JP2506843B2 - Optical multi-disc player - Google Patents

Description

TECHNICAL FIELD The present invention relates to an optical multi-disc reproducing apparatus capable of reproducing a plurality of optical discs.

2. Description of the Related Art An example of a conventional optical multi-disk reproducing apparatus will be described with reference to FIG. 6 is a mechanism, 7 is a motor for driving the mechanism 6, 8 is a driving device for applying a driving voltage to the motor 7, and 9 is for turning the driving voltage ON-OFF or ON.
A control device that outputs a control signal for switching a voltage between high and low two potentials to the drive device 8. With such a structure, the mechanism 6
A disc (not shown) is loaded by stopping exactly at the specified position. As the means, the control device 9
In response to the control signal from the drive device 8, the drive device 8 lowers the drive voltage applied to the motor from a high potential to a low potential shortly before the specified stop position so that the motor is in a sufficiently constant speed state and the original stop position is maintained. The drive voltage was turned off and the motor was stopped.

Problems to be Solved by the Invention However, when the motor is in a constant speed state, if the load of the mechanism increases for some reason and exceeds the torque generated by the motor, the rotation of the motor is restricted and the mechanism stops. There was a point.

The present invention has been made in view of the above circumstances, and provides an optical multi-disk reproducing apparatus that has a simple structure and can operate normally without restraining the rotation of the motor even if the load of the mechanism increases. With the goal.

The present invention provides a mechanism for loading a plurality of optical discs, a motor for driving the mechanism, a drive device for applying a drive voltage to the motor, and a drive voltage ON-OF.
A control device that outputs a control signal to the drive device so that the F voltage is turned on or the ON voltage is switched between high and low potentials, and a load detection signal that automatically detects the change in the load of the mechanism and automatically switches the drive voltage to the motor. It has a load detection device for outputting to the drive device.

The present invention has the above-described configuration, by detecting an increase in the load of the mechanism by the load detection device and switching the drive voltage applied to the motor from the low potential to the high potential regardless of the control signal output by the control device. The torque generated by the motor can be increased, and the mechanism can operate normally without the rotation of the motor being restricted by the load.

Embodiment FIG. 1 is a block diagram showing an embodiment of the optical multi-disk reproducing apparatus of the present invention. In FIG. 1, 1 is a mechanism for loading a plurality of optical discs, 2
Is a motor that drives the mechanism 1, 4 is a drive device that applies a drive voltage to the motor 3, 3 is a load detection device that detects a change in the load of the mechanism and outputs a load detection signal to the drive device, 5 is a drive voltage that is turned on It is a control device that outputs a control signal to the drive device 4 so as to turn off or switch the ON voltage between high and low potentials.

When the drive device 4 applies a low voltage to the motor 2 by the control signal output from the control device 5 and the load of the mechanism 1 increases when the motor 2 is in the low speed state, the rotation speed of the motor 2 decreases. If the load of the mechanism 1 exceeds the torque of the motor 2 as it is, the rotation of the motor 2 is restricted and the mechanism 1 stops at an irregular position. Then, the load detection device 3 detects that the load of the mechanism has become equal to or greater than a preset value, and outputs the load detection device to the drive circuit 4. The drive circuit 4 preferentially switches the drive voltage applied to the motor 2 to a high potential regardless of the control signal. When the drive voltage is switched to the high voltage, the torque generated by the motor 2 increases and exceeds the load of the mechanism 1. As described above, the mechanism 1 can be normally driven without restraining the rotation of the motor 2, and when the load of the mechanism 1 decreases, the load detection circuit 3 turns off the output of the load detection signal. Therefore, the drive circuit 4 can continue the normal operation by applying the low-potential drive voltage determined by the control signal to the motor 2.

FIG. 2 shows another embodiment of the present invention. Load detection device 3
Is composed of resistors 31, 34, 35 and transistors 32, 33. The driving device 4 includes transistors 41, 42, 47, Zener diodes 43, 44, resistors 45, 46, and input terminals 48, 4
Composed of 9.

According to the above configuration, when the input terminal 48 is at a high level (hereinafter “H”), the transistors 47 and 41 are OFF, and conversely, when the input terminal 48 is at a low level (hereinafter “L”), the transistors 47 and 41 are ON.
Then, a driving current flows through the resistor 31 and the transistor 41 to the motor 2. At this time, the drive voltage applied to the motor 2 by the controller 4 is determined by the state of the transistor 42, and the low potential is about V _Z43 −V _{BE41 The} high potential is about V _Z43.
It is + V _Z44 -V _BE41 . That is, when the input terminal 49 is "H", the transistor 42 is turned on, the Zener diode 44 is short-circuited, and the drive voltage becomes a constant potential.

If the input signal 48 is "L" and the input terminal 49 is "H" by the control signal output from the controller 5, the motor is rotating at a low speed. At this time, if the load of the mechanism 1 increases, the drive current flowing through the motor 2 increases and the voltage drop across the resistor 31 increases. When this voltage drop becomes approximately V _BE32 , the transistor 32 turns on. Then, the base current flows through the resistor 35 to the transistor 33, and the transistor 33 is turned on. As a result, the input terminal 49 is preferentially switched to "L" regardless of the control signal, and the drive voltage becomes high potential.

EFFECTS OF THE INVENTION As described above, according to the present invention, an optical multi-disk capable of operating normally without restraining the rotation of the motor even if the load on the mechanism increases due to the extremely simple structure. It is possible to provide a reproducing device, and it is extremely useful in practice.

[Brief description of drawings]

FIG. 1 is a block diagram of an optical multi-disk reproducing apparatus in one embodiment of the present invention, FIG. 2 is a circuit diagram of another embodiment of the present invention, and FIG. 3 is a block diagram of a conventional example. 1 ... Mechanism, 2 ... Motor, 3 ... Load detection device, 4 ... Drive device, 5 ... Control device.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yukio Morioka 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) Reference JP 62-226471 (JP, A) JP 62- 149043 (JP, A) Actually open 1-133351 (JP, U) Actually open 63-114457 (JP, U)

Claims (1)

(57) [Claims] 1. A mechanism for loading a plurality of optical discs, a motor for driving the mechanism, a drive device for applying a drive voltage to the motor, and a drive voltage for ON-
A control device that outputs a control signal to the drive device so as to turn it off or switch the ON voltage between a high potential and a low potential, and a change in the load of the mechanism is detected, and the drive voltage applied to the motor is independent of the control signal. An optical multi-disk reproducing device comprising a load detecting device for outputting a load detecting signal to be switched preferentially to the driving device.