Laser Source Assembly for RGB Beam Spot Coincidence
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Solution Overview
Problem
Existing laser projection technologies face challenges in efficiently combining and aligning laser beams of different colors, leading to issues such as poor beam spot coincidence and increased beam loss, which are not conducive to miniaturization and efficient projection.
Innovation Solution
A laser source assembly with a combining lens group that includes a beam expanding component to increase the divergence angles of certain laser beams before combination, along with a diffusion component to homogenize illumination beams, and a digital micromirror device to modulate the beams for projection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If laser beams of different colors are combined without beam expansion, then the device structure is simpler, but beam spot coincidence is poor and beam loss increases
Solution Approach 1:
The beam expanding component performs preliminary expansion of the beam diameter before the beams enter the combining lens group. This preliminary action ensures that beams of different colors have matched beam diameters and divergence angles at the point of combination, achieving good beam spot coincidence without requiring complex post-adjustment mechanisms.
Solution Approach 2:
The invention changes the physical parameters of the laser beams by introducing a beam expanding component that increases the beam diameter and adjusts the divergence angle. This parameter change allows beams of different colors to have consistent optical parameters before combination, resolving the beam spot coincidence issue while maintaining a relatively simple device structure.
2Loss of energy
If beam diameter is not expanded before combination, then the optical path is shorter, but beam spot coincidence deteriorates and beam loss increases
Solution Approach 1:
The beam expanding component is positioned to perform preliminary beam expansion before the beams enter the combining lens group. This ensures that beams of different colors have matched diameters and divergence angles at the combination point, achieving good beam spot coincidence and minimizing beam loss without requiring excessively long optical paths for adjustment.
3Manufacturing precision
If multiple combining lenses are used for different colors, then color separation is improved, but device complexity increases
Solution Approach 1:
The combining lens group is designed with different lenses optimized for specific wavelength ranges. Each lens in the group has local quality characteristics tailored to its assigned color range, allowing effective combination of multiple colors while maintaining a compact and manageable structure rather than requiring an overly complex universal lens system.
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
Improves beam spot coincidence and reduces beam loss, facilitating miniaturization and efficient projection while maintaining high luminance and color accuracy.
Implementation Method 1
the beam expanding component is configured to increase divergence angles of the laser beams of first color and the laser beams of second color
Implementation Method 2
The plurality of combining lenses are configured to combine the laser beams of first color, the laser beams of second color and the laser beams of third color
Implementation Method 3
the diffusion component is configured to homogenize the illumination beams emitted by a beam outlet of the laser source assembly
Data Source
AI summary
A laser source assembly and a laser projection apparatus are provided. The laser source assembly includes a laser device and a combining lens group including includes a plurality of combining lenses and a beam expanding component. The laser device includes a first laser-exit region emitting laser beams of first color, a second laser-exit region emitting laser beams of second color and a third laser-exit region emitting laser beams of third color. The beam expanding component is disposed in beam paths of the laser beams of first color and the laser beams of second color before being combined with the laser beams of third color, and the beam expanding component is configured to increase divergence angles of the laser beams of first color and the laser beams of second color. The beam expanding component is disposed on laser-exit sides of the first laser-exit region and the second laser-exit region.