Registers – Coded record sensors – Particular sensor structure
Patent
1989-06-13
1991-09-24
Levy, Stuart S.
Registers
Coded record sensors
Particular sensor structure
235454, G06K 712
Patent
active
050515675
ABSTRACT:
A bar code reader is described which can accurately read bar codes with different minimum widths of dark and light elements. The reader includes a lens that forms an image of a portion of a bar code onto a detector assembly which includes a photocell. The photocell output is delivered to a detection circuit that detects the passage of images of light and dark elements across the photodetector. In one arrangement, the detector assembly defines a plurality of photocell devices have photosensitive regions of different areas, and a switch assembly connects a selected one of the photocell devices to the detector circuit. The detector assembly can include several independent cells (52-58, FIG. 4) of different diameters, with one at a time connected to the detection circuit. The detector assembly can instead include several closely adjacent photocells (82-88, FIG. 5), with selected groups connected in parallel to the detection circuit. In another arrangement, a mask is provided, with holes (142-148, FIG. 7) of different diameters, and the mask can be moved so a selected one of the holes lies in front of a large photocell. In another arrangement, a zoom lens (112, FIG. 6) varies the magnification of the bar code image formed on a photocell. In another arrangement, a camera-type iris (162, FIG. 9) lies over a photocell.
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Freilich Arthur
Hornbaker Robert D.
Levy Stuart S.
RJS, Inc.
Rosen Leon D.
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