1985-06-06
1988-08-30
Corbin, John K.
350465, G02B 1318, G02B 934
Patent
active
047672013
ABSTRACT:
For small type wide angle lenses for use with a compact camera, so-called inverted retrofocus lenses are often used. In this type of lens, the lens can be formed into more compact by increasing a refracting power of a rear unit of a negative meniscus with a convex surface thereof greatly curved toward an image and a front unit on the side of an object. However, this arrangement gives rise to an aberration. This aberration can be compensated by introducing at least one aspherical surface into the front unit and rear unit. In addition, this aspherical lens can be easily produced if it is formed of plastics.
REFERENCES:
patent: 4394073 (1983-07-01), Wakamiya
patent: 4456345 (1984-06-01), Fujibayashi
patent: 4606607 (1986-08-01), Kurihara
Fujita Hisao
Wakabayashi Tomoko
Yamazaki Hiroyuki
Bierman Jordan B.
Corbin John K.
Gass Rebecca D.
Konishiroku Photo Industry Co,., Ltd.
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