JP2001023309A - Optical disk driving device and information reproduction processing method in the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk driving device and its information processing method by which information is instantaneously reproduced when an starting operation is executed. SOLUTION: A DRAM 12 having a function for changing-over into a self- refresh mode or a refresh mode is mounted, data are held by the self-refresh of the DRAM 12 when the device is stopped and the data are used in the case of the next starting operation so that reproduction is instantaneously executed without requiring the start of a servo.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive for driving an optical disk on which digital information such as music is recorded and reproducing the information, and an information reproduction processing method in the apparatus.

[0002]

2. Description of the Related Art Conventionally, for example, a compact disk (C
In an optical disk drive using an optical disk such as D) or a digital video disk (DVD), pits formed on the optical disk are irradiated with laser light, and reflected light (detection light) reflected from the optical disk is detected to obtain information. The signal is being played. In general, when driving is started, the optical disk is first irradiated with laser light, and at the same time, the focus actuator is driven to perform focus servo and the spindle motor is driven. When the spindle motor has reached the specified number of revolutions, apply the tracking servo,
Thereafter, signals are extracted from the optical disk by applying a spindle servo. Further, digital information such as music is reproduced after predetermined data is stored in a memory of a type in which music information and the like are once stored in a memory. In many cases, a volatile DRAM is used as a memory to be used in view of cost and capacity.

[0003]

As described above, servo control is indispensable in the optical disk drive. However, a certain time is required for applying the servo, and a time of about 2 to 3 seconds is required before a signal such as music can be actually reproduced. Further, since the DRAM is used, once the device is stopped, the contents of the memory are cleared, and it is necessary to store the data again at the next startup.

An object of the present invention is to solve such a problem. An object of the present invention is to provide an optical disk drive capable of reproducing information instantaneously when a start-up operation is performed, and an information reproduction processing method in the apparatus. To provide.

[0005]

According to a first aspect of the present invention, there is provided an optical disk driving apparatus for irradiating a laser beam onto an optical disk and converting the reflected light into an electric signal, and rotating the optical disk at a predetermined rotational speed. Optical disc rotation driving means having a driving motor; reproduction signal detection means for amplifying a signal obtained from the optical unit to output a reproduction signal; and detecting the reproduction signal by switching between a refresh mode and a self-refresh mode. Means for storing the reproduced signal from the means, and a volatile memory for controlling the operation of the entire apparatus, and when the stop process is started, the memory is switched from the refresh mode to the self-refresh mode, and the start process is started again. Switch from the self-refresh mode to the normal refresh mode. It has a configuration that includes a central processing unit for controlling to reproduce the reproduced signal. With this configuration, the data stored in the memory is retained by the self-refresh function even when the optical disk drive is stopped, and the data is reproduced using the data at the next start-up. Thus, the information can be reproduced.

According to a third aspect of the present invention, there is provided an information reproducing method for an optical disk drive device, comprising: irradiating a laser beam onto an optical disk; In the information reproducing method in an optical disk drive device for storing and having a DRAM switchable between a refresh mode and a self-refresh mode and applying a servo to the rotation of the optical disk, when a stop process of the optical disk drive device is started, The DRAM is switched from the refresh mode to the self-refresh mode, and when the start-up process is started again, the DRAM is switched from the self-refresh mode to the refresh mode to switch the DRA.
The information is reproduced using the data remaining in M, and the servo start-up processing is performed during that time. According to this, even when the optical disk drive is stopped, the data stored in the DRAM is retained by the self-refresh function, and the data is reproduced using the data at the next start-up. Information can be reproduced instantaneously. Further, since the DRAM generally used in the conventional optical disk drive is used, the present invention can be realized without increasing the cost.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an optical disk drive according to an embodiment of the present invention. In FIG. 1, an optical disc 1 is, for example, a CD (compact disc), and digital information such as music is recorded in pits. The optical disk 1 is rotated at a predetermined rotational speed by using a spindle motor 2 as an optical disk rotation driving means whose driving is controlled by a spindle motor driving circuit 10 as a drive source, and the digital information is read and reproduced by the optical unit 3. You.

The optical unit 3 includes a semiconductor laser light source for irradiating a light beam toward the optical disk 1 and a photoelectric conversion element for receiving the light beam reflected by the optical disk 1 and converting the light beam into an electric signal. Also, the optical unit 3
An objective lens 5 is disposed between the optical disk 1 and the optical disk 1. The objective lens 5 has a focus actuator 6a for controlling the position of a light spot in a focus direction parallel to the optical axis, and a track A tracking actuator 6b for controlling the position of the light spot in the radial direction is attached.

When a light beam is emitted from the semiconductor laser light source of the optical unit 3, the light beam is narrowed down by the objective lens 5 and radiated to the optical disk 1 as a light spot. The light passing through 5 is received by a photoelectric conversion element, converted into an electric signal, and output to an RF circuit 7. The output of the light beam emitted from the optical unit 3 toward the optical disk 1 is controlled by the laser drive circuit 4.

The electric signal converted by the photoelectric conversion element of the optical unit 3 is input to an RF circuit 7 as a reproduction signal detecting means, and the RF circuit 7 generates an RF signal, a focus error signal FE, and a tracking error signal TE. You. Of these, the focus error signal FE and the tracking error signal TE are input to the servo control circuit 8 as servo control means as error signals necessary for the servo control circuit 8, and the servo control circuit 8 uses the error signals based on the error signals. Servo is applied to the actuator control means 9 and the spindle motor drive circuit 10 to drive them.

On the other hand, the RF signal generated by the RF circuit 7 is input to a signal processing circuit 11 and converted into data such as music by the signal processing circuit 11. At this time, a DRAM (Dynamic Random Access Memory) 12 serving as a temporary storage memory is used.
Temporarily stores data such as music information. The DRA
M12 is a memory operable in a refresh mode and a self-refresh mode by switching, and is controlled by a CPU (central processing circuit) 13 as a system controller for performing overall control of a system constituted by a microcomputer. . And
In the optical disk drive of the present embodiment, the CPU 13 is programmed in advance to switch the refresh mode of the DRAM 12 to the self-refresh mode when stopping the optical disk drive in a state where music information is stored in the DRAM 12. FIG. 2 shows the control procedure.

Next, DR will be described with reference to the flowchart of FIG.
The operation of stopping the disk drive device with the music information stored in the AM 12 will be described in the order of steps A to F. First, when the disk drive is stopped in a state where music information is stored in the DRAM 12, the DRAM 1 is stopped.
The refresh mode is shifted to the self-refresh mode according to the procedure specified in Step 2 (Step A). In this state, data in the DRAM 12 is retained as long as the power of the DRAM 12 is supplied. After this, D
The optical disk drive is stopped by turning off the power of the blocks other than the RAM 12 or stopping the clock (step B).

When the optical disk drive is started again, first, the blocks other than the DRAM 12 are operated (step C), and then the mode is switched from the self-refresh mode to the normal refresh mode (step D). In this state, the signal processing circuit 11 can access the DRAM 12, so that information such as music is reproduced using the data remaining in the DRAM 12 (step E). That is, if the servo is started before all the data in the DRAM 12 is reproduced (step F), it is possible to continue reproduction without interruption of information such as music.

Therefore, in the optical disk drive of the present embodiment, when the stop processing is started, the DRAM
12 is switched from the refresh mode to the self-refresh mode.
The AM 12 is switched from the self-refresh mode to the normal refresh mode to reproduce information such as music by using the data remaining in the DRAM 12 and to perform a servo start-up process during that time. Can be reproduced without interruption. That is, the commonly used DRA
By simply switching M12 between the self-refresh mode and the refresh mode, reproduction and the like can be performed instantaneously with almost no change in the configuration of the conventional optical disk drive.

[0015]

As described above, according to the present invention, the DRAM 12 is switched between the self-refresh mode and the refresh mode, and the reproduction or the like can be performed instantaneously without changing the configuration of the conventional optical disk drive. An excellent optical disk drive device that can be performed at a high speed can be realized. Also, since a DRAM generally used in a conventional optical disk drive is used,
Effects such as realization without increasing the cost can be expected.

[Brief description of the drawings]

FIG. 1 is a block diagram of a main part configuration of an optical disk drive according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating an example of a data processing procedure at the time of stopping and starting according to the present embodiment;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical disk 2 Spindle motor 3 Optical unit 4 Laser drive circuit 5 Objective lens 6a Focus actuator 6b Tracking actuator 7 RF circuit (reproduction signal detection means) 8 Servo control circuit (servo control means) 9 Actuator control means 10 Spindle motor control means 11 signal Processing circuit 12 DRAM (memory) 13 CPU (central processing circuit)

Claims (2)

[Claims] An optical unit for irradiating an optical disk with a laser beam and converting the reflected light into an electric signal; an optical disk rotation driving unit having a motor for driving the optical disk at a predetermined rotation speed; Reproduction signal detection means for amplifying the obtained signal to output a reproduction signal; volatile memory switchable between a refresh mode and a self-refresh mode for storing the reproduction signal from the reproduction signal detection means; In addition to controlling the overall operation, the memory is switched from the refresh mode to the self-refresh mode when the stop process is started, and is switched from the self-refresh mode to the normal refresh mode when the start process is started again, and A central processing circuit that controls the reproduction signal to be reproduced. Optical disk drive, characterized in that. 2. A switchable mode between a refresh mode and a self-refresh mode, in which a laser beam is applied to an optical disc and a reflected signal from the optical disc is converted into an electric signal to store a reproduced signal from the optical unit. D
An information reproducing method for an optical disk drive device comprising a RAM and applying a servo to the rotation of the optical disk, wherein when a stop process of the optical disk drive device is started, the DRAM is switched from a refresh mode to a self-refresh mode, and then restarted. When the process is started, the DRAM is switched from the self-refresh mode to the refresh mode, information is reproduced using the data remaining in the DRAM, and the servo start-up process is performed during that time. Information reproduction processing method in an optical disk drive device that performs the information reproduction.