Object detection device; Object detection method and design method for object detection device

摘要

An object detection device (10) is provided, comprising: a lens assembly (23) that converts laser light that is emitted through a plurality of light emission points (21a1 to 21a3) to a laser beam (L1) with an angle of divergence in an arrangement direction of a plurality of light emission points (21a1 to 21a3) converting; and an optical assembly (30, 40) that projects the laser beam (L1, L2) outward along an optical axis and directs an incident light (L3, L4) along the optical axis to a light receiving element (43). The optical assembly (30, 40) is provided with a converging lens (42), which forms an image of the incident light (L4) on a focal plane, and an aperture (44), which lies on the focal plane. The aperture (44) satisfies α ≤ β, where α is the divergence angle along the arrangement direction of the plurality of light emitting points (21a1 to 21a3), D is a size of a light passage area (44a) of the aperture (44) in a direction corresponding to the divergence angle, d one Distance between the converging lens (42) and the aperture (44), and β = arctan (D / d).