Wide angle objective having a non-spherical surface

Details Wide angle objective having a non-spherical surface Wide angle objective having a non-spherical surface

1974-07-15

1976-12-28

Corbin, John K.

350189, G02B 964, G02B 1304, G02B 1318

Patent

active

039998401

ABSTRACT:
A retrofocus wide angle objective with the backfocal length being at least two times the overall focal length, comprising in optical alignment, a plurality of negative meniscus lenses of forward convexities, a positive lens, a negative meniscus lens of forward convexity, a bi-convex lens, a negative lens, a positive doublet lens and a positive lens, and the first surface counting from the front being configured in a non-spherical form such that the curvature increases with distance from the optical axis. This non-spherical surface compensates for barrel distortion and negative coma which are introduced by the object-side negative meniscus lenses into the lens system.

REFERENCES:
patent: 3472577 (1969-10-01), Rosin et al.
patent: 3748021 (1973-07-01), Tajima et al.
patent: 3762801 (1973-10-01), Baker
patent: 3832035 (1974-08-01), Takahashi

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