| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that conventionally a switch for each direction is required to recognize obstacles in all directions, and a switch mechanism is easily damaged or a contact is worn out due to repeated impact strength, since ON/OFF operations is repeated at each collision to the obstacles, so that obstacles tend not to be detected. SOLUTION: A fixation part is provided with a recess 10 at least at the forward end in the advance direction, a movable part is in a shape for covering at least the front, left, right, oblique left front, and right oblique front, the fixation part or the movable part has a flat projection that projects to the recess, further a slit in a specific shape is formed at the projection, a support 4 for pinching the slit of the projection from upper and lower directions is mounted to the movable and fixation parts, and two light-emitting devices, and photodetectors for forming at least two pairs of sensing means 20 and 20 are mounted to the support. |
