Light-emission controlling apparatus

Details Light-emission controlling apparatus Light-emission controlling apparatus

1997-08-25

1999-09-07

Wong, Don

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315224, 315225, 315362, H05B 3702

Patent

active

059491981

ABSTRACT:
A light-emission controlling apparatus including an electric discharge lamp (106) which can emit light, a unit for detecting the light-emission state of the electric discharge lamp (106), such as a light-emission time integrating unit (107) for measuring the integral of the length of time that the electric discharge lamp (106) has emitted light, a comparing unit (1082) for comparing the integral of the length of time that the electric discharge lamp (106) has emitted light which is measured by the light-emission time integrating unit (107) to a reference value, and a light-emission mode selecting unit (1083) for selecting either a first light-emission mode or a second light-emission mode according to a comparison result from the comparing unit (1082) so as to cause the electric discharge lamp (106) to emit light in one light-emission mode selected.

REFERENCES:
patent: 5111118 (1992-05-01), Fellows et al.
patent: 5589742 (1996-12-01), Ueda
patent: 5604406 (1997-02-01), Gaus
patent: 5604411 (1997-02-01), Venkitasubrahmanian et al.
patent: 5646484 (1997-07-01), Sharma et al.
patent: 5663613 (1997-09-01), Yamashita et al.
patent: 5696431 (1997-12-01), Giannopoulos et al.

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