JPH0757378A - Optical disk recorder - Google Patents

Abstract

PURPOSE:To easily attain the recording in the proper state independently of the difference in the kind of disks caused by the recording material, etc. CONSTITUTION:The control information regarding a laser modulation system at the time of recording is stored by a control information storing means 20 in accordance with the kind of disks. The kind of disks of an optical disk to be recorded is discriminated by a discriminating means 22 for the kind of disks. By a recording control means 26, this discriminated information is inputted to read out the corresponding control information from the control information storing means 20, then contents of the control (recording power control, etc.) instructed by this control information are conducted, and the recording is made against the optical disk 10.

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 apparatus for recording information on an optical disk, and can easily perform recording in an appropriate state regardless of the kind of the disk depending on the recording material or the like.

[0002]

2. Description of the Related Art CD-WO as a recordable optical disk
There is a write-once (additional write) disc of the CD standard, which is used for recording music information. Various recording materials are used for the recording layer of a CD-WO disc.
One of them is a dye-based material. Even if the dye-based material is generally called, the required recording power (power of recording laser light, that is, recording sensitivity) differs depending on the type. On the other hand, the recording device is required to always be able to record in an appropriate state even if the material of the recording layer is different. Therefore, the recording power and other parameters (generally referred to as WRITE STRATEGY (laser modulation method) are used according to the type of disc used. .) Needs to be readjusted.

Conventionally, recording is performed when trial writing is performed by using a portion on the inner circumference side of the lead-in area of the optical disc to be recorded and reproduced to obtain the best reproduction signal. The power was selected, and this was decided as the recording power when actually recording. In the test writing, a test pattern composed of, for example, a combination of 11T-11T and 3T-3T is recorded while sequentially changing the recording power in steps of 0.3 to 0.5 mW. Next, this test-written test pattern is reproduced to obtain asymmetry (a parameter for evaluating the quality of the recording signal) from the reproduction waveforms of 11T-11T and 3T-3T for each recording power. Then, the recording power at which a desired asymmetry is obtained is selected from the above, and the recording power is set to this value for actual recording.

[0004]

With the conventional optical disk recording apparatus that determines the recording power by performing trial writing, it takes a lot of time to determine the recording power. In addition, if there is a parameter to be adjusted other than the recording power (for example, the recording start timing with respect to the recording signal, the recording end timing shift amount, the irradiation time correction amount, etc.), the user performs the trial recording to obtain the optimum state. Was difficult to set.

The present invention is intended to solve the above problems in the prior art and to provide an optical disk recording apparatus capable of easily recording in an appropriate state regardless of the kind of disk.

[0006]

The invention according to claim 1 is
A plurality of types of control information regarding the laser modulation method at the time of recording are stored according to the type of the disc, and the information regarding the disc type of the optical disc to be recorded is input,
The corresponding control information is read from the storage means, the control content instructed by the control information is executed, and recording is performed on the optical disc.

According to a second aspect of the invention, the disc type is further automatically discriminated and the information relating to the disc type is generated.

According to the third aspect of the invention, when the disc type is automatically discriminated, basic control information irrelevant to the disc type is stored, and when the disc type is not discriminated, this control information is stored. The basic control information is read out to perform control.

[0009]

According to the first aspect of the present invention, the control information relating to the laser modulation method such as the recording power for obtaining an appropriate recording state according to the disc type is stored and stored in accordance with the disc type used. Since it is read and used, an appropriate recording state can be easily adjusted.

According to the second aspect of the invention, the disc type is automatically discriminated and the control information relating to the corresponding laser modulation method is read out, so that the operation is further facilitated.

According to the third aspect of the invention, even when the disc type cannot be discriminated because the disc type is not registered, the basic control information can be used for recording.

[0012]

EXAMPLE An example of the present invention will be described. here,
A case of recording on a CD-WO optical disc having a recording layer made of various dye materials will be described. In FIG. 1, an optical disk 10 (CD-WO optical disk) is set on a turntable 11, rotated by a disk motor 12, and information is recorded and reproduced by a laser beam emitted from an optical head 14.

The recording signal corresponding to the data to be recorded is
If this is used as it is and the laser diode in the optical head 14 is driven to perform recording, pits may be formed long due to the heat storage amount due to the length of the immediately preceding pit portion or the length of the immediately preceding blank portion. However, it may be formed in a short length, or the pit start position and end position may be deviated from the normal position, which causes jitter during reproduction, which causes a read error. Therefore, the recording signal is passed through the recording signal correction means 16 to correct its rising timing, falling timing, pulse width, etc. according to the immediately preceding pit length, the immediately preceding blank length, and the like. The corrected recording signal is input to the laser generating means 18. The laser generating means 18 modulates a laser drive signal with a recording signal and outputs it, and drives a laser diode in the optical head 14 to emit a recording laser beam. The recording laser beam is applied to the recording layer of the optical disc 10 to form pits in the recording layer for recording.

The control information storage means 20 is composed of a ROM and stores control information (WRITE STRATEGY) relating to a laser modulation method such as recording power for obtaining an optimum recording state for each disc type and correction contents for recording signals. . The disc type discriminating means 22 discriminates the disc type set on the turntable 11 and outputs the discrimination information. When the optical disc 10 is set, the recording control means 26 inputs the disc type discrimination information from the disc type discriminating means 22, reads the control information for the disc type from the control information storing means 20, and corrects the recording signal. Recording is performed on the optical disc 1 by setting the correction content in the means 16 and the laser drive signal level (that is, recording power) in the laser generating means 18. As a result, it is possible to perform recording in which the optimum recording quality can always be obtained (that is, the asymmetry is a desired value or the like) regardless of the disc type difference.

A specific example of the discriminating method in the disc type discriminating means 22 will be described. (1) Disc identification method (1): method based on disc type information Lead-in (TOC) section or TO of optical disc 10
Data indicating the disc type is modulated and recorded in the ATIP signal in the test area inside C (normalized to be recorded at the time of disc manufacturing). As the data to be recorded,
Manufacturer's identification code number, disc type code number,
A code number or the like indicating a recording medium (recording material), which is used when the optical head 14 reads the lead-in portion as shown in FIG. According to this method, all individual disc types can be discriminated, and recording power, correction contents, etc. can be adjusted in detail. It is also possible to print similar information with a bar code or the like at the innermost circumferential position of the disc and read it with a bar code reader to perform similar control.

(2) Disc Discrimination Method (Part 2): Method Utilizing Disc Characteristics Table 1 shows the currently marketed CD-WO optical discs.

Table 1 Dye-based manufacturers used Type reflectance (%) Phthalocyanine A Company A-133 ^{(yellow green) (with bar code)} 〃 Company B B-1 31 Cyanine Company C Company C-1 20 ^{(deep) Green)} 〃 C 〃 C 218 〃 D company D -1 24 〃 E company E -1 22 In Table 1, the reflectance is He-Ne laser (wavelength 6
33 nm).

As shown in Table 1, the phthalocyanine type disc has a reflectance of about 30% or more and the cyanine type disc has a reflectance of 25% or less with respect to a wavelength of about 650 nm. It is possible to determine whether it is a cyanine system. When discriminating by the reflectance, for example, as shown in FIG. 1, a disc type discriminating unit 28 is arranged so as to face the recording surface of the optical disc 10,
The optical disc 1 emits light having a predetermined power with a wavelength of around 650 nm.
0, the reflected light is received, the reflectance is measured by the received light power, and the reflectance is 30% or more or 2
It is determined whether it is a phthalocyanine type or a cyanine type based on 0% or less.

The disc discriminating unit 28 is shown in FIG.
As shown in FIG. 2, a red laser diode (wavelength 680 nm) or a red light emitting diode (wavelength 600 to 700 nm) is used as the light source 30, and the emitted light is collimated by the lens 32 and passed through the beam splitter 34 to allow the optical disc 10 to travel. The recording surface can be irradiated with the reflected light, and the reflected light is bent by the beam splitter 34 so that the photodetector 36 receives the light and the received light power can be detected.

The recording control means 26 performs recording control by reading out any type of control information from the control information storage means 20 depending on whether the disc type judged is phthalocyanine type or cyanine type. Although it is not possible for a manufacturer to specify the discriminating method based on the reflectance, a considerable effect can be obtained only by adjusting the recording power and the correction content depending on the pigment system used.

According to Table 1, the disk A-1 of company A among the phthalocyanine type disks is printed with a bar code 38 for identifying the disk number at the innermost circumferential position of the recording surface as shown in FIG. Therefore, by detecting the presence or absence of the bar code 38, it is possible to discriminate between the disc A-1 of company A and the disc B-1 of company B, and it is possible to adjust the recording power and correction contents in more detail. When this method is used in combination with the discrimination method based on the reflectance, as shown in FIG. 1, the bar code reader 40 faces the innermost circumferential position of the disc recording surface.
Is placed and the barcode 38 (FIG. 3) is read. In addition, since the number of the disk B-1 manufactured by the company B is not in circulation, only the barcode 38 is used, and the barcode 3 is used.
It is also possible to discriminate the disc having the No. 8 as the disc A-1 of the company A and discriminating the disc having no barcode 38 as the cyanine disc.

By the way, the control information storage means 20 (R
The OM) is mounted (or provided by a ROM card or the like) at the stage of shipping the optical disk recording device from the manufacturer. If the stored data needs to be updated due to the release of a new disc, the version can be upgraded by replacing the ROM. Further, instead of upgrading the version by replacing the ROM, a RAM with a backup power source is prepared in the optical disc recording device as a user writable control information storage means (or can be mounted as a RAM card),
The user can write the control information on the new disc. In the writing procedure, for example, when a new disc is set and the disc type discriminating means 22 discriminates the disc type, the operator designates the address with the keyboard 24 of FIG. 1 and associates the discrimination information with the address. Then, the control information provided by the disc manufacturer for the disc is input using the keyboard 24 or the like, and RA
Write to the corresponding address of M. When the data is written in this way, if the corresponding disk is set thereafter, the disk type is determined, the control information is read from the corresponding address in the RAM, and the disk can be recorded using this.

Further, in case the disc type identifying means 22 cannot identify the disc type (for example, the type of the disc has not been registered yet), the control information storing means 20 generally stores basic control information ( That is, control information is stored so that a proper recording state can be obtained to some extent (not optimum for all disc types), and this basic control is automatically performed when the disc type is not discriminated by the disc type discriminating means 22. Information can also be read and used.

[0024]

[Modification] Although the disc type is automatically discriminated in the above-mentioned embodiment, the operator discriminates the disc type by himself / herself and inputs the discrimination information from the keyboard 24 by keying the discriminating information to the corresponding control information from the control information storing means 20. It can also be read and used.

In the above embodiment, the case of recording on a CD-WO optical disc has been described, but the present invention can be applied to recording devices for various types of optical discs (including rewritable optical discs). it can. Also, when it is necessary to control the power of the laser light for reproduction according to the disc type during reproduction, the present invention can be applied to perform reproduction.

[0026]

As described above, according to the first aspect of the invention, the control information relating to the laser modulation method such as the recording power for obtaining an appropriate recording state according to the disc type is stored and used. Since this is read and used according to the type of the disc to be used, an appropriate recording state can be easily adjusted.

According to the second aspect of the invention, the disc type is automatically discriminated and the control information relating to the corresponding laser modulation method is read out, so that the operation is further facilitated.

According to the third aspect of the invention, even when the disc type cannot be discriminated because the disc type is not registered, the basic control information can be used for recording.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing a specific example of the disc type discriminating unit in FIG.

FIG. 3 is a front view of an optical disc on which a barcode is printed.

[Explanation of symbols]

 10 Optical Disc 20 Control Information Storage Means 22 Disc Type Discriminating Means 26 Recording Control Means

Claims (3)

[Claims] 1. Control information storage means for storing a plurality of types of control information relating to a laser modulation method at the time of recording in accordance with the disc type, and information relating to the disc type of the optical disc to be recorded, and the corresponding control. An optical disk recording apparatus comprising: recording control means for reading information from the control information storage means, executing control contents instructed by the control information, and recording on the optical disk. 2. The optical disc recording apparatus according to claim 1, further comprising a disc type discriminating means for discriminating a disc type and generating information relating to the disc type. 3. The control information storage means stores basic control information irrelevant to the disc type, and the recording control means controls the basic control when the disc type discriminating means does not discriminate the disc type. The optical disc recording apparatus according to claim 2, wherein the information is read out and controlled.