发明名称 |
Measurement of paper speed using laser speckle detection |
摘要 |
In a postage printing device, a printer is employed to print postage indicia on mail pieces. The printer is preferably a noncontact printer such as an ink-jet printer. Printing occurs as the mail piece moves relative to the print head of the printer, which requires that reliable motion information (e.g. a print clock signal) be made available to the electronics driving the print head. The reliable motion is provided in a noncontact way, preferably by directing a laser beam toward the mail piece and detecting a moving speckle pattern in the light scattered from the mail piece.
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申请公布号 |
US6220686(B1) |
申请公布日期 |
2001.04.24 |
申请号 |
US19980023457 |
申请日期 |
1998.02.13 |
申请人 |
ASCOM HASLER MAILING SYSTEMS AG |
发明人 |
LüDI MANFRED;MOY CHRISTIAN |
分类号 |
B41J11/00;B41J11/42;B41J13/12;G07B17/00;(IPC1-7):B41J3/00 |
主分类号 |
B41J11/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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