Electric power conversion systems – Current conversion – Using semiconductor-type converter
Patent
1998-07-13
1999-06-22
Nguyen, Matthew
Electric power conversion systems
Current conversion
Using semiconductor-type converter
315219, H02M 7537, H05B 3702
Patent
active
059148713
ABSTRACT:
A device for controlling the illuminance of a light source in order to quickly warm up the light source to a certain brightness for a scanning operation is disclosed. The device allows multi-stages of current to be provided for the light source by adjusting a capacitance therein. For a two-stage illuminance control before scanning operations, a current having an intensity greater than required for the normal scanning operation is provided for the light source to excite the brightness of the light source to exceed the certain brightness required for the scanning operation in the first stage, and a current for generating the desired brightness for the scanning operation substitutes for the exciting current to be provided for the light source in the second stage. Thereafter, the scanning operation is performed after a short period of brightness stabilization.
REFERENCES:
patent: 3938060 (1976-02-01), Kato et al.
patent: 4334301 (1982-06-01), Kanamaru
patent: 4745273 (1988-05-01), Szabo et al.
patent: 5189344 (1993-02-01), Rose
patent: 5367223 (1994-11-01), Eccher
Lin Ching Chang
Lin John
Lo Elaine H.
MacPherson Alan H.
Mustek Systems Inc.
Nguyen Matthew
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