Polymeric Projection Screen Tensioning via Bonded Retention Members
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Solution Overview
Problem
Current projection screens face challenges with wrinkle formation due to settling and environmental changes, requiring high tension loads that are difficult to achieve without damaging the screen, especially for larger sizes, and existing tensioning methods are complex and prone to errors.
Innovation Solution
A polymeric projection screen with a retention member bonded to the screen along its edge, allowing for high tension loads without weakening the screen, using materials like lightweight metals or plastics, and bonding methods such as ultrasonic welding, vacuum bonding, or magnetic bonding to ensure wrinkle-free images without the need for holes or complex assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If traditional tensioning methods with holes and bolts are used, then high tension loads can be applied to eliminate wrinkles, but the screen is weakened and damaged
Solution Approach 1:
The patent replaces the mechanical bolt-and-hole tensioning system with a bonding system that uses adhesive or ultrasonic welding to attach retention members to the screen edges. This substitution eliminates the need for holes in the screen, thereby maintaining screen integrity and strength while still enabling the application of high tension loads to eliminate wrinkles and prevent wrinkling.
2Ease of operation
If multiple holes are made in the screen for tensioning, then tensioning can be achieved, but the screen is weakened and prone to tearing
Solution Approach 1:
The patent eliminates the need for multiple holes in the screen by using a bonding system where retention members are attached to the screen edges through adhesive or ultrasonic welding. This maintains screen integrity and prevents tearing while still providing the necessary tensioning capability through the retention members and tensioning straps.
Solution Approach 2:
The patent extracts the tensioning function from the screen material itself and separates it into distinct retention members that are bonded to the screen edges. This extraction allows the screen to remain intact without holes while still enabling tensioning through the separate retention member system.
3Force
If complex assembly methods with multiple components are used, then tensioning can be achieved, but the construction process becomes time-consuming and complex
Solution Approach 1:
The patent merges the retention member and tensioning strap into an integrated assembly where the retention member is bonded to the screen edge and the tensioning strap is attached to the retention member. This merging simplifies the overall assembly process compared to traditional methods requiring separate holes, bolts, and multiple adjustment components.
Solution Approach 2:
The patent segments the tensioning system into modular components: retention members bonded to the screen edges and tensioning straps attached to the retention members. This segmentation allows for simpler, more flexible assembly and adjustment compared to traditional rigid bolted systems.
4Ease of operation
If user force alone is used for retensioning, then simple operation is achieved, but the required tension levels cannot be achieved
Solution Approach 1:
The patent incorporates adjustable tensioning straps with ratchets or friction locks that allow users to progressively increase tension in a controlled manner. This dynamic adjustment mechanism enables users to achieve high tension levels required to eliminate wrinkles while maintaining operational simplicity through incremental adjustment rather than requiring excessive user force.
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 provides a simplified and robust method for maintaining wrinkle-free screens under high tension loads, suitable for large sizes, with the ability to retrofit tension members and adjust for changes in conditions, enhancing the durability and usability of projection screens.
Implementation Method 1
bonding methods such as ultrasonic welding
Implementation Method 2
bonding methods such as vacuum bonding
Implementation Method 3
bonding methods such as magnetic bonding
Data Source
AI summary
Projection apparatuses and associated methods are provided. A representative apparatus includes: a support frame defining a projection area; a polymeric screen of sheet material sized and shaped to span at least a portion of the projection area; a retention member operative to contact the polymeric screen along an edge thereof; and a tensioning assembly operative to apply tension to the screen via the retention member, the tensioning assembly being operative to selectively reposition the retention member relative to the support frame.