Quartz Crystal Polarization Conversion Device for Thermal Dissipation
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Solution Overview
Problem
Existing polarization conversion devices in liquid crystal projectors face challenges with heat dissipation, adhesive reliability, and optical rotatory effects, leading to reduced efficiency and operating life, particularly due to the use of glass substrates and thin plasma polymerized films.
Innovation Solution
A polarization conversion device using a transmissive substrate made of crystalline material with birefringent and optical rotatory properties, where the substrate is disposed at a predetermined angle to separate light into orthogonal polarized beams, and a phase difference plate converts the polarization plane, eliminating the need for a transparent member and enhancing heat dissipation with quartz crystal components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If glass substrate and plasma polymerized film are used for polarization conversion device, then manufacturing ease is improved, but heat resistance and operating life deteriorate
Solution Approach 1:
The patent changes the material parameter from glass substrate to quartz crystal substrate, which has superior heat resistance properties. This parameter change resolves the contradiction by maintaining manufacturing feasibility while significantly improving heat resistance and operating life of the polarization conversion device
Solution Approach 2:
The patent employs a composite structure combining quartz crystal substrate with polarization separation film and reflective film layers. This composite material approach allows the device to leverage the excellent heat resistance of quartz crystal while maintaining the optical functionality provided by the film layers, thus resolving the contradiction between ease of manufacture and heat resistance
2Ease of operation
If glass substrate is used, then assembly ease is improved, but thermal dissipation capability deteriorates
Solution Approach 1:
The patent changes the substrate material parameter from glass to quartz crystal, which has inherently superior thermal conductivity. This parameter change directly addresses the thermal dissipation issue while the modular design maintains assembly ease, resolving the contradiction between assembly ease and thermal dissipation capability
3Stability of the object's composition
If transparent member is included in the structure, then structural stability is improved, but device complexity increases
Solution Approach 1:
The patent merges the functions of the transparent member and the quartz crystal substrate by making the quartz crystal substrate itself serve as the structural support. This merging eliminates the need for a separate transparent member, thereby reducing device complexity while maintaining structural stability through the inherent strength of the quartz crystal substrate
4Ease of operation
If adhesive is used to bond components, then assembly ease is improved, but adhesive reliability under thermal load deteriorates
Solution Approach 1:
The patent extracts and eliminates the adhesive bonding step from the assembly process by designing a mechanical attachment system using attachment protrusions and attachment grooves. This extraction resolves the contradiction by maintaining assembly ease through simple mechanical fitting while eliminating the adhesive reliability issue under thermal load
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 achieves a compact structure with high heat resistance and extended operating life, maintaining polarization efficiency and improving assembly ease while reducing optical distortions and thermal issues.
Implementation Method 1
a transmissive substrate 21A made of a crystalline material 21C having a birefringent property and an optical rotatory property
Implementation Method 2
a transmissive substrate 21A made of a crystalline material 21C having a birefringent property and an optical rotatory property
Implementation Method 3
a phase difference plate 23, converts a polarization plane of the first linearly polarized light P transmitted through the transmissive substrate 21A into a polarization plane orthogonal to the polarization plane of the first linearly polarized light P, and emits it as the second linearly polarized light S
Implementation Method 4
eliminating the need for a transparent member and enhancing heat dissipation with quartz crystal components
Data Source
AI summary
A polarization separation device includes a transmissive substrate formed of crystalline material having a birefringent property and an optical rotatory property, and a polarization separation portion that is provided on an incidence-side surface of the transmissive substrate and transmits P-polarized light and reflects S-polarized light. A reflective element, which reflects the S-polarized light reflected by the polarization separation portion, is disposed substantially in parallel with the transmissive substrate. A phase difference plate is disposed at an emission-side of the transmissive substrate. The P-polarized light, which is transmitted through the polarization separation portion and is incident to the transmissive substrate, is made to be emitted from an emission-side surface of the transmissive substrate while maintaining a polarization plane thereof, and the polarization plane of the P-polarized light transmitted through the transmissive substrate is converted to be as S-polarized light in the phase difference plate.