JPH01122068A - Information recording disk driving mechanism - Google Patents

Abstract

PURPOSE:To lower the height of a disk driving mechanism by supporting a turn table to hold an information recording disk by a supporting shaft fixed on a base member and radial bearing so as to be capable of rotating freely around the supporting shaft and bearing the turn table by a ring-shaped thrust bearing so as to be capable of rotating freely on the base member. CONSTITUTION:At the center of the base member 2 fixed on a chassis 1, the supporting shaft 3 is formed integrally and the turn table 5 is attached at the supporting shaft 3 through the cylindrical radial bearing 4 so as to be capable of rotating freely. The disk-shaped thrust bearing 6 is arranged between the turn table 5 and the base member 2 and at the circumference of the bearing 4 so as to be brought into contact directly with them slidably. A flange part 5a is formed extending over the whole external periphery of the lower part of the table 5, and a roll 7 which is fitted to a supporting pin 2a implanted on the base member 2 so as to be capable of rotating freely is arranged correspondingly to the upper surface of the flange part 5a and prevents the table 5 from falling out from the supporting shaft and the height of the whole driving device is made low.

Description

TECHNICAL FIELD The present invention relates to an information recording disk drive mechanism for rotating an information recording disk such as a digital audio disk.

BACKGROUND ART FIG. 3 shows a side view of a conventional information recording disk drive. As shown in the figure, a cylindrical portion 102a is formed on a base member 102 screwed onto a chassis 101. For example, two radial bearings 103 and 104 are provided in the cylindrical portion 102a.
are provided at a distance H1, and the spindle 105 is rotatably supported by the radial bearing. Further, a disk-shaped thrust bearing 106 is provided on the chassis 101, and one end of the spindle 105 smoothly slides thereon. A turntable 108 carrying an information recording disk 107 is fitted to the other end of the spindle 105. The turntable 108 has a centering hub 108a that fits into the center hole of the information recording disk 107 to center the disk. Further, the turntable 108 and the spindle 105 are provided with rotational force by a motor (not shown).

As described above (in the conventional information recording disk drive mechanism, a spindle 105 that rotates together with the turntable and at least two radial bearings 103 and 104 that rotatably support the spindle are provided between the turntable 108 and the last bearing 106. is arranged, and spindle 1
Both radial bearings 103 are used to prevent rotational vibration of 05.
．． Since the separation distance H1 of 104 also requires a certain size, the height H2 of the entire information recording disk drive mechanism is
This was leading to an increase in

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and its object is to provide an information recording disk drive mechanism that has a low overall height.

An information recording disk drive mechanism according to the present invention includes a turntable that supports an information recording disk, a support shaft fixed on a base member, and a radial bearing that rotatably supports the turntable with respect to the support shaft. and an annular thrust bearing provided around the radial bearing to rotatably support the turntable with respect to the base member.

Embodiments Hereinafter, an information recording disk drive mechanism as an embodiment of the present invention will be explained with reference to the accompanying drawings.

As shown in FIG. 1, a support shaft 3 is integrally formed in the center of a base member 2 fixed on a chassis 1. As shown in FIG. A turntable 5 is rotatably attached to the support shaft 3 via a cylindrical radial bearing 4. A disk-shaped thrust bearing 6 is provided between the turntable 5 and the base member 2 and around the radial bearing 4, and the thrust bearing is in direct sliding contact with the turntable 5.

The thrust bearing 6 is formed into an annular shape and is fitted onto the support shaft 4.

A flange 5 is provided on the outer layer of the lower end of the turntable 5 over the entire circumference.
For example, two rollers 7 rotatably attached to a support pin 2a implanted on the base member 2 are arranged corresponding to the upper surface of the flange 5a,
This prevents the turntable 5 from being removed from the support shaft 3.

The above-described base member 2, support shaft 3, and radial bearing 4
and the thrust bearing 6 constitute a support mechanism that rotatably supports the turntable 5. The turntable 5 has a centering hub 5b that fits into the center hole of an information recording disk 9 (hereinafter abbreviated as disk) to center the disk. Centering hub 5b
is provided so as to protrude from the disk supporting surface of the turntable, and is provided with a coil spring 5c that applies a bias in the protruding direction to the centering hub. The disk 9 is pressed against the disk supporting surface of the turntable 5 by a disk-shaped clamper 10, and rotates together with the turntable 5 in this state.

As shown in FIG. 2, a grease guide 6a is formed on the annular thrust surface of the thrust bearing 6. As shown in FIG.

The grease guide 6a controls the flow of grease supplied between the sliding surfaces of the turntable 5 and the thrust bearing 6 by determining the flow direction of the grease as the turntable 5 rotates. This is to prevent leakage.

The grease guide 6a has a shape that guides grease to the center in the radial direction of the annular thrust surface, and more specifically, the grease guide 6a has a shape that guides grease to the center of the annular thrust surface in the radial direction, and more specifically, the grease guide 6a guides the grease along a circumference centered on the rotation center axis of the turntable 5 and so as to be oriented in the same direction. It consists of a large number of chevron-shaped grooves 6b arranged in parallel at equal pitches.

By configuring the grease guide 6a in this way, the grease is distributed to the thrust bearing 6 as the turntable 5 rotates.
Grease is always supplied over the entire sliding surface of the turntable 5 and the thrust bearing 6, and a highly accurate rotational state is maintained.

In addition, as shown in FIGS. 1 and 2, the grease guide 6a
The inner diameter e is equal to or larger than the outer diameter of the radial bearing 4, and the outer diameter f of the grease guide 6a is
is equal to or smaller than the outer diameter C of the sliding surface between the thrust bearing 6 and the turntable 5.

Effects of the Invention As detailed above, the information recording disc drive mechanism according to the present invention includes a turntable that supports an information recording disc, a support shaft fixed on a base member, and a support shaft that supports the turntable on the support shaft. It consists of a radial bearing that rotatably supports the turntable relative to the base member, and an annular thrust bearing that is provided around the radial bearing and rotatably supports the turntable relative to the base member.

In this way, the rotation support shaft is fixed to the base member and the turntable is attached to the support shaft via the radial bearing provided within the turntable itself, and the turntable directly slides and contacts the thrust bearing. Therefore, the distance between the turntable and the base member becomes zero, and the height of the information recording disk drive mechanism as a whole becomes extremely low.

Furthermore, since the overall height is reduced, each component becomes relatively small, making it easier to manufacture parts with higher accuracy and improving rotational accuracy.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an information recording disk drive mechanism as an embodiment of the present invention, FIG. 2 is a plan view of a thrust bearing that is a component of the information recording disk drive mechanism shown in FIG.
FIG. 3 is a longitudinal sectional view of a conventional information recording disk drive mechanism. Explanation of symbols of main parts 2... Base member 3... Support shaft 4... Radial bearing 5... Turntable 6... Thrust Bearing 6a...Grease guide 9...Information recording disk Applicant: Pioneer Corporation

Claims (1)

[Claims] An information recording disk drive mechanism including a turntable that supports an information recording disk and a support mechanism that rotatably supports the turntable, the support mechanism including a base member and a support fixed to the base member. a radial bearing that rotatably supports the turntable with respect to the support shaft; and an annular thrust bearing that is provided around the radial bearing and rotatably supports the turntable with respect to the base member. An information recording disk drive mechanism comprising: