This paper presents a new Optical Detector that provides a high-speed
AF control. The Optical Detector detects data to control AF, AE and AW
E. A conventional Optical Detector detects only one characteristic dat
a in a field, however, the new OPD detects several characteristic data
in a field. Therefore this new Optical Detector can execute high spee
d detection for AF control. The new Optical Detector implements above
function by switching filter coefficient every line.