| United States Patent | 5,821,497 |
| Yamazaki, et. al. | Oct. 13, 1998 |
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 |
| 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 |
| 4,638,144 | Jan., 1987 | Latta, Jr. | 219/121.68 |
| 4,818,835 | Apr., 1989 | Kuwabara et al. | 219/121.85 |
| 5,132,510 | Jul., 1992 | Klingel et al. | 219/121.82 |
| 5,192,848 | Mar., 1993 | Miyakawa et al. | 219/121.82 |
| 5,260,542 | Nov., 1993 | Ishiguro et al. | 219/121.68 |
| 5,260,728 | Nov., 1993 | Yoshioka et al. | 353/34 |
| 5,309,273 | May, 1994 | Mori et al. | 219/121.68 |
| 5,608,563 | Mar., 1997 | Matsumara et al. | 359/202 |
| 215389 | Mar., 1987 | EP | 219/121.82 |
| 57-14981 | Jan., 1982 | JP | |
| 2-15887 | Jan., 1990 | JP | |
| 2-96714 | Apr., 1990 | JP | |
| 2-187288 | Jul., 1990 | JP | |
| 2-187287 | Jul., 1990 | JP | |
| 2-268988 | Nov., 1990 | JP | |
| 2-284786 | Nov., 1990 | JP | |
| 4-169416 | Jun., 1992 | JP | |
| 4-98384 | Aug., 1992 | JP | |
| 4-339581 | Nov., 1992 | JP | 219/121.68 |
| 93-23781 | Nov., 1993 | WO |