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US4974947A Refractive index distribution type meniscus lens and optics 失效
折射率分布型弯月透镜和光学元件

Refractive index distribution type meniscus lens and optics
摘要:
A refractive index distribution type meniscus-shaped single lens characterized in that it has a refractive index distribution in which the refractive index decreases along the optic axis thereof from a convex surface to a concave surface and the difference .DELTA.N in refractive index between the convex surface and the concave surface on the optic axis satisfies .DELTA.N.gtoreq.0.15.
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