G - Physics
02
B
88/113.13
G02B 17/00 (2006.01)
Patent
CA 1261659
ABSTRACT OF THE DISCLOSURE A day\night rearview mirror comprises an optical medium which is electrically driven between transmissive and opaque states. The mirror comprises a housing containing a circuit board assembly over which a mirrored reflecting sur- face is disposed. The mirrored reflecting surface is in turn overlaid by an optical transmission plate containing the optical medium. The transmission plate, mirror and circuit board are retained on the housing by means of a bezel. Electrical con- ductivity from the circuit board to the transmission plate is provided by helical coiled spring conductors which are con- veniently supported in sleeves integrally formed with a retain- ing frame for the mirrored reflecting surface of the mirror. The circuit board contains a circuit for controlling the optical transmission plate and suitable controls which are accessible to the user to adjust certain operational characteristics of the mirror assembly. It also includes a pair of photodetectors forming sensors which sense general ambient lighting conditions and incident light from the field of view, respectively. The sensors are coupled in electronic input circuits to a logic gate. The output of the logic gate controls the optical trans- mission plate. The transmission plate is forced to an opaque condition only when both a nighttime ambient condition is sensed and there are also bright lights from the field of view incident upon the the mirrored reflecting surface. The circuits impose cer- tain timing requirements on changes in sensed conditions so that the mirror does not change state in response to momentary departures from generally prevailing conditions.
500883
C-D Marketing Ltd.
Macrae & Co.
LandOfFree
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