| 摘要 |
PROBLEM TO BE SOLVED: To provide a power source circuit for an encoder for preventing occurrence of an error of rotary data due to an erroneous operation of a light receiving element at the time of reclosing a main power source. SOLUTION: The power source circuit for an encoder comprises a constant- voltage power source 12 provided between a main power source 1 and a battery 2, light receiving element 7. In this case, a constant voltage 12a is always supplied from the power source 12 to the element 7. Thus, even if the power source 1 is again turned on at the time of backing up by the battery, output of erroneous data from the element 78 can be prevented by applying the voltage 12a from the power source 12. |
