JP3011843B2 - Disk clamp mechanism of optical disk device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk clamp mechanism for an optical disk apparatus, and more particularly, to a disk clamp mechanism for clamping two kinds of thin disks.

[0002]

2. Description of the Related Art In a conventional disk clamping mechanism for clamping an optical disk by adsorbing a magnet provided on a clamper to a magnetic metal plate provided on a turntable, a magnet provided on a clamp member holding portion of the clamper is attached to the turntable. The clamp member holding portion is fixed by being attracted to the provided metal plate, and the disc guide member urged upward by a spring against the turntable fits into the center hole of the disc to position the disc, thereby holding the clamp member. The disc is pressed against the turntable by the clamp member against the pressure of the disc guide member by the elastic force of the spring disposed between the portion and the clamp member.

[0003]

In the above-described conventional disk clamp mechanism, when a thin disk is clamped, the spring disposed between the clamp member holding portion and the clamp member expands, so that its elasticity becomes small and the disk becomes thick. There is a disadvantage that the clamping force when clamping a thin disk is considerably smaller than when clamping a disk.

[0004] The present invention has been made in view of the above points, and an object of the present invention is to provide a disk clamping mechanism that can obtain a sufficient clamping force even when a thin disk is clamped. .

[0005]

A disk clamp mechanism of an optical disk apparatus according to the present invention includes a turntable fixed to a spindle motor, a disk guide member urged upward by a spring with respect to the turntable, and a turntable. A suction member provided, and a clamper which is lifted and lowered above the turntable, wherein the clamper presses the disk against the turntable, a clamp member holding portion which holds the clamp member movably up and down, In a disk clamp mechanism including a spring disposed between the clamp member holding portion and the clamp member to bias the clamp member downward, and a suction member provided on the clamp member holding portion and suctioning the sucked member, When clamping a thick disc, the disc guide member fits into the disc center hole Push the disc upwards Te, suction force of the clamp member and the clamp member holding portion and is in close contact suction member and the suction member and approaches suction member is applied to the disk,
When clamping a thin disk, the suction member descends until it comes into contact with the member to be sucked, whereby the disk guide member is pushed down and separated from the disk, further the clamp member separates from the clamp member holding portion and the elasticity of the spring for urging the clamp member Are added to the disk.

[0006]

According to the disk clamping mechanism of the optical disk apparatus of the present invention, when clamping a thick disk, the suction force of the suction member is applied as a force for pushing the disk downward from the clamp member, and urges the disk guide member upward. The elasticity of the spring acts as a force to push the disk upward. Therefore, the force with which the disk is pressed against the turntable, that is, the clamping force, is obtained by subtracting the elasticity of the spring from the sum of the suction force of the suction member and the gravity of the disk.

When a thin disk is clamped, the disk guide member is separated from the disk, and only the elastic force of the spring for urging the clamp member is applied to the disk. Therefore, the clamping force is equal to the sum of the elastic force of the spring and the gravity of the disk. Become.

By setting the suction force of the suction member, the elasticity of the spring for urging the disk guide member and the elasticity of the spring for urging the clamp member to appropriate values, the clamping force for clamping a thick disk and the thin disk can be reduced. Each of the clamping forces at the time of clamping can be set to an optimum value.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A disk clamp mechanism of an optical disk device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing a disk clamp mechanism of an optical disk apparatus according to an embodiment of the present invention. In the figure, reference numeral 1 denotes a rotating shaft of a spindle motor. A turntable 3 is fixed to the rotating shaft 1 via a boss 2.

Reference numeral 6 denotes a ring-shaped magnetic metal plate,
It is fastened to the turntable 3 by screws 7. Three screws 7 are fastened to the thick rib of the turntable 3 at equal intervals.

The disk guide member 4 is loosely fitted on the rotating shaft 1 and is urged upward by a compression coil spring 5. Ribs connecting the inner peripheral portion and the outer peripheral portion of the disk guide member 4 are provided at three places at equal intervals, and extend below the metal plate 6. That is, the metal plate 6 regulates the upper position of the disc guide member 4. Disc guide member 4
The outer peripheral portion is narrowed so as to guide the optical disk 8. Protrusions 4 a whose height is greater than the thickness of the metal plate 6 are provided on three ribs of the disc guide member 4.

The portion held by the clamper lifting member 20 is a clamper. The clamp member holding portion 9 is fitted with the guide member 10 to be integral therewith. An upper plate 11 is fastened to the clamp member holding portion 9 by three screws 12. The ball 15 pressed by the clamper elevating member 20 is press-fitted into the upper part of the guide member 10.

The clamp member 13 is a clamp member holding portion 9
, And is urged downward by three compression coil springs 14. The three claws 13 a provided on the clamp member 13 are engaged with the clamp member holding portion 9 to regulate the downward position of the clamp member 13.

The ring-shaped magnet 16 is adhered to the yoke 17. The yoke 17 is locked to the clamp member holding portion 9 by three stepped screws 19. The compression coil spring 18 urges the yoke 17 downward.

Next, the operation of the disk clamp mechanism having the above configuration will be described. The optical disk 8 is placed on the disk guide member 4 by a loading mechanism as shown in FIG. The elasticity of the compression coil spring 5 is larger than the weight of a large-diameter thick disk (for example, a 30 cm LD disk), and the disk guide member 4 supports the optical disk 8 at the upper limit position regulated by the metal plate 6.

From the state shown in FIG.
0 starts falling. The clamper is a clamper lifting member 2
0, the clamp member 13 comes into contact with the optical disk 8 as shown in FIG.

The clamper elevating member 20 further descends from the state shown in FIG. 2, and the clamper elevating member 20 pushes the ball 15 as shown in FIG. The clamp member holding portion 9 descends, and the elasticity F ₁₄ of the compression coil spring 14 is applied from the clamp member 13 to the optical disk 8.

The resilient F ₁₄ increases as the clamper lifting member 20 is lowered. The elasticity of the compression coil 5 spring is F
_{5. If} the gravity of the optical disk 8 is W, F ₁₄ > F ₅ −W
From the point in time when the optical disk 8 is
Then, it descends and comes into contact with the turntable 3.

The clamper elevating member 20 further descends,
When the magnet 16 approaches the metal plate 6 and its attraction becomes greater than the elasticity of the compression coil spring 14, the clamper descends without being pushed by the clamper elevating member 20,
As shown in FIG. 4, the clamp member 13 comes into close contact with the clamp member holding portion 9.

Thereafter, the clamper elevating member 20 moves up to the clamped state shown in FIG. The state shown in FIG. 5 shows a state in which a thick disk is clamped, and the magnet 16 is connected to the protrusion 4 a of the disk guide member 4 and the metal plate 6.
Not in contact with The clamping force at this time is M + W−F _{5 where} M is the attraction force of the magnet 16.

When clamping a thin optical disk, the clamp member 13 is further lowered so that the state shown in FIG. 5 is changed to the state shown in FIG.
Adhere to The magnet 16 comes into contact with the projection 4a of the disc guide member 4 and pushes down the disc guide member 4. The disc guide member 4 moves away from the thin optical disc 8a.

Further, the clamp member 13 away from the clamp member holding portion 9, the elasticity F ₁₄ of the compression coil spring 14 is applied to the thin optical disk 8a. The clamping force at this time is F ₁₄ + W.

The elasticity F ₁₄ of the compression coil spring 14, by appropriately selecting the suction force M elasticity F ₅ and the magnet of the compression coil spring 5, when clamping the clamping force and a thin disk when clamping thick disk Can be set to optimal values.

[0024]

According to the disk clamping mechanism of the optical disk apparatus of the present invention, it is possible to optimize the clamping force when clamping a thick disk and the clamping force when clamping a thin disk.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a disk clamp mechanism of an optical disk device according to an embodiment of the present invention.

FIG. 2 is a sectional view showing an operation state of the disk clamp mechanism.

FIG. 3 is a sectional view showing another operation state of the disc clamp mechanism.

FIG. 4 is a cross-sectional view showing still another operation state of the disc clamp mechanism.

FIG. 5 is a sectional view showing still another operation state of the disc clamp mechanism.

FIG. 6 is a sectional view showing still another operation state of the disc clamp mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spindle motor rotation shaft 2 Boss 3 Turntable 4 Disk guide member, 4a projection 5 Compression coil spring 6 Metal plate 7 Screw 8 Optical disk 9 Clamp member holding part 10 Guide member 11 Upper plate 12 Screw 13 Clamp member, 13a Claw 14 Compression coil Spring 15 Ball 16 Magnet 17 Yoke 18 Compression coil spring 19 Stepped screw 20 Clamper elevating member

Claims (1)

(57) [Claims] 1. A turntable fixed to a spindle motor, a disc guide member urged upward by a spring with respect to the turntable, a member to be suctioned provided on the turntable, and a vertically movable member above and below the turntable. A clamp member for pressing the disc against the turntable, a clamp member holding portion for vertically holding the clamp member, and a clamp member disposed between the clamp member holding portion and the clamp member. When a thick disk is clamped in a disk clamping mechanism of an optical disk device including a spring for urging the disk downward, and a suction member provided on the clamp member holding portion to suction the member to be suctioned, the disk guide member is Fit the center hole and push the disc upward, clamp member and clamp part When the suction member and the sucked member approach each other and the suction member approaches, the suction force of the suction member is applied to the disk, and when clamping a thin disk, the suction member descends until the suction member comes into contact with the sucked member. A disk clamp mechanism wherein a member is depressed to separate from the disk, and the clamp member is further separated from the clamp member holding portion to apply elasticity of a spring for urging the clamp member to the disk.