Brightness sensor

Details Brightness sensor Brightness sensor

2011-04-05

2011-04-05

Philogene, Haissa (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

C315S291000, C315S169300, C315S169100, C315S150000, C313S502000, C313S506000, C345S207000

Reexamination Certificate

active

07919935

ABSTRACT:
An electroluminescent (EL) element is connected to the power supply and is intermittently operated as a lighting device and as a brightness sensor. For this purpose, the processing unit induces the controlled AC voltage source to reduce the voltage for a short period. The current intensity is measured by current measuring devices and the corresponding measuring signal is digitized using the analog/digital converter (A/D). A processing unit uses the signal and the effective voltage to determine, by means of empirical calibration data stored in the memory or by using a calibration function, the brightness, i.e. the luminance of the light that is incident on the EL element. The processing unit associates, using desired values stored in the memory, the detected brightness with an operating voltage level which ensures the desired emission brightness of the EL element when operated as a lighting device. Optionally, the determined operating voltage is corrected in order to take into consideration any brightness loss of the EL element caused by aging. The optionally corrected value is output via the control channel as the desired operating voltage and is maintained by the power supply unit until the next measuring interval.

REFERENCES:
patent: 4295148 (1981-10-01), Marine et al.
patent: 5093698 (1992-03-01), Egusa
patent: 5097299 (1992-03-01), Donhowe et al.
patent: 5349269 (1994-09-01), Kimball
patent: 5747938 (1998-05-01), Beard
patent: 5869930 (1999-02-01), Baumberg et al.
patent: 6452576 (2002-09-01), Van Velzen et al.
patent: 6664744 (2003-12-01), Dietz
patent: 6756952 (2004-06-01), Decaux et al.
patent: 198 25 435 (1999-12-01), None
patent: 695 17 642 (2001-02-01), None
patent: 699 08 309 (2004-04-01), None
patent: 0 704 912 (1996-04-01), None
patent: 0 838 975 (1998-04-01), None
European Office Action dated May 31, 2010 with English translation of relevant parts.
Paul Dietz et al., “Very Low-Cost Sensing and Communication Using Bidirectional LEDs,” Mitsubishi Electric Research Laboratories, Jul. 2003, pp. 1-19, XP007913121. (European OA).

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