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. 10, 1989
Filed:
Sep. 04, 1987
Tadao Nagai, Sagamiko, JP;
Kenichi Sato, Tokyo, JP;
TEAC Corporation, Tokyo, JP;
Abstract
An optical recording and reproducing apparatus comprises an optical disc having a recording surface; a laser diode emitting a laser beam; an optical lens for changing the laser beam into a parallel laser beam; a diffraction grating for diffracting the parallel laser beam and generating 0-order and .+-.1st diffracted lights, a light intensity ratio of each of the .+-.1st diffracted lights to the 0-order diffracted light ranging from 8:1 to 9:1; and an optical system for forming spot lights of the 0-order and .+-.1st diffracted lights on the recording surface of the disc and extracting the 0-order and .+-.1st diffracted lights which have been reflected from on the recording surface.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile