Telecentric rear converter

Details Telecentric rear converter Telecentric rear converter

1982-12-06

1986-05-13

Corbin, John K.

350453, G02B 1322

Patent

active

045882657

ABSTRACT:
A telecentric rear converter mountable on the image side of an objective lens to enlarge the composite focal length of the rear converter and the objective lens more greatly than the focal length of the objective lens includes a first lens group of negative refractive power and a second lens group of positive refractive power disposed on the image side of the first lens group. The two lens groups are disposed so that the spacing between the principal points thereof is substantially equal to the difference between the respective absolute values of the focal lengths of the two lens groups. When the telecentric rear converter is mounted on the image side of the objective lens, the rearward focus of the first lens group is substantially coincident with the image point by the objective lens and converts the convergent light beam by the objective lens into a substantially parallel light beam, and the second lens group maintains its telecentricity while securing a predetermined back focal length.

REFERENCES:
patent: 3572886 (1971-03-01), Curtiss et al.
patent: 4154508 (1979-05-01), Nakamura
patent: 4365871 (1982-12-01), Muchel

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