Optical range finder i.e. light running time-camera system, for measuring distance of object, has receiving lens designed as Fresnel lens with two lens contours, where focal length of one of contours is smaller than that of other contour

摘要

The range finder (1) has a photo sensor or light running time sensor (22), and a transmission unit (10) comprising an illumination light source (12) and a beam molding lens (15). A modulator (30) is connected with the sensor and the light source. A receiving lens (25) is designed as a Fresnel lens having two lens contours with different focal lengths. The contours are formed such that the length of one of the contours is smaller than the length of another contour. The length of the latter contour has a focal point and/or a focal length in spatial proximity to the sensor.