Projection System Short Distance Large Angle View
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Solution Overview
Problem
Current projection systems have a longer projection distance and smaller angle of view, which limits their ability to project images efficiently onto screens at shorter distances.
Innovation Solution
A projection system with a first optical system of refractive lenses and a second optical system including reflective surfaces, where the focal lengths of the reflective surfaces are arranged to satisfy the condition |f2| > |f1| > |f3>, allowing for a shorter projection distance and increased angle of view by optimizing the focal lengths of the first, second, and third reflective optical systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If conventional projection systems are used, then the projection distance is longer, but the angle of view is smaller
Solution Approach 1:
The projection system is divided into three separate reflective optical systems (first, second, and third) with distinct reflection surfaces having different curvatures and focal lengths. This segmentation allows each system to contribute differently to beam manipulation, achieving both short projection distance and large angle of view through coordinated action of the divided components.
Solution Approach 2:
The patent employs reflective surfaces with dynamic optical properties - specifically, surfaces with different curvature radii and focal lengths that can be optimized for different beam angles. The first reflection surface has a larger curvature radius for wide-angle beams, while the third has a smaller curvature radius for narrow-angle beams, creating a dynamic adaptation to different projection requirements.
2Length of moving object
If the projection distance is shortened, then the angle of view increases, but image sharpness and precision may deteriorate
Solution Approach 1:
Each reflective optical system is designed with specific local optical properties tailored to its function. The first reflective system handles wide-angle beams with a larger curvature radius, the second provides intermediate control, and the third handles narrow-angle beams with a smaller curvature radius. This local optimization ensures that each part of the optical path contributes to maintaining image sharpness despite the shortened projection distance.
Solution Approach 2:
The patent systematically varies key parameters across the three reflective systems - specifically the curvature radius and focal length of each reflection surface. By changing these parameters in a controlled sequence (larger to smaller curvature radii), the system maintains optimal beam control throughout the optical path, preserving image precision even at short projection distances.
3Length of moving object
If complex optical systems are designed to achieve short projection distance, then manufacturing precision becomes more difficult, but performance improves
Solution Approach 1:
Dividing the complex optical function into three separate reflective systems simplifies the manufacturing of each individual component. Each reflection surface can be manufactured and tested independently with standard precision requirements, rather than requiring one complex surface to perform multiple functions. This segmentation makes the overall system more manufacturable while achieving the desired short projection distance.
Solution Approach 2:
The patent uses spherical or aspherical curved surfaces for the reflection surfaces, which are well-established manufacturing forms that can be produced with conventional techniques. By utilizing these standard curved geometries with carefully selected curvature radii, the system achieves complex optical functionality without requiring ultra-precise or exotic manufacturing processes.
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 system achieves a shorter projection distance and larger angle of view, enabling sharper and more precise image projection onto screens, while allowing for precise manufacturing and correction of aberrations.
Implementation Method 1
the first reflective optical system having a first reflection surface having a concave aspherical shape
Implementation Method 2
the second reflective optical system having a second reflection surface having a concave shape or a planar shape
Implementation Method 3
the third reflective optical system having a third reflection surface having a convex aspherical shape
Implementation Method 4
the first optical system formed of a plurality of lenses, the first optical system having positive power
Data Source
AI summary
A projection system includes a first optical system and a second optical system sequentially arranged from the reduction side toward the enlargement side, the first optical system formed of a plurality of lenses. The first reflective optical system has a first reflection surface having a concave aspherical shape. The second reflective optical system has a second reflection surface having a concave shape or a planar shape. The third reflective optical system has a third reflection surface having a convex aspherical shape. At least two of the first, second, and third reflection surfaces each have an aspherical shape. The projection system satisfies Conditional Expression (1) below|f2|>|f1|>|f3| (1)where f1 represents the focal length of the first reflective optical system, f2 represents the focal length of the second reflective optical system, and f3 represents the focal length of the third reflective optical system.