Nippon Sheet Glass Company, Limited

Hiroyuki Ichikawa

Minoru Toyama

Hisami Nishi

A collimator lens to be used for an optical recording/reproducing apparatus is constituted by a refractive index distribution type lens to satisfy specific conditions, thereby the invention provides the collimator lens which is good in the productivity and has the wave surface aberration being equivalent to or better than that of a collimator lens using a spherical lens.

Collimator lens

An element of the invention focuses and projects a parallel or substantially parallel light beam onto an optical information recording medium. The element consists of a transparent columnar body having a convex surface as the input surface and a flat surface as the output surface.

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Takarazuka, Japan

Hiroyuki Ichikawa