Light-reflectivity controller for use with automotive rearview m

Details Light-reflectivity controller for use with automotive rearview m Light-reflectivity controller for use with automotive rearview m

1988-02-29

1990-01-23

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

350357, G01J 120

Patent

active

048960306

ABSTRACT:
The light reflectivity control for use with an automotive rearview mirror according to the present invention has a first and second photosensors to detect the brightness of the surroundings including the front of a car in which the inside rearview mirror is equipped and that of the surroundings including the rear of the car, respectively. These photosensors deliver output signals in inverse proportion to the respective brightnesses of the surroundings of the car. The output signals are supplied to a first and second comparators each having at least a reference value predetermined correspondingly to the brightness of the surroundings, in which the output signals are compared with the reference values, respectively. Based on the signal including the information concerning the brightness of the surroundings including the front and rear, respectively, of the car and that are delivered from the comparators, voltages for application to the electrochromic elements and then the electrochromic elements are connected. Thereby, the voltage for application to the electrochromic elements are automatically and stepwisely correspondingly to the brightness of the surroundings of the car.

REFERENCES:
patent: 4293194 (1981-10-01), Takahashi
patent: 4443057 (1984-04-01), Bauer et al.
patent: 4512637 (1985-04-01), Ballmer
patent: 4669825 (1987-06-01), Itoh et al.
patent: 4750816 (1988-06-01), Ito et al.

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