Optical: systems and elements – Lens – Multiple component lenses
Patent
1997-08-22
1999-08-31
Ben, Loha
Optical: systems and elements
Lens
Multiple component lenses
359779, 359763, 359784, 359813, G02B 912
Patent
active
059461454
ABSTRACT:
A compact variable focal length optical system is suitable for high zoom ratio. At least a first lens group having a positive refractive power, a second lens group, and a third lens group having a negative refractive power are provided. At least the first lens group is moved toward an object side of the system to satisfy a particular conditional equation so that a distance between the first and second lens groups is increased and a distance between the second and third lens groups is changed. In certain constructions, a first lens group having a positive refractive power, a second lens group having a negative refractive power positioned adjacent to and on an object side of the first lens group, and a third lens group positioned adjacent to and on an image side of the first lens group are provided. The first lens group includes at least two sub-lens groups. One of the sub-lens groups is moved in a direction almost orthogonal to the optical axis so as to shift an image in a direction almost orthogonal to the optical axis.
REFERENCES:
patent: 5069536 (1991-12-01), Ogata
patent: 5144488 (1992-09-01), Endo et al.
patent: 5247393 (1993-09-01), Sugawara
patent: 5272566 (1993-12-01), Aoki
patent: 5402268 (1995-03-01), Tatsuno
patent: 5801886 (1998-09-01), Lee
Ben Loha
Nikon Corporation
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