Condensers for illumination systems

Details Condensers for illumination systems Condensers for illumination systems

1994-02-17

1996-05-07

Dowling, William C.

Optics: image projectors

Particular condenser

362335, G03B 2114

Patent

active

055151230

ABSTRACT:
A condenser lens for a projection system optimizes the amount of overall brightness directed toward an aperture and the uniformity of illumination at the aperture. The lens, when placed in the projection system, has a marginal ray which starts at the center of the light source, passes through the edge of the condenser lens, and intersects the region to be illuminated at or near its edge. The lens further has a relative zonal ray height which is selected based on the distance from the light source to the aperture. The condensing lens system is particularly useful in the construction of overhead projectors.

REFERENCES:
patent: 934579 (1909-09-01), Straubel et al.
patent: 1507212 (1924-09-01), Silberstein et al.
patent: 1615674 (1927-01-01), Beechlyn
patent: 1946088 (1934-02-01), Maurer, Jr.
patent: 2587956 (1952-03-01), Bastien
patent: 4327972 (1982-05-01), Brunsting
patent: 4609978 (1986-09-01), Hsieh et al.
patent: 4741613 (1988-05-01), Vanderwerf
patent: 5317349 (1994-05-01), Vanderwerf
patent: 5400094 (1995-03-01), Eckhardt

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