JPH0567318A - Magnetic head device with cleaning mechanism - Google Patents

Abstract

PURPOSE:To eliminate a relative misalignment of a tape guide and a magnetic head, to always maintain the clean state of the front of the magnetic head, and to execute reproduction of a good quality in the magnetic head device in which a cleaning mechanism is built. CONSTITUTION:On a head fitting base 30 on which a magnetic head 10 and a tape guide 20 are formed integrally, a lever 40 with a cleaning member such as a brush, etc., flocked is supported pivotally and turnably. The lever 40 is turned clockwise or counterclockwise by a suitable driving source, and eliminate magnetic powder and dust, etc., sticking on the front surface of the magnetic head 10 by the cleaning member provided in the inside of a suspending part 40v being in the front. Since the lever 40 is provided on the head fitting base 30, a relative positional deviation is not generated between the tape guide 20 and the magnetic head 10, and a magnetic tape is always guided to a magnetic gap in a normal state. Also, a relative position relation between the lever 40 and the head 10 can be stabilized, and a stain preventing effect is satisfactorily obtained.

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 provided with a mechanism for automatically cleaning.

[0002]

2. Description of the Related Art When 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 lowered but also the life is shortened. Therefore, in order to keep the front surface of the magnetic head clean at all times, wrap a cloth etc. around the fingertips to wipe away foreign matter, or clean the front surface of the magnetic head regularly with a cleaning tape or a dedicated cleaning brush. ing.

It is also known to incorporate a cleaning mechanism in the magnetic head itself to automatically clean the magnetic head by using the drive of the apparatus body or the magazine loading operation. For example, in Japanese Utility Model Publication No. 51-19855, cleaning is performed by rubbing a head cleaning material attached to one end of an angle swinging with a magazine loading operation as a drive source on the front surface of a magnetic head.

A mechanism for cleaning the front surface of the magnetic head with a cleaning member attached to an arm swinging by the magazine loading operation 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, one end of which is 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 matter adhering to the magnetic head. Due to the pressing force of the cleaning member on the magnetic head at this time, the positional relationship of the magnetic head is likely to be distorted. If the magnetic head is misaligned, the magnetic tape cannot be run at a proper position with respect to the magnetic gap. As a result, it becomes difficult to correctly reproduce the information recorded on the magnetic tape, which causes sound quality deterioration, image deterioration, and the like.

When the head core is displaced or the gap angle is displaced with respect to the running of the tape, azimuth adjustment for correcting the head core, the magnetic gap and the like with high accuracy is required. Azimuth adjustment is performed by a special work using a highly accurate device, 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 to prevent the magnetic head from being displaced during use.

The present invention has been devised in order to meet such a demand, and by incorporating a brush in a magnetic head device in which a tape guide portion is integrated with a head mounting base, it is possible to prevent the tape from running. An object of the present invention is to provide a magnetic head device that can always perform high-quality reproduction in a stable state without causing a positional deviation of the head core, a gap angle deviation, and the like.

[0009]

In order to achieve the object, a magnetic head device of the present invention has a head mounting space in which the magnetic head is fixed and a tape guide portion for integrally controlling a tape running, which is mounted on a head. A base, a lever pivotably supported on the rear of the upper surface of the head mounting base, a cleaning member planted inside the bent tip of the lever, and a lever that engages with the rear end of the lever. A drive member for rotating the lever, and the cleaning member slides on the front surface of the magnetic head.

Here, since the lever is pivoted 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 system in which a predetermined cleaning button is further provided on the front panel and the drive member is driven by pressing this cleaning button. A brush, felt, or the like can be used as the cleaning member.

[0011]

[Operation] In the magnetic head device of the present invention, a rotary shaft of a lever having a cleaning member such as a brush is attached to a base in which a head mount and a tape guide are integrated. As a result, even if the positional relationship of the head mounting base with respect to the device main body is displaced due to the rubbing of the cleaning member, the tape guide is also displaced according to the displacement, so that the gap between the magnetic head and the tape guide. No relative displacement occurs. Therefore, the head core and the gap angle are always maintained according to the initial design with respect to the tape running.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings. It should be noted that although the following embodiments describe the case where an audio tape is used, the present invention is not limited to this. Magazine tape,
It goes without saying that the present invention is similarly applied as long as it is a magnetic head used when reproducing information recorded on a magnetic tape such as a video tape.

In the magnetic head device of this embodiment, as shown in FIG. 1, the head mounting space in which the magnetic head 10 is mounted and the tape guide portion 20 are integrally molded, and a head mounting base 30 is formed.
Is equipped with. Then, a lever 40 provided with a cleaning brush is attached to the head mounting base 30 by a pivot 41.
It is attached so that it can turn around.

The magnetic head 10 is provided with recesses 12 and 13 on both sides of the magnetic gap 11 as shown in FIG. Further, brush housing recesses 16 and 17 are formed on the outermost side. A shield plate 18 made of Permalloy or the like is inserted inside the magnetic head 10 to prevent disturbance from occurring in the magnetic head 1.
0 is prevented from entering the inside. Shield plate 1
8 can also be used as a member that constitutes the bottom surfaces of the brush accommodating recesses 16 and 17. A lead 19 (see FIG. 1) for supplying or taking out a driving current, an exciting current, a signal current or the like is attached to the back side of the magnetic head 10.

The head mount 30 to which the magnetic head 10 is fixed is a resin molding which extends to the left and right sides around a head mounting space 31 in which the magnetic head 10 is mounted, as shown in FIG. Head guides 32, 32 project forward from both sides of the head mounting space 31, 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.

At the lower part of the head mount 30, a mounting seat 34 extends rearward. On the lower surface of the mounting seat 34, in order to secure the positional relationship of the head mounting base 30 with respect to the chassis or the like, a positioning projection 35 to be inserted into the hole of the chassis or the like is formed. Then, the positioning protrusion 35
The mounting holes 36 are attached to the mounting seat 34
Penetrates through. Further, the rear center of the mounting seat 34 is formed as a raised portion 37, and a through hole 38 to which a shaft 42 pivotally supporting the lever 40 is fixed is provided in the raised portion 37.

The tape guide portions 20 integrally formed on the left and right sides of the head mount 30 are provided with bent portions 21 and 22 which are bent forward from the head mount 30. During tape reproduction, the bent portions 21 and 22 are inserted into the small window of the cassette half as shown by the dotted line in FIG. Bend 2
Upper projections 21b and 22b and lower projections 21c and 22c are provided on the first and second terminals 22 with the groove portions 21a and 22a having a width corresponding to the width of the magnetic tape sandwiched therebetween. The running magnetic tape has these protrusions 21b, 21c and 22b, 2
Guided by 2c, it passes through the magnetic head in a predetermined positional relationship.

In order to secure the positional relationship between the magnetic tape and the magnetic head 10, the head guide 32 also has a similar groove 32.
You may form the upper protrusion 32b and the lower protrusion 32c which pinched | interpose a. At this time, it is important to have linearity between the head guides 32 and 32 and the tape guide portion 20 in order to ensure stable running of the tape.

At the upper end of the shaft 42 fixed to 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 portion 40v is pivotally supported by a screw 46 together with washers 43, 44, a spring 45 and a collar 48. At the pivotal end of the lever 40, both sides are raised so that the ribs 40a,
40b, and notches 40c and 40d through which the ends of the spring 45 are inserted are formed in the respective 40a and 40b.

The opposite side of the lever 40 is a hanging portion 40v which is bent and extends vertically downward. Droop 40
A brush 47 is provided at v. The brush 47 is
For example, it can be provided by crimping the hanging part 40v with the bristles of nylon fiber, carbon fiber or the like wound around the mandrel being sandwiched. Carbon fiber brush 47
Antistatic is also achieved when using. In the attached 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 contacts 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, the washers 43, 44, the screw 46, etc. are made of copper having excellent conductivity, and the ground plate 49 attached to the lower part of the shaft 42 is fixed to the chassis with the screw 49a. ing. As a result, the lever 40 includes the support column 42, the ground plate 49, and the screw 4
It electrically contacts the chassis via 9a.

The spring 45 is formed in a substantially U-shape, and its both ends are bent in a direction away from each other.
5a and 45b. These tip portions 45a, 45
b is a notch 40c formed in the ribs 40a and 40b of the lever 40 in a state in which the U-shape of the spring 45 is compressed,
Each of the ribs 40a and 40b is inserted into the rib 40d and slightly protrudes laterally from the ribs 40a and 40b. Then, the central portion 45c is colored 4
It is sandwiched between washers 43 and 44 together with 8, and is integrated with the lever 40 by screws 46.

A rib 40 formed at the rear end of the lever 40
The a and 40b serve as stoppers for fixing and supporting the intermediate portion of the spring 45, and also serve as acting portions 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 regularly or at any time along the direction of the arrow in FIG.
The force for moving the drive member 50 can also be obtained by operating a push button provided on the front panel of the tape deck body.

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

At this time, the tip ends 45a and 45b of the spring 45 protruding from the side surfaces of the ribs 40a and 40b first come into contact with the side surfaces of the raised portions 51 and 52. The pressing force of the driving member 50 is absorbed as elastic deformation of the spring 45. After that, the ridges 51 and 52 are replaced by the ribs 40.
It is pressed against a and 40b, and the turning of the lever 40 starts. That is, when the lever 40 starts to rotate, 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 are prevented.
2 protection is achieved.

FIG. 6 is a top view showing the whole in which the lever 40 is pivotally supported on the head mount 30 on which the magnetic head 10 described above is mounted, and the drive member 50 is arranged at the rear end portion of the lever 40. FIG. 7 is a side view showing the whole as well. The lever 40 has a hanging portion 40v that extends vertically downward from a horizontal portion 40h that extends forward from between the reinforcing portion 33 and the upper surface of the magnetic head 10. The brush 47 that is planted on the inner surface of the hanging portion 40v is magnetic. It contacts the front surface of the head 10. Here, the length from the pivotal portion 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 drive 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 the motor, the gear, and the like. As a result, 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 the head is cleaned by rotating the lever each time the direction change operation is performed, the lever 40 rotates in the process shown in FIG.

First, when the magnetic tape is reproduced while running in the direction of the arrow in FIG. 8 (1), the lever 40 is swiveling to the left and the hanging portion 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 paid out in the cassette half (not shown) direction, and the magnetic tape contacts the entire surface of the magnetic head 10.

When the direction change operation is started from the reproducing state, first, the driving member 50 is moved leftward as shown in FIG. 8 (2), and the magnetic head 10 is also released from the contact with the magnetic tape so that the cassette half is removed. fall back. The movement of the drive member 50 and the cassette half continues until the state shown in FIG. 8C in which the rear end of the lever 40 contacts the other raised portion 51. This time is matched with the timing when the magnetic head retracts with respect to the cassette half loaded in the deck.

In the state of FIG. 8C, the magnetic head 10 is in the retracted position. However, the drive member 50 continues to move further leftward. Then, the lever 40 is raised at the raised portion 51.
Push the rib 40a of the
The lever 40 is turned counterclockwise about 1.
By the turning of the lever 40, the brush 47 implanted inside the hanging portion 40v moves to the right while sliding on the front surface of the magnetic head 10 as shown in (4) to (5) of FIG. To do. As a result, foreign matter such as magnetic powder, dust, and oil attached to the front surface of the magnetic head 10 is removed.

The turning of the lever 40 continues until the hanging portion 40v contacts the other head guide 32e. At this time,
The head guide 32e is provided by the buffering action of the spring 45.
The impact of the drooping portion 40v that hits against the bump is alleviated. Further, the brush 47 that is planted inside the hanging portion 40 v is the brush accommodating recess 17 that is provided on the right side of the front surface of the magnetic head 10.
Housed in. Then, in order to perform reproduction in the reverse direction, the magnetic head 10 is fed out and the magnetic tape is made to run in the direction of the arrow shown in FIG. 8 (6).

In this way, the magnetic head 10 is cleaned for each direction change operation, so that the magnetic head 10 in a clean state is always in contact with the magnetic tape, and high quality reproduction is possible. For example, when the tape was normally run with the magnetic powder adhered to the front surface of the magnetic head with oil, the head output could not be obtained due to the effect of the adhered magnetic powder. In contrast, the lever 40
In the case of the magnetic head 10 which was rotated once and cleaned, the output was recovered by 80%. Further, when the cleaning was repeated 10 times, the head output was recovered to 100% to the initial state.

Further, even after the repeated cleaning, the reproduction output at the high frequency was not deteriorated. This means that even if the positional relationship of the head mount 30 with respect to the main body of the device such as the chassis is changed to some extent, the contact state between the traveling magnetic tape and the front surface of the magnetic head 10 is not adversely affected. Is. That is, the tape guide 20 that restricts the running of the magnetic tape guided to the front surface of the magnetic head 10 is integrally incorporated in the head mount 30 together with the magnetic head 10, and the relative positional relationship between the tape guide 20 and the magnetic head 10 is shown. The magnetic tape is guided to the front surface of the magnetic head 10 in a constant state.

As a driving source for moving the driving member 50 in the front 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 the auto-reverse type deck, a mechanism for moving the drive member 50 in accordance with the switching of the tape running direction can be incorporated. Further, a front panel having a cleaning push button may be attached to the deck in order to enable manual operation.

[0036]

As described above, according to the present invention, a lever provided with 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 drive the magnetic head. Cleaning is performed by rubbing the front surface. Therefore, even if a slight displacement occurs between the head mount and the device body due to the impact when the lever is rotated, the relative positional relationship between the tape guide and the magnetic head is not changed at all.
As a result, the magnetic tape is always guided to the gap of the magnetic head in a normal state, and good quality reproduction is performed.

[Brief description of 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 mount.

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

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 mount with a magnetic head and a lever attached

[Fig. 7] Similarly, a side view of the head mount.

FIG. 8 is a process diagram for explaining a lever drive step by step.

[Explanation of symbols]

10 magnetic head 20 tape guide section 30
Head mount 31 Head mounting space 40 Lever 47
Brush (cleaning member) 50 Drive member

Claims (2)

[Claims] 1. A head mounting base integrally provided with a head mounting space in which a magnetic head is fixed and a tape guide portion for restricting tape running, and a lever pivotably supported at a rear portion of an upper surface of the head mounting base. A cleaning member that is planted inside the bent front end of the lever, and a drive member that engages with the rear end of the lever to rotate the lever, and the cleaning member is the magnetic head. A magnetic head device provided with a cleaning mechanism characterized by rubbing the front surface of the magnetic head. 2. A magnetic head device having a cleaning mechanism, wherein the drive member according to claim 1 pivots the lever in the left-right direction by the power transmitted from the tape running system.