Optics: image projectors – Housing
Reexamination Certificate
2005-05-03
2005-05-03
Dowling, William C. (Department: 2851)
Optics: image projectors
Housing
C353S052000, C353S082000
Reexamination Certificate
active
06886947
ABSTRACT:
The present invention provides a projection type display apparatus. The projection type display apparatus for enlarging and projecting an image onto a projected plane includes a projection optical unit for projecting image light onto the projected plane, an optical device for dividing light emitted from a light source into image light that travels to the projection optical unit and unnecessary light that travels outside the projection optical unit, a holding member for holding the projection optical unit, and a light receiving member for receiving the unnecessary light, wherein the light receiving member is provided as a member independent of the holding member. Accordingly, a projection typo display apparatus can be realized that is capable of suppressing or reducing a temperature rise in the holding member caused by the incidence of unnecessary light and the deformation thereof caused by thermal expansion and that is capable of preventing a deterioration in the image quality of a displayed image.
REFERENCES:
patent: 6179424 (2001-01-01), Sawamura
patent: 6250763 (2001-06-01), Fielding et al.
patent: 6357878 (2002-03-01), Sawamura
patent: 6419365 (2002-07-01), Potekev et al.
Canon Kabushiki Kaisha
Dowling William C.
Morgan & Finnegan , LLP
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