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Projection type image display apparatus

  • US 7,144,117 B2
  • Filed: 09/20/2004
  • Issued: 12/05/2006
  • Est. Priority Date: 07/09/2003
  • Status: Expired due to Fees
First Claim
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1. A projection type image display apparatus comprising:

  • projection means for projecting an image on an image-displaying screen by scanning with a laser beam, anddetection means for detecting with a detection beam the presence or absence of an intruding object between said projection means and said screen, wherein detection by the detection means is conducted relative to a position preceding said laser beam in the scan direction of said laser beam,wherein in said projection means, said scanning with said laser beam is conducted by a mirror surface turned around an axis, and said detection beam is radiated onto said mirror surface at an angle different from the incidence angle of said laser beam onto said mirror surface.

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