Optical disc apparatus with regulation of recording velocity and laser power
A recording power, optical disc technology, applied in data recording, optical recording heads, optical recording systems, etc., can solve problems such as unsatisfactory recording state quality
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example 1
[0108] In the embodiments described above, CAV recording was not performed until the maximum recording speed consistent with the test recording results was reached. After the maximum speed recording is achieved, a CLV recording is performed. However, CLV recording can be performed at the maximum recording speed or a lower speed from the beginning.
[0109] In addition, the maximum recording speed obtained above is 12 times speed, but the user commands CLV recording at 16 times speed. In this case, the user is notified that satisfactory recording cannot be obtained at 16x speed CLV recording, and the user can be made to set the recording speed again. In addition, when the recording speed set by the user is higher than the maximum recording speed obtained above, the maximum recording speed or a lower recording speed can be automatically set without the user setting the speed again as described above. In this case, estimate the time required for recording at the changed / set rec...
example 2
[0111] In addition, in the above-mentioned embodiment, the maximum recording speed at which satisfactory recording can be obtained can be obtained, however, it is also necessary to consider the situation that the recording level is damaged when recording at a low speed (as shown in FIG. Values are subject to a range of β values within the preferred range β m reduced case). In this case, as shown in FIG. 11, a certain speed value (10 or more in the illustrated example) indicated by the β preferred value information can be obtained as the minimum recording speed V min .
[0112] As shown in Fig. 12, at the time of normal recording with the minimum recording speed obtained in this way, CLV recording is performed at a recording speed greater than the obtained minimum recording speed (4x speed in the example), and can be switched To CAV recording, the linear speed of CAV recording exceeds the minimum recording speed at this time.
example 3
[0114]In addition, in this embodiment, the recording speed is obtained based on the value of β, but it is not limited thereto, and the recording speed can also be obtained based on the writing laser power value. In this case, the controller 16 obtains the relationship between the lower writing laser power value and the C1 error value shown in FIG. 13A from each of a plurality of recording speeds of the C1 error value supplied from the C1 error detection circuit 23 . Here, as shown in FIG. 13A, when the writing laser power value is used as a reference instead of the β value, the recording power value also increases with a higher recording speed. Therefore, the recording speed as a reference is obtained according to the writing laser power value. Afterwards, each speed obtained by OPC and the characteristics of the optimum writing laser power values PL1, PL2, PL3 are used to obtain the upper limit values PJ1', PJ2', PJ3' and lower limit values PK1', PK2 of the power values...
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