Vehicular rear viewing device

  • US 3,909,117 A
  • Filed: 08/23/1973
  • Issued: 09/30/1975
  • Est. Priority Date: 08/25/1972
  • Status: Expired due to Term
  • ×
    • Pin
First Claim
Patent Images

1. A vehicular rear viewing device for producing an erect image of the scene rearwardly of the device comprising, in combination, a first plane mirror having a rear reflecting surface to reflect an image of said scene, a second plane mirror having a front reflecting surface which is in angled vis-a-vis relation to the reflecting surface of said first plane mirror for forwardly redirecting the image reflected from the first plane mirror, and a third plane mirror having a rear reflecting surface which is in angled vis-a-vis relation to the reflecting surface of the second plane mirror and to a driver positioned relative to the third plane mirror for rearwardly reflecting the image from the second plane mirror toward the driver, wherein the second plane mirror is a beam splitting mirror by which the image coincident thereupon is partly reflected from its reflecting surface and partly transmitted therethrough, said second plane mirror comprising a first zone on which only the image from said scene is incident, a second zone on which the image from said scene and the image from said first plane mirror are incident, and a third zone on which only the image from said first plane mirror is incident, said first zone having a semi-transparent coating of a thickness which provides a transmittance higher than a reflectance in said first zone, said second zone having a semitransparent coating of a thickness which provides a transmittance and a reflectance substantially equal to each other in said second zone, said third zone having a semi-transparent coating of a thickness which provides a reflectance higher than a transmittance in said third zone, said transmittance of said first zone being substantially equal to said reflectance of said third zone.

View all claims
    ×
    ×

    Thank you for your feedback

    ×
    ×