Laser power control arrangements in electro-optical readers

Details Laser power control arrangements in electro-optical readers Laser power control arrangements in electro-optical readers

2005-09-30

2009-10-27

Harvey, Minsun (Department: 2828)

Coherent light generators

Particular component circuitry

Having fault protection circuitry

C372S038010, C372S038020, C372S038070

Reexamination Certificate

active

07609736

ABSTRACT:
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.

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Preliminary Report on Patentability dated Mar. 19, 2009 in related application PCT/US2006/034015.

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