Abstract: An optical storage system modulates a laser beam based on a high frequency modulation (HFM) signal and a pattern to be recorded on an optical storage medium. At least one of an amplitude and a frequency of the HFM signal is adjusted when using the light beam to record the pattern on the optical storage medium or read data from the medium.

Abstract: A foldable stand for supporting a machine can be folded or extended between a collapsed position, an extended supporting position, and a hand carrying position. The foldable stand includes a platform formed by two bearing bars that define a bearing surface for supporting a machine. Two support units are pivotally connected to the bearing bars and can be pivoted, and selectively locked, between a collapsed position, an extended supporting position, and a hand carrying position. The selective locking is achieved by the selective engagement of positioning devices with locating grooves formed on the foldable stand.

Abstract: An optical storage system modulates a laser beam based on a high frequency modulation (HFM) signal and a pattern to be recorded on an optical storage medium. At least one of an amplitude and a frequency of the HFM signal is adjusted when using the light beam to record the pattern on the optical storage medium or read data from the medium.

Abstract: A foldable stand for supporting a machine can be folded or extended between a collapsed position, an extended supporting position, and a hand carrying position. The foldable stand includes a platform formed by two bearing bars that define a bearing surface for supporting a machine. Two support units are pivotally connected to the bearing bars and can be pivoted, and selectively locked, between a collapsed position, an extended supporting position, and a hand carrying position. The selective locking is achieved by the selective engagement of positioning devices with locating grooves formed on the foldable stand.

Abstract: An optical storage system includes an optical pickup unit movable across an optical medium. The optical pickup unit has a light detector, a laser diode, and a laser driver signal processor circuit. The laser driver signal processor circuit includes a detected signal processing block for outputting read signals corresponding to light received at the light detector, and a read signal processing block for processing the read signals and generating control signals or synthesis signals according to the read signals. A control unit is coupled to the optical pickup unit for controlling the optical pickup unit and decoding data recovered from the optical medium. The optical storage system further includes encryption and decryption modules or error detection modules for securing commands and information sent between the control unit and the laser driver signal processor circuit against reverse engineering.

Abstract: An optical storage system includes an optical pickup unit movable across an optical medium. The optical pickup unit has a light detector, a laser diode, and a laser driver signal processor circuit. The laser driver signal processor circuit includes a detected signal processing block for outputting read signals corresponding to light received at the light detector, and a read signal processing block for processing the read signals and generating control signals or synthesis signals according to the read signals. A control unit is coupled to the optical pickup unit for controlling the optical pickup unit and decoding data recovered from the optical medium.

Abstract: An optical disc drive includes a servo system and a system behavior detection module. The system behavior detection module includes a controller and a signal feeding unit coupled to the controller and the servo system. The controller is operable in a detection mode and in a normal operation mode. In the detection mode, the controller enables the signal feeding unit so as to introduce an exciting signal into the servo system. In the normal operation mode, the controller disables the signal feeding unit so as to inhibit introduction of the exciting signal into the servo system.

Abstract: An optical storage system includes an optical pickup unit movable across an optical medium. The optical pickup unit has a light detector, a laser diode, and a laser driver signal processor circuit. The laser driver signal processor circuit includes a detected signal processing block for outputting read signals corresponding to light received at the light detector, and a read signal processing block for processing the read signals and generating control signals or synthesis signals according to the read signals. A control unit is coupled to the optical pickup unit for controlling the optical pickup unit and decoding data recovered from the optical medium. The optical storage system further includes encryption and decryption modules or error detection modules for securing commands and information sent between the control unit and the laser driver signal processor circuit against reverse engineering.

Abstract: An optical storage system modulates a laser beam based on a high frequency modulation (HFM) signal and a pattern to be recorded on an optical storage medium. At least one of an amplitude and a frequency of the HFM signal is adjusted when using the light beam to record the pattern on the optical storage medium or read data from the medium.

Abstract: An optical storage system includes an optical pickup unit movable across an optical medium. The optical pickup unit has a light detector, a laser diode, and a laser driver signal processor circuit. The laser driver signal processor circuit includes a detected signal processing block for outputting read signals corresponding to light received at the light detector, and a read signal processing block for processing the read signals and generating control signals or synthesis signals according to the read signals. A control unit is coupled to the optical pickup unit for controlling the optical pickup unit and decoding data recovered from the optical medium.

Abstract: An automatic laser power control apparatus for an optical recording system includes a drive voltage generator and a control unit. The drive voltage generator amplifies a selected control voltage or target value for output. When the control voltage is selected by the drive voltage generator, the apparatus works in a closed-loop control mode. When a recording or reading process is interrupted, the control unit generates a calculated variable gain value based on operation parameters, such as the drive voltage, the control voltage, the variable gain value and the target value, prior to interruption. At the end of interruption, the control unit enables the drive voltage generator to generate the requisite drive voltage according to the recording speed and link point condition, thereby generating the voltage or control state that approximates the closed-loop condition so that there is almost zero transient response in the system.

Abstract: An optical disc drive includes a servo system and a system behavior detection module. The system behavior detection module includes a controller and a signal feeding unit coupled to the controller and the servo system. The controller is operable in a detection mode and in a normal operation mode. In the detection mode, the controller enables the signal feeding unit so as to introduce an exciting signal into the servo system. In the normal operation mode, the controller disables the signal feeding unit so as to inhibit introduction of the exciting signal into the servo system.

Abstract: A control module for an automatic gain control device of an optical disc playback apparatus includes a constant-gain setting member and a switch member. The playback apparatus includes an optical pickup head for reading an optical disc. The constant-gain setting member provides a constant gain signal. The switch member connects the constant-gain setting member to the automatic gain control device so as to set the automatic gain control device at a predetermined gain when the optical pickup head reads a non-recorded area of the optical disc or performs a track jump operation.

Abstract: A passive control system for taking a three dimensional picture comprises a 2D-3D converting device, and a rotary disk apparatus. The 2D-3D converting device at one end thereof connects with a digital picture taking apparatus via a shift interface and at the other end thereof connects with a data processing center. The 2D-3D converting device provides a preset program to regulate the digital picture taking apparatus with a start of scanning at a preset time. The rotary disk apparatus provides a positioning interface to connect with a rotary disk thereof and the rotary disk is able to stay in place after turning a preset angular displace in accordance with the preset program. An object to be taken a picture is placed on the rotary disk and is taken a picture by the digital picture taking apparatus as soon as the rotary disk is turned the preset angular displacement once.