Temperature compensating lens system for projection television

Details Temperature compensating lens system for projection television Temperature compensating lens system for projection television

1991-09-13

1993-12-21

Powell, Mark R.

Facsimile and static presentation processing

Facsimile

Recording apparatus

359764, 359714, H04N 574

Patent

active

052725405

ABSTRACT:
In a projection lens device having at least two plastic lenses for magnification-projecting an original image displayed on a display screen onto a screen, one of the two plastic lens is convex at a center thereof toward the screen and concave at a periphery thereof, and the other lens has a weak positive refractive power toward the screen at a center thereof and a stronger positive refractive power at a periphery thereof. A variation of a lens power due to a change of a surrounding environment is cancelled out by the concave shape at the periphery of the one lens and the positive refractive power at the periphery of the other lens.

REFERENCES:
patent: 4776681 (1988-10-01), Moskovich
patent: 4838670 (1989-06-01), Ueda
patent: 4963007 (1990-10-01), Moskovich
patent: 4976525 (1990-12-01), Matsumura et al.
patent: 5055922 (1991-10-01), Wessling

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