Control circuit for an automatic rearview mirror

Details Control circuit for an automatic rearview mirror Control circuit for an automatic rearview mirror

1988-04-05

1989-12-12

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250214AL, H01J 4014

Patent

active

048869600

ABSTRACT:
The invention provides an automatic rearview mirror system (10) for a vehicle comprising a reflective element (22) actuatable between at least two different reflective conditions. The system includes a forward light sensor (11) to detect light forward of the vehicle and a rear light sensor (12) to detect light rearward of the mirror. A control circuit means (14,16) is coupled to the reflective element (22), the forward light sensor (11) and the rear light sensor (12). The control circuit causes the reflective element to assume a reflective state dependent upon the output of the forward and rear light sensors. The control circuit includes means for modifying the output of the forward light sensor (11) to cause a reduction in the sensitivity of the mirror.

REFERENCES:
patent: 3601614 (1971-08-01), Platzer
patent: 4443057 (1984-04-01), Bauer et al.
patent: 4572619 (1986-02-01), Reininger et al.
patent: 4580875 (1986-04-01), Bechtel et al.
patent: 4603946 (1986-08-01), Kato et al.
patent: 4669825 (1987-06-01), Itoh et al.
patent: 4676601 (1987-06-01), Itoh et al.
patent: 4690508 (1987-09-01), Jacob
patent: 4697883 (1987-10-01), Suzuki et al.
patent: 4701022 (1987-10-01), Jacob
patent: 4793690 (1988-12-01), Gahan et al.

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