Three element objective lens with ellipsoidal, hyperbolic, and p

Details Three element objective lens with ellipsoidal, hyperbolic, and p Three element objective lens with ellipsoidal, hyperbolic, and p

1974-10-18

1976-03-16

Corbin, John K.

350192, 350226, B29D 1318, G02B 304, G02B 914

Patent

active

039443370

ABSTRACT:
An objective lens comprising three elements, a front positive biconvex element, a middle negative biconcave element and a rear positive biconvex element. The first two elements are made of inexpensive plastic materials. Aberration correction at a high relative aperture is improved by the use of aspheres on selected surfaces of the first and second elements.

REFERENCES:
patent: 1507212 (1924-09-01), Silberstein
patent: 2530397 (1950-11-01), Merte
patent: 3194139 (1965-07-01), Babcock
patent: 3443863 (1969-05-01), Ruben
patent: 3762801 (1973-10-01), Baker

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