Light Source Device Uniform Wavelength Conversion via Optical Element
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Solution Overview
Problem
Existing light source devices with wavelength conversion members experience partial temperature rises due to concentrated heat generation, leading to decreased efficiency and altered optical characteristics of illumination light.
Innovation Solution
A light source device design that includes an excitation light source, a light guide, and a wavelength conversion unit with an optical element and a wavelength conversion member, where the optical element reflects or diffracts excitation light to irradiate the wavelength conversion member uniformly, preventing partial heat generation and maintaining desired optical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the light guide emission end face is in direct contact with the wavelength conversion member, then the structure is simple and easy to manufacture, but the irradiation region is concentrated causing partial heat generation and temperature rise
Solution Approach 1:
A resin layer is introduced as an intermediary substance between the light guide emission end face and the wavelength conversion member. This resin layer has high light transmittance and serves as a medium to distribute the excitation light over a wider area of the wavelength conversion member, preventing concentrated heat generation while maintaining structural simplicity and ease of manufacture.
2Device complexity
If the irradiation region is concentrated in a portion of the wavelength conversion member, then the light guide structure is simple, but the heat generation is concentrated causing efficiency decline and spectral changes
Solution Approach 1:
The resin layer acts as a light-distributing intermediary that spreads the excitation light from the light guide over a broader area of the wavelength conversion member. This prevents concentrated irradiation and heat generation, maintaining high wavelength conversion efficiency and stable spectral characteristics without complicating the light guide structure.
3Volume of moving object
If excitation light is concentrated in a small region, then the light guide can be simple and compact, but the brightness and color of illumination light become unstable
Solution Approach 1:
The resin layer with high light transmittance serves as a light-distributing intermediary that spreads excitation light uniformly across the wavelength conversion member. This ensures stable brightness and color of the illumination light while maintaining a compact device structure, as the light guide itself remains simple and small.
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 distributes heat generation across the wavelength conversion member, maintaining efficiency and optical quality of the illumination light, preventing partial temperature rises and ensuring consistent brightness and color.
Implementation Method 1
an optical element disposed on an optical axis as a center axis of the excitation light emitted from the light guide emission end face and with which the excitation light emitted from the light guide emission end face is irradiated to reflect, scatter, or diffract the excitation light
Implementation Method 2
an optical element disposed on an optical axis as a center axis of the excitation light emitted from the light guide emission end face and with which the excitation light emitted from the light guide emission end face is irradiated to reflect, scatter, or diffract the excitation light
Implementation Method 3
an optical element disposed on an optical axis as a center axis of the excitation light emitted from the light guide emission end face and with which the excitation light emitted from the light guide emission end face is irradiated to reflect, scatter, or diffract the excitation light
Implementation Method 4
the wavelength conversion member absorbs the excitation light and converts the wavelength of the absorbed excitation light to emit the light as illumination light
Implementation Method 5
a light guide member including a light guide incidence end face through which the excitation light emitted from the excitation light source incidents and a light guide emission end face from which the excitation light is emitted, and guiding the excitation light from the light guide incidence end face to the light guide emission end face
Data Source
AI summary
A light source device includes an excitation light source, a light guide member and a wavelength conversion unit. The wavelength conversion unit includes an optical element disposed on an optical axis and with which excitation light emitted from the light guide member is irradiated to reflect, scatter, or diffract the excitation light, a wavelength conversion member disposed on an optical path of the excitation light reflected, scattered, or diffracted by the optical element to convert the excitation light into wavelength converted light and an emission opening portion that emits the wavelength converted light converted by the wavelength conversion member.