| 摘要 |
A reader for, and a method of, electro-optically reading a symbol in a range of working distances include a housing, a data capture assembly supported by the housing for directing light at a variable power level at the symbol in a plurality of successive scans, and for detecting return light from the symbol, and a controller for controlling the data capture assembly by increasing the power level of the light during at least one of the successive scans to enable detection of the symbol located at an increased working distance from the reader, and by decreasing the power level of the light during at least another of the successive scans to maintain an output power level within safety limits. Preferably, the increased power level alternates with the decreased power level during successive scans.
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