Peter A Howard

US Patent:

46959947, Sep 22, 1987

Filed:

Apr 5, 1985

Appl. No.:

6/720218

Inventors:

Christiaan Steenbergen - Colorado Springs CO
Peter G. Howard - Eugene OR
Roger R. Bracht - Colorado Springs CO
Henk van der Put - Colorado Springs CO

Assignee:

Laser Magnetic Storage International Company - Colorado Springs CO

International Classification:

G11B 700

US Classification:

369 54

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.