Abstract: A light emitting structure has a substrate, a divider, a light guide element and a light emitting element. The divider is connected with the substrate and erected from the substrate. The light guide element is connected with the divider. The divider is positioned in between the substrate and the light guide element. A chamber is delineated by the substrate, the divider and the light guide element. The light emitting element is mounted onto the substrate, surrounded by the divider, accommodated within the chamber and transparent. The light guide element has an external surface, an internal surface and a convex section and/or a concave section. The external surface and the internal surface are oppositely positioned to each other. The external surface faces away from the substrate. The internal surface faces towards the substrate. The convex section and/or the concave section is formed on the external surface and/or the internal surface.

Abstract: A signal gain control method and system for use in optical disc drives to prevent undesirable saturation occurrences in circuit operations. The method includes fetching a preset reading front monitor diode signal and a preset gain controlling signal for reading; generating a front monitor diode signal by a front monitor diode signal conversion circuit; calculating a gain controlling signal based on the preset gain controlling signal for reading, the preset reading front monitor diode signal, and the front monitor diode signal by a signal processor; adjusting a gain for detection signals according to the gain controlling signal by a gain adjustment unit; and generating control signals according to the adjusted detection signals by a pre-amp module.

Abstract: A signal gain control method and system for use in optical disc drives to prevent undesirable saturation occurrences in circuit operations. The method includes fetching a preset reading front monitor diode signal and a preset gain controlling signal for reading; generating a front monitor diode signal by a front monitor diode signal conversion circuit; calculating a gain controlling signal based on the preset gain controlling signal for reading, the preset reading front monitor diode signal, and the front monitor diode signal by a signal processor; adjusting a gain for detection signals according to the gain controlling signal by a gain adjustment unit; and generating control signals according to the adjusted detection signals by a pre-amp module.

Abstract: An optimal power calibration (OPC) method calibrates writing power for an optical disc. The optical disc includes a power calibration area, with a plurality of counting units and test blocks. The OPC method includes generating a plurality of first power levels by using an indicated power, selecting a plurality of second power levels from the first power levels, recording test data onto test blocks with the second power levels, reading the test blocks, and generating data signals and first beta values. The method further includes generating estimated optimal power by a calculating algorithm, generating a plurality of third power levels by using the estimated optimal power, recording test data onto test blocks with the third power levels, reading the test blocks, and generating data signals and second beta values. Optimal power is calculated by using the estimated optimal power, the first beta values, and the second beta values.

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: An optimal power calibration (OPC) method calibrates writing power for an optical disc. The optical disc includes a power calibration area, with a plurality of counting units and test blocks. The OPC method includes generating a plurality of first power levels by using an indicated power, selecting a plurality of second power levels from the first power levels, recording test data onto test blocks with the second power levels, reading the test blocks, and generating data signals and first beta values. The method further includes generating estimated optimal power by a calculating algorithm, generating a plurality of third power levels by using the estimated optimal power, recording test data onto test blocks with the third power levels, reading the test blocks, and generating data signals and second beta values. Optimal power is calculated by using the estimated optimal power, the first beta values, and the second beta values.

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.