RECEIVING OPTICAL SYSTEM, LIDAR SYSTEM AND TERMINAL DEVICE

A receiving optical system, a lidar system, and a terminal device are provided to resolve a problem in the conventional technology that a dynamic range of a detection module is low, and are applied to fields such as autonomous driving, intelligent driving, assisted driving, or a networked vehicle. The receiving optical system includes a receiving module and a detection module. The receiving module is configured to receive an echo signal obtained by reflecting signal light by a target in a detection region, and a horizontal focal plane and a vertical focal plane of the echo signal are separated. The detection module is configured to perform optical-electrical conversion on the echo signal, to obtain an electrical signal used to determine association information (such as a distance, a speed, or a grayscale) of the target. Based on this, a light spot of the echo signal received by the detection module is diffused in a direction corresponding to the vertical focal plane or in a direction corresponding to the horizontal focal plane, can cover a large light sensitive area of the detection module, and can reduce a quantity of photons received in a unit light sensitive area, so that a higher-strength echo signal can be detected in the unit light sensitive area, and a dynamic range of the detection module can be improved.