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:
Nov. 18, 1997
Filed:
Aug. 30, 1996
Minoru Isobe, Tokyo, JP;
Yukio Nakamura, Tokyo, JP;
Oki Electric Industry Co., Ltd., Tokyo, JP;
Abstract
A method for optically writing/reading information is disclosed, where information is written onto and read from an information recording medium. Light is emitted from a light emitting element and is split into a zero-order diffracted light and a first-order diffracted light by way of a diffraction grating. The zero-order diffracted light and the first-order diffracted light are focused from the diffraction grating onto the information recording medium such that at least a portion of at least the first-order diffracted light is reflected from the information recording medium. The reflected first-order diffracted light is focused from the information recording medium onto a light receiving element paired with and positioned adjacent the light emitting element.