Abstract: The present invention relates to a distance measurement system comprising: a sensor unit for generating and transmitting a signal and receiving a reflected signal reflected back from an object; a buffer for temporarily storing data; and a control unit which calculates the distance to the object by measuring the time from when the signal is transmitted from the sensor unit to when the reflected signal is received. According to the present invention, the proposed distance measurement system uses an algorithm combining probability and moving average, thus having the effect of significantly improving the reliability of distance measurement compared to existing modes of distance detection.

Abstract: An optical information storage medium system is provided. The optical information storage medium system includes an optical pickup, which comprises a photo-detector configured to control light power detected by receiving a portion of light emitted from a light source and obtains an output signal proportional to output light power of the light source from a signal detected by the photo-detector, and a signal processor configured to signal-process the output signal input from the optical pickup. The signal processor includes a sensitivity acquisition unit configured to acquire a sensitivity value of the photo-detector, a gain calculator configured to calculate a target gain value to be used in comparing the sensitivity value of the photo-detector, which is acquired by the sensitivity acquisition unit, with a target sensitivity value to be used by the optical information storage medium system, and a gain adjustment unit.

Abstract: An optical pickup, photodetector, and optical drive adopting the optical pickup are provided. The optical pickup may include a light emitting system having a plurality of light sources corresponding to a plurality of mediums a light receiving system including a photodetector for converting light reflected from a medium into an electrical signal. The photodetector may include first and second light receiving sensors corresponding to the plurality of mediums, each of the first and second light receiving sensors comprising a plurality of regions, each region comprising a plurality of sectors. The plurality of regions of the first and second light receiving sensors may include shared sectors that are shared by the first and second light receiving sensors and exclusive sectors that are exclusively used in the first light receiving sensor or the second light receiving sensor.

Abstract: An optical information storage medium system is provided. The optical information storage medium system includes an optical pickup, which comprises a photo-detector configured to control light power detected by receiving a portion of light emitted from a light source and obtains an output signal proportional to output light power of the light source from a signal detected by the photo-detector, and a signal processor configured to signal-process the output signal input from the optical pickup. The signal processor includes a sensitivity acquisition unit configured to acquire a sensitivity value of the photo-detector, a gain calculator configured to calculate a target gain value to be used in comparing the sensitivity value of the photo-detector, which is acquired by the sensitivity acquisition unit, with a target sensitivity value to be used by the optical information storage medium system, and a gain adjustment unit.

Abstract: An optical pickup, photodetector, and optical drive adopting the optical pickup are provided. The optical pickup may include a light emitting system having a plurality of light sources corresponding to a plurality of mediums a light receiving system including a photodetector for converting light reflected from a medium into an electrical signal. The photodetector may include first and second light receiving sensors corresponding to the plurality of mediums, each of the first and second light receiving sensors comprising a plurality of regions, each region comprising a plurality of sectors. The plurality of regions of the first and second light receiving sensors may include shared sectors that are shared by the first and second light receiving sensors and exclusive sectors that are exclusively used in the first light receiving sensor or the second light receiving sensor.

Abstract: An optical pick up, including: a laser diode which outputs a light in response to an input current; a photo diode which receives the light and outputs a voltage; a digital potentiometer which adjusts the voltage output by the photo diode according to a voltage adjusting signal; and a controller which outputs the input current, sets a first reference voltage to be outputted by the photo diode according to the light, and outputs the voltage adjusting signal to the digital potentiometer according to a difference between the output voltage and the reference voltage.

Abstract: An optical pick up, including: a laser diode which outputs a light in response to an input current; a photo diode which receives the light and outputs a voltage; a digital potentiometer which adjusts the voltage output by the photo diode according to a voltage adjusting signal; and a controller which outputs the input current, sets a first reference voltage to be outputted by the photo diode according to the light, and outputs the voltage adjusting signal to the digital potentiometer according to a difference between the output voltage and the reference voltage.