Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2006-10-31
2006-10-31
Lester, Evelyn A. (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S651000, C359S726000, C359S733000, C359S785000
Reexamination Certificate
active
07130131
ABSTRACT:
A zoom optical system includes followings: a plurality of lens units for magnification, the plurality of lens unit for zooming including in order from a reduction conjugate side to a magnification conjugate side, a first lens unit having a positive optical power, a second lens unit having a negative optical power and a third lens unit having a positive optical power, wherein during zooming, respective intervals between the above described first, second and third lens unit vary, and across the entire zooming range, a magnification-side conjugate position with respect to a reduction-side conjugate position and a position of a pupil of the above described zoom optical system with respect to a reduction-side conjugate position are substantially immobile respectively.
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Hakko Manabu
Hatakeyama Koshi
Canon Kabushiki Kaisha
Lester Evelyn A.
Morgan & Finnegan L.L.P.
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