KR950000127B1 - Track jump/seek control device & method of position error rivision - Google Patents

Abstract

The device includes a first peak detection unit (1) which detects the tracking-error peak signal by inputting the tracking-error signal that crosses a track, a peak value detection unit (2) which outputs the disk landing signal and disk groove signals by inputting the sum signal (SUM) and detecting the peak value of the sum signal, and a flip-flop (3) which generates the tracking-error peak signal by applying the clear signal from a clear signal unit.

Description

Track Jump / Cheek Control Device and Method by Position Error Correction

1 is a schematic principle explanatory diagram for explaining the present invention.

2 is a block diagram according to the present invention.

3 is a timing diagram according to the present invention.

4 is a detailed circuit diagram of a tracking error peak value detector.

5 is an output waveform diagram of FIG.

6 is a detailed circuit diagram of a combined signal peak value detector.

7 is a process flow diagram in accordance with the present invention.

* Explanation of symbols for main parts of the drawings

1, 2: peak value detection circuit section 3: flip-flop

4, 5, 6: OP amplifier 7: Differential circuit

8: comparator

The present invention relates to a track jump / seek control apparatus and method for correcting a position error occurring during track jump (TRACK JUMP) of a optical disk drive and seek (SEEK) operation for searching for a target track.

In general, an optical disc drive adopting a method of compensating an error by comparing a tracking error reference signal T _REF with a tracking error at the beginning of a track jump and seek operation, when the slope of the tracking error is changed by various factors of the disc. As shown in the figure, the value obtained by adding the tracking error reference signal and the tracking error signal is different, so that even when the beam BEAM is at the same position, the value applied to the actuator is changed to correct the position error. There was a problem that the position error correction could not be performed.

In order to solve the above problems, the present invention raises the power of the optical disk drive, and when only the focus servo is turned on, a tracking error that crosses a track occurs due to a radial run out of the disk. Detects the peak value of the tracking error, measures the time between the two peak values, calculates the slope of the tracking error, and stores it in the ROM corresponding to the slope of the tracking error during track jump and track operation performed to read / write data to and from the disc. It is an object of the present invention to provide a track jump and seek control device capable of correct track error and seek control by selecting and outputting one of various patterns of tracking error reference signals and correcting the position error.

In order to achieve the above object, the present invention provides a first peak value detecting means for detecting a tracking error peak signal by inputting a tracking error signal crossing a track, and receiving an output signal of the first peak value detecting means to a clock stage and clearing it. A flip-flop for receiving a clear signal to a signal terminal and outputting a tracking error peak value signal, and a peak value detecting means for detecting a peak value of the sum signal by receiving a sum signal (SUM) and outputting a disc land signal and a disc groove signal; A device configured to operate the system, and when the system is started with power supply, only the focus servo (not shown) is turned on and the tracking error peak time is measured. After performing the first step, the disk land signal and the disk groove signal are If it is not high, the process of measuring the time of tracking error can be If high, and after performing the second step and each step to obtain the slope, the ratio of the tracking error slope measured in the land portion and the groove is compared, the driver determines the tracking error reference signal type to track jump and seek The third step is to select and terminate the required tracking error reference signal type.

Briefly describing the present invention, a timing at which a peak value of a tracking error that occurs when only a focus servo (not shown) is turned on before driving an optical disk drive is detected to determine a slope of the tracking error, In operation, the tracking error reference signal corresponding to the slope of the tracking error is applied at the beginning of the track jump and seek operation.

Based on the above description, the present invention will be described in detail below with reference to the accompanying drawings, FIG.

2 is a schematic block diagram according to the present invention, (a) is a tracking error peak value detection circuit diagram, (b) is a sum (SUM) signal peak value detection circuit diagram, and FIG. 3 is a waveform diagram according to FIG. (a) is a state diagram of a disk cross section, (b) is a tracking error timing diagram, (c) is an output waveform diagram of a peak value detection circuit section, (d) is a tracking error peak value waveform diagram, and (e) a summation signal waveform diagram. (f) is a disc land timing diagram, and (g) is a disc groove timing diagram.

In the figure, 1 and 2 represent peak value detection circuit sections, and 3 represents flip-flops, respectively.

As shown in the figure, a peak value detection circuit section 1 for inputting a tracking error signal that crosses a track to detect a tracking error peak signal, and an output signal of the peak value detection circuit section 1 are applied to the clock terminal to receive a clear signal terminal. JK flip-flop (3), which receives a clear signal of the signal and outputs a tracking error peak value signal, detects the peak value of the sum signal by receiving the sum signal, and outputs a disc land signal and a disc groove signal by each circuit element built therein. The peak value detection circuit part 2 is comprised.

FIG. 4 is a detailed circuit diagram of the tracking error peak value detection circuit section, and FIG. 5 is an output waveform diagram of the tracking error peak value detection circuit section, where 4, 5, and 6 are OP amplifiers, 7 is a differential circuit, and 8 is a comparator. (a) shows a tracking error signal waveform diagram, (b), (c) and (d) shows an amplifier output waveform diagram, (e) shows an output waveform diagram of a differential circuit section, and (f) shows an output waveform diagram of a comparator. .

The amplifier 4 receiving the tracking error signal of the waveform (a) represents the output waveform of (b), and the waveform of (b) is applied to the amplifier 5 and added to the tracking error signal, which is added to the amplifier. The output of (4) is added by doubling the amplitude, so that the waveform of (c) is output. The output of the amplifier 5 is applied to the differential circuit section 7 via the amplifier 6 and crosses the zero point at the peak value of the waveform of (d), and is output like the waveform of (e). The signal crossing the zero point is again applied to the comparator 8 to output the waveform of (f).

FIG. 6 is a detailed circuit diagram of the sum signal peak value detecting circuit section, in which 9, 12 and 13 are amplifiers, 10 and 14 are differential circuit sections, and 11 and 15 are comparators, respectively.

When only the focus servo (not shown) is turned on in the drawing, a tracking error signal and a summation signal as shown in (b) and (e) of FIG. 3 are generated by the radial run out of the disc. Error signal peak values, disk land signals, and disk groove signals are generated and applied to a drive controller (not shown). Here, the separation of the summation signal is applied according to the directions of the diodes respectively installed.

The drive controller checks the time for which the high (or low) value of the tracking error signal peak is maintained to obtain the ratio of the time for maintaining the high and low values.

At this time, as shown in FIG. 3, the slope of the tracking error rises or falls according to whether the signal applied while the tracking error peak value signal is held high (or low) is a disk land or a disk groove. .

Accordingly, when the slope ratio of the tracking error is obtained, a more accurate position correction can be performed by outputting a tracking error reference signal (shown in the table below) during track jump and seek.

[Table] Tracking error reference signal rate memorized in ROM

7 is a general flow diagram of track jump and seek control in accordance with the present invention.

When the system is started with the power supply, only the focus servo (not shown) is turned on (16) and the tracking error peak time is measured (17).

If the disc land signal is high (18), the land unit measures the tracking error inclination (19). If the disc land signal is high (19), the disc groove signal is high (20). Process 17 is performed below, and if it is high, the slope of the tracking error in the groove is measured (21).

Next, by comparing the ratio of the tracking error slope measured by the land part and the groove (22), the tracking error reference signal type is determined by the driver (not shown) to select the tracking error reference signal type required for track jump and seek. And end (23).

Therefore, since it is possible to more accurately correct the position error occurring during track jump and seek, an accurate track jump and seek operation is made possible.

Claims (4)

A first peak detecting means (1) for detecting a tracking error peak signal by inputting a tracking error signal that crosses a track, and an output signal of the first peak value detecting means (1) is applied to a clock terminal to the clear signal terminal; A flip-flop 3 that receives a clear signal and outputs a tracking error peak value signal, and a peak value detecting means 2 that receives a sum signal SUM to detect peak values of the sum signal and outputs a disc land signal and a disc groove signal 2 Track jump / seek control device by the position error correction, characterized in that it comprises a). 2. The circuit according to claim 1, wherein the first peak value detecting means (1) comprises: amplifying means for receiving a tracking error signal, a differential circuit means (7) for differentiating an output signal from the amplifying means, and the differential circuit means (7). And a comparison means (8) for receiving the differential output of the < RTI ID = 0.0 > a) < / RTI > and comparing and outputting the peak value of the tracking error signal. 2. The amplification of the first amplifying means (9) according to claim 1, wherein said second peak value detecting means (2) is adapted to apply and amplify a sum signal (SUM) along the direction of the diode. Characterized in that it comprises a differential circuit means (10) for differentiating the corrected signal and a comparison means (11) for receiving the differential output of the differential circuit means (10) and comparing the peak values of the tracking error signals. Track jump / seek control by position error correction. In the operating method of the track jump / seek control apparatus by the position error correction provided with the 1st, 2nd peak value detection means (1, 2) and the flip-flop (3); When the system is started by the power supply, after performing the first steps 16 and 17 and the first steps 16 and 17 that measure only the tracking servo peak time and turn on the focus servo (not shown), the disc land signal and the disc After the second step (18 to 21) and the second step (18 to 21) of performing the following steps to determine whether the groove signal is high to determine the time of the tracking error if it is not high, and to obtain the slope if the high And comparing the ratio of the tracking error slope measured in the land part and the groove, and determining the tracking error reference signal type by the driver to select and terminate the tracking error reference signal type required for track jumping and seeking (22, 22). 23) A method of operating a track jump / seek control by the position error correction, characterized in that consisting of.