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. 04, 2003
Filed:
Sep. 23, 2002
Applicant:
Inventors:
Assignee:
Nitto Denko Corporation, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B23K 2/638 ;
U.S. Cl.
CPC ...
B23K 2/638 ;
Abstract
An ultraviolet beam with high energy density is applied for forming an opening in an electric conductor layer in a flexible wiring board whereas an ultraviolet beam with low energy density is applied for forming an opening in an electrically insulating layer in the flexible wiring board. As a result, excessive heat energy applied for forming a via hole can be reduced, so that the problems can be reduced. In this manner, high quality of the via hole and delicate and accurate processability due to use of the ultraviolet laser beam can be combined to achieve formation of fine patterns densely in the flexible wiring board.