of the protruding shaft 66 the push rod 50 moves the hook 56 by a small angle via touching the edge of the second end of the hook 56 the third end of the hook 56 will rotate and depart form the positioning shaft 54 because the third end of the hook 56 is has departed away from the positioning shaft 54 and thus no longer locked onto the positioning shaft 54 the tray module 38 is pushed by the extension spring 58 out of the housing 15 25 mm please refer to fig9 fig1 and fig1 fig1 is a location diagram of some components of the tray module 38 of the optical disc drive 30 when the tray module 38 is withdrawn completely into the tray out location when the tray module 38 is pushed within the housing 32 from the tray out location the solenoid is not supplied with power and the magnet 76 of the solenoid 46 attracts the latch 48 thereby fixing the push rod 50 when the tray module 38 is pushed in a distance the protruding part 68 of the external sliding part 60 in the elastic device 52 touches the extended part 67 of the track 34 to prevent the external sliding part 60 from sliding.