Optical: systems and elements – Lens – Multiple component lenses
Patent
1994-02-09
1997-06-03
Sugarman, Scott J.
Optical: systems and elements
Lens
Multiple component lenses
359714, 359715, 359716, 359753, 359764, 359766, G02B 934, G02B 1318, G02B 1304, G02B 960
Patent
active
056360673
ABSTRACT:
A high-performance taking lens system suitable for a lens shutter type camera, which is capable of displaying superior optical performance as far as the edges of film image field with minimal deterioration of the performance despite a simple arrangement. The taking lens system has a front lens unit including at least one positive lens (G1) and at least one negative lens (G2) whose image-side surface has a higher curvature than that of the object-side surface thereof, and a rear lens unit disposed behind the front lens unit and including a doublet (G3) which consists of one positive lens and one negative lens and which has a positive refractive power, and a positive lens (G4). The lens surface of the doublet (G3) that is the closest to the image side is concave toward the image side. The intermediate lens surface of the doublet (G3) is convex toward the image side. The negative lens (G2) is preferably a meniscus negative lens having a concave surface directed toward the image side. Focusing from the infinite object point to a near object point is preferably effected by moving the two lens units together as one unit toward the object side while varying the air spacing therebetween.
REFERENCES:
patent: 4240705 (1980-12-01), Fujibayashi
patent: 4359270 (1982-11-01), Okudaira
Olympus Optical Co,. Ltd.
Sugarman Scott J.
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