Optical: systems and elements – Lens – With variable magnification
Patent
1993-01-28
1995-02-07
Kwon, John T.
Optical: systems and elements
Lens
With variable magnification
359684, G02B 1514
Patent
active
053880048
ABSTRACT:
A compact, wide angle, high magnification zoom lens in which the following lens groups are successively disposed in order from the object side: a first lens group with positive refractive power in a fixed position, a second lens group with negative refractive power; a third lens group with positive refractive power; a fourth lens group with negative refractive power; and a fifth lens group that is moved along the optical axis in order to compensate for a discrepancy of the image focal point caused by a change of magnification, wherein the second through fifth lens groups are movable along the optical axis of the zoom lens during a change in magnification.
REFERENCES:
patent: 4269484 (1981-05-01), Laurent
patent: 4749266 (1988-06-01), Takahashi et al.
patent: 4830477 (1989-05-01), Takahashi et al.
patent: 4854685 (1989-08-01), Corbasson
patent: 5202992 (1993-04-01), Banno et al.
English-language Abstract, Japanese Patent Application Open to Public Inspection No. 3-158813 (Jul. 8, 1991).
English-language Abstract, Japanese Patent Application Open to Public Inspectin No. 57-2014 (Jan. 7, 1982).
English-language Abstract, Japanese Patent Application Open to Public Inspection No. 60-39613 (Mar. 1, 1985).
Konica Corporation
Kwon John T.
Verdier Christopher
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