Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1995-12-21
1998-01-13
Ben, Loha
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369106, 369 4425, 372 38, G11B 700
Patent
active
057086478
ABSTRACT:
A laser power supply control circuit may, when the power supply is initially turned on, temporarily permit an excessive supply voltage which may damage the laser. To prevent that, but without restricting the operating range or speed of response of the control circuit, the invention provides a sensing circuit for deriving a sensor signal indicative of a change in the loop gain of the control circuit when it departs from its normal operating mode. The sensor signal is used to prevent the power supply control signal from increasing excessively after a temporary reduction in supply voltage, but permits the control signal to operate substantially immediately when the supply voltage returns to its normal operating range.
REFERENCES:
patent: 4685097 (1987-08-01), van der Put
patent: 4785443 (1988-11-01), Minami et al.
patent: 4819241 (1989-04-01), Nagno
patent: 5119360 (1992-06-01), Minakuchi
patent: 5146449 (1992-09-01), Shimozawa
patent: 5153871 (1992-10-01), Minakuchi
patent: 5170389 (1992-12-01), Numata et al.
Bierhoff Martinus P. M.
Van Mil Job F. P.
Ben Loha
Eason Leroy
U.S. Philips Corporation
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