JPS63269367A - Disk holding device - Google Patents

Abstract

PURPOSE:To suppress the surface shaking of a disk, by providing an air flow generating blade, an air flow suction entry, and an air flow exhaustion exit on a stabilizer that is the pressing means of the disk, and providing a covered plate keeping position relation to secure a micro interval on the disk. CONSTITUTION:The disk 1 is placed on a turntable 4, and also the disk 1 is pressed and held on the turntable 4 by the pressing means 9, and the air flow generating blade 17, the air flow suction entry 18, and the air flow exhaustion exist 19 are provided in the pressing means 9. And the covered plate 20 is provided on a part of a holder 12 which holds the pressing means 9 rotatably freely keeping the position relation where the micro interval 21 exists between the upper plane of the disk 9. In other words, an air flow is generated by the air flow generating means 17 provided in the pressing means 9, and the air flow is poured into the micro interval 21 formed between the disk 1 and the covered plate 20 provided at a part of the holder covering the disk. In such a way, wind pressure is generated in the micro interval 21, and the shaking of the surface of the disk at the time of rotating the disk can be suppressed by the wind pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disc holding device for a video disc player, a compact disc player, etc.

[Prior Art] FIG. 3 is a perspective view schematically showing a conventional disk holding device;
Fig. 4 is a sectional view of the center side, and in the figure, (1)
(1a) is a disk for recording and reproducing information, and (1a) is a disk (
1) is the center hole provided in the center.

(2) is a drive source, such as an electric motor, that rotates the disk (1) during recording and playback, (3) is a spindle directly connected to the drive source (2), and (4) is a drive source fixed to the tip of the spindle (3). It is a turntable, whose center hole (4a) is inserted into the spindle (3), and a screw (5) is screwed into the shaft (4b), and the tip of this screw is inserted into the spindle (3).
It is assembled integrally by pressing the
l) is the diameter dimension of the turntable (4).

Reference numeral (6) denotes a centering adapter which is movably provided at the center of the upper surface of the turntable (4) using the spindle (3) as a guide, and whose upper outer circumferential surface is formed into a conical shape. (7) is the turntable (4) and alignment adapter (
The coil spring (8) interposed between the spindle (3) and the coil spring (8) is a stopper provided at the tip of the spindle (3) to restrict upward movement of the alignment adapter (6).

(9) is a stabilizer as a pressing means for pressing the disc (1) placed on the top surface of the turntable (4) from above onto the turntable, and the ball (10) provided at the center of the top surface is a bearing. (11) recess (l
(L2) is a stabilizer (9) that is rotatably held in the disk (L2) and rotates in synchronization with the rotation of the disk (1).
This is the diameter of the disk pressing part.

(12) is a holder that fixes the bearing (11) and movably supports the stabilizer (9).
3) is rotatably attached to a support piece (14) on a pivot (15).

(16) is a coil spring interposed between the holder (12) and the base (13), and the stabilizer (9) is attached to the holder (12).
) is applied to the upper surface of the disk (1). The diameter dimension (Ll) of the turntable (4) and the diameter dimension (L2) of the pressing part of the stabilizer (9) are (L,
)> (L2).

Next, the operation will be explained. When the disc (1) is placed on the turntable (4) so that its center hole (1a) matches the centering adapter (6), the disc (1)
is locked by the conical part of the centering adapter (6).

After that, when the holder (12) is rotated in the direction of the arrow,
The stabilizer (9) comes into contact with the top surface of the disc (1),
The bearing (11) is biased by the coil spring (16).
The stabilizer (9) presses the disc (1) onto the turntable (4) via the ball (1o).

Therefore, the disk (1) is held on the turntable (4) without eccentricity by the action of the alignment adapter (6), so when the drive source (2) is rotated, the spindle (3)
) rotates, and the disk (1) rotates without eccentricity.

On the other hand, when the recording/playback device is finished, the holder (12
) in the direction of the arrow against the coil spring (16), the stabilizer (9) is lifted and the disc (1)
The held state of is released.

[Problems to be Solved by the Invention] Since the conventional disc holding device is configured as described above, the diameter dimension (Ll) of the turntable (4) and the diameter dimension (L2) of the pressing part of the stabilizer (9) ) and (L
l)〉(L2), and according to the standard of the disc (1), the turntable (4)
There is a limit to the size of the diameter dimension (Ll).

Therefore, when the disc (1) rotates, the turntable (4)
) The part of the disk (1) outside the diameter dimension (L, ) of the disk ( There were problems such as having an adverse effect on recording and playback (1).

In addition, conventional disc holding devices include turntables (1
) and the pressing part diameter (L2) of the stabilizer (9) have a relationship of (Ll)<(L2), but in this configuration, deformation stress is applied to the disk (1). There were some problems, such as how it worked.

This invention was made to solve the above-mentioned problems, and aims to provide a disk holding device that does not apply unreasonable deformation stress to the disk and can minimize surface runout during rotation. .

Means for Solving Problem E] A disk holding device according to the present invention places a disk on a turntable, presses and holds the disk on the turntable with a pressing means, and holds the disk in the pressing means. A wind flow generating blade, a wind flow inlet, and a wind flow outlet are provided, and a cover plate is provided on a part of the holder that rotatably holds the pressing means in a positional relationship such that a minute gap exists between it and the upper surface of the disk. It is something.

[Function] The disk holding device according to the present invention generates a wind flow using wind flow generating blades provided on the pressing means, and forms this wind flow between the disk and a cover plate provided on a part of the holder that covers the disk. By pouring it into the small gap, wind pressure is generated in the small gap, and the wind pressure suppresses the vibration of the disk when it rotates.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 and 2, in which the same parts as in FIGS. 3 and 4 are denoted by the same reference numerals. FIG. 1 is a perspective view schematically showing a disc holding device according to the present invention, and FIG. 2 is a sectional view from the center thereof. In FIGS. 1 and 2, (17) is a wind flow generation blade provided in the stabilizer (9), (18) is a wind flow inlet, and (19) is a wind flow generation blade provided in the stabilizer (9).
) is the wind outlet, (20) is the cover plate of the disk (1) provided in a part of the holder (12), and (21) is the cover plate (20).
) and the disc (1).

The wind flow generating blade (17) is formed so that a wind flow is generated in the directions of arrows B and C when the stabilizer (9) rotates. In addition, the diameter dimension (L3) of the covering plate (20)
is set to be equal to the outer diameter (L4) of the disk (1).

Next, the operation will be explained. When the disc (1) is placed on the turntable (4) so that its center hole (1a) matches the centering adapter (6), the disc (1)
) is locked by the conical part of the adapter (6).

After that, when the holder (12) is rotated in the direction of the arrow,
The stabilizer (9) comes into contact with the top surface of the disc (1),
The bearing (11) is biased by the coil spring (16).
The stabilizer (9) presses the disc (1) onto the turntable (4) via the ball (10). Therefore, when the drive source (2) is rotated, the spindle (3) rotates and the disk (1) rotates.

The stabilizer (9) synchronizes with the rotation of the disc (1).
) also rotates, and at this time, due to the action of the wind flow generating vanes (17) provided on the stabilizer (9), as shown in Fig. 2, the wind flow is directed from the wind flow inlet (18) to the wind flow outlet (19). Air currents are generated in the directions of arrows B and C, and the minute gap (2) between the cover plate (20) on the holder (12) and the disc (1) is generated.
Flows into 1).

Due to this wind flow, wind pressure is generated in the minute gap (21), and the diameter dimension (L3) of the covering plate (20) is
), the wind pressure is applied up to the diameter (L4) of the disk (1). This wind pressure can suppress the surface deflection of the disk (1) in the direction of arrow A.

On the other hand, once recording and playback are completed, if the holder (12) is rotated in the direction of arrow D' force against the coil spring (15), the stabilizer (9) will be lifted and the holding state of the disc (1) will be released. It will be destroyed.

In addition, in the above embodiment, using the coil spring (16),
Although the holder (12) is biased and used as a means for pressing the stabilizer (9), the stabilizer (9) and the turntable (4) are made of a magnetic material, and the magnetic force of the stabilizer (9) is used as a means for pressing the stabilizer (9). Good too.

[Effects of the Invention] As described above, according to the present invention, the stabilizer, which is a means for pressing the disc, is provided with wind flow generating blades, a wind flow intake port, and a wind flow outlet, and a position is provided on the disc to ensure a minute gap. In this connection, a cover plate is provided, and wind pressure is generated in the minute gap by the wind flow from the stabilizer, and the wind pressure is used to suppress the surface runout of the disc, so the disc can be easily fixed without applying excessive force to the disc. This has the effect of suppressing surface runout.

[Brief explanation of the drawing]

FIG. 1 is a perspective view schematically showing a disc holding device according to the present invention, FIG. 2 is a sectional view from the center side thereof, FIG. 3 is a perspective view showing a conventional disk holding device, and FIG. 4 is a central side view thereof. FIG. In the figure, (1) is the disk, (2) is the drive source, and (3) is the disk.
) is a spindle, (4) is a turntable, (9) is a pressing means (stabilizer), (12) is a holder, (17)
(18) is a wind flow inlet, (19) is a wind flow outlet, (20) is a covering plate, and (21) is a minute gap. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Agent: Patent attorney Masuo Oiwa (and 2 others) Figure 2 4: Yu-7 table 19, air outlet

Claims (2)

[Claims] (1) A turntable fixed to a spindle rotated by a drive source, a disk placed on the turntable so that the center hole faces the tip of the spindle, and a pressure force that presses and holds the disk on the turntable. In the disk holding device, the disk holding device has a wind flow generation vane, a wind flow inlet and a wind flow outlet formed on the pressing means, and a part of the holder that rotatably holds the pressing means on the disc. 1. A disk holding device comprising: a cover plate provided to form a minute gap. (2) The disk holding device according to claim (1), wherein the diameter of the cover plate and the diameter of the disk are set to be equal.