Optical disk apparatus and control method thereof

Details Optical disk apparatus and control method thereof Optical disk apparatus and control method thereof

2007-03-27

2007-03-27

Psitos, A M (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S116000

Reexamination Certificate

active

10781711

ABSTRACT:
In an optical disk apparatus, recording information by irradiating a laser light from a laser diode LD upon a recording surface thereof, while rotationally driving an optical disk by means of a spindle motor207, being provided with a front monitor diode FMD for monitoring the laser light from the LD therein, a controller portion205detects deterioration of the laser diode, including the kink phenomenon, in particular, of loosing the linearity in the driving characteristic thereof caused due to driving under the condition of high temperature, by comparing a laser light output detected by the FMD to that, which is detected previously, within recording operation of the apparatus, and it also makes controls to lower the rotation velocity of the optical disk. This is suitable, in particular, to the optical disk apparatus of a super or ultra-thin type.

REFERENCES:
patent: 5274622 (1993-12-01), Kono
patent: 6671248 (2003-12-01), Miyabata et al.
patent: 2000-206435 (2000-07-01), None
patent: 2002-16315 (2002-01-01), None

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