Concave Projection Screen with Tendon-Tensioned Flexible Cloth
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Solution Overview
Problem
Existing projection screens with rigid or semi-rigid concave surfaces are cumbersome for home use due to difficulty in setup and dismantling and occupy significant space when not in use, as they cannot be easily folded or stored compactly without wrinkling.
Innovation Solution
A projection screen featuring a flexible projection cloth with tensioning tendons integrated into a concave support frame, allowing for easy setup, dismantling, and compact storage, while maintaining a large viewing angle by tensioning the cloth in a flat direction and using side tendons to prevent edge curling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rigid or semi-rigid segments are used for the concave projection surface to prevent wrinkles, then the projection surface remains wrinkle-free, but the projection screen becomes difficult to set up and dismantle and occupies significant space when stored
Solution Approach 1:
The patent uses a flexible projection cloth instead of rigid or semi-rigid segments. The cloth is tensioned using tendons arranged in tendon profiles on the concave support frame, allowing it to maintain a wrinkle-free surface while being flexible enough to roll up for compact storage and easy setup/dismantling.
2Reliability
If rigid or semi-rigid segments are used for the concave projection surface, then the projection surface maintains its shape, but the projection screen occupies significant space when not in use
Solution Approach 1:
The flexible projection cloth can be rolled up into a compact cylinder when not in use, dramatically reducing storage space. The concave shape and wrinkle-free appearance are maintained during use through the tendon tensioning system.
Solution Approach 2:
The projection screen transitions from a static rigid structure to a dynamic flexible system. The cloth can be rolled up for storage and unrolled for use, with the tendon tensioning system dynamically maintaining the proper tension and shape during operation.
3Adaptability or versatility
If the projection cloth is tensioned in the second direction to remain flat, then the viewing angle is maintained, but the cloth may wrinkle in the first direction
Solution Approach 1:
The patent applies different tensioning strategies to different directions and regions. The tendons are arranged specifically in tendon profiles that provide tension in the first direction (perpendicular to the concave direction) where needed, while allowing the cloth to remain flat in the second direction for optimal viewing angle.
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
Enables simple and compact storage of the projection screen, preventing wrinkles and maintaining a large viewing angle, making it suitable for home use and reducing space requirements.
Implementation Method 1
an upper tendon and lower tendon which are arranged in a tendon profile of respectively the upper frame part and the lower frame part for the purpose of tensioning the projection cloth in the second direction
Data Source
Figure 1~4
AI summary
The invention relates to a projection screen comprising a projection surface arranged on a concave support frame, which support frame comprises a concave upper frame part and a concave lower frame part lying at a distance therefrom and which projection surface is concave in a first direction and is flat in a second direction lying at right angles to the first direction, wherein the projection surface is formed by a projection side of a flexible projection cloth, wherein the peripheral edge of the projection cloth comprises an upper edge and lower edge and which projection cloth extends in the second direction from the lower edge to the upper edge and comprises on a rear side lying opposite the projection side and close to and parallel to the upper and lower edge respectively an upper tendon and lower tendon which are arranged in a tendon profile of respectively the upper frame part and the lower frame part for the purpose of tensioning the projection cloth in the second direction.