Projection Lighting Layout Using Beam Splitting to Cut Light Loss
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Solution Overview
Problem
Conventional projection devices suffer from energy loss due to overlapping wavelengths of supplementary light and excited light, leading to inefficient utilization of light sources.
Innovation Solution
A lighting system comprising a first light source module, a second light source module, a beam splitting element, a light condensing element, and a light homogenizing element, which guides light beams along separate paths to avoid energy loss caused by dichroic mirrors, enhancing light emission efficiency and optical effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If dichroic mirrors are used to separate wavelengths in the conventional lighting system, then the supplementary light (red and green) can be reflected toward the light integration rod, but the excited light energy is lost by 20% to 30% due to wavelength overlap
Solution Approach 1:
The patent divides the lighting system into two independent light source modules: a first light source module providing supplementary light and a second light source module providing excited light. Each module has its own optical path, avoiding the need for dichroic mirrors to separate overlapping wavelengths. The beam splitting element separates the two distinct light paths without causing energy loss, as each module operates independently with non-overlapping optical paths.
2Loss of energy
If the transmittance of the dichroic mirror is changed to allow more excited light through, then energy loss is reduced, but the supplementary light cannot effectively pass through the mirror
Solution Approach 1:
The patent segments the lighting system into two independent modules with separate optical paths. The first light source module generates supplementary light that passes through the beam splitting element's transparent side, while the second light source module generates excited light that passes through the beam splitting element's reflective side. This segmentation eliminates the need to adjust dichroic mirror transmittance, as each module operates independently without wavelength interference.
Solution Approach 2:
The beam splitting element acts as an intermediary that directs light from two different sources along separate paths. It has a first side that is transparent to supplementary light and a second side that reflects excited light, allowing both types of light to be utilized effectively without the energy loss problems associated with conventional dichroic mirrors.
3Device complexity
If conventional dichroic mirror design is adopted, then the lighting system structure is simplified, but both supplementary light and excited light cannot be effectively utilized simultaneously
Solution Approach 1:
The patent divides the lighting system into two independent light source modules, each with its own optical path. The first module provides supplementary light through the transparent side of the beam splitting element, while the second module provides excited light through the reflective side. This segmentation allows both light sources to be effectively utilized simultaneously without the limitations of conventional dichroic mirror designs.
Solution Approach 2:
The beam splitting element serves multiple functions: it acts as a beam splitter to separate the two light paths, a wavelength separator to direct different types of light to appropriate paths, and a light guide to ensure both supplementary and excited light reach the light integration rod efficiently. This multi-functionality achieves high light source utilization without significantly increasing system complexity.
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 system improves light emission efficiency and optical effects by avoiding energy loss, allowing for better utilization of light sources and improved projection image quality.
Implementation Method 1
The beam splitting element is a partially transmissive and partially reflecting element and has a first side and a second side opposite to each other. The beam splitting element is used to guide a first portion of the first light beam to be output from the first side and transmitted along a first light path, and to guide a second portion of the first light beam to be output from the second side and transmitted along a second light path
Implementation Method 2
The wavelength conversion element is disposed on a transmission path of the excitation light beam, and is used to convert the excitation light beam into an excited light beam
Implementation Method 3
The light condensing element includes a central axis, and a first portion and a second portion located on both sides of the central axis. The first portion of the light condensing element is located on the first light path between the beam splitting element and the light homogenizing element. The second portion of the light condensing element is located on the second light path between the beam splitting element and the light homogenizing element
Implementation Method 4
The light homogenizing element is used to output the lighting beam
Data Source
AI summary
A lighting system includes a first light source module providing a first light beam, a second light source module providing a second light beam, a beam splitting element with a first and a second side, a light condensing element, and a light homogenizing element. The beam splitting element guides the first portion of the first light beam to be output from the first side to be incident on the light homogenizing element and guides the second portion of the first light beam to be output from the second side to be incident on the light homogenizing element. The beam splitting element guides the first portion of the second light beam to be output from the first side to be incident on the light homogenizing element and guides the second portion of the second light beam to be output from the second side to be incident on the light homogenizing element.