Abstract: A method for arranging conducting lines of a flexible cable in an optical disk drive first confirms the pins having similar functions of all chips on a main board and a sub-board, and uses only one conducting line of the flexible cable to connect these pins. Therefore, the number of the conducting lines of the flexible cable can be reduced.

Abstract: In an optical reading apparatus, a light source, a high frequency modulator IC and a first resistor are integrated in an optical pickup unit, wherein the light source emits a light beam onto the optical storage medium in order to read information from the optical storage medium, the high frequency modulator generates a high frequency modulating signal for adjusting the intensity of the light beam, and the first resistor has a first end coupled to ground and a second end couple to a first pin of the high frequency modulator IC. A voltage control module disposed outside the optical pickup unit and coupled to the first resistor in parallel is used for adjusting an output current of the first pin in response to a voltage change thereof, thereby adjusting the amplitude of the high frequency modulating signal.

Abstract: A DVD recognition method and apparatus is disclosed. First, a disc recognition apparatus uses a laser with a specific wavelength to irradiate an inner area of the DVD, thereby obtaining an inner TE signal. Then, the disc recognition apparatus uses the laser to irradiate an outer area of the DVD, thereby obtaining an outer TE signal. Afterward, the type of the DVD is recognized according to the inner and outer TE signals.

Abstract: A method for correcting disc type determination is disclosed. The method detects a tracking error signal, and verifies accuracy of a disc type determination according thereto.

Abstract: An optical disk drive for compensating wobble signal and the method thereof. The compensating method is used in an optical pick-up head and a servo controller. The optical pick-up head includes a laser diode and a photo detectors. Firstly, the laser diode emits a beam focused on an optical disc to generate a reflective beam. Next, the photo detector receives the reflective beam to generate plural photo detecting signals. A servo controller receives the photo detecting signals to generate a processed signal. The objective lens is moved according to the processed signal. The photo detector receives the reflective beam to generate the photo detecting signals until the absolute value of the processed signal is not larger than a fixed value, then the photo detector receives the reflective beam to generate plural calibrated photo detecting signals. Lastly, a wobble signal is generated according to the calibrated photo detecting signals.

Abstract: An optical disk drive for compensating wobble signal and the method thereof. The compensating method is used in a servo controller and an optical pick-up head. The optical pick-up head includes a laser diode, a photo detector and an objective lens. The servo controller includes an auto gain controller. Firstly, a beam is emitted by the laser diode emits and is focused on an optical disc to generate a reflective beam. Next, the photo detector receives the reflective beam to generate plural photo-detecting signals received by the auto gain controller to generate a first control signal and a second control signal. Then, the servo controller generates a third control signal according to the first and the second control signals. The objective lens is moved according to the third control signal. Lastly, the photo detector receives the reflective beam to generate plural calibrated photo-detecting signals whereby a wobble signal is generated.

Abstract: The present invention discloses a focus control method for locating a focus point on the reflecting layer of an optical disc, particularly a blank disc without data therein. Under a primary focus condition that the focus point is close to the reflecting layer, N offset voltages are sequentially superposed onto a focus error signal to result in N corresponding counting values of a wobble signal. Select a specific offset voltage that results in the greatest counting value of the wobble signal and superpose the specific offset voltage onto the focus error signal and following focus error signals for further focus control.

Abstract: A method and an apparatus of adjusting the tilt-angle of the lens in the optical pick-up head. The apparatus includes a position detecting unit for detecting a position deviation of the lens against the sled, a parameter generating unit for generating a tilt control parameter according to the position deviation, and a tilt control unit for controlling the lens according to the tilt control parameter so that the lens maintains horizontal with reference to the sled.

Abstract: A method for generating a gain-adjusted tracking error signal in a disc reading apparatus includes the following steps. Firstly, a disc having been defined with a data region and a blank region is loaded into the disc reading apparatus. Then, a start-up procedure is executed, and a seeking operation across an interface between the data region and the blank region is performed to detect first and second voltage peaks of a first tracking error signal for the data region and the blank region, respectively. After the start-up procedure has been completed, the disc reading apparatus enters a ready-to-read state. In the ready-to-read state, a tracking operation is performed to generate a second tracking error signal and the second tracking error signal is adjusted with a first gain and a second gain for the data region and the blank region, respectively, thereby generating the gain-adjusted tracking error signal.

Abstract: A method of correcting a step number of a stepping motor in an optical drive is disclosed. After an optical disk is tray into the optical drive, a step number of the stepping motor for moving an optical pickup module by a predetermined number of tracks is firstly calculated. Then, a practical track number by which the optical pickup module is moved after the stepping motor has stepped by the step number is calculated. Thereafter, a corrective track/step ratio is obtained.

Abstract: The present invention discloses a method for controlling a pick-up head during a long seek. During a long seek, a bias voltage is applied to the pick-up head to overcome the inertia of the pick-up head and to prevent the pick-up head from oscillating. This makes it easier for the optical drive to execute the track-on action after a long seek.

Abstract: A method of on-line adjusting a sled motor control signal (FMO) is disclosed. First, a predetermined FMO is assigned to move a sled for seeking, and a photo signal is monitored. The number of waveforms appearing in the photo signal and a distance from an optical pickup to a target track are calculated under this predetermined FMO. Then, the optical pickup is moved to the target track such that the optical pickup after seeking is located at a center position of a movable range. If the number of waveforms appearing in the photo signal is not equal to a predetermined number, the duration of the FMO is adjusted according to the difference therebetween.

Abstract: A method of controlling a sled motor control signal (FMO) is disclosed. First, a predetermined FMO is assigned to move a sled, and a photo signal is monitored. The FMO is off after a predetermined number of waveforms have appeared in the photo signal. Then, a position of an optical pickup is finely adjusted such that the optical pickup is at a center position of a movable range after the seeking operation.

Abstract: A method of controlling the tracking action of an optical disk drive is disclosed. According to the method, the number of sine waves in the tracking error signals is calculated while the disk drive is conducting a long seek, to determine the number of tracks crossed by the optical pick up head. When the disk drive is about to perform tracking on action, the actual speed of the sledge is estimated by estimating the frequency of alternating high and low levels in an optical signal detected by the optical receiver. The tracking on action is carried out if the speed of the sledge is below a threshold value.

Abstract: A method for arranging conducting lines of a flexible cable in an optical disk drive first confirms the pins having similar functions of all chips on a main board and a sub-board, and uses only one conducting line of the flexible cable to connect these pins. Therefore, the number of the conducting lines of the flexible cable can be reduced.

Abstract: A method for correcting a position of an optical pickup before track following is disclosed. The actual position of the optical pickup before seeking is detected. Then, a sled motor control signal is provided to compensate for the force of the sled seeking such that the optical pickup is at a center of a movable range after seeking.

Abstract: A method for detecting an unbalanced optical disc in an optical disc drive. The unbalanced optical disc is detected by a pick-up head of the optical disc drive to obtain a tracking error signal. A first track-across number at which the pick-up head travels on the unbalanced optical disc is determined when the unbalanced optical disc rotates at a first rotational speed. A second track-across number at which the pick-up head travels on the unbalanced optical disc is determined when the unbalanced optical disc rotates at a second rotational speed. The first track-across number and second track-across number are computed to obtain a resulting value. The unbalanced level of the unbalanced optical disc is determined according to the resulting value.

Abstract: A method of disc protection during servo focusing is disclosed. First, the disc device performs a servo focusing on a disc at a first speed, and records the first focusing time accordingly. Afterward, the disc device calculates a second focusing time required for another servo focusing if the disc requires re-focusing, and re-focuses the disc if the second focusing time exceeds the first focusing time.

Abstract: After an optical disk drive is powered on, a predetermined force is provided to a sled motor. When the predetermined force is provided, a duration of the pickup head module sliding from an inner region to an outer region of an optical disk is measured. A correction coefficient is obtained from the ratio of the measured duration and an ideal duration. Thereafter the force of the sled motor is corrected by the correction coefficient. This reduces differences of reading/writing time among individual optical disk drives.

Abstract: A method of braking control in rapid track seeking for an optical drive. The optical drive has a pickup head for reading information from an optical disc therein. According to the method, a tracking error signal is obtained in the rapid track seeking motion of the pickup head. A seeking velocity is obtained by calculation according to the tracking error signal. Since the seeking velocity varies, a braking force is determined according to the seeking velocity for braking the pickup head.