Resilient Glass Polarizing Device for Liquid Crystal Projectors
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Solution Overview
Problem
Polarizing plates in liquid crystal projectors, made of synthetic resin films, are inherently soft and difficult to maintain a high degree of planeness, leading to irregularities in contrast and picture quality due to surface undulations and trapped air, which affect the optical accuracy and focusing of projected images.
Innovation Solution
A polarizing device is created by sandwiching a synthetic resin film between two glass members, with at least one glass member being a resilient glass plate capable of flexural deformation, using a tackiness agent for bonding to achieve a high degree of planeness and expel trapped air, ensuring accurate surface alignment and improved image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a synthetic resin film polarizing plate is used, then the polarizing function is achieved, but the surface planeness deteriorates due to the soft nature of the resin film
Solution Approach 1:
The polarizing plate is nested between a rigid glass member and a resilient glass plate, with the resilient glass plate conforming to the polarizing plate's surface to transfer and maintain its planeness. This nested structure allows the soft polarizing plate to achieve high surface planeness through the supporting glass plate.
Solution Approach 2:
The resilient glass plate acts as an intermediary between the rigid glass member and the soft polarizing plate. It transfers the planeness from the rigid glass member to the polarizing plate while accommodating the softness of the resin film, thus resolving the contradiction between maintaining polarizing function and achieving surface planeness.
2Strength
If a tackiness agent is used to bond the polarizing plate to glass, then bonding is achieved, but surface undulations and trapped air remain due to insufficient tack strength
Solution Approach 1:
The resilient glass plate copies the surface planeness of the rigid glass member and transfers it to the polarizing plate through bonding. This copying mechanism ensures that even though the tackiness agent provides only sufficient bonding, the surface planeness is maintained through the glass plate's geometric fidelity.
Solution Approach 2:
The resilient glass plate changes the mechanical parameters of the bonding interface by providing both rigidity (for planeness) and flexibility (for bonding). This parameter change allows the system to achieve both adequate bonding strength and high surface planeness simultaneously.
3Ease of manufacture
If the polarizing plate is made from soft synthetic resin, then ease of manufacture is improved, but optical accuracy deteriorates due to surface irregularities
Solution Approach 1:
The system uses a composite structure combining the soft synthetic resin polarizing plate with rigid glass members. This composite approach allows the soft, easy-to-manufacture resin plate to achieve optical accuracy through the supporting glass structure, resolving the contradiction between manufacturing ease and optical precision.
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 effectively imparts a high degree of planeness to the polarizing plate, reducing surface undulations and air bubbles, thereby enhancing the optical accuracy and quality of projected images by ensuring precise alignment and minimizing distortions.
Implementation Method 1
at least one of the glass members being in the form of a resilient glass plate capable of flexural deformation
Implementation Method 2
sandwiching a synthetic resin film between two glass members, with at least one glass member being a resilient glass plate capable of flexural deformation, using a tackiness agent for bonding
Data Source
AI summary
A polarizing device having a synthetic resin film of a polarizing plate sandwiched and bonded between two glass members. At least a surface on one side of the polarizing plate is bonded to one of glass members by the use of a tackiness agent. Adjoining surfaces of the two glass members, which are located on the side of the sandwiched polarizing plate, are finished to a high degree of planeness, and at least one of the two glass members is in the form of a resilient glass plate capable of flexural deformation in a lateral direction.