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FREE-FORM SURFACE LENS, METHOD OF DESIGNING FREE-FORM SURFACE LENS, FREE-FORM SURFACE MIRROR, METHOD OF DESIGNING FREE-FORM SURFACE MIRROR, AND PROJECTION TYPE VIDEO DISPLAY APPARATUS

  • US 20170199308A1
  • Filed: 05/29/2014
  • Published: 07/13/2017
  • Est. Priority Date: 05/29/2014
  • Status: Active Grant
First Claim
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1. A free-form surface lens made of a transparent resin forming an oblique projection optical system including a reflecting mirror with a convex surface with respect to a video projection surface in a projection type video display apparatus, comprising:

  • a lens effective region having a surface on which a predetermined free-form surface is formed; and

    an edge surface formed to surround the lens effective region,wherein the lens effective region and the edge surface in a part of a circumference surrounding the lens effective region where the edge surface is not formed are joined to each other by at least either one of a curved surface and a flat surface set so as not to change a direction of a tilt of the lens effective region in vicinity of the lens effective region, and an end surface including at least either one of the curved surface and the flat surface is set as a tapered surface.

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