JP3416709B2 - Magnetic head support mechanism - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head support mechanism, and more particularly to an improved magnetic head support. 2. Description of the Related Art In recent years, a magneto-optical disk drive has been developed which writes information on a magneto-optical recording medium such as an MD (mini disk) or reads information written on a magneto-optical disk. ing. [0003] This magneto-optical disk drive device employs a so-called contact type in which a magnetic head is brought into direct contact with a magneto-optical recording medium, or a non-contact type in which the magnetic head is slightly lifted with rotation of the magneto-optical recording medium. There is a so-called floating method. FIG. 4 shows a conventional example of a magneto-optical head support mechanism in a contact type magnetic disk drive.
And in FIG. In the figure, reference numeral 51 denotes a magnetic head of a type performing magneto-optical recording by magnetic field modulation overwriting,
2 is an arm, 53 is a leaf spring as elastic support means, 54
Is a magneto-optical recording medium. The magnetic head 51 includes a slider 55 made of a synthetic resin and formed in a substantially rectangular shape.
And a magnetic head core 56 embedded in a thick portion of the magnetic head. The magnetic head 51 is supported by a free end side of an arm 52 via a leaf spring 53 so as to be relatively displaceable in the vertical direction. The arm 52 is formed of a band-like plate, and one end of the arm 52 is attached to a driving device (not shown) for tilting the arm itself within a predetermined vertical angle range. The end side is formed in a substantially U-shape in plan view. This U-shaped part has a reference numeral 57
Is attached. The leaf spring 53 has a thickness of, for example, 30 to 100 μm.
m, and is formed of an extremely thin stainless steel plate. A rectangular cutout hole 58 is provided at one end thereof, and a cutout piece 59 facing the inside of the cutout hole 58 is provided at a side of the cutout hole 58 near the one end. Is provided, and
A hook 60 is provided at the edge of the one end so as to be bent substantially at right angles and extend upward. This leaf spring 53
The other end is fixed to the base of the U-shaped portion 57 of the arm 52, and the hook 60 at one end is connected to the U-shaped portion 57 of the arm 52.
Is hooked in a hung state at the tip of the camera, so that it is in an oblique posture such that one end is located below the other end. A magnetic head 51 is attached to the free end side of the cutout piece 59 of the leaf spring 53 in a cantilever state, and is inserted into a cutout hole 58 of the leaf spring 53. In a magneto-optical disk drive using such a magnetic head support mechanism, an arm 52 is provided above a magneto-optical recording medium 54 set on a horizontal rotary table.
In the non-operating state, the arm 52 is lifted obliquely upward and the magnetic head 51 is separated from the magneto-optical recording medium 54 as shown in FIG. Is lowered and the magnetic head 51 is placed on the magneto-optical recording medium 54. Incidentally, the magnetic head 51 is supported in a cantilever manner with respect to the leaf spring 53 because the rotating magneto-optical recording medium 54 during the operation is, for example, up-and-down in the vertical direction. Magnetic head 5 for 54 movements
This is to make it possible to follow the magnetic head 51 flexibly and to keep the proper contact state between the magnetic head 51 and the magneto-optical recording medium 54 unchanged. Therefore, the total spring constant of the leaf spring 53, the cutout hole 58, and the cutout piece 59 is
It is considered desirable to set the value as small as possible in consideration of the followability of the magnetic head 51 described above. The flying type is basically the same in structure as the above-mentioned contact type. Although not shown, the slider 55 of the magnetic head 51 is mainly used for rotating the magneto-optical recording medium 54. Accordingly, the difference is that a dynamic pressure groove or the like for generating a pressure that causes the magnetic head 51 itself to float is provided. In the magneto-optical disk drive device employing the above-described conventional magnetic head support mechanism, when it is not operated, that is, in the state shown in FIG. The magnetic head 51 is cantilevered by the cutout piece 59 so that the magnetic head 51 can move freely. Therefore, the cutout piece 59 is largely bent in the vertical direction, and the magnetic head 51 is largely displaced in the vertical direction. Will be. Therefore, in consideration of the occurrence of such a situation, it is necessary to set the distance h2 between the magnetic head 51 and the magneto-optical recording medium 54 sufficiently large so that the magnetic head 51 does not collide with the magneto-optical recording medium 54. There is
In such a setting, the height occupied by the magnetic head support mechanism portion inevitably increases in the height of the entire apparatus, and in order to reduce the height of the entire apparatus, the height dimensions of other parts must be increased. The degree of freedom in design is restricted, such as the need to restrict. By the way, in order to reduce the height of the magnetic head supporting mechanism, the spring constant of the leaf spring 53 is set to be large, and the displacement of the magnetic head 51 when subjected to an impact is limited to a small value. Although it is considered good, in this case, the above-described countermeasure of the magnetic head is deteriorated, so that such a measure cannot be taken. When the magnetic head 51 is repeatedly subjected to an impact, the plastic deformation of the cut-out piece 59 that supports the magnetic head 51 in a cantilever manner progresses, and there is a concern that the degree of sagging of the magnetic head 51 gradually increases. Is done. The present invention has been made in view of such circumstances, and while ensuring flexible followability of a magnetic head during operation,
While minimizing the separation between the magnetic head and the magneto-optical recording medium during non-operation as much as possible, it is possible to prevent the collision of the magnetic head with the magneto-optical recording medium and to receive repeated impacts. It is an object of the present invention to maintain the attitude of a magnetic head almost constant. According to the present invention, there is provided an arm which is disposed above a magneto-optical recording medium and which can be tilted up and down with one end as a fulcrum , and an arm formed at a free end of the arm. To
Elastic support means, formed at one end of the elastic support means
It is provided so as to face the cutout hole, and
Clip that holds the head in a cantilevered state, and the magnetic head
Regulating member that regulates the maximum separation displacement position between the arm and the arm
A magnetic head support mechanism comprising:
The material is the farthest away from the cut-out side and cantilevered
It is a configuration attached to the magnetic head attached in a state . Since the maximum displacement position of the magnetic head with respect to the arm is regulated by the regulating member, even if the distance between the magnetic head and the magneto-optical recording medium during non-operation is set to a minimum value, The setting can be made so as to prevent an unexpected collision with the magneto-optical recording medium. In addition, even when the magnetic head is repeatedly subjected to an impact during non-operation, drooping of the magnetic head is suppressed by the restricting member. On the other hand, since the arm supports the magnetic head in a suspended state via the elastic support means, even if the magneto-optical recording medium rotates vertically during rotation, for example, the arm is supported by the arm. This makes it easier to flexibly follow. In short, according to the present invention, the maximum opposing displacement position of the magnetic head is regulated by using a regulating member different from the elastic support means of the magnetic head, so that the two opposing actions described above can be satisfied simultaneously. I have to. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described with reference to the embodiments shown in FIGS. 1 and 2 relate to a first embodiment of the present invention. FIG. 1 is a perspective view of a magnetic head support mechanism of the first embodiment, and FIG. 2 is a side view of the use state of the mechanism. In the drawing, reference numeral 1 denotes a magnetic head of a type performing magneto-optical recording by magnetic field modulation overwriting, 2 denotes an arm, 3 denotes a leaf spring as elastic support means, 4 denotes a MOD (magneto-optical recording disk) or M
It is a magneto-optical recording medium such as D (mini disk). The magnetic head 1 includes a slider 5 made of a synthetic resin and formed in a substantially rectangular shape, and a magnetic head core 6 embedded in a thick portion of the slider 5. The magnetic head 1 is supported by a free end side of an arm 2 via a leaf spring 3 so as to be relatively displaceable in the vertical direction. The arm 2 is formed of a band-shaped plate, and one end of the arm 2 is attached to a driving device (not shown) for tilting the arm 2 itself within a predetermined vertical angle range. The free end side is formed in a substantially U-shape in plan view. This U-shaped portion is denoted by reference numeral 7. The leaf spring 3 has a thickness of, for example, 30 to 100 μm.
A rectangular cutout hole 8 is provided at one end thereof, and a cutout hole 8 is formed at a side near the one end of the cutout hole 8.
A cut-out piece 9 facing inward is provided. The cut-out piece 9 is bent in a substantially L-shape when viewed from the side, and a sticking part 10 substantially parallel to the entire leaf spring 3 and a sticking part 10
And a hook portion 11 orthogonal to. The other end of the leaf spring 3 is fixed to the base of the U-shaped portion 7 of the arm 2, and the hook 11 of the cutout 9 at one end is connected to the arm 2.
Is hooked in a suspended state at the tip of the U-shaped portion 7, so that one end is positioned obliquely below the other end. The magnetic head 1 is mounted in a cantilevered state on the sticking portion 10 of the cutout piece 9 of the leaf spring 3 and is inserted into the cutout hole 8 of the leaf spring 3.
By attaching the cutout piece 9 to the magnetic head 1 in this manner, the lower end of the hook 11 provided integrally with the cutout piece 9 is attached near the center of gravity g of the magnetic head 1. As described above, in this embodiment, the lower end of the hook portion 11 provided integrally with the cutout piece 9 of the leaf spring 3 is attached to the vicinity of the center of gravity g of the magnetic head 1 so that the weight of the magnetic head 1 can be reduced by the arm. 2 directly. Therefore, the maximum separation displacement position of the magnetic head 1 with respect to the arm 2 is regulated, and the magnetic head 1
The inclination angle θ with respect to the magneto-optical recording medium 4 at the maximum separation displacement position can be made smaller than in the conventional example. That is, the hook portion 11 is a regulating member described in the claims. Next, the operation when the magnetic head supporting mechanism of this embodiment is used in a magneto-optical disk drive will be described. First, as in operation, in a state where the arm 2 is lowered and the magnetic head 1 is mounted on the magneto-optical recording medium 4,
Since hooking of the hook portion 11 with respect to the arm 2 is released, the magnetic head 1 is supported in a cantilever state by the cutout piece 9 of the leaf spring 3. Therefore, even if the magneto-optical recording medium 4 fluctuates up and down during rotation,
The magnetic head 1 can flexibly follow the movement of the magneto-optical recording medium 4. On the other hand, when the arm 2 is raised and the magnetic head 1 is separated from the magneto-optical recording medium 4 as shown in FIG. Since the magnetic head 1 is in the hooked state, the maximum separation displacement position of the magnetic head 1 with respect to the arm 2 is regulated. Therefore, even if an external shock is applied, the magnetic head 1 can be prevented from colliding with the magneto-optical recording medium 4. As described above, when the magnetic head 1 is not operated,
Can reliably be prevented from colliding with the magneto-optical recording medium 4, so that the distance h1 between the magnetic head 1 and the magneto-optical recording medium 4 in the non-operating state can be set to a minimum value. As a result, the height occupied by the magnetic head support mechanism in the magneto-optical disk drive can be made as small as possible. Then, impact tests were performed on the magnetic head supporting mechanism of the embodiment and the magnetic head supporting mechanism of the conventional example. As a test, a 200 G, 8 msec half-sine impact was applied to the arm 2 three times downward and then three times upward, and then the opening angle of the cutout 9 with respect to the leaf spring 3 was measured. Here, the weight of each of the magnetic heads 1 and 51 is 0.07 g, and the distance from the position of the center of gravity of the magnetic heads 1 and 51 to the hanging position is 8 in the case of the product of this embodiment.
mm, and 3.5 mm in the case of the conventional example. As a result, the spread of the opening angle of the cutout pieces 9 and 59 with respect to the leaf springs 3 and 53 was 12 deg in the case of the conventional example, and was 0.7 deg in the case of the present example. It was confirmed that it was small. From this result, it can be said that the structure of this embodiment is a structure that is hardly deformed by an impact. The present invention is not limited only to the above embodiment. FIG. 3 shows a second embodiment of the present invention. The second embodiment differs from the first embodiment in the position at which the magnetic head 1 is suspended from the arm 2. In the second embodiment, a hook 11a separate from the cutout piece 9 of the leaf spring 3 is used, and this hook 11a is attached to the magnetic head 1 at a position farthest from the cutout piece 9. In this way, the downward displacement of the magnetic head 1 during non-operation can be completely eliminated. The hook 11 and the hook 11a can be provided integrally with the slider 5 of the magnetic head 1.
Further, the leaf spring 3 can be replaced by another elastic support member, and the magnetic head 1 can also be of an optical reading type. According to the present invention, the maximum displacement position of the magnetic head with respect to the arm is regulated using a regulating member different from the elastic support means of the magnetic head, so that magneto-optical recording can be performed during operation. While ensuring the flexibility of the magnetic head to follow the medium, the separation distance between the magneto-optical recording medium and the magnetic head is set to a minimum value in a non-operating state, and the magnetic head is able to follow the magneto-optical recording medium. It is designed to prevent any collision. In addition, even when the magnetic head is repeatedly subjected to an impact during non-operation, the sagging of the magnetic head is suppressed by the restricting member, so that the attitude of the magnetic head can be maintained substantially constant for a long period of time. In short, according to the present invention, the amount of displacement of the magnetic head toward the magneto-optical recording medium during non-operation is restricted, so that the distance between the magneto-optical recording medium and the magnetic head in non-operation is minimized. Can be set smaller. Therefore, the height dimension occupied by the magnetic head support mechanism in the magneto-optical disk drive device can be made as small as possible, which contributes to the improvement in the degree of freedom in designing the entire device. The present invention is particularly effective for a portable magneto-optical disk drive device which is strong against impact and whose thickness is desired to be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a first embodiment of a magnetic head support mechanism according to the present invention. FIG. 2 is a side view of the magnetic head support mechanism according to the first embodiment in use. FIG. 3 is a perspective view of a magnetic head supporting mechanism according to a second embodiment of the present invention. FIG. 4 is a perspective view of a conventional magnetic head support mechanism. FIG. 5 is a side view of a conventional magnetic head support mechanism in use. [Description of Signs] 1 Magnetic head 2 Arm 3 Leaf spring 4 Magneto-optical recording medium 9 Cutout piece of leaf spring 10 Adhesion part of cutout piece 11 Hook part of cutout piece

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B 11/105 G11B 21/21

Claims (1)

(57) Claims 1. An arm disposed above a magneto-optical recording medium and capable of tilting up and down with one end as a fulcrum, and an elastic member formed at a free end of the arm. Support means, a cutout piece provided to face into a cutout hole formed at one end side of the elastic support means, and holding the magnetic head in a cantilever state; and a maximum separation displacement position between the magnetic head and the arm. A magnetic head supporting mechanism comprising: a restricting member that restricts the magnetic head, wherein the restricting member is located at a position farthest from the cutout piece, and is mounted on the magnetic head side mounted in a cantilever state. Magnetic head support mechanism.