Laser Source With Combining Lens Groups Without Phosphor Wheels
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Solution Overview
Problem
Existing laser projection technologies face challenges in efficiently combining laser beams of multiple colors and achieving compact, cost-effective designs without the need for phosphor wheels, which can complicate the structure and increase volume.
Innovation Solution
A laser source with a housing containing multiple laser arrays and a beam path assembly, where each laser array emits multiple colored laser beams, combined by corresponding combining lens groups, and optionally using wave plates to alter polarization, all within a compact and efficient design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If phosphor wheels are used to combine laser beams of multiple colors, then color mixing is achieved, but the structure becomes complicated and volume increases
Solution Approach 1:
The patent extracts and eliminates the phosphor wheel component from the laser projection system. Instead of using a phosphor wheel to convert laser light to multiple colors, the invention directly uses multiple laser arrays (blue, green, red) that can be independently controlled to achieve color mixing, thereby simplifying the overall structure while maintaining color capability
Solution Approach 2:
The patent makes the laser arrays multi-functional by enabling them to perform both illumination and color generation functions simultaneously. The blue, green, and red laser arrays can be independently modulated to create various colors and white light, eliminating the need for separate color conversion mechanisms like phosphor wheels
2Volume of stationary object
If phosphor wheels are used to combine laser beams, then color conversion is achieved, but volume increases
Solution Approach 1:
The patent removes the phosphor wheel component which occupies significant volume in traditional laser projection systems. By directly combining multiple laser arrays with different colors, the system achieves color mixing without the need for bulky color conversion mechanisms, thereby reducing the overall volume of the laser source
Solution Approach 2:
The patent merges the functions of multiple laser arrays (blue, green, red) into a single integrated laser source structure. The combining lens groups merge the beams from different laser arrays directly, eliminating the need for separate color conversion stages and reducing the overall system volume
3Adaptability or versatility
If multiple laser arrays are used to emit multiple colors, then color variety is improved, but beam combination complexity increases
Solution Approach 1:
The patent introduces combining lens groups as intermediary optical elements between the multiple laser arrays and the projection path. These lens groups are designed to specifically combine beams of different colors (blue, green, red) through optical interference and focusing, simplifying the beam combination process while maintaining color variety
Solution Approach 2:
The patent applies local quality optimization by designing specific combining lens groups for different color combinations. Each lens group is optimized to handle specific wavelength ranges and beam characteristics, making the beam combination process more manageable and less complex while maintaining high color variety
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 enables efficient combination of multiple colored laser beams without phosphor wheels, reducing volume and complexity while maintaining high luminance and monochromaticity, thus enhancing the performance and compactness of laser projection apparatuses.
Implementation Method 1
The beam path assembly includes a plurality of combining lens groups. The plurality of combining lens groups and the plurality of laser arrays are in one-to-one correspondence. A combining lens group of the plurality of combining lens groups is configured to combine laser beams of multiple colors emitted by a laser array corresponding to the combining lens group
Implementation Method 2
The laser beams of the multiple colors emitted by the plurality of laser-exit regions are linearly polarized lights. Polarization directions of the laser beams of the multiple colors emitted by the plurality of laser-exit regions are different. A wave plate is disposed between the combining lens group and a laser-exit region of the laser array corresponding to the combining lens group. The wave plate is configured to change a polarization direction of a laser beam emitted by the laser-exit region
Data Source
AI summary
A laser source includes a laser source housing, laser arrays and a beam path assembly. The laser source housing includes beam outlet and accommodating openings disposed at a same side wall or different side walls of the laser source housing. The laser arrays are respectively disposed in the accommodating openings. A laser array is configured to emit laser beams into the laser source housing. A laser-exit surface of the laser array includes a plurality of laser-exit regions configured to emit laser beams of multiple colors. The beam path assembly including a plurality of combining lens groups is disposed inside the laser source housing. The combining lens groups and the laser arrays are in one-to-one correspondence. A combining lens group is configured to combine laser beams of multiple colors emitted by a corresponding laser array, and combined laser beams are not located in beam output paths of other combining lens groups.