KR100696758B1 - Writing method of optical disc reader/writer - Google Patents

Abstract

The recording method of the optical recorder according to the present invention comprises the steps of: (a) when power is supplied to the optical recorder, checking the set read level power to determine output characteristics of the laser diode, and adjusting various offsets; ; (b) a disc is inserted and a write command is received; (c) performing Optimal Power Control (OPC) setting for the inserted disc and measuring the changed read level power during data recording for the OPC; (d) comparing the output characteristics of the laser diode obtained in step (a) with the read level power measured in step (c) to determine a compensation amount for the read level power; And (e) performing data writing to the disc using the compensated read level power.

Here, when the amount of compensation for the read level power is determined, the method may further include storing the compensated read level power in the memory. Also, in determining the output characteristic of the laser diode, the compensated read level power stored in the memory may be determined. I use it.

According to the present invention, in recording data into a disc inserted using an optical recorder, by compensating for read level power and recording data, it is possible to reduce the servo error gain that can be generated during recording. There is an advantage of eliminating the instability of the servo loop due to the reduction and performing stable recording.

Description

Recording method of optical record player {Writing method of optical disc reader / writer}

1 is a block diagram schematically showing a configuration of a general optical recorder.

2 is a flowchart showing a process of performing data recording in an optical recorder employing the recording method of the optical recorder according to the present invention.

<Explanation of symbols for the main parts of the drawings>

101 ... Disc 102 ... Optical Pickup

103 ... recording pulse generator 104 ... laser diode driver

105 ... Micom 106 ... Memory

107 ... RF signal amplification unit 108 ... signal processing unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recorder, and more particularly, in recording data onto a disc inserted using an optical recorder, by compensating for read level power to record data, which can be generated during recording. The present invention relates to a recording method of an optical recorder capable of relieving instability of a servo loop due to a reduction in servo error gain and performing stable recording.                         

In general, optical recording media have a read only memory (ROM) type, a write once read many (WORM) type, and a rewritable rewritable type, depending on whether repeat recording is possible. It is classified into three kinds such as possible type.

Here, the ROM type optical recording medium includes a compact disc (CD) ROM and a digital versatile disc (DVD) ROM, and the WORM type optical recording medium is a write once compact disc (CD-R). Recodable Compact Discs and Recordable Digital Versatile Discs (DVD-R).

In addition, freely rewritable discs include a rewritable compact disc (CD-RW) and a rewritable digital versatile disc (DVD-RAM).

On the other hand, the optical recorder stores data on the disk through a method of forming a pit by concentrating a high power laser on the recordable disk. However, in order to stably record data on the disc, servo control is required so that the laser beam focuses on the track and follows without leaving the track.

Here, this servo control is performed with reference to a servo error signal detected from the reflected light of the laser beam irradiated onto the disk. At this time, the magnitude of the detected servo error signal varies depending on the reflectance and state of the disk, the response characteristics of the light receiver, the intensity of the laser beam, and the like.

When recording to an optical disc similar to a CD-R, a laser of high power is output in an area where a pit is formed on the disc, and a read level laser in an area where no pit is formed. Output power. In addition, the servo at the time of data recording detects an error signal by sampling the reflected light of the portion irradiated with the laser at the read level power, and the magnitude of the reflected light is reduced by various factors. This reduction in the sampled signal adds to the anxiety of the servo loop during recording, thereby limiting stable recording.

In order to prevent such a phenomenon, conventionally, the servo loop is stabilized by using a method of adjusting the read level by a constant level in accordance with each recording speed and power. However, this method has a problem in that stability is limited because it does not flexibly cope with various discs, recording power, recording speed, and the like.

The present invention has been created in view of the above circumstances, and when recording data on a disc inserted using an optical recording / reproducing device, the data is recorded by compensating for read level power to generate data at the time of recording. It is an object of the present invention to provide a recording method of an optical recording / reproducing apparatus that can solve the instability of the servo loop by the reduction of the possible servo error gain and can perform stable recording.

In order to achieve the above object, the recording method of the optical recorder according to the present invention,

(a) checking the set read level power when the power is supplied to the optical recorder, identifying output characteristics of the laser diode, and adjusting various offsets;

(b) a disc is inserted and a write command is received;

(c) performing Optimal Power Control (OPC) setting for the inserted disc and measuring the changed read level power during data recording for the OPC;

(d) comparing the laser diode output characteristic obtained in step (a) with the read level power measured in step (c) to determine a compensation amount for the read level power; And

(e) using the compensated read level power, to perform data writing to the inserted disc.

In this case, when the compensation amount for the read level power is determined in step (d), the method may further include storing the compensated read level power in the memory.

In addition, in determining the output characteristic of the laser diode in the step (a), it is characterized in that it uses the compensated read level power stored in the memory.

According to the present invention, in recording data into a disc inserted using an optical recorder, by compensating for read level power and recording data, it is possible to reduce the servo error gain that can be generated during recording. There is an advantage of eliminating the instability of the servo loop due to the reduction and performing stable recording.

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

1 is a block diagram schematically showing the configuration of a general optical recorder.                     

Referring to FIG. 1, a general optical recording / reproducing apparatus includes a recording pulse generator 103 for generating an actual recording pulse by including auxiliary information from the microcomputer 105 in recording information transmitted from a host (not shown), and the recording. And a laser diode driver 104 for driving the laser diode included in the optical pickup 102 according to the recording pulse generated by the pulse generator 103 and the laser power level set by the microcomputer 105.

The general optical recorder includes an optical pickup 102 for detecting an optical signal reflected from the disk 101, an RF signal amplifier 107 for amplifying the RF signal detected at the optical pickup 102, and And a signal processor 108 for reproducing the RF signal amplified by the RF signal amplifier 107.

Next, a process of recording data by compensating for the read level power in the optical recorder having the above configuration will be described with reference to FIGS. 1 and 2. 2 is a flowchart showing a process of performing data recording in the optical recorder employing the recording method of the optical recorder according to the present invention.

First, when power is supplied to the optical recorder (step 201), the microcomputer 105 of the optical recorder reads the read level power value stored in the memory 106, for example, the EEPROM (Electrically Erasable Programmable Read-Only Memory). come. In addition, the microcomputer 105 outputs several levels of power and obtains a slope of the power setting criterion versus the output power (LD drive voltage, VRDC) in order to determine the laser diode output characteristic of the optical pickup 102. Accordingly, the microcomputer 105 makes adjustments to various offsets, and then enters idle mode to wait for reception of the next command (step 202).

On the other hand, when the disc 101 is inserted into the optical record player and a recording command is received from the host (not shown) (step 203), the microcomputer 105 searches for an OPC to find the optimum recording power for the inserted disc 101. Perform (Optimum Power Control). Since the actual recording is performed in this OPC operation, the microcomputer 105 measures the read level power that changes (decreases) during the recording (step 204).

Here, the read level power compensated during the OPC operation uses the read level power value read from the memory 106 when power is supplied. After the completion of the OPC, the microcomputer 105 determines the compensation amount for the read level power by referring to the laser diode output characteristic measured in the step 202 and the read level power value measured during the OPC in the step 204. (Step 205).

The amount of compensation of the read level power (compensated read level power) calculated in this way can be used as the set compensation amount when the OPC operation is performed later when another disk is inserted into the memory (EEPROM) 106. Store the compensated read level power value (step 206).

Then, the microcomputer 105 writes data to the disc 101 using the compensated read level power (step 207). By performing the write using the compensated read level power, it is possible to prevent the reduction of the servo error gain during the write.

 According to the recording method of the optical recorder according to the present invention as described above, in recording data to a disc inserted using the optical recorder, by recording the data by compensating read level power, There is an advantage that it is possible to solve the instability of the servo loop due to the reduction of the servo error gain that may occur during recording and to perform stable recording.

Claims (4)

(a) when power is supplied to the optical recorder, checking the set read level power to determine output characteristics of the laser diode and adjusting various offsets; (b) a disc is inserted and a write command is received; (c) performing Optimal Power Control (OPC) setting for the inserted disc and measuring the changed read level power during data recording for the OPC; (d) comparing the output characteristics of the laser diode obtained in step (a) with the read level power measured in step (c) to determine a compensation amount for the read level power; And (e) using the compensated read level power, performing data recording on the inserted disc. The method of claim 1, And if the compensation amount for the read level power is determined in the step (d), storing the compensated read level power in the memory. The method of claim 2, And the memory is an EEPROM (Electrically Erasable Programmable Read-Only Memory). The method of claim 1, In the step (a), the method for recording the output characteristics of the laser diode, characterized in that for using the compensated read level power stored in the memory.

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