JP2668971B2 - Head stabilizer structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a head stabilizer (hereinafter referred to as a stabilizing plate for a flexible magnetic sheet used for an electronic still camera or the like) which is brought into contact with a magnetic head by negative pressure. Pad) structure.

[Summary of the Invention] The present invention has a suction surface for sucking a flexible disk used in, for example, an electronic still camera by negative pressure, and moves to the disk by moving along the radial direction of the disk. In a stabilizer structure in which a head for recording or reproducing information is projected, a recess is formed in the suction surface around the head, and a notch communicating with the recess in a part of the suction surface on the downstream side of the head. In addition, by forming a taper surface on the bottom surface of the notch portion that descends toward the downstream side of the head, it is possible to vary the negative pressure generated between the disk and the suction surface of the stabilizer. Head touch (hit) can be further improved by further reducing the magnetic force to further improve the suction force of the disc by the stabilizer, and when the disc is stopped, It is obtained to be able to reliably release the attractive force.

[Prior Art] For example, since the recording format of an electronic still camera has a short wavelength, in order to stably perform magnetic recording or reproduction with a magnetic head, the magnetic head is placed at the center of a stabilizer (negative pressure type pad). There is a type in which a flexible magnetic sheet-shaped disk is protruded so as to rotate while sucking the flexible plate into the stabilizing plate by negative pressure. This will be described in detail with reference to FIGS. 10 and 12. Reference numeral 1 denotes a disk-shaped stabilizer (pad). The upper surface of the stabilizer 1 is a suction surface 1a for sucking the flexible magnetic sheet disk A by negative pressure, and has a rectangular hole 1b formed in the center thereof. The magnetic head 2 is fixed to the hole 1b with an adhesive 3 so as to protrude by several tens of μm from the suction surface 1a.

The stabilizer 1 from which the magnetic head 2 is projected is moved by the head feeding device 4 of the disk drive device shown in FIG.
The magnetic disk A is reciprocally movable in the radial direction. That is, the head feeder 4 is disposed in parallel with the head carriage 5 to which the stabilizer 1 is fixed and at a predetermined interval on the upper chassis 6a.
A pair of slide shafts 8a, 8b for guiding the spindle motor to the turntable 7 side, and a small-diameter gear 9a of the motor 9 fixed to the lower chassis 6b, and a pin shape projecting on the upper surface of the lower surface of the head carriage 5. And a large-diameter gear 10 having a helical cam 10a engaged with the cam follower 5a for linearly reciprocating the head carriage 5.

When the disk A is held and rotated on the turntable 7 of the spindle motor, the negative pressure (air pressure) of the air flow generated between the disk A and the suction surface 1a of the stabilizer 1 by the rotation of the disk A (air At a pressure lower than the surrounding atmospheric pressure using the viscosity of the fluid), the disk A rotates while attracted to the attraction surface 1a of the stabilizer 1 and a stable contact with the magnetic head 2 is obtained. ing.

However, the negative pressure generated between the suction surface 1a and the disk A tends to vary due to the difference in the flatness of the suction surface 1a of the stabilizing plate 1, and a stable and good head touch cannot always be obtained. was there.

In addition, the undulation and warpage of the disk A during rotation (flatness)
Due to the difference in state (variation), the negative pressure is extremely varied, and the disk A attracts the magnetic head 2 weakly as shown by the solid line in FIG. 12 or the disk A strongly attracts the magnetic head 2 as shown by the alternate long and short dash line. Therefore, there is a drawback that the spacing loss between the magnetic head 2 and the disk A increases and the head touch is deteriorated. As a result, short wavelength magnetic recording / reproducing in the recording format of the electronic still camera is performed. It could not be performed stably.

Further, the suction force obtained when the disc A is rotated is not released even when the disc A is stopped,
Remains adsorbed on the head 2, and there is a possibility that the spindle motor or the like of the disk drive device will not be restarted due to this adsorption force.

In order to solve the above-mentioned drawbacks of the prior art, the present applicant has disclosed in Japanese Patent Application No. 63-147101 that a stabilizer for a head capable of stabilizing negative pressure with a simple structure and improving head touch. Applied for structure. This part will be specifically described with reference to FIGS. 6 and 7 (note that the head feeder 4 and the like used in the electronic still camera in FIG. The explanation is given with reference numerals.)
Reference numeral 1 denotes a stabilizing plate (pad) formed in a disk shape by press working or the like, and fixed to the head carriage 5 of the head feeding device 4 with an adhesive or the like. The upper surface of the stabilizer 1 is a suction surface 1a of a flexible magnetic sheet disk A used in an electronic still camera, and has a rectangular hole 1b formed in the center thereof. A magnetic head 2 whose tip protrudes, for example, by several tens of μm from the suction surface 1 a is fixed to the hole 1 b with an adhesive 3. The adhesive 3 prevents air from leaking from the hole 1b to the head carriage 5 side so that a stable negative pressure state can be maintained.

Then, for example, 50 μm to 20 μm is left around the magnetic head 2 on the attraction surface 1a of the stabilizer 1 except for the outer peripheral side.
An annular concave portion 1c having a concave amount is formed by spot facing by cutting or the like, and the concave portion is formed in a part of the suction surface 1a on the downstream side of the magnetic head 2 in the rotation (progression) direction of the disk A.
A cutout portion 1d is formed so as to communicate with the bottom surface of 1c so as to be substantially flush with the bottom surface. If the concave amount of the concave portion 1c is too small, the disc A will be sucked to the bottom surface of the concave portion 1c, and
If the concave amount of the concave portion 1c is too large, the negative pressure (absolute value) becomes small. Therefore, the negative pressure is set within the range of the predetermined value.

Then, the disk A is loaded on the turntable 7 of the spindle motor in the disk drive device of the electronic still camera, and when the disk A is rotated at a high speed by the motor drive of the spindle motor, the stabilizer 1 is changed due to the change of the air flow accompanying the rotation. Recess 1c of suction surface 1a and disc A
The air pressure between them becomes a negative pressure, the disk A is attracted to the stabilizer 1 side, and the disk A contacts the magnetic head 2 protruding from the stabilizer 1 with a constant contact pressure. At this time, the stabilizer 1
Since the recessed portion 1c is formed around the magnetic head 2 on the attraction surface 1a of the stable plate 1, it is stable regardless of the difference in the flatness of the attraction surface 1a of the stabilizer 1 or the waviness of the disk A during rotation. Variation of the negative pressure generated between the concave portion 1c of the suction surface 1a of the plate 1 and the disk A can be reduced as much as possible, and the head touch can be improved and a stable suction force can be obtained. When the disk A is stopped, the outside air flows from the notch 1d, so that the suction force of the stabilizer 1 can be released, and the motor 9 for moving the magnetic head 2 when the disk A is started.
In addition, an excessive force is not applied to the spindle motor for rotating the disk A and the like, so that they are easily activated.

[Problems to be Solved by the Invention] However, a notch 1d communicating with the suction surface 1a of the prior art stabilizer 1 downstream of the magnetic head 2 so as to be substantially flush with the bottom surface of the recess 1c. However, the bottom surface 1e of the cutout 1d may rise to the suction surface 1a side as shown in FIG. 8 due to variations in the processing accuracy of the component (stabilizer plate 1). When the bottom surface 1e rises in this way, the pressure rises due to the air flow and the suction pressure decreases, and a dynamic pressure is generated at the most raised portion of the bottom surface 1e (the portion closest to the suction surface 1a), as shown in FIG. As indicated by the dashed line, a disadvantage that the disk A floats in a direction away from the suction surface 1a is likely to occur. As a result, it has been pointed out that the contact of the disk A with the magnetic head 2 becomes unstable, and a stable head touch cannot always be obtained.

Therefore, the present invention provides a head stabilizing plate structure that can stably generate a negative pressure with a simple structure, further improve head touch, and reliably release the negative pressure when the disk is stopped. To do.

[Means for Solving the Problems] A suction surface for sucking a disk by a negative pressure is provided. A head for recording or reproducing information on or from the disk by moving along the radial direction of the disk is projected on the suction surface. In the stabilized plate structure, a concave portion is formed on the suction surface around the head, and a cutout portion communicating with the concave portion is formed in a part of the suction surface on the downstream side of the head. A taper surface is formed on the bottom surface so as to decrease toward the downstream side of the head.

[Operation] When the disc rotates, the air flow resulting from this rotation causes negative air pressure between the concave portion of the suction surface of the stabilizer and the disc, and the disc is sucked by the suction surface of the stabilizer and protrudes from the stabilizer. With a constant and stable contact pressure. At this time, since the bottom surface of the notch communicating with the recess is formed as a tapered surface inclined in a direction away from the suction surface toward the outer peripheral portion side, the bottom of the notch and the disk are also formed at the notch. The air pressure becomes negative pressure, the suction force of the disc increases, and a good hit is obtained. Further, when the disk is stopped, external air flows in from the notch communicating with the recess, and the suction force is reliably released.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
The head feeding device 4 and the like used in the electronic still camera of FIG. 9 are incorporated, and the same parts as those of the prior art will be designated by the same reference numerals.

1 and 2, reference numeral 1 denotes a disk-shaped stabilizer (pad) which is fixed to a head carriage 5 of a head feeder 4 via an adhesive or the like. It is a suction surface 1a of a flexible magnetic sheet-shaped disk A used for a still camera, and a rectangular hole 1b is formed in the center thereof. In this hole 1b, a tip portion from the suction surface 1a is formed, for example. The magnetic head 2 protruding by several tens of μm is fixed by the adhesive 3. This adhesive 3 prevents the air from getting wet from the hole 1b to the head carriage 5 side, so that a stable negative pressure state can be maintained. However, on the outside of the peripheral surface of the magnetic head 2 on the attraction surface 1a of the stabilizer 1,
An annular recess 1c having a recess amount of, for example, 50 μm to 20 μm is formed as a counterbore leaving the outer peripheral side, and the suction surface
The notch 1d communicating with the recess 1c is formed in a part of the magnetic head 2 on the downstream side of the magnetic head 2 in the rotation (progressing) direction of the disk 1a as in the configuration of the prior art. here,
A taper surface 1f is formed on the bottom surface of the cutout portion 1d so as to be inclined toward the downstream side of the magnetic head 2 with a predetermined inclination angle.

As described above, according to the head stabilizer structure of the embodiment, the disk A is loaded on the turntable 7 of the spindle motor in the disk drive device of the electronic still camera,
When the disk A rotates at a high speed by the motor drive of the spindle motor, the change in the air flow due to this rotation causes
The air pressure between the concave portion 1c of the attracting surface 1a of the stabilizer 1 and the disk A becomes a negative pressure, the disk A is attracted to the stabilizer 1 side, and the disk A is bottomed by the magnetic head 2 protruding from the stabilizer 1. Contact with contact pressure. At this time, since the bottom surface of the notch portion 1d communicating with the concave portion 1c is formed as a tapered surface 1f inclined in a direction away from the suction surface 1a toward the outer peripheral portion side, as shown in FIG. Even in the portion 1d, the air pressure between the taper surface 1f on the bottom surface of the cutout portion 1d and the disk A is always in a negative pressure state, the suction force increases, and the disk A is moved to the suction surface 1a as shown by the one-dot chain line in FIG. A good head touch can be always obtained by being sucked to the side.

Further, when the disk A is stopped, external air flows from the notch portion 1d communicating with the concave portion 1c, so that the suction force of the stabilizer 1 can be released, and the motor 9 for moving the magnetic head 2 when starting the disk A and An excessive force is not applied to a spindle motor or the like for rotating the disk A, and they can be easily started.

4 and 5 show a stabilizer 1 according to another embodiment. On the inner side and the outer side of the peripheral portion of the magnetic head 2 of the stabilizer 1a of this embodiment, annular double concave portions 1c, 1c are formed so as to face the outer peripheral side and a part of the inner peripheral side. At the same time, the cutouts 1d, 1d communicating with the recesses 1c, 1c are formed in a part of the suction surface 1a on the downstream side of the magnetic head 2 in the rotation (advancing) direction of the disk A.
The bottom surface of the cutout portion 1d on the inner peripheral side, which is formed, is communicated so as to be flush with the recesses 1c, 1c. Further, the magnetic head 2 is provided on the bottom surface of the notch 1d on the outer peripheral side.
Tapered surface 1f that descends with a certain inclination angle toward the downstream of
Is formed. As a result, similarly to the above-described embodiment, it is possible to improve the head touch and obtain a stable suction force, and when the disk A is stopped, the outside air flows in through the notches 1d, so that the stabilizer 1 Can be released and the motor 9 for moving the magnetic head 2 and the spindle motor for rotating the disk A at the time of starting the disk A can be easily started without applying unreasonable force.

In each of the above embodiments, the stabilizing plate 1 is formed in a disk shape. However, the shape is not limited to this, and may be a rectangular shape as long as a stable head touch can be obtained. Further, the recess is not limited to a single layer, a double layer, a plurality of layers such as a triple layer, a quadruple layer, ... Further, the disk is not limited to a disk used in an electronic still camera, but may be any flexible disk-shaped recording medium.

[Effects of the Invention] As described above, according to the present invention, a recess is formed around the head on the suction surface of the stabilizer that sucks the disk by the negative pressure, and a part of the suction surface on the downstream side of the head is formed. A notch communicating with the concave portion is formed on the bottom surface of the notch, and a tapered surface is formed on the bottom surface of the notch toward the downstream of the head, so that a negative pressure is always generated between the disk and the suction surface of the stabilizer. By doing so, the suction power can be increased, and a good head touch can always be obtained. Further, since the suction force can be reliably released by the notch when the disc is stopped, abnormal suction between the disc and the head is eliminated, and an unreasonable force is applied to the drive source that drives the disc and the head. There is no need to worry, and it can be activated smoothly.

[Brief description of the drawings]

1 is a plan view of the stability of a head showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line II-II in FIG. 1, FIG. 3 is an enlarged sectional view of the cutaway portion, FIG. FIG. 5 is a plan view showing a stabilizer of another embodiment, FIG. 5 is a sectional view taken along line VV in FIG. 4, FIG. 6 is a plan view showing a prior art stabilizer, and FIG. 8 is a sectional view taken along line VII-VII in FIG. 8, FIG. 8 is an enlarged sectional view of a notch portion of a prior art, FIG. 9 is a schematic plan view of a disk drive device, and FIG. 10 is a plan view showing a stabilizer of a conventional example. ,
FIG. 11 is a sectional view taken along the line XI-XI in FIG. 10, and FIG. 12 is a partially enlarged sectional view of a stabilizer near the head of the conventional example. 1 ... stabilizer, 1a ... suction surface, 1c ... recess, 1d ... notch, 1f ... taper surface, 2 ... head, A ... disk.

Claims (1)

(57) [Claims] 1. A stable plate structure having a suction surface for sucking a disk by negative pressure, and a head for recording or reproducing information on or from the disk by moving along the radial direction of the disk on the suction surface. In, while forming a recessed portion of the suction surface around the head, a cutout portion communicating with the recessed portion is formed in a part of the suction surface on the downstream side of the head, and the head of the head is formed on the bottom surface of the cutout portion. A stabilizer structure for a head, which is characterized in that a tapered surface is formed so as to descend toward the downstream side.