Abstract: The present invention provides a device and method of polynomial power control for optical drives, which is capable of controlling the laser power discharged from the optical pickup head basing on a quadratic curve fitted on a profile of constant linear velocity values and laser powers of optical pickup head. In addition, the present invention can prevent the burning failure caused by the track width of DVD disc is narrower than that of VCD disc.

Abstract: The present invention discloses a mixed mode circuit for data slice with auto calibration and method thereof, which comprises a data slicer for converting an analog signal into a digital signal; a set of current pump for supplying a variable power supply; a microprocessor for controlling and adjusting the set of current pump; a digital sum value counter for performing an addition or a subtraction operation according to the result outputted by the data slicer; a digital signal processor for reading the internal values of the digital sum value counter and calculating the average of these internal values to obtain a parameter value. With the aforementioned structure, the invention integrates the mixed mode data slicer of analog and digital circuits so as to adopt the merits and eliminate the drawbacks of the pure analog and digital data slicer and thus achieves the objective of reading data from an optical disk better and more accurately.

Abstract: A hybrid switching method of spindle motor of optical disc drive analyze a disc position status for write/read in said optical disc drive, according said optical disc drive speed to detect a switch mode, and determine said optical disc drive of write/read mode to got a switch point.

Abstract: The present invention is smart burn method for optical drives. When the laser pick-up head bears great oscillations along the vertical and horizontal directions, the laser light cannot focus on the track accurately that causes the failure of writing. The present invention proposes a re-link method employing a technique of controlling focus error signal, tracking error signal, or both, and capable of automatically reducing the writing speed of an optical drive while detecting an occurrence of a preset burn-error parameter is being exceeded, such that a stable and good writing quality can be achieved.

Abstract: An adaptive level-cutting method of a radio frequency ripple signal for a CD-ROM drive is proposed. A digital signal processor is added to accomplish adaptive cutting of the central level of the radio frequency ripple signal for generating an accurate radio frequency zero cross signal, thereby accomplishing tracking control, short seeking control and long seeking control of an optical disc when regions with data and regions without data of the optical disc are staggered.

Abstract: The present invention discloses a method for generating a write pulse in an optical disk drives, which comprises the steps of: determining an encoded signal; providing a lookup table that integrates a plurality of various types of parameters used for a write pulse signal in different numbers of cycles for encoding and decoding signals; determining the parameters used for the write pulse signal by checking with the lookup table according to the number of cycle corresponding to the encoded signal; and forming the write pulse signal corresponding to the encoded signal according to the parameters obtained from the lookup table. With this invention, an optical disk burner can produce the write pulse with different waveforms to comply with the duplication requirements for various optical disks.

Abstract: A fully automatic control method of a spindle motor of an optical disc drive detects a firmware value stored in the optical disc drive; sets a fully automatic control mode of the spindle motor of the optical disc drive; receives a signal of the spindle motor of the optical disc drive or a reflected signal of an optical disc; and automatically switches a read mode and the speed of the spindle motor of the optical disc drive according to the received signal.

Abstract: A hybrid switching method of spindle motor of optical disc drive analyze a disc position status for write/read in said optical disc drive, according said optical disc drive speed to detect a switch mode, and determine said optical disc drive of write/read mode to got a switch point.

Abstract: The present invention discloses a mixed mode circuit for data slice with auto calibration and method thereof, which comprises a data slicer for converting an analog signal into a digital signal; a set of current pump for supplying a variable power supply; a microprocessor for controlling and adjusting the set of current pump; a digital sum value counter for performing an addition or a subtraction operation according to the result outputted by the data slicer; a digital signal processor for reading the internal values of the digital sum value counter and calculating the average of these internal values to obtain a parameter value. With the aforementioned structure, the invention integrates the mixed mode data slicer of analog and digital circuits so as to adopt the merits and eliminate the drawbacks of the pure analog and digital data slicer and thus achieves the objective of reading data from an optical disk better and more accurately.

Abstract: The present invention is smart burn method for optical drives. When the laser pick-up head bears great oscillations along the vertical and horizontal directions, the laser light cannot focus on the track accurately that causes the failure of writing. The present invention proposes a re-link method employing a technique of controlling focus error signal, tracking error signal, or both, and capable of automatically reducing the writing speed of an optical drive while detecting an occurrence of a preset burn-error parameter is being exceeded, such that a stable and good writing quality can be achieved.

Abstract: The present invention discloses a method and apparatus for detecting a run-out disc in an optical disk drive, wherein the amplitude level of a center error signal or a frequency of half-track signal per unit time is used as the basis for the detection. Unlike the prior art of using the tracking error signal as basis for the detection, it is easier for the invention to detect the run-out, and the half-track signal is not troubled by the noises on the trigger source which is suffered by tracking error signal, and thus preventing a misjudgment of run-out.

Abstract: A control system and method for controlling a sled of an optical storage device by using a stepping motor. The optical storage device includes a pick-up head having a lens and a sled. The control system includes a tracking actuator's controller used to receive a tracking signal TE for generating a tracking control signal TRO to control positions of the lens; a numerical controller connected with the tracking actuator's controller used to receive the tracking control signal TRO for generating a numerical control signal; a frequency converter connected with the numerical controller used to receive the numerical control signal for generating a pulse flag signal and a direction flag signal; and a ring generator connected with the frequency converter used to receive the pulse and direction flag signal for producing a sled control signal to drive the stepping motor for controlling the sled.

Abstract: A control system and method for controlling a sled of an optical storage device by using a stepping motor. The optical storage device includes a pick-up head having a lens and a sled. The control system includes a tracking actuator's controller used to receive a tracking signal TE for generating a tracking control signal TRO to control positions of the lens; a numerical controller connected with the tracking actuator's controller used to receive the tracking control signal TRO for generating a numerical control signal; a frequency converter connected with the numerical controller used to receive the numerical control signal for generating a pulse flag signal and a direction flag signal; and a ring generator connected with the frequency converter used to receive the pulse and direction flag signal for producing a sled control signal to drive the stepping motor for controlling the sled.