Retrofocus type wide angle objective lens

Details Retrofocus type wide angle objective lens Retrofocus type wide angle objective lens

1976-08-18

1978-09-05

Clark, Conrad J.

350214, G02B 1304, G02B 1134

Patent

active

041115589

ABSTRACT:
A retrofocus type wide angle objective lens comprising from front to rear a diverging first lens component having a non-spherical surface formed therein, a converging second lens component, a diaphragm, and a converging third lens component, whereby the second component includes a positive front lens followed by a negative lens, said positive and said negative lenses defining therebetween a first air lens of which the focal length is negative in sign, and the third component includes a negative front lens followed by a positive lens, said negative and said positive lenses defining therebetween a second air lens of which the focal length is also negative. The provision of these first and second air lenses facilitates achievement of good correction of aberrations particularly astigmatism which would be otherwise under-corrected by the introduction of the non-spherical surface into the first component.

REFERENCES:
patent: RE27799 (1973-10-01), Shimizu
patent: 3958864 (1976-05-01), Glatzel
patent: 3999840 (1976-12-01), Momiyama

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