Telecentric image-forming optical system for large image size

Details Telecentric image-forming optical system for large image size Telecentric image-forming optical system for large image size

1988-07-14

1990-05-29

Sugarman, Scott J.

350463, G02B 1322, G02B 964

Patent

active

049290665

ABSTRACT:
A telecentric image-forming optical system comprising a first lens group including a double-convex lens, a meniscus lens whose convex side faces an object or a plano-convex lens, and a double-concave lens arranged in this order; and a second lens group including a double-convex lens, a meniscus lens whose convex side faces an image or a plano-convex lens, and a double-concave lens arranged in this order, wherein the secondary focal point of the first lens group and the principal focal point of the second lens group substantially coincide with each other in the vicinity of a double-convex lens. The telecentric image-forming optical system is compact and forms an image which is large sized in relation to the compact length of the system.

REFERENCES:
patent: 4300817 (1981-11-01), Betensky
patent: 4588265 (1986-05-01), Takahashi

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