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US 4,289,377 AGranted
Projecting apparatus
AssigneeCanon Kabushiki Kaisha
InventorsYoshiya Matsui, Setsuo Minami, Noritaka Mochizuki
Life of this patent
Estimating the term…
Abstract
In a projecting apparatus which focuses the image of an object on an intermediate mirror through a lens array and finally projects the reflected image onto a projection plane again through said lens array, a polarizing beam splitter is provided between the object plane and the lens array to reduce the light loss and to compactize the apparatus.
Claims4
A projecting apparatus comprising:
- an array of rod-shaped lenses for forming the image of an object, each of said lenses having only two lens surfaces and an axial length larger than the effective diameter thereof:
- a plane mirror positioned in the vicinity of the intermediate image plane of said array of rod-shaped lenses, wherein the principal ray of light rays incident on said mirror is traced by the principal ray of light rays reflected by said plane mirror;
- a polarizing beam splitter positioned obliquely to the optical axis of said lens array and being disposed between the object and the lens array;
- and
- optical means for changing the polarizing direction of the light to a direction perpendicular thereto.
2 more elements
Dependencies are inferred from the claim text.