KR900006929A - Track access method of optical disk driver - Google Patents

Abstract

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Description

Track access method of optical disk driver

Since this is an open matter, no full text was included.

2 is a system block diagram for carrying out the present invention;

3 is a detailed circuit diagram of a track counting unit in FIG.

4 is a flow chart according to the present invention.

Claims (1)

CPU 10 for controlling the optical disc driver system, optical disc 20, optical pickup unit 72 for detecting and converting signals recorded on optical disc 20 into electrical signals, and CPU 10 A step motor driving circuit 73 for controlling the optical pickup unit 72 under the control of the control unit, a demodulation unit 71 for demodulating the detection signal of the optical pickup unit 72, and a reduction in the CPU 10. The up or down counting mode is set according to the output of the XOR gate 30 and the XOR gate 30 which generate a track counting mode signal by exclusively ORing the control signal and the head driving direction signal, and the target track of the CPU 10. A track counter 40 which loads the setting data for the number and counts the number of tracks according to the tracking error signal, and a track which buffers the current track number through the data read part 50 and outputs the buffer to the CPU 10. The number buffer 60 and the digital data signal of the CPU 10. A digital analog converter 50 for analogization, a first amplifier 80 for amplifying an output signal of the digital analog converter 50 to output a fine drive signal, and the fine drive signal and the optical pickup unit 72. A target track access method of an optical disc driver having a multiplexer 90 for driving a tracking actuator or forming an autotracking loop according to a state of a servo mode signal generated from the CPU 10 by inputting a generated tracking error signal. In the first and second processes of resetting the disk driver by the CPU 10 and determining whether the disk 20 is changed to another one after performing the first process, focusing is performed when the disk 20 is changed. After fixing the objective lens with the actuator, the timer is reset to set the track counter and the maximum minimum track register. And a second step of inputting a track counter value according to the rotation of the disk 20 after the second process and storing the track counter value in the maximum track register when the track counter 40 value is greater than the maximum track register value. And a fourth process of storing the track counter value in the minimum track register when the track counter value is smaller than the minimum track register value when the track counter value is not greater than the maximum track register value in the third process. And a fifth loop which loops to the third process when the disk is not rotated by checking whether the disk is rotated once when the track counter value is not smaller than the minimum track register value in the fourth process and after performing the third and fourth processes. And track eccentricity by subtracting the minimum track register value from the maximum track register value when the disc is rotated once in the fifth step. And a sixth step of storing the track eccentric value in RAM and looping to the seventh step described below, and determining whether a seek command is input when the disc is not changed to another one in the first step. A seventh process of looping to the process, and when the seek command is input in the seventh process, the number of tracks is set in the track counter 40 according to the target track and the track counter 40 is down counted. An eighth process of determining a reduction control signal, a ninth process of driving a motor to count the tracks, checking whether the tracking actuator is accessible, and looping when inaccessible, after performing the eighth process, and accessing at the ninth process If the track counter value is larger than the track eccentricity, the tracking actuator in the optical pickup unit 72 is driven to move and fix the objective lens. A tenth process of fixing the objective lens to the center of the head at the current position; and an eleventh process of reading the track counter 40 and looping when the track counter is zero after performing the tenth process. In step 11, the track counter 40 is set to the auto tracking mode at 0, and reads the track number from the disk 20 through the track number buffer 60 to check whether the target track is a loop. After setting the twelfth step and the number of tracks according to the number of tracks shifted when the target track is not the target track in the twelfth step, determine the reduction control signal to readjust the count mode of the track counter 40. And a thirteenth process of adjusting the position of the objective lens and returning to the eleventh process. ※ Note: The disclosure is based on the initial application.