Rotatable Luminescent Substrate for Dynamic Color Control
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Solution Overview
Problem
Conventional projectors using high-intensity discharge lamps as light sources face limitations in controlling color light intensity, requiring multiple substrates with luminescent materials at different angles, which are cumbersome to replace and manage during operation.
Innovation Solution
A light source unit incorporating an excitation light source, an optical path switching device, a luminescent light emitting plate, and a light guiding optical system that switches and combines light paths in a time-sharing fashion to control color light emission, allowing for adjustable color intensity without substrate replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If substrates coated with luminescent materials at different angles are used to control color light intensity, then color intensity control is achieved, but device complexity and ease of operation deteriorate due to the need to replace multiple substrates
Solution Approach 1:
The patent applies the dynamics principle by making the substrate rotatable about its normal axis. This allows the substrate to dynamically change its orientation angle relative to the excitation light source, enabling continuous adjustment of color light intensity without replacing substrates. The rotational movement transforms a static system into a dynamic one, resolving the contradiction between intensity control and device complexity.
Solution Approach 2:
The substrate is segmented into multiple circumferential regions, each coated with luminescent materials at different angles. This segmentation allows different portions of the substrate to emit different colors when illuminated, enabling color intensity control through rotational positioning rather than substrate replacement.
2Manufacturing precision
If substrates with fixed luminescent material angles are used, then manufacturing precision is maintained, but adaptability deteriorates as angles cannot be changed during operation
Solution Approach 1:
By enabling the substrate to rotate about its normal axis, the system transforms from a static configuration with fixed angles to a dynamic system where the effective angle can be continuously adjusted during operation. This maintains the precision of the manufactured coating angles while adding operational adaptability.
Solution Approach 2:
The invention adds a rotational dimension to the substrate positioning. Instead of changing the fixed angular orientation in the plane of the substrate, the substrate rotates about its normal axis, introducing a new degree of freedom that enables angle adjustment without affecting the manufacturing precision of the luminescent material coating.
3Illumination intensity
If multiple substrates are replaced to control color variation, then color intensity control is achieved, but productivity and time efficiency deteriorate
Solution Approach 1:
The rotatable substrate eliminates the need for physical replacement operations. The continuous rotational adjustment allows operators to change color intensity settings instantly without the time-consuming process of removing one substrate and installing another, significantly improving operational efficiency.
Solution Approach 2:
The substrate can be rotated continuously or stepped to any desired angle position, providing uninterrupted color intensity control. This eliminates the discontinuous nature of substrate replacement, where the system must be stopped and reconfigured, thereby maintaining continuous productive operation.
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
Enables flexible control of color light intensity and improved color reproduction in projectors by dynamically switching and guiding light paths, reducing the need for multiple substrates and enhancing operational efficiency.
Implementation Method 1
a light emitting plate on which is formed a luminescent material layer which emits luminescent light of a wavelength band which is different from that of the excitation light when receiving the second light
Data Source
AI summary
A light source unit is provided which includes a first light source which shines excitation light of a predetermined wavelength band; an optical path switching device which switches in a time-sharing fashion the light shone from the first light source into first light which is shone in a first direction and second light which is shone in a second direction; a light emitting plate on which a luminescent material layer is formed which emits luminescent light of a wavelength band which is different from that of the excitation light when receiving the second light; and a light guiding optical system which guides the first light and the luminescent light to the same optical path.