Optical: systems and elements – Lens – With variable magnification
Patent
1992-09-02
1994-03-22
Arnold, Bruce Y.
Optical: systems and elements
Lens
With variable magnification
359684, 359715, G02B 1514, G02B 1318, G02B 302
Patent
active
052969690
ABSTRACT:
The present invention provides a zoom lens system which comprises nine or less constituent lenses in all, has a short total length and a small front lens, is reduced in terms of size, weight and cost, has a high zoom ratio and a large aperture ratio, and is best suited for use with handy camcorders, and which comprises a first lens unit G1 having a positive refracting power, a second lens unit G2 having a negative refracting power and movable horizontally along the optical axis during zooming, a third lens unit G3 constantly remaining fixed and consisting of a positive lens in which the object-side surface has a stronger curvature and at least the object-side surface takes an aspherical configuration and a negative meniscus lens in which the image-side surface has a stronger curvature, two lenses in all, said third lens unit G3 having a positive refracting power as a whole, and a fourth lens unit G4 movable horizontally along the optical axis for focus regulation during zooming and moving the object point and consisting solely of a positive single lens in which the object-side surface assumes an aspherical configuration.
REFERENCES:
patent: 4416518 (1983-11-01), Hugues et al.
patent: 4859042 (1989-08-01), Tanaka
patent: 4995707 (1991-02-01), Hashimoto
patent: 5138492 (1992-08-01), Hamano et al.
patent: 5155630 (1992-10-01), Hata
patent: 5189558 (1993-02-01), Ishii et al.
Arnold Bruce Y.
Olympus Optical Co,. Ltd.
Parsons David R.
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