Focusing-position-detection circuit

摘要

A focusing position detection circuit provided with a pair of light receiving element arrays respectively disposed in front of and behind a predetermined focusing plane of an optical system, capable of determining the position of the optical system by the output signals of the light receiving element arrays, and outputting an analog signal corresponding to the position of the optical system in the defocused range, but in the focused range with a predetermined tolerance, outputting a focused signal at a predetermined level.