DISTANCE MEASURING DEVICE, AND DISTANCE MEASURING METHOD

• Main Authors: SUGA TAKAHIRO, SHOJI TAKESHI
• Format: Patent
• Language: English; Japanese
• Published: 16.10.2023
• Subjects: ANALOGOUS ARRANGEMENTS USING OTHER WAVES; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES; MEASURING; PHYSICS; RADIO DIRECTION-FINDING; RADIO NAVIGATION; TESTING

To provide a technique that can measure the position of an object with higher accuracy by using a distance measuring device using a time-of-flight (TOF) system.SOLUTION: A distance measuring device comprises: a light source (33) that emits pulse-like detection light; a light receiving unit (35) that receives the detection light reflected on an object; a distance calculation unit (22b) that calculates the distance to the object based on the time of emission of the detection light and the time of reception of the reflected light; and a window unit (3a) that is arranged between the light source and the object, the distance measuring device further comprising: a peak value detection unit (220) that detects a peak value of an output signal from the light receiving unit; a peak width derivation unit (221) that derives a peak width of the output signal from the light receiving unit based on the detected peak value; a trailing time detection unit (222) that detects the trailing time in the output signal from the light receiving unit; and a light reception time calculation unit (224) that calculates the time of reception of the reflected light according to the peak width and the trailing time.SELECTED DRAWING: Figure 9 【課題】ＴＯＦ（Ｔｉｍｅ ｏｆ Ｆｌｉｇｈｔ）方式を用いた距離測定装置を用いて、より精度よく、対象物の位置を測定可能な技術を提供する。【解決手段】パルス状の検出光を出射する光源（３３）と、検出光の対象物による反射光を受光する受光部（３５）と、検出光の出射時間と反射光の受光時間とに基づいて、対象物までの距離を算出する距離算出部（２２ｂ）と、光源と対象物の間に配置されるウィンドウ部（３ａ）と、を備え、受光部の出力信号のピーク値を検知するピーク値検知部（２２０）と、検知されたピーク値に基づいて、受光部の出力信号のピーク幅を導出するピーク幅導出部（２２１）と、受光部の出力信号における立下り時間を検知する立下がり時間検知部（２２２）と、ピーク幅と立下り時間によって、反射光の受光時間を算出する受光時間算出部（２２４）と、を備える。【選択図】図９