JPH06176364A - Device for recording and reproducing optical disk - Google Patents

Abstract

PURPOSE:To stably record data by enlarging laser outgoing power at a recording time than a time at the time of recording with a normal rotational speed at the time of recording with the speed exceeding the normal rotational speed. CONSTITUTION:A signal recorded on an optical disk 1 is read out to be sent to a preamplifier 4 by an optical pickup 2 at a reproducing time. The strength of a laser beam is changed according to recording information sent from the preamplifier 4 at a recording time. When the optical disk 1 is rotated by the rotation of a disk motor 3, the output signal of a divided photodetector in the optical pickup 2 is amplified by the preamplifier 4, and matrix processing taking out the signal of the sum/difference is performed, and the controlling signal of the disk motor 3, the address signal of the disk, the tracking and the focusing control signals of the optical pickup and the regenerative signal of the recording information are generated to be sent to a servo circuit 6 and a signal processing circuit 5. The signal processing circuit 5 is controlled by a controller 7, and by the circuit 5, the regenerative signal of the recording information sent from the preamplifier 4 is decoded, and the information from the controller 7 is sent to the preamplifier 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk recording / reproducing apparatus, and more particularly to a laser power setting method for double speed recording.

[0002]

2. Description of the Related Art In an MD (mini disk) recording / reproducing apparatus which is an optical disk recording / reproducing apparatus utilizing the laser power of a conventional optical pickup, data regarding recording power is included in MD lead-in information. The optical disk was recorded by setting the recording power according to the data.

Further, in a CD-R device which records information by forming a pit train on the surface of an optical disk by laser power, since there is no data regarding the recording power in the lead-in information, the power calibration area on the disk. In addition, after recording stepwise with each laser power, the position was reproduced, and the power with which the error rate was the best was set as the laser power at the time of recording.

However, the above-mentioned one sets the normal rotation speed in order to set the recording power by the data of the recording power at the normal rotation speed and set the recording power by the power calibration at the normal rotation speed. In double-speed recording or the like in which recording is performed by rotating at a speed exceeding the above, there is a drawback that the time / energy product per unit area irradiated on the disk is insufficient and the reproduction error rate of recorded information is deteriorated.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide double-speed recording in which recording is performed by rotating at a speed exceeding a normal rotation speed. An object of the present invention is to provide an optical disk recording / reproducing device in which the time-energy product per unit area irradiated on the disk is not insufficient.

[0006]

An optical disk recording / reproducing apparatus of the present invention is an optical disk recording / reproducing apparatus capable of switching an optical disk between a normal rotation speed and a rotation speed exceeding the normal rotation speed for recording. When the recording is performed at a speed exceeding the rotational speed of, the laser emission power at the time of recording is set to be larger than that at the normal rotational speed.

Further, in the optical disk recording / reproducing apparatus, the laser emission power when recording at a speed exceeding the normal rotation speed is determined by the result of recording power calibration performed by rotating the disk at that speed. .

[0008]

The temperature at which the optical disk is heated by the laser power and rises is approximately proportional to the time-energy product per unit area of the laser power applied to the disk. Also,
The optimum temperature for recording an optical disk by magnetization, phase change, or pit formation is almost constant. To record the optical disk at a speed exceeding the normal rotation speed, the laser emission power is set to the optimum temperature. Needs to be larger than when is recorded at the regular rotation speed.

According to the optical disk recording / reproducing apparatus of the present invention, when recording at a speed exceeding the normal rotation speed, the laser emission power at the time of recording is made larger than when recording at the normal rotation speed. In, the optical disk heating temperature can be optimized, and the reproduction error rate of recorded information can be improved.

Further, if the laser emission power at the time of recording at a speed exceeding the regular rotation speed is set by rotating the disk at that speed to perform recording power calibration, the heating temperature of the optical disk will be more accurate and optimum. It can be the temperature.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An optical disk recording / reproducing apparatus according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an optical disk recording / reproducing apparatus according to an embodiment of the present invention. In the figure, 1 is an optical disc for recording information,
A groove (guide groove) is carved in a spiral shape. Information is recorded and reproduced while tracing this groove.
The groove is wobbled (waviness), and the wobble includes information related to recording on the disc, a disc rotation control signal, and an address signal.

FIG. 2 shows the arrangement of each area of the optical disc 1. There is a clamping area outside the center hole, which is used to clamp the turntable. Lead-in outside the clamping area
The area is read-only, and disk recording related information (recording power, recording area position, U-TOC (user's stock) position, power calibration position, etc.) is written.

The outside of the lead-in area is a recordable area, the power calibration area is a place where the laser power of the optical pickup is determined by trial writing, and the U-TOC is each recorded in the program area. Song TNO and sled start and end addresses,
It is a place to record additional information. The program area is a place where the user can record an arbitrary music signal.

Recording is performed by the intensity of the laser beam of the optical pickup which irradiates the information recording layer of the disc. The information recording layer has a different reflectance between amorphous (recorded state) and crystalline (erased state). Amorphous is formed by abruptly initiating the molten state, and crystalline is formed by keeping the temperature above the crystallization temperature for a certain period of time. The difference in reflectance between the amorphous (recorded state) and the crystalline (erased state) formed in this way is associated with information of 0 and 1, and the information is reproduced by the light receiving element of the optical pickup.

Reference numeral 2 shown in the figure is an optical pickup, which sends a signal recorded on the optical disk 1 to a read preamplifier 4 during reproduction. At the time of recording, the intensity of the laser light is changed according to the recording information sent from the preamplifier 4.

The disc motor 3 mounts the optical disc 1 on a turntable and drives it to rotate. The preamplifier 4 amplifies the output signal of the divided light receiving element of the optical pickup 2 and performs matrix processing for extracting a sum signal and a difference signal, and a disc motor control signal, a disc address signal, an optical pickup tracking and focusing control signal. And a reproduction signal of recorded information is generated and sent to the servo circuit 6 and the signal processing circuit 5.

The preamplifier 4 further receives the information signal to be recorded on the disc from the signal processing circuit 5 during recording and controls the laser power of the optical pickup 2. In addition, in response to an instruction from the controller 7, it controls the turning on and off of the laser.

The signal processing circuit 5 is controlled by the controller 7 to decode the reproduction signal of the recording information sent from the preamplifier 4 to restore the reproduction data, and at the same time, to control the rotation of the disk motor 3 by the control signal sent from the preamplifier 4. A signal is generated and sent to the servo circuit 6.

The signal processing circuit 5 further encodes recording data at the time of recording, receives recording information sent from the controller 7, and sends the information to the preamplifier 4. In addition, the controller 7 sends information engraved on the disk and information necessary for control to the controller 7.

The servo circuit 6 controls the tracking and focus of the optical pickup 2 by the signal from the preamplifier 4, and controls the rotation of the disk motor 3 by the signal from the signal processing circuit 5. In addition, the controller 7 sends a signal indicating the control state and receives a control operation command for the optical pickup 2 and the disc motor 3 from the controller 7.

The controller 7 receives a user command from a key matrix (not shown), receives information from the signal processing circuit 5 and the servo circuit 6, and outputs a signal for controlling the system to the preamplifier 4, the signal processing circuit 5, and the signal processing circuit 5. Send to the servo circuit 6. Further, the TNO of the disc, additional information, and time information are displayed on a display device (not shown).

Next, the optical disk recording operation of the above apparatus will be described. When recording at a regular disc rotation speed, the controller 7 instructs the preamplifier 4, the signal processing circuit 5 and the servo circuit 6 to move the optical pickup 1 to the lead-in area of the disc for reproduction and perform disc recording. Related information (recording power, recording area position, U
-TOC position, power calibration position, etc.) is read.

The controller 7 receives these information and issues a command to the signal processing circuit 5 and the servo circuit 6 to search for the U-TOC position to reproduce the U-TOC information and to send the reproduced information to the controller 7. .

The controller 7 determines the recordable position of the recording area based on the U-TOC information and causes the signal processing circuit 5 and the servo circuit 6 to search the position. Then, a command is issued to the preamplifier 4 so as to obtain the recording power engraved on the disk, and a command is issued to the signal processing circuit 5 and the servo circuit 6 to start recording.

Next, the case of recording at a double speed exceeding the regular rotation speed will be described. In that case, the controller 7 instructs the preamplifier 4, the signal processing circuit 5, and the servo circuit 6 to set the double speed operation. As in the case of the normal rotation speed, the controller 7 instructs the preamplifier 4, the signal processing circuit 5 and the servo circuit 6 to read the disk recording related information.

The controller 7 receives these information and issues a command to the signal processing circuit 5 and the servo circuit 6 to search the power calibration area. After the search, the preamplifier 4 is instructed to gradually increase the laser power from the recording power recorded on the disc, and the signal processing circuit 5 and the servo circuit 6 are recorded with the data in the power calibration area. Issue a command to.

After this recording is completed, the controller 7 instructs the preamplifier 4, the signal processing circuit 5 and the servo circuit 6 to reproduce the data recorded in the power calibration area.

The controller 7 receives the address and error correction information at that time during the reproduction of the data in the power calibration area, calculates the data, and calculates the laser power when the address having the good error rate is recorded in the internal memory. Store in.

Next, the controller 7 instructs the preamplifier 4, the signal processing circuit 5 and the servo circuit 6 to perform the U-TOC.
The area is reproduced, the recordable position of the recording area is determined based on the U-TOC information, and the signal processing circuit 5 and the servo circuit 6 are searched for the position. Then, a command is issued to the preamplifier 4 so that the laser power at the time of recording becomes the power stored in the memory, and a command is issued to the signal processing circuit 5 and the servo circuit 6 to start recording.

The embodiment is configured as described above, but the invention is not limited to this. For example, instead of determining the recording power at the time of double speed recording by calibration, a predetermined value is set to the recording power engraved on the disc. Alternatively or additionally, the recording power may be set by increasing it at a predetermined rate.

[0031]

According to the optical disk recording / reproducing apparatus of the present invention, since the laser emission power is higher than that in normal recording during double speed recording, the thermal energy applied per unit area of the disk is equal to that during normal recording. Therefore, it is possible to obtain an effect that recording is performed stably.

[Brief description of drawings]

FIG. 1 is a block diagram showing an optical disk recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram showing an area of an optical disc used in the optical disc recording / reproducing apparatus.

[Explanation of symbols]

 1 optical disk 2 optical pickup 3 disk motor 4 preamplifier 5 signal processing circuit 6 servo circuit 7 controller

Claims (2)

[Claims] 1. An optical disk recording / reproducing apparatus capable of switching an optical disk between a normal rotation speed and a rotation speed exceeding the normal rotation speed for recording, when recording at a speed exceeding the normal rotation speed. An optical disk recording / reproducing apparatus configured so that the laser emission power at that time is higher than that at the time of recording at a regular rotation speed. 2. The optical disk recording / reproducing apparatus according to claim 1, wherein the laser emission power for recording at a speed exceeding the normal rotation speed is determined by the result of recording power calibration performed by rotating the disk at that speed.