| 摘要 |
<P>PROBLEM TO BE SOLVED: To ensure accuracy in measuring a distance even if an environmental temperature changes. <P>SOLUTION: A lens array 12 is formed by arranging lenses and light-shield parts on the same plate-like member. The distance of apertures and a base length of the lens change by the same amount of change in accordance with a change in environmental temperature, thereby causing no displacement between the lens array and the light-shield part. When the environmental temperature changes, the base length of the lenses 15 in the lens array 22 and the distance between the light-shield parts 16 change by the same rate of change. The rate of change of the base length of the lenses 15 is the same as that of parallax of the image formed on an imaging area 14 obtained by the light having transmitted the lenses. The above rates of change are canceled in a ranging formula. Consequently, the distance can be accurately measured using the ranging calculation even if the environmental temperature changes. <P>COPYRIGHT: (C)2012,JPO&INPIT |
