Optical: systems and elements – Lens – With variable magnification
Patent
1990-12-05
1993-08-31
Arnold, Bruce Y.
Optical: systems and elements
Lens
With variable magnification
359676, 359684, 359695, G02B 1514
Patent
active
052414205
ABSTRACT:
A zoom lens system comprising, in the order from the object side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, a fourth lens unit having a positive refractive power and a fifth lens unit having a negative refractive power, adapted so as to vary the focal length by moving said first through fourth lens units independently while keeping said fifth lens unit fixed, and adapted so as to perform focusing by moving at least one of said second through fifth lens units. This zoom lens system has a high vari-focal ratio, a wide field angle, a compact size, and optical performance stabilized regardless of zooming and focusing.
REFERENCES:
patent: 4094586 (1978-06-01), Sato et al.
patent: 4380377 (1983-04-01), Sato et al.
patent: 4456341 (1984-06-01), Kato
patent: 4636040 (1987-01-01), Tokumaru
patent: 4749265 (1988-06-01), Hattori et al.
patent: 4789229 (1988-12-01), Yamanashi
patent: 4830477 (1989-05-01), Takahashi et al.
patent: 4840468 (1989-06-01), Tanaka
patent: 4844600 (1989-07-01), Tokumaru
patent: 4854685 (1989-08-01), Corbasson
patent: 5061051 (1991-10-01), Miyamae
Arnold Bruce Y.
Dang Hung Xuan
Olympus Optical Co,. Ltd.
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