Registers – Coded record sensors – Particular sensor structure
Patent
1993-05-10
1995-09-12
Shepperd, John
Registers
Coded record sensors
Particular sensor structure
2502221, G06K 710, G01V 904
Patent
active
054498910
ABSTRACT:
An optical scanning method for reading indicia of a type having regions of different light reflectivity, the method comprising the steps of providing a scanning unit having a field of view in which indicia may be read; providing an object sensor directed at a location within or nearby the field of view of the scanning unit; supporting the scanning unit and object sensor on a movable structure; moving the scanning unit and object sensor in unison with the structure; and electrically connecting the object sensor and scanning unit, including the steps of differentiating an output of the object sensor to provide an electrical signal representative of the degree of change in the amount of reflected light, and activating the scanning unit when there is more than a predetermined change in the differentiated signal, whether that change is from an increase or decrease in the amount of reflected light; wherein when an object that is more or less reflective than the background enters the field of view the scanning unit is activated, causing it to attempt to read indicia on the object.
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Metrologic Model MS700 Projection Scanner, brochure May, 1990.
SL6700 Visible Laser Diode Scanlamp, ST2000 SMart Stands, Symbolstand Series, Symbol Technologies Catalog, pp. 19-19 (no date given).
Shepperd John
Symbol Technologies Inc.
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