JP2538620Y2 - Loading drive circuit of optical disk player - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk loading apparatus for an optical disk player, and more particularly to a loading drive circuit for driving a loading motor.

[0002]

2. Description of the Related Art FIG. 2 shows an example of a conventional optical disk loading apparatus for an optical disk player. A disk tray 2 on which an optical disk is placed is supported so as to be able to enter and exit from the optical disk player main body 1, and is driven by a loading motor 3.

A switch 9 is provided so that the disc tray 2 operates at the end of the stroke in which the disc tray 2 protrudes from the optical disc player main body 1.
Is input to The tray open signal of the controller 8 turns on the switch 6 and the tray close signal turns on the switch 7.
Is turned on. A switch that operates at the end of the stroke when the disc tray 2 enters the optical disc player main body 1 is not shown.

When the switch 6 is turned on, a positive voltage is applied to the input of the amplifier 5, and when the switch 7 is turned on, a negative voltage is applied to the input of the amplifier 5. When a + or-voltage is applied to the input, the amplifier 5
The current is supplied or absorbed to the loading motor 3 via the. The loading motor 3 rotates forward or reverse depending on the direction of the supplied current. The switch 4 is turned off by the signal when the switch 9 is turned on.

[0005] In the above-described configuration, when the disc tray 2 is in the optical disc player main body 1 and the controller 8
Outputs a tray open signal, the switch 6 is turned on, and the amplifier 5 supplies a current to the loading motor 3 via the switch 4.

[0006] The loading motor 3 rotates forward and causes the disc tray 2 to protrude from the optical disc player main body 1.
At the end of the stroke, switch 9 turns on and switch 4
Turns off. Further, an ON signal of the switch 9 is input to the controller 8, and the output of the tray open signal is stopped.

As described above, the disc tray 2 is stopped while projecting from the optical disc player main body 1. When the optical disc is replaced and the disc tray is pushed in by hand, the switch 9 is turned off, and the controller detecting the switch 9 is turned off. Reference numeral 8 outputs a tray close signal, rotates the loading motor 3 in the reverse direction, and sends the disc tray 2 into the optical disc player main body 1.

The end of the process of moving the disc tray 2 into the optical disc player main body 1 is detected by a switch (not shown), and the controller 8 stops outputting the tray close signal.

When the disc tray 2 is pushed in by hand, the loading motor 3 is rotated to generate an electromotive force. However, since the switch 4 is turned off, no current flows and the torque for rotating the loading motor 3 is small and the disc tray is rotated. Can be pushed lightly.

[0010]

[Problems to be Solved by the Invention] In the above-mentioned conventional device, when the disc tray 2 is pushed in by hand,
Since the switch 4 for disconnecting the connection between the amplifier 5 and the loading motor 3 is provided so that the disc tray 2 operates lightly, an expensive relay or a complicated electronic switch is required, and there is a problem that the cost of parts and assembly increases. Was.

The present invention has been made in view of the above points, and has as its object the loading of an optical disk player in which the cost of parts and assembly is low and the disk tray can be pushed lightly by hand. It is to provide a drive circuit.

[0012]

The loading drive circuit of the optical disk player according to the present invention comprises a loading motor for moving a disk tray loaded with a disk into and out of the apparatus main body, and a means for detecting the end of the disk tray projecting stroke. In the apparatus, the loading motor and its drive circuit are connected via a parallel circuit in which diodes are connected in opposite directions.

[0013]

According to the loading drive circuit of the optical disk player of the present invention, the motor drive circuit can supply a bidirectional current to the loading motor via the diode parallel circuit to rotate the loading motor forward and backward.

When the disc tray is pushed in by hand, the loading motor rotates to generate an electromotive force. However, the initial rotation speed of the loading motor until the movement of the loading motor is detected by the detecting means is small, and the electromotive force is also small. The electromotive force is smaller than the forward voltage drop of the diode, so that no current flows and the driving torque of the loading motor is small. Therefore, the disc tray can be pushed lightly by hand.

When the movement of the disk tray is detected by the detecting means, a loading motor is driven by a drive circuit as in a conventional disk loading device, and the disk tray is fed into the apparatus main body by the loading motor.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A loading drive circuit of an optical disk player according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1A is a block diagram showing an embodiment of the present invention. In FIG. 1A, parts having the same functions as those shown in the conventional example of FIG. 2 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the circuit of FIG. 1A, a parallel circuit 10 in which diodes 10a and 10a are connected in opposite directions is connected instead of the switch 4 of the circuit shown in FIG. 2, and the other configuration is that of FIG. Is the same as

In the above configuration, the amplifier 5 can supply bidirectional current to the loading motor 3 via the diode parallel circuit 10 to rotate the loading motor 3 forward and backward.

When pushing the disc tray 2 by hand,
Although the loading motor 3 rotates to generate an electromotive force, the initial rotation speed of the loading motor 3 until the movement of the disk tray 2 is detected by the switch 9 is small, and the electromotive force is also small. Therefore, the electromotive force is smaller than the forward voltage drop of the diode 10a, so that no current flows and the driving torque of the loading motor is small. Therefore, the disc tray can be pushed lightly by hand.

When the operation of the loading motor is detected by the switch 9, the controller 8 outputs a tray close signal, rotates the loading motor 3 in the reverse direction, and sends the disk tray 2 into the optical disk player body 1.

The end of the travel of the disk tray 2 into the optical disk player body 1 is detected by a switch (not shown), and the controller 8 stops outputting the tray close signal.

FIG. 1B shows a modification of the embodiment shown in FIG. 1A. In this example, a parallel circuit in which two diodes 10a are connected in series and are opposite to each other is shown in FIG. Is used in place of the parallel circuit 10.

FIG. 1C shows another modification of the embodiment shown in FIG. 1A. In this embodiment, a parallel circuit in which zener diodes 10b are connected in opposite directions is shown in FIG.
It is used instead of the parallel circuit 10 of FIG.

As shown in the above modification, it is possible to set the forward voltage drop of the diode to match the electromotive force of the loading motor.

[0025]

According to the loading drive circuit of the optical disk player of the present invention, the disk tray can be lightly pushed by hand without using an expensive relay or a complicated electronic switch circuit.

[Brief description of the drawings]

FIG. 1A is a block diagram showing a loading drive circuit of an optical disc player according to an embodiment of the present invention; FIG. 1B is a partial circuit diagram showing a modification of the embodiment;
FIG. 1C is a partial circuit diagram showing another modification of the embodiment.

FIG. 2 is a block diagram showing an example of a loading drive circuit of a conventional optical disc player.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical disk player main body 2 Disk tray 3 Loading motor 4 Switch 5 Amplifier 6 Switch 7 Switch 8 Controller 9 Switch 10 Diode parallel circuit

Claims (1)

(57) [Scope of request for utility model registration] 1. A disc loading apparatus comprising: a loading motor for moving a disc tray on which a disc is loaded from a main body of the apparatus into and out; and means for detecting the end of the protruding stroke of the disc tray. A loading drive circuit for an optical disc player, wherein the loading drive circuit is connected via a parallel circuit connected in a reverse direction.