Stepless micrographic zoom lens having large magnification ratio

Details Stepless micrographic zoom lens having large magnification ratio Stepless micrographic zoom lens having large magnification ratio

1993-11-30

1996-01-02

Sugarman, Scott J..

Optical: systems and elements

Lens

With variable magnification

359679, 359690, G02B 1514

Patent

active

054814057

ABSTRACT:
A stepless zoom lens useful in micrographic applications providing stepless magnfications from 6.8x to 32x, a zoom ratio exceeding 4.7 to 1. Fourteen elements are arranged in three groups. An object to image distance of 1,750 millimeters is maintained. The first group consists of a cemented doublet air spaced from a single meniscus element, for a total of three elements in the group. The second group consists of a meniscus element air spaced from a cemented doublet, which is in turn air spaced from a second meniscus element, a total of four elements in the group. The third group consists of a biconvex element air spaced from a cemented doublet, followed in order by an air space, a meniscus, an air space and a final doublet, for a total of seven elements in the group.

REFERENCES:
patent: 4733951 (1988-03-01), Pareigat
patent: 4743102 (1988-05-01), Pareigat
patent: 4746204 (1988-05-01), Pareigat
patent: 4750820 (1988-06-01), Pareigat
patent: 5087987 (1992-02-01), Simbal

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