Patent
1978-07-28
1980-12-23
Clark, Conrad J.
G02B 1516
Patent
active
042407001
ABSTRACT:
The present invention relates to a wide angle zoom lens system having a high variation ratio and a zooming range between a wide angle and a semi-telescopic angle, with the zoom ratio being approximately 2.3 to 3.0 times. The present invention provides the wide variation especially at the wide angle portion of the zoom. The present invention comprises, in order from the object side, a first lens group I having a positive focal length f.sub.I, a second lens group II (also referred to as a first variator lens group) having a negative focal length f.sub.II, and a third lens group III (also referred to as a second variator lens group) having a positive focal length f.sub.III. The present invention may include a lens group III' having a positive focal length f.sub.III'. The lens group III' may be disposed along the optical axis either at the image side or at the object side of the third lens group III. The lens group III' is unmovable during zooming. Both the first and second variator lens groups II, III provide a variation effect so as to produce simultaneously a component of the total variator effect.
REFERENCES:
patent: 3549242 (1970-12-01), Higuchi et al.
patent: 3771853 (1973-11-01), Nakamura
patent: 3840290 (1974-10-01), Betensky
patent: 3920315 (1975-11-01), Linke
patent: 3975089 (1976-08-01), Betensky
Ogawa Ryota
Okudaira Sadao
Tachihara Satoru
Asahi Kogaku Kabushiki Kaisha
Clark Conrad J.
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