Patent ID: 6061324
Filing Date: 2000-05-09
Classification: G02B,G11B

Abstract:
An optical pickup apparatus comprising:a light source for emitting light flux;a converging optical system having an optical axis, a first portion, a second portion, and a third portion, the second portion being farther from the optical axis than the first portion, the third portion being farther from the optical axis than the second portion, andan image sensor,wherein the first portion and the third portion are capable of converging the light flux on a first information recording plane of a first optical information recording medium having a first transparent substrate of thickness t1, to reproduce information recorded in the first optical information recording medium, andwherein the first portion and the second portion are capable of converging the light flux on a second information recording plane of a second optical information recording medium having a second transparent substrate of thickness t2, to reproduce information recorded in the second optical information recording medium wherein t2 is greater than t1, andwherein the image sensor is capable of receiving light flux reflected from the first information recording plane or the second information recording plane.