Compact Polarization Beam Splitter Prism Assembly
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Solution Overview
Problem
Current polarization beam splitters for projection apparatus are bulky, inefficient, and difficult to fabricate, leading to light leakage and unused regions, which results in undesirable ghost images and high production costs.
Innovation Solution
A compact polarization beam splitter composed of six prisms with diagonal interfaces and non-triangular cross-sectional shapes, featuring stepped optical surfaces and polarization beam splitting materials, which reduces size, light leakage, and improves brightness and contrast, while being easier to fabricate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the polarization beam splitter is made compact, then the device size is reduced, but light leakage increases causing ghost images
Solution Approach 1:
The polarization beam splitter is divided into multiple prisms (at least six) assembled together to form a single solid component. This segmentation allows for better control of light paths and reduction of light leakage while maintaining a compact overall size, resolving the contradiction between compactness and light leakage control.
Solution Approach 2:
Polarization beam splitting material is disposed on specific surfaces of the prisms to act as an intermediary that controls light separation. This material ensures proper polarization beam splitting at the interfaces between prisms, preventing light leakage while maintaining the compact segmented structure.
2Illumination intensity
If the polarization beam splitter uses stepped optical surfaces, then brightness and contrast improve, but fabrication difficulty increases
Solution Approach 1:
The stepped optical surfaces are achieved through assembly of multiple prisms with different heights rather than machining steps into a single block. This segmentation transforms a difficult machining problem into a simpler assembly problem, maintaining high brightness and contrast while significantly improving ease of manufacture.
Solution Approach 2:
The complex mechanical machining of stepped surfaces is replaced by optical assembly of pre-fabricated prisms. Instead of using precision machining to create stepped surfaces, the patent uses the geometric arrangement of multiple prisms to achieve the same optical effect, substituting mechanical fabrication with optical assembly.
3Ease of manufacture
If the polarization beam splitter uses traditional single-block design, then fabrication is simpler, but device size increases and efficiency decreases
Solution Approach 1:
The single-block design is segmented into multiple prisms that can be fabricated separately with simpler geometry and then assembled. This maintains relative fabrication simplicity while dramatically reducing the overall device size and improving optical efficiency by eliminating unused regions.
Solution Approach 2:
The design transitions from a single-block three-dimensional structure to a multi-prism assembly where prisms can be arranged in specific configurations. This dimensional reorganization allows for compact packaging while maintaining ease of fabrication through modular assembly.
4Object-generated harmful factors
If the polarization beam splitter has larger size, then light leakage is reduced, but device efficiency decreases due to unused regions
Solution Approach 1:
The segmented prism structure allows each prism to be precisely sized and positioned to match the actual light paths. This eliminates unused regions while maintaining adequate separation of light beams, achieving both light leakage control and high device efficiency simultaneously.
Solution Approach 2:
The polarization beam splitting material is applied locally at specific prism interfaces where it is needed for beam separation. This local application ensures effective light leakage control at critical interfaces while minimizing material usage and maintaining high overall device efficiency.
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 the creation of compact, high-brightness, and cost-effective polarization beam splitters that minimize light leakage and enhance image projection efficiency, suitable for wide-screen and three-dimensional imaging applications.
Implementation Method 1
At least one surface of a prism that forms a portion of the diagonal interface has a polarization beam splitting material disposed thereon resulting in a diagonal interface that includes a polarization beam splitting material
Data Source
AI summary
A polarization beam splitter includes at least six prisms assembled together to form a single solid components. At least one diagonal interface is formed by a combination of two or more prism surfaces. The solid polarization beam splitter component has at least four light entrance/exit surfaces with at least one of the light entrance/exit surfaces including a step. At least one of the prisms has a non-triangular cross-sectional shape. At least one surface of a prism that forms a portion of the diagonal interface has a polarization beam splitting material disposed thereon resulting in a diagonal interface that includes a polarization beam splitting material. The polarization beam splitter can be incorporated into various image projection apparatus including 2D, multiple image, and 3D projection apparatuses.