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:
May. 01, 2001
Filed:
Jun. 24, 1999
Applicant:
Inventors:
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G08B 2/100 ;
U.S. Cl.
CPC ...
G08B 2/100 ;
Abstract
It is an object of the invention to provide a LED array, in which faults of all the diodes can be instantaneously detected, even when an optical printer is operating, and various kinds of faults of the LEDs can be discriminated. In the LED array comprising plural LEDs arranged along a lone, each LED is provided with a comparator, which compares a terminal voltage of the LED with a variable reference voltage. The kind of fault of the LED can be discriminated on the basis of a relation between the reference voltage applied to the comparator and an output voltage thereof.