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. 01, 2004
Filed:
Apr. 11, 2001
Yoko Shinohara, Chiba, JP;
Yasuyuki Mitsuoka, Chiba, JP;
Manabu Oumi, Chiba, JP;
Nobuyuki Kasama, Chiba, JP;
Hidetaka Maeda, Chiba, JP;
Kenji Kato, Chiba, JP;
Takashi Niwa, Chiba, JP;
Seiko Instruments Inc., Chiba, JP;
Abstract
A near-field optical head capable of rapid recording and/or reproducing of the information is provided. The near-field optical head condenses the light from the light source and irradiates the light on the minute opening . Then, by means of detecting the reflected light from the light condensing mark provided on the circumference of the minute opening , the relative position between the light condensing point condensed by the lens and the light condensing mark is detected so that the light condensing point is controlled to follow the light condensing mark . Thus, intensive and constant near-field light can be generated in the minute opening and a signal having high S/N can be obtained even by a rapid scanning of the minute opening over the recording medium so that rapid recording and/or reproducing of the information is made possible.