发明名称 |
Optical information reader |
摘要 |
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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申请公布号 |
US5597997(A) |
申请公布日期 |
1997.01.28 |
申请号 |
US19950540239 |
申请日期 |
1995.10.05 |
申请人 |
NIPPONDENSO CO., LTD. |
发明人 |
OBATA, KENZO;KITAZUMI, YOSIMI;WATANABE, TAKESHI;TERAMAE, KOUJI;NOJIRI, TADAO |
分类号 |
G06K7/10;(IPC1-7):G06K7/10 |
主分类号 |
G06K7/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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