JPH03260952A - Disk player - Google Patents

Abstract

PURPOSE:To position a disk with high accuracy by shifting a reference for positioning the disk once to the side of a turntable and holding it finally at the time of holding the disk. CONSTITUTION:When the disk 60 is fed to a set position to the turntable 20, a mode plate 50 is moved to a play position to make a clamper 30 operate to hold the disk 60. Afterward, the mode plate 50 is slightly brought back toward a loading position based on a signal from a control circuit 90. By this method, the holding of the disk 60 by the clamper 30 is once released, and a disk positioning member is moved from the clamper 30 to the turntable 20. Subsequently, the disk 60 is finally held between the clamper 30 and the turntable 20 by moving the mode plate 50 to the play position again.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a player for recording or recording discs.

[Conventional technology]

Conventionally, in this type of disc player, except for top-loading types, when loading the disc, the disc is fed to a set position relative to the turntable (a position where the centers of both coincide), and then a clamper clamps the disc between it and the turntable. It operates as follows and enters the hold state. In other words, the clamper first touches the disc that has been fed to the set position with respect to the turntable.

[Problem to be solved by the invention]

At the time when the clamper touches the disk, the disk is not yet accurately positioned with respect to the rotation center of the turntable. Therefore, if the disc is held as it is, no matter how high the positioning accuracy of the turntable is, it will be affected by the restraining force of the clamper, and the disc positioning accuracy will decrease.

A technical problem of the present invention is to provide a disc player that can position the disc with high precision by first moving the positioning reference to the turntable side when holding the disc and then finally holding the disc.

[Means to solve the problem]

In order to solve the above problems, the disc player of the present invention is configured as follows.

In other words, in a type of disc player in which the disc is fed to a set position relative to the turntable during loading, and then a clamper operates to clamp and hold the disc between it and the turntable, a predetermined drive source moves the disc to the loading position and plays the disc. a mode plate that moves back and forth between the play position and the play position to move the clamper to the disc hold position;
A control circuit is provided for outputting a signal to the drive source so as to return the mode plate, which has reached the play position, toward the loading position before the disc is finally held by the clamper.

[For production]

According to the configuration, when the disc is fed to a set position relative to the turntable, the mode plate moves to the play position and the clamper operates to hold the disc. Thereafter, the mode plate is returned a little toward the loading position based on a signal from the control circuit. As a result, the hold of the disc by the clamper is once released, and the disc positioning reference member is moved from the clamper to the turntable.

Subsequently, the mode plate is moved to the play position again, so that the disc is finally held between the clamper and the turntable.

〔Example〕

Next, one embodiment of the present invention will be described with reference to the drawings. In the following embodiments, the present invention is applied to a player for compact discs or single compact discs.

- Figure 1 shows a side view of the disc player immediately after loading. In this Figure 1, frame 1
The traverse plate 10 is supported by a plurality of dampers (not shown) for blocking vibration transmission. The traverse plate 10 is provided with a turntable 20 and a motor 22 for driving the turntable 20. A spindle 20a concentric with the rotation axis of the turntable 20 protrudes from the upper surface of the turntable 20 so as to be fitable into the center hole 62 of the disk 60. The disk 60 is positioned with respect to the turntable 20 by fitting the center hole 62 of the disk 60 into the spindle 20a.

The traverse plate 10 has a support portion 12 bent upward in the drawing at a location on the left side of the drawing.

A base end portion of a clamper arm 32 is rotatably supported by a hinge pin 34 on this support portion 12 . The clamper 30 constituted by the clamper arm 32 and a clamper disk 44, which will be described later, functions to press and hold the disk 60 against the turntable 20.

The clamper arm 32 is integrally formed with a protrusion 36 extending downward in FIG. 1 from a location near the hinge pin 34. This protrusion 36 and the traverse plate 1
0, a tension spring 38 is applied. Due to the elastic force of the spring 38, the clamper arm 32 is constantly urged in the clockwise direction in FIG.

A shaft 46 is fixed to the center of the clamper disk 44. The clamper disk 44 is located on the inner surface of the clamper arm 32 (the lower surface in FIG. 1), and
6 is inserted into the clamper arm 32 in the vertical direction, and is prevented from being removed. Note that the shaft 46 is loosely inserted into the clamper arm 32, so that the inclination of the axis and the movement in the axial direction are respectively possible within certain limits.

When the clamper arm 32 performs a holding operation using the hinge pin 34 as a pivot point, the clamper disc 44
The lower surface of the disc 60 contacts the upper surface of the outer periphery of the center hole 62 of the disc 60 and presses the disc 60 against the turntable 20 side.

Also, at this time, due to contact between the mutual tapered cone surfaces (not shown) of the clamper disk 44 and the spindle 20a, the turntable 20 and the clamper disk 4
Centering with 4 is performed.

A roller retainer 70 is attached to a hinge pin 72 on the feeding side (right side in the drawing) of the disk 60 in the frame 1.
It is assembled so that it can rotate freely using the fulcrum. This roller retainer 70 is provided with rollers 76 for feeding the disk 60 toward the turntable 20 during loading. Further, a biasing force is applied to the roller retainer 70 in the direction of bringing the roller 76 into contact with the lower surface of the disk 60 during loading.

A large diameter gear 78 is fixed to the roller shaft 74 of the roller 76. This gear 78 is always engaged with a drive gear 82 of a step motor 80 fixed to the roller retainer 70.

A mode plate 50 is attached to the traverse plate 10 so as to be movable to the right from the position shown in FIG. 1 (loading position). When the loading (or unloading) of the disc 60 is completed, the mode plate 50 starts moving in conjunction with the rotation of the step motor 58, which is its drive source, and performs various mode switching functions required of the disc player. Fulfill.

On the side of the mode plate 50, a slope 52 for switching is formed at the upper edge in FIG. This slope 5
2 is in contact with a pin 40 fixed to the clamper arm 32 of the clamper 30. That is, this pin 40 is pressed against the slope 52 by the elastic force of the spring 38 acting on the clamper arm 32. Therefore, when mode plate 50 moves to the right from the loading position shown in FIG.
0 descends along the slope 52, and as a result, the clamper arm 32 rotates in the hold direction using the hinge pin 34 as a fulcrum.

Further, the mode plate 50 is provided with a window 54 for switching. One end of the roller shaft 74 of the roller retainer 70 is inserted into the window 54 .

When the mode plate 50 moves rightward from the loading position shown in FIG.
4 is pushed by the slope 55 of the window 54 and descends along this slope 55. That is, at this time, the roller retainer 70 rotates counterclockwise about the hinge pin 72, and the roller 76 separates from the lower surface of the disk 60.

In the disc player configured as described above, during loading, the roller 76 is in contact with the lower surface of the disc 60 and rotates in conjunction with the drive of the step motor 80. This causes the disk 60 to be fed to the set position relative to the turntable 20, as shown in FIG.

This is detected by a disk switch 85 using a photoelectric switch or the like. Drive of the motor 80 is stopped by a signal from this switch 85 directly or by an output signal from a control circuit 90 based thereon.

At the same time, the control circuit 90 outputs a signal to start normal rotation to the step motor 58 for the mode plate 50.

Due to the normal rotation of the motor 58, the mode plate 50
starts moving rightward from the loading position shown in FIG. As the mode plate 50 moves, the clamper arm 32 constituting the clamper 30 rotates in the hold direction about the hinge pin 34 as a pivot point, as described above. When the mode plate 50 is moved to the play position shown in FIG.
0 onto the turntable 20 and hold it.

Meanwhile, in parallel with the operation of the clamper 30, the roller retainer 70 also rotates about its hinge pin 72 as a fulcrum. When the mode plate 50 is moved to the play position, the roller 76 is held in a position separated from the lower surface of the disk 60, as shown in FIG.

Now, when the mode plate 50 reaches the play position, this is detected by a mode switch 86 using a photoelectric switch or the like. Based on the signal from the switch 86, the control circuit 90 outputs a signal to the step motor 58 for the mode plate 50, for example, to reverse the rotation for a predetermined period of time.

As a result, the mode plate 50 is returned by a predetermined stroke toward the loading position, as shown in FIG. As a result, the pin 40 of the clamper arm 32 constituting the clamper 30 is pushed up by the slope 52 of the mode plate 50, and the clamper arm 32 rotates in the original direction against the elastic force of the spring 38. Therefore, the clamper disk 44 is lifted from the disk 60 by a predetermined distance, and the clamper 30
The halt of the disk 60 due to this is released.

That is, the disk 60, which had been restrained by the clamper 30, becomes temporarily free from the clamper 30. As a result, the positioning reference member of the disc 60 is moved from the clamper 30 to the turntable 2.
It will be moved to 0. Therefore, the disk 60 is positioned with respect to the turntable 20 in a centered state in which the mutual centers of rotation coincide with each other with high precision.

Note that in the state shown in FIG. 3, the roller retainer 7
0 also rotates in the original direction using the hinge pin 72 as a fulcrum. However, the amount of rotation is restricted at the position where the roller shaft 74 contacts the holding surface 55a of the slope 55 in the window 54 of the mode plate 50. Therefore, even in the state shown in FIG. 3, the roller 76 is
It is away from the bottom surface of 0.

1 2 After this, from the control circuit 90 to the mode plate 50
A signal is output to cause the step motor 58 for normal rotation again. This causes the mode plate 50 to
Move the disc again to the play position shown in the diagram and
0 is finally held by the clamper 30 with high positioning accuracy. On the other hand, the roller retainer 70 is also held at the position shown in FIG. 2, where the roller 7G is sufficiently separated from the lower surface of the disk 60.

When the mode plate 50 reaches the play position again, a stop signal is output from the control circuit 90 to the step motor 58 in response to a signal from the mode switch 86, and a start signal is output to the motor 22 of the turntable 20. is output. As a result, the disc player is held in the state shown in FIG. 2 and play begins.

A microcomputer is used in the control circuit 90, and the contents of its software processing are shown in the flowchart of FIG. To explain the process according to this flowchart, first, in step St in FIG. 4, a signal from the disk switch 85 is input in response to the disk 60 being fed to the position of the turntable 20. Based on this,
In the next step S2, a normal rotation signal is output to the power supply circuit of the step motor 58 for the mode plate 50.

The process then proceeds to step S3, where it is determined based on the signal from the mode switch 86 whether the mode plate 50 is in the play position shown in FIG. If the determination in step S3 is NO, the process is repeated, and if the determination is YES, the process moves to step S4.

In this step S4, a reverse rotation signal is output to the power supply circuit of the motor 58. Then, in step S5, a timer for determining the reversal time of the motor 58 is turned on, and in the next step S6, the time required to move the mode plate 50 from the play position shown in FIG. 2 to the position shown in FIG. The progress is judged.

Before the time has elapsed, it is determined NO in step S6 and the process is repeated, and when the time has elapsed, it is determined YES and the process moves to step s7, where the normal rotation signal is output again to the power supply circuit of the motor 58. . Then step S
8, where it is again determined based on the signal from the mode switch 86 whether or not the mode plate 50 is in the play position.

If the determination in step S8 is NO, the process is repeated, and if the determination is YES, the process moves to step S9. In this step S9, a stop signal is output to the power supply circuit of the motor 58, and in the next step S10, a start signal is output to the motor 22 for the turntable 20.

This completes the process from the time when the loading of the disc 60 is completed to the start of play.

〔Effect of the invention〕

In this way, in the present invention, before the disc is finally held between the clamper and the turntable, the positioning reference for the disc is transferred from the clamper to the turntable, so that the disc is held on the turntable. Positioning is performed with high precision.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a side view showing the disc player when loading is completed, FIG. 2 is a side view with the disc held, and FIG. FIG. 4 is a side view of the device slightly moved back from the position shown in the figure to the position shown in FIG. 1, and FIG. 4 is a flowchart showing the contents of software processing by the microcomputer of the control circuit. 20... Turntable 30... Clamper 50... Mode plate 58... Drive source (step motor) 60... Disc 90... Control circuit

Claims (1)

[Claims] In a type of disc player in which a disc is fed to a set position relative to a turntable during loading, and then a clamper operates to clamp and hold the disc between it and the turntable, a predetermined driving source is provided. a mode plate that moves back and forth between a loading position and a play position, and moves the clamper to a disc hold position at the play position; and a mode plate that once reaches the play position before the disc is finally held by the clamper. a control circuit that outputs a signal to the drive source so as to return the mode plate to a loading position.