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Vehicle rear-view mirror with wide viewing angle and reduced image distortion

  • US 7,025,469 B1
  • Filed: 03/23/2000
  • Issued: 04/11/2006
  • Est. Priority Date: 03/25/1999
  • Status: Expired due to Fees
First Claim
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1. A rear-view mirror with a wide viewing angle and reduced single-image distortion installed on a vehicle, the mirror comprising a monolithic plastic body which is made of transparent plastic material and has a surface that faces objects to be detected which is flat and an opposite reflecting surface which has an aspheric configuration generated by rotation, about an axis which is parallel to a centerline axis of the vehicle on which the mirror is installed, of a curve whose design equation is:


  • M=1/[1+(2E/R)]wherein M is the angular magnification of a reflected image of the mirror, E is the distance of the eye of a driver from the surface of the mirror that faces objects to be detected, and R is the radius of curvature of the reflecting surface which has a point by point variation over said reflecting surface given by the equation;


    Z=C(X2+Y2)/1+[1

    SC
    2(X2+Y2)]1/2+A(X2+Y2)wherein X, Y and Z are coordinates of the reflecting surface and C, S and A are parameters representing, respectively, a curvature factor, a shape factor and a correction factor which depend on the distance E and angular magnification M, said distance E and angular magnification M having values set in relation with the characteristics of the vehicle.

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