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:
Aug. 20, 2002
Filed:
Dec. 16, 1999
Applicant:
Inventor:
Takayuki Hoshino, Osaka, JP;
Assignee:
Minolta Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 7/00 ;
U.S. Cl.
CPC ...
G11B 7/00 ;
Abstract
A near-field optical recording or reading apparatus has at least a tip portion of an optical fiber probe covered by a conductive layer. A recording medium is provided with another conductive layer. The conductive layer of the recording medium is connected to a high frequency power source, and this conductive layer is grounded. The electrostatic capacity between the conductive layers of the optical filer probe and recording layer is detected as a voltage value at a connector pin between the power source and a resistor; this voltage value is fed back to control the gap between the tip of the optical fiber probe and the recording medium.