| 摘要 |
PROBLEM TO BE SOLVED: To obtain a distance-detecting device which is low-cost, by which a distance up to a subject for photography such as the distance between vehicles or the like can be detected and by which the position of a vehicle with reference to a running lane can be detected by a method wherein the interval between formed images by a lens which image-forms an object to be measured and by one pair of image formation lenses which image-form the formed image of the lens again is detected and a distance up to the object, to be measured on the basis of the distance between the formed images is computed. SOLUTION: Regarding a lens 11 for distance detection, L=1/[1/f+1/(c-(Fv/β)*(l0-l))], wherein L represents a distance up to a subject S, (b) represents a distance up to an image formation point from the lens 11, (f) represents a focal length, (d) represents a defocus amount, Fv represents a prescribed variable,βrepresents the magnification of a separator lenses 14a, 24b, l0 represents the interval between formed images when focused, and l represents the interval between formed images when focuses at the front. Thereby, the distance up to the subject S for photography can be found on the basis of the intervals l, l0 between the formed images. On the other hand, in a distance-detecting single body which is constituted inside a lens barrel, its detecting direction is changed to two orthogonal directions by a right-and-left-direction scanning and drive means. On the basis of the detected interval between the formed images, the distance up to the subject for photography is detected by an image- interval computing means.
|
