Laser Projector Dichroic Mirror Beam Combining
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Solution Overview
Problem
Laser projectors require numerous optical components for beam combining, increasing hardware, weight, and volume, which is inefficient and power-intensive due to the use of blue laser sources and wavelength conversion devices.
Innovation Solution
A laser projector design utilizing a laser light source, dichroic mirrors, light valves, and a beam combining module to generate and combine polarized red, green, and blue beams, reducing the need for additional polarization conversion components and optimizing energy usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a light splitter and color wheel are used for beam combining, then wavelength conversion can be achieved, but the number of optical components increases greatly
Solution Approach 1:
The patent extracts and eliminates unnecessary optical components from the traditional beam combining system. By removing the light splitter and replacing the color wheel with direct laser diodes of different wavelengths, the system achieves wavelength conversion capability while dramatically reducing the number of optical components.
Solution Approach 2:
The patent merges multiple functions into fewer components. The direct laser diodes simultaneously provide wavelength conversion and beam generation functions that were previously separated into multiple components (light splitter, color wheel, multiple reflectors). This consolidation reduces system complexity while maintaining functionality.
2Ease of operation
If multiple reflectors and a color wheel are used, then beam combining is achieved, but the weight and volume of the beam combining module increase
Solution Approach 1:
The patent removes unnecessary components (light splitter, color wheel, multiple reflectors) that contribute to weight. The simplified design using direct laser diodes and minimal optics achieves beam combining while significantly reducing the weight of the beam combining module.
3Ease of manufacture
If a light splitter and multiple reflectors are used for beam combining, then color beam generation is achieved, but the volume of the beam combining module increases
Solution Approach 1:
The patent merges the functions of multiple reflectors, light splitter, and color wheel into a compact arrangement of direct laser diodes and minimal optical components. This consolidation achieves color beam generation while dramatically reducing the volume of the beam combining module.
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 minimizes unnecessary optical components, enhances power efficiency, and produces more saturated images with concentrated illumination energy, resulting in a compact and efficient projector.
Implementation Method 1
a laser light source, configured to generate a composite polarized beam
Implementation Method 2
The first dichroic mirror is configured to receive the composite polarized beam, and separate the composite polarized beam into a first color beam and a relay beam
Implementation Method 3
The second dichroic mirror is configured to receive the relay beam, and separate the relay beam into a second color beam and a third color beam
Implementation Method 4
The three light valves are configured to receive the first, second and third color beams and modulate the first color beam into a first light beam, the second color beam into a second light beam, and the third color beam into a third light beam
Implementation Method 5
The beam combining module is configured to combine the first light beam, the second light beam and the third light beam to form a multi-color image
Data Source
AI summary
A laser projector includes a laser light source, a first dichroic mirror, a second dichroic mirror, three light valves and a beam combining module. The laser light source is used to generate a composite polarized beam. The first dichroic mirror is used to receive the composite polarized beam, and separate the composite polarized beam into a first color beam and a relay beam. The second dichroic mirror is used to receive the relay beam, and separate the relay beam into a second color beam and a third color beam. The three light valves are used to modulate the three color beams into three light beams. The beam combining module is used to combine the three light beams to form a multi-color image.