Optical: systems and elements – Glare or unwanted light reduction – With mirror
Patent
1995-04-06
1996-01-23
Dzierzynski, Paul M.
Optical: systems and elements
Glare or unwanted light reduction
With mirror
359601, 359604, 359265, 359267, 359884, 250214AL, 250205, G02B 2700, G02B 508, G02F 115, G01J 120
Patent
active
054869528
ABSTRACT:
In a device for driving an EC antiglare mirror in which reflectivity is variably controlled by an EC element, a surrounding light quantity detection circuit detects quantity of light surrounding a vehicle. A rear light quantity detection circuit detects quantity of light in the rear of the vehicle. An oscillation circuit is constructed so that duration of an "H" level of an oscillation signal and duration of an "L" level of the oscillation signal are individually controlled. An inversion period control circuit variably controls duration of one of the "H" and "L" levels of the oscillation signal generated by the oscillation circuit in response to light quantity detected by the surrounding light quantity detection circuit and also variably controls duration of the other level in response to light quantity detected by the rear light quantity detection circuit. An EC element drive circuit inverts, in accordance with the level of the oscillation signal, the polarity of drive voltage supplied from a drive power source and applies the inverted voltage to the EC element and thereby controls the amount of coloration in accordance with duty factor of the oscillation signal.
REFERENCES:
patent: 4676601 (1987-06-01), Itoh et al.
patent: 4793690 (1988-12-01), Gahan et al.
patent: 4886960 (1989-12-01), Molyneux et al.
patent: 4896030 (1990-01-01), Miyaji
patent: 5148014 (1992-09-01), Lynam et al.
patent: 5285060 (1994-02-01), Larson et al.
Hattori Michiaki
Nagao Mitsuyoshi
Sato Hidenori
Dzierzynski Paul M.
Murakami Kaimeido Co. Ltd.
Sikd-er Mohammad Y.
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