Abstract: A method for controlling layer changes for an optical disk drive is provided, where a focus of a laserbeam emitted by a pickup head of the optical disk drive is moved from a current data layer of a disk to a target data layer of the disk. First, a position of a collimator lens of the pickup head is adjusted for spherical aberration correction. The objective lens is then lowered to a low position to move the focus of the laserbeam off the surface of the disk. The objective lens is then raised towards the disk. A focusing error signal is generated while the objective lens is being raised. Whether a target S-curve corresponding to the target data layer is present in the focusing error signal is then started to be detected. If the target S-curve is detected, the focus on operation on the target data layer of the disk is successful.

Abstract: A method of identifying physical characteristic information of an optical disc includes: deriving a reading result by reading at least a first region of the optical disc, where a location of the first region is specified in a Blu-ray disc specification for recording information associated with recording management of a BD recordable disc; and identifying a first physical characteristic of the optical disc according to the reading result.

Abstract: A method for performing a servo defect compensating operation by compensating a servo-related signal in an optical disc drive and a related optical disc drive system with a DSP is provided. The method comprises: reading an optical medium by an optical pick-up unit; detecting whether a defect exists by monitoring a side beam signal; when the defect on the optical medium is detected, determining a new compensation value based on a servo error signal; and compensating the servo-related signal with the new compensation value during defect crossing to adjust servo control when the optical pick-up unit passes the defect.

Abstract: A method of identifying physical characteristic information of an optical disc includes: deriving a reading result by reading at least a first region of the optical disc, where a location of the first region is specified in a Blu-ray disc specification for recording information associated with recording management of a BD recordable disc; and identifying a first physical characteristic of the optical disc according to the reading result.

Abstract: A method for controlling layer changes for an optical disk drive is provided, where a focus of a laserbeam emitted by a pickup head of the optical disk drive is moved from a current data layer of a disk to a target data layer of the disk. First, a position of a collimator lens of the pickup head is adjusted for spherical aberration correction. The objective lens is then lowered to a low position to move the focus of the laserbeam off the surface of the disk. The objective lens is then raised towards the disk. A focusing error signal is generated while the objective lens is being raised. Whether a target S-curve corresponding to the target data layer is present in the focusing error signal is then started to be detected. If the target S-curve is detected, the focus on operation on the target data layer of the disk is successful.

Abstract: A method for performing a servo defect compensating operation by compensating a servo-related signal in an optical disc drive and a related optical disc drive system with a DSP is provided. The method comprises: reading an optical medium by an optical pick-up unit; detecting whether a defect exists by monitoring a side beam signal; when the defect on the optical medium is detected, determining a new compensation value based on a servo error signal; and compensating the servo-related signal with the new compensation value during defect crossing to adjust servo control when the optical pick-up unit passes the defect.

Abstract: The present invention discloses an optical disc apparatus. The optical disc apparatus includes a rotation module for rotating a plurality of optical discs; a plurality of holding plates, which at least includes a first holding plate and a second holding plate, for loading the optical discs; a sled guide bar positioned between the first holding plate and second holding plate on a straight line; an optical pick-up unit for accessing the optical discs; and a sled motor, moveably positioned of sled on the sled guide bar, for loading the optical pick-up unit and driving the optical pick-up unit along the sled guide bar to access each of the optical discs loaded on the holding plates.

Abstract: A light emitting device calibration system includes a device under test including a light emitting device to be calibrated and a microprocessor electrically coupled to the light emitting device. A light detector is coupled to the device under test. During a calibration mode, the microprocessor controls power of the light emitting device by changing values of a drive signal to the light emitting device, receives a power indication corresponding to light emitted by the light emitting device, and determines a power relationship relating values of the drive signal to powers of the light emitting device according to a power indication for each of a plurality of values of the drive signal. The light detector coupled to the device under test detects the light emitted by the light emitting device to generate the power indication corresponding to the light emitted by the light emitting device.

Abstract: A recording system is provided, improving laser control when writing data on an optical recording medium. A data buffer stores data to be recorded, wherein the data is divided into first and second data units in response to a trigger signal, wherein the first data unit is followed by the second data unit. A laser controller first receives the second data unit from the data buffer, writes the second data unit to an optical disc using a write laser, reads and evaluates the recorded second data unit, adjusts characteristics of the write laser according to the evaluation, receives the first data unit from the data buffer, and writes the first data unit to the optical disc using the adjusted write laser.

Abstract: A method of automatic light emitting device calibration includes providing an optical device having a light emitting device and a photo monitor; controlling power of the light emitting device by changing values of a drive signal to the light emitting device; detecting light emitted by the light emitting device and generating a monitor signal having a value corresponding to the light emitted by the light emitting device utilizing the photo monitor; and determining a preliminary power relationship relating values of the drive signal to powers of the light emitting device according to received monitor signal values for a plurality of drive signal values and a predetermined conversion rule for converting the received monitor signal values to corresponding powers of the light emitting device. A final power relationship is generated by performing a power relationship correction operation to ensure test data is written to an optical medium at a particular power.

Abstract: A light emitting device calibration system includes a device under test including a light emitting device to be calibrated and a microprocessor electrically coupled to the light emitting device. A light detector is coupled to the device under test. During a calibration mode, the microprocessor controls power of the light emitting device by changing values of a drive signal to the light emitting device, receives a power indication corresponding to light emitted by the light emitting device, and determines a power relationship relating values of the drive signal to powers of the light emitting device according to a power indication for each of a plurality of values of the drive signal. The light detector coupled to the device under test detects the light emitted by the light emitting device to generate the power indication corresponding to the light emitted by the light emitting device.