Optical: systems and elements – Lens – With variable magnification
Patent
1993-02-12
1994-05-17
Look, Edward K.
Optical: systems and elements
Lens
With variable magnification
359885, 359708, G02B 1514, G02B 1318
Patent
active
053133315
ABSTRACT:
The present invention relates to a zoom lens system which comprises ten or less lenses, has a very short total length and a small front lens diameter, is reduced in size, weight and cost and has a large aperture ratio and a high zoom ratio. This zoom lens system comprises a zoom subsystem consisting of a first lens unit having a positive refracting power and a second lens unit having a negative refracting power and an image formation subsystem consisting of a third lens unit having a positive refracting power and remaining constantly fixed and a fourth lens unit having a positive refracting power and movable for zooming and focal position regulation and which has a zoom ratio of 8, a field angle of 1.4 and a very short total length including filters, as expressed by 9.7 f.sub.W at 54.degree., is reasonably and well balanced for various aberrations inclusive of spherical aberration, and has a very excellent capability of forming images by adopting some suitable means for the paraxial arrangement, actual lens configuration and arrangement of the image formation subsystem, applying aspherical configuration to a part thereof and taking some pertinent means for the positions of various optical filters.
REFERENCES:
patent: 4859042 (1989-08-01), Tanaka
patent: 5000551 (1991-03-01), Shibayama
patent: 5189558 (1993-02-01), Ishii et al.
patent: 5221994 (1993-06-01), Nishio
Lee Michael S.
Look Edward K.
Olympus Optical Co,. Ltd.
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