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OPTICAL SENSOR, LIMITED REGION TYPE OPTICAL SENSOR, OPTICAL DISK DISCRIMINATING SENSOR, OPTICAL DISK TILT DETECTING SENSOR, COPYING DEVICE, AND MOVING BODY DETECTING DEVICE
OPTICAL SENSOR, LIMITED REGION TYPE OPTICAL SENSOR, OPTICAL DISK DISCRIMINATING SENSOR, OPTICAL DISK TILT DETECTING SENSOR, COPYING DEVICE, AND MOVING BODY DETECTING DEVICE
PROBLEM TO BE SOLVED: To miniaturize various kinds of optical sensors, etc., by installing a diffraction grating or an optical axis converting element such as a prism on the light-receiving side, equipped with a light-receiving lens and a light-receiving element, to optical-axis- convert and receive reflected light from an object to be detected. ;SOLUTION: The zero order and ± 1st order diffracted lights of outgoing infrared light have an angle of 37° with each other, and are reflected by an object at a detecting point. Light-receiving beams 32b and 32c on both sides of reflected light are incident on a light-receiving side diffraction grating 31 at an angle of 37° to a light-receiving lens 30, to have an angle of 13° by optical axis conversion to be incident on the light- receiving lens 30, and then are focused to light-receiving elements 29b and 29c on both sides. Concurrently, the center light-receiving beam 32a goes straight on to be condensed into a light-receiving element 29a. This narrows a light-receiving visual field angle in the light-receiving lens 30 to reduce off-axis aberration, thereby allowing the smallness of the light-receiving elents 29a-29c, also arranging them on the same plane.;COPYRIGHT: (C)1998,JPO
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