JPH0237123Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Background of the idea] The present invention relates to a disk player.

[Prior art and its disadvantages] There are various types of disc players, but
Normally, the pickup means such as a tone arm for tracing the signal track of the disk is
The structure is such that the disk is placed on the opposite side of the turntable on which the disk is placed, and the space in the height direction of the motor for rotating the turntable becomes a dead space, which hinders miniaturization of the device. It was coming.

Therefore, it is possible to trace the signal from the motor side to the disk, but in that case, the signal recording surface must be completely exposed, so the diameter of the turntable that is to be rotated by the motor must be recorded in the signal. It must be smaller than the diameter of the innermost circumference. In this case, since the disk and the turntable are in contact with each other at a portion where the rotational moment is small, the disk has the disadvantage that it tends to slide on the turntable due to the rotational force of the motor.

[Purpose of the invention] In order to eliminate the drawbacks of the conventional disk player, the present invention provides a pickup means on the motor side and traces a signal from the motor side, thereby reducing the dead space in the height direction of the motor. It is an object of the present invention to provide a disk player that can be used effectively and that allows a placed disk to be less likely to slide on a turntable.

[Summary of the invention] For this purpose, the invention provides a first turntable having a smaller diameter than the inner circumference of the signal track of the disk and on which a disk to be played is placed, and the first turntable. a second turntable that sandwiches the disk between the first turntable and is rotatably supported coaxially with the first turntable; A pickup means for traying signal tracks recorded on the disk is arranged on the motor side with respect to the disk, and the diameter of the second turntable is larger than the diameter of the first turntable. That is.

[Operation of the invention] The present invention sandwiches a disk between a first turntable having a diameter smaller than the inner circumference of the signal track of the disk and a second turntable having a larger diameter. Since the pick-up is placed on the same side as the motor that rotates the first turntable, it is possible to effectively utilize the dead space in the height direction of the motor. By bringing the turntable into contact with the disk during a relatively large portion of the rotational moment of the disk, it is possible to prevent the disk from slipping in the rotational direction.

[Embodiment of the invention] An embodiment of the invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of the present invention, with the top hood opened. In this figure, a direct drive type spindle motor 3 is provided inside a cabinet 1, and a first turntable 4 is coaxially arranged above the spindle motor 3. This first turntable is for supporting and rotating a disk (not shown), and its outer diameter is approximately equal to the central part of the disk where no signal track is formed, or at least has a smaller diameter. In this way, all of the signal tracks are exposed. Next, an upper surface hood 2 is provided above the cabinet 1 and can be opened and closed with respect to the cabinet 1, and a second turntable having a diameter larger than that of the first turntable is provided. . In the embodiment shown in FIG. 1, the diameter of the second turntable is approximately the same as the outer diameter of the disk. This second turntable is rotatably supported by a predetermined bearing means, and when the upper hood 2 is closed, its rotational axis is aligned with the rotational axis of the first turntable 4. It is provided. Further, a pickup means having a cartridge 7 is provided on the side of the first turntable 4 inside the cabinet 1, and is structured to trace the signal track on the lower surface side of the disk.
For this reason, the cartridge 7 is disposed with the stylus facing upward and is movable in the radial direction of the disk.

Since the disk player according to the present invention has the above-mentioned configuration, the pick-up means is placed on the same side of the disk as the motor, so the dead space in the height direction of the motor can be effectively utilized, and the overall external appearance of the device It is possible to downsize the disk to almost the same size as the disk diameter.

Next, how to use this player will be explained in more detail with reference to FIG. Figure 2 is the first
Place the disk 8 on the turntable 4 shown in the figure,
FIG. 2 is a partial side view with the upper hood 2 closed. As is clear from this figure, by closing the top hood 2, the disk 8 is held between the first turntable 4 and the second turntable 6. In this case, the second turntable 6 is attached to the bearing 9. Since the engagement state with the second turntable 6 is released and the spindle 5 is supported on the disk, there is no fear that any pressing force other than the weight of the second turntable 6 will be applied to the disk 8 and the first turntable 4. . At this time, since the second turntable contacts the disk at a portion where the moment is relatively large, there is less risk that the disk will slip on the second turntable in the rotational direction. Further, the spindle 5 protruding from the center of the first turntable 4 passes through the center hole of the disk and is received in the recess 10 formed at the center of the second turntable 6, so that the spindle 5 of the two turntables can be rotated. There is no fear that the center of motion will shift,
Excellent rotational performance can be maintained.

Furthermore, as for the pick-up means, the cartridge 7 is moved between the guide rails 12 and 12 as shown in this figure.
The signal track on the lower surface of the disk 8 is traced by being supported by a carriage 11 placed above. By using the linear tracking type structure in this manner, it is possible to prevent tracking errors from occurring and to construct a compact pickup means.

In the above embodiment, the diameter of the second turntable is approximately equal to the outer diameter of the disk, but in short, if the diameter of the second turntable is larger than that of the first turntable, it is natural that the disk It is clear that the frictional force between the disk and the disk can be increased and the slippage of the disk can be reduced.

The player in the above embodiment has a simple structure,
Although the device can be miniaturized and excellent performance can be obtained, providing the second turntable 6 on the upper surface of the disk is particularly effective for damping vibrations of the disk. That is, although the disk vibrates in the vertical direction as it rotates, since the diameter of the second turntable is larger than the diameter of the first turntable, it is not possible to achieve the effect of damping the antinode of the vibration. can. Further, since the second turntable 6 rotates integrally with the first turntable 4, there is an advantage that a sufficient moment of inertia can be obtained. Further, since the value of this moment of inertia increases according to the diameter of the turntable, a predetermined value can be obtained even when the second turntable is made lightweight.

In addition, since the method traces the underside of the disk, dust does not accumulate on the turntable and disk surface, which is extremely effective in improving the S/N ratio when playing the disk and simplifying maintenance. be. This also applies to the fact that the stylus of the cartridge is disposed on the upper side, making it easier to clean the stylus.

In the disc player according to the present invention, when playing a disc, the pick-up means is located below the disc and it is not appropriate to operate it manually, so it is preferable to operate the pick-up means automatically using an electronic circuit or the like. When the top hood 2 is open, it is desirable to hold the cartridge within a predetermined rest means and to protect the stylus portion using a predetermined protector.

In the above embodiment, a guide rail and a carriage supported by the guide rail are used as members for supporting the cartridge of the pick-up means, but it is obvious that a normal offset arm, linear tracking arm, etc. can be used. Even in that case, sufficient stylus pressure can be obtained by using a dynamic type arm.

[Effects of the invention] As described above, in the disk player according to the invention, by tracing the signal track from the same side of the disk as the motor, the dead space in the height direction of the motor can be effectively utilized. The second turntable, which has a larger diameter than the first turntable, reduces slippage in the rotational direction of the disk and also provides a stabilizer effect that dampens disk vibration, making it suitable for downsizing. A disk player with excellent rotational characteristics can be obtained.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of a disk player according to the present invention, and FIG. 2 is a side view of a portion of the apparatus shown in FIG. 1... Cabinet, 2... Top hood, 3...
...Spindle motor, 4...First turntable, 5...Spindle, 6...Second turntable, 7...Cartridge, 9...Bearing, 11...
...Carriage, 12...Guide rail.

Claims (1)

[Claims for Utility Model Registration] (1) A first turntable having a smaller diameter than the inner circumference of a signal track of the disk and on which a disk to be played is placed, and a rotary drive for said first turntable. a second turntable that holds the disk between the motor and the first turntable and is rotatably supported coaxially with the first turntable; A pickup means for tracing a signal track obtained by the turntable is arranged on the motor side with respect to the disk, and the diameter of the second turntable is larger than the diameter of the first turntable. player. (2) The utility model registration request is characterized in that the second turntable is rotatably supported by a hood that is provided to be openable and closable with respect to the cabinet in which the first turntable is arranged. A disk player according to scope 1.