Optical recording regeneration apparatus with compensation circu

Details Optical recording regeneration apparatus with compensation circu Optical recording regeneration apparatus with compensation circu

1994-11-22

1996-02-20

Young, W. R.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369116, 369 58, G11B 7125

Patent

active

054935490

ABSTRACT:
An optical recording regeneration apparatus with a compensation circuit is provided. In the apparatus, a recording state detection circuit detects the recording state of recorded data and generates state data indicative of the recording state. A modulation control circuit compares the state data with a specified value and generates the comparison results. A drive circuit adjusts the power level and/or the pulse width of the laser beam in accordance with the comparison results. Thus, the power level and/or the pulse width of the laser beam can maintain at an optimum value without being affected by variations in disk recording sensitivity resulting from temperature or other changes over time.

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patent: 5070495 (1991-12-01), Bletscher, Jr. et al.
patent: 5216660 (1993-06-01), Iimura

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