JP2000057666A - Disk unit - Google Patents

Abstract

(57) [Summary] The current consumption of the spindle motor 2 is significantly increased due to the windage loss of the disk 1 which increases with high-speed rotation, and it has become difficult to reduce the power consumption of the disk drive device. A disk drive provided with first, second, and third windage reduction walls (19, 22) of a wall structure provided with gaps on an upper surface, a lower surface, and an outer peripheral side surface portion of a disk (1) mounted on a spindle motor (2). The device. Thereby, the vortex of the air generated by the centrifugal force accompanying the rotation of the disk 1 is reduced as much as possible, and the windage loss and noise of the disk 1 generated at the time of high-speed rotation are reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive, and more particularly, to reducing windage loss caused by rotation of a disk serving as a recording medium, thereby reducing current consumption of a spindle motor, and generating the disk drive with rotation of the disk. The present invention relates to a disk device configured to shield noise generated by the disk drive.

[0002]

2. Description of the Related Art High-speed rotation of a disk has been progressed with high-speed data transfer. For this reason, the drive current of the spindle motor has rapidly increased with the number of rotations of the disk. Of the increase in drive current, the effect of resistance (windage) due to the flow of air on the disk surface is very large.
In a magnetic disk drive using a disk made of a high-rigidity material such as glass or aluminum and fixed completely to a rotating system under high-precision positioning, for example, Japanese Unexamined Patent Publication No. 9-2
Japanese Patent No. 04767 or JP-A-7-254256 discloses an invention relating to a flow on a disk surface due to a disk peripheral structure.

[0003]

In the above-mentioned conventional example, a disk is used which is a low-rigidity resin material and whose shape is largely deformed by press working, and which uses a replaceable medium.
No consideration is given to D-ROM, DVD-ROM, and DVD-RAM devices.

[0004] Disk devices (eg, CD-ROM, DVD-ROM, DVD-R) using exchangeable exchangeable media
AM), the rotation speed of the disk has been increased in order to improve the data transfer speed. For this reason, the drive current of the spindle motor has increased significantly, making it difficult to reduce the power consumption of the disk drive. Of the increase in the drive current of the spindle motor, the windage loss due to the rotation of the disk is dominant.

Since the windage increases in proportion to the third power of the rotational speed of the disk, the drive current of the spindle motor rapidly increases as the rotational speed of the disk increases. The drive current ratio of the spindle motor to the current consumption of a disk device such as a 24 × or 32 × CD-ROM device is １ ／ or more. At present, the above-mentioned windage accounts for more than half of the current consumption of the spindle motor.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a disk drive capable of using a replaceable disk made of a low-rigidity resin material and having a large deformation of a finished shape. An object of the present invention is to reduce the drive current of a motor and reduce the power consumption of a disk device. Another object of the present invention is to realize a low-noise disk device as a configuration for shielding noise generated during high-speed rotation of a disk.

[0007]

In order to achieve the above object, in a disk-shaped recording medium having an information recording surface mounted on a rotary drive, a gap is provided on the outer peripheral side of the recording medium, and the recording medium is A wall structure higher than the upper surface of the recording medium in the held state is provided on the outer peripheral portion of the recording medium.

In a disk-shaped recording medium having an information recording surface mounted on a rotary drive, a lower surface is provided with a movable area of a recording or reproducing detection head and a center of rotation of the rotary drive. A wall structure member having a notch hole is provided, a wall structure member having a notch hole or a step is provided in a fixing portion of the recording medium on the upper surface portion, and a wall structure member is provided on the entire periphery of the recording medium on the outer peripheral side portion. These wall structural members were formed with a gap to a recording medium in a recording or reproducing state. As the member, a medium holding member for loading and unloading a recording medium and a holding member for fixing the recording medium to a rotary driving device were used.

In addition, a structure is adopted in which a surface area of at least half of the recording medium mounted on the rotary drive device is surrounded by a wall structure having a gap with the recording medium.

Further, the gap between the recording medium and the wall structure provided on the upper and lower surfaces of the recording medium is set to 0.5 mm to 5 mm, and the gap between the wall structure provided on the outer peripheral side surface of the recording medium and the recording medium is set to 0 mm. The disk device had a thickness of 0.2 mm to 1.2 mm.

A ring-shaped member larger than the outer diameter of the recording medium is provided in a disk cartridge for storing the recording medium, and the recording medium is arranged inside the ring.
A disk cartridge in which the recording medium is sandwiched between the upper lid and the lower lid of the cartridge with a gap or a disk cartridge integrally formed with the ring may be used.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 3 is a perspective view of a disk drive using a replaceable medium according to an embodiment of the present invention.

The operation of the disk device is as follows. In order to carry in (or carry out) the disk 1, which is a disk-shaped recording medium, into the device, a loading mechanism (not shown) moves the disk tray 5 for guiding the disk 1 to the front of the device. It is made to protrude from a carry-in / out hole provided in the panel 12. After the user places the disk 1 on the disk tray 5, the disk 1 is stored in the apparatus by the loading mechanism.
The disk tray 5 has a circular concave portion that is larger than the outer circumference of the disk 1 and the disk 1 is placed in the concave portion. Further, as described later, a notch is provided on the bottom surface of the concave portion of the disk tray 5 so that the shaft of the spindle motor 2 and the turntable 3 can protrude upward.

Next, the operation of storing the disk 1 in the apparatus will be described. When the disk tray 5 is protruded to the outside, the unit mechanical chassis 11 inside the apparatus and the spindle motor 2 fixed to the unit mechanical chassis 11 are lowered below the position where the disk 1 is reproduced. The disk 1 is loaded into the apparatus by the loading mechanism, and when the center of the disk 1 comes to the center position of the spindle motor shaft 16, the unit mechanical chassis 11 and the spindle motor 2 fixed to the unit mechanical chassis 11 return to the position in the reproducing state. Come up to return. Although this mechanism is not shown in the drawing, it rotates by a system having a certain rotation axis via a mechanical gear.

The disc 1 has a center hole. The center hole of the disc 1 is fitted to a boss provided on the turntable 3 of the spindle motor 2 by the operation of the unit mechanical chassis 11 and the like. 3 are positioned. At the same time, the upper surface is fixed by the disk clamper 4 attached to the clamper holder 9 provided on the mechanical base 15. For fixing, a magnetic attraction force is usually used by a magnet provided on the turntable 3 and a suction member (iron piece) provided on the disk clamper 4. That is, the turntable 3 and the disk clamper 4 constitute a recording medium holding unit.

The disk 1 fixed to the spindle of the spindle motor 2 is rotated by the spindle motor 2 at a specified rotation speed. After that, data recorded on the disk 1 is read or data is written on the disk 1 by the head 6 (not shown) provided in the unit mechanism chassis 11. The head 6 has a drive mechanism that can move in the radial direction of the disk 1. Unit mechanical chassis 11
Is mounted with a spindle motor 2 and a head drive mechanism. Vibrations and shocks transmitted from the outside of the apparatus to the unit mechanical chassis 11 are attenuated by the insulator (elastic body) 10, and the unit mechanical chassis 11 is attached to the mechanical base 15 via the insulator 10.

The disk drive is constructed such that these mechanisms are mounted on the bottom cover 14 and the top cover 13 and incorporated into a computer device or the like.

In the disk device, the rotation speed of the disk 1 has rapidly increased with the improvement of the data transfer speed. For example, a CD using a replaceable medium having a disc diameter of 120 mm
In a ROM device, the disk rotation speed of a 32 × speed device has reached 7,500 revolutions per minute. Therefore, the windage of the disk 1 has increased rapidly, and the ratio of the drive current of the spindle motor 2 to the current consumption of the disk device has increased.

The drive current of the spindle motor 2 is represented by windage,
Determined from copper loss, shaft loss, iron loss, and transistor loss. In the case of a 24 × -speed CD-ROM device, the disk rotation speed is 5 / min.
At 500 rotations, the current due to the windage at this time occupies almost half of the drive current of the spindle motor 2. The means for reducing windage is not to disturb the flow of air (vortex 17 generated by centrifugal force) on the rotating disk 1 surface.

In the disk drive according to the embodiment of the present invention shown in FIG. 3, a disk tray 5 for loading / unloading a disk is provided.
The present invention has a configuration for providing the above-mentioned effects. Disc tray 5
Indicates that the disk 1 is in a state where the disk 1 is
Are fixed to the turntable 3 of the spindle motor 2. The disk tray 5 is arranged with a gap on the lower surface so that the disk 1 does not come into contact with the disk 1 during rotation.

A general disk tray 5 has a disk 1
In a state in which the tray is housed in the apparatus, a circular groove 25 for mounting the tray is provided lower than the reference surface with a surface one step lower than the height of the front surface that fits in the apparatus as a reference surface, and a circumferential portion 27 of the groove is provided. Is provided with a taper 26. Further, a notch hole 23 is provided in a moving range of the head 6 for reproducing or recording information on the disk 1, and the hole 23 is formed in the circular groove 2.
5 was provided so as to straddle the circumferential portion 27. As described above, the reason why the circular groove 25 is provided so as to straddle the circumferential portion is that the projecting portions of the unit mechanism (the head portion, the head support mechanism portion, and the peripheral portion of the spindle motor) disposed below the disk tray are arranged. This is because they are arranged with sufficient margin to avoid them.

In one embodiment of the present invention, a notch hole 23 provided in the moving range of the head 6 of the disk tray 5 is provided in the circular groove 25, and the circumferential portion 27 of the circular groove has a tray When the disc is mounted in the apparatus, the groove is made deeper than the conventional groove so as to sufficiently cover the outer peripheral side surface of the disc 1 with the disc having the height that fits in the apparatus when the disc is mounted in the apparatus. In addition, in order to reduce the protrusion of the unit mechanism, for example, a structure using a lens having a long focal length may be used as the condenser lens used in the head unit.

Hereinafter, a specific configuration and effects will be described with reference to FIGS.

FIG. 2 is a side sectional view showing the vicinity of the disk 1 and the spindle motor 2 of a general disk device. The turntable 3 is fixed to a shaft 16 of a spindle motor. The disc 1 is fixed to the turntable 3 by a disc clamper 4 in a state where the disc 1 is centered. The disk 1 is rotatably supported by a spindle motor 2.

As described with reference to FIG.
When the disk is loaded, the disk 1 is guided by the disk tray 5, but when the disk 1 is supported by the spindle motor 2,
The disc tray 5 has a gap from the lower surface of the disc 1. In the outer peripheral portion of the disk 1, as shown in the figure, the disk tray 5 has a portion 28 (notch hole 23 provided in the moving range of the head 6 in the description of FIG. (In the case of straddling the peripheral portion 27), or a portion having a tapered portion 26 on the outer peripheral side surface of the disk 1.

In such a disk drive, the windage of the disk 1 increases rapidly with the high-speed rotation of the disk 1, and the ratio of the two drive currents of the spindle motor to the current consumption of the disk drive becomes very large. .

FIG. 1 is a side sectional view showing the vicinity of a disk 1 and a spindle motor 2 of a disk device according to an embodiment of the present invention. The disk 1 is fixed to a turntable 3 by a disk clamper 4. At this time, the disc clamper 4 is rotatably supported by a clamper holder 9, and the clamper holder 9 has a shape that is larger than the outer diameter of the disc 1 and covers the upper surface of the disc 1 (the disc clamper 4 side) ( Hereinafter, the upper surface of the disk 1 is referred to as a first windage reduction wall 19).

The lower surface of the disk 1 (spindle motor 2
A disk tray 5 for loading and unloading a disk (hereinafter, referred to as a second windage reduction wall 19 on the lower surface of the disk 1 and a third wind side on the outer peripheral side of the disk) is provided on the side of the disk 1. When the disk 1 is stored in the disk device, the clamper holder 9 and the disk tray 5 are superimposed on each other at the outer periphery.

At this time, the clamper holder 9 and the disc tray 5
A gap is provided so as not to contact with. In the conventional configuration, the windage reduction walls 19 and 22 of the present invention do not exist on the upper surface portion and the outer peripheral side surface portion of the disk 1, and the gap between the disk 1 and the disk tray 5 at the lower surface portion is about 3 mm to 5 mm.
By reducing the gap between the upper surface, the outer peripheral side surface, and the lower surface of the disk 1, it is possible to reduce windage loss during disk rotation.

An example of a specific structure for reducing windage loss of the disk 1 during high-speed rotation will be described. The disk 1 used in the disk drive device of the present invention is made of a low-rigidity resin material by press working or the like. For this reason, the finished state of the disk 1 has warpage, partial dimensional variation in plate thickness, outer shape, tolerance variation in the inner diameter of the center hole of the disk 1, and the like. For example, in the structure for reducing the windage loss of a straight 120 mm disc 1 for a CD-ROM, the standard deviation of the disc 1 is ± 0.5 mm.
Therefore, it is necessary to assume that the vertical runout amount of the disk 1 during rotation is ± 0.5 mm at the maximum.

The mounting of the disk 1 and the rotating body is as follows.
The disk 1 is attached to the boss provided on the turntable 3 of the spindle motor 2 which is a rotating body due to the inner diameter tolerance of the center hole of the disk 1 and the outer diameter tolerance of the boss.
The amount of eccentricity of the disk 1 must be assumed to be about 0.2 to 0.3 mm. Disc 1 considering these values
It is necessary to determine the distance between the wall and the windage reduction wall.

When a high-precision disk is rotated at high speed, the velocity of the air flowing on the disk surface is close to the rotational speed (peripheral speed) of the disk 1 near the surface of the disk 1 and decreases as the distance from the surface increases. The distance to the disk 1 at which the speed at which the air flows rapidly rises is called the boundary layer of the speed, and is usually about 100 μm. When a structure for reducing windage is provided in this boundary layer, a very large effect can be obtained.

That is, in the disk 1 described above,
Taking into account the amount of runout and eccentricity during rotation of the disc 1 (addition)
Then, the boundary layer becomes 0.6 mm in the vertical direction of the disc 1,
In the circumferential direction, it is 0.3 to 0.4 mm. In one embodiment of the present invention, a windage reduction wall is provided in the boundary layer. Needless to say, if the windage reduction wall is closest to the disk 1, the maximum loss of eccentricity and eccentricity during rotation of the disk 1 may be set. Therefore, the first windage reduction wall 19 on the upper surface side of the disc 1 and the disc 1
, The distance between the second windage reduction wall 19 on the lower surface side of the disk 1 and the lower surface of the disk 1 (b, c in the figure) is 0.5 mm or more and 5 mm or less. The gap (a in the figure) between the third windage reduction wall 22 and the outer peripheral side surface of the disc 1 is 0.2 mm or more and 1.2 m.
m or less.

For example, in the case of a disc 1 for a CD-ROM having a disc diameter of 120 mm and a disc plate thickness of 1.2 mm, the height of the space for accommodating the disc 1 with the upper and lower gaps of the disc 1 being equal to 2. 2mm to 11.2
mm. The radial dimension of the storage space for the disk 1 is 120.4 mm or more and 122.4 mm or less. Of course, considering the actual apparatus, it is very difficult to provide the gap evenly over the entire surface of the disk. For example, even if a gap is locally small or large, the windage reduction effect can be obtained.

DVD or CD-ROM with a diameter of 8 cm
Of the disk 1 using the disk 1 (plate thickness: 1.2 mm) according to the standard deviation of the disk 1, the inner diameter of the center hole of the disk 1, and the outer diameter tolerance of the boss of the turntable 3 of the spindle motor 2. The same effect can be obtained by using the windage loss reducing walls 19 and 22 in consideration of the eccentricity caused by the eccentricity. Specifically, the runout of the 8 cm disk 1 is ± 0.15 mm at the maximum. Therefore, the amount of vertical deflection during rotation of the disk 1 is also up to ± 0.15.
mm must be assumed. The positional deviation (the amount of eccentricity at the time of disk rotation) at the time of fitting due to the inner diameter tolerance of the center hole of the disk 1 and the outer diameter tolerance of the boss portion of the turntable 3 of the spindle motor 2 is 0.2 to 0.3 m.
m, and the distance between the disk 1 and the disk windage walls 19 and 22 must be determined in consideration of this numerical value.
In this case, the distance between the first windage reduction wall 19 and the upper surface of the disk 1 (b in the figure) and the distance between the second windage reduction wall 22 and the lower surface of the disk 1 (c in the figure) are 0.1 mm. 15mm or more and 5mm
It was as follows. The distance (a in the figure) between the third windage reduction wall 22 and the outer peripheral side surface of the disk 1 was set to 0.2 mm or more and 1.2 mm or less (the same as the case of the disk 1 having a diameter of 120 mm).

Disk 1 (diameter: 1.2 m) having a diameter of 8 cm
In the structure of the disk device using m), the height of the space for accommodating the disk 1 with the upper surface interval and the lower surface interval of the disk 1 matched is 1.5 mm or more and 1.2 mm or less. The radial dimension of the disk 1 storage space is 120.4 m.
m or more and 122.4 mm or less.

The disk drive shown in FIG. 2 and the disk drive according to one embodiment of the present invention shown in FIG. 1 are caused by the flow of air (vortex 17 generated by centrifugal force) on the disk surface inside the circle shown by the broken line in the figure. The effect of windage reduction will be described with reference to a model diagram. In the case of the disk 1, the spindle motor 2 and the peripheral structure of FIG. 2, when the disk 1 rotates at a high speed, a vortex 17 as shown in FIG. Due to the vortex 17, a resistance force in the rotation direction is generated on the surface of the disk 1, which becomes the rotation resistance force of the spindle motor 2. The resistance portion 18 due to the vortex is generated almost on the entire surface of the disk 1 as shown in FIG.

When the upper surface, the lower surface, and the outer peripheral side surface of the disk 1 are covered with first, second, and third windage reduction walls as in the embodiment of the present invention shown in FIG. 1, the centrifugal force is generated. The vortex 17 is small in the outer peripheral portion as shown in FIG.
7, the resistance portion 18 with respect to one rotation of the disk becomes smaller only at the outer peripheral portion of the disk 1. That is, in the structure of the embodiment of the present invention, the resistance area on the disk surface can be reduced as compared with the conventional structure, so that the rotational resistance of the spindle motor 2 can be reduced. That is, since the drive current of the spindle motor 2 due to the high-speed rotation can be reduced, power consumption can be reduced while suppressing the current consumption of the disk device. In addition, there is also an effect of suppressing the disk runout due to the flow of air in the gap.

Here, the first, second, third 19, and 22 wind loss reducing walls 19,
Although the embodiment using 22 has been described, it is basically important to suppress the circumferential vortex 17 of air generated on the surface of the disk 1, and the effect of the third windage reduction wall 22 is the most important. is there. To this end, by providing a gap on the outer peripheral side surface of the disk 1 and providing a wall structure 22 having a height sufficiently covering the plate thickness of the disk 1 on the outer peripheral portion of the disk, windage loss accompanying disk rotation can be reduced. In this case, only the third windage reduction wall 22 provided on the disk tray 5 on the lower surface of the disk 1 described with reference to FIG.
It is not necessary to make the upper clamper holder 9 as large as the outer diameter of the disk 1. For example, even if the clamper holder 9 is smaller than the outer peripheral wall of the disk tray 5, the above-described windage reduction effect can be obtained if the area covering the upper surface of the disk is larger than that of the conventional structure.

Next, a description will be given of the effect of shielding noise (fluid noise, noise generated by minute vibrations caused by the disk or its components) caused by the rotation of the disk according to the configuration of the embodiment of the present invention. The noise generated by the rotation also increases significantly as the rotation speed increases. This is because the rotation of the disk 1 causes an air flow from the center of the disk 1 to the outer periphery. This is because flow velocity fluctuations or pressure fluctuations due to the flow of the air occur, which depend on the rotation speed of the disk 1.

When a high-precision disk is rotated at high speed, the velocity of the air flowing near the disk surface is close to the rotational speed (peripheral speed) of the disk 1 near the surface of the disk 1 and decreases as the distance from the surface increases. The distance to the surface of the disk 1 at which the air flow speed rises rapidly is called the boundary layer of the speed, and is about 100 μm for a disk having a diameter of 120 mm. In this boundary layer, the flow of air is disturbed, causing turbulence. That is, pressure fluctuation due to the turbulent flow occurs near the surface of the disk 1, and fluid noise is generated. In addition, the turbulence generated on the surface of the disk 1 may cause minute vibrations on the disk 1 and generate sound.

Such a sound propagates with the flow of air from the center of the disk 1 toward the outer periphery when the disk 1 rotates near the disk 1. In the configuration around the conventional disk 1 shown in FIG. 2, since there is no member that restricts the flow in the circumferential direction of the disk 1, the generated sound spreads in the apparatus together with the flow of air, and the top cover 13 shown in FIG. The light is propagated to the outside of the apparatus from the loading hole 15 of the disk 1 provided in the front panel 12.

In the structure of the present invention shown in FIG. 1, the fluid noise is first generated by the first windage reduction wall 19 of the clamper holder 9,
The air flow is regulated by the second windage reduction wall 19 and the third windage reduction wall 22 provided on the disc tray 5, and the sound is shielded. Sound transmitted or passed through these windage reduction walls is further shielded by the top cover 13, the mechanical base 15, and the like. That is, the configuration of the present embodiment can provide a double sound insulation effect, so that noise of the disk device can be reduced. In the disk device, particularly, noise in front of the front panel 12 is a problem.
Wall of the side of the disk 1 (third windage reduction wall 22)
May be provided only on the front panel 12 side. This is because the wind noise reduction wall 22 is provided in a path along which the fluid sound generated by the rotation of the disk 1 is transmitted to the front panel 12, thereby obtaining the fluid sound shielding effect.

FIG. 4 is a diagram showing a configuration around a disk 1 and a spindle motor 2 according to an embodiment of the present invention in a disk device. FIG. 4B is a cross-sectional view,
(A) is a top view, (c) is a bottom view.

In the case of an actual disk device, a head 6 for reading information from or writing information to the disk 1 is arranged on the lower surface of the disk 1 and moves in the radial direction of the disk 1. Therefore, as shown in the figure, the second windage reduction wall on the lower surface of the disk 1 must be provided with a hole in the portion including the moving range of the head 6 and near the rotation center of the spindle motor 2 (in the magneto-optical disk device). In some cases, heads may be provided on the lower surface and the upper surface of the disk 1. In this case, holes are provided in the upper surface as well as the lower surface. Further, the first windage reduction wall 19 must be provided with a hole or a groove near the rotation center of the spindle motor 2.

The first, second and third windage reduction walls 19 and 22 covering the disk 1 are １ ／ of the surface area of the disk.
By covering the above, the vortex 17 due to the centrifugal force described above can be suppressed, and the resistance to one rotation of the disk can be reduced. Thereby, the spindle motor 2
Can be reduced.

FIG. 5 shows a contact portion of a member forming the first windage reduction wall 19 and the third windage reduction wall 22 according to an embodiment of the present invention in a state where the disk 1 is stored in the apparatus. 2 shows a configuration. (A) has a first windage reduction wall 19, for example, has a damper holder 9 and second and third windage reduction walls 19, 22. For example, an elastic body 20 is provided between the contact portions of the disk tray 5, for example. Through. For example, sponge, rubber, or the like may be used for the elastic body. As a result, the sealing performance is improved, so that the vortex 17
Can be reduced. In addition, it also has a sound shielding effect due to the sealing property. (B) is the third windage reduction wall 2
2 are provided with tapered portions above and below. (C) is one in which a curvature is provided above and below the third windage reduction wall 22.
In both cases, the vortex in the circumferential direction of the disk 1 can be reduced by 17.

The arrangements (a), (b) and (c) shown in the figures are similar to those of the lower surface of the clamper holder 9 provided around the clamper holder 9 and the disk tray 5 and the disk tray 5.
It is also possible to adopt a configuration in which the side portions of are superposed on each other. Although not specifically shown in the drawing, the side portions are overlapped on the circumferential portions of the clamper holder 9 and the disc tray 5.
Further, a concave portion and a convex portion may be provided in the overlapping portion, and a meshing portion may be provided. A similar effect can be obtained with such a configuration. Needless to say, some gaps may occur in the actual overlapping portion, but the same effect can be obtained without being limited to the complete sealing.

Further, the sealing performance can be improved by sandwiching an elastic body (elastic body 20 described with reference to FIG. 5) in the overlapping portion. Further, by providing a tapered portion on one or both of the overlapping portions of the clamper holder 9 and the disc tray 5, the sealing performance when overlapping can be improved.

The configuration described above is an embodiment using the clamper holder 9 and the disk tray 5 arranged on the upper and lower surfaces of the disk 1 in a state where the disk 1 is housed in the apparatus. It goes without saying that a component for newly obtaining the same effect may be provided without using these components.

FIG. 6 shows the effect of reducing the drive current of the spindle motor 2 when the first, second and third windage reduction walls 19 and 22 according to one embodiment of the present invention are provided. is there. The figure shows the drive current according to the number of rotations of the spindle motor 2 when the disk 1 is not attached and the spindle motor 2 when the disk 1 is attached according to the conventional configuration.
And the drive current according to the disk rotation speed of the spindle motor 2 when the disk 1 according to one embodiment of the present invention is attached. The drive current without the disk 1 is the drive current of the spindle motor 2 itself without any windage damage caused by the disk 1.

The difference from the drive current according to the conventional configuration with the disk 1 indicates the increase in the drive current due to the disk 1 windage. The windage reduction effect according to the embodiment of the present invention is the difference between the drive current according to the present invention and the drive current according to the present invention when the disk 1 is attached, as indicated by the hatched portion. , The windage loss of the disk 1 can be reduced by about 25%. As the rotation speed of the disk increases, the effect of reducing the windage loss increases.

FIG. 7 shows a disk cartridge structure for storing the disk 1 using one embodiment of the present invention. The disc cartridge includes a cartridge upper cover 7, a lower cover 8, a disc 1, and a shutter 21. The disk cartridge is accommodated in the disk drive, and the upper surface, the lower surface, and the outer peripheral side surface of the disk 1 are covered by the structure of the disk cartridge in a state where the disk 1 is fixed to the spindle motor 2. Specifically, the upper and lower surfaces of the disk 1 are covered by the cartridge upper lid 7 and the lower lid 8, and the outer peripheral side surface of the disk 1 is, for example, a ring-shaped member having an inner diameter larger than the outer diameter of the disk 1. 24 were provided. Disk 1 upper surface,
By setting the gap between the lower surface and the outer peripheral side surface to the value described with reference to FIG. 1, the vortex generated by the centrifugal force during one rotation of the disk can be suppressed, and the drive current of the spindle motor 2 can be reduced. Regarding the ring 24, the third windage reduction wall 22 may be formed by integrally molding the cartridge lower lid 8.

[0054]

According to the disk device of the present invention described above, since the windage loss of the disk which increases with high-speed rotation can be reduced, the drive current of the spindle motor can be reduced. For this reason, it is possible to provide a low power consumption disk device compatible with high-speed transfer.

Further, the wind pressure on the disk recording surface can be controlled by the structure of one embodiment of the present invention, and the effect of suppressing the surface runout of the disk can be obtained at the same time. As a result, the servo during recording / reproduction can be stabilized, and a highly reliable disk device can be provided.

Further, the effect of shielding noise generated due to the rotation of the disk can provide a disk device with low noise.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing the vicinity of a disk and a spindle motor of a disk device according to an embodiment of the present invention.

FIG. 2 is a side sectional view showing the vicinity of a disk and a spindle motor of a general disk device.

FIG. 3 is a perspective view of a disk device showing one embodiment of the present invention.

FIG. 4 is a configuration diagram showing the vicinity of a disk and a spindle motor of a disk device according to an embodiment of the present invention.

FIG. 5 is a peripheral configuration diagram of an outer peripheral portion of a disk showing one embodiment of the present invention.

FIG. 6 is a diagram showing a spindle motor driving current reduction effect at the time of high-speed rotation of a disk according to an embodiment of the present invention.

FIG. 7 shows a disc cartridge structure using one embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Disc, 2 ... Spindle motor, 3 ... Turntable, 4 ... Disc clamper, 5 ... Disc tray,
Reference numeral 6: recording / reproducing head, 7: disk cartridge upper lid, 8: disk cartridge lower lid, 9: clamper holder, 10: insulator (elastic body), 11: unit mechanical chassis, 12: front panel, 13: top cover, 14 ... Bottom cover, 15 ... Mechanical base, 1
6: spindle motor shaft, 17: vortex generated by centrifugal force, 18: resistance part due to vortex, 19: first and second windage reduction walls, 20: elastic body, 21: shutter, 22: third Windage reduction wall, 23: hole for recording / reproducing head, 24: windage reduction ring, 25: circular groove on disk tray, 26
... taper of the circumferential portion, 27 ... circumferential portion of the groove on the disk tray, 28 ... portion where the disk tray wall does not exist on the outer peripheral side surface.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shinobu Yoshida 502 Kandate-cho, Tsuchiura-city, Ibaraki Pref. Inside the Machine Research Laboratories, Ltd. Inside the Machinery Research Laboratory (72) Inventor Toshiaki Kobari 502, Kandachi-cho, Tsuchiura-shi, Ibaraki Pref. Inside the Machine Research Laboratory, Hitachi, Ltd. (72) Inventor Hayato Shimizu 502, Kintachi-cho, Tsuchiura-shi, Ibaraki Pref. 72) Inventor Nobuyuki Kumasaka 1410 Inada, Hitachinaka-shi, Ibaraki Pref., Ltd., Visual Information Media Division, Hitachi, Ltd. (72) Inventor Hisahiro Miki 1410, Inada, Hitachinaka-shi, Ibaraki Pref., Video Information Media Division, Hitachi, Ltd. (72 Inventor Hirofumi Taguchi 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Hitachi video information media business unit

Claims (7)

[Claims] 1. A holding member for sandwiching and holding a disk-shaped recording medium, a rotation drive section for rotating the holding member, and a concave portion having a circumference larger than the outer circumference of the recording medium, wherein the recording portion is formed in the concave portion. In a disk device having a tray on which a medium is placed and transported to the holding unit or discharged from the holding unit, an outer peripheral height of the concave portion of the tray is higher than an upper surface of the recording medium in a state where the recording medium is held. A disk drive characterized in that: 2. A holding member for sandwiching and holding a disk-shaped recording medium, a rotation drive section for rotating the holding member, and a concave portion having a circumference larger than the outer periphery of the recording medium, wherein the recording portion is formed in the concave portion. In a disk device having a tray on which a medium is placed and transported to the holding unit or discharged from the holding unit, the depth of the concave portion of the tray is larger than the plate thickness of the recording medium and smaller than the height of the tray insertion port. And a lid that overlaps with a peripheral portion of the tray so that a space is provided at a predetermined interval between the upper and lower surfaces of the recording medium when the holding unit holds the recording medium. A disk device characterized by the above-mentioned. 3. The disk device according to claim 1, wherein a notch hole is provided in the recess of the tray so that a recording and reproducing head can record and reproduce information. 4. A recording medium mounted on a rotary drive section, wherein
4. The disk device according to claim 3, wherein the disk device is configured to be surrounded by a wall structure having a gap having the above surface area. 5. The disk device according to claim 3, wherein the gap between the recording medium and the wall structure provided on the upper and lower surfaces of the recording medium is 0.5 mm to 5 mm. 6. The disk device according to claim 1, wherein a gap between the recording medium and a wall structure provided on an outer peripheral side surface of the recording medium is set to 0.2 mm to 1.2 mm. 7. A holding member for sandwiching and holding a disk-shaped recording medium, a rotation driving portion for rotating the holding member, and a circular recess having a circumference larger than the outer periphery of the recording medium, wherein the recording is performed in the recess. In a disc device having a tray on which a medium is placed and conveyed to the holding unit or discharged from the holding unit, when the recording medium is held by the holding body, the peripheral edge of the tray and the peripheral edge of the holding body are A disk device, wherein a space is formed by contacting with almost no gap.