Single sensor adaptive drive circuit for rearview mirror system

Details Single sensor adaptive drive circuit for rearview mirror system Single sensor adaptive drive circuit for rearview mirror system

1991-11-19

1993-03-09

Ben, Loha

Optical: systems and elements

Glare or unwanted light reduction

With mirror

359265, 359601, 250200, 250206, G02B 1700

Patent

active

051930293

ABSTRACT:
An automatic rearview mirror system having a reflective element that is actuatable between at least two different reflective conditions by a control that discriminates between glare-causing and nonglare-causing light simultaneously sensed by a single light sensor. The control includes a processor that is more responsive to decreasing levels of light than to increasing levels of light to produce a signal that is indicative of the slow-transient characteristic of the light sensed by the single light sensor. The processor may include a very slow signal processor that is always operative and a somewhat faster-slow signal processor, which may be selectively inhibited when the mirror is fully colored, or when a differential circuit indicates that the difference between the glare and the non-glare light sensed by the light sensor exceeds a predetermined level. The differential circuit may additionally limit the differential between the glare and the nonglare lights sensed by the light sensor.

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