| 摘要 |
PROBLEM TO BE SOLVED: To reduce the number of parts, to miniaturize, and to reduce manufacturing cost. SOLUTION: A delay timeΔt between light receiving outputs of each light receiving element 17a, 17b when a detection object 19 is moved, and a moving velocity v and a moving quantity d of the detection object 19 are determined by using the delay timeΔt. In this device 11, each one of a collimator lens 13, a beam splitter 14, an objective lens 15 and a light receiving lens 16 is provided, thereby guiding each light beam La, Lb together from each light emitting element 12a, 12b to each light receiving element 17a, 17b. Thus, reduction of the number of parts, miniaturization and reduction of the manufacturing cost are enabled. COPYRIGHT: (C)2004,JPO
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