KR940006891B1 - Laser disk error recording deciding apparatus - Google Patents

Abstract

The WORM type laser disk writting device has a writting error detection circuit including a comparator (3) whose inputs are the read data and the data from an R-C integrator (5); a multivibrator (6) generating disable counter control signal when the output of the comparator (3) has falling edges; a counter (4) counting the number of data which are correctly written.

Description

Wrong recording judgment device on optical disc

1 is a conventional circuit diagram.

2 is a circuit diagram of the present invention.

3 is a waveform diagram showing normal recording and abnormal recording of a conventional circuit diagram.

4 is a waveform diagram showing normal recording and abnormal recording of the present invention.

* Explanation of symbols for main parts of the drawings

1: Offset generator 2: Delay unit

3: comparison unit 4: counter

5 Integral Circuit Part 6: Monostable Multivibrator

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus for judging a wrong recording of an optical disc, and more particularly, to an WORM (WRITE ONCE READ MANT) type optical disc driving apparatus capable of recording only once and several times of reproduction, and an apparatus for judging an error of an optical file system.

The WORM type optical disc drive device is a device for recording and reproducing information on a disc by using a laser beam. The WORM type optical disc drive device is a device capable of recording only once and reproducing a number of times. The recording of the WORM type optical disc drive device uses a laser spot. It is necessary to confirm whether or not the information recording in the WORM type optical disk drive device is properly performed because the recording is performed by forming a hole on the disk surface so that it cannot be recorded on the disk surface once recorded. That is, when a laser spot of appropriate output is applied to the optical disk surface, a groove should be formed in the disk surface, but sometimes there is a problem that it is necessary to confirm this because there are cases in which a gap is not formed for various reasons.

Conventionally, in order to solve such a problem, a circuit is constructed as shown in FIG. 1 and the timing diagram is shown in FIG. 3 and FIG. 4.

The offset generation unit 1 and the delay unit 2 which receive the data read from the disc are configured to be connected to the counter 4 via the comparison unit 3, so that the comparison unit 3 is provided with the offset generation unit ( Only when the input signal of 1) is smaller than the input signal of the delay unit 2, a zero signal is output and applied to the enable terminal EN of the counter 4.

) 신호가 클럭단(CK)에 인가되고 이때 디스크에 기록이 정상적으로 되었다면 상기 펄스(

) 신호의 상승점(Rising Edge) 동안만 상기 계수기(4)가 디스에이블(Disable)되어 출력신호가 없지만, 디스크에 기록이 정상적으로 되지 않았다면 상기 펄스(

) 신호의 상승점동안에 상기 계수기(4)가 인에이블(Enabed) 되어져 계수기(4)가 카운팅 동작을 하며 이와 같은 카운팅 특정한 횟수 이상되면 상기 계수기(4)가 외부로 캐리(Carry) 신호를 출력하여 기록이 제대로 되지 않았다는 에러(Write Error) 신호를 내보낸다.On the other hand, the counter 4 is set to a specific value and the pulse (

) Signal is applied to the clock stage CK and at this time the pulse (

Only during the rising edge of the signal, the counter 4 is disabled and there is no output signal, but the pulse (

The counter 4 is enabled during the rising point of the signal, and the counter 4 counts. When the counting time exceeds the predetermined number of times, the counter 4 outputs a carry signal to the outside. Sends an Error (Write Error) signal that the recording was not successful.

As such, when information is normally recorded on the disk surface, holes are formed in the disk surface, and the intensity of the reflected light beam is weakened as in the read signal of FIG. 3 (a), but when the information is not normally recorded on the disk surface, Since no draft is formed, the intensity of the reflected light beam is almost unchanged.

In the conventional technology as described above, a complicated circuit such as an offset generator and a delay unit for delaying a time corresponding to half of a write pulse has a disadvantage.

In order to solve the above disadvantages, the present invention has been made. The objective of the present invention is to replace the conventional offset generator and the delay unit with a simple RC integrating circuit so that the circuit can be simply configured, resulting in improved economics and speed. have.

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

The data read from the disk is connected to one side of the comparator 3 and connected to the other side of the comparator 3 through an integrating circuit 5, and the output of the comparator 3 is a falling edge. It is configured to be connected to the enable terminal EN of the counter 4 through the monostable multivibrator MSV operating at.

The effect of these will be described below.

First, as shown in (a) of FIG. 4 during normal recording, when a write signal is applied to a disc, the value of the beam reflected at the rising edge of the write signal is reset to an initial value. When the output signal of the integrating circuit 5 does not exceed a certain level during the amplitude of the write signal, the read signal and the integrating circuit part ( 5) Read signals cross each other.

Accordingly, the output of the comparator 3 receiving the read signal and the read signal through the integrating circuit unit 5 is an integrating circuit unit 5 with a read signal through the integrating circuit unit 5. If it is greater than the read signal that does not pass through), it becomes a zero output, which disables the counter 4 through the monostable multivibrator 6, which causes the counter 4 to Let the outsider know that it's done.

)의 상승점(Rising Edge) 동안 상기 비교부(3)의 출력이 단안정 멀티 바이브레이터(MSV)를 통해 계수기(4)를 인에이블시키고 상기 계수기(4)는 카운팅을 행하여 이 카운당값의 일정한값 이상이 되면 상기 계수기(4)의 출력신호(Carry)는 외부로 출력되어 디스크면상의 기록이 제대로 이루어지지 않았음을 알려준다.On the other hand, as shown in (b) of FIG. 4, a read signal through the integrating circuit unit 5 does not pass through the integrating circuit 5 during a write signal during abnormal writing. Is less than

The output of the comparator 3 enables the counter 4 through a monostable multivibrator (MSV) during the rising edge of < RTI ID = 0.0 > (8) < / RTI > When the value is greater than or equal to the value, the output signal Carry of the counter 4 is output to the outside, indicating that the recording on the disk surface is not performed properly.

As described above, by replacing the conventional complex off-jet generating unit and the delay unit with one simple RC integrating circuit, the circuit configuration is easy, the speed is improved, and the cost is reduced.

Claims (1)

A comparator 3 which receives a signal (Read signal) read from the disc as an input, an comparator 3 which receives a signal which does not communicate with the signal through the integrating circuit 5, a monostable multivibrator 6 and a counter ( 4) are connected and the output of the comparator by the read signal is enabled / disabled through the monostable multi-vibrator 6 according to the normal recording and abnormal recording on the disc. And an abnormal recording signal on the optical disc according to the present invention.

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