Eyepiece optical system
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United States of America Patent
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Nov 21, 2017
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app pub date -
Jan 19, 2016
filing date -
Jan 21, 2015
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Abstract
An eyepiece optical system includes a focal-plane plate, having a positive refractive power on one side and a diffusion surface on the other side thereof; a reflector which reflects light rays of an object image, formed on the diffusion surface, a predetermined number of times; an optical lens group, by which the object image is observed, in that order along an optical path from the object side to the viewing side; and a condenser lens element, having a positive refractive power, provided between the focal-plane plate and the reflector, the condenser lens element having an aspherical surface formed on at least one side thereof. At least one of the aspherical surface of the condenser lens element has a profile, when viewed macroscopically, such that the positive refractive power thereof increasingly weakens with respect to a direction away from the optical axis.
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