Automatic antiglare rearview mirror

  • US 4,281,898 A
  • Filed: 02/07/1979
  • Issued: 08/04/1981
  • Est. Priority Date: 02/07/1979
  • Status: Expired due to Term
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First Claim
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1. A mirror mechanism for selectively producing an image of high or low brightness depending upon the intensity of incident light, comprising:

  • (a) support means;

    (b) a mirror assembly supported by the support means for pivotal motion between two predetermined operating positions to provide the high and low brightness images;

    (c) permanent magnet means secured to either of the support means and the mirror assembly;

    (d) electromagnet means secured to the other of the support means and the mirror assembly in opposed relationship to the permanent magnet means;

    (e) the electromagnet means including core means normally coacting with the permanent magnet means to hold the mirror assembly in a selected one of the operating positions;

    (f) sheets of magnetic rubber attached to at least one of said permanent magnet means and said electromagnet means to effect noise reduction;

    (g) a light sensitive element arranged to sense the intensity of light impinging on the mirror assembly; and

    (h) electric circuit means responsive to the sensing by said light sensitive element of a change in the intensity of the incident light, for energizing the electromagnet means for a preset length of time for causing the pivotal motion of the mirror assembly from one to the other of the operating positions by virtue of magnetic attraction and/or repulsion between the permanent magnet means and the electromagnet means;

    (i) whereby the energization of the electromagnet means is required only for moving the mirror assembly between the operating positions.

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