LENS FOR RECEIVING LIGHT, LIGHT RECEIVING DEVICE, PHOTOELECTRIC SENSOR AND LASER RADAR USING THEM AND VEHICLE LOADING LASER RADAR

摘要

PURPOSE:To realize the angle of visibility as wide as possible and to obtain the almost uniform distribution of received light quantity by condensing light beams made incident from respective light receiving areas beared by plural lens parts and having different incident angles at one place. CONSTITUTION:When the optical axis (reference optical axis) of the central lens part L1 is defined as O1 and the optical axes of the lens parts L2 and L3 on both sides are respectively defined as O2 and O3, the optical axes O2 and O3 of the lens parts L2 and L3 on both sides are deviated from the reference optical axis O1. The lens part; L2 and L3 have the different angle of visibility from that of the lens part L1. Besides, the lens parts L1, L2 and L3 have a common focusing position at one place and the light receiving surface 21 of a photodetector 20 is arranged at the focusing position. Therefore, since different visual field ranges are respectively beared by the lens parts L1, L2 and L3, the whole of the angles of the visibility thereof becomes the angle of the visibility of a lens 10. Thus, the lens parts L1, L2 and L3 have an almost identical light receiving area and the received light quantity can be uniformized within the range of the desired angle of visibility.