Target finder in electro-optical scanners
AssigneeSymbol Technologies, Inc.
InventorsJerome Swartz, Howard M. Shepard, Eric F. Barkan, Mark J. Krichever, Boris Metlitsky, Edward Barkan, Alexander M. Adelson
Life of this patent
Estimating the term…
Abstract
A target bearing a coded indicium is found by a system for electro-optically reading indicia. Upon the determination that the indicium is located within a range of working distances relative to a hand-held housing, a user is prompted that the indicium is ready to be read. A sonic signal is transmitted by a ranger, and a return echo from the indicium is received. An auditory prompt, such as a single tone or a series of tones, advises the user that the indicium is within range.
Claims13
In a system for electro-optically reading indicia having parts of different light reflectivity, a scanning head comprising:
- a) a hand-held housing movable and aimable by a user relative to a target having an indicium to be read;
- b) a light source supported by the housing, for directing a light beam away from the housing toward the target for reflection from the indicium;
- c) a sensor supported by the housing, for detecting light of variable intensity reflected off the parts of the indicium over a field of view, and for generating an electric signal indicative of the indicium;
- d) means for scanning at least one of said light beam and said field of view;
- and
- e) means for finding the target, and for prompting the user that the housing is positioned relative to the target so that the indicium is ready to be scanned and read.
In a system for electro-optically reading indicia having parts of different light reflectivity, a scanning head comprising:
- a) a hand-held housing movable and aimable by a user relative to a target having an indicium to be read;
- b) a light source supported by the housing, for directing a light beam away from the housing toward the target for reflection from the indicium;
- c) a sensor supported by the housing, for detecting light of variable intensity reflected off the parts of the indicium over a field of view, and for generating an electric signal indicative of the indicium;
- d) means for scanning only said field of view;
- and
- e) means for finding the target, and for prompting the user that the housing is positioned relative to the target so that the indicium is ready to be scanned and read.
In a system for electro-optically reading indicia having parts of different light reflectivity, a scanning head comprising:
- a) a hand-held housing movable and aimable by a user relative to a target having an indicium to be read;
- b) a laser light source mounted in the housing, for directing a laser beam away from the housing toward the target over a field of view for reflection from the indicium;
- c) means for scanning only said field of view;
- and
- d) a sensor mounted in the housing, for detecting laser light of variable intensity reflected off the parts of the indicium over the scanned field of view, and for generating an electric signal indicative of the indicium.
Dependencies are inferred from the claim text.