SENSOR DEVICE

To accurately detect the deflection angle of a movable reflection body.SOLUTION: The length in a first direction X of an overlapping portion of a first visual field F1 and a second visual field F2 is progressively extended as the deflection angle of oscillation of a movable reflection body 120 around a first axis of rotation increases. The length in a second direction Y of the overlapping portion of the first visual field F1 and the second visual field F2 is progressively extended as the deflection angle of oscillation of the movable reflection body 120 around a second axis of rotation increases. The length in the first direction X of the overlapping portion of the first visual field F1 and the second visual field F2 is progressively reduced as the deflection angle of oscillation of the movable reflection body 120 around the first axis of rotation decreases. The length in the second direction Y of the overlapping portion of the first visual field F1 and the second visual field F2 is progressively reduced as the deflection angle of oscillation of the movable reflection body 120 around the second axis of rotation decreases.SELECTED DRAWING: Figure 3 【課題】可動反射体の振れ角を正確に検出する。【解決手段】第１視野Ｆ１及び第２視野Ｆ２の重なり部分の第１方向Ｘの長さは、可動反射体１２０の第１回転軸の周りの揺動の振れ角が大きくなるほど長くなっている。第１視野Ｆ１及び第２視野Ｆ２の重なり部分の第２方向Ｙの長さは、可動反射体１２０の第２回転軸の周りの揺動の振れ角が大きくなるほど長くなっている。第１視野Ｆ１及び第２視野Ｆ２の重なり部分の第１方向Ｘの長さは、可動反射体１２０の第１回転軸の周りの揺動の振れ角が小さくなるほど短くなっている。第１視野Ｆ１及び第２視野Ｆ２の重なり部分の第２方向Ｙの長さは、可動反射体１２０の第２回転軸の周りの揺動の振れ角が小さくなるほど短くなっている。【選択図】図３