发明名称 |
Printer head with linear array of individually addressable diode-lasers |
摘要 |
A printer head for computer-to-plate printing includes a linear array of individually addressable diode-lasers and a linear array of photodetectors. The number and spacing of the photodetectors is the same as the number and spacing of the diode-lasers. The diode-lasers emit in forward and reverse directions. The diode-lasers and photodetectors are aligned parallel to each other such that reverse-emitted light output of each diode-laser is incident on a corresponding photodetector. Each photodetector output is monitored by a dedicated controller/driver sub-circuit that regulates drive current supplied to the diode-laser. The drive current is regulated according to a comparison of the monitored photodetector output with a reference current individually calibrated in each sub-circuit. Calibration data for each sub-circuit is obtained from a measurement of forward-emitted output power of its corresponding diode-laser compared with a desired target forward-emitted power. The individual calibration of the sub-circuits provides that each of the diode-lasers emits at the target output power.
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申请公布号 |
US6603498(B1) |
申请公布日期 |
2003.08.05 |
申请号 |
US20000724394 |
申请日期 |
2000.11.28 |
申请人 |
COHERENT, INC. |
发明人 |
KONNUNAHO TUOMO;ASONEN HARRY;SALOKATVE ARTO K.;NAEPPI JARI TAPANI |
分类号 |
B41J2/44;B41J2/45;B41J2/455;G06K15/12;H01S5/042;H01S5/0683;(IPC1-7):B41J2/435 |
主分类号 |
B41J2/44 |
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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