Light emitting device for laser radar, design method and laser radar

By setting a dimming component between the transmitting component and the collimating component of the lidar and setting a microlens array downstream of the optical path of the emission unit, the problems of insufficient field-of-view aspect ratio and uneven energy distribution in the prior art are solved, a larger aspect ratio and a more uniform field of view are achieved, and the accuracy of the detection results is improved.

CN119716814APending Publication Date: 2025-03-28HESAI TECH CO LTD
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Patent Information

Application Number
CN202311284117.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-09-28
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

It is difficult for existing lidars to achieve a field of view with a larger aspect ratio, and the lack of field of view energy caused by the spacing between adjacent transmitting units affects the accuracy of the detection results.

Method used

A dimming assembly is arranged between the emitting assembly and the collimating assembly, each dimming assembly modulates the emitted beams of the corresponding emitting units such that the fields of view formed by the light beams emitted from the collimating assembly overlap or abuts each other. Meanwhile, a microlens array is arranged downstream of the optical path of the emitting unit to modulate the emitted light beam to compensate for the energy loss caused by the interval between adjacent emitting units.

Benefits of technology

It improves the continuity of the field of view range and the uniformity of energy distribution, achieves a larger aspect ratio field of view, reduces the risk of target missed detection, and improves the accuracy of detection results.

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Abstract

The invention provides a light emission device for a laser radar, and the device comprises an emission assembly which at least comprises a first emission unit and a second emission unit, the first emission unit and the second emission unit are mutually spaced, each emission unit is configured to emit a light beam, and each emission unit comprises a light-emitting unit array; the light modulation assembly is arranged at the downstream of the light path of the transmitting assembly, the light modulation assembly at least comprises a first light modulation unit and a second light modulation unit, and each light modulation unit corresponds to one transmitting unit and is configured to modulate the transmitting light beam of the transmitting unit corresponding to the light modulation unit; and the collimation assembly is arranged at the downstream of the light path of the dimming assembly and is configured to shape the light beams modulated by the dimming assembly, so that view fields formed by the light beams emitted from the collimation assembly are mutually overlapped or adjacently connected. According to the light emitting device, the dimming assemblies are arranged between the emitting assembly and the collimation assembly, and each dimming assembly can modulate the emitted light beams of the corresponding emitting unit, so that view fields formed by the light beams emitted from the collimation assembly are mutually overlapped or adjacently connected; therefore, part of view field energy loss caused by the interval between the adjacent emission units is made up, and the continuity of the view field range is improved to form a view field with a larger length-width ratio.
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