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:
Dec. 29, 2009
Filed:
Jul. 20, 2006
Takao Furukawa, Ebina, JP;
Hiroshi Kawasaki, Ebina, JP;
Toshiyuki Iwata, Ebina, JP;
Katsuhiro Nagasawa, Ebina, JP;
Takahiko Yamashita, Ebina, JP;
Takao Furukawa, Ebina, JP;
Hiroshi Kawasaki, Ebina, JP;
Toshiyuki Iwata, Ebina, JP;
Katsuhiro Nagasawa, Ebina, JP;
Takahiko Yamashita, Ebina, JP;
Hitachi Via Mechanics, Ltd., Kanagawa, JP;
Abstract
There is provided a drilling method capable of improving machining accuracy of a printed board drilling apparatus as a whole by decreasing dispersion of the machining accuracy even if it is a multi-spindle printed board drilling apparatus. A misalignment of an axial center of a drill with respect to a designed axial center in X and Y directions is detected in advance per a certain number of revolutions of each spindle that rotates the drill. Holes of two or more types of diameter are made on a printed board by making holes of at least one diameter, e.g., an exposure master hole, per each spindle and by making holes of all other diameters almost simultaneously by all of the spindles.