Image forming optical system and electronic image pickup...

Details Image forming optical system and electronic image pickup... Image forming optical system and electronic image pickup...

2006-09-11

2010-12-07

Choi, William C (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S793000

Reexamination Certificate

active

07848030

ABSTRACT:
In an image forming optical system having a positive lens group, a negative lens group, and an aperture stop, the positive lens group being disposed at an image-plane side of the aperture stop and having a cemented lens, and when a straight line indicated by Nd=α×νd+β (where, α=−0.017) is set, Nd and νd of at least one lens forming the cemented lens are included in both an area which is determined by a line when a lower limit value is in a range of a following conditional expression (1), and a line when an upper limit value is in a range of the following conditional expression (1), and in an area determined by following conditional expressions (2) and (3)in-line-formulae description="In-line Formulae" end="lead"?1.45<β<2.15  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?1.30<Nd<2.20  (2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?3<νd<25  (3)in-line-formulae description="In-line Formulae" end="tail"?Here, Nd denotes a refractive index, and νd denotes an Abbe's number.

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International Preliminary Report on Patentability and Written Opinion, International Application No. PCT/JP2006/318446, filed Sep. 11, 2006.

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