JP2935394B2 - Centering device for disc players - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centering device for a disk player, and more particularly, to a double-sided disk in which two single-sided disks having information recorded on one side thereof are bonded together so that the information side is on the upper side and the lower side. In the case of a double-sided disc player that rotates around the center hole of the upper surface (so-called B surface) and the lower surface (so-called A surface) of the disc, the disc player is centered by the center hole on the disc to be reproduced. Centering device.

[0002]

2. Description of the Related Art As a conventional disk player for reproducing, for example, a double-sided disk, a disk is sandwiched between a turntable and a clamper to reliably transmit the rotation of the turntable to the disk and to transmit a signal from the disk. The pickup to be played back is to play back the bottom (A side),
It is arranged to be located under the disk.

When the reproduction of the lower side of the disk is completed, the pickup moves to the upper side of the disk and reproduces the upper surface (side B) of the disk, but reproduces the lower surface. In this case, the center hole of the lower single-sided disk is centered by the lower-side centering member.
The center hole of the upper single-sided disk is centered by the upper centering member.

The lower centering member is provided on a turntable, while the upper centering member is provided on a clamper. The upper centering member and the lower centering member are pressed against each other by a magnet and can be moved up and down by a spring. It has been done. Conventionally, which side of the disc is to be centered is determined by the degree of depression of the clamper, that is, by raising and lowering the upper centering member or the lower centering member.

[0005]

As a conventional centering device for a double-sided disc player, the reproducing side of the double-sided disc depends on which of the lower side (A side) and the upper side (B side) is to be reproduced. Whether the centering of the disk is performed is determined by the degree of pressing of the clamper pressing member that presses the clamper as described above.

Therefore, a chucking member and a clamper mechanism interposed between a clamper and a clamper pressing member for pressing the clamper are complicated, and the pressing amount of the clamper pressing member is required to be precise. In addition, the upper and lower centering mechanisms and clamping mechanisms are not only complicated and expensive, but also lack reliability.

The present invention has been made in view of such a conventional problem, and has a lower centering member fixed to a disk motor shaft so that a turntable can be rotated up and down via a cam of the lower centering member. By using the fact that the rotation of the turntable is reversed between the case of reproducing the upper surface and the case of reproducing the lower surface, centering is performed by the center hole on the reproducing side, thereby simplifying the configuration. Another object of the present invention is to provide an inexpensive double-sided disc player centering device.

[0008]

SUMMARY OF THE INVENTION The present invention provides a turntable on which a double-sided disk is mounted and which can be rotated and lowered, and a turntable which is fixed to a motor shaft and is engaged with a guide member formed inside the turntable. A lower surface centering member having a cam for raising and lowering the turntable in accordance with the rotation direction of the turntable; a clamper for rotating the double-sided disk with the turntable interposed therebetween; And an upper surface centering portion for centering the center hole of the upper disk.

[0009]

The centering device for a disk player according to the present invention, when playing back the lower surface side of a double-sided disk and playing back the upper surface side, rotates the turntable in the opposite direction. When the rotating guide member slides the cam of the lower surface centering member, raises and lowers the turntable according to the sliding direction, and raises and lowers the double-sided disk on the turntable with the raising and lowering. When the member engages with the center hole of the upper disk and descends, the lower surface centering member engages with the center hole of the lower disk to perform centering.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 6 are views showing a centering device 100 for a double-sided disc player according to the present invention. First, the configuration will be described. 1 to 3, a spindle (motor shaft) 2 of a disk motor 1 has a bottom centering member 4 attached thereto.
Is fixed, and an annular turntable 3 is provided outside the lower surface centering member 4. The turntable 3 has a double-sided disk A mounted on the upper surface thereof, and is provided so as to rotate the double-sided disk A and fit on the spindle 2 so as to be rotatable up and down.

The lower surface centering member 4 has a sloping cam 5 formed on a boss 4a fixed to the spindle 2, and the sloping cam 5 has a guide member formed on the inner surface side of the turntable 3 as a guide member. Pin 6 is inserted. The guide pin 6 is engaged with the lower surface centering member 4 between the upper end 5a and the lower end 5b of the inclined cam 5. For this reason, the rotation of the spindle 2 is transmitted to the turntable 3 via the lower surface centering member 4 and the guide pin 6. The lower surface centering member 4 rotates in accordance with the rotation of the disk motor 1, and the guide pin 6 of the turntable 3 engages with the lower end 5 a of the inclined cam 5 to lower the turntable 3. For this reason, the lower surface centering member 4 is fitted into the center hole of the lower disk of the double-sided disk A to center the lower disk.

After the disk A is mounted on the turntable 3, the upper surface centering member 8 descending with the lowering of the pressing member 7 has a fitting hole 8 for fitting to the spindle 2.
a is formed, and a clamper 10 is provided via a spring 9. Upper surface centering member 8 is pressed member 7
When the clamper 10 descends, the clamper 10 is pressed against the double-sided disc A by the urging force of the spring 9.

A pin 10a protruding from the clamper 10 is inserted into a hole of the upper surface centering member 8, and the clamper 10 rotates together with the upper surface centering member 8, and a claw 10b of the clamper 10 and a claw of the upper surface centering member 8 are provided. 8
b, the clamper 10 and the upper surface centering member 8 are separated from each other by a certain distance or more.
0 is prevented from falling off.

Next, the operation will be described. When the double-sided disk A is mounted on the turntable 3, the pressing member 7 retracted from the turntable 3 descends, and the clamper 10 It is pressed onto the double-sided disc A by the urging force of the spring 9, and the turntable 3 and the clamper 1
The double-sided disc A is sandwiched between 0 and 0.

When the lower disk of the double-sided disk A is reproduced, the lower surface centering member 4 rotates with the rotation of the disk motor 1 and the turntable 3 has not yet rotated. The guide pin 6 is guided by the inclined cam 5 of the lower surface centering member 4, and as shown in FIGS.
And the lower surface of the double-sided disk A is centered by the lower surface centering member 4.

After the centering of the lower disk by the downward movement of the turntable 3 is completed, the guide pin 6 reaches the lower end 5a of the slope cam 5 as shown in FIG. The lower surface centering member 4 rotates together with the turntable 3 so as to rotate the double-sided disk A sandwiched between the turntable 3 and the clamper 10 to reproduce the lower disk. Is performed.

When the upper disk of the double-sided disk A is to be reproduced, the lower centering member 4 rotates in the opposite direction, so that the rotation of the turntable 3 with respect to the lower centering member 4 is reversed. The guide pin 6 of the turntable 3 is connected to the slope cam 5 in FIG.
As shown in FIG. 6, it moves to the upper end 5b of the slope cam 5.

Therefore, the turntable 3 is raised,
With this rise, the double-sided disc A on the turntable 3
Rises and comes into contact with the upper surface centering member 8, and the centering of the upper surface centering member 8 with respect to the center hole of the upper disk is performed.

Thereafter, the guide pin 6 of the turntable 3 contacts the upper end 5b of the inclined cam 5 to transmit the rotation to the turntable 3 in the same manner as described above, so that the lower surface centering member 4 rotates in the reverse direction. Then, the double-sided disc A also rotates in the reverse direction, and the upper disc is reproduced.

Thus, the centering device of this double-sided disc player utilizes the fact that the rotation of the turntable 3 is reversed between the reproduction of the upper surface and the reproduction of the lower surface, whereby centering is performed by the centering member on the reproduction side. It is.

Further, according to the present invention, the disc A rises from the lower surface (surface A) of the double-sided disk A to the side away from the motor 1 during reproduction from the upper surface (surface B). In order to prevent the lens of the pickup from contacting the disk A when moving to the surface, the pickup is separated from the disk A. However, this is not necessary, and the lens separation mechanism can be eliminated.

[0022]

As described above, according to the present invention,
Centering is performed by the center hole on the side to be reproduced with respect to the displacement of the center hole when the double-sided disks are bonded by bonding, and the problems caused by centering the center hole on the other surface are solved.

The centering by the center hole on the reproducing side utilizes the fact that the rotating direction of the double-sided disc is reversed depending on the reproducing side, so that the lowering centering member is moved up and down to switch the centering side. It is possible to eliminate the lens separation mechanism, simplify the switching mechanism, and obtain an inexpensive and highly reliable centering device for a double-sided disc player.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of a centering device of a double-sided disc player according to the present invention, in which a left side shows a state at the time of lower surface reproduction and a right side shows a state at the time of upper surface reproduction.

FIG. 2 is a partially cutaway side view of the embodiment shown in FIG. 1 when the turntable is lowered.

FIG. 3 is a partially cutaway side view of the embodiment shown in FIG. 1 when the turntable is raised.

FIG. 4 is a side view of the lower centering member of the embodiment shown in FIG. 1;

FIG. 5 is a developed view showing a relationship between a slope cam and a guide pin when the turntable of the embodiment shown in FIG. 1 is pushed down.

FIG. 6 is a development view showing a relationship between a slope cam and a guide pin in a state where the turntable of the embodiment shown in FIG. 1 is pushed up.

[Explanation of symbols]

 A Double-sided disc 2 Motor shaft 3 Turntable 4 Lower centering member 5 Slope cam 6 Guide pin (guide member) 8 Upper centering member 10 Clamper

Claims (1)

(57) [Claims] 1. A turntable on which a double-sided disc is mounted and which can be rotated and lowered, and a turntable fixed to a motor shaft and engaged with a guide member formed inside the turntable in accordance with the rotation direction of the turntable. A lower surface centering member having a cam for raising and lowering the disk; a clamper for rotating the double-sided disk between the turntable and the turntable; and biasing the clamper toward the double-sided disk and centering the center hole of the disk above the double-sided disk. And a centering device for a disc player.