Light Source Apparatus for Projectors with Flux Width Adjuster
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Solution Overview
Problem
In light source apparatuses for projectors, the varying aspect ratios and sizes of light emitting regions for different color lights lead to light beam truncation, reducing the efficiency of light output due to mismatched light source images on optical members.
Innovation Solution
A light source apparatus with a first and second light source part emitting different color lights, a combiner, a luminous flux width adjuster, and a diffuser system that adjusts the aspect ratios and sizes of light source images to match, using a luminous flux width adjuster with a finite focal length to equalize the luminous flux widths and collect light at distinct positions, ensuring uniform aspect ratios and sizes on the diffuser surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If light sources with different emitting region sizes are used to output various color lights, then the light output efficiency of each color light is improved, but the light source images formed on the optical member have different aspect ratios causing light beam truncation
Solution Approach 1:
The patent changes the optical parameters (focal length, object distance, image distance) of the light collection systems to adjust the aspect ratios and sizes of light source images. By optimizing these parameters, the light source images of different color lights are made to have consistent aspect ratios and sizes, eliminating light beam truncation while maintaining high light output efficiency.
Solution Approach 2:
The patent employs adjustable light collection systems with variable focal lengths or movable components that can dynamically adjust the imaging characteristics. This allows the system to adaptively optimize the light source image parameters for different color lights, ensuring uniform aspect ratios and sizes to prevent truncation.
2Productivity
If the light source images have different aspect ratios, then each color light can be efficiently collected, but light beam truncation occurs in the illumination system
Solution Approach 1:
The patent optimizes optical parameters including focal length, object distance, and image distance to control the aspect ratio and size of light source images. By adjusting these parameters, the system ensures that light source images of different color lights have consistent dimensions, preventing truncation while maintaining efficient light collection.
Solution Approach 2:
The patent introduces optical members (lenses, mirrors) as intermediaries between the light sources and the illumination system. These intermediaries transform and uniformize the light source images, converting the non-uniform images with different aspect ratios into uniform images that can pass through the illumination system without truncation.
3Manufacturing precision
If different light collection positions are used for different color lights, then the light source image uniformity is improved, but the optical system complexity increases
Solution Approach 1:
The patent utilizes parameter optimization (focal length, object distance, image distance) to achieve uniform light source images at different light collection positions. By carefully selecting and coordinating these parameters across multiple light collection paths, the system attains image uniformity without requiring overly complex optical arrangements.
Solution Approach 2:
The patent designs the optical system with universal components that serve multiple functions. The same optical members are used to collect and uniformize light from different color light sources at different positions, reducing the need for separate specialized components for each color light path and thereby controlling system complexity.
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 efficiency of light use by the homogenizing illumination system, reduces projector size, and minimizes color unevenness in projection images by ensuring uniform illuminance distribution across color lights.
Implementation Method 1
the luminous flux width adjuster having a finite focal length, the first luminous flux output from the first light source part and traveling via the luminous flux width adjuster
Implementation Method 2
a combiner that combines the first luminous flux and the second luminous flux with each other
Implementation Method 3
a first light collection system that collects light output from the combiner
Implementation Method 4
a first diffuser that the light output from the first light collection system enters
Data Source
AI summary
A light source apparatus according to an aspect of the present disclosure includes a first light source that outputs a first luminous flux, a second light source that outputs a second luminous flux, a combiner, a width adjuster that reduces the difference in width between the first luminous flux and the second luminous flux, a first light collection system, a first diffuser, a second light collection system, and a homogenizing system. The first luminous flux traveling via the width adjuster, the combiner, and the first light collection system is collected at a first position, and the second luminous flux traveling via the combiner and the first light collection system is collected at a second position. The width adjuster and the first light collection system approach the aspect ratio and size of a first image formed by the first luminous flux to those of a second image formed by the second luminous flux.