Lens system for projection television
First Claim
1. In a projection television receiver including a cabinet, a projecting cathode-ray tube, a display screen and a projecting lens system for projecting an image formed on a face of said cathode-ray tube onto said screen, the improvement wherein said lens system comprises a plano-convex lens and a plano-concave lens having optical axes forming an angle within a range of 170°
- to 180°
, first and second mirrors for reflecting light rays passing through said plano-concave lens along a path parallel to said optical axis of said plano-convex lens, and a convex lens disposed in an optical path between said plano-concave lens and said plano-convex lens.
1 Assignment
0 Petitions
Accused Products
Abstract
A projection television receiver having a more compact cabinet size due to an improved projection lens system. The projection lens system includes a plano-concave lens and a plano-convex lens having optical axes forming an angle in a range of 170° to 190°. First and second mirrors are positioned rearwardly of the plano-concave mirror and the plano-convex mirror to reflect light rays from the plano-concave mirror parallel to the optical axis of the plano-convex mirror. A convex lens is positioned between the two mirrors and the optical path between the plano-concave mirror and the plano-convex mirror.
35 Citations
6 Claims
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1. In a projection television receiver including a cabinet, a projecting cathode-ray tube, a display screen and a projecting lens system for projecting an image formed on a face of said cathode-ray tube onto said screen, the improvement wherein said lens system comprises a plano-convex lens and a plano-concave lens having optical axes forming an angle within a range of 170°
- to 180°
, first and second mirrors for reflecting light rays passing through said plano-concave lens along a path parallel to said optical axis of said plano-convex lens, and a convex lens disposed in an optical path between said plano-concave lens and said plano-convex lens. - View Dependent Claims (2, 3, 4, 5, 6)
- to 180°
Specification