Optical: systems and elements – Lens – Telecentric system
Patent
1997-11-18
1999-06-22
Dang, Hung Xuan
Optical: systems and elements
Lens
Telecentric system
359745, 359749, G02B 1322
Patent
active
059148187
ABSTRACT:
An offset reverse telephoto projection lens that is telecentric in modulator space and has an air equivalent back focal distance of at least 3.3 inches and preferably at least 4.0 inches. The lens comprising, from the image side, a first objective lens group 408 having a negative power and a second telecentric lens group having a positive power. The second telecentric lens group 410 is telecentric in object space such that the image of the aperture is focused at infinity and light converges on the object plane perpendicular to the axis of the lens. Embodiments of the lens have a back focal distance to effective focal length ratio of at least 0.86:1, preferably at least 1.2:1, more preferably at least 1.3:1, still more preferably at least 4.08:1, and most preferably 5.0:1. The embodiments described have a field of view between 14 degrees and 73 degrees, have throw ratios of 1.2:1 to 7:1, and an overall length ranging from less than 5 inches to 12.5 inches.
Anderson Douglas W.
Tejada John A.
Trotta Patrick A.
Brill Charles A.
Dang Hung Xuan
Donaldson Richard L.
Telecky Jr. Frederick J.
Texas Instruments Incorporated
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