IDiyas

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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.:

US 9607744 B1

PDFFull Text
Date of Patent:
Mar. 28, 2017

Filed:

Nov. 07, 2013

Laser processing apparatus and laser irradiation method

Applicant:

Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;

Inventors:

Koji Hirano, Kisarazu, JP;

Hirofumi Imai, Kisarazu, JP;

Hideyuki Hamamura, Futtu, JP;

Assignee:

NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;

Attorney:

Birch, Stewart, Kolasch & Birch, LLP

Primary Examiner:

Samuel M Heinrich

Int. Cl.
CPC ...
C21D 8/02 (2006.01); C21D 8/10 (2006.01); C21D 8/12 (2006.01); H01F 1/147 (2006.01); C21D 1/34 (2006.01); C21D 6/00 (2006.01); C21D 9/46 (2006.01); H01F 1/16 (2006.01); H01F 41/02 (2006.01); C22C 38/06 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01);
U.S. Cl.
CPC ...
H01F 1/14775 (2013.01); C21D 1/34 (2013.01); C21D 6/008 (2013.01); C21D 8/1294 (2013.01); C21D 9/46 (2013.01); C22C 38/001 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); H01F 1/16 (2013.01); H01F 41/02 (2013.01); C21D 8/02 (2013.01); C21D 8/10 (2013.01); C21D 8/12 (2013.01);
Abstract

A laser processing apparatus includes a laser irradiation unit has a structure providing an intensity distribution of the laser beam focused on the grain-oriented electrical steel sheet on a cross-section in a direction perpendicular to the scanning direction on the grain-oriented electrical steel sheet so as to satisfy Ib/Ia≦2, where Raand Raare distances between the centroid of the intensity distribution and positions at which the intensity integration value from the centroid of the intensity distribution is 43% of the total intensity integration value, beam intensities Iaand Iaare intensities of the laser beam corresponding to Raand Ra, respectively, Ia is the average value of Iaand Iaand Ib is the beam intensity at the centroid of the intensity distribution.

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