Compact Projector Focal Length Optimization
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Solution Overview
Problem
Conventional projectors often suffer from dark edges and deteriorated brightness due to non-integral consideration of focal lengths of multiple optical elements and arbitrary arrangement of distances between them, particularly in compact designs.
Innovation Solution
A minimized projector design that includes a light source unit, a light guide element, a first focus element with a focal length f1, a second focus element with a focal length f2 where 2.0 < f2/f1 < 3.6, and a micromirror element, optimizing the relationship between focal lengths to enhance energy and image transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If multiple optical elements are used to control image performance in conventional projectors, then the projector dimension can be minimized, but dark edges and deteriorated brightness occur due to non-integral consideration of focal lengths
Solution Approach 1:
The patent applies parameter changes by establishing a specific mathematical relationship between the focal lengths of the first and second focus elements (f2/f1) to optimize optical performance. This parameter optimization resolves the contradiction by ensuring that the compact design maintains sufficient brightness while minimizing projector dimension.
2Device complexity
If distances between optical elements are arranged based on previous design, then device complexity is reduced, but dark edges and deteriorated brightness occur due to lack of integral consideration
Solution Approach 1:
The patent establishes specific parameter relationships for both focal lengths (f2/f1 ratio) and distances between optical elements, transforming arbitrary design arrangements into optimized configurations that maintain brightness while controlling device complexity.
3Ease of manufacture
If focal lengths of multiple optical elements are not integrally considered, then ease of manufacture is improved, but dark edges and deteriorated brightness occur
Solution Approach 1:
The patent provides specific parameter relationships (f2/f1 ratio and distance formulations) that balance manufacturing simplicity with optical performance requirements, enabling integral consideration of focal lengths without significantly complicating the manufacturing process.
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 optimized focal length relationship improves brightness and projection quality by reducing aberration and ensuring uniform energy transmission, preventing dark edges and achieving sufficient brightness in compact projector designs.
Implementation Method 1
a light guide element
Implementation Method 2
a first focus element with a focal length f1
Implementation Method 3
a second focus element with a focal length f2
Implementation Method 4
a micromirror element
Data Source
AI summary
A projector comprises a light source unit, a light guide element, a first focus element, a second focus element, a micromirror element and an image unit. The light source unit provides a light beam. The first focus element comprises a first focal length f1. The second focus element comprises a second focal length f2, wherein2.0<f2f1<3.6.The light beam travels from the light source unit, passing the light guide element, the first focus element, the second focus element and the micromirror element to the image unit.