Light Source Device Beam Splitting Mirror Uniformity
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Solution Overview
Problem
Projection devices using solid-state light emitting elements face challenges in achieving uniform intensity distribution of light due to discrete intensity distribution caused by spacing of light sources for cooling purposes, leading to uneven illumination.
Innovation Solution
A light source device comprising a plurality of solid-state light emitting elements, a light splitting mirror to split incident beams by penetration and reflection, and a reflection mirror to reflect split beams in the same direction, ensuring uniform intensity distribution by doubling the number of beams and matching their optical axes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If light sources are spaced apart for cooling purposes, then heat dissipation is improved, but intensity distribution uniformity deteriorates
Solution Approach 1:
The light beam from each light source is segmented into multiple sub-beams using light splitting mirrors. Each light source's beam is divided into first and second light beams, which are then further subdivided by additional light splitting mirrors into multiple third light beams. This segmentation allows the light from spaced-apart sources to be redistributed into finer, more uniformly distributed beams across the target area, resolving the contradiction between heat dissipation requirements and intensity uniformity.
Solution Approach 2:
The patent introduces a multi-dimensional beam redistribution approach by using arrays of light splitting mirrors positioned at different locations and orientations. The first and second light beams are split into multiple third light beams that propagate in different directions, effectively distributing light intensity across additional spatial dimensions. This dimensional expansion allows uniform illumination despite the one-dimensional spacing constraint imposed by cooling requirements.
2Power
If output per light source is increased, then brightness is improved, but cooling requirements increase
Solution Approach 1:
By segmenting the beam from each high-power light source into multiple lower-intensity sub-beams, the patent enables the use of higher-power individual light sources without overwhelming the cooling system. The total light output is maintained or enhanced, but the intensity is distributed across multiple beams, reducing the thermal load concentration and allowing effective heat dissipation while maintaining high brightness.
3Power
If number of light sources is increased to compensate for spacing, then total brightness is improved, but device complexity increases
Solution Approach 1:
The light splitting mirror assembly serves multiple functions simultaneously: it divides beams from multiple light sources, redistributes light intensity for uniformity, and directs light paths for proper optical alignment. This multi-functionality allows the system to achieve uniform illumination from a reduced number of light sources, thereby maintaining total brightness while reducing device complexity compared to systems that would require additional light sources.
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 effectively doubles the number of beams with halved intensity, achieving a uniform light intensity distribution even when some light sources are not operational, reducing the impact of individual light source non-uniformities and failures, and maintaining image quality.
Implementation Method 1
a light splitting mirror provided in correspondence to the first solid-state light emitting elements and configured to split the first beams, which are incident from a first direction, by penetration and reflection
Implementation Method 2
a reflection mirror provided in correspondence to the light splitting mirror and configured to reflect one first beams split at the light splitting mirror in the same direction as the other first beams split at the light splitting mirror
Data Source
AI summary
A light source device includes a plurality of first solid-state light emitting elements configured to emit first beams. a light splitting mirror provided in correspondence to the first solid-state light emitting elements and configured to split the first beams, which are incident from a first direction, by penetration and reflection, and a reflection mirror provided in correspondence to the light splitting mirror and configured to reflect one first beams split at the light splitting mirror in the same direction as the other first beams split at the light splitting mirror.