Eyepiece having a radial gradient index lens

An eyepiece comprising at least one graded refractive index (GRIN) lens formed that the refractive index thereof is graded according to the radial distance from the optical axis, the eyepiece being arranged to comprise a small number of lenses and to have a long eye relief about 0.8 time of the foca...

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Bibliographic Details
Main Author TAKADA; KATSUHIRO
Format Patent
LanguageEnglish
Published 15.03.1988
Edition4
Subjects
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
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Summary:An eyepiece comprising at least one graded refractive index (GRIN) lens formed that the refractive index thereof is graded according to the radial distance from the optical axis, the eyepiece being arranged to comprise a small number of lenses and to have a long eye relief about 0.8 time of the focal length and an angle of view of 45 DEG or more and arranged that aberrations thereof, especially astigmatism and distortion, are corrected satisfactorily favorably.
Bibliography:Application Number: US19860893082