Fluorescent Wheel Light Source Device for Projector Color Purity
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Solution Overview
Problem
Conventional light source devices for projectors, which use a fluorescent wheel with a special reflective layer for specific wavelength bands, are complex and costly to manufacture, and suffer from color purity issues due to shared optical paths for excitation and emission of blue, red, and green wavelength lights.
Innovation Solution
A light source device with a fluorescent wheel formed as a reflective plate, incorporating transmissive portions to separate the emission paths of source light and fluorescent light of each color, utilizing dichroic mirrors and reflective mirrors to condense and direct these lights onto the same optical path, eliminating the need for special reflective layers and simplifying the configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a special reflective layer is formed on the fluorescent wheel surface to reflect specific wavelength bands, then the color purity is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent removes the special reflective layer from the fluorescent wheel surface, extracting the problematic component that caused complexity and manufacturing difficulties. Instead of forming wavelength-selective reflective layers, the invention uses the natural reflective properties of the metal plate substrate to achieve the desired optical separation.
Solution Approach 2:
Rather than adding a reflective layer to control light reflection, the invention inverts the approach by using the inherently reflective metal plate substrate and creating transmissive portions where light should pass through. This reversal eliminates the need for complex wavelength-selective coatings while maintaining optical performance.
2Manufacturing precision
If a special reflective layer is formed on the fluorescent wheel surface to reflect specific wavelength bands, then the color purity is improved, but the ease of manufacture deteriorates
Solution Approach 1:
The patent removes the special reflective layer from the fluorescent wheel surface, extracting the problematic component that caused complexity and manufacturing difficulties. Instead of forming wavelength-selective reflective layers, the invention uses the natural reflective properties of the metal plate substrate to achieve the desired optical separation.
Solution Approach 2:
The invention replaces expensive, complex wavelength-selective reflective coatings with simple transmissive portions in the metal plate substrate. This substitution uses cheaper, easier-to-manufacture components while achieving the same functional result of optical path separation.
3Device complexity
If the optical paths of red, green and blue wavelength lights are made to be one and the same, then the device complexity is reduced, but the color purity deteriorates due to mixing of source light and fluorescent light
Solution Approach 1:
The patent segments the fluorescent wheel into reflective portions and transmissive portions. The transmissive portions are strategically positioned to allow source light to pass through while blocking fluorescent light, thereby separating the optical paths of source and fluorescent lights without requiring complex additional components.
Solution Approach 2:
Different portions of the fluorescent wheel are given different optical properties: reflective portions reflect fluorescent light while transmissive portions transmit source light. This local differentiation of optical properties enables optical path separation within a single integrated component, maintaining simplicity while ensuring color purity.
4Device complexity
If the incidence surface and emission surface of blue wavelength light are made to be one and the same, then the device complexity is reduced, but special configuration is required to separate the optical paths
Solution Approach 1:
The fluorescent wheel is segmented into reflective and transmissive portions, with transmissive portions positioned to create natural optical path separation. This segmentation allows the same surface to serve both as incidence and emission surface for blue light while automatically separating the optical paths through the differential reflective/transmissive properties of different wheel portions.
Solution Approach 2:
The fluorescent wheel serves multiple functions simultaneously: it acts as both the light-emitting component and the optical path separator. The transmissive portions enable the wheel to differentiate between source light and fluorescent light paths without requiring separate components, achieving multi-functionality within a single element.
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 allows for a simpler, cost-effective light source device that maintains high color purity by separating the optical paths of source and fluorescent lights, enhancing manufacturing ease and projector performance.
Implementation Method 1
a fluorescent substance layer which receives the excitation light and emits light of a predetermined wavelength band in response to the received excitation light
Implementation Method 2
a dichroic mirror which transmits the excitation light and reflects fluorescent light from fluorescent substances
Implementation Method 3
a plurality of reflective mirrors or dichroic mirrors which can condense the excitation light transmitted by the transmissive portion and the fluorescent light reflected by the dichroic mirror on one and the same optical path
Data Source
AI summary
A light source device includes: a light emitting plate that has a plurality of segment regions including a transmissive portion that transmits light and a reflective portion on which a fluorescent substance layer; a light source that irradiates the fluorescent substance layer of the light emitting plate with the excitation light; a dichroic mirror that is disposed between the light source and the light emitting plate to transmit the excitation light and reflect fluorescent light from fluorescent substances of the fluorescent substance layer; and an optical device that condenses the excitation light transmitted by the transmissive portion of the light emitting plate and the fluorescent light reflected by the dichroic mirror on a single optical path to form a condensed light and radiate the condensed light toward the same direction.