Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2007-02-22
2008-10-28
Lester, Evelyn A. (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S683000, C359S684000, C359S685000, C359S686000, C359S715000, C359S781000, C359S726000
Reexamination Certificate
active
07443599
ABSTRACT:
A magnification varying optical system that directs light from an object to an image sensor includes in order from the object side: a first lens unit having negative optical power and including an optical axis changing element that changes the optical axis; a second lens unit having positive optical power and including three lens elements; a third lens unit having negative optical power; and a fourth lens unit having positive optical power. In this magnification varying optical system, in magnification varying from the wide-angle end to the telephoto end, the first lens unit is stationary, the distance from the first lens unit to the second lens unit decreases, and the distance from the third lens unit to the fourth lens unit increases. The magnification varying optical system satisfies the specified conditions.
REFERENCES:
patent: 7079328 (2006-07-01), Kuba
patent: 7227706 (2007-06-01), Yagyu et al.
patent: 2004-246043 (2004-09-01), None
patent: 2005-156828 (2005-06-01), None
Kohno Tetsuo
Souma Yoshihito
Terada Mamoru
Konica Minolta Opto Inc.
Lester Evelyn A.
Sidley Austin LLP
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