Lidar Sensor Shielding Assembly for EMI and Light Leakage

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Solution Overview

Problem

High-speed pulsing of laser diodes in LIDAR sensors causes bias instability and generates signal noise, and direct light leakage leads to unintended activation in the second body tube.

Innovation Solution

A shielding assembly unit is introduced between the transmission and reception light paths, comprising shielding units and a separation unit to absorb and block electromagnetic interference and light leakage, ensuring that transmission and reception lights do not cross over, and a baffle system is used to cancel noise by restricting light movement within predetermined grooves.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If high-speed pulsing of laser diode is used, then measurement speed is improved, but signal noise increases and bias instability occurs

Engineering Contradiction:

Improvemeasurement speedVSAvoidbias stability

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The patent divides the optical system into separate transmission and reception paths using distinct body tubes (first body tube for transmission, second body tube for reception). This segmentation prevents electromagnetic interference from the high-speed pulsing laser diode from affecting the reception path, thereby maintaining measurement speed while improving bias stability and reducing signal noise.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a shielding assembly unit as an intermediary between the transmission and reception paths. This shielding unit blocks electromagnetic interference and light leakage, allowing high-speed pulsing operation without causing bias instability or excessive noise in the reception path.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If shielding assembly unit is added, then noise is reduced and reliability is improved, but device complexity increases

Engineering Contradiction:

Improvesignal qualityVSAvoidstructural complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines multiple shielding functions (electromagnetic interference shielding and light leakage blocking) into a single integrated shielding assembly unit. This merging approach reduces the number of separate components needed, thereby improving signal quality while minimizing the increase in device complexity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The shielding assembly unit performs multiple functions simultaneously: it shields electromagnetic interference from the laser diode, blocks light leakage between paths, and maintains structural alignment. This multi-functionality allows the patent to improve reliability without adding proportionally more components.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Object-affected harmful factors

If transmission and reception paths are separated, then light leakage is prevented, but manufacturing precision requirements increase

Engineering Contradiction:

Improvelight leakageVSAvoidalignment precision

Core Design Contradiction:

Object-affected harmful factorsVSManufacturing precision

Solution Approach 1:

The patent uses a shielding assembly unit that acts as a flexible barrier between the transmission and reception paths. This shielding structure can accommodate minor manufacturing variations while still effectively blocking light leakage, thereby preventing harmful light interference without requiring extremely tight manufacturing precision.

Inventive Principle:

Principle #30Flexible shells and thin films

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 solution effectively shields electromagnetic interference and light leakage, reducing noise and preventing unintended activation, thereby stabilizing the LIDAR sensor's operation and improving signal quality.

Implementation Method 1

a shielding assembly unit which is assembled between the first body tube and the second body tube and restricts the movement of the transmission light which passes through the first body tube to the second body tube

Methodology Applied

Scientific EffectElectromagnetic interference shielding: Faraday Cage

Implementation Method 2

a first shielding unit which is assembled to abut with one side of the first body tube and absorbs the transmission light emitted to the outside of the first body tube

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Implementation Method 3

a baffle system is used to cancel noise by restricting light movement within predetermined grooves

Methodology Applied

Scientific EffectLight path constraint: Physical Containment

Data Source

PatentUS20230100381A1Lidar sensor that cancels noise by shielding EMI and light leakage

Publication Date: 2023.03.30 YUJIN ROBOT

AI summary

The present exemplary embodiments propose a LIDAR sensor including: a transmission/reception module which transmits transmission light and receives reception light reflected from an object and includes a shielding assembly unit located between a path through which the transmission light moves and a path through which the reception light moves, a reflector assembly which has an empty space to assemble the transmission/reception module at one side, receives the transmission light from the transmission/reception module to reflect the transmission light toward the object and transmits the reception light reflected from the object to the transmission/reception module, a rotary module which rotates the transmission/reception module, and a fixing module which supports the transmission/reception module and the rotary module.