Projection objective assembly

Details Projection objective assembly Projection objective assembly

1985-03-04

1987-09-22

Corbin, John K.

350422, G02B 934, G02B 1508

Patent

active

046951369

ABSTRACT:
In order to reduce the cost of a projecting lens system while providing excellent optical parameters for projection lenses of a series having different focal lengths but essentially the same high relative opening, all the lenses of the series utilize a common first component consisting of a positive lens, a positive meniscus and a negative lens. Only the second component is replaceable and comprises one lens or two closely spaced lenses. The second component for the longest focal length is preferably composed of low refractivity flint glass while the second component at the lowest end of the focal length range is composed of high refractivity crown glass.

REFERENCES:
patent: 3649104 (1972-03-01), Edwards et al.

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