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:
Apr. 01, 2008
Filed:
Jan. 07, 2005
Hidenori Wada, Uji, JP;
Tetsuo Saimi, Hirakata, JP;
Daisuke Ogata, Amagasaki, JP;
Seiji Nishino, Osaka, JP;
Hiroaki Yamamoto, Kawabe-gun, JP;
Shin-ichi Kadowaki, Sanda, JP;
Yoshiaki Komma, Hirakata, JP;
Hidenori Wada, Uji, JP;
Tetsuo Saimi, Hirakata, JP;
Daisuke Ogata, Amagasaki, JP;
Seiji Nishino, Osaka, JP;
Hiroaki Yamamoto, Kawabe-gun, JP;
Shin-ichi Kadowaki, Sanda, JP;
Yoshiaki Komma, Hirakata, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
The invention presents an optical element with which an optical head can be configured, in which there is little deterioration of the correctional effect when the objective lens shifts, as well as an optical head and an optical recording/reproducing apparatus using such an optical element. The invention also presents a novel optical recording/reproducing apparatus and optical recording/reproducing method. The optical element, includes a first voltage application electrode, a first opposing electrodearranged in opposition to the first voltage application electrode, and a first phase changing layerarranged between the first voltage application electrodeand the first opposing electrode. By changing a voltage between the first voltage application electrodeand the first opposing electrode, a phase that converts plane waves into spherical waves is imparted on light that is incident on the first phase changing layer