| 摘要 |
PURPOSE:To bring the contrast between objects into clear relief to measure accurately the distance between cars going in the same direction, by installing respective image sensors of a pair of optical mechanisms so as to be inclined at the same prescribed angle to respective optical axes in the circumferential direction. CONSTITUTION:Linear image sensors 2a and 2b where the image of an object 3 is focused through lenses 1a and 1b are provided a prescribed length F apart from lenses 1a and 1b respectively to constitute optical mechanisms A and B. The length between optical axes of optical mechanisms A and B is set to a prescribed length L, and lenses 1a and 1b and image sensors 2a and 2b are arranged on vertical lines to both optical axes. Image sensors 2a and 2b are installed so as to be made incline at the same prescribed angle to respective optical axes in the circumferential direction and grasp linear image visual fields inclined from horizontal positions to include different constitutions, thus obtaining the contrast of the object clearly. |
