Patent ID: 7639572
Filing Date: 2009-12-29
Classification: G11B

Abstract:
1. A playback apparatus capable of reading information recorded on a disc record medium, said playback apparatus having a disc tray on which a disc record medium is placed, a loading motor that ejects a disc record medium to a predefined position outside the playback apparatus and retracts a disc record medium into a predefined position inside the playback apparatus, a driver circuit capable of generating a first voltage to turn the loading motor in the direction of retracting the disc tray and a second voltage to turn the loading motor in the direction of ejecting the disc tray, and a control Integrated Circuit (IC) that control the driver circuit, the playback apparatus comprising: said control IC has an Analog to Digital (A/D) input port that receives the terminal voltage of the loading motor after voltage reduction in a predefined ratio by dividing resistors, so that, when the disc tray is in completely ejected state, said control IC acquires the voltage applied to the A/D input port at predefined time intervals and compares the acquired voltage with the predefined threshold value, and said control IC clears the count if the acquired voltage is lower than the threshold value and said control IC increments the count if the acquired voltage is larger than the predefined threshold value, and then said control IC judges whether or not the count is larger than the predefined number of times, and said control IC outputs control signals to the driver circuit if the count is larger than the predefined number of times, thereby supplying the first voltage to the loading motor and causing the loading motor to retract the disc tray into the playback apparatus.