| 摘要 |
PROBLEM TO BE SOLVED: To provide a light quantity adjusting device capable of giving an excellent feeling of manual operation to every user and preventing a motor from being erroneously operated at the time of changing over a motor-driven mode tol from a manual mode. SOLUTION: This light quantity adjusting device, which is selectively driven in a motor-driven mode or a manual mode by a drive change-over means 2 and sets a light quantity variably, is provided with a motor driving source 3 such as a motor for transmitting driving force to a device operating part 6 when the drive change-over means 2 is switched to a motor-driven mode side, a variable load generating circuit for generating a load (reversing torque of the motor, etc.), to the manual drive of the device operating part to the driving source when the drive change-over means is switched to a manual mode side and setting the load variably, a connection change-over circuit 8 for disconnecting the variable load generating circuit from the driving source when the drive change-over means is switched to the motor-driven side and connecting the variable load generating circuit to the electric driving source when the drive change-over means is switched to the manual mode.
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