Eyepiece having a radial gradient index lens
AssigneeOlympus Optical Co., Ltd.
InventorKatsuhiro Takada
Life of this patent
Estimating the term…
Abstract
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.degree. or more and arranged that aberrations thereof, especially astigmatism and distortion, are corrected satisfactorily favorably.
Claims6
An eyepiece comprising a plurality of lenses, comprising, in the order from the eye point side, a first lens component having positive refractive power which comprises a positive meniscus lens having a concave surface on the eye point side, and a second lens component located in rear of said first lens component, said eyepiece being arranged with said first lens component comprising a graded refractive index lens formed so that the refractive index thereof is graded according to the radial distance from the optical axis.
Dependencies are inferred from the claim text.