Patent ID: 7873968

Claim:
A position detecting device of an optical drive, the position detecting device comprising: a mainboard having a CPU (Central Processing Unit) for controlling the optical drive; a fixing part fixed in the optical drive; a latch part for latching or releasing the fixing part; and at least one wire for connecting the CPU to the latch part and the fixing part to form a detecting circuit; wherein when the latch part clasps or releases a tray of the optical drive, the latch part latches or releases the fixing part to close or open the detecting circuit, so that the CPU judges whether the tray enters for positioning and starts or shuts down the optical drive in order to eject the tray, under control of the CPU, the latch part is rotated such that the latch part releases the fixing part, the detection circuit is opened, such that the CPU judges that the tray is ejected and shuts down the optical drive; and when the tray is pushed into the optical drive, the latch part is moved into the optical drive, the latch part hooks the fixing part and the detecting circuit is closed such that the CPU judges that the tray enters for positioning and starts the optical drive.