| United States Patent | 6,455,805 |
| Boon , et al. | September 24, 2002 |
A stainless steel plate establishes a mask plate for a laser trimming tray. The plate has several openings through which laser light can be directed onto semiconductor chips borne by the tray. The plate is supported on pneumatic pistons which can raise the plate to allow a tray to be disposed underneath, and then the plate is lowered and pressed against the tray, with the weight of the plate flattening and straightening the tray to promote precise laser cuts of the chips on the tray.
| Inventors: | Boon; Thomas Wong Han (Singapore, SG); Min; Simon Cha Ser (Singapore, SG); Boon; Ronnie Lee Hock (Singapore, SG); Chuan; Koh Hock (Singapore, SG) |
| Assignee: | Advanced Micro Devices, Inc. (Sunnyvale, CA) |
| Appl. No.: | 764624 |
| Filed: | January 17, 2001 |
| Current U.S. Class: | 219/121.67 |
| Intern'l Class: | B23K 026/38 |
| Field of Search: | 219/121.67,121.68,121.69,121.7,121.71,121.72,121.85,121.86 |
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| 5099101 | Mar., 1992 | Millerick et al. | |
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| 5883357 | Mar., 1999 | Newman et al. | 219/121. |
| 6040094 | Mar., 2000 | Otsuka et al. | 428/195. |
| 6043453 | Mar., 2000 | Arai | 219/121. |
| 6172330 | Jan., 2001 | Yamamoto et al. | 219/121. |
| Foreign Patent Documents | |||
| 9207313 | Aug., 1997 | JP. | |
| 11314189 | Nov., 1999 | JP. | |
| 2000288753 | Oct., 2000 | JP. | |