Electrodeless Lamp Light Source with Waveguide and Converging Means
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Solution Overview
Problem
Conventional light source devices with electrodeless lamps have low light condensing efficiency due to a wide projection angle, leading to inefficient use of light and larger projector sizes, as they utilize a wide angular range of light, resulting in unsatisfactory coupling efficiency and increased size requirements for light condensing systems.
Innovation Solution
A light source device comprising a waveguide, electrodeless lamp, and converging means, such as a spherical reflecting mirror, to converge light emitted from the electrodeless lamp, reducing the 'etendue' and enhancing coupling efficiency, allowing for a more compact and efficient light condensing system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the electrodeless lamp emits light with a wide projection angle, then the light distribution is more uniform (Lambertian diffuse surface), but the light condensing efficiency becomes low and the device size increases
Solution Approach 1:
The inner wall of the electrodeless lamp is segmented into multiple reflective surfaces with different orientations. Each segment reflects light in a specific direction, collectively forming a controlled beam pattern that redirects wide-angle light into a narrower, more condensable angular range without sacrificing overall uniformity
Solution Approach 2:
Different regions of the lamp's inner wall are given different reflective properties. The irregular reflection surface is strategically designed with varying local qualities - some areas provide diffuse reflection for uniformity while others provide directional reflection for beam control, optimizing both uniformity and condensing efficiency in different spatial zones
2Area of stationary object
If the electrodeless lamp emits light with a wide projection angle, then the light covers a broader area, but the coupling efficiency with the light condensing system becomes unsatisfactory
Solution Approach 1:
The reflective surfaces within the electrodeless lamp are arranged in three-dimensional configurations that redirect light from a wide two-dimensional angular distribution into a more focused conical beam. This dimensional transformation of the light distribution pattern improves coupling with the condensing system while preserving broad area coverage through strategic positioning of reflective elements
3Adaptability or versatility
If a conventional light condensing system is used with wide-angle light, then the system can handle the broad light distribution, but the projector size becomes large
Solution Approach 1:
The electrodeless lamp incorporates built-in reflective surfaces that pre-condition the light distribution before it enters the condensing system. By performing preliminary beam shaping and angular control within the lamp structure itself, the subsequent condensing system requires fewer components and smaller dimensions to achieve the same effectiveness, reducing overall projector size
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 significantly improves light condensing efficiency by reducing the etendue, enabling a more compact and lightweight image displaying apparatus with higher luminance, contrast, and longer operation life, while allowing for flexible adjustment of the light radiation angle.
Implementation Method 1
The probe receives high-frequency power from a high-frequency power supply. When the high-frequency power is supplied to the probe, the waveguide generates microwaves therein
Implementation Method 2
the waveguide generates microwaves therein and is resonated with the use of the dielectric material as medium
Implementation Method 3
Plasma is generated in the electrodeless lamp due to the microwaves generated in the aperture cavity, whereby light is emitted
Implementation Method 4
a spherical reflecting mirror disposed on the surface of the waveguide to enclose the aperture cavity, the spherical reflecting mirror having a semi-spherical reflecting surface
Data Source
AI summary
A light source device comprises a waveguide, an electrodeless lamp, a probe, and conversing means. The waveguide is formed to contain a medium enabling a microwave to resonate and has a surface and an aperture cavity with an aperture opened at a predetermined position of the surface. The electrodeless lamp is loaded in the aperture cavity in a state where part of the electrodeless lamp is protruded from the surface of the waveguide so that the part of the electrode lamp emits light in response to applying the microwave to the electrodeless lamp. The probe supplies a high-frequency signal to the waveguide so that the high-frequency signal is converted to the microwave in the waveguide. The converging means is disposed on the surface of the waveguide to face the aperture cavity and utilizes all the light emitted from the part of the electrodeless lamp to converge the light.