The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 06, 2000
Filed:
Apr. 13, 1999
Masahiro Kume, Shiga, JP;
Yuzaburo Ban, Osaka, JP;
Isao Kidoguchi, Hyogo, JP;
Satoshi Kamiyama, Hyogo, JP;
Ayumu Tsujimura, Osaka, JP;
Akihiko Ishibashi, Osaka, JP;
Yoshiaki Hasegawa, Osaka, JP;
Ryoko Miyanaga, Nara, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
Between a semiconductor laser diode and an optical disk, a collimator lens for collimating a laser beam output from the semiconductor laser diode, a liquid crystal optical shutter for attenuating the collimated beam having passed through the collimator lens, and a beam splitter for splitting reflected light from the optical disk are disposed. In addition, a collective lens for collecting the collimated beam obtained by the collimator lens on a data holding surface of the optical disk is further disposed.