Retro-telecentric lens

Details Retro-telecentric lens Retro-telecentric lens

1974-03-11

1976-03-30

Corbin, John K.

350175TS, G02B 964, G02B 1322

Patent

active

039470946

ABSTRACT:
A retro-telecentric lens having a divergent lens group at an object side and a convergent lens group at an image plane side, wherein the back focus of the entire lens is longer than the focal distance and the diaphragm coincides with the position of the focal point at an object side, and an optical member being composed of two lenses, which satisfy a predetermined relationship between dispersion and power and the cemented surface of said two lenses faces the object side, is positioned between the above mentioned divergent lens group and the convergent lens group, thereby inward and outward coma aberration is satisfactorily corrected.

REFERENCES:
patent: 2651970 (1953-09-01), Tiller
patent: 2830495 (1958-04-01), Koch et al.

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