Small refractive zoom lens optical system

Details Small refractive zoom lens optical system Small refractive zoom lens optical system

2008-02-14

2010-11-09

Martinez, Joseph (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

Reexamination Certificate

active

07830621

ABSTRACT:
A zoom lens optical system includes: a first lens group that is provided close to an object, has a negative refractive power in total, and includes an optical part having a surface that reflects light; a second lens group that has a negative refractive power in total; an iris; a third lens group that has a positive refractive power in total; and a fourth lens group that has a positive refractive power in total.

REFERENCES:
patent: 7085070 (2006-08-01), Mihara
patent: 2001/0038496 (2001-11-01), Yamamoto et al.
patent: 2004-334070 (2004-11-01), None
JP 2004-334070 (Reference AG) is also discussed on p. 1 of the current application.

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