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US Patent 7952800 Variable power relay optical system and microscope equipped therewith

Patent 7952800 was granted and assigned to Nikon (Somalia) on May, 2011 by the United States Patent and Trademark Office.

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Patent
Patent
1

Patent attributes

Current Assignee
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Nikon (Somalia)
1
Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
1
Patent Number
79528001
Patent Inventor Names
Hiroaki Nakayama1
Date of Patent
May 31, 2011
1
Patent Application Number
127075661
Date Filed
February 17, 2010
1
Patent Primary Examiner
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Thong Nguyen
1
Patent abstract

A variable power relay optical system comprising: a variable power lens performing zooming a secondary image based on light from a primary image; and a rear group forming the secondary image based on the light passing through the variable power lens; the variable power lens consisting of, in order from the primary image side, a first group having positive power, a second group having negative power, a third group having positive power, and a fourth group having positive power, upon zooming from a high magnification end to a low magnification end, the fourth group being moved to the secondary image side, and a distance between the first group and the second group increasing, positions of the primary image and the secondary image, an entrance pupil of the variable power relay optical system, a pupil of the variable power lens, and an exit pupil of the variable power relay optical system being substantially kept constant, and the pupil of the variable power lens being disposed to the secondary image side of the last surface of the variable power lens.

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