Reader for reading machine-readable symbols, for example bar code symbols
First Claim
Patent Images
1. A device to scan machine-readable symbols, the device comprising:
- a first reflective surface having an outer perimeter; and
a second reflective surface having an outer perimeter, the outer perimeter of the second reflective surface being smaller than the outer perimeter of the first reflective surface, the outer perimeter of the second reflective surface disposed in a volume formed by a normal projection of the outer perimeter of the first reflective surface such that at least a portion of the second reflective surface is exposable to illumination simultaneously with the first reflective surface, and wherein the second reflective surface is mounted for movement about at least a first axis to produce a scanning motion.
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Abstract
A machine-readable symbol reader for reading machine-readable symbols such as barcode symbols employs a first reflective surface having a first perimeter to create a pointer beam, and a movable second reflective surface with a second perimeter small than the first perimeter to create a scanning beam. The pointer and scanner beams may exist simultaneously and may be formed from a same illumination beam.
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Citations
32 Claims
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1. A device to scan machine-readable symbols, the device comprising:
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a first reflective surface having an outer perimeter; and a second reflective surface having an outer perimeter, the outer perimeter of the second reflective surface being smaller than the outer perimeter of the first reflective surface, the outer perimeter of the second reflective surface disposed in a volume formed by a normal projection of the outer perimeter of the first reflective surface such that at least a portion of the second reflective surface is exposable to illumination simultaneously with the first reflective surface, and wherein the second reflective surface is mounted for movement about at least a first axis to produce a scanning motion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A device to scan a machine-readable symbol, the device comprising:
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pointer beam means for directing a pointer beam externally from the device; and scanner beam means for directing a scanner beam externally from the device while the pointer beam is directed externally from the device, the scanner beam scanning along at least one axis perpendicular to the direction in which the pointer beam is directed externally from the device. - View Dependent Claims (20, 21, 22, 23, 24)
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25. A method of scanning a machine-readable symbol, the method comprising:
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oscillating a scanner reflective surface having a first outer perimeter with respect to an illumination source and a fixed reflective surface having a second outer perimeter greater than the first outer perimeter, the first outer perimeter disposed in a volume formed by a normal projection of the second outer perimeter; and illuminating the scanner reflective surface and at least a portion of the fixed reflective surface exposed beyond the first outer perimeter at a same time with a same illumination beam. - View Dependent Claims (26, 27, 28)
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29. A method of manufacturing an optical system for a machine-readable symbol reader, the method comprising:
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forming a reflective surface on a substrate; and partitioning the reflective surface into a first reflective surface portion having a first outer perimeter and a second reflective surface portion having a second outer perimeter, the second outer perimeter disposed within the first outer perimeter and the second reflective surface portion moveably supported from the substrate by at least one support member. - View Dependent Claims (30, 31, 32)
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Specification