JPH09288863A - Method for shortening access time of cd-rom driving device and cd-rom driving device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten an access time by adjusting a revolution of a CD-ROM disk with a move of an optical pickup and controlling the number of revolutions corresponding to a target address when the pickup is positioned at the target address. SOLUTION: When an accessing operation is started, a spindle revolution speed adjusting part 7 detects the rotation of CD-ROM disk 1 based on a revolution control signal from a digital signal processing part 5. It detects also a moving direction of an optical pickup 2. When the pickup 2 is moved in the radial direction of the disk 1, the moving amount is detected by an encoder 3, which transmits pulses to a microcomputer 6 and the spindle revolution speed adjusting part 7. The adjusting part 7 outputs a kick signal and a brake signal along with the move of the pickup 2 based on the number of revolutions of the disk 1, the moving direction of the pickup 2, and its moving amount. A driving part 8 receiving this signal outputs a signal to the spindle motor 9 to adjust the number of revolutions of the disk 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reducing access time in a CD / ROM drive device for reading out data such as images, music or computer programs recorded on a CD / ROM disc, and a method for implementing this method. And a CD / ROM drive device for performing

[0002]

2. Description of the Related Art A CD / ROM drive device is a CD / R
While rotating the OM disc at high speed, this CD ROM
The optical pickup is scanned in the radial direction of the disc, and the CD
-The data recorded on the ROM disk is being read.

Here, since the data of the CD / ROM disc is recorded in a format having a constant linear velocity, C
When reading the data recorded on the inner circumference side of the D / ROM disc, rotate the CD / ROM disc quickly.
CD / ROM to read data recorded on the outer circumference
The disc was spinning slowly.

A conventional CD / ROM drive device is shown in FIG.
As shown in FIG. 3, an optical pickup 102 for reading data from the CD / ROM disc 101, an encoder 103 for detecting the amount of movement of the optical pickup 102 in the radial direction of the CD / ROM disc 101 and outputting a pulse, and an optical pickup 102. Amplifies the read data signal,
An analog signal processing unit 104 to be digitized, and processes such as demodulation and error correction of the data signal digitized by the analog signal processing unit 104, and CD / R
A digital signal processing unit 105 that outputs a rotation speed control signal for controlling the rotation speed of the OM disk 101, and a microcomputer 1 that detects the end of movement of the optical pickup 102 based on the pulse output from the encoder 103.
06, and a driver unit 10 that outputs a drive signal based on the rotation speed control signal from the digital signal processing unit 105.
7 and a spindle motor 108 for rotating the CD / ROM disk 101 based on the drive signal from the driver unit 107.

A conventional CD / RO having such a structure
The M drive device reads the data recorded on the CD / ROM disc as follows.

When a target address on the CD / ROM disk 101 is input to an operating section (not shown), a command signal from the host computer side (not shown) is output, and an access operation to the target address is performed based on this command signal. .

That is, a drive system (not shown) moves the optical pickup 102 in the radial direction of the CD / ROM disc 101 to position the optical pickup 102 at a target address on the CD / ROM disc 101. At this time, the microcomputer 106 detects the movement end of the optical pickup 102 based on the pulse output from the encoder 103.

After that, the digital signal processing unit 105 generates a rotation speed control signal corresponding to the target address based on the data signal from the analog signal processing unit 104, and the rotation speed control signal causes the rotation speed of the CD / ROM disc 101 to be changed. Wait until the number of rotations reaches the target address.
Then, after the number of rotations of the CD / ROM disc 101 reaches the number of rotations corresponding to the target address, reading of data from the CD / ROM disc 101 is started.

[0009]

However, in the above-mentioned conventional CD / ROM drive device, the optical pickup 1
After positioning 02 at the target address on the CD / ROM disk 101, the rotation speed of the CD / ROM disk 101 was set to the rotation speed corresponding to the target address.
There is a problem that a wait time is required until the number of rotations of the OM disk 101 reaches the number of rotations corresponding to the target address, and the access operation takes time.

Further, when the CD / ROM drive device is used as a data recording medium of a computer, there is a problem that the delay of the access operation as described above adversely affects the system performance.

The present invention has been made in view of the above problems. The optical pickup is positioned at a target address on the CD / ROM disc, and at the same time, the rotation speed of the CD / ROM disc is changed according to the target address. It is an object of the present invention to provide a method of shortening the access time in a CD / ROM drive device capable of achieving the above, and a CD / ROM drive device for implementing this method.

[0012]

In order to achieve the above object, a method of shortening the access time in a CD / ROM drive device according to claim 1 is a method for reducing an optical pickup incorporated in a CD / ROM drive device to a CD / ROM drive device. A method for shortening the access time when accessing a target address on a ROM disk, which is a CD at the start of an access operation.
Detecting the rotational speed of the ROM disk and the moving direction of the optical pickup when the optical pickup is accessed to the target address, and detecting the rotational speed of the CD / ROM disk at the start of the access operation; By adjusting the number of rotations of the CD / ROM disk along with the movement of the optical pickup on the basis of the movement direction of the optical pickup and the movement amount of the optical pickup during the access operation, the optical pickup reaches the target address. When located, the CD ROM
The rotation speed of the disk is set to the rotation speed according to the target address.

A CD / ROM drive device according to a second aspect of the present invention is a CD / ROM drive device for implementing the method for reducing access time according to the first aspect, wherein
A spindle motor for rotating the ROM disk, an optical pickup which is provided so as to be movable in the radial direction of the CD / ROM disk and reads out data recorded on the CD / ROM disk, and a movement amount of the optical pickup. An encoder for detecting, an analog signal processing section for amplifying and digitizing the data signal from the optical pickup, and a signal processing of the data signal digitized by the analog signal processing section, and at the same time, for the CD / ROM disc. A digital signal processing section for outputting a rotation control signal for controlling the number of rotations, a microcomputer for controlling the operation of each section of the apparatus, and for detecting the moving direction of the optical pickup based on a command signal from the host computer side, , At the start of access operation A spindle rotation speed adjusting unit that outputs a kick signal and a brake signal based on the rotation speed of the D / ROM disc, the moving direction of the optical pickup, and the moving amount of the optical pickup during an access operation, and the spindle rotation control unit. And a driver unit for driving the spindle motor based on a rotation control signal from the spindle motor and adjusting the rotation speed of the spindle motor based on a kick signal and a brake signal from the spindle rotation speed adjusting unit. .

According to the method of shortening the access time in the CD / ROM drive device of the present invention and the CD / ROM drive device for implementing this method,
The optical pickup can be positioned at the target address on the CD / ROM disc, and at the same time, the rotational speed of the CD / ROM disc can be set to the rotational speed according to the target address, and the access time can be shortened.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for reducing access time in a CD / ROM drive device of the present invention and an embodiment of a CD / ROM drive device for carrying out this method will be described below with reference to the drawings. To do. FIG. 1 is a block diagram for explaining a method for reducing access time in a CD / ROM drive device according to an embodiment of the present invention and a CD / ROM drive device for implementing this method.

First, a CD / ROM drive device for carrying out the access time reduction method of the present invention will be described.

In FIG. 1, reference numeral 1 denotes a CD / ROM disc on which data such as video, music or computer programs is recorded in a constant linear velocity format. Two
Is an optical pickup, and is provided so as to be movable in the radial direction of the CD / ROM disc 1 by a drive system (not shown). The optical pickup 2 reads the data recorded on the CD / ROM disc 1 and outputs a data signal.

Reference numeral 3 denotes an encoder, which is an optical pickup 2
The amount of movement of the CD / ROM disc in the radial direction is detected, and the detection result is output as a pulse. An analog signal processing unit 4 amplifies and digitizes the data signal from the optical pickup.

A digital signal processing unit 5 performs signal processing such as demodulation and error correction of the data signal digitized by the analog signal processing unit 4. Further, the digital signal processing unit 5 outputs a rotation control signal for controlling the rotation speed of the CD / ROM disc 1 based on the address information included in the data signal.

A microcomputer 6 controls the operation of each part of the apparatus, detects the moving direction of the optical pickup 2 based on a command signal from a host computer (not shown), and outputs a moving direction signal.

Reference numeral 7 denotes a spindle rotation speed adjusting section which operates only during an access operation. Specifically, during the access operation to the target address, the rotation control signal output from the digital signal processing unit 5, the movement direction signal from the microcomputer 6, and the pulse from the encoder 3 are input to start the access operation. The kick signal and the brake signal are output based on the number of rotations of the CD / ROM disc 1 at that time, the moving direction of the optical pickup 2, and the moving amount of the optical pickup 2 during the access operation.

A driver unit 8 drives the spindle motor 9 based on a rotation control signal from the spindle rotation control unit 7 and also the spindle rotation speed adjusting unit 7
The rotation speed of the spindle motor 9 is adjusted based on the kick signal and the brake signal from the. Spindle motor 9
Rotates the CD / ROM disc 1 at a rotation speed based on the driver signal from the driver unit 8.

Next, a method of shortening the access time in the CD / ROM drive device according to this embodiment will be described.

When a target address on the CD / ROM disc 1 is input to an operating section (not shown), a command signal is output from the host computer side, and the target address on the CD / ROM disc 1 is output based on this command signal. Access operation is started.

When the access operation is started, the spindle rotation speed adjusting section 7 operates on the basis of the rotation control signal from the digital signal processing section 5 to read the CD-ROM disc 1 (at the present address) at the start of the access operation. In addition to detecting the rotation speed, the moving direction of the optical pickup 2 is detected based on the moving direction signal from the microcomputer 6.

At the same time, a drive system (not shown) moves the optical pickup 2 in the radial direction of the CD / ROM disc 1. Then, the amount of movement of the optical pickup 2 at this time is detected by the encoder 3, and a pulse is transmitted from the encoder 3 to the microcomputer 6 and the spindle rotation speed adjusting unit 7.

As a result, the spindle rotation speed adjusting unit 7
Is based on the number of rotations of the CD / ROM disc 1 at the start of the access operation, the moving direction of the optical pickup 2, and the moving amount of the optical pickup 2 during the access operation.
A kick signal and a brake signal are output as the optical pickup 2 moves. The driver unit 8 that receives the kick signal and the brake signal outputs the driver signal to the spindle motor 9 to adjust the rotation speed of the CD / ROM disc 1.

After that, when the optical pickup 2 is located at the target address, the microcomputer 6 terminates the access operation based on the pulse from the encoder 3. When the access operation is completed, the rotation speed of the CD / ROM disc 1 becomes the rotation speed according to the target address.
Then, at the same time as the end of the access operation, the optical pickup 2 reads the data at the target address.

[0029]

As described above, according to the method of shortening the access time in the CD / ROM drive device of the present invention and the CD / ROM drive device for implementing this method, the optical pickup is a CD / ROM disc. At the same time that the CD / ROM disk is positioned at the upper target address, the rotation speed of the CD / ROM disk can be made to correspond to the target address, and the access time can be shortened.

[Brief description of drawings]

FIG. 1 is a block diagram for explaining a method for reducing access time in a CD / ROM drive device according to an embodiment of the present invention and a CD / ROM drive device for implementing this method.

FIG. 2 Conventional CD / ROM drive device and this CD
FIG. 6 is a block diagram for explaining an access method in the ROM drive device.

[Explanation of symbols]

 1 CD / ROM disc 2 Optical pickup 3 Encoder 4 Analog signal processing unit 5 Digital signal processing unit 6 Microcomputer 7 Spindle speed adjusting unit 8 Driver unit 9 Spindle motor

Claims (2)

[Claims] 1. A method for shortening the access time when an optical pickup incorporated in a CD / ROM drive device accesses a target address on a CD / ROM disc, the method comprising: The rotation speed is detected, and the moving direction of the optical pickup when the optical pickup is accessed to the target address is detected. The rotation speed of the CD / ROM disc at the start of the access operation and the movement of the optical pickup. When the optical pickup is located at the target address by adjusting the rotation speed of the CD / ROM disc along with the movement of the optical pickup based on the direction and the movement amount of the optical pickup during the access operation, The number of rotations of the CD / ROM disc is set to the target. CD / R characterized by setting the rotation speed according to the address
A method for reducing access time in an OM drive device. 2. A CD / ROM drive device for implementing the method for reducing access time according to claim 1, comprising: a spindle motor for rotating the CD / ROM disc; and a radial movement of the CD / ROM disc. An optical pickup that is provided so as to read data recorded on the CD / ROM disc, an encoder that detects a movement amount of the optical pickup, and an analog that amplifies and digitizes a data signal from the optical pickup. A signal processing unit, which performs signal processing of a data signal digitized by the analog signal processing unit, and which has the CD / ROM.
A digital signal processing unit that outputs a rotation control signal for controlling the number of rotations of the disk, and a micro controller that controls the operation of each unit of the device and detects the moving direction of the optical pickup based on a command signal from the host computer side. Computer and spindle rotation speed that outputs a kick signal and a brake signal based on the rotation speed of the CD / ROM disk at the start of the access operation, the moving direction of the optical pickup, and the movement amount of the optical pickup during the access operation. The spindle motor is driven based on a rotation control signal from the adjustment unit and the spindle rotation control unit, and the rotation speed of the spindle motor is adjusted based on a kick signal and a brake signal from the spindle rotation speed adjustment unit. Having a driver section CD · RO, characterized
M drive device.