Dual-Polygon LiDAR Scanning Through Internal Refraction

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional polygon reflectors in LIDAR systems limit the field of view and duty cycle due to the incident light beam being coplanar with reflective facets, restricting the collection of useful return beam data and reducing operational efficiency.

Innovation Solution

A refractive beam-steering assembly using a polygon deflector that deflects light from within the deflector, enhancing both the field of view and duty cycle by directing the beam from an interior position, allowing for more comprehensive scanning.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If conventional polygon reflectors are used with coplanar incident beams, then the system structure is simple, but the field of view and duty cycle are limited

Engineering Contradiction:

Improvefield of viewVSAvoidsystem structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent transitions from a 2D coplanar beam configuration to a 3D spatial arrangement by positioning the incident beam inside the polygon deflector and using refraction at the facet interfaces. This dimensional change allows the beam to be steered over a wider angular range, expanding the field of view beyond the limitations of conventional coplanar reflector systems.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent replaces the conventional reflective mechanism with a refractive mechanism. Instead of using external reflection from coplanar facets, the system uses internal refraction at the polygon facets to deflect the beam. This substitution of the optical mechanism enables greater flexibility in beam steering and expands the operational field of view.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Productivity

If conventional polygon reflectors with coplanar beams are used, then the optical path is simple, but the duty cycle is reduced

Engineering Contradiction:

Improveduty cycleVSAvoidoptical path

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent achieves continuous useful action by eliminating the dead zones associated with coplanar beam configurations. The internal refraction mechanism allows the beam to be continuously steered across the full angular range without interruption, maximizing the duty cycle by ensuring that every facet position contributes to useful scanning coverage.

Inventive Principle:

Principle #20Continuity of useful action

3Loss of information

If incident beam is coplanar with reflective facets, then alignment is straightforward, but return beam data collection is restricted

Engineering Contradiction:

Improvereturn beam dataVSAvoidbeam alignment

Core Design Contradiction:

Loss of informationVSEase of operation

Solution Approach 1:

The patent uses the polygon deflector facets as an intermediary medium that refracts the incident beam to create a separated optical path between the incident and return beams. This intermediary refraction mechanism allows the return beam to be collected from a different spatial direction, preventing it from being blocked by the coplanar incident beam and enabling comprehensive data collection.

Inventive Principle:

Principle #24Intermediary (Mediator)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The refractive polygon deflector system improves the field of view and duty cycle, enabling more efficient data collection and operation of LIDAR systems, particularly in applications like autonomous vehicle control and collision avoidance.

Implementation Method 1

The first polygon scanner is configured to refract the first beam to output a second beam to the second polygon scanner

Methodology Applied

Scientific EffectRefraction: Refraction

Implementation Method 2

The second polygon scanner is configured to refract the second beam to output a third beam

Methodology Applied

Scientific EffectRefraction: Refraction

Data Source

PatentUS20250327899A1Lidar system

Publication Date: 2025.10.23 AURORA OPERATIONS INC

AI summary

A LIDAR system includes a first polygon scanner, a second polygon scanner, and an optic. The first polygon scanner includes a plurality of first facets around an axis of rotation. The second polygon scanner includes plurality of second facets that are outward from the plurality of first facets relative to the axis of rotation. The optic is inward from the first polygon scanner relative to the axis of rotation. The optic is configured to output a first beam to the first polygon scanner. The first polygon scanner is configured to refract the first beam to output a second beam to the second polygon scanner. The second polygon scanner is configured to refract the second beam to output a third beam.