Patent Number: 6,512,640

Title: Objective lens for pickup and light pickup apparatus

Abstract: An objective lens for use in an optical pickup apparatus to record or reproduce information in an optical information recording medium, comprises an aspheric surface, wherein the following conditional formula is satisfied: 1.1.ltoreq.d1/f.ltoreq.3 where d1 represents axial lens thickness and f represents a focal length.

Inventors: Ota; Kohei (Tokyo, JP), Kimura; Tohru (Tokyo, JP)

Assignee: Konica Corporation

International Classification: G11B 7/125 (20060101); G11B 7/135 (20060101); G02B 013/18 (); G02B 017/00 (); G11B 007/00 (); G11B 007/35 ()

Expiration Date: 01/28/2020