| 摘要 |
PROBLEM TO BE SOLVED: To reduce the load of software processing a step-out detection circuit and detect the origin by rotating a motor by 180 degrees. SOLUTION: A shading plate 16 is arranged at 0 degree position of a rotation plate 12a and a photosensor 14 is arranged on the opposite position of the shading plate 16. Also, a shading plate 17 is arranged apart from the shading plate 16 by x degree and a photosensor 15 is arranged at the opposite position of the shading plate 17. Also, a light shield plate 18 is arranged apart from the shading plate 16 by 90 degrees and a light shield plate 19 is arranged apart by 180 degrees and a light shield plate 20 is arranged apart by 270 degrees. The photosensors 14 and 15 inform the shading state by outside. By this, the position of the rotation state 12a is roughly identified from the outside by the light shield state from the photosensors 14 and 15 and an external software processing is reduced.
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