Vehicle Headlight Flexible Light Guide Vibration Stability

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Solution Overview

Problem

Conventional illumination devices face instability in projecting excitation light due to movable components, leading to unsustained light distribution, especially under vibrations, as the optical members can displace individually, disrupting the alignment and path of excitation light to the fluorescent material.

Innovation Solution

The implementation of a flexible first light guide section and a fixed second light guide section with a light guide path, where the emitting end of the first section is positioned near the receiving end of the second section, ensuring stable emission light projection and distribution, even under vibrations, while allowing for heat dispersion and flexible light source placement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional rigid optical members (lens and reflector) are used to guide excitation light, then light guidance function is achieved, but the system becomes unstable under vibration as components can displace individually

Engineering Contradiction:

Improvestability of light projectionVSAvoidnumber of separate optical components

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines multiple optical functions (light guidance, reflection, and positioning) into a single flexible light guide member. This member integrates the functions of what would traditionally require separate lenses and reflectors, eliminating individual component displacement issues while maintaining stable light projection to the fluorescent material.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent employs a flexible light guide member that can be positioned and fixed close to the light source emission point. This flexibility allows the member to adapt to spatial constraints while its fixed positioning ensures stable light guidance even under vibration, resolving the contradiction between reliability and structural simplicity.

Inventive Principle:

Principle #30Flexible shells and thin films

2Temperature

If rigid light guide sections are used, then structural stability is achieved, but thermal isolation between light source and conversion section is insufficient

Engineering Contradiction:

Improvethermal isolationVSAvoidstructural stability

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

The flexible light guide member acts as both a structural and thermal solution. Its flexibility allows it to be positioned away from the light source while maintaining stable light guidance, creating thermal isolation. Simultaneously, once positioned, it provides the structural stability needed for reliable operation, thus resolving the contradiction between thermal management and structural integrity.

Inventive Principle:

Principle #30Flexible shells and thin films

3Reliability

If multiple separate optical components are used, then light distribution control is achieved, but alignment stability deteriorates under vibration

Engineering Contradiction:

Improvealignment stabilityVSAvoidlight distribution control

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent merges light guidance and distribution control into a single flexible light guide member with an integrated light guide path. This path is designed to control light distribution while the entire member's fixed positioning ensures alignment stability, eliminating the problem of relative displacement between separate optical components under vibration.

Inventive Principle:

Principle #5Merging (Combining)

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

This configuration ensures stable projection and distribution of emission light, reduces light loss, and allows for thermal isolation of the light source and conversion section, enhancing the reliability and efficiency of the illumination device.

Implementation Method 1

a first light guide section and a second light guide section, which guide emission light emitted from a light source

Methodology Applied

Scientific EffectTotal internal reflection: Total Internal Reflection

Implementation Method 2

an excitation light source generates excitation light which is then projected to a light emitting section containing a fluorescent material so that the material can emit illumination light

Methodology Applied

Scientific EffectFluorescence: Fluorescence

Data Source

PatentUS8864328B2Illumination device and vehicle headlight

Publication Date: 2014.10.21 SHARP FUKUYAMA LASER CO LTD

AI summary

In a head lamp 1, relative positions of a laser light guide path in a tapered light guide section 20 and a parabolic mirror 5 are fixed. An optical fiber 10 and the tapered light guide section 20 are each provided so as to have a receiving end part where laser light is received and an emitting end part where laser light is emitted. The emitting end part of the optical fiber 10 is located near the receiving end part of the tapered light guide section 20.