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. 07, 2003
Filed:
May. 19, 1999
Naoto Sugawara, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A magnetic disk unit which can provide a sufficient PD output of laser beams for optical tracking. The magnetic disk unit comprises a diffraction grating for splitting laser beams from a laser source into a plurality of beams; an aperture for narrowing a plurality of laser beams from the diffraction grating and light beams reflected from the recording medium; an objective lens for converging a plurality of laser beams, radiating the laser beams onto the recording medium, and guiding light beams reflected from the recording medium to the aperture; a beam splitter for splitting the reflected light beams having passed through the aperture; and a light receiver for receiving light beams split by the beam splitter. The objective lens is an objective lens telecentric to the image side.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile