| 摘要 |
PURPOSE: A disk position sensing structure is provided to reduce the sensing time and the driving number of a driving unit. CONSTITUTION: The disk position sensing structure senses a disk without making a drive unit rise/fall, by sensing the disk, safely installed in a seat(38) on a roulette(30) by means of a structure to sense angle of rotation of the roulette. The disk position sensing structure includes first identification units(33, 34, 35) each having one or more piercing order-sensing holes formed on sides of disk seats of the roulette, second identification units(36) each having a predetermined number of piercing stop holes and placed at a predetermined distance from a corresponding first identification unit, a light-emitting unit(40) for emitting rays of light to the holes of first and second identification units, and a light sensor(42) for sensing the light rays transmitted through the holes in a pulse form. Angle of rotation of the roulette and the reproducing position of the disk are determined by sensing the light rays transmitted through the holes, thereby reducing the sensing time and the driving number of the driving unit
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