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United States Patent 5,821,497
Yamazaki, et. al. Oct. 13, 1998

Laser marking system and laser marking method

Abstract

A laser marking system and method with a laser oscillator generating a laser beam that is scanned in a single direction onto a mask (such as a liquid crystal) that displays sequentially a plurality of divided pattern blocks, and a second deflector that deflects the scanned laser beams onto corresponding portions of the surface of a workpiece so as to mark on the surface of the workpiece a combination of the divided pattern blocks . In another embodiment a plurality of masks and a second optical system for combining the beams from the masks can be used to create the mark. The system can be used with a conveyor and a loading and unloading unit using a controller.


Inventors: Yamazaki; Taku (Pittsburgh, PA); Matsumura; Yukinori (Isehara, JP); Tsuda; Yukihiro (Isehara, JP); Mori; Akira (Chigasaki, JP).
Assignee: Kabushiki Kaisha Seisakusho (Tokyo, JP).
Appl. No.: 495,451
Filed: Aug. 28, 1995
PCT Filed: Jan. 20, 1994
PCT No: PCT/JP94/00069
371 Date: Aug. 28, 1995
102(e) Date: Aug. 28, 1995
PCT Pub. No.: WO94/16858
PCT Pub. Date: Aug. 4, 1994

Foreign Application Priority Data
Jan. 29, 1993 [JP] 5-034418
Jan. 29, 1993 [JP] 5-034419
Intl. Cl. : B23K 26/00
Current U.S. Cl.: 219/121.69; 219/121.68; 219/121.73
Field of Search: 219/121.68, 121.69, 121.82, 121.73; 359/202, 203, 204; 353/34, 36; 347/256, 258, 255, 229

References Cited | [Referenced By]

U.S. Patent Documents
4,638,144Jan., 1987Latta, Jr. 219/121.68
4,818,835Apr., 1989Kuwabara et al. 219/121.85
5,132,510Jul., 1992Klingel et al. 219/121.82
5,192,848Mar., 1993Miyakawa et al. 219/121.82
5,260,542Nov., 1993Ishiguro et al. 219/121.68
5,260,728Nov., 1993Yoshioka et al. 353/34
5,309,273May, 1994Mori et al. 219/121.68
5,608,563Mar., 1997Matsumara et al. 359/202

Foreign Patent Documents
215389Mar., 1987EP 219/121.82
57-14981Jan., 1982JP
2-15887Jan., 1990JP
2-96714Apr., 1990JP
2-187288Jul., 1990JP
2-187287Jul., 1990JP
2-268988Nov., 1990JP
2-284786Nov., 1990JP
4-169416Jun., 1992JP
4-98384Aug., 1992JP
4-339581Nov., 1992JP 219/121.68
93-23781Nov., 1993WO
Primary Examiner: Evans; Geoffrey S.
Attorney, Agent or Firm: Sidley & Austin
24 Claims, 21 Drawing Figures

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