Molded code mark reader with elongated read beam

Details Molded code mark reader with elongated read beam Molded code mark reader with elongated read beam

1987-06-23

1987-12-15

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250556, 235464, G01N 904, G06K 710

Patent

active

047135360

ABSTRACT:
A mold number reader for detecting code marks at the heel of a transparent bottle or the like, such code marks desirable being in the form of dots or balls protruding from the bottle's heel. During rotation of the bottle, its heel portion is illuminated with a structured light source in the form of a narrow rectangle, which light is selectively reflected by code marks and collected by field-type optics. The use of a wall defined light source of small area provides a high input signal level, while the field optics enjoys a high depth of field an hence decreased sensitivity to bottle placement during inspection. The light source may be a modulated laser diode and the signal processing electronics may include a demodulator to process the photodetector output signal. The use of heterodyned signal processing decreases the sensitivity to ambient light and other sources of noise in the output signal.

REFERENCES:
patent: 4175236 (1979-11-01), Juvinall
patent: 4201338 (1980-05-01), Keller
patent: 4230266 (1980-10-01), Juvinall

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