Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Reexamination Certificate
2006-10-17
2006-10-17
Le, Hoanganh (Department: 2821)
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
C315S307000, C315S291000
Reexamination Certificate
active
07122975
ABSTRACT:
The invention relates to a light source unit control method and a light source control unit, and a light source unit comprising a filament lamp with a characteristic of having a light quantity changing almost in proportion to a control voltage, which comprise: a current detection sensor connected in series to the lamp; a multiplication circuit for generating a voltage Vwproportionate to the product of a terminal voltage V of the lamp and an output voltage V1of said current detection sensor; a multiplication circuit for generating a voltage VWWproportionate to the square root of said voltage VW; an error amplifier circuit for controlling an error to the minimum by comparing the output voltage VWWof said multiplication circuit and the control voltage V1and a constant voltage power source unit for supplying an electric power to the filament lamp, the unit being connected to an output terminal of the error amplifier circuit, wherein the light quantity of the lamp is controlled by controlling the control voltage.
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Knobbe Martens Olson & Bear LLP
Le Hoang-anh
Le Tung
Sumita Optical Glass Inc.
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