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. 12, 2002
Filed:
May. 25, 2000
Applicant:
Inventors:
Assignee:
Hitachi Via Mechanics, Ltd., Ebina, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B23K 2/636 ;
U.S. Cl.
CPC ...
B23K 2/636 ;
Abstract
The invention provides a method and an apparatus of making a hole in a printed circuit board, which improve the quality of a hole shape and the processing speed. In accordance with the invention, a control apparatus controls a laser oscillator and a galvano mirrors so as to form a hole while gradually reducing a pulse width in each step with respect to one hole. As a result of this, no insulating material is left on the bottom portion of the hole, and it is possible to make a hole having an intended shape, particularly, having a desired diameter of the hole bottom.