Optical: systems and elements – Lens – Multiple component lenses
Reexamination Certificate
2007-12-07
2009-08-18
Martinez, Joseph (Department: 2873)
Optical: systems and elements
Lens
Multiple component lenses
C359S687000, C359S758000
Reexamination Certificate
active
07576927
ABSTRACT:
The invention relates to a less costly zoom lens that can offer a sensible tradeoff between size reductions and high zoom ratios with a well-kept image quality, and that lends itself to an electronic imaging device such as a CCD or CMOS. The zoom lens comprises a positive first lens group G1, a negative second lens group G2, a positive third lens group G3and a positive fourth lens group G4, wherein zooming is implemented by changing the space between adjacent lens groups. The first lens group G1comprises one positive lens, the second lens group G2comprises two lenses, and the fourth lens group G4comprises one positive lens. The zoom lens satisfies condition (1) needed for making sure an ideal situation for the zoom ratio and low costs and condition (2) needed for the first lens group to comprise a minimum one lens and to hold back chromatic aberration of magnification as much as possible.
REFERENCES:
patent: 7190529 (2007-03-01), Miyajima et al.
patent: 2002-31756 (2002-01-01), None
patent: 2003-98433 (2003-04-01), None
patent: 2004-199000 (2004-07-01), None
Kanetaka Fumikazu
Satori Tomoyuki
Takahashi Toshio
Kenyon & Kenyon LLP
Martinez Joseph
Olympus Imaging Corp.
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