发明名称 |
Laser power control arrangements in electro-optical readers |
摘要 |
Laser power control arrangements interrupt power to a laser used in electro-optical readers upon detection of an over-power condition not conforming to preestablished regulatory standards. In one embodiment, during an operational mode, a difference between laser drive currents at two operating points is compared to a difference between laser drive currents at the same two operating points during a calibration mode. The over-power condition is recognized when the difference during the operational mode exceeds the difference during the calibration mode by a predetermined amount. In another embodiment, the laser is only energized to emit the beam at a reduced power level well below regulatory standards for staring at even if a motor drive failed.
|
申请公布号 |
US7609736(B2) |
申请公布日期 |
2009.10.27 |
申请号 |
US20050239745 |
申请日期 |
2005.09.30 |
申请人 |
SYMBOL TECHNOLOGIES, INC. |
发明人 |
DIFAZIO COSTANZO;GUREVICH VLADIMIR;GIEBEL JAMES;SCHNEIDER GARY G.;BLASCZAK MATTHEW;WEITZNER MARK A.;BARKAN EDWARD |
分类号 |
H01S3/00 |
主分类号 |
H01S3/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|