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. 30, 1996
Filed:
May. 23, 1994
Friedrich Fleck, Munich, DE;
Klaus-Dieter Jorgens, Baldham, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
A plurality of light-emitting diode chips (2) densely packed in the form of rows is associated with driver chips (34) and associated drive chips (3) on both sides. The printing information is supplied from a printer control (6) via a bus system (4, 4' and 5, 5'). Each light-emitting diode chip is subdivided into n groups of light-emitting diodes (for example LED1, LED3, LED5 . . . LED31 and LED98, LED100 . . . LED128), which are arranged geometrically offset with respect to one another transversely to the main direction of the diode row. Each drive chip contains a switching unit (32) for generating internal sequence control signals (for example SWE1, SWE2, I-CLK) and n part-circuits (33/0 to 33/3) associated with the n groups of light-emitting diodes for the simultaneous processing of the printing information into temporally staggered drive signals (DS). Thus, the respective light-emitting diode groups are activated with a temporal offset depending on the geometric offset in order to generate a printed image line which is assembled section by section.