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:
Jan. 19, 2010
Filed:
Mar. 19, 2004
Kazuhiro Tsuchida, Higashihiroshima, JP;
Toshiya Nagahama, Kashiba, JP;
Keiji Sakai, Nara, JP;
Tetsuo Ueyama, Nara, JP;
Katsushige Masui, Higashihiroshima, JP;
Naotaka Otsuka, Mihara, JP;
Kazuhiro Tsuchida, Higashihiroshima, JP;
Toshiya Nagahama, Kashiba, JP;
Keiji Sakai, Nara, JP;
Tetsuo Ueyama, Nara, JP;
Katsushige Masui, Higashihiroshima, JP;
Naotaka Otsuka, Mihara, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
An object of the invention is to provide a splitter, a light emitter, and an optical pickup apparatus which can realize a stable track servo. Because of the structure of an optical system including an objective lens () and a hologram pattern (), even when the hologram pattern () is irradiated with a reflected light from one recording layer other than another recording layer in a focused state, first and second TES splitting portions () are not irradiated with the reflected light from the one recording layer, but the reflected light is led to an axis vicinity portion () only. Accordingly, light reception by first and second TES light receiving portions () is prevented, accurate track position information and deviation information can be positively acquired, and troubles such as the objective lens () being driven beyond a movable range can be eliminated.