Illumination System With Spherical Source Layout for Uniform Projection
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Solution Overview
Problem
Existing projection apparatuses using multiple laser beam sources face issues with asymmetric light combination, leading to poor uniformity and complex structure, which complicates achieving high brightness and uniform projection images.
Innovation Solution
The illumination system employs a symmetrical light-combining structure with at least two light-combining modules and a light-homogenizing device, where light source modules are arranged on a spherical surface centered on the light-homogenizing device's entrance surface, allowing symmetric entry of excitation beams, and uses focusing lenses to focus beams onto this surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple laser beam sources are added to achieve higher brightness, then the brightness of the projection apparatus is improved, but the structure becomes more complex and the light combination becomes more difficult
Solution Approach 1:
The patent combines multiple laser beam sources (red, green, blue lasers) into a unified illumination system with a common optical path. The light sources are integrated with shared optical components including a single light homogenizing device and a single projection lens, merging previously separate optical paths into one cohesive system that achieves high brightness without proportional increases in structural complexity
Solution Approach 2:
The patent implements universal optical components that serve multiple light sources simultaneously. The light homogenizing device processes beams from all three laser sources, and the projection lens projects all combined colors, creating multi-functional elements that reduce overall system complexity while maintaining the capability to deliver high brightness across the full color spectrum
2Illumination intensity
If multiple laser beam sources are combined asymmetrically to achieve high brightness, then the brightness is improved, but the uniformity of projection images deteriorates
Solution Approach 1:
The patent deliberately employs asymmetric optical components, specifically a wedge-shaped prism, to correct for asymmetric light source arrangements. The asymmetric prism compensates for the non-uniform distribution of multiple laser beams, transforming the asymmetric input into a symmetric, uniform output that maintains both high brightness and image uniformity
Solution Approach 2:
The patent adjusts optical parameters including the angles and positions of optical components to optimize light distribution. By carefully controlling the incident angles of different laser beams and adjusting the geometry of the light homogenizing device, the system transforms parameter variations into uniform light output, achieving both high brightness and projection uniformity
3Device complexity
If traditional light combination methods are used for multiple laser sources, then the structure is simpler, but the uniformity and brightness of projection images are poor
Solution Approach 1:
The patent segments the illumination system into distinct functional modules: individual laser sources, a combined light homogenizing device, and a projection lens. This segmentation allows each component to be optimized independently while working together in an integrated system, achieving high brightness without excessive complexity by dividing the system into manageable, specialized sections
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 configuration enhances the uniformity and brightness of projection images by ensuring symmetric light combination and efficient light energy utilization, reducing the complexity and volume of the projection apparatus.
Implementation Method 1
the focusing lens is located between the light source module and the light-homogenizing device, and the focusing lens is located on a path of excitation beam. The light source module is disposed on a spherical surface with the light-entrance surface of the light-homogenizing device as a center of the circle, and the excitation beam from the focusing lens is focused on the light-entrance surface of the light-homogenizing device.
Implementation Method 2
a light-homogenizing device. Each of the least two light-combining modules includes a light source module and a focusing lens... the excitation beam from the focusing lens is focused on the light-entrance surface of the light-homogenizing device
Data Source
AI summary
An illumination system configured to provide an illumination beam is provided. The illumination system includes at least two light-combining modules and a light-homogenizing device. One of the at least two light-combining modules includes a light source module and a focusing lens. The light source module is configured to emit an excitation beam, a focusing lens is located between the light source module and the light-homogenizing device, and the focusing lens is located on a path of the excitation beam. The light-homogenizing device includes a light-entrance surface and a light-exit surface. The light source module is disposed on a spherical surface with the light-entrance surface of the light-homogenizing device as a center of a circle, and the excitation beam from the focusing lens is focused on the light-entrance surface of the light-homogenizing device. A projection apparatus is also provided, and uniformity of projection images of the projection apparatus is satisfactory.