Wavelength Conversion Member with Divisional Fluorescent Members
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Solution Overview
Problem
Conventional illumination apparatuses with multiple fluorescent members suffer from re-absorption issues, leading to uneven light intensity distribution and color balance variations due to the angular intensity characteristics of light sources, which complicates the setting of color balance in white light sources.
Innovation Solution
An illumination apparatus featuring a wavelength conversion member with multiple fluorescent members arranged in divisional regions, where the circumferential area ratio of each member is constant, and interfaces are designed to minimize re-absorption, ensuring equal irradiation intensity and efficient light conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple fluorescent members are arranged along the optical path direction, then light conversion efficiency is improved, but re-absorption of emitted light occurs causing uneven light intensity distribution
Solution Approach 1:
The patent transitions from arranging fluorescent members along the optical path direction (one dimension) to arranging them in the lateral direction perpendicular to the optical path (another dimension). This dimensional change eliminates re-absorption issues while maintaining high light conversion efficiency, as emitted light from one fluorescent member no longer passes through other fluorescent members.
Solution Approach 2:
The patent divides the wavelength conversion member into multiple divisional regions, each containing different types of fluorescent members. This segmentation allows each fluorescent member to be irradiated uniformly by excitation light from the light source, preventing re-absorption and ensuring even light intensity distribution across all fluorescent members.
2Illumination intensity
If fluorescent members are disposed at different positions relative to the light source, then light emission intensity varies, but color balance becomes difficult to control
Solution Approach 1:
The patent creates equipotential conditions for all fluorescent members by arranging them in divisional regions along the lateral direction, ensuring that each fluorescent member receives approximately equal excitation light intensity from the light source. This eliminates position-dependent intensity variations and makes color balance control straightforward, as color balance now directly reflects the proportional arrangement of different fluorescent members.
3Device complexity
If conventional arrangements of fluorescent members are used, then device structure is simple, but color balance varies with light intensity changes
Solution Approach 1:
By arranging fluorescent members in the lateral direction perpendicular to the optical path rather than along the optical path, the patent achieves a simple yet effective structure that ensures uniform excitation light distribution. This arrangement makes the color balance stable and independent of light intensity variations, as all fluorescent members operate under equivalent excitation conditions.
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 design allows for stable and easy adjustment of color balance, providing illumination light with consistent intensity and color mixture, reducing color variation and enhancing light emission efficiency.
Implementation Method 1
a plurality of fluorescent members which absorb the excitation light and emit fluorescent light having a peak wavelength different from the peak wavelength of the excitation light
Data Source
AI summary
The wavelength conversion member includes a plurality of fluorescent members that absorb the excitation light and emit fluorescent light having a peak wavelength different from the peak wavelength of the excitation light. The wavelength conversion member has a surface irradiated with excitation light that faces an excitation light emitting surface of the excitation light source. The optical axis passes the center of the surface irradiated with excitation light. The plurality of fluorescent members are arranged in a divisional manner at such proportions that a circumferential area ratio, which is defined as the ratio of area occupied by each of the fluorescent members in a concentric annular region having a center located at the center of the surface irradiated with excitation light on the surface irradiated with excitation light of the wavelength conversion member, is substantially constant irrespective of the radius of the concentric annular region.