Rear view mirror

  • US 4,266,856 A
  • Filed: 01/09/1979
  • Issued: 05/12/1981
  • Est. Priority Date: 07/20/1978
  • Status: Expired due to Term
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First Claim
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1. A rear view mirror for a motor vehicle comprising(a) a housing including(1) a back plate portion (4);

  • and(2) a front frame portion (6) connected with said back plate portion to define a chamber, said housing containing a recess in the inner surface of the lower portion thereof, said recess extending parallel with said front plate portion;

    (b) a mirror (8) pivotally mounted within said housing chamber, the lower edge of said mirror being arranged within said housing recess, said mirror being operable to pivot between a normal position wherein said mirror is arranged adjacent and generally parallel to said front frame portion, and an anti-glare position wherein said mirror diverges from said front frame portion in the direction of the upper edge of said mirror; and

    (c) means for pivoting said mirror between said normal and anti-glare positions, said pivoting means including(1) means (20) for biasing said mirror toward its normal position;

    (2) a unitary electrical assembly (12) mounted on said back plate portion within said housing, said assembly containing an electrical circuit including(a) a printed circuit board (104,

         161);

    (b) a photosensor (14) mounted on said board for sensing light incident on said mirror,(c) a solenoid coil (16) connected with said photosensor;

    (d) means (168,

         169) for supplying a voltage across said photosensor, said photosensor producing a voltage output corresponding with said incident light;

    (e) reference voltage means (82) connected with said voltage supply;

    (f) operational amplifier means (177) for comparing the photosensor output voltage with said reference voltage; and

    (g) transistor means (179) responsive to the output of said operational amplifier for controlling the flow of current through said solenoid coil; and

    (3) metallic plate means (164) mounted on the rear portion of said mirror, whereby when a sufficient amount of light strikes said photosensor, said solenoid coil generates a magnetic field which attracts said metallic plate means to pivot said mirror to its anti-glare position.

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