Superwide-angle lens optical system, and imaging unit and...

Details Superwide-angle lens optical system, and imaging unit and... Superwide-angle lens optical system, and imaging unit and...

2006-11-14

2006-11-14

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

Reverse telephoto

C359S726000

Reexamination Certificate

active

07136236

ABSTRACT:
The invention relates to a superwide-angle lens optical system having a long back-focus lens arrangement and comprising a relay lens group. The optical system is constructed of, in order from an object side thereof, an objective lens group Ob having positive refracting power, a primary image-formation plane formed by the objective lens group Ob and a relay lens group R1having positive refracting power. A field stop FS is positioned at or near the primary image-formation plane, and condition (1-1) is satisfied.in-line-formulae description="In-line Formulae" end="lead"?h/fo>1.8  (1-1)in-line-formulae description="In-line Formulae" end="tail"?Here fois the focal length of the objective lens group Ob, and h is the diameter of an image circle on the primary image-formation plane.

REFERENCES:
patent: 4647161 (1987-03-01), Muller
patent: 4812024 (1989-03-01), Mukaiya
patent: 5434713 (1995-07-01), Sato
patent: 2002-072085 (2002-03-01), None

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