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. 31, 1993
Filed:
Aug. 19, 1991
Applicant:
Inventors:
Kenichi Iga, Machida, JP;
Kazuto Senda, Hachiouji, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01S / ;
U.S. Cl.
CPC ...
372 46 ; 369 4423 ; 3692752 ;
Abstract
The present invention relates to a laser diode and a highly precise light information processor using the same, particularly a laser diode which controls the diameter of a current flowing through an active layer and changes the emitting area of the active layer, a laser printer which is suited to half tone expression with high image quality by using the above semiconductor laser device, and an optical disk device which can record data surely.