JP2551908Y2 - Magnetic head device - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a magnetic head device,
In particular, the present invention relates to a magnetic head device provided with a wiper mechanism for cleaning a gap portion of a head core.

[0002]

2. Description of the Related Art A gap between a head core of a magnetic head applied to a recording / reproducing apparatus and a recording medium is slid when recording / reproducing data on / from the recording medium. Dust, magnetic powder, and the like generated by friction and dust and the like adhered to the recording medium from the outside and adhered thereto. If these dusts, magnetic particles, etc. are left attached to the gap of the head core, the recording / reproducing performance of the magnetic head deteriorates, and the recording medium slides through these dusts, magnetic particles, etc., and further friction between each other causes Both parts are cut off, and the life of both the head core and the recording medium is shortened.

[0003] In order to avoid these problems, cleaning of the gap portion of the head core has been conventionally performed. This has been done manually using a cleaning means such as a cotton swab. However, with respect to a magnetic head applied to a recording / reproducing apparatus configured to be integrally incorporated into another structure such as a car stereo or the like, the cleaning means cannot be easily inserted into the gap portion of the head core. It was difficult to clean the gap of the head core.

[0004] To solve this problem, a magnetic head device having a mechanism for automatically cleaning the slide by sliding a cleaning member in a gap portion of a head core when a magazine of a recording medium is attached to or detached from a recording / reproducing apparatus. Has been proposed.

[0005]

However, in the above-described conventional magnetic head device, when the cleaning member is pressed against the gap portion of the head core in order to remove foreign substances adhering to the gap portion of the head core, the magnetic force is generated by this pressing. The position of the head is deviated from the original installation position, whereby the position of sliding with the recording medium is deviated, resulting in a positional deviation of the head core, an angular deviation of the gap, and the like, which adversely affects the performance of the magnetic head.

The present invention has been made in view of the above problems, and has as its object to provide a magnetic head device that does not adversely affect the performance of the magnetic head when cleaning the gap portion of the head core.

[0007]

FIG. 1 is a block diagram showing the principle of the present invention. The magnetic head device 1 shown in FIG. 1 includes a head core 2 having a gap portion 2a for recording and reproducing a signal on and from the recording medium 5 by slidingly contacting the recording medium 5 moving in the direction X; A shield case 3 that has an exposed hole 3b that is in contact with and exposes the gap 2a of the head core 2 and that has a sliding contact surface 3a that has a curved shape with a curvature radius substantially equal to the gap 2a of the head core 2 and covers the head core 2; A magnetic head device having a magnetic head 1a having a wiper mechanism 4 having a wiper 4a for cleaning the gap 2a of the head core 2 by being rotatably supported by and substantially rotated by the magnetic head 3. The sliding surface 3a of the shield case 3 of the magnetic head 1a is
Except for a portion where 2a is exposed, a configuration is provided in which accommodation portions 3c and 3d for accommodating the wiper 4a are provided.

[0008]

In the present invention, since the wiper mechanism is substantially supported by the shield case 3, the position of the head core is fixed even if the wiper presses the gap portion of the head core by fixing the head core in the shield case 3. There is no shift. Further, since the wiper 4a is housed in the housing portions 3c and 3d, the gap portion 2a of the head core 2 is formed.
The wiper 4a is not pressed against the sliding contact surface 3a of the shield case 3 by storing the wiper 4a in the storage portion 3c or 3d except when cleaning is performed. Therefore, deformation of the wiper 4a is prevented.

[0009]

FIG. 2 shows a plan view and a partial cross-sectional view of an embodiment of the present invention, FIG. 3 shows a front view of FIG. 2, and FIG. 4 shows a side view and a partial vertical sectional view of FIG. . The magnetic head device 10 shown in FIG. 1 has a head core 12 having a curved gap portion 12a for recording and reproducing a signal on and from a magnetic tape by slidingly contacting the magnetic tape (the recording medium 5) running in a direction X. And a sliding contact surface 13a having a curved shape with a radius of curvature R substantially equal to that of the gap portion 12a of the head core 12 and having an exposure hole 13b for slidingly contacting the magnetic tape and exposing the gap portion 12a of the head core 12.
Magnetic head 10 having shield case 13 covering
and a gap portion 12a of the head core 12 which is rotatably supported by the head mounting base 15 and rotated.
A wiper mechanism 14 having a brush 14a (the wiper 4a) for cleaning the magnetic head 10a;
The head mounting base 15 is formed integrally with a tape guide 16 having head guides 16c and 16d for preventing the X-direction displacement of the magnetic head 10a in the X direction. The sliding surface 3a of the shield case 3
The center of curvature is a straight line A (vertical direction in FIG. 4) which is parallel to the recording surface of the magnetic tape and is orthogonal to the running direction X of the head core 2 of the magnetic tape with respect to the gap portion 2a. It is also the center. Further, the turning radius of the tip of the brush 4a is slightly smaller than the radius of curvature R of the sliding surface 3a of the shield case 3, and the wiper 4a is pressed against the sliding surface 3a of the shield case 3 with a predetermined pressing force. .

The sliding contact surface 13a of the shield case 13
Has a configuration in which accommodation holes 13c and 13d for accommodating the brush 14a fixed to the surface of the brush base 14d at the end of the wiper mechanism 14 facing the gap portion 12a of the head core 12 are provided.

In the magnetic head device 10 having the above configuration,
The magnetic tape of the recording medium runs in the X direction in FIG. That is, for example, the magnetic tape travels while abutting on the bent portion 16a of the tape guide portion 16, the head guide 16c, the gap portion 12a of the head core 12, the head guide 16d of the tape guide portion 16, and the bent portion 16b in this order.

The bent portions 16a, 16 of the tape guide portion 16
b and the portion of the head guides 16c and 16d at which the magnetic tape slides are cut out to have a width substantially equal to the width of the magnetic tape, and these are used to regulate the sliding position of the magnetic tape at four places. , And azimuth adjustment can be performed reliably. Further, the magnetic head 10a is fixed to the tape guide portion 16 for adjusting the azimuth of the magnetic tape, and the wiper mechanism 14 is supported on the head mount 15 on which the tape guide 16 is integrally formed. By fixing the head core 12 in the shield case 13, the position of the head core 12 does not shift even when the head core 12 is pressed by the brush 14a. In addition, even when the position of the head core 12 is shifted due to an impact or the like when the wiper mechanism 14 is operated from the outside, the position of the tape guide portion 16 to which the magnetic head 10a to which the head core 12 is fixed is also changed. It is shifted integrally with the head core 12. Therefore, the head core 1 for the magnetic tape
2 and the angle of the gap 12a do not occur.

The head core 12 has the following configuration. The magnetic core is curved, and the portions of both ends in contact with each other are defined as the gap portion 12a, and a gap is formed in the gap portion 12a. A coil is wound on the side of the curved core opposite to the gap 12a.

The head core 12 having the above structure is mounted inside the shield case 13 via a core holder 18.
In this embodiment, the core holder 18 is made of a zinc casting, and is provided between the shield case 13 and the head core 12 to serve for positioning and fixing the head core 12.

The exposed hole 13b formed in the sliding contact surface 13a of the shield case 13 is
2a has substantially the same shape as the outer shape of the head core 12, and when the gap portion 12a of the head core 12 is fitted, the gap portion 12a
The gap between the edge and the edge of the exposure hole 13b is configured to be small. In the above-mentioned fitted state, the gap 1
2a is configured to slightly protrude from the sliding contact surface 13a.

At the time of assembling the magnetic head device 10, the head core 12 having the above structure is mounted on the shield case 13 via the core holder 18, and the gap 12a is
3b, the resin is injected into the gap except for the head core 12 and the core holder 18 in the shield case 13 to fix each other and prevent foreign matter from entering between them. After the fixing is completed, the head core 12 slightly protruding from the sliding contact surface 13a of the shield case 13
The gap portion 12a is polished together with the sliding surface 13a so that the sliding surface 13a and the gap portion 12a have the same curved surface and a curved shape having a radius of curvature R centered on the straight line A.

With the above configuration, the magnetic tape can be connected to the gap 12a of the head core 12 and the shield case 1
3 is smoothly slid on the sliding contact surface 13a, and the magnetic tape is not damaged even if the magnetic tape engages with the boundary between the gap portion 12a and the sliding contact surface 13a.

The shield case 13 is made of a magnetic material, and in this embodiment is made of Permalloy. As shown in FIGS.
The sliding contact surface 13a has a shape obtained by cutting a cylindrical wall surface into a rectangular shape, and four side walls are connected to four sides of the sliding contact surface 13a so as to be adjacent to each other. Sliding surface 13
As shown in the above, a substantially rectangular exposure hole 13b into which the gap portion 12a of the head core 12 is fitted is provided at the center of the head a, and the brush 14a of the wiper mechanism 14 is provided on the left and right of the exposure hole 13b as described above. Housing section 13 to be housed
c and 13d are respectively provided through the sliding contact surface 13a.

As shown in FIG. 6, the edges of the storage portions 13c and 13d on the center side of the respective sliding contact surfaces 13a are cut obliquely. With such a configuration, when the brush 14a of the wiper mechanism 14 moves in and out of the housing portions 13c and 13d, the brush 14a moves smoothly,
The brush 14a is not damaged by engaging with the edges of the housing portions 13c and 13d.

When a magnetic tape magazine is attached to or detached from a magnetic tape recording / reproducing apparatus to which the magnetic head device 10 is applied, a wiper mechanism 14 is automatically operated left and right by a mechanism of the magnetic tape recording / reproducing apparatus (not shown), and 1
Dust, magnetic particles and the like adhering to the second gap portion 12a are removed by the brush 14a of the wiper mechanism 14. When this cleaning operation is completed, the wiper mechanism 14 is moved to the left or right in order to secure a moving space for the magnetic tape to slide on the gap 12a of the head core 12. Here, the brush 14a of the wiper mechanism 14 is housed in one of the housing portions 13c and 13d provided on the sliding contact surface 13a of the shield case 13, so that the brush 14a is
The brush 14a can be improved in durability without receiving a pressing force from the brush a.

[0021] The applicant of the present invention applied a wiper mechanism to ensure separation from the magnetic tape when the wiper mechanism 14 was retracted to the right or left in Japanese Patent Application No. 3-100037 filed on the same date. The center of rotation of 14 is closer to the gap 12a of the head core 12 than the center of curvature of the sliding contact surface 13a of the shield case 13, and the turning radius of the wiper mechanism 14 is smaller than the radius of curvature of the sliding contact surface 13a. A magnetic head device was proposed. In this regard, the wiper mechanism 14 comes closer to the sliding contact surface 13a of the shield case 13 when retracting to one of the left and right sides, and at this time, a pressing force larger than the pressing force pressed against the gap portion 12a during cleaning. The brush 14a is pressed against the sliding contact surface 13a. Therefore, when the brush 14a is retracted,
However, there is a problem that the life of the brush 14a is shortened by a larger pressing force applied to the brush. This problem was more serious than in the case of the magnetic head device 10 of the present embodiment in that a larger pressing force was applied to the brush 14a at the time of retreat. However, the above problem can be solved by providing the housing portions 13c and 13d having the above-described configuration on the sliding contact surface 13a of the shield case 13.

In this embodiment, the shield case 13 is used.
The lengths of the receiving portions 13c and 13d provided on the sliding contact surface 13a of FIG. 3 in the vertical direction in FIG. 3 are smaller than the length of the sliding contact surface 13a, but the shape is extended to both ends of the sliding contact surface 13a. The housing portions 13c and 13d do not need to be through holes, and may be configured to only be depressed by press working or the like by the depth in which the brush 14a is housed. In this way, it is possible to prevent intrusion of induced noise from the housing portions 13c and 13d or leakage of the resin when the resin is injected into the shield case 13 during the assembling process.

[0023]

According to the present invention, as described above, the position of the head core is prevented from shifting during cleaning, so that the performance of the magnetic head is not impaired and the durability of the wiper can be improved. As a result, it is possible to prevent the cleaning function from deteriorating due to the wear of the wiper and provide a highly reliable magnetic head device.

[Brief description of the drawings]

FIG. 1 is a block diagram of the principle of the present invention.

FIG. 2 is a plan view of one embodiment of the present invention.

FIG. 3 is a front view of FIG. 2;

FIG. 4 is a side view and a longitudinal sectional view of FIG. 2;

FIG. 5 is a front view of a main part of the shield case of FIG. 2;

FIG. 6 is a longitudinal sectional view taken along the line VI-VI of FIG. 4;

FIG. 7 is a longitudinal sectional view taken along the line VII-VII of FIG. 4;

[Explanation of symbols]

 1, 10 Magnetic head device 1a, 10a Magnetic head 2, 12 Head core 2a, 12a Gap portion 3, 13 Shield case 3a, 13a Sliding contact surface 3b, 13b Exposed hole 4, 14 Wiper mechanism 4a Wiper 14a Brush (wiper) 14d Brush Table 5 Recording medium 15 Head mounting table 16 Tape guide section 16c, 16d Head guide 3c, 3d, 13c, 13d Housing section

Continuation of the front page (56) References JP-A-5-67319 (JP, A) JP-A-58-91519 (JP, A) JP-A-48-20514 (JP, A) Japanese Utility Model 50-75321 (JP, A) , U) Japanese Utility Model Showa 50-75322 (JP, U) Japanese Utility Model Showa 53-39418 (JP, U) Japanese Utility Model Showa 35-6328 (JP, Y1)

Claims (1)

(57) [Scope of request for utility model registration] 1. A head core having a gap portion for recording and reproducing signals on and from a recording medium by slidingly contacting the recording medium, and an exposure hole for slidingly contacting the recording medium and exposing the gap portion of the head core. A magnetic head having a sliding contact surface having a curved shape with a radius of curvature substantially equal to the gap of the head core, and a shield case covering the head core; and a rotating operation substantially supported by the magnetic head to be rotatable. And a wiper mechanism having a wiper for cleaning the gap portion of the head core by performing the operation. The sliding contact surface of the shield case of the magnetic head has a portion where the gap portion of the head core is exposed. A magnetic head device having a configuration in which a housing for housing the wiper is provided in a part except for the housing.