JPS5934372U - distance measuring device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

Fig. 1 is a block diagram showing a conventional distance measuring device, Fig. 2 is a diagram showing the reason why an error occurs, and Fig. 3 is a block diagram showing an embodiment of this invention. is a comparator, 8.10 is a counter, and 11 is an arithmetic circuit. Note that the same or corresponding parts in the figures are indicated by the same reference numerals.

Claims (1)

[Scope of utility model registration request] a laser oscillator; a first detector that detects the output timing of the transmitting laser from the laser oscillator; a transmitting optical system that irradiates the output light of the transmitting laser onto a target; a receiving optical system that collects the reflected light that has been irradiated and returned; a second photodetector that photoelectrically converts the light received by the receiving optical system; and amplifying the output of the second photodetector. a first comparator that discriminates the output of the amplifier using a first reference voltage to generate a first reception timing; and a first comparator that counts the interval between the output timing of the transmitting laser and the first reception timing. a second comparator that discriminates the output of the amplifier using a second reference voltage different from the first reference voltage to create a second reception timing; 1. A distance measuring device comprising: a second counter that counts the interval between the two reception timings; and an arithmetic circuit that calculates the count values of the first counter and the second counter.