KR0132647B1 - Error recompensation apparatus and method of optical magnetic device - Google Patents

Abstract

An apparatus and a method for compensating an error of an optical disc system are disclosed. The apparatus comprises an error signal generator(10) for generating a tracking and a focusing error signals of an actuator; a focusing error detector(20) for detecting the focus error signal from the error signal generator(10); a tracking error detector(30) for detecting the tracking error signals from the error signal generator(10); a first counter(40) for counting the detected focus error signal; a second counter(50) for counting the detected tracking error signal; a compensation unit(60) for inputting an interrupt signal when the count value from the first counter(40) or the second counter(50) reaches a predetermined value, to compensate the error signal; and a driving unit(70) for driving the actuator according to the signal compensated at the compensation unit(60).

Description

Error compensator and method of optical disk device

1 is a block diagram of an error compensator according to the present invention.

2-4 is a waveform diagram according to FIG.

5 is a flowchart of an error compensation method according to the present invention.

* Symbols and descriptions of the main parts of the drawings

10: error generating unit 20: focusing error detection unit

30: tracking error detection part 40: first count part

50: second count unit 60: compensation unit

70: drive unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an error compensation apparatus and method in an optical disc apparatus, and more particularly, to an error detection apparatus and method for compensating tracking and focusing error signals.

In general, an optical disc device is a device for recording or playing back an optical disc as a recording medium. A compact disc player, a compact disc player (CD-I), a mini disc player (MD), or an optical disc drive (MODD) For example. Such an optical disk apparatus must be sufficiently supported by the technology of an actuator for tracking and focusing operations due to the high density of the optical disk which is a recording medium or the high speed of the apparatus. In addition, the error signal of the disk error area and the tracking or focusing of the actuator should be examined to increase the reliability of the optical disk device.

In the conventional optical disc device, since only the error size is specified when tracking and focusing errors are detected, there is a problem that the tracking or focusing operation fails due to a small disc defect when the seek operation or the data access operation of the disc is performed. .

Accordingly, an object of the present invention is to provide an error compensation apparatus and method for compensating for a small error signal by setting a predetermined value to a counter structure in order to solve the above problems.

To this end, an error compensator for detecting tracking and focusing error signals in the optical disc device and compensating for the detected error signal includes an error generating unit for generating an error signal during tracking and focusing of an actuator due to an error area of the disc; A focusing error detecting unit detecting a focusing error signal from the error generating unit, a tracking error detecting unit detecting a tracking error signal from the error generating unit, and a first counting unit counting the focusing error signal detected by the focusing error detecting unit; And an amplitude of the error signal by inputting a second count unit for counting the tracking error signal detected by the tracking error detection unit, and an interrupt signal generated when a predetermined count value is reached in the first count unit and the second count unit. Compensation unit for compensating by the difference of and the signal compensated by the compensation unit It constitutes an emitter to a driver for driving.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the present invention.

FIG. 1 is a block diagram of an error compensator according to the present invention. In an optical disc apparatus using an optical disc as a recording medium, an error generating unit 10 for generating an actuator tracking and focusing error signal due to an error area of the disc is shown. And a tracking error detector 20 for detecting a focusing error signal from the error generator 10, a tracking error detector 30 for detecting a tracking error signal from the error generator 10, and the focusing error detector. A first counting unit 50 for counting the focusing error signal detected at 20, a second counting unit 50 for counting the tracking error signal detected at the tracking error detection unit 30, and the first counting unit; Compensation unit 60 for compensating for the difference of the amplitude of the error signal by inputting an interrupt signal generated when the predetermined value is reached in the unit 40 and the second count unit 50, and in the compensation unit 60By corrupt signal it consists of a drive 70 for driving the actuator.

2 to 4 are waveform diagrams according to FIG.

Figures 2 (a) through (c) show the focusing error output waveforms, Figures 3 (a) through (c) show the tracking error signal detection waveforms, and Figures 4 (a) through (b) show the focusing. And the shape of the tracking error signal.

In FIG. 2, FIG. 2 (a) is the focusing error signal of the actuator, FIG. 2 (b) is the enable signal for detecting the focusing error signal, and FIG. 2 (c) is the focusing error output signal.

In FIG. 3, FIG. 3 (a) is the tracking error signal of the actuator, FIG. 3 (b) is the enable signal for detecting the tracking error signal, and FIG. 3 (c) is the tracking error output signal.

In FIG. 4, FIG. 4 (a) is a form of a focusing error signal when transitioning from focusing off operation to on operation, and FIG. 4b is turning on tracking off operation. This is the type of tracking error signal when transitioning to (On) operation.

Next, the operation of the error detection apparatus shown in FIG. 1 will be described with reference to FIGS. 2 to 4.

An optical disc has a shape of a valley composed of tracks for recording data, and an optical beam follows a track to distinguish it from adjacent data. This is called tracking, and keeping the size of the light beam constant on the surface where data is recorded on the optical disk is called focusing.

The optical disc device can recognize data only when the focusing function and the tracking process are normally operated while the disc is mounted. If the focusing fails, the tracking fails, and the tracking process only works if the focusing function has always been successful.

Focusing maintains a constant beam size of about 1 m mu on the surface of the optical disc, and obtains an error signal in the region (a) of FIG. 4 (a) in the unfocused region. The error signal in the region (a) of FIG. 4 (a) is a signal obtained from an actuator focusing lens (usually a part supporting an objective lens), and the magnitude of the amplitude may vary depending on the flatness of the disk. Focusing obtains an error signal of a small signal amplitude as in the region (On) of one (On). The obtained error signal is output from the focusing error detection unit 20.

The tracking error signal has similar characteristics to the focusing error signal. The focused beam follows the track, and the tracking error signal has the same amplitude as the 3 area in FIG. 4 by the degree of distortion of the track. When the tracking operation is turned on, a tracking error signal is obtained in the area ④. The tracking error signal to the area (4) is output from the tracking error detection unit 30.

That is, the focusing error signal output from the focusing error detection unit 20 and the tracking error signal output from the tracking error detection unit 30 are shown in FIGS. 2 and 3 by the A / D call buddy included therein. Likewise, it is converted into a digital signal and output. The focusing error detection unit 20 and the tracking error detection unit 30 detect amplitudes in areas 1 and 3 of FIG. 4 to monitor that the current actuator is not focused and tracked. Here, the operating error is applied to the focusing error detector 20 and the tracking error detector 30, and a reference voltage of rice is applied to detect the abnormality of the reference voltage.

The focusing and tracking error signal is interrupted when the first counting unit 40 and the second count 50 perform a count sampled by the input clock to reach a predetermined value. Interrupt generation means that the focusing and tracking operations fail for a certain period of time. When an interrupt signal is generated in the first count unit 40 and the second count unit 50, the compensator 60 compensates for the difference in amplitude of the error signal. The driver 70 drives the actuator by inputting the compensated signal.

5 shows a flowchart of an error compensation method according to the present invention.

In FIG. 5, a disk is mounted to check the operation of the spindle motor, and the first step of performing the initial operation when the laser biode is turned on, and focusing when the focusing operation is not normal by determining whether the focusing operation is normal. A second process of correcting the focusing error signal when the error signal is counted to reach the set count value; and determining whether the tracking operation is normal and counting the tracking error signal when the tracking operation is not normal. It consists of a third process of correcting.

Next, the operation flow of FIG. 5 will be described with reference to FIG.

First, a disk which is a recording medium is loaded. When the disc is loaded, it is determined whether the operation of the spindle motor that rotates the disc is normal. If the operation of the spindle motor is normal, turn on the laser diode (100-120 steps).

Next, it is determined whether the focusing operation is normal. If the focusing operation is normal, the tracking operation is performed. If the focusing operation is not normal, a focusing error signal is detected. When the focusing error signal reaches a predetermined count value, the compensator 60 compensates for the focusing error signal. If the error signal is compensated, the actuator is driven (steps 130 to 170).

Next, it is determined whether the tracking operation is normal. If the tracking operation is normal, drive the actuator. If the tracking operation is not normal, a tracking error signal is detected. When the tracking error signal reaches a predetermined count value, the compensation unit 60 compensates for the tracking error signal. If the error signal is compensated for, the actuator is driven (steps 180 to 220).

As described above, the present invention has the effect of improving the performance of the actuator by driving the actuator by correcting the focusing and tracking error signals caused by the defective part of the disk, which is a recording medium.

Claims (3)

In an optical disc apparatus using an optical disc as a recording medium, an error generating unit (10) for generating a tracking and focusing error signal of an actuator due to an error area of the disc, and detecting a focusing error signal from the error generating unit (10). Focusing error detection unit 20, Tracking error detection unit 30 for detecting a tracking error signal from the error generating unit 10, First counting unit for counting the focusing error signal detected by the focusing error detection unit 20 40, a second count unit 50 for counting the tracking error signal detected by the tracking error detection unit 30, and a predetermined count in the first count unit 40 and the second count unit 50; Compensation unit 60 for inputting an interrupt signal to compensate for the difference of the amplitude of the error signal when the value is reached, and a driving unit 70 for driving the actuator by the signal compensated by the compensation unit 60 To Error compensator characterized in that. The error compensating device according to claim 1, wherein the focusing error detecting unit and the tracking error detecting unit convert the generated analog error signal into a digital signal. In the error correction method of an optical disk apparatus using an optical disk as a recording medium, a first process of mounting the disk to inspect the operation of the spindle motor and performing an initialization operation of turning on the laser diode, and determining whether the focusing operation is normal and focusing operation. A second process of correcting the focusing error signal when the focusing error signal is reached by counting the focusing error signal when it is not normal; and determining the tracking error signal by counting the tracking error signal when the tracking operation is not normal. And a third step of correcting the tracking error signal when the count is reached.