Registers – Coded record sensors – Particular sensor structure
Patent
1995-10-05
1997-01-28
Hajec, Donald T.
Registers
Coded record sensors
Particular sensor structure
235462, G06K 710
Patent
active
055979971
ABSTRACT:
To accurately read optical information more than an opening diameter of a read opening without the read opening contacted with a reading object, in a reader for reading a bar code by irradiating light from a light source to a bar-code label, converging the reflected light through a mirror and a stop by a lens and focusing the converged light on a line image sensor with a shutter, a wavelength detector for detecting a wavelength of the reflected light and a light guide for irradiating light spots indicative of a readable range to the label are provided. Whether a reading state is in a contact reading state in which a read opening contacts the label or in a noncontact reading state in which the read opening separates from the label is determined based on a wavelength of the reflected light detected by the wavelength detector. A light emission quantity and a shutter speed are controlled so as to keep an incident light quantity to the image sensor at an optimum value on a basis of the decided result and reflected light intensity obtained by integrating a line sensor output.
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Kitazumi Yosimi
Nojiri Tadao
Obata Kenzo
Teramae Kouji
Watanabe Takeshi
Hajec Donald T.
Le Thien Minh
Nippondenso Co. Ltd.
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