Title: Optical ranging sensor and electrical equipment
Application Number: 200610149518 Application Date: 2006.09.30
Publication Number: 1940474 Publication Date: 2007.04.04
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G01C3/00;G01C3/06;G01C3/22;G01B11/00;G01C3/06;G02B7/28;G02B7/32;G03B13/36
Applicant(s) Name: Sharp KK Address:
Inventor(s) Name:
Attorney & Agent: magao beng yangwu
Abstract:
    An optical ranging sensor 1 includes a light emitting diode 2 , a light projecting lens 3 for condensing light from the light emitting diode 2 and projecting the light onto an object to be ranged, a light receiving lens 4 for condensing reflected light from the object to be ranged, and a light receiving device 5 for receiving the light condensed by the light receiving lens 4 . A signal processing circuit 7 having received two signal currents I 1 , I 2 from the light receiving device 5 outputs output signal S indicating a distance D to the object to be ranged and close-distance signal N indicating whether the object to be ranged is in a close distance zone. According to the optical ranging sensor 1 , the disadvantage that the object being in the close distance zone misdetected as is in the normal ranging zone can be prevented.
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