| 摘要 |
PURPOSE:To make the thickness in the axial direction thin, by fixing slit disks to the end parts of a plurality of rotary shafts, so that the disks are arranged in parallel in the close proximity with each other and the slit forming parts of said slit disks are not overlapped. CONSTITUTION:A pulse encoder comprises light emitting elements 19 and 20 and light receiving elements 14 and 15, which are provided in correspondence with slit forming parts 16d and 17d of slit disks 16 and 17. The slit disks 16 and 17 are arranged in parallel in close proximity each other. The diameters of slit forming parts 16d and 17d are made different so that the slit forming parts 16d and 17d are not overlapped. An annular light transmitting part 13, which is concentric with the slit forming part 17d, is provided on the side of the axial center of at least from the slit forming part 17d of the slit disk 17, other than the slid disk 16. The disk 16 has the slit forming parts 16d, whose diameter is the smallest. Said light transmitting part 13 is provided in a light path between the light emitting element 19 and the light receiving element 14, which are provided in correspondence with the forming part 16d of the other slit disk 16. |
