JP2002288908A - Disk recording/reproducing device provided with clamper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a strong clamping force when a disk is clamped but a weak absorbing force between a turntable and a clamper when the disk is not mounted on the turntable. SOLUTION: A spring piece 4 is projected from a clamper 5 toward a turntable 3 and a bending deformation amount when the spring piece 4 touches the turntable 3 is set smaller than the thickness of a disk 6. The spring piece 4 is not abutted on the turntable 3 in a state where the disk 6 is held between the clamper 5 and the turntable 3, and presses the clamper 5 to move away from the turntable 3 in a state where the clamper 5 is directly abutted on the turntable 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk recording or reproducing apparatus provided with a clamper for holding a disk between a turntable and the disk.

[0002]

2. Description of the Related Art FIGS. 6, 7 and 8 are sectional side views of a conventional disk recording or reproducing apparatus. A turntable (3) on which a disk (6) is mounted and rotated is provided in connection with a motor (M) on a vertically movable chassis (1), and a pickup is provided for the turntable (3). (7) is provided so as to be able to approach and separate. The disc (6) has a hole (61) in the center and the turntable (3) has a disc (61).
(6) and a center hole (6) of the disc (6).
It has a fitting piece (32) that fits in 1). A clamper (5) is rotatably fitted to a top plate (2) provided above the chassis (1) and can be moved up and down by a small amount, and a magnet (50) is built in the clamper (5). ing. Turntable
In (3), a metal piece (30) to be attracted to the magnet (50) is built in, the chassis (1) is raised, and the turntable (3) and the clamper (5) are attracted to each other by magnetic force. As shown in FIG. 8, the disc (6) on the turntable (3) is
When the motor (M) is rotated while being held between the turntable (3) and the clamper (5), the disk (6) is rotated without falling off the turntable (3).
The motor shaft (60) fits into the center hole (53) of the clamper (5), and the clamper (5) rotates concentrically with the turntable (3).

The force for clamping the disk (6) is inversely proportional to the square of the vertical distance between the magnet (50) and the metal piece (30).
(See graph in FIG. 9). Disc on turntable (3)
When the clamper (5) and the turntable (3) are fitted together when the (6) is not mounted, the magnet (50) and the metal piece (3)
The vertical distance from (0) is Y1 in FIG. 7, and the clamping force at this time is Fmg1. Disc on turntable (3)
When (6) is placed, as shown in FIG. 8, the vertical distance between the magnet (50) and the metal piece (30) is Y2 larger than Y1, and the clamping force is Fmg2 smaller than Fmg1.
Becomes

[0004]

However, the disk (6)
When clamping the disc (6), it is desirable that the clamping force is strong because the disc (6) can be firmly held. When the disc (6) is not placed on the turntable (3), the lower the suction force between the turntable (3) and the clamper (5), the lower the chassis (1) and the lower the turntable.
The load for releasing the suction of (3) and the clamper (5) is reduced, which is convenient. In other words, it is ideal that Fmg1 is equal to Fmg2 or smaller than Fmg2. However, in the conventional clamper (5) and turntable (3), the clamping state of the ideal disk (6) is reversed. I was SUMMARY OF THE INVENTION It is an object of the present invention to set a high clamping force at the time of disk clamping and a low suction force between the turntable and the clamper when the disk is not placed on the turntable.

[0005]

From the clamper (5), a spring body to be brought into contact with the fitting piece (32) of the turntable (3) protrudes, and the amount of bending deformation of the spring body is determined by the thickness of the disk (6). The spring body is formed smaller than the disk (6) by the clamper (5).
The clamper (5) and the turntable (3) are not in contact with the turntable (3) while being sandwiched between the turntable (3) and the turntable (3).
With the (3) in direct contact, the clamper (5) is urged away from the turntable (3).

[0006]

[Operation and effect] When the disc is on the turntable
The combined clamper (5) is separated from the turntable (3) by the thickness of the disk (6), and the spring body is not in contact with the fitting piece (32) of the turntable (3). The biasing force of the spring body is not applied to the clamper (5). When the disc is not on the turntable, the spring body bends in contact with the fitting piece (32) of the turntable (3) and urges the clamper (5) in a direction to separate it from the turntable (3). The attraction force of the turntable (3) and the clamper (5) is a value obtained by subtracting the biasing force of the spring body from the attraction force by the magnetic force. This allows the turntable (3) and clamper
The suction force of (5) can be equal to or smaller than the case where the disc (6) is placed on the turntable (3), and an ideal disc (6) clamping state can be achieved. .

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an example of the present invention will be described in detail with reference to the drawings. 1 to 3 are cross-sectional side views of a disk recording or reproducing apparatus according to the present invention. Turntable
Chassis equipped with (3) and pickup (7)
The point (1) is provided so as to be able to move up and down, and the point that the turntable (3) is fitted to the clamper (5) on the top plate (2) is the same as the conventional one. The clamper (5) includes a holding plate (51) and a synthetic resin bracket (52) suspended from the holding plate (51), and the magnet (50) is built in the bracket (52). bracket
The thickness of (52) is slightly thicker than the top plate (2), and the clamper (5) is provided so as to be able to move up and down by the difference in thickness between the bracket (52) and the top plate (2). The fitting piece (32) of the turntable (3)
A metal piece (30) that is attracted to the magnet (50) is provided.
Hold (6). In addition, a magnet is attached to the turntable (3).
(50) may be provided with a metal piece (30) on the clamper (5).

In this embodiment, as shown in FIG. 1, a spring piece is provided from the center of the bottom surface of the bracket (52) of the clamper (5).
(4) is projected toward the fitting piece (32) of the turntable (3). The spring piece (4) is formed of a synthetic resin integrally with the bracket (52), thereby reducing manufacturing costs. As shown in FIG. 3, when the disc (6) is not placed on the turntable (3) and the outer periphery of the bottom surface of the clamper (5) and the receiving piece (31) of the turntable (3) are fitted together. The spring piece 4 is bent in contact with the fitting piece 32, and the vertical length at which the spring piece 4 is bent and deformed is formed smaller than the thickness of the disk 6.

In the following, the clamper (5) is a turntable (3)
The disk (6) turns the turntable
A description will be given separately of a case where the device is mounted on (3) and a case where the device is not mounted. Disk (6) rests on turntable (3)
When the lower surface of the bracket (52) is a disc as shown in FIG.
The holding plate (51) comes up from the top plate (2) in contact with the upper surface of (6). The clamper (5) is separated from the receiving piece (31) of the turntable (3) by the thickness of the disk (6). The amount of deformation that the spring piece (4) bends when it comes into contact with the fitting piece (32) is equal to the disc (6).
Is smaller than the thickness of the disk, so that the clamper (5)
The spring piece (4) does not contact the fitting piece (32) of the turntable (3). Clamper (5)
Does not receive the biasing force of the spring piece (4). Magnet (50)
The vertical distance between the metal piece and the metal piece (30) is Y2, and the clamping force at this time is Fmg2.

[0010] The disk (6) is mounted on the turntable (3).
When not placed, as shown in FIG. 3, the vertical distance between the magnet (50) and the metal piece (30) becomes Y1 smaller than Y2, and the attraction force by the magnetic force becomes larger than Fmg2. However, the spring piece (4) is bent in contact with the fitting piece (32) of the turntable (3), and
(5) is urged in a direction to pull it away from the turntable (3). Accordingly, the attraction force Fmg1 of the turntable (3) and the clamper (5) is a value obtained by subtracting the urging force Fb of the spring piece (4) from the attraction force by the magnetic force. This allows the turntable
The suction force of (3) and the clamper (5) can be made equal or smaller than the case where the disc (6) is placed on the turntable (3), and the ideal disc (6) A clamping state can be achieved.

In the above, the spring piece is attached to the clamper (5).
(4) is provided, but as shown in FIGS. 4 and 5, a spring piece is provided on the outer or inner circumference of the fitting piece (32) of the turntable (3).
(4) may be provided. In this case, the spring piece (4) may be made of metal or synthetic resin.

The description of the above embodiments is for the purpose of illustrating the present invention and should not be construed as limiting the invention described in the appended claims or reducing the scope thereof. Further, the configuration of each part of the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made within the technical scope described in the claims.

[Brief description of the drawings]

FIG. 1 is a sectional side view of a disc recording or reproducing apparatus.

FIG. 2 is a sectional side view showing a state where a disk placed on a turntable is clamped.

FIG. 3 is a cross-sectional side view showing a state where a turntable on which no disk is mounted and a clamper are fitted together.

FIG. 4 is a side view of a turntable provided with a spring piece.

FIG. 5 is a side view of a turntable provided with a spring piece.

FIG. 6 is a sectional side view of a conventional disk recording or reproducing apparatus.

FIG. 7 is a cross-sectional side view showing a state where a turntable on which no disk is mounted and a conventional clamper are combined.

FIG. 8 is a sectional side view showing a state where a disk placed on the turntable is clamped.

FIG. 9 is a graph showing the vertical distance between the magnet and the metal piece on the horizontal axis, and the attraction force between the clamper and the turntable on the vertical axis.

[Explanation of symbols]

Claims (2)

[Claims] A turntable (3) for rotating a disk (6) and a clamper (5) for holding the disk (6) by magnetically attracting the turntable (3), the turntable (3) comprising: A receiving piece (31) for supporting the disk (6),
In a disc recording or reproducing apparatus having a fitting piece (32) fitted in a center hole (61) of a disc (6), a fitting piece (32) of a turntable (3) is provided from a clamper (5).
The spring body to be brought into contact with the projection protrudes, and the amount of bending deformation when the spring body comes into contact with the fitting piece (32) is formed smaller than the thickness of the disc (6). When the clamper (5) and the turntable (3) are in direct contact with the turntable (3) without being in contact with the turntable (3) while being clamped between the turntable (3) and the clamper (5), A disc recording or reproducing apparatus characterized in that it is urged away from the turntable (3). 2. A turntable (3) for rotating a disk (6), and a clamper (5) for holding the disk (6) by being attracted to the turntable (3) by a magnetic force. A receiving piece (31) for supporting the disk (6),
In a disc recording or reproducing apparatus having a fitting piece (32) fitted in a center hole (61) of a disc (6), a turntable is provided.
A spring body to be in contact with the clamper (5) protrudes from the fitting piece (32) of (3), and the amount of bending deformation when the spring body contacts the clamper (5) is larger than the thickness of the disk (6). The spring body is formed small and does not abut on the clamper (5) in a state where the disc (6) is sandwiched between the clamper (5) and the turntable (3).
A disk recording or reproducing apparatus characterized in that the clamper (5) is urged away from the turntable (3) in a state where the clamper (5) and the turntable (3) are in direct contact with each other.