| 摘要 |
<p>PURPOSE: To easily read bar codes having various densities by operation angles in a wide range. CONSTITUTION: Light emitting elements 61 and 62, a photodetection element 63, and a related circuit network are so arranged that two data channels are obtained from a scanned bar code. Two channels have different resolutions. Data of two channels are analyzed to obtain one decoded result. Though the operation angle and the density of the bar code are changed, at least one of two channels having different resolutions must be suitable for detection of the whole or most of bar code data. Data of the channel which generates the correct result can be used as it is. Even if two channels don't generate correct results by themselves, data of each channel is analyzed, and correct parts of their data are combined to generate one correct decoded result.</p> |
