Projector Illumination Device Using Anamorphic Lens System
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Solution Overview
Problem
Existing illumination devices for projectors face challenges in achieving uniform color distribution due to differences in cross-sectional sizes of colored light beams, leading to color unevenness, and require separate optical systems to adjust beam size and shape, resulting in increased device size.
Innovation Solution
A compact illumination device with a light beam magnifying optical system comprising specific lens surfaces (spherical and anamorphic) that adjust both the cross-sectional size and shape of light beams, allowing for a single diffusion element to be used across all colors, reducing device size and color unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If separate optical systems are used to adjust cross-sectional size and shape of light beams, then color uniformity is improved, but device size increases
Solution Approach 1:
The patent combines the functions of adjusting cross-sectional size and shape into a single optical system with four lens surfaces. The first and fourth lens surfaces adjust the cross-sectional size, while the second and third lens surfaces adjust the cross-sectional shape, eliminating the need for separate optical systems and reducing device size.
Solution Approach 2:
The optical system performs multiple functions simultaneously: it adjusts both the cross-sectional size and shape of light beams from different light sources. This multi-functional approach allows a single system to achieve color uniformity without requiring separate adjustment mechanisms for each parameter.
2Manufacturing precision
If cross-sectional sizes of colored light beams are made uniform, then color unevenness is reduced, but device complexity increases
Solution Approach 1:
The patent merges the adjustment of cross-sectional size and shape into one integrated optical system. By combining these functions, the system reduces overall complexity compared to having separate adjustment mechanisms for each parameter, while still achieving uniform color distribution.
Solution Approach 2:
The optical system employs asymmetric lens surface configurations where the first and fourth surfaces address size adjustment and the second and third surfaces address shape adjustment. This asymmetric arrangement optimizes the system for simultaneous multi-parameter control without requiring symmetric, overly complex designs.
3Manufacturing precision
If multiple diffusion elements are used for different colors, then color accuracy is improved, but device size and cost increase
Solution Approach 1:
The patent employs a single diffusion element that serves all color channels. By achieving uniform cross-sectional sizes and shapes for all colored light beams through the optical system, one diffusion element can effectively diffuse all colors without requiring separate elements for each color, thereby reducing component quantity and cost.
Solution Approach 2:
The patent combines the diffusion function for all colors into a single element. This merging is made possible because the preceding optical system has already standardized the beam parameters, allowing one diffusion element to handle all colors uniformly rather than requiring multiple specialized elements.
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 a smaller, more cost-effective illumination device that adjusts light beam size and shape uniformly, minimizing color unevenness in projected images while eliminating the need for separate diffusion elements, thus enhancing image quality and reducing device size and complexity.
Implementation Method 1
The light beam magnifying optical system includes a first lens surface, a second lens surface, a third lens surface, and a fourth lens surface disposed in sequence from an incident side of the first light, the first lens surface is formed of a spherical surface having power, the second lens surface is formed of a first anamorphic surface having power with the same sign as a sign of the power of the first lens surface
Data Source
AI summary
An illumination device includes a first light source section which includes at least one first light emitting element adapted to emit first colored light collimated, and is adapted to emit first light including the first colored light, and a light beam magnifying optical system adapted to magnify the first light. The light beam magnifying optical system includes first through fourth lens surfaces arranged in sequence from an incident side of the first light, the first lens surface is formed of a spherical surface having power, the second lens surface is formed of a first anamorphic surface having power with the same sign as the sign of the power of the first lens surface, the third lens surface is formed of a second anamorphic surface having positive power, and the fourth lens surface is formed of a spherical surface having positive power.