JPS62143238A - Control system for optical disc device - Google Patents

Abstract

PURPOSE:To prevent the service life of a laser diode from being wasted by keeping the drive of a spindle motor and stopping the light emission of a laser drive when a controller judges it that an optical disc device is probably not in use. CONSTITUTION:As the criterion of the possibility in use at an operation possibility discriminating means 1, when a time exceeds a prescribed time after the optical disc device is released from the operating state, it is judged that the device is possibly not in used. A laser diode light control means 2 stops the light emission of the laser diode by using a signal being the result of no possibility of the operation by the means 1, sends a signal representing the emission stop state to an LD emission stop means 3, and the LD-off state is sent to an optical disc controller as, e.g., one of status signals. That is, the optical disc device is possible not in use by the controller, the emission of the laser diode is stopped to save the service life of the laser diode.

Description

[Detailed Description of the Invention] [Summary] In an optical disk device, when the optical disk control device does not use the device for more than a certain period of time, the spindle motor is kept rotating and the laser diode stops emitting light, and the control device stops the laser diode. This system is configured to notify when the laser diode has stopped emitting light, thereby preventing the life of the laser diode from being wasted and allowing it to be quickly restored when it is ready for use.

[Industrial Field of Application] The present invention relates to a control system for an optical disc device, and more particularly to light emission control of a laser diode for a light source used for 3D epsilon recording and writing of an optical disc.

Optical disk devices have a huge storage capacity, and although devices that can be rewritten have not yet been put into practical use, their use as human data files is gradually expanding.

No. 4-1 is a block diagram of main parts of the optical disc device.

The beam emitted from the laser is turned into parallel light by a collimation lens, passes through a polarizing beam splitter,
The light is reflected by a mirror and focused onto the recording layer of the optical disc by an objective lens.

The reflected light from the optical disk is reflected by the objective lens again by the IM remirror, reflected downward by the polarizing beam splitter, and by the half mirror, one side is reflected to the left and enters the high-frequency signal amplifier, and the other beam is transmitted downward. is detected by a 4-split photodetector and input to a position error signal processing circuit.

The output of the position error signal processing circuit is input to the focus and track servo, and the output performs fine adjustment of the objective lens.

The Whiscoil Morph (VCM) servo uses track selection data from the microprocessor to control the light output. The spindle servo receives feedback from the encoder and moves the spindle motor to the drive side. Tll.

FIG. 5 is a system configuration diagram of a system using an optical disk device.

Is the system mainly composed of a central processing unit (CPU) and a chabur device controlling the optical disk control device? Ill L
, Does the optical disk control 11 device control the optical disk device? 71
1 to read/write information.

[Prior art] In an optical disk device connected to a large-scale information processing system, even if an optical disk is set in the device, the power is turned on, and the device is ready for recording/playback, the system may not operate the device for a long time. May not be used.

In this case, the laser diode emits light with read power (the power in the tracking state and read state; it emits light with an even higher power pulse during writing), and the laser beam is in a tracking state! It's empty.

[Problems to be solved by the invention] As mentioned above, conventionally, when a system does not use an optical disk device for a long time, the lifespan of the laser diode, which is said to be approximately 3,000 hours, is wasted during this period. It was something that could be done.

The present invention aims to provide a new control method for an optical disc device that solves these problems.

[Means for Solving the Problems] FIG. 1 shows a principle block diagram of a control system for an optical disk device according to the present invention.

In the first part, 1 is a usability determination means, and 2
3 is a laser diode light emission control means, and 3 is a laser diode (LD) light emission stop state notification means.

The usability determining unit 1 determines that there is no possibility of use, for example, when the time elapsed since the optical disk device was released from use exceeds a certain period of time.

The laser diode light emission control means 2 stops the light emission of the laser diode according to the signal that the usability judgment means 1 determines that there is no possibility of use, and sends a signal indicating that the light emission has been stopped to the LD light emission stop means 3. , the fact that the LD is off is sent to the optical disk control device, for example, as one of the status signals.

[Operation] With the above configuration, when there is no possibility that the optical disc device will be used by the control device, the laser diode can stop emitting light, thereby saving the life of the laser diode.

Since the spindle motor is not stopped and continues to rotate, it is possible to quickly restore the state in which recording/reproduction is possible.

The control device is notified that the optical disk device has stopped emitting light, and when using the optical disk device whose light emission has stopped F, it first instructs the laser diode to emit light and then performs normal control.

[Example] The present invention will be described in more detail below with reference to Examples shown in FIGS. 2 and 3.

FIG. 2 is a block diagram of an embodiment of an optical disc device to which the present invention is applied.

In FIG. 2, numeral 11 is an OR gate, which performs the logical sum of the "attention" signal and the "select" signal.

The "attention" signal is an interrupt signal sent from the present device to the optical disc control device, and the "selected" signal is a signal indicating that the optical disc control device has selected the present device.

FIG. 3 is a time chart showing the timing of various control signals in the optical disc device.

Optical disk device is controlled by 'Select' of Jll device.
Raise the "Selectenoto" signal by signal.

When the 1-seek-1 signal comes from the control 11 device, it raises the ``Dry Drive 1 signal'' and starts the seek operation. When the seek operation is completed, it sends the ``Attention'' signal and
Drop the "Drive Busy" signal.

The controller learns from the "attention" signal that the sorter is complete, selects the device and sends a "read/write" signal to read or write.

Once the read or write is complete, the "selected" signal is also dropped.

Therefore, the "selected" signal and the "attention"
A certain period of time after both signals are dropped indicates that the optical disc device is not in use.

The explanation returns to FIG. 2 again.

12 is a N0TU path, which inverts the output of the OR gate 11 and inputs the output signal to the timer 13.

13 is a timer that counts clocks.

The output signal of the N O'l' circuit 12 is "attention"
When either the signal or the "SELECT" signal is rising, it becomes "0" and serves as a reset signal for the timer 13, and when neither signal is rising, it becomes "1".
This becomes the timer enable signal.

The timer 13 starts counting when neither the "attention" signal nor the "select" signal is raised, and issues a "carry" signal when it has counted the set number of times.

Reference numeral 14 denotes a timer time switching unit, which can arbitrarily change the setting of the time from when the timer 13 starts counting to when a carry is issued, such as 5 minutes, 10 minutes, or 30 minutes. The timer 13 can be set to 2 seconds to test the function, and the timer 13 can also be set to be incapable of counting so that the function can be stopped.

Reference numeral 21 denotes an LD light emission control section, which controls the laser diode to stop emitting light in response to a "carry" signal from timer I3.

31 is a status data creation unit for the control device,
Creates data that notifies the control device of various statuses of the device.

The status data generation unit 31 for the control device receives a signal from the LD light emission control unit 21 indicating whether the laser diode is in a light emitting state or a stopped state as part of various status information, and a track servo and a signal from the track/focus control unit 41. A focus servo status signal is input to control a predetermined bit of status data.

The state of the laser diode is held in the form of an LD off bit, and this bit is set to "1" when light emission is stopped.

The status data is reported to the control device, and the control device knows that the laser diode has stopped emitting light.

When the control device uses an optical disk device in which the LD off bit is set to "1", it issues a light emission recovery command via the control line.

When the device receives this command, it lights up the laser diode, applies the track/focus servo, and when it is ready for recording/playback, sets the LD off bit to “O”.
”, this is notified to the control device.

[Effects of the Invention] As explained above, according to the present invention, it is possible to prevent the life of the laser diode from being reduced unnecessarily, and it is possible to quickly recover the state in which recording/reproduction is possible, so the practical effects thereof are extremely high. It's large.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the principle of the present invention, FIG. 2 is a block diagram of an embodiment of the present invention, FIG. 3 is a time chart of each signal of the optical disk device, FIG. 4 is a block diagram of the main parts of the optical disk device, and FIG. Figure 5 is a system configuration diagram. In the drawings, 1 is a usability judgment means, 2 is a laser diode emission control means, 3 is an LD emission stop notification means, 11 is an OR gate, 12 is NOT times f'3.13
is a timer, 14 is a timer time switching section, 2I
31 is a status data creation unit for the control device; 41 is a track/focus control unit; and 51 is an instruction decoding unit. Figure 1: A block diagram of the principle of the present invention. Figure 2: A block diagram of an embodiment of the present invention. Figure 2: Time chart of each signal of the optical disk device.
Figure System configuration diagram Figure 5

Claims (2)

[Claims] (1) Reading/reading information under the control of the optical disk controller
In an optical disk device that performs writing, determining means (1) for determining whether or not the optical disk control device has a possibility of using the optical disk device; and a possibility of the determining device (1) using the optical disk device. The optical disk control apparatus includes a control means (2) for stopping the light emission of the laser diode according to a determination result of "no", and a means (3) for notifying the optical disk control apparatus of the state in which the light emission of the laser diode has been stopped. When it is determined that there is no possibility of using the optical disk device, do not stop the rotation of the spindle motor.
1. A control method for an optical disc device, characterized in that it is configured to stop a laser diode from emitting light and notify an optical disc control device that the laser diode has stopped emitting light. (2) A control system for an optical disc device according to claim 1, characterized in that the criterion for determining the usability of the usability determining means (1) can be variably set.