| http://www.w3.org/ns/prov#value | - Co., Ltd.Compound objective lens having two focal pointsUS5822135May 1, 1996Oct 13, 1998Samsung Electronics Co., Ltd.Lens device including a light controlling mechanism and an optical pickup apparatus using a lens deviceUS5844879Mar 31, 1997Dec 1, 1998Sharp Kabushiki KaishaOptical head including ring-shaped light blocking or light non-converging portionUS5881034Aug 18, 1997Mar 9, 1999Sony Corpora
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