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Optical system and optical apparatus

  • US RE37,292 E1
  • Filed: 05/21/1999
  • Issued: 07/24/2001
  • Est. Priority Date: 07/14/1995
  • Status: Expired due to Fees
First Claim
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1. An image display apparatus comprising an image display device for displaying an image, and an ocular optical system for projecting the image displayed by said image display device and for leading the projected, image to an observer'"'"'s eyeball,said ocular optical system having at least three optical surfaces, wherein a space formed by said at least three optical surfaces is filled with a medium having a refractive index larger than 1, said at least three optical surfaces being defined as a first surface, a second surface, and a third surface, respectively, in order in which light rays pass in backward ray tracing from said observer'"'"'s eyeball to said image display device, and said at least three optical surfaces being disposed such that light rays pass in said backward ray tracing from said observer'"'"'s eyeball pass through the first surface and are reflected by the second surface and further reflected by the third surface, which is a reflecting surface having positive power, and the light rays reflected by said third surface are reflected by said first surface and pass through said second surface to reach said image display device.

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