Zoom lens system and electronic image pickup apparatus using...

Details Zoom lens system and electronic image pickup apparatus using... Zoom lens system and electronic image pickup apparatus using...

2008-07-22

2008-07-22

Hasan, Mohammed (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

Reexamination Certificate

active

07403341

ABSTRACT:
A zoom lens system comprising, in order from an object side: a first lens unit comprising two lens components; and a second lens unit comprising one lens component, during zooming, a space between the first lens unit and the second lens unit changing, the first lens unit and the second lens unit having aspherical surfaces, at least one aspherical surface of the first lens unit satisfying the following condition: R1/hl 1.35, wherein R1 denotes a paraxial radius of curvature of the at least one aspherical surface, and hi denotes a length from a first intersection between a chief ray reaching a point of maximum image height on an image surface and the at least one aspherical surface to an optical axis in the wide-angle end at a time when the chief ray enters the zoom lens system with an angle of incidence equal to or larger than 36 degrees.

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patent: 09-033810 (1997-02-01), None

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