| 摘要 |
<p>PROBLEM TO BE SOLVED: To allow to change the torque of a return spring of a photo coupler with a movable contact piece. SOLUTION: In the photo coupler device 21, the movable contact piece 27 swings and displaces in contact with an object 31 under detection, and receives a return torque from the return spring 32. One end of the return spring 32 is coupled with a case 23, the other end of the return spring 32 is coupled with one of a plurality of return spring fixing holes 33, 34, 35 provided on the movable contact piece 27, and the torque can be changed by changing and selecting the positions of the return spring fixing holes 33, 34, 35.</p> |
