| 摘要 |
PURPOSE:To attain ease of position adjustment of a detecting member by providing the detecting member while positioning equal to two intervals to be detected and moving a body to be detected with an equal length to the said interval together with a slider. CONSTITUTION:A detector S consists of two optical detecting members S1, S2, provided along a moving path of the slider 4, positioned at an interval equal to the interval between the outermost peripheral position C and the middle position B of a disc 1 and fixed to a base 11. The detecting position is adjusted by moving the slider 4 to bring a pickup 3 to the position A and moving the base 11 to the left/right, and one end of a body X to be detected fixed to the slider 4 by the detecting member S1 and then the base 11 is fixed. Thus, at least one of three detection positions A, B, C is detected by the adjustment of position, allowing to decide other two detecting positions. |
