Flat field lenses

Details Flat field lenses Flat field lenses

1981-05-29

1985-10-08

Corbin, John K.

350573, G02B 2300

Patent

active

045456526

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

Affiliated with

Also associated with

Rating

Flat field lenses does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Flat field lenses, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Flat field lenses will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2216627