JPH09198760A - Disk clamp device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely clamp a disk by elastically pressing the disk against a turntable with a disk holding member which is turnably held by a cylindrical groove part of the turntable, together with an elastic member. SOLUTION: Three disk holding members 6 are held via their rotary axes (e) by the cylindrical groove part (a) of a recessed part of the turntable 2. Then, the elastic member 7 formed out of a rubber such as silicon rubber in a cross-sectional circular shape is provided between the disk holding member 6 and the turntable 2, to elastically press the disk against the turntable 2 in the radial direction. When the disk is inserted into a clamp hole, the disk holding member 6 is turned around the rotary axis to the outer circumferential side, and the disk is elastically pressed toward the mounting surface in the radial direction, so that the disk can surely be clamped. Moreover, by setting the length of the disk holding member 6 in the projecting direction of a pressing surface longer than the thickness of the disk, the disk is surely brought into contact with the clamp hole, and the device is made thin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc clamp device for chucking (holding) an optical disc in an optical disc device such as a CD player or a CD-ROM player, which is equipped with an optical pickup and rotationally drives an optical disc such as an 8 cm CD or a 12 cm CD. Regarding

[0002]

2. Description of the Related Art In recent years, optical disc apparatuses have been popularized and developed by the development of optical pickups and related technologies, the miniaturization of the optical disc apparatuses, and the establishment of technology capable of obtaining stable performance even when being carried.

Further, under the present circumstances, there is an increasing demand for further thinning of a CD-ROM drive device mounted on a notebook computer or the like.

A conventional disk clamp device for an optical disk will be described below. FIG. 10 shows a sectional view of a conventional disc clamp device.

The disc clamp device is provided at the center of the drive shaft 1 of the spindle motor, the turntable 2, and the turntable 2, and a centering member 3 for centering the optical disc when the optical disc is mounted.
And a steel ball 4 protruding from the three holes of the centering member 3 and a coil spring 5 interposed between the turntable 2, the centering member 3 and the steel ball 4 to repel each other. Has been done.

Next, the operation will be described. If the optical disk is kept horizontal and pressed from above, the optical disk descends along the outer peripheral surface of the centering member 3 provided at the center of the turntable 2.

Then, the engaging holes of the optical disk come into contact with the steel balls 4 provided at three locations, and the engaging holes push the steel balls 4 toward the drive shaft 1 against the elastic force of the coil spring 5. It will be crowded.

When the optical disc is further pressed, the steel ball 4 pushed by the elastic force of the coil spring 5 returns to its original position, whereby the optical disc is centered and held on the turntable at the same time.

[0009]

However, the structure of the above-mentioned conventional disk clamp device has the following problems.

1) The steel ball that holds the optical disk moves up and down freely, so the optical disk can be attached and removed smoothly. However, from the opposite viewpoint, the disk holding force is weak and reliable holding and centering. Will not be possible.

2) For example, the thickness of a CD (CD-ROM) disk is 1.2 mm, and a CD player (CD-
In a ROM player), a steel ball having a diameter of 3 mm is used to hold down the CD, which is an optical disc, from above.

Therefore, the thickness of the clamp device is about 3.5.
A thickness of about mm is necessary. By the way, the thickness T of the optical disk drive device is determined by: T = thickness of optical pickup + thickness of exterior mechanism + clearance for pulling out tray.

Recently, many CD-ROM devices have been mounted on notebook personal computers, and therefore further thinning is desired, but among the thicknesses of the optical disk drive device, the thickness of the disk clamp portion is a steel ball having a diameter of 3 mm. As long as you use, you can't make it any thinner.

3) As described above, since the steel balls of φ3 mm are used, the optical disc has a disc thickness of 1 mm or 1.5 mm which is the limit allowed by the standard, and further the non-standard optical disc (1.7 mm). That is, assuming a poor disk, the above conventional configuration does not generate a force to press the disk from the upper side toward the turntable side, and the bad disk cannot be clamped.

SUMMARY OF THE INVENTION An object of the present invention is to provide a disc clamp device which can securely hold and center even a poor disc and can make the device thinner.

[0016]

DISCLOSURE OF THE INVENTION A disk clamp device according to the present invention mounts an optical disk on a mounting surface of an optical disk mounting means, inserts the optical disk into a clamp hole of the mounted optical disk, and pivots the rotary shaft. As the outer peripheral side is rotated and brought into contact with the clamp hole, the pressing surface of the pressing means presses the optical disk in the radial direction and the mounting surface direction of the optical disk. According to the present invention, the optical disc can be reliably clamped.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is an optical disk clamp device for clamping an optical disk of a donut shape having a clamp hole, and an optical disk mounting means having a mounting surface for mounting the optical disk. And has a pressing surface that projects toward the outer peripheral side of the optical disc in the direction opposite to the mounting direction of the optical disc along the rotation center axis of the optical disc, is inserted into the clamp hole, and is centered on the rotation axis. And a pressing unit that presses the optical disk in the radial direction of the optical disk and in the direction of the mounting surface by rotating to the outer peripheral side and coming into contact with the clamp hole. In this way, the pressing surface of the pressing means is inserted into the clamp hole of the optical disk, rotates around the rotation axis toward the outer peripheral side, and comes into contact with the clamp hole, whereby the optical disk moves in the radial direction and the mounting surface direction. Since is pressed, the optical disc can be reliably clamped.

According to a second aspect of the present invention, in the first aspect of the invention, the length of the pressing surface in the protruding direction is set to be longer than the thickness of the optical disc to be clamped. Thus, in addition to the effect of the invention described in claim 1, since the length of the pressing surface in the projecting direction is set to be longer than the thickness of the optical disc to be clamped, it is ensured in the clamp hole of the optical disc to be clamped. The optical disc can be reliably clamped.

Next, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1A is a block diagram of the disc clamp device according to the present embodiment, and FIG.
The sectional view on the AA line of FIG.

The disc clamp unit comprises a turntable 2 supported by a drive shaft 1 of a spindle motor.
On this turntable 2, three disk holding members 6 are provided at 120 ° intervals.

The turntable 2 is provided with a recess for holding the disc holding member 6 in the initial position, and the disc holding member 6 receives the rotation axis e of the disc holding member 6 on both sides of the depression. A substantially cylindrical groove portion a (see FIG. 8) for rotating the is provided.

The disc holding member 6 is inserted into the clamp hole of the disc DK on the outer peripheral side of the turntable 2 and abuts on the inner diameter of the disc DK. Surface c that presses the disk DK in the direction by the elastic force of the elastic member 7
Is provided.

The elastic member 7 is made of rubber such as silicon rubber, CR, urethane having a circular cross section, and the hardness (rubber hardness) of the elastic member 7 determines the mounting feeling of the disc. .

When the disc holding member 6 is incorporated in the turntable 2, as shown in FIG.
It is configured to be inserted from below.

FIG. 2 is an enlarged side view of the disc holding member 6,
FIG. 3 shows a top view of the disc holding member 6.

The disc holding member 6 is a resin molded part, and in FIG. 2, there is a substantially b-shaped convex portion b near the upper left portion of the disc holding member 6, and below the convex portion b, An engagement surface c having a diagonal straight shape in a side view is provided.

This engaging surface c abuts on the upper edge side of the clamp hole (φ15 mm in the case of a CD) of the disk DK and presses the disk DK in the disk outer diameter direction and the disk mounting surface direction of the turntable 2. Clamp the disc DK.

By setting the length L of the engaging surface c to be sufficiently longer than the thickness of the disc DK to be clamped, it is possible to perform reliable clamping with a margin even when the thickness of the disc DK is full of the standard. Is.

The elastic member 7 abuts on the tapered portion d. Further, a cylindrical rotating shaft e is provided below the disc holding member 6, and when the disc DK is attached or detached, the disc DK is slid along a guide portion formed inside the turntable 2. Is easily attached and detached, and the disc DK is pressed by the elastic force of the elastic member 7 by rotating about the rotating shaft e, so that the disc DK is securely clamped.

Next, the operation of the disc clamp unit will be described with reference to FIGS.

(1) Before Insertion of Disc DK FIG. 4 shows the state of the disc holding member 6 before insertion of the disc DK.

As shown in FIG. 4, when the disc DK is not inserted yet, the disc holding member 6 is pressed in the direction of the arrow in the figure by the elastic force of the elastic member 7, and the disc holding member 6 is centered on the rotation axis e. As a result, the disk holding member 6 is brought into contact with the turntable by the moment generated in the counterclockwise direction in the drawing.

(2) When the disc DK is inserted FIG. 5 shows the state of the disc holding member 6 when the disc DK is inserted.

As shown in FIG. 5, when the disc DK is inserted, first, the inner edge f of the clamp hole of the disc DK is inserted.
Comes into contact with the convex portion b of the disc holding member 6.

Next, the disc holding member 6 moves (g direction) along the guide portion 2a provided inside the turntable 2, and the disc holding member 6 moves downward in the drawing and the shaft 1 ( (See FIG. 1) side.

Along with this, the disc DK descends, and the inner edge portion f of the clamp hole comes into contact with the convex portion b of the disc holding member 6.

(3) Immediately before Clamping of Disk DK FIG. 6 shows the state of the disk holding member 6 immediately before clamping of the disk DK.

As shown in FIG. 6, immediately before the disc DK is clamped, and when the position of the disc DK is positioned below the convex portion b of the disc holding member 6 (retracting), the disc holding member 6 is turned table. The optical disc DK is again moved to the outer peripheral side along the guide portion 2a provided inside the optical disc 2.

Further, the disc holding member 6 is the disc D.
From the state when the K is inserted (see (2)), it rotates in the direction of the arrow about the rotation axis e, and the engagement surface c moves in the radial direction of the disk DK and the disk mounting surface direction of the turntable. Is pressed by the elastic force of the elastic member 7 to be pressed and securely clamped.

(4) When the disc DK is removed FIG. 7 shows the disc holding member 6 when the disc DK is removed.
Indicates the state of.

As shown in FIG. 7, when the disc DK is removed, the inner edge portion f of the clamp hole of the disc DK slides while abutting on the convex portion b of the disc holding member 6 so that the disc holding member is slid. 6 starts rotating in the direction of the arrow around the center h of the rotating shaft e.

As the disc DK further rises, the inner edge portion f of the clamp hole of the disc DK comes into contact with the convex portion b of the disc holding member 6, and the disc holding member 6 is further rotated about the rotation axis e in the arrow direction. Then, the disc DK is removed.

As described above, according to the present embodiment, the disc can be reliably clamped and the clamp can be easily released without being significantly affected by the thickness of the disc DK. .

The state in which the disc holding member 6 is incorporated into the turntable 2 will be described with reference to FIG. By inserting the rotary shaft e into the groove a as shown in the figure, it can be easily mounted.

In the above description, a rubber material is used as the elastic member 7, but a member having an elastic force such as a leaf spring or a coil spring can be used.

[0046]

According to the invention described in claim 1, the pressing surface of the pressing means is inserted into the clamp hole of the optical disk, and is rotated to the outer peripheral side about the rotation axis and abuts against the clamp hole. Since the optical disc is pressed in the radial direction of the optical disc and in the direction of the mounting surface, the optical disc can be reliably clamped.

According to the second aspect of the invention, in addition to the operation of the first aspect of the invention, the length of the pressing surface in the projecting direction is set longer than the thickness of the optical disc to be clamped. The optical disc is surely brought into contact with the clamp hole of the optical disc to be clamped, so that the optical disc can be surely clamped, and further thinning is possible, and discs having different thicknesses can be surely clamped.

[Brief description of drawings]

FIG. 1A is a configuration diagram of a disc clamp device according to an embodiment of the present invention. FIG. 1B is a sectional view taken along line AA of FIG.

FIG. 2 is an enlarged side view of a disc holding member.

FIG. 3 is a top view of a disc holding member.

FIG. 4 is an explanatory view of a state of a disc holding member before a disc is inserted.

FIG. 5 is an explanatory view of the state of the disc holding member when the disc is inserted.

FIG. 6 is an explanatory view of the state of the disc holding member immediately before the disc clamp.

FIG. 7 is an explanatory view of the state of the disc holding member when the disc is removed.

FIG. 8 is an exploded perspective view of a disc holding member and a turntable.

FIG. 9 is an explanatory diagram of a state in which the disc holding member is incorporated in the turntable.

FIG. 10 is a block diagram of a conventional disc clamp device.

[Explanation of symbols]

 1 Drive shaft of spindle motor 2 Turntable 3 Centering member 4 Steel ball 5 Coil spring 6 Disk holding member 7 Elastic member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuyuki Matsumura 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (2)

[Claims] 1. An optical disc clamp device for clamping a donut-shaped optical disc having a clamp hole,
An optical disk mounting means having a mounting surface on which the optical disk is mounted, and a pressing surface protruding toward the outer peripheral side of the optical disk in the direction opposite to the mounting direction of the optical disk along the rotation center axis of the optical disk. A pressing means that is inserted into the clamp hole, rotates around the rotation axis toward the outer peripheral side, and contacts the clamp hole to press the optical disk in the radial direction of the optical disk and the mounting surface direction. And a disc clamping device. 2. The disc clamping device according to claim 1, wherein the length of the pressing surface in the projecting direction is set longer than the thickness of the optical disc to be clamped.