Abstract: An optical disc identification apparatus is disclosed. The optical disc identification apparatus includes an optic pickup unit and a control unit. The optic pickup unit has a plurality of laser sources. The optic pickup unit emits any of lasers to the optical disc and detects the reflected laser from the optical disc to transduce the reflected laser to a detection signal. The control unit controls the optic pickup unit to activate any of the laser sources and moves an object lens of the optic pickup unit. When the object lens moves, the control unit obtains a sectional width value of an S-curve of a focus FE signal according to the detection signal. The control unit repeats above steps to obtain the sectional width values of the S-curves of all the laser sources and identifies the optical disc according to all the sectional width values.

Abstract: A method for automatically calibrating an output power of an optical pick-up head is provided. First, an optical disc is provided, wherein a relationship between the output power for writing the optical disc and a specific parameter corresponding thereto is defined as a first function. Next, the optical pick-up head is controlled to perform a writing operation on the optical disc according to an instruction value, and obtain the specific parameter corresponding to the instruction value. Next, the output power corresponding to the instruction value is obtained according to the first function and the specific parameter. Next, the instruction value is adjusted according to the instruction value and the output power, and the output power of the optical pick-up head is calibrated according to the adjusted instruction value.

Abstract: A brake system and method for a direct current brushed motor without a Hall sensor are provided. After the system is activated, the motor is pre-braked in order to detect and record the stationary armature current while the motor is in a stationary state. As the motor is required to be braked, a reverse control voltage is generated and then the armature current value is detected. When the detected armature current value is equal to the stationary armature current value, the operation of braking the DC brush motor is accomplished. The invention can achieve the goal of braking the motor to a stop quickly, no matter which state the motor is in. Besides, it can be applied to different kinds of motors.

Abstract: The present invention provides a method for adaptively driving a tracking element with mechanical deviation and a driving device using the same. The method comprises the following steps: recording standard moving time and a standard motor current value, supplying driving voltage to a motor for driving a tracking element, detecting a current value of the motor and detecting moving time of the tracking element, and adjusting a driving gain of the motor based on the relation between the current value of the motor and the standard motor current value, and based on the relation between the moving time of the tracking element and the standard moving time of the standard one.