KR0162403B1 - Recording device of changeable speed for optical recording system - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording apparatus, and more particularly, to a variable speed recording apparatus of an optical recording system capable of preventing a data recording error caused by a rotational change of a disk when data is recorded on a disk. If the rotational speed of the disk changes due to the rotation, the recording state is kept in the recording standby state until the rotational speed is not changed. If the rotational speed of the disk cannot be changed, the data is recorded as it is, resulting in an error of the recording data. In order to prevent an error, when the motor having a large torque is used, the size of the motor is increased and the volume is increased. However, in the present invention, when the rotation speed of the disk is slowed down by detecting a change in the rotation speed of the disk, laser scanning is performed. Increasing the duration, while increasing the speed of the laser scan The speed was not required to use the power and nophim reliability and at the same time of high-speed recording and the large torque spindle motor of the optical storage device By recording the normal data between, so it is possible that the effect and achieve miniaturization of the device.

Description

Variable speed recording device of optical recording system

1 is a block diagram showing a conventional optical recording / reproducing system.

FIG. 2 is a diagram showing a data pattern recorded on a disc when a disc rotation occurs. FIG.

3 is a diagram showing a data pattern of FIG.

4 is a diagram showing a scanning time of a laser modulated signal.

5 is a diagram showing output waveforms of an RF amplifier unit according to the rotational speed variation of the disk of FIG.

6 is a block diagram showing a variable speed recording apparatus of the optical recording system of the present invention.

FIG. 7 is a diagram showing a data pattern recorded on a disc when rotational variation of the disc occurs according to FIG.

8 shows a data pattern according to FIG. 6;

FIG. 9 is a diagram showing a scanning time of a laser modulated signal when a disk rotational eccentricity is generated based on FIG. 6. FIG.

10 is a diagram showing a data recording waiting time based on FIG.

11 is a diagram showing a data recording waiting time according to FIG.

* Explanation of symbols for main parts of the drawings

210: disc 211: spindle motor

212: optical pickup unit 213: RF amplifier unit

214: analog signal processing unit 215: digital signal processing unit

216: decoder 217: error correction unit

218: memory 219: interface unit

220: encoder 221: clock switching unit

222: buffer memory 223: signal conversion unit

224 peliel 225: clock generator

226: servo amplifier 227: focus tracking unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording apparatus, and more particularly, to a variable speed recording apparatus of an optical recording system capable of preventing a data recording error caused by a rotational change of a disk when data is recorded on the disk.

In the conventional optical recording / reproducing system, as shown in FIG. 1, a disk 110 for storing data, a spindle motor 111 for rotating the disk 110, and data are recorded on the disk 110. As shown in FIG. The optical pickup section 112 for reproducing, the RF amplifier section 114 for amplifying and outputting the data read from the optical pickup section 112, and the waveforms of the RF amplifier section 114 for shaping the waveform. The analog signal processor 115 for outputting the digital signal, the digital signal processor 116 for converting the analog signal shaped by the analog signal processor 115 into a digital signal, and outputting the digital signal; A decoder 117 for decoding and outputting an output signal of the digital signal processor 116 using the output signal of the digital signal processor 115 as a reference signal and a decoded output from the decoder 117 as a reference signal; Of signal An error correction unit 118 for correcting the error, a memory 119 for temporarily storing a signal corrected by the error correction unit 118, and write data input from a host computer (not shown), and the memory 119 And an interface unit 120 connecting the host computer, a position detection unit 112 for detecting the current position of the optical pickup unit 112 by receiving the output signal of the analog signal processing unit 115 and outputting data accordingly. The encoder 121 reads the recording data stored in the memory 119 and the output data of the position detector 122 and encodes them in synchronization with a reference clock, and receives the encoded signals of the encoder 121. The signal converter 124 converts the current and the period of the current to be supplied to the pickup unit 112, and receives the output signal of the digital signal processor 116 and amplifies it, thereby amplifying the spindle motor 111 and the focus tracking unit 125. Control signal And a focus tracking unit 125 for receiving the control signal of the servo amplifier 123 and the focus tracking unit 125 for tracking the focus of the optical pickup unit 112.

The conventional optical recording / reproducing system configured as described above will be described in detail.

In the case of reproducing data on the disc 110, the optical pickup unit 112 reads data about tracks previously recorded on the disc 110 and outputs the data to the RF amplifier 114, and the RF amplifier 114 ) Amplifies and outputs the input data, and the analog signal processing unit 115 receives the input to shape the waveform and then converts the analog signal having the waveform by the digital signal processing unit 116 into a digital signal.

In addition, the signal converted by the arithmetic digital signal processor 116 is input to the decoder 117 and decoded and output using the output signal of the analog signal processor 115 as a reference signal. The error is corrected by 118 and then temporarily stored in the memory 119.

Thereafter, if a request is received from the host computer (not shown), the data is transmitted to the host computer (not shown) through the interface unit 120.

On the other hand, when data is recorded on the disk 110, data from the host computer (not shown) is stored in the memory 119 through the interface unit 120, and the position detection unit 122 is the analog signal processing unit 115. The encoder 121 reads the data and position data stored in the memory 119 by detecting the position of the current optical pickup unit 112 and outputting the position data according to the encoder 121. It is encoded in synchronization with a clock and output to the signal converter 124.

The signal converting unit 124 receives the output of the encoder 121 and converts the current into a magnitude and a period (time) of a current to be supplied to a laser diode (not shown) of the optical pickup unit 112, thereby outputting the disk 110. Data is recorded.

However, as shown in FIG. 4, even when the laser scanning time of the optical pickup unit 112 is constant, data that is recorded as shown in FIG. Is longer (c) or shorter (b) than the normal data (a), and a recording error occurs. In the case of (a) of FIG. 3, the data pattern is obtained when the rotational speed of the disk is increased due to the eccentricity. In the case of (b), the data pattern is shown in the case of normal rotation, and in case of (c), the data pattern is shown when the rotational speed is increased.

That is, even if the data length is recorded as a, the data length is recorded as b or c depending on the rotation speed.

In addition, when an eccentricity occurs, the track to be originally recorded on the disk 110 moves toward or outside the center of the spindle motor 111. When moving toward the center, the spindle motor 111 should be rotated more quickly, whereas outward. As you move, you should slow down and rotate.

However, if the torque of the spindle motor 111 is not large enough, since the rotational speed cannot be accelerated or decelerated in a short time, the data pattern is changed, and as shown in FIG. ) Slow (c) results in timing jitter (ΔT), and the recording time may be longer depending on the ability of the spindle motor 111 to record from the center of the disk 110 and then from the outside. When recording from the outside while recording from the center, an acceleration time for accelerating the number of revolutions of the spindle is required. As shown in FIG. 10, a long time is required for recording even if the jump is completed on the target track.

As described above, in the conventional optical recording / reproducing system, when the rotational speed of the disk is changed due to eccentricity during data recording, the recording state is placed in the recording standby state until the rotational speed is eliminated, and the spindle rotation speed cannot be changed. As the recording is performed as it is, errors in the recording data are generated. In order to prevent such errors, when the motor having a large torque is used, the size of the motor is increased and the volume is increased.

Accordingly, the present invention aims to accurately record data by detecting a change in the rotational speed of the disc and changing the scanning time of the laser correspondingly, and the present invention having such an object will be described in detail. .

As shown in FIG. 6, the variable speed recording apparatus of the optical recording system of the present invention includes a disk 210 for storing data, a spindle motor 211 for rotating the disk 210, and a disk 210. As shown in FIG. An optical pickup unit 212 for reproducing / recording data, an RF amplifier unit 213 for amplifying the data read from the optical pickup unit 212, and an analog waveform forming unit for outputting the RF amplifier unit 213 The signal processing unit 214, the memory 218 for temporarily storing the recording data to be recorded on the disk 210, the output signal of the analog signal processing unit 214 and the output signal of the PEL 224 is applied to the A clock generator 225 for generating a clock corresponding to the rotational speed of the disk 210, and an encoder for reading and recording the recorded data stored in the memory 218 and encoding the synchronously with the clock generator 225 for outputting the encoder. 220 and the output of the encoder 220 PEL (224) Or the switching unit 221 which determines whether to apply to the buffer memory 222, and the PEL which locks this signal and outputs the output to the clock generator 225 when there is an output from the switching unit 221. L 224, the output of the encoder 220 is input through the switching unit 221, the buffer memory 222 for temporarily storing the input, and the optical pickup unit receives the output of the buffer memory 222 And a signal converting unit 223 for converting the magnitude of the current to be supplied to 112 into a period.

The present invention configured as described above will be described in detail with reference to FIGS. 6 to 9 and 11.

On recordable discs, grooves are generally engraved for tracking servo, which are modulated by groove wobble signals, which address and timing signals are recorded.

Therefore, the optical pickup unit 212 reads the wobble signal and outputs the wobble signal to the RF amplifier 213, and the RF amplifier 213 receives the signal and amplifies the RF waveform by separating it. 214).

The analog signal processor 214 shapes the waveform of the RF signal output from the RF amplifier 213, and the shaped waveform is applied to the clock generator 225. The analog signal processor 214 receives the RF signal shaped to generate a clock corresponding to the rotational speed of the disk 210.

On the other hand, the recording data for recording on the disk 210 output from the host computer (not shown) is input to the memory 218 through the interface unit 219 to be temporarily stored and output to the encoder 220.

The encoder 220 encodes the write data input from the memory 218 in synchronization with the clock of the clock generator 225 and outputs the encoded data to the switching unit 221. In this switching unit 221, the encoded signal is output. Is locked by inputting to Piel (224).

The locked signal is input to the clock generator 225 again, and a clock is generated accordingly. The locked signal is encoded by the encoder 220 and output to the buffer memory 222 through the switching unit 221.

The signal stored in the buffer memory 222 is output to the signal converter 223 and converted into a magnitude and a period (time) of a current to be supplied to a laser diode (not shown) of the optical pickup unit 212. If rotational variation has occurred at 210, the converted signal is outputted with varying scanning time for each data as shown in FIG. 9, so that data of a certain length is recorded as shown in FIG.

8 illustrates the recording data of FIG. 7 in more detail. When the rotation speed of the disc 210 is normal, it is the same as (b). In the case of (a), the rotation speed of the disc 210 is slowed down. As shown in (a) of FIG. 9, the scanning time of the laser is increased to increase the data length of b 'as shown in b. On the other hand, when the rotational speed of the disk 210 is increased as in (c), FIG. Shorten the syringe length of the laser as in (c), and shorten the data length of c 'as in c.

Therefore, as shown in FIG. 11, data can be continuously recorded even if data recording is not held until the normal rotational speed is reached after the rotational speed of the disc 210 is changed.

As described above, the present invention detects a change in the rotational speed of the disc, and increases the interval between the syringes of the laser when the rotational speed of the disc decreases, while recording the normal data by shortening the interval between the syringes of the laser when the rotational speed increases. In addition to improving performance and reliability, it is not necessary to use a spindle motor with a high recording speed and a high torque, thereby miniaturizing the device.

Claims (2)

A disk for storing data, a spindle motor for rotating the disk, an optical pickup section for reproducing / recording data on the disk, an RF amplifier section for amplifying the data read by the optical pickup section, and the RF amplifier section. An analog signal processor for waveform shaping a negative output, a memory for temporarily storing write data to be recorded on the disc, an output signal of the analog signal processor and an output signal of PIEL, and a clock corresponding to the rotational speed of the disc A clock generator for generating a signal; an encoder for encoding and outputting the recording data stored in the memory in synchronization with a clock of the clock generator; a switching unit for determining whether the output of the encoder is applied to the PEL or buffer memory; Locking the signal and outputting the signal to the clock generator if there is an output from the switching unit. A PEL, a buffer memory for temporarily storing the output of the encoder when the output is input through the switching unit, and a signal converter for converting the output of the buffer memory into a magnitude and a period of the current to be supplied to the optical pickup unit. A variable speed recording apparatus of an optical recording system, characterized in that. The variable speed recording apparatus of claim 1, wherein the optical pickup unit reads a wobble signal previously recorded on the disk.