Method and apparatus for varying laser intensity level

Details Method and apparatus for varying laser intensity level Method and apparatus for varying laser intensity level

1985-04-05

1987-09-22

Richardson, Robert L.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369100, 369121, 346 76L, G11B 700

Patent

active

046959947

ABSTRACT:
This invention relates to the field of radiant energy information storage devices and provides for a low reading level, an intermediate level and a high writing level of power from the radiation source so as to lower the overall power requirements of the radiation source and increase availability and accuracy of the verification read directly after or during writing, without causing unwanted damage to the information recording media. A circuit is described to accomplish this. The circuit basically employs two power sources, one for reading power, one for writing power and an intermediate ("Pedestal") circuit to employ a portion of the writing power source's power to provide the step-up in power to the intermediate level.

REFERENCES:
patent: 4122409 (1978-10-01), Marlett et al.
patent: 4509156 (1985-04-01), Ohara et al.
patent: 4562567 (1985-12-01), Frankfort et al.

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