Registers – Coded record sensors – Particular sensor structure
Patent
1990-09-13
1993-08-03
LaRoche, Eugene R.
Registers
Coded record sensors
Particular sensor structure
235470, 318139, G06K 710, H02P 100
Patent
active
052331717
ABSTRACT:
A optical reader for scanning optical marks from a substrate. The reader employs a novel optical geometry to eliminate undesirable specular reflections from entering the optical detection system. A stage area is provided for receiving the substrate, the stage having a window through which an incident beam of light passes at an oblique angle with respect to the window. A retrocollection system is used to return reflections from the substrate to the optical assembly. By directing the beam at an oblique angle with respect to the window, specular reflections are not collected in the retrocollection system and thus are not received by the optical detection system. The invention also utilizes a permanent magnet, direct current motor for controlling a scanning mirror, and further has a motor control circuit for preventing the introduction of electrical noise from the motor during the scan. A sensor may be provided to detect the presence of the card on the stage and provide "on demand" scanning.
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Glembocki Christopher R.
Griswold Gary L.
Kirn Walter N.
LaRoche Eugene R.
Minnesota Mining and Manufacturing Company
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