IMPULSE-OPERATED, DAY-NIGHT, REAR VIEW MIRROR

  • US 3,746,430 A
  • Filed: 09/15/1971
  • Issued: 07/17/1973
  • Est. Priority Date: 09/15/1971
  • Status: Expired due to Term
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First Claim
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1. A mirror having a reflective panel which is movable between two stable positions for providing a relatively bright reflected image at a viewing position when in one of said positions and a relatively weak reflected image at said viewing position when in the other of said positions, electric motor means for moving said panel to said positions, a first photo-resistor means including normally non-conductive solid state bistable switch circuit means responsive only to decreases of light intensity to values below a predetermined level, said bistable switch circuit including solely capacitive coupling circuits connected between said bistable switch circuit means and said motor means, for only impulsively energizing said motor means in response to change of state of said bistable switch circuit to drive said reflective panel to said one position and responsive to increases of light intensity above said predetermined level for only impulsively energizing said motor means for moving said panel to said other position, and a second photo-resistor means responsive to steady state ambient light intensity above a predetermined intensity for inhibiting said first photo-resistor means and thereby maintaining said reflective panel in said one position.

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