JPH04123359A - Optical disk device - Google Patents

Abstract

PURPOSE:To reduce the current consumption of a motor by reducing the rotational frequency of an optical disk except at the time of recording/reproducing or in the case of the absence of an access command from the external to an optical disk device for a certain time. CONSTITUTION:Output sides of a command analyzing part 13, a write circuit 4, and a read circuit 5 are connected to the input side of a timer 20, and the output side of the timer 20 is connected to the input side of a speed control part 10. The rotational frequency of an optical disk 1 is reduced by the command analyzing part 13, which monitors the instruction for the optical disk device from a higher-order device, and the timer 20 if the instruction from the higher-order device is not a recording or reproducing instruction or is absent for a certain time. Thus, the current consumption of the motor is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical disc device that can record and reproduce information on an optical disc.

[Prior Art] FIG. 2 shows a conventional optical disc device disclosed in Japanese Patent Publication No. 61-196465. In the figure, (1)
is an optical disk, (2) is a motor that rotates the optical disk (1), (3) is an optical head that performs recording and playback on the optical disk (1), and (4) is an optical device that connects the optical disk ( 1) A write circuit that writes data to (
5) is a reading circuit that reads data from the optical disk (1) via the optical head (3), (6) is a data modulation circuit that converts input data into a recording pattern, and (7) is a variable frequency that synchronizes with the reproduced data. Oscillator (hereinafter referred to as VFO), (8) is a data demodulation circuit that demodulates reproduced data, (9) is a servo circuit for motor (2), and (lO) is a speed control unit that controls the speed of motor (2). , (II) is an input terminal for recorded data, (12) is an output terminal for reproduced data,
(13) is a command analysis unit that analyzes input commands;
(14) is a recording unit that stores commands related to playback from the output of the command analysis unit (13), (15) is a speed instruction input terminal, and (16) is a command related to recording and playback (speed ) is a speed storage unit that stores the speed.

Next, the operation will be explained. When recording data, the motor (2) rotates at the recording speed normally stored in the speed storage section (16), and the recording data input terminal (1
Input the data to be recorded from 1) and send it to the data modulation circuit (6).
) and is recorded on the optical disk (1) from the optical head (3) via the write circuit (4).

When reproducing data, a reproduction speed instruction is input from the speed instruction input terminal (15), and the command analysis unit (13)
from the storage unit (14) to the data demodulation circuit (8) and V
Notify the speed to FO (7). At the same time, the command analysis section (13) transmits a signal to the speed control section (10) via the speed storage section (16) to rotate the motor (2) at the speed during playback. Rotate with. The reproduced data is read from the optical disk (1) by the optical head (3), and is read by the reading circuit (5) and the VFO (
7), and is outputted to the reproduced data output terminal (12) via the data demodulation circuit (8).

[Problems to be Solved by the Invention] Since the conventional optical disc device is configured as described above, even when not recording or playing, the optical disc (1) is rotated at the same speed as when recording or playing, and the motor is rotated. (2) has the problem of wasted current consumption.

This invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an optical disc device in which the current consumption of the motor is reduced when there is no command for accessing the optical disc device from outside or for a certain period of time other than recording and reproducing the optical disc. With the goal.

[Means for Solving the Problems: An optical disc device according to the present invention is an optical disc device that records and plays information by rotating a first disc, and has a rotational speed Nrpi of an optical disc during recording and playback when other times than recording and playback. Alternatively, if there is no command to access the optical disc device from the outside for a certain period of time, the rotational speed of the optical disc is set to Mrpm (0<M<N).

[Function] In this invention, when the command from the host device is other than a recording or playback command, or when there is no command from the host device for a certain period of time, the command analysis unit and timer that monitor the command from the host device to the optical disk device are used. To reduce the current consumption of the motor by slowing down the rotation speed of the optical disc.

[Example 1] An example of the present invention will be described below with reference to the drawings. 1st
The figure is a configuration diagram showing an embodiment of the present invention. In FIG. 1, (1) to (13) and (15) are completely the same as the conventional device. (20) is a timer, which includes a command analysis section (13), a writing circuit (4) and a reading circuit (5).
Each output side is connected to the input side of the timer (2G), and the output side of the timer (20) is connected to the input side of the speed control unit (1O).

Next, the operation will be explained. When recording data, when a command to record data is sent from a host device (not shown) to the optical disk device, the command is sent to the input terminal (15
) is input to the command analysis unit (L3). Since the input command is a recording command, the command analysis section (1
3) sets the timer (20). However, at this time, the timer (20) has not yet been activated. timer(
20) is set is transmitted to the speed control section (10). Based on this state, the speed control section (1G) is controlled by the servo (
9), the motor (2) is rotated at the recording and reproducing speed. The data to be recorded is input to the recording data input terminal (11)
The data is inputted from the data modulation circuit (6) and the write circuit (4) to the optical system, and is recorded on the optical disc (1) from the data modulation circuit (6) and the write circuit (4). A signal indicating the operating state of the write circuit (4) is input to the timer (20), and the timer (20) is activated when the write circuit (4) transitions from an operating state to a stopped state. .

Thereafter, the timer (20) is reset after a certain period of time has elapsed. Depending on the state in which the timer (20) is reset, the speed control unit (10) rotates the motor (2) via the servo (9) at a speed slower than the recorded speed.

A similar operation occurs when reproducing data. The reproduced data is read from the optical disk (1) by an optical head,
Reading circuit (5), VFO, (7), data demodulation circuit (
8) and is output to the reproduction data output terminal (12). A signal indicating the operating state of the reading circuit (5) is input to the timer (2o), and the timer (20) is activated when the reading circuit (5) transitions from an operating state to a stopped state. Thereafter, the timer (20) is reset after a certain period of time has elapsed. Depending on the state in which the timer (20) is reset, the speed control unit (10) rotates the motor (2) via the servo (9) at a speed slower than the regeneration speed.

Also, when the command analysis section (13) receives an instruction other than recording or reproduction from the input terminal (15), for example, a so-called seed instruction to move the optical head (3) to a predetermined position, the command analysis section (13) uses a timer ( 20), the timer (20) is in a recent state, and therefore, at this time, the motor (2) is rotated at a speed slower than the recording and reproducing speeds.

[Effects of the Invention] As described above, according to the present invention, 1. In an optical disc device that records and reproduces information by rotating an optical disc,
The rotational speed of the optical disk during recording and playback is set to Mrpt* (0<M<N) when there is no command to access the optical disk device from the outside or when there is no command to access the optical disk device from the outside for a certain period of time other than the rotational speed of the optical disk during recording and playback. Therefore, there is an effect that unnecessary current consumption is eliminated and the current consumption of the motor is reduced.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of an optical disk device according to the present invention, and FIG. 2 is a block diagram showing a conventional optical disk device. In the figure, (1) is an optical disk, (2) is a motor, (
3) is an optical head, (4) is a write circuit, (5) is a read circuit, (6) is a data modulation circuit, (7) is a variable frequency oscillator (YFO), (8) is a demodulation circuit, (9) is the servo circuit, (1G) is the speed control section, (13th command analysis section,
(20) is a timer. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] In an optical disk device that records and plays information by rotating an optical disk, the number of rotations N of the optical disk during recording and playback is
An optical disc device characterized in that the rotational speed of the optical disc is Mrpm (0<M<N) at times other than recording/reproducing or when there is no external command to access the optical disc device for a certain period of time.