Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Control of information signal processing channel
Reexamination Certificate
2000-01-20
2002-08-27
Young, W. R. (Department: 2653)
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Control of information signal processing channel
C369S047190, C369S047510
Reexamination Certificate
active
06442118
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an information recording and reproducing apparatus which records information onto a medium using a laser beam with an emission waveform controlled by the recording information, and reproduces information from the medium by use of a laser beam with a lower intensity than that of the laser beam used for recording. More particularly, the invention provides an optical disk drive with a circuit to generate a desired waveform for the laser beam.
SUMMARY OF THE INVENTION
According to an aspect of the present invention, an information recording and reproducing apparatus records information using a precise laser current waveform, and reduces undesired effects during reproduction operations, such as ID reproduction.
More particularly, the invention provides an information recording and reproducing apparatus, such as an optical disk drive, for recording information onto a recording medium while changing the laser emissions. The apparatus includes a movable optical pickup unit which has a modulator that incorporates data to be recorded onto the recording medium using a synchronizing clock, a recording waveform generator having a recording clock generator that generates a recording clock based on the synchronizing clock. The waveform generator changes the laser emissions based on the recording clock and the recording data. A controller is provided to control the modulator and the recording waveform generator. Preferably, the recording waveform generator is formed on a circuit board of the optical pickup unit, and the modulator and the controller are formed on a circuit board other than that of the optical pickup unit. The recording clock generator turns the recording clock on and off based on control by the recording controller.
REFERENCES:
patent: 5235422 (1993-08-01), Ido et al.
patent: 5943307 (1999-08-01), Takagi et al.
patent: 5956313 (1999-09-01), Maegawa et al.
patent: 6157603 (2000-12-01), Okubo et al.
patent: 6195325 (2001-02-01), Okanishi
patent: 6278567 (2001-08-01), Nagasawa
Asada Akihiro
Hoshino Takashi
Kaku Toshimitsu
Sekine Takehiko
Patel Gautam R.
Young W. R.
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