Rotating Light Collector Layout for Phosphor Heat Distribution
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing light source apparatuses for projectors face issues with heat buildup at specific locations due to continuous excitation light incidence on phosphor layers, leading to reduced efficiency in wavelength conversion, and motion-based solutions like light collection system reciprocation fail to effectively distribute light without residual incidence.
Innovation Solution
A wavelength conversion apparatus with a light collector and a rotatable holding part supported by a separate and parallel axis, allowing continuous rotation to distribute excitation light evenly across a wavelength converter, coupled with a heat dissipation system to manage thermal issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If excitation light continuously illuminates the same location at the phosphor layer, then the light source apparatus can maintain a simple structure, but the phosphor layer temperature rises and conversion efficiency decreases
Solution Approach 1:
The patent applies the dynamics principle by making the light collector rotatable around an axis, transforming it from a static component to a dynamic one. This rotation enables the light collector to continuously change the incident position on the phosphor layer, distributing the excitation light over a larger area and preventing localized overheating, thereby maintaining high conversion efficiency without complicating the overall structure.
Solution Approach 2:
The patent implements periodic action through the rotational movement of the light collector. By rotating the light collector at a predetermined speed, the incident position on the phosphor layer periodically changes, ensuring that no single location receives continuous excitation light. This periodic redistribution of light energy prevents temperature buildup and maintains efficient wavelength conversion.
2Temperature
If a light collection system moves reciprocatingly to change the incident position, then excitation light distribution improves, but the movement speed becomes zero at direction change timing causing residual incidence on the same location
Solution Approach 1:
The patent replaces the reciprocating motion with continuous rotational motion. The light collector rotates around an axis parallel to the optical axis, maintaining constant movement without stopping. This eliminates the zero-speed pause problem inherent in reciprocating systems, ensuring that the incident position on the phosphor layer continuously changes without residual incidence on any single location.
Solution Approach 2:
The patent inverts the approach by rotating the light collector around an axis parallel to the optical axis rather than moving it back and forth perpendicular to the optical axis. This fundamental change in motion geometry transforms the problematic reciprocating action into smooth continuous rotation, eliminating the direction-change pause that causes residual light incidence.
3Device complexity
If the optical axis of the light collector and the rotation axis are coincident, then the structure is simpler, but the light distribution effect is reduced
Solution Approach 1:
The patent applies asymmetry by deliberately positioning the rotation axis parallel to but separate from the optical axis of the light collector. This asymmetric arrangement creates an offset that enhances the light distribution effect, as the rotation causes the incident position to trace a circular path on the phosphor layer rather than remaining on-axis, improving thermal management and conversion efficiency.
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 maintains efficient wavelength conversion by evenly distributing excitation light and effectively dissipates heat, enhancing the overall performance and longevity of the light source apparatus.
Implementation Method 1
a wavelength converter 41 that converts first light BLs incident from a light source 21 and belonging to a first wavelength band into second light YL belonging to a second wavelength band different from the first wavelength band
Implementation Method 2
a light collector 40 that causes the first light BLs to enter the wavelength converter 41
Implementation Method 3
a rotary driver 45 that rotates the holding part 44 around an axis of rotation R
Implementation Method 4
a support part 46 that is fixed to the base 202 and rotatably supports the holding part 44
Data Source
AI summary
A wavelength conversion apparatus according to an aspect of the present disclosure includes a wavelength converter that converts first light emitted from a light source and having a first wavelength band into second light having a second wavelength band different from the first wavelength band, a base to which the wavelength converter is fixed, a light collector that causes the first light emitted from the light source to enter the wavelength converter, a holding part that holds the light collector, a rotary driver that rotates the holding part around an axis of rotation, and a support part that is fixed to the base and rotatably supports the holding part, the optical axis of the light collector is separated from the axis of rotation of the holding part, the optical axis of rotation of the holding part is parallel to the axis of rotation of the holding part.