Vehicular Light Source Unit for External-Light Scattering Control

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Solution Overview

Problem

Existing vehicle lamps using inorganic light emitting layers suffer from issues with external light scattering, leading to unsightly appearances and require compact part arrangements.

Innovation Solution

A vehicle lamp design incorporating a light source unit with a reflective or absorbing portion between the light emitting layer and lens member, using inorganic materials and metal vapor deposition films to manage light reflection and absorption, enhancing appearance and compactness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If an inorganic material is used as the light emitting layer, then the light source can be turned off completely, but external light passes through the lens member, reaches the light emitting layer, and is scattered by the particles, causing the light emitting surface to appear present from outside, requiring improvement in appearance

Engineering Contradiction:

Improvelight source off stateVSAvoidappearance quality

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

A light absorbing portion is introduced as an intermediary element between the light emitting layer and the lens member. This light absorbing portion absorbs scattered light from the inorganic light emitting layer, preventing it from reaching the lens member and appearing as visible light emission. This mediator resolves the contradiction by maintaining the complete off state of the light source while eliminating the appearance issue caused by external light scattering.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If a light absorbing portion is added to absorb scattered light, then appearance quality improves, but the device structure becomes more complex

Engineering Contradiction:

Improveappearance qualityVSAvoidstructure complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The light absorbing portion is merged with the holding member that supports the light emitting layer. The holding member is configured to hold the light emitting layer while also functioning as the light absorbing portion. This integration reduces the number of separate components and simplifies the overall structure, resolving the contradiction between improving appearance quality and reducing device complexity.

Inventive Principle:

Principle #5Merging (Combining)

3Volume of moving object

If each part including light source, reflector, light emitting layer, lens member is arranged compactly, then space utilization improves, but manufacturing and assembly become more difficult

Engineering Contradiction:

Improvespace utilizationVSAvoidassembly difficulty

Core Design Contradiction:

Volume of moving objectVSEase of manufacture

Solution Approach 1:

The holding member is designed to perform multiple functions: it holds the light emitting layer in place, acts as the light absorbing portion to absorb scattered light, and provides structural support for the compact arrangement. This multi-functionality allows for compact space utilization while maintaining ease of manufacture and assembly, as a single component achieves what would otherwise require multiple separate parts.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 design provides a vehicle lamp with a good appearance and allows for compact part arrangement by minimizing external light scattering and excitation light leakage.

Implementation Method 1

a reflective portion that is disposed between the light emitting layer and the lens member, is capable of reflecting a part of light from outside of the lens member, and is capable of transmitting the generated light generated in the light emitting layer

Methodology Applied

Scientific EffectReflection: Reflection

Implementation Method 2

a light emitting layer that is constituted by using an inorganic material, and emits generated light by irradiation of the excitation light

Methodology Applied

Scientific EffectPhotoluminescence: Photoluminescence

Implementation Method 3

a light absorbing portion that is disposed between the light emitting layer and the lens member, and absorbs a part of a wavelength component among light from outside of the lens member being associated with the generated light

Methodology Applied

Scientific EffectAbsorption (EM radiation): Absorption (EM radiation)

Data Source

PatentUS12455059B2Light source unit for vehicular lighting tool and vehicular lighting tool

Publication Date: 2025.10.28 ICHIKOH IND LTD

AI summary

A light source unit for a vehicle lamp includes a light generating portion including a light source that emits excitation light, a light emitting layer constituted of an inorganic material and emitting generated light by irradiation of the excitation light, and a holding member that holds the layer; and a lens member that irradiates the generated light from the layer in a front direction in a vehicle-mounted state. The unit further includes a reflective portion disposed between the layer and the lens member, capable of reflecting a part of light from outside of the lens member, and capable of transmitting the generated light generated in the layer; or a light absorbing portion disposed between the layer and the lens member, and absorbing a part of a wavelength component among light from outside of the lens member being associated with the generated light.