Optical: systems and elements – Lens – With variable magnification
Patent
1992-12-22
1995-07-18
Sugarman, Scott J.
Optical: systems and elements
Lens
With variable magnification
359685, 359708, G02B 1514, G02B 1318
Patent
active
054347106
ABSTRACT:
A zoom lens system comprising, in order from the object side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power and a third lens unit having a positive refractive power, and configured so as to vary a focal length thereof from a wide position to a tele position by moving the first lens unit non-linearly for maintaining an image surface at a constant location, and moving the second lens unit and the third lens unit from the image side toward the object side so that an airspace reserved between these two lens units is narrowed. The first lens unit consists, in order from the object side, of a negative meniscus lens element having a convex surface on the object side, a negative lens element and a positive meniscus lens element having a convex surface on the object side, the second lens unit consists, in order from the object side, of two positive lens elements and a biconcave lens element, and the third lens unit consists, in order from the object side, of a positive lens element and a negative lens element. The zoom lens system comprises a small number of lens elements including particular three lens elements which compose the first lens unit, and has a high vari-focal ratio and favorable optical performance.
REFERENCES:
patent: 4726666 (1988-02-01), Ota et al.
patent: 4730907 (1988-03-01), Kikuchi et al.
patent: 4733952 (1988-03-01), Fujioka
patent: 4735493 (1988-04-01), Tachihara
Olympus Optical Co,. Ltd.
Sugarman Scott J.
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