Projection type image display apparatus
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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Abstract
A projection type image display apparatus including a scanning mirror and a projection lens adapted to project an image on an image-displaying screen by scanning with a laser beam, and a detector adapted to detect the presence or absence of an intruding object between the projection means and the screen, wherein detection by the detector is conducted relative to a position preceding the laser beam in the scan direction of the laser beam.
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Citations
17 Claims
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1. A projection type image display apparatus comprising:
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projection means for projecting an image on an image-displaying screen by scanning with a laser beam, and detection 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A projection type image display apparatus comprising:
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projection means for projecting an image on an image-displaying screen by scanning with a laser beam, and detection means for detecting with a detection beam while scanning with said laser 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, and wherein said laser beam is projected from said projection means onto said screen in the state of a laser beam modulated in one-dimensional direction, and said scanning is conducted in a direction substantially orthogonal to the longitudinal direction of said laser beam. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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Specification