Projection Lens with Reflective Optical Element
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Solution Overview
Problem
Conventional ultra-short throw projection lenses have a high number of lenses, leading to increased production costs, weight, and complex mechanism design, as well as a longer overall length.
Innovation Solution
A projection lens configuration with a first lens group, an aperture stop, a second lens group, a reflective optical element, and a refractive optical element, arranged in sequence along the optical axis, reducing the number of lenses and simplifying the optical structure, while maintaining effective image projection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional ultra-short throw projection lens uses many lenses to achieve effective image projection, then the imaging quality is maintained, but the production cost and weight increase
Solution Approach 1:
The patent combines multiple lens functions into fewer optical elements. Specifically, it integrates a reflective optical element and a refractive optical element that work together to perform functions that would traditionally require multiple separate lenses, thereby reducing weight while maintaining imaging quality
Solution Approach 2:
The reflective optical element and refractive optical element are designed to perform multiple functions simultaneously. The reflective element handles both reflection and positioning of intermediate images, while the refractive element manages field curvature and image formation, creating a multi-functional optical system that reduces overall component count
2Reliability
If a conventional ultra-short throw projection lens uses many lenses to achieve effective image projection, then the imaging quality is maintained, but the production cost increases
Solution Approach 1:
The patent merges multiple lens functions into fewer optical elements, including the integration of reflective and refractive components. This reduction in component count directly lowers production costs while maintaining imaging quality through the coordinated design of the remaining elements
3Reliability
If a conventional ultra-short throw projection lens uses many lenses to achieve effective image projection, then the imaging quality is maintained, but the overall length increases
Solution Approach 1:
The patent introduces a reflective optical element that changes the optical path geometry from a purely linear arrangement to one that utilizes reflective surfaces. This allows the optical system to achieve the required image projection in a more compact linear configuration by folding or redirecting light paths
Solution Approach 2:
By combining the reflective optical element and refractive optical element in a compact arrangement, the patent achieves effective image projection with fewer components positioned closer together, reducing the overall length of the projection lens
4Reliability
If a conventional ultra-short throw projection lens uses many lenses to achieve effective image projection, then the imaging quality is maintained, but the mechanism design becomes complicated
Solution Approach 1:
The patent simplifies mechanism design by merging multiple lens functions into fewer optical elements. The reduced component count directly translates to simpler mounting structures, fewer alignment requirements, and less complex mechanical support systems
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 reduces the number of lenses, decreasing the overall size and cost of the projection lens, simplifying the optical structure, and maintaining high imaging quality and clarity.
Implementation Method 1
The image beam is reflected by the reflective optical element to the refractive optical element
Implementation Method 2
The image beam is reflected by the reflective optical element to the refractive optical element, and then passes through the refractive optical element to form a projection beam
Data Source
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AI summary
A projection lens includes a first lens group, an aperture stop, a second lens group, a reflective optical element, and a refractive optical element arranged in sequence on a transmission path of an image beam. The first lens group, the aperture stop and the second lens group are sequentially arranged from a minified side to a magnified side along an optical axis. The reflective optical element and the refractive optical element are located on opposite sides of the optical axis. The image beam sequentially passes through the first lens group, the aperture stop and the second lens group from the minified side to be transmitted to the reflective optical element. The image beam is reflected by the reflective optical element to the refractive optical element, and passes through the refractive optical element to form a projection beam toward the magnified side.