METHOD OF MEASUREMENT, OPTICAL SCANNER, AND IMAGE FORMING APPARATUS

摘要

PROBLEM TO BE SOLVED: To measure the shift amount of write starting timing in a plurality of scanning lines in real time and with high precision. SOLUTION: A write control circuit 219 includes: a synchronous lighting control circuit 219c which selects a front end synchronous light emission part and a rear end synchronous light emission part, and generates a plurality of synchronous lighting signals for lighting the selected light emission parts; a measurement circuit 219d for two points, which measures the time interval of rising time of a front end synchronous detection signal and the rising time of a rear end synchronous detection signal; and a correction data generation circuit 219e which individually generates correction data in the respective light emission parts on the basis of the measured results or the like at the measurement circuit 219d for two points. Thus, the shift amount of the beginning times of write of the light emission parts ch2 to ch16 with respect to the light emission part ch1 are individually obtained in real time and with higher accuracy than the conventional art as the correction data with a "phase difference corresponding time" as a unit. COPYRIGHT: (C)2010,JPO&INPIT