| 摘要 |
A compact optical scanning system comprises a portable enclosure structure having a cover portion which includes a glass enclosed aperture over which a UPC label attached to a purchased merchandise item is moved. Mounted within the enclosure below the cover portion is a laser whose output coherent light beam is reflected along a path extending in a direction parallel to the cover portion by mirrors mounted on a shelf extending between opposite side walls of enclosure. The laser beam is directed through an aperture in a collection mirror to a bifocal lens which includes a second lens for focusing the received laser beam at the aperture by directing the laser beam at a mirror mounted so as to reflect the laser beam at a six-sided multi-faceted rotating mirrored spinner mounted on the floor of the enclosure directly beneath the shelf and the bifocal lens. The rotating mirrored spinner directs the laser beam at a plurality of pattern mirrors which redirect the received laser beam towards the aperture, forming a scanning pattern thereat for scanning the UPC label. The reflected light beams from the label are retro-directed via the pattern mirrors, the rotating mirrors, the deflecting mirror and the bifocal lens which focuses the reflected light beams at a photodetector through a collection mirror which filters out light having a waveform greater than the waveform of the laser beam to a colored meniscus lens mounted on the photodetector member. The meniscus lens filters out light from the laser beam having wavelengths which are less than the wavelength of the laser beam, resulting in the transmission of reflected light beams to the photodetector member having a band pass centered on the wavelength of the laser light beam.
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