| 摘要 |
PROBLEM TO BE SOLVED: To reduce the noises of position detection signals outputted from an optical encoder. SOLUTION: The optical encoder integrated circuit is equipped with a signal processor producing the position detecting signals from detection signals outputted from a photodetector, a belt-like power supply layer 32a which is formed, at least, between the signal processor and the photodetector and pulled up to a power supply potential, and conductor layers 36 and 38 which are formed above the power supply potential layer 32a and provided at different levels. A connecting line 34 which crosses above the power supply potential layer 32a to electrically connect the photodetector and the signal processor together is formed of the conductor layer 38 out of the conductor layers 36 and 38 other than the lowest conductor layer 36 in a region 54 just over the power supply potential layer 32a. The power supply potential layer 32a is separated from the connecting line 34 to restrain power supply noises from mixing with the position detecting signals. COPYRIGHT: (C)2004,JPO&NCIPI
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