Abstract: An optical disc drive and related method for accessing an optical disc. The optical disc drive includes a pickup module, a digital pre-amp module, a servo control module, and an actuator module. The pickup module generates a plurality of digital receiving signals according to a light beam reflected off the optical disc. Coupled to the pickup module, the digital pre-amp module generates a digital servo control signal according to the plurality of digital receiving signals. Coupled to the digital pre-amp module, the servo control module generates a driving signal according to the digital servo control signal. Coupled to the servo control module, the actuator module controls a position of a focal point of a laser light generated by the pickup module according to the driving signal.

Abstract: A method of controlling an optical drive to perform a braking process in a layer jump process. The optical drive has a vertically movable pickup head, a preamplifier, a controller, and a low pass filter. The controller receives a focus error signal produced by the preamplifier to produce a focus control signal, and sends the focus control signal to the low pass filter to produce a layer distance balancing signal, so that the pickup head is controlled by the layer distance balancing signal to perform the layer jump process. The method of the present invention comprises the steps of: performing the braking process in accordance with a braking signal and the layer distance balancing signal when the focus error signal reaches a braking start point; and performing a closed-loop focusing control process when the focus error signal reaches a closed-loop focusing control point.

Abstract: A method of controlling an optical drive to perform a braking process in a layer jump process. The optical drive has a vertically movable pickup head, a preamplifier, a controller, and a low pass filter. The controller receives a focus error signal produced by the preamplifier to produce a focus control signal, and sends the focus control signal to the low pass filter to produce a layer distance balancing signal, so that the pickup head is controlled by the layer distance balancing signal to perform the layer jump process. The method of the present invention comprises the steps of: performing the braking process in accordance with a braking signal and the layer distance balancing signal when the focus error signal reaches a braking start point; and performing a closed-loop focusing control process when the focus error signal reaches a closed-loop focusing control point.

Abstract: A device is designed to prevent a car theft and is provided with a remote controller for activating or deactivating the device. The device comprises a control unit, one or more oil pressure jacks, one or more oil pressure driving apparatus, and a plurality of sensors capable of transmitting a triggering signal to the control unit at such time when the car body is exerted on by external forces. As the control unit is triggered, the oil pressure driving apparatus are actuated to drive the oil pressure jacks to hoist the car body, thereby preventing the car from being driven away by an unauthorized person.