Optical element, optical pick-up device and manufacturing method of the optical element
AssigneeKonica Corporation
InventorsHiroshi Nagoya, Shigeru Hosoe
Life of this patent
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Abstract
An optical element for recording and/or reproducing information of an optical information recording medium, includes an optical element body having an incident surface and an opposite surface opposite to the incident surface, A light flux coming from a light source at an outside is introduced to be incident into an inside of the optical element body and is reflected several times in the inside of the optical element body so that the light flux is converged on the opposite surface; and the incident surface is a refractive surface, is convex toward the light source side and includes an optical axis.
Claims26
An optical element for recording and/or reproducing information of an optical information recording medium, comprising:
- an optical element body having an incident surface and an opposite surface opposite to the incident surface, wherein a light flux coming from a light source at an outside is introduced to be incident into an inside of the optical element body and is reflected several times in the inside of the optical element body so that the light flux is converged on the opposite surface;
- and
- wherein the incident surface comprises:
- a convex region including an optical axis;
- and
- a surrounding region surrounding the convex region and having a different radius of curvature from a radius of curvature of the convex region and
- the convex region is a refractive surface and is convex toward the light source side.
An optical pickup apparatus, comprising:
- a light source to emit a light flux;
- an optical element to converge the light flux from the light source onto an information recording plane of an optical information recording medium;
- and
- a photo-detector to detect the light flux from the optical information recording medium;
- wherein an optical element body of the optical element has an incident surface and an opposite surface opposite to the incident surface, the light flux coming from the light source is introduced to be incident into an inside of the optical element body and is reflected several times in the inside of the optical element body so that the light flux is converged on the opposite surface, and
- wherein the incident surface comprises:
- a convex region including an optical axis;
- and
- a surrounding region surrounding the convex region and having a different radius of curvature from a radius of curvature of the convex region and
- the convex region is a refractive surface and is convex toward the light source side.
Dependencies are inferred from the claim text.