Eyepiece optical system and imaging apparatus
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United States of America Patent
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Jan 12, 2016
Grant Date -
Jun 25, 2015
app pub date -
Dec 17, 2014
filing date -
Dec 20, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
An eyepiece optical system substantially composed of a first lens having a positive refractive power with a convex surface on the eye point side, a second lens having a negative refractive power with a concave surface on the object side, and a third lens having a positive refractive power with an absolute value of radius of curvature of the eye point side surface being smaller than an absolute value of radius of curvature of the object side surface, disposed in order from the object side. The first lens to the third lens are all single lenses and, when the average refractive index of the first lens to the third lens is taken as NdH, the eyepiece optical system satisfies a conditional expression (1): 1.80
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