Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2007-08-07
2007-08-07
Spector, David N. (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S676000, C359S683000
Reexamination Certificate
active
11313758
ABSTRACT:
A zoom lens including a first lens unit exhibiting a positive refractive power and always being statically positioned along an optical axis when a power of the zoom lens is varied or the focusing is conducted and including a reflective optical element for bending an optical path, a second lens unit exhibiting a negative refractive power and including a negative lens, a negative lens and a positive lens, along the optical axis in this order from an object side, a third lens unit exhibiting a positive refractive power, a fourth lens unit exhibiting a positive refractive power, and including at least two positive lenses, and a fifth lens unit exhibiting a negative refractive power, wherein the second lens unit, the fourth lens unit and the fifth lens unit are moved for varying the power of the zoom lens.
REFERENCES:
patent: 5136430 (1992-08-01), Hamanishi
patent: 5414562 (1995-05-01), Ueda
patent: 5966245 (1999-10-01), Nagaoka
patent: 7113346 (2006-09-01), Souma et al.
patent: 2002/0060855 (2002-05-01), Ohashi
patent: 2004/0008271 (2004-01-01), Hagimori et al.
patent: 2004/0021791 (2004-02-01), Nishina
patent: 1677134 (2006-07-01), None
patent: 2000-131610 (2000-05-01), None
European Search Report prepared for EP 05 25 7844, on Mar. 21, 2006.
Konica Minolta Opto Inc.
Spector David N.
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