| 摘要 |
An optical reader comprising: an image sensor array of pixels for converting light reflected from a target containing a machine readable indicia into output signals representative thereof; a housing for holding the image sensor array; a processor for decoding the output signals; receive optics for directing light from the target to the image sensor, the optics having a focal point; a generally cylindrical barrel for containing the receive optics, the barrel having a protrusion provided thereon; a generally cylindrical sleeve for receiving the barrel, the sleeve being secured to the housing and having a shoulder for engagement with the protrusion, wherein moving the protrusion along the shoulder facilitates focusing of the receive optics relative to the image sensor.
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