Abstract: The present invention discloses a circuit board fixing device for fixing a circuit board. The device comprises a chassis for supporting the circuit board, at least one first hook setting on the supporting surface, and at least one second hook setting on the supporting surface. The first hook has a first contact surface for clamping a first type circuit board on the supporting surface. A first distance is between the first contact surface and the supporting surface. Additionally, the second hook has a second contact surface for clamping a second type circuit board on the supporting surface. A second distance is between the second contact surface and the supporting surface. The thickness of the first type circuit board is thicker than that of the second type circuit board, and the first distance is larger than the second distance.

Abstract: A slot-in optical disc drive is provided to comprise a driving element moveably disposed in the optical disc and capable of moving toward a disc loading direction and a disc unloading direction, wherein the driving element has a loading drive groove; a disc loading element pivoted in the optical disc drive, wherein the disc loading element has a loading driven pin for operating with the loading drive groove; a disc unloading element pivoted in the optical disc drive; and an elastic element used for providing an elastic force on the disc unloading element. When the driving element moves toward the disc unloading direction, the loading driven pin relatively moves in the loading drive groove and drives the disc loading element to rotate and push a disc into the optical disc drive. When the driving element moves toward the disc loading direction, the elastic force provided from the elastic element drives the disc unloading element to rotate and push the disc out of the optical disc.

Abstract: The present invention discloses a multimedia storage device comprising a cartridge and a loader. The cartridge connects to media devices of different formats, and the loader comprises a loading/ejecting device and connects to an external application device. The cartridge is loaded into and ejected out of the loader by the loading/ejecting device. When the cartridge is loaded into the loader, the external application device can play and access the files stored in media device.

Abstract: An electronic apparatus includes a first power source input terminal configured to receive a first driving voltage or a second driving voltage, wherein the second driving voltage is greater than the first driving voltage; a second power source input terminal configured to receive the first driving voltage or the second driving voltage; a protection circuit connected to the first power source input terminal; a first voltage circuit connected to the protection circuit and driven by the first driving voltage; and a second voltage circuit connected to the second power source input terminal and driven by the second driving voltage; wherein the second driving voltage is blocked by the protection circuit and not further transmitted to the first voltage circuit while the second driving voltage is inputted to the first power source input terminal.

Abstract: An optical disk drive with a protection design against a broken disk comprises the following devices of: a chassis; an upper cover mounted above the chassis and having a bended part on a front end thereof; a tray mounted between the chassis and the upper cover for supporting an optical disk; a faceplate mounted on the front end of the upper cover; a door mounted on the front end of the tray; a double-layered retaining plate having a first retaining plate and a second retaining plate located respectively on both front and rear sides of the bended part.

Abstract: A spindle motor includes a base plate, a stator, and a rotor. The base plate has a plurality of air-guiding holes. The stator includes a bearing portion and a plurality of coil portions. The bearing portion is fixed on the base plate. The coil portions are connected to and surrounded the bearing portion, and are disposed above the air-guiding holes. The rotor is rotatably mounted to the bearing portion and disposed adjacent the coil portions.

Abstract: The present invention discloses a circuit board fixing device for fixing a circuit board. The device comprises a chassis for supporting the circuit board, at least one first hook setting on the supporting surface, and at least one second hook setting on the supporting surface. The first hook has a first contact surface for clamping a first type circuit board on the supporting surface. A first distance is between the first contact surface and the supporting surface. Additionally, the second hook has a second contact surface for clamping a second type circuit board on the supporting surface. A second distance is between the second contact surface and the supporting surface. The thickness of the first type circuit board is thicker than that of the second type circuit board, and the first distance is larger than the second distance.

Abstract: The present invention discloses a slim optical disc drive comprising a case with an upper cover and a lower cover, a disc tray for loading and unloading an optical disc, a first circuit board disposed on the lower cover, a second circuit board disposed on the disc tray, and a flexible flat cable for connecting the first circuit board and the second circuit board. The flexible flat cable comprises a fixed portion and a movable portion, and a patch is adhered to the movable portion of the flexible flat cable. The patch has a first end and a second end, and the width of the first end is larger than that of the second end.

Abstract: An optical disk drive with a protection design against a broken disk comprises the following devices of: a chassis; an upper cover mounted above the chassis; a tray mounted between the chassis and the upper cover for supporting an optical disk; a faceplate mounted on the front end of the upper cover and having a first inclined plane; a door mounted on the front end of the tray and having a second inclined plane with a gap opposite to the first inclined plane for forming an inclined directed channel between the faceplate and the door.

Abstract: A method for enhancing the optical initializing operation comprises: sending a radial error signal from an optical pick-up unit to a radial error signal calibration unit; sending the radial error signal from the optical pick-up unit to an offset adjuster; sending a calibrated radial error signal from the radial error signal calibration unit to the offset adjuster and a gain adjuster; sending a radial actuator (RA) signal from the radial error signal calibration unit to activate a radial actuator during an initialization or a period for calculating RE signal calibrating parameters.

Abstract: A method for distinguishing unbalanced disc in an optical disc reproducing/recording apparatus, comprising following steps: moving an optical pickup head to a first position of an optical disc; rotating the optical disc to a predetermined rotating speed; transferring a focus error signal produced by the optical pickup head to a focus control voltage signal; controlling the optical pickup head by the focus control voltage signal to maintain a focus light spot produced by the optical pickup head on the optical disc; and distinguishing if the optical disc is an unbalanced disc according to the focus control voltage signal.

Abstract: A signal-processing device (301) for controlling a focus actuator (309) in an optical disc system (30), wherein the signal processing device (309) generates a focus actuator control signal (CS) to be supplied to the focus actuator (309). The focus actuator control signal (CS) is based on a focus error signal (FE) and a central aperture signal (CA). If the central aperture signal (CA) is equal to or above a certain threshold value the focus actuator control signal will correspond to the focus error signal (FE). However, when the central aperture signal is below the threshold value the focus actuator control signal will have a predefined level. By providing a focus actuator control signal (CS) in accordance herewith it is possible to extend the regions of the focus error signal (FE) in which the relative distance between the focus point and the data layer of the record medium (304) is not correctly represented.

Abstract: A CD-Audio System includes a CD-module and a host unit. The CD-module reads audio data from a disc, checks the audio data for errors, and provides the checked audio data to the host unit at greater than 1 times CD audio rate. The host unit stores the received audio data in an electronic shock protection memory included in the host unit. When the CD-module determines an error in the audio data, the CD-module notifies the host unit of the position in the audio data of the error and when notified of a position in the audio data of an error, the host unit replaces stored audio data at that position and all subsequently already received data with retransmitted audio data. Then the host outputs only validated audio data via speakers.

Abstract: A method for reading/writing data of a disk drive that includes a spindle motor for rotating a disk and a head for reading/writing data from and to the disk. The method includes the steps of; (i) adjusting a position of the head for the first time to space apart the head from a center of the disk at a specific distance, wherein when the head is spaced apart from the center of the disk at the specific distance, the disk vibrates at the minimum magnitude during raising operation of the spindle motor from a low speed to a high speed; (ii) raising the spindle motor from the low speed to the high speed; and (iii) adjusting a position of the head for the second time to move the head to a desired track in the disk for reading/writing data in the desired track.

Abstract: In a tracking control method for use in an optical disk drive to read/write an optical disk, an open-loop tracking control operation of the optical disk drive is first performed according to an input tracking error signal and a predetermined periodical offset to generate a dynamic offset. Afterwards, a closed-loop tracking control operation of the optical disk drive is performed according to the input tracking error signal calibrated with the dynamic offset.

Abstract: A spindle motor includes a base plate, a stator, and a rotor. The base plate has a plurality of air-guiding holes. The stator includes a bearing portion and a plurality of coil portions. The bearing portion is fixed on the base plate. The coil portions are connected to and surrounded the bearing portion, and are disposed above the air-guiding holes. The rotor is rotatably mounted to the bearing portion and disposed adjacent the coil portions.

Abstract: A digital player interface device with exchangeable adapter is provided to comprise an adapter providing with a through hole for load-on/off of a digital player and a first and a second engaging parts on its both end; an adapter-fixing element having a guiding rib and a concavity with a fixing spring; and a chassis having a guiding groove, a restriction groove and a adapter snapper. When the adapter is sliding on the chassis, the adapter pushes the adapter-fixing element moving along the guiding groove, and the fixing spring is released from the restriction groove to engage the first engaging part of the adapter. When the adapter is removed from the chassis, the adapter-fixing element moves back to a home position.

Abstract: A motor control method for rotating an optical disc to be accessed by an optical head includes steps of: providing an increasing power to rotate a motor at increasing speed when a seeking operation of the optical head is performed; and interrupting the increasing power when a jumping operation of the optical head is performed.

Abstract: A method for distinguishing unbalanced disc in an optical disc reproducing/recording apparatus, comprising following steps: moving an optical pickup head to a first position of an optical disc; rotating the optical disc to a predetermined rotating speed; transferring a focus error signal produced by the optical pickup head to a focus control voltage signal; controlling the optical pickup head by the focus control voltage signal to maintain a focus light spot produced by the optical pickup head on the optical disc; and distinguishing if the optical disc is an unbalanced disc according to the focus control voltage signal.

Abstract: A method for reading/writing data of a disk drive that includes a spindle motor for rotating a disk and a head for reading/writing data from and to the disk. The method includes the steps of; (i) adjusting a position of the head for the first time to space apart the head from a center of the disk at a specific distance, wherein when the head is spaced apart from the center of the disk at the specific distance, the disk vibrates at the minimum magnitude during raising operation of the spindle motor from a low speed to a high speed; (ii) raising the spindle motor from the low speed to the high speed; and (iii) adjusting a position of the head for the second time to move the head to a desired track in the disk for reading/writing data in the desired track.