Optical: systems and elements – Lens – With variable magnification
Patent
1995-01-18
1997-02-11
Sugarman, Scott J.
Optical: systems and elements
Lens
With variable magnification
359691, G02B 1514
Patent
active
056026803
ABSTRACT:
A finite conjugate distance zoom lens system includes sequentially from the enlarging side a first lens group having a negative refracting power and a second lens group having a positive refracting power. The second lens group consists of sequentially from the enlarging side two or three positive lens elements, first and second cemented lenses, a negative lens element, and a positive lens element. Both of the first and second lenses consist of cemented biconvex lens element and negative lens element. During a zooming operation from the maximum focal length edge to the minimum focal length edge, the first lens group shifts from the enlarging side to the reducing side on the maximum focal length side and shifts from the reducing side to the enlarging side on the minimum focal length side. On the other hand, the second lens group monotonously shifts from the enlarging side to the reducing side during the zooming operation.
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patent: 5105311 (1992-04-01), Tokumaru et al.
patent: 5144489 (1992-09-01), Shibayama
patent: 5218476 (1993-06-01), Ito
patent: 5270864 (1993-12-01), Watanabe
patent: 5345338 (1994-09-01), Ueda et al.
Minolta Co. , Ltd.
Schwartz Jordan M.
Sugarman Scott J.
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