EYEPIECE SYSTEM AND IMAGE OBSERVATION APPARATUS
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United States of America Patent
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Jul 7, 2016
app pub date -
Aug 5, 2014
filing date -
Aug 9, 2013
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Abstract
An eyepiece lens system having a large amount of allowable eccentricity. This eyepiece system forms a magnified virtual image of an observation object, and the eyepiece system has a horizontal angle of view of 40 degrees or more. The maximum amount of eccentricity S that makes the proportion of the amount of change, Δ mm, in tangential field curvature in the amount of eccentricity, S mm, between the optical axis Ax and an observer's eye satisfy Condition (1), namely, −0.25<Δ/S<0, at all image heights is 3 mm or more.
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