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...

2011-03-01

2011-03-01

Schwartz, Jordan M. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S680000, C359S754000

Reexamination Certificate

active

07898743

ABSTRACT:
An image forming optical system according to the present invention is characterized in that, in an image forming optical system having a positive lens group, a negative lens group, and an aperture stop, the positive lens group is disposed at an object side of the aperture stop,the positive lens group has a cemented lens which is formed by cementing a plurality of lenses,in a rectangular coordinate system in which a horizontal axis is let to be Nd and a vertical axis is let to be νd, 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 is included in both of areas namely, an area which is determined by a line when a lower limit value is in a range of a following conditional expression (1a), and a line when an upper limit value is in a range of the following conditional expression (1a), and of an area determined by following conditional expressions (2a) and (3a).in-line-formulae description="In-line Formulae" end="lead"?1.45<β<2.15  (1a)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?1.30<Nd<2.20  (2a)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?3<νd<12  (3a)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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Malacara, Daniel et al.: “Handbook of Lens Design,” Appendices, pp. 632-635.

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