摘要:
A miniaturized electro-optical, retro-reflective scanning module. The module has a base, a first circuit board, and a second circuit board mounted substantially orthogonal to the first circuit board. The base supports a light emitter for producing a scanning beam and optical elements for directing and collecting light energy. The emitted beam reflects off a fold mirror onto a reflector mounted on a drive for oscillation. The oscillating reflector, in turn, redirects the beam onto an indicia being read. The reflected light is reflected off the oscillating reflector and directed to the collection mirror before reaching a detector. The detector included in the module senses light reflected from an indicia scanned by the beam. The reflector is driven by an electro-magnetiz driven system, including a flexure and an actuation arm.
摘要:
An electro-optical, retroreflective scanning module has a base, a first circuit board, and a second circuit board mounted orthogonal to the first circuit board. The base supports a light emitter for producing a scanning beam. The beam reflects off a generally planar scan mirror affixed to a stationary concave collection mirror, to a reflector mounted on a drive for oscillation. A detector included in the module senses light reflected from an indicia scanned by the beam. The reflected light is reflected off the reflector and directed to the collection mirror before reaching the detector. The beam and the field of view of the detector are simultaneously scanned.
摘要:
An optical scanner for reading indicia having areas of different light reflectivity, such as bar code symbols includes a stationary, multi-surface, fold mirror having a first surface of a first aplanar profile and a second surface of a second, different aplanar profile.
摘要:
An optical scanner such as a bar code scanner includes a laser diode to create the scanning laser beam. Laser diodes are characteristically astigmatic, and when passed through a rotationally symmetric lens the beam typically forms a waist both in the x (scanning) direction and in the y (perpendicular) direction. The width of the beam envelope in the x direction is adjusted by means of a conventional lens. The width of the beam envelope in the y direction is adjusted by the use of a non-planar mirror, preferably a cylindrical mirror, as the rotating or oscillating element.
摘要:
An optical bar code scanner and method which achieves an extended depth of focus by employing a multifocal length collection optical system. A radiation beam is generated for illuminating a field of view, either by a laser or nonlaser source. The embodiments specifically disclosed herein employ nonlaser sources such as LEDs. The multifocal length collection optical system consisting of a plurality of lenses or mirrors having at least a near range focal length and a long range focal length, simultaneously collects radiation reflected from objects in the field of view, and directs it to an optical detector for detection and generation of an electrical output signal indicative thereof. The electrical output signal of the detector is then passed through a high pass filter which filters out a DC background electrical signal, thereby improving the depth of modulation of the signal.
摘要:
The scan pattern, scan direction of at least one scan line, the intensity of a light beam, and the scan rate are individually or collectively changeable in a scanner for reading bar code symbols.
摘要:
Multiple scan line pattern generators including bidirectional scan patterns of mutually parallel scan lines, and scan patterns composed of intersecting lines, are superimposed over bar code symbols to be read. At least one of the scan lines is automatically moved closer to and further away from a reader to perform a zooming function to read far-out and close-in symbols.
摘要:
A bar code reader and method of reading a bar code symbol successively generates scan patterns at different times on the symbol. Preferably, two light sources are alternately energized to alternately produce two scan lines across the symbol. Each scan line reflects light from the symbol. The reflected light is detected by a photodetector which, in turn, generates an electrical signal. This signal is decoded into data corresponding to the symbol.
摘要:
An optical scanner such as a bar code scanner includes a segmented fold mirror, the individual sections of which have different profiles. By directing the scanning laser beam across the fold mirror, a plurality of scan lines are created, at different distances from the scanner. This provides increased flexibility by extending the scanner's working range. In alternative embodiments, a collector mirror and/or a scanning mirror may be segmented. In addition, beam shaping may be provided by reflecting the beam from one or more aplanar surfaces.
摘要:
Electrical power consumption is saved in a low-cost scanner for reading bar code symbols by oscillating one of the scanner components either by mechanical power alone or by a low-power electrical drive.