducing information recorded on a magnetic tape such as a video tape, the present invention is of course similarly applicable.

As shown in FIG. 1, the magnetic head device of this embodiment has a head mounting space 30 on which the magnetic head 10 is mounted and a tape guide portion 20 integrally formed.
It has. A lever 40 having a cleaning brush is attached to the head mount 30 by a pivot 41.
It is attached so that it can turn around the center.

The magnetic head 10 is provided with depressions 12 and 13 on both sides of a magnetic gap 11 as shown in FIG. Further, brush receiving recesses 16 and 17 are formed on the outermost side. A shield plate 18 made of Permalloy or the like is placed inside the magnetic head 10, and disturbance is caused by the magnetic head 1.
0 is prevented from entering. Shield plate 1
Reference numeral 8 can also be used as a member constituting the bottom surface of the brush receiving recesses 16 and 17. On the back side of the magnetic head 10, a lead 19 (see FIG. 1) for supplying or taking out a drive current, an excitation current, a signal current or the like is attached.

The head mount 30 to which the magnetic head 10 is fixed is a resin molded body extending to the left and right sides around a head mounting space 31 in which the magnetic head 10 is mounted as shown in FIG. On both sides of the head mounting space 31, head guides 32, 32 project forward, and serve as guides when the magnetic head 10 is inserted and fixed in the head mounting space 31. In addition, a reinforcing portion 33 is provided above the head mounting space 31.
To prevent the head mounting space 31 from opening in the left-right direction due to heat, stress, or the like.

A mounting seat 34 extends rearward below the head mounting base 30. On the lower surface of the mounting seat 34, a positioning projection 35 inserted into a hole of the chassis or the like is formed to secure the positional relationship of the head mounting base 30 with respect to the chassis or the like. Then, the positioning projection 35
The mounting holes 36 are located on both sides of the mounting seat 34.
Penetrates. The center of the rear portion of the mounting seat 34 is a stepped portion 37 with a higher step, and a through hole 38 is provided in the stepped portion 37 to which a shaft 42 for pivotally supporting the lever 40 is fixed.

The tape guide section 20 integrally formed on the left and right sides of the head mounting base 30 has bent portions 21 and 22 bent forward from the head mounting base 30. During tape reproduction, the bent portions 21 and 22 are inserted into the small windows of the cassette half as shown by the dotted lines in FIG. Bending part 2
Upper and lower protrusions 21b and 22b and lower protrusions 21c and 22c are provided on the first and second grooves 22 and 21 with grooves 21a and 22a having a width corresponding to the width of the magnetic tape. The running magnetic tape is composed of these projections 21b, 21c and 22b, 2
It is guided by 2c and passes through the magnetic head in a predetermined positional relationship.

To ensure the positional relationship between the magnetic tape and the magnetic head 10, a similar groove 32 is formed in the head guide 32.
The upper protrusion 32b and the lower protrusion 32c sandwiching a may be formed. At this time, it is important to provide linearity between the head guides 32, 32 and the tape guide section 20 in order to achieve stable running of the tape.

At the upper end of the shaft 42 fixed in the through hole 38 formed in the step portion 37, as shown in FIG.
One end of an inverted L-shaped lever 40 composed of 0h and a hanging part 40v is pivotally supported by screws 46 together with washers 43 and 44, a spring 45 and a collar 48. At the pivot end of the lever 40, both sides are raised and the ribs 40a,
The cutouts 40c and 40d are formed in the respective 40a and 40b so that the ends of the springs 45 are inserted therethrough.

The opposite side of the lever 40 is a hanging part 40v which is bent and extends vertically downward. Hanging part 40
In v, a brush 47 is provided. The brush 47 is
For example, it can be provided by caulking the hanging portion 40v with brush hairs of nylon fiber, carbon fiber, etc. wound around a mandrel. Carbon fiber brush 47
When using, antistatic is also achieved. In the mounted state, the lever 40 extends forward from the gap between the upper surface of the magnetic head 10 and the reinforcing portion 33 as shown in FIG. 1, and the brush 47 touches the front surface of the magnetic head 10.

The lever 40 is preferably made of a non-magnetic material such as austenitic stainless steel so as not to adversely affect the magnetic head 10. Also,
In order to discharge the static electricity accumulated in the lever 40, the shaft 42, washers 43, 44, screws 46 and the like are made of copper having excellent conductivity, and an earth plate 49 attached to the lower portion of the shaft 42 is fixed to the chassis with screws 49a. ing. As a result, the lever 40 is fixed to the support 42, the ground plate 49 and the screw 4.
Electrical contact with the chassis via 9a.

The spring 45 is formed in a substantially U-shape, and has a distal end portion 4 whose both ends are bent in a direction away from each other.
5a and 45b. These tip portions 45a, 45
b denotes notches 40c, 40c formed in the ribs 40a, 40b of the lever 40 in a state where the U-shape of the spring 45 is compressed.
Each of the ribs 40a and 40b protrudes slightly laterally from the ribs 40a and 40b. Then, the center part 45c is colored 4
8 together with washers 43 and 44, and are integrated with lever 40 by screws 46.

A rib 40 formed at the rear end of the lever 40
a and 40b function as a stopper for fixedly supporting the intermediate portion of the spring 45, and also as an action portion against which the driving member 50 is pressed. The drive member 50 receives power from a drive source such as a tape drive motor (not shown),
It reciprocates periodically or as needed along the direction of the arrow in FIG.
Further, the force for moving the driving member 50 can be obtained by operating a push button provided on the front panel of the tape deck main body.

The drive member 50 has raised portions 51 and 52 formed near both ends on the upper surface in the direction D ₁ -D ₂ .
D ₁ direction or D by the movement of the _two directions of the drive member 50, the rib 4 of the lever 40 at the side surface of the raised portion 51 or 52
A pressing force is applied to 0a or 40b, and the lever 40 pivots clockwise or counterclockwise around the pivot.

At this time, the tip portions 45a, 45b of the spring 45 projecting from the side surfaces of the ribs 40a, 40b first come into contact with the side surfaces of the raised portions 51, 52. The pressing force of the driving member 50 is absorbed as elastic deformation of the spring 45. Thereafter, the raised portions 51 and 52 are
a, 40b, and the lever 40 starts rotating. That is, when the lever 40 starts turning, the spring 45 acts as a cushioning material to prevent a sudden force from being applied to the lever 40, and the magnetic head 10 and the head guide 3
2 is achieved.

FIG. 6 is a top view showing the entirety in which the lever 40 is pivotally supported on the head mount 30 on which the above-described magnetic head 10 is mounted, and the driving member 50 is disposed at the rear end of the lever 40. FIG. 7 is a side view showing the whole. The lever 40 has a hanging portion 40v extending vertically downward from a horizontal portion 40h extending forward from between the reinforcing portion 33 and the upper surface of the magnetic head 10, and a brush 47 implanted on the inner surface of the hanging portion 40v has a magnetic force. It is in contact with the front surface of the head 10. Here, the length from the pivot 41 to the tip of the horizontal portion 40h is determined so that the curvature of the arc drawn by the tip of the horizontal portion 40h corresponds to the curvature of the front surface of the magnetic head 10.

The driving member 50 has an integrated power transmission section 51. The driving member 50 moves left and right by the power transmitted to the power transmission unit 51 via a motor, a gear, and the like. Thereby, the driving member 50 also moves in the same direction.

Next, the cleaning operation of the magnetic head device described above will be described. For example, when performing head cleaning by rotating the lever every time the direction change operation is performed, the lever 40 rotates in the process illustrated in FIG.

First, when the reproduction is performed while the magnetic tape is running in the direction of the arrow in FIG. 8A, the lever 40 is turned leftward, and the hanging part 40v of the lever 40 contacts the left head guide 32d. The brush 47 is housed in the brush housing recess 16 on the left side. And the magnetic head 1
0 is fed out in the direction of a cassette half (not shown), and the magnetic tape contacts the entire surface of the magnetic head 10.

When the operation shifts from the reproducing state to the direction change operation, first, the driving member 50 moves to the left as shown in FIG. fall back. The movement of the driving member 50 and the cassette half continues until the rear end portion of the lever 40 comes into contact with the other raised portion 51 as shown in FIG. This time coincides with the timing at which the magnetic head retreats with respect to the cassette half loaded on the deck.

In the state shown in FIG. 8C, the magnetic head 10 is at the retracted position. However, the driving member 50 continues to move leftward. And the lever 40 is
Of the pivot portion 4 as shown in FIG.
The lever 40 is turned counterclockwise around the center 1.
By the rotation of the lever 40, the brush 47 implanted inside the hanging portion 40v moves rightward while rubbing against the front surface of the magnetic head 10 as shown in (4) to (5) of FIG. I do. As a result, foreign substances such as magnetic particles, dust, oil and the like adhering to the front surface of the magnetic head 10 are removed.

The turning of the lever 40 continues until the hanging portion 40v comes into contact with the other head guide 32e. At this time,
With the buffering action of the spring 45, the head guide 32e
Is reduced. The brush 47 implanted inside the hanging portion 40v is provided in the brush receiving recess 17 provided on the front right side of the magnetic head 10.
To be housed. Then, in order to perform reproduction in the reverse direction, the magnetic head 10 is extended, and the magnetic tape is caused to run in the direction of the arrow shown in FIG.

Since the magnetic head 10 is cleaned every time the direction change operation is performed, the magnetic head 10 in a clean state always comes into contact with the magnetic tape, and high-quality reproduction can be performed. For example, when normal tape running was performed with the magnetic powder adhered to the front surface of the magnetic head with oil, no head output was obtained due to the effect of the attached magnetic powder. On the other hand, lever 40
When the magnetic head 10 was cleaned by rotating the magnetic head 10 times, the output was recovered by 80%. Further, when the cleaning was repeated 10 times, the head output recovered 100% to the initial state.

[0034] Even after repeated cleaning, no decrease was observed in the reproduction output at high frequencies. This indicates that even if a slight change occurs in the positional relationship of the head mount 30 with respect to the equipment body such as the chassis, the contact state between the running magnetic tape and the front surface of the magnetic head 10 is not adversely affected at all. It is. That is, the tape guide 20 that regulates the running of the magnetic tape guided to the front surface of the magnetic head 10 is integrated with the magnetic head 10 into the head mount 30, and the relative positional relationship between the tape guide 20 and the magnetic head 10. And the magnetic tape is guided to the front surface of the magnetic head 10 in a constant state.

As a drive source for moving the drive member 50 in the frontage direction of the magnetic head 10, a motor for running a magnetic tape can be used. However, the present invention is not limited to this, and other driving sources can be used. For example, in a deck body having a motor drive type loading mechanism, a loading motor can be used as a drive source. Alternatively, in a deck of the auto-reverse type, a mechanism for moving the drive member 50 with switching of the tape running direction can be incorporated. Further, in order to enable manual operation, a front panel having a cleaning push button may be attached to the deck.

[0036]

As described above, according to the present invention, a lever having a cleaning member is rotatably incorporated in a head mounting base in which a magnetic head and a tape guide are integrated, and the cleaning member is used to rotate the magnetic head. Cleaning is performed by rubbing the front surface. Therefore, even if a slight displacement occurs between the head mounting base and the device main body due to the impact at the time of lever rotation, the relative positional relationship between the tape guide and the magnetic head does not change at all.
As a result, the magnetic tape is always guided to the gap of the magnetic head in a normal state, and high quality reproduction is performed.

[Brief description of the drawings]

FIG. 1 is a perspective view of a magnetic head device according to an embodiment of the present invention.

FIG. 2 is a perspective view of a magnetic head mounted on a head mount.

FIG. 3 is a perspective view of a head mounting base.

FIG. 4 is an exploded perspective view showing a cleaning lever and a mounting portion thereof.

FIG. 5 is a perspective view showing a relationship between a lever and a driving member.

FIG. 6 is a top view of a head mounting base on which a magnetic head and a lever are assembled.

FIG. 7 is a side view of the head mount.

FIG. 8 is a process chart for sequentially explaining the driving of the lever.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Magnetic head 20 Tape guide part 30
Head mounting base 31 Head mounting space 40 Lever 47
Brush (cleaning member) 50 Drive member

Claims (2)

(57) [Claims] 1. A head mounting base integrally provided with a head mounting space to which a magnetic head is fixed and a tape guide for restricting the running of a tape, and a lever pivotally supported by a rear part of an upper surface of the head mounting base. A cleaning member implanted inside the bent front end of the lever, and a driving member that engages with the rear end of the lever to turn the lever, wherein the cleaning member is a magnetic head. A magnetic head device provided with a cleaning mechanism, which rubs the front surface of the magnetic head. 2. A magnetic head device having a cleaning mechanism, wherein the drive member according to claim 1 turns a lever in a left-right direction by power transmitted from a tape running system.