Patent Number: 7,820,957

Title: Optical encoder for detecting movement of a moving object and electronic equipment including the optical encoder

Abstract: This optical encoder includes a light emitting section and a plurality of light receiving elements placed so as to be aligned in one direction in an area where a light beam from the light emitting section may reach. The moving object includes a light-ON section and a light-OFF section. The light receiving element detects movement of the moving object when the light-ON section and the light-OFF section of the moving object pass through a predetermined position corresponding to the light receiving element A light receiving signal processing section receives inputs of a plurality of light receiving signals with different phases from a plurality of the light receiving elements, performs signal processing including at least one signal processing among a logical operation processing, an addition processing, and a subtraction processing on a plurality of the light receiving signals, and outputs an output signal containing a plurality of signal components which are different in phase and different in signal level with respect to a predetermined threshold level.

Inventors: Kimura; Tadamasa (Tenri, JP), Okada; Norikazu (Kashihara, JP)

Assignee: Sharp Kabushiki Kaisha

International Classification: G01D 5/34 (20060101); H01L 31/00 (20060101)

Expiration Date: 2018-10-26 0:00:00