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Optical unit for detecting object and coordinate input apparatus using same

  • US 6,362,468 B1
  • Filed: 05/11/2000
  • Issued: 03/26/2002
  • Est. Priority Date: 06/10/1999
  • Status: Expired due to Term
First Claim
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1. An object detecting optical unit for detecting a direction or a position of an object, which is placed on a detecting plane surface and irradiated by light, by detecting the existence or non-existence of a retroreflective light reflected by a retroreflective member, said optical unit comprising:

  • a light projection means having a plurality of light sources and a plurality of lenses which correspond to said light sources, wherein said plurality of light sources and said plurality of lenses are arranged in such a manner as to form a fan shaped projection pattern which is substantially parallel to said detecting plane surface, said projection pattern being as if projected from a virtual one point light source; and

    a light receiving means having a slit, or a lens and a linear photoreceptive group, wherein said slit or lens and said linear photoreceptive group are arranged in such a manner as to form a light receiving pattern with a view field corresponding to said fan shaped projection pattern formed by said light projection means.

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