JPH0766609B2 - Magnetic head support device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head support device used in a magnetic disk drive device for recording or reproducing information on a magnetic recording medium formed in a disk shape.

[Conventional technology]

BACKGROUND ART A magnetic disk drive device that records / reproduces information on / from a magnetic recording medium formed in a disk shape (hereinafter referred to as a disk) is currently used as an external storage device of an information processing device such as a computer or a word processor. Widely used.

A still image signal is recorded / recorded on one of these information processing devices.
There is a so-called still video floppy disk drive for reproducing. This disk drive device is mounted on a still video floppy camera, and image information is recorded on the still video floppy disk by an operation similar to that of a camera device using a photosensitive film.

Japanese Unexamined Patent Publication (Kokai) No. 58-576 discloses one type of disk drive device of this type.
Some are disclosed in Japanese Patent Publication No. 67. In this disk drive device, a holder that holds a disk cartridge containing a magnetic recording medium (hereinafter referred to as a disk) is pivotally supported at one end with respect to a mounting substrate having a rotary table. After inserting the cartridge into the holder, the holder is rotated toward the mounting substrate to load the disc in the disc cartridge onto the rotary table.

At the time of loading, the regulation plate attached to the case cover for applying a load pressure faces the magnetic head through the disc.

On the other hand, there is a device disclosed in Japanese Utility Model Publication No. Sho 42-17806 as a device capable of stably contacting a disc and a gear of a magnetic head without using the above-mentioned restriction plate.

This invention is a device for recording and reproducing a signal by rotating an extremely thin magnetic disc sheet of at least 50 μ or less at a high speed so that it can be held in a flat state by centrifugal force, and partially depressing the sheet base at the head mounting portion. The head is characterized in that the head is accommodated in the recessed portion so as to be adjustable, and the head is slightly inclined in the direction opposite to the rotational direction thereof so as to correspond to the deformation of the magnetic sheet passing through the recessed portion having the head attached. With this configuration, the pressure between the magnetic sheet and the sheet base becomes slightly lower than the atmospheric pressure on the upper surface of the magnetic sheet, so that the head mounting surface that has been hung down, that is, the magnetic sheet sinks in the recess, The effect of stabilizing the contact between the magnetic head and the headgear of the magnetic head that is attached by protruding from the head attachment surface is claimed.

By the way, in the former conventional still video floppy disk drive (hereinafter referred to as SVF device), two head gears are provided for recording and reproducing a frame image. For this reason, if the disk is opposed to the two head gears or if the load pressure is different, the recording and reproduction of each field image will be different, and as a result, the image quality of the frame image will be degraded. Therefore, in the case of the regulation plate structure such as the former, the adjustment of the image by the gap adjusting screw becomes extremely important. However, since the regulation plate is formed in a planar shape, the image quality changes significantly due to a slight difference in inclination, and there is a problem that adjustment is very difficult. Further, since the peripheral speeds of the inner diameter side and the outer diameter side of the disk are different, the relative speed between the regulation plate and the disk is also different between the inner diameter side and the outer diameter side. There is also a problem in that the positional relationship changes, and minute differences occur in the images.

On the other hand, in the latter conventional example, the concave portion is in a state of being sucked, so that it faces the head gear tape of the magnetic head in a constant state due to the flexibility of the disk.
Therefore, recording / reproducing can be performed while maintaining a constant image quality without particularly restricting the position of the disk with respect to the headgear.

However, this configuration is a portable disk drive using a disk cartridge, for example, an SVF built in a camera.
When applied to a device, various inconveniences occur. The first
, The disk cartridge is required to be compatible.Therefore, when loaded on the SVF device, there is a variation in the relative positional relationship between the disk and the magnetic head, so when the disk is started, it is immediately sucked into the recess. There is no guarantee that recording / playback will be possible. The second is that the relative position of the disk and the magnetic head changes subtly due to the influence of gravity depending on the direction and attitude of the camera, and when the disk is started for the same reason as the first, recording / recording is performed immediately. There is no guarantee that playback will be possible. Thirdly, if an external shock or vibration is applied during recording / reproduction, the suction of the disk may be released, and recording / reproduction during that time may be disabled.

Therefore, for these reasons, the latter device cannot be applied to a portable disk drive device such as an SVF device.

From these things, the applicant of the present invention aims to provide a magnetic disk drive device that can realize a frame image with excellent image quality without the need to adjust the regulation plate.
No. application has already been filed.

The invention according to this conventional example is a magnetic disk drive device for rotating a disk to record or reproduce information via a magnetic head, and a magnetic head support for projecting and supporting the magnetic head in a recess and a disk. And a restricting means for restricting the maximum separation position of the disk from the magnetic head.

Specifically, as shown in FIG. 9, the magnetic head support 1
Is an annular protrusion 1a on the periphery and a protrusion on the center.
Each support 1 is provided with a recessed portion 1b that is recessed by the amount of protrusion, and the magnetic head 2 is attached in a state of protruding from the attachment hole 1c at the center of the support 1. A pad 4 is provided above the support body 1 as a regulation means for regulating the maximum separated position of the magnetic disk 3 from the support body 1.

[Problems to be solved by the invention]

However, even by the above-mentioned proposal by the present applicant, it has been found as a result of the study by the present inventors that there is some inconvenience in improving the accuracy of the image. Hereinafter, this inconvenience will be described.

FIG. 10 and FIG. 11 are explanatory views showing the states of the magnetic disk 3 at the time of recording / reproducing with respect to the magnetic head support 1 and the magnetic head 2.

FIG. 10 shows a recessed portion of the magnetic head support 1 when the magnetic disk 3 is rotated in the direction of arrow A and a fluctuation .DELTA.H in the height direction which cannot be regulated by the pad 4 occurs in the magnetic disk 3. It shows the variation in 1b. As can be seen from the figure, the magnetic disk 3 is in contact with the magnetic head 2, but is not in contact with the same curvature as the head of the magnetic head 2, so a slight fluctuation in output appears. .

FIG. 11 shows a case where the radius of the protruding portion 1a is small and the area of the recessed portion 1b is small. In this case, probably because the suction force by the recessed portion 1b is small, the fluctuation Δ of the magnetic disk shown in FIG.
It can be seen that the head touch of the magnetic disk becomes unstable with respect to H.

The present invention has been made in view of the technical background as described above, and an object thereof is to generate a vibration in the height direction of a magnetic disk that cannot be regulated by the regulation means.
It is an object of the present invention to provide a magnetic head supporting device capable of deforming a magnetic disk along the curvature of a magnetic head without fluttering, realizing a stable head touch, and minimizing fluctuations in output.

[Means for solving problems]

In order to achieve the above object, the present invention has a magnetic head and a magnetic head supporter that supports the magnetic head, and causes a negative pressure to be generated in the magnetic head by generating a negative pressure according to the rotation of a flexible magnetic disk. In a magnetic head support device in which magnetic disks are opposed to each other, the magnetic head is supported at the center of the magnetic head support, and the magnetic head support is at least an annular first protrusion located at a peripheral portion of the support. Portion and an annular second portion located inside the first protruding portion.
Of the first and second protrusions, and between the second protrusion and the magnetic head, respectively.
It is characterized in that a concave portion is provided.

[Action]

According to the above means, even if the height position of the magnetic disk fluctuates in the recessed portion, the negative pressure generating means can pull the magnetic disk to a predetermined height to define the height position of the magnetic disk. In the magnetic head portion, the fluctuation of the magnetic disk converges and the magnetic disk deforms along the curvature of the magnetic head. As a result, the head touch of the magnetic disk with respect to the magnetic head is stabilized, and the head output can be stabilized.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. In each of the drawings described below, the same reference numerals are attached to the respective parts that are the same as or can be regarded as the same as those of the conventional example, and the description of the respective parts is omitted.

<First Embodiment> FIGS. 1 to 4 are for explaining the first embodiment. FIG. 1 is a sectional view of a magnetic head supporting apparatus according to the embodiment, and FIG. 2 is a plan view thereof. FIG. 3 is an explanatory view showing the relationship between the magnetic head supporting device and the magnetic disk, and FIG. 4 is an explanatory view showing the fluctuation of the magnetic disk and the state of the head touch of the magnetic head.

1 and 2, the magnetic disk support device comprises a magnetic head support 1 and a magnetic head 2 supported by the magnetic head support 1. The magnetic head support 1 is provided with a first annular protrusion 1a similar to the conventional example, and a second protrusion 1d as negative pressure generating means protruding so as to surround the mounting hole 1c inside thereof. A first recess 1b is formed between the first protrusion 1a and the second protrusion 1a. As shown in FIG. 1, the reason why this is the first recessed portion 1b is that the gap forming portion 2a and the second protruding portion 1d of the magnetic head 2 are formed.
This is because the minute second concave portion 1e is also formed between and.

The magnetic head 2 has the gear forming portion 2a inserted into the mounting hole 1c from below and is fixed at a position slightly protruding from the upper surface of the second protruding portion 1d. This projection amount is positive in this example, but may take a negative value depending on the formation position and radius of the second projection 1d.

As described above, when the projecting portions 1a and 1d formed in an annular shape are provided in two steps, the magnetic disk 3 which rotates at a high speed in the direction of arrow A as shown in FIG. 3 has the first concave portion 1b and the first concave portion 1b. Since the negative pressure is generated in the concave portion 1e of 2, the magnetic head support 1 is sucked into the upper surface side and is deformed along the unevenness of the magnetic head support 1. At this time, a negative pressure is generated in the first concave portion 1b according to Bernoulli's theorem due to the difference in the relative positional relationship between the first concave portion 1a and the first concave portion 1b. The height position of the magnetic disk 3 is defined by 1d and the magnetic disk 3 is guided to the gear forming portion 2a of the magnetic head 2. As a result, the gear forming portion 2a is deformed along the curvature of the gear forming portion 2a, and the head touch of the magnetic head 2 with respect to the magnetic disk 3 is stabilized. In the case of this example, a slight concave portion is also formed between the second projecting portion 1a and the gear forming portion 2a,
That is, since the second concave portion 1e is formed, a slight negative pressure is generated even in the second concave portion 1e, so that the deformation of the magnetic disk 3 along the gear forming portion 2a is further ensured.

The magnetic disk 3 when the magnetic disk 3 fluctuates by .DELTA.H in the height direction with respect to the magnetic head supporting device having the above-described structure.
The state is shown in FIG.

As can be seen from FIG. 4, when the magnetic disk 3 fluctuates by ΔH, the negative pressure generated in the first concave portion 1b deforms it with a different curvature, but the second protruding portion 1d The magnetic disk 3 is settled to a substantially constant height above, the fluctuation of the magnetic disk 3 is converged in the second recessed portion 1e, and the gear forming portion 2a is deformed along its curvature. This is the first protrusion 1a
Magnetic disk 3 that could not be absorbed between the first concave portion 1b and the first concave portion 1b
The flapping (fluctuation) is caused by the second protrusion 1d and the second recess 1e.
This is because they are absorbed by and converged.

If the fluttering convergence cannot be converged by the projecting portions 1a and 1d in two steps due to the variation amount of the magnetic disk 3 and the size of flexibility, it may be provided in multiple steps.

<Second Embodiment> A second embodiment is shown in FIGS. 5 (a) and 5 (b). 5 (a) and 5 (b) are a plan view and a sectional view of the magnetic head supporting device, respectively. In the magnetic head support device according to the second embodiment, the second recessed portion 1e is formed wider than in the first embodiment. In this case, the magnetic disk 3 is formed in the second recessed portion 1e. The generated negative pressure becomes even larger than that in the first embodiment, and the fluctuation of the magnetic disk 3 is more reliably converged.

<Third Embodiment> FIGS. 6 (a) and 6 (b) are a plan view and a sectional view of a magnetic head supporting device, respectively, showing a third embodiment in FIGS. 6 (a) and 6 (b). The magnetic head support device according to the third embodiment has a first protrusion 1a on the outermost periphery, a second protrusion 1d on the inside, and an outer edge of the mounting hole 1c of the magnetic head 2. The third protrusion 1f is formed to be lower toward the inside,
The upper surfaces of the first, second, and third protrusions 1a, 1d, 1f have a substantially concave shape, and the first recess 1b is provided between each of the first and second protrusions 1a, 1d. In addition, the second and third protrusions 1d and 1f are provided with a second
Recesses 1e are formed respectively.

In the third embodiment, the magnetic disk 3 is deformed so as to be entirely recessed, and each recess is annularly recessed. In the third embodiment, the third protrusion 1f
Although no recess is formed between the magnetic head 2 and the magnetic head 2, when the magnetic disk 3 is located between the gear forming portion 2a and the upper surface of the third protrusion 1f, the formation of the gear The space formed at the base end portion of the portion 2a functions like a third recess and pulls the magnetic disk 3 toward the base end side, so that the magnetic disk 3 can be easily moved along the curvature of the gear forming portion 2a. It can be transformed.

<Fourth Embodiment> A fourth embodiment is shown in FIGS. 7 (a) and 7 (b). 7 (a) and 7 (b) are a plan view and a sectional view of the magnetic head supporting device, respectively. In the fourth embodiment, grooves 5a and 5b are provided in the first and second protrusions 1a and 1d similar to those in the second embodiment.

In this way, the provision of the grooves 5a, 5b reduces the absorbing power, so that the peripheral speed of the magnetic disk 3 is high and the negative pressures of the first and second recesses 1b, 1e as in the second embodiment are reduced. When the pressure is increased, such grooves 5a and 5b can be formed to adjust the negative pressure. Therefore, it is possible to adjust to a proper negative pressure by changing the opening areas of the grooves 5a and 5b, and to obtain a stable head touch as shown in FIG.

In this case, the formation positions and opening areas of the grooves 5a and 5b should be appropriately selected and are merely design matters.

<Fifth Embodiment> A fifth embodiment is shown in FIGS. 8 (a) and 8 (b). 8 (a) and 8 (b) are a plan view and a sectional view of the magnetic head supporting device, respectively. In the fifth embodiment, the grooves 5a, 5b in the fourth embodiment are replaced by small holes 6a, 6b. In the case of this embodiment, small holes 6c, 6d may be provided so as to communicate with the back surface of the magnetic head support 1 directly from the recessed portions 1b, 1e, as shown by the alternate long and short dash line in FIG. 8 (b). .

As described above, according to the above embodiment, the following effects can be obtained.

Since the magnetic disk 3 can be attracted to the magnetic head 2 in at least two steps and the height position with respect to the magnetic head 2 can be made constant, the magnetic disk 3 can be moved along the curvature of the gear forming portion 2a of the magnetic head 2. Can be transformed. As a result, the magnetic head 2 and the magnetic disk 3
The contact area between them can be widened.

As a result, since the contact area can be widened, the head touch of the magnetic head 2 with respect to the magnetic disk 3 is stable, and a stable head output can be obtained.

Since the magnetic disk 3 is deformed along the curvature of the magnetic head 2, even in the case of a preceding erase type head used for data recording and a two-gear head such as an in-line two-gear head used for image information recording, the average value is obtained for each gear head. An output can be obtained, and the recording / reproducing characteristics are better than those of other types of load pressure applying devices for the magnetic disk 3.

Even with respect to the fluttering of the magnetic disk 3 that occurs during recording / reproduction, since the fluttering is converged by sucking the magnetic disk 3 over at least two stages, the magnetic disk 3 is resistant to fluctuations in the height direction with respect to the magnetic head 2.

For the same reason as above, good recording / reproducing characteristics can be exhibited even when external vibration or shock is applied.

Even if there is a large error in the head height (penetration) of the magnetic head 2 with respect to the reference surface of the magnetic disk 3, the actual penetration is determined by the relationship between the magnetic head support 1 and the magnetic head 2. The allowable range of the mounting height of the magnetic disk 3 with respect to the reference surface is widened, and the assembly becomes easy.

〔The invention's effect〕

As is apparent from the above description, according to the present invention configured as described above, it is possible to attract the magnetic disk over at least two stages with respect to the magnetic head and make the height position relative to the magnetic head constant. Therefore, even if the magnetic disk flutters when the magnetic disk is attracted by the negative pressure, the magnetic disk can be deformed along the curvature of the gap forming portion of the magnetic head,
As a result, the contact area between the magnetic head and the magnetic disk can be increased, and a stable head touch can be obtained.

[Brief description of drawings]

1 to 11 are for explaining an embodiment of the present invention. FIG. 1 is a sectional view of a magnetic head supporting device according to the first embodiment, FIG. 2 is a plan view of the same, and FIG. FIG. 3 is an explanatory view showing the relationship between the magnetic disk and the magnetic head supporting device, and FIG. 4 is an explanatory view showing the relationship between the variation in the height direction of the magnetic disk and the magnetic head supporting device, and FIGS. 5 (a) and 5 (b). 6A and 6B are plan views and sectional views of the magnetic head supporting device according to the second embodiment, and FIGS. 6A and 6B are plan views and sectional views of the magnetic head supporting device according to the third embodiment, respectively. , 7th
FIGS. 8A and 8B are a plan view and a sectional view of a magnetic head supporting device according to the fourth embodiment, and FIGS.
(B) is a plan view and a sectional view of a magnetic head supporting device according to a fifth embodiment, FIG. 9 is a sectional view of a magnetic head supporting device according to a conventional example, and FIGS. 10 and 11 are conventional examples. FIG. 6 is an explanatory view showing the relationship between the magnetic head support device and the magnetic disk according to FIG. 1,10 ... Magnetic head support, 1a, 1d ... Projection, 1b, 1e ...
... recessed part, 2 ... magnetic head, 2a ... gear forming part,
3 ... Magnetic disk, 5a, 5b ... Groove, 6a, 6b, 6c, 6d ... Small hole.

 ─────────────────────────────────────────────────── ─── Continuation of front page (56) Reference JP-A-63-228459 (JP, A) JP-A-64-3873 (JP, A) JP-A-63-229662 (JP, A) JP-A-60- 150264 (JP, A)

Claims (4)

[Claims] 1. A magnetic head and a magnetic head support for supporting the magnetic head, wherein a negative pressure is generated according to the rotation of a flexible magnetic disk so that the magnetic disk faces the magnetic head. In the magnetic head supporting device, the magnetic head is supported at the center of the magnetic head supporting member, and the magnetic head supporting member has an annular first protrusion located at least at a peripheral portion of the supporting member, and the magnetic head supporting member. An annular second protrusion located inside the first protrusion, and the first and second protrusions respectively, and between the second protrusion and the magnetic head, respectively. 2. A magnetic head supporting device having two recesses. 2. The magnetic head support device according to claim 1, wherein the height of the protruding portion is gradually reduced from the outermost peripheral side toward the inner side. 3. A magnetic head support device according to claim 1, wherein said projection has a ventilation path communicating with a space sandwiching the projection. 4. A magnetic head support device according to claim 1, wherein a ventilation path is provided on the back surface of the magnetic head support for communicating a space sandwiching the back surface.