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Head-up display device with curved optical surface having total reflection

  • US 7,262,919 B1
  • Filed: 10/24/1997
  • Issued: 08/28/2007
  • Est. Priority Date: 06/13/1994
  • Status: Expired due to Fees
First Claim
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1. An optical apparatus comprising:

  • a device for displaying an image; and

    an ocular optical system for projecting an image formed by said device for displaying an image and for leading the image to an observer'"'"'s eyeball;

    said ocular optical system comprising first, second and third surfaces, in which a space defined by said first, second and third surfaces is filled with a medium having a refractive index larger than 1;

    said first, second and third surfaces including, in order from an observer'"'"'s eyeball side toward said device for displaying an image, a first surface serving as both a refracting surface and an internally reflecting surface, a second surface serving as a reflecting surface of positive power which faces said first surface and is decentered or tilted with respect to an observer'"'"'s visual axis, and a third surface serving as a refracting surface closest to said device for displaying an image, at least two of said at least three surfaces having a finite curvature radius;

    wherein any one of said first, second and third surfaces is a decentered aspherical surface;

    wherein any one of said first, second and third surfaces is an anamorphic surface;

    wherein said optical apparatus satisfies the following condition in a case where a vertical plane containing said observer'"'"'s visual axis is defined as a YZ-plane, and a horizontal plane perpendicular to the YZ-plane is defined as an XZ-plane;


    1<

    |Ry2/Rx2|≦

    1.921where Ry2 is a curvature radius of said second surface in the YZ-plane, and Rx2 is a curvature radius of said second surface in the XZ-plane.

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