Patent ID: 9696425
Date: 2017-07-04
CPC Classifications: G01S

Claim:
1. An optical distance measuring apparatus for irradiating ranging light on a measuring object and receiving light reflected from the measuring object to measure a distance up to the measuring object, comprising: a light source configured to emit ranging light; a variable reflection angle mirror configured to scan the ranging light on the measuring object; a light receiving device configured to receive light reflected from the measuring object of the ranging light and output signal in accordance with intensity or light quantity of the reflected light; a detected signal amplifying unit configured to amplify an output signal from the light receiving device; an amplification factor control unit configured to generate or calculate a target bias voltage to control the light sensitivity of the light receiving device based on the output signal from the light receiving device, wherein the amplification factor control unit includes a differentiation circuit configured to differentiate the output signal from the light receiving device, and further configured to generate or calculate the target bias voltage based on the output signal from the differentiation circuit; and a distance calculation unit configured to detect a flight time of the ranging light based on the output signal from the detected signal amplifying unit and calculate a distance up to the measuring object, wherein in a first scan period, the amplification factor control unit is configured to generate or calculate the target bias voltage based on the output signal from the light receiving device, and in a second scan period, the detected signal amplifying unit is configured to control the light sensitivity of the light receiving device by the target bias voltage generated or calculated in the first scan period and the distance calculation unit is configured to calculate a distance up to the measuring object.