Patent ID: 11719824

Abstract:
The present invention is to provide a distance measuring device capable of distinguishing between a reflection from fog or the like and a reflection from an actually existing object in an environment such as fog.The invention is a distance measuring device including a light-emitting element 12 that transmits a signal, a light-receiving element 15 that receives a signal transmitted by the light-emitting element 12 and reflected by an object, and outputs a reception signal corresponding to a received signal strength, a comparator 19 that outputs a first signal equal to or greater than a first threshold value with respect to signal strength and a second signal equal to or greater than a second threshold value higher than the first threshold value from the reception signal, and a signal processing unit 10 that distinguishes the reception signal as valid or invalid or not from a relationship between a first time span from when the first signal becomes equal to or greater than the first threshold value until the first signal becomes less than the first threshold value and a second time span from when the second signal becomes equal to or greater than the second threshold value until the second signal becomes less than the second threshold value.