| 摘要 |
PROBLEM TO BE SOLVED: To carry out timing adjustment even for a CCD of a sample hold output type and establish a read timing for and to correctly set a sampling signal at sampling timing by an AFE (Analog Front End). SOLUTION: When the AFE 133 incorporates an output signal from a CCD 132, and performs the timing adjustment for the sampling signal in A/D conversion, it sets a phase of the sampling signal in a default condition at a first time, obtains image reading data at the sampling timing, and stores it as the current value. When the last value exists, the device discriminates that the sampling signal reaches reset noise by this time setting value if a difference of the last value and current value is equal or more than the threshold value, and establishes the phase of the sampling signal to a position in which the AFE 133 samples a hold unit of the CCD output. Since the phase is shifted in a direction which becomes late in detection, the phase is adjusted in a direction which brings the phase forward after sampling position detection. COPYRIGHT: (C)2011,JPO&INPIT |
