Two-unit zoom lens system

Details Two-unit zoom lens system Two-unit zoom lens system

1994-03-25

1996-07-30

Nelms, David C.

Optical: systems and elements

Lens

With variable magnification

359714, G02B 1514

Patent

active

055417736

ABSTRACT:
A low-cost, high-performance two-unit zoom lens system for use with a compact camera, which has a zoom ratio of about 2 to 2.5. The zoom lens system has a 1-st lens unit (G1) of positive power, and a 2-nd lens unit (G2) of negative power. The 1-st lens unit (G1) is composed of a plastic lens (L1) of extremely small power having an aspherical surface, and a positive lens group consisting of lens elements (L2) and (L3). The 2-nd lens unit (G2) is composed of a positive lens (L4), and a negative lens (L5) having an aspherical surface.

REFERENCES:
patent: 4836660 (1989-06-01), Ito
patent: 5113287 (1992-05-01), Nakayama
patent: 5218478 (1993-06-01), Itoh
patent: 5227920 (1993-07-01), Shibayama
patent: 5309285 (1993-05-01), Ito
patent: 5315440 (1994-05-01), Betensky et al.
patent: 5327290 (1994-07-01), Fukushima

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