G - Physics – 02 – B
Patent
G - Physics
02
B
88/105
G02B 13/00 (2006.01) G02B 13/16 (2006.01) G02B 13/18 (2006.01) G03B 21/20 (2006.01) H04N 5/74 (2006.01)
Patent
CA 1241221
ABSTRACT: A lens system is provided which is suitable for back-projecting an enlarged image of a TV cathode ray tube (CRT). To achieve a compact cabinet design 1 for such a projection television set, a short projection throw and a wider projection angle are required, together with a wide aperture (F/l) for a bright projected picture and with a definition sufficient to resolve 625 line television pictures. The lens system comprises a concave CRT face plate FP and only two lens elements L1, L2, each of positive power and each having one aspheric surface, the powers of the elements being chosen so that 0.4 K <K1 < 0.60 K and 0.75 K< K2 < 1.05 K where K1 is the power of the element remote from the object surface, K2 is the power of the element adjacent the object surface and K is the total power of the projection lens.
459296
Koninklijke Philips Electronics N.v.
Van Steinburg C.e.
LandOfFree
Projection lens system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Projection lens system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Projection lens system will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1212182