Flat field lenses

Details Flat field lenses Flat field lenses

1983-12-16

1986-03-11

Corbin, John K.

350447, 350474, 350480, 350573, G02B 906, G02B 912, G02B 1318

Patent

active

045751951

ABSTRACT:
A flat field lens system wherein the Petzval sum is corrected without requiring many spaced high powered elements or sharply bent elements. This is achieved by having the Petzval sum correction dominated by the index difference. In an embodiment suitable for use in endoscope transfer optics where medium or high aperture is required, the spherical aberration is best corrected by use of an aspheric surface on the low index material. Where high aperture is not required, as for example in a photographic wide angle objective, spherical aberration is kept low by using a relatively small aperture.

REFERENCES:
patent: 2346062 (1944-04-01), Altman
patent: 2519760 (1950-08-01), Hett
patent: 2571308 (1951-10-01), Taylor
patent: 2899862 (1959-08-01), Baker
patent: 4025155 (1977-05-01), Imai
patent: 4168882 (1979-09-01), Hopkins
patent: 4354730 (1982-10-01), Bel
patent: 4385810 (1983-05-01), Hamou
"Systematics of Photographic Lens Design Conference", Jan Hoogland, (Society of Photo-Optical Instrumentation Engineers-1980).

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