Light source and image reading device using the same

Details Light source and image reading device using the same Light source and image reading device using the same

2005-05-31

2005-05-31

Tran, Thuy Vinh (Department: 2821)

Electric lamp and discharge devices: systems

Combined load device or load device temperature modifying...

Load device and periodic electric switch

C315S219000, C315S291000

Reexamination Certificate

active

06900593

ABSTRACT:
A light source of the invention includes: a cylinder having disposed therein a phosphor material that emits light by ultraviolet rays which are radiated due to discharge; a pair of internal electrodes disposed inside the cylinder; a pair of external electrodes a and b disposed outside the cylinder; and a lamp controller that switches between an external electrode lighting mode resulting from the application of a voltage to the pair of external electrodes and an internal electrode lighting mode resulting from the application of a voltage to the pair of internal electrodes, wherein the lamp controller controls, in the external electrode lighting mode, an electric potential VINwith respect to the pair of internal electrodes and an electric potential VHof the electrode of the higher electric potential of the pair of external electrodes to a condition where VIN>VHor VIN≈VH.

REFERENCES:
patent: 5914560 (1999-06-01), Winsor
patent: 6191539 (2001-02-01), Green
patent: 6509701 (2003-01-01), Rakhimov et al.
patent: 5-144412 (1993-06-01), None
patent: 6-141145 (1994-05-01), None
patent: 2000-106146 (2000-04-01), None
patent: 2000-174984 (2000-06-01), None
patent: 2003-087507 (2003-03-01), None

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