| 摘要 |
<p>A hand-held bar code reader includes an elongated casing having an opening at one end, and a light source (34) for projecting a beam to a composite optical element (38) mounted adjacent said opening. Reflecting surfaces (64, 66) of the optical element (38) reflect the beam on to a mirror (32) mounted on a rotatable shaft (30) driven by a motor (28) mounted inside the casing. The mirror (32) deflects the light beam in sequence to a series of further mirrors (42) mounted around the interior periphery of the casing, the further mirrors (42) serving to direct light beams in a scanning manner at a coded label through said opening in the casing. The optical element (38) also includes a collection portion (44) for focusing light reflected from the coded label on to a photodetector (48) which is mounted alongside the shaft (30) and which generates signals representing the data stored on the label. The invention achieves a compact form of construction for the reader.</p> |
