Tensioned Projection Screen Frame Groove Auxiliary Element
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Solution Overview
Problem
Existing tensioned projection screens face difficulties in easy installation and uniform tension distribution, especially for large screens, due to high force requirements and geometric tolerances that lead to stress variations and visual artifacts.
Innovation Solution
A perimeter frame with grooves or tracks and a fastening edge system, including a compressible auxiliary element made of materials like polyurethane or rubber, allows for easier attachment and tension adjustment of the projection screen, ensuring uniform stress distribution and preventing the fastening edge from exiting the groove.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the screen size is increased to create large projection screens, then the projection area is improved, but the total force required to stretch and tension the screen increases significantly
Solution Approach 1:
The frame is divided into multiple segments that can be independently adjusted. Instead of tensioning the entire large screen at once, the adjustment mechanism allows分段 adjustment of frame segments, distributing the tensioning process and reducing the peak force required at any single moment during installation.
2Manufacturing precision
If the screen is tensioned to eliminate visual artifacts, then the image quality is improved, but the stress variation across the screen caused by frame deformation and tolerances worsens
Solution Approach 1:
The frame includes adjustable segments that can be dynamically modified after assembly. The adjustment mechanism allows the frame geometry to be fine-tuned to compensate for manufacturing tolerances and deformations, enabling uniform stress distribution to be achieved even with imperfect frame components.
Solution Approach 2:
The adjustment mechanism provides a feedback loop for tensioning. By allowing incremental adjustments to frame segment positions, the system enables observation and correction of stress distribution patterns, ensuring uniform tension across the screen while compensating for frame imperfections.
3Stability of the object's composition
If the rod is made wider than the track to prevent rotation, then the stability of the rod in the track is improved, but the ease of positioning the rod in the track deteriorates
Solution Approach 1:
The auxiliary element acts as an intermediary component between the rod and the track. This separate element provides the rotational constraint function without requiring the rod itself to be wide, thus maintaining rod stability while preserving ease of positioning.
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
Facilitates the assembly and tensioning of large projection screens with uniform stress distribution, reducing the force required and minimizing visual artifacts by using a compressible auxiliary element to compensate for frame deformations and tolerances.
Implementation Method 1
a compressible auxiliary element made of materials like polyurethane or rubber
Implementation Method 2
The auxiliary element can be made of a suitable compressible material such as an elastomer or a rubber
Data Source
AI summary
A projection screen apparatus and method of making the same. The apparatus has a perimeter frame and a projection screen where the perimeter frame includes an upper frame member, a lower frame member, a left frame member and a right frame member, where at least two of the frame members have a groove or track. The projection screen has fastening edges on at least two opposite sides for fastening the projection screen to the perimeter frame by inserting the fastening edge in the groove or track of a frame member. An auxiliary element is inserted in the groove or track next to a fastening edge, to prevent the fastening edge from exiting the groove.