| 摘要 |
Aiming of an imaging reader at direct part markings (DPM) on workpieces is enhanced by emitting an aiming light beam during aiming, and by optically modifying the aiming light beam during the aiming to generate an aiming light pattern having an outer bright region illuminated by the aiming light beam and visible to an operator to enable the operator to manually position the bright region to entirely surround at least part of the DPM, and an inner dark region not illuminated by the aiming light beam and surrounded by the bright region. The dark region contains the part of the DPM code to be imaged and read by the reader after the aiming.
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