Patent ID: 7333403

Claim:
A carousel changer, comprising: a turntable provided with a plurality of trays around its rotating shaft, said trays each carrying a disk thereon; a motor rotating said turntable; a rib formed annularly at said turntable, said rib including a plurality of count areas each for identifying one of said trays and a plurality of stop areas for stopping the rotation of said turntable, said stop areas alternated with said count areas, each of said count and stop areas including a plurality of recessed portions and a plurality of raised portions, said plurality of recessed portions including an internal recessed portion and a boundary recessed portion, said boundary recessed portion formed at the boundary between said count area and said stop area, said plurality of raised portions including an internal raised portion adjacent to the internal recessed portion and a boundary raised portion adjacent to the boundary recessed portion, a ratio of a width of said boundary recessed portion to a width of said boundary raised portion being different from a ratio of a width of said internal recessed portion to a width of said internal raised portion; a sensor detecting the width of said recessed portions and said raised portions; a comparator comparing the width of said recessed portion and the width of said raised portion adjacent to said recessed portion; and a controller controlling said motor based on the ratio of the width of said recessed portion to the width of said raised portion obtained by said comparator.