DISTANCE IMAGE MEASURING DEVICE

To provide a distance image measuring device capable of sequentially confirming the presence or absence of abnormality.SOLUTION: A distance image measuring device 1 includes: a light source 21; an image sensor 22; a housing 10; a window 12; and a distance calculation section for calculating a distance to an object on the basis of flight time. The distance image measuring device includes: a liquid crystal panel 33 that is arranged at a side closer to the light source 21 and the image sensor 22 than the window 12, that is capable of switching between a reflection state in which projected light Lp is reflected in a direction toward the image sensor 22 and a transmission state in which the projected light Lp is transmitted, and that is fixed to an inside of the device; and an abnormality determination section in which reference internal reflected light generated by reflection of the projected light Lp by the liquid crystal panel 33 in the reflection state can be detected by a visual field corresponding region of the image sensor 22, and which determines whether the distance calculated by the distance calculation section on the basis of reference internal reflected light received in the image sensor 22 with the liquid crystal panel 33 being in the reflection state falls within a normal range, and which determines whether there is an abnormality in a function of detecting the object existing in an observation field.SELECTED DRAWING: Figure 1 【課題】異常の有無を逐次確認することができる距離画像測定装置を提供する。【解決手段】光源２１と、画像センサ２２と、筐体１０と、窓１２と、飛行時間に基づいて物体までの距離を算出する距離算出部とを備えた距離画像測定装置１であって、窓１２よりも光源２１および画像センサ２２側に配置され、投射光Ｌｐを画像センサ２２の方向に反射する反射状態と投射光Ｌｐが透過する透過状態とが切替可能であり装置内に固定されている液晶パネル３３を備え、反射状態になっている液晶パネル３３で投射光Ｌｐが反射されて生じた基準内部反射光が、画像センサ２２の視野対応領域により検出できるようになっており、液晶パネル３３を反射状態として、画像センサ２２に受光された基準内部反射光に基づいて距離算出部が算出した距離が正常範囲か否かを判断することで、観測視野に存在する物体を検出する機能に異常があるか否かを判断する異常判断部を備える。【選択図】図１