Screen Apparatus Segmented Holding Member Flatness
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Solution Overview
Problem
Conventional screen apparatuses face challenges in maintaining flatness due to wrinkles caused by uneven tension and expansion/contraction ratios, leading to distorted images, especially in large-sized screens used for high-definition projection.
Innovation Solution
A screen apparatus with a tubular crossbar and internal holding members, including left-end, right-end, and central-part holding members, which distribute tension evenly to absorb slight stretches or shrinks, preventing wrinkles by maintaining horizontal positions and applying balanced expansion forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single holding member is used to hold the screen body, then the structure is simple, but wrinkles occur due to uneven tension distribution
Solution Approach 1:
The holding member is divided into three separate holding members (first, second, and third holding members) positioned at different locations (left end, right end, and center) of the screen body. Each holding member independently applies tension to its respective region, ensuring uniform tension distribution across the entire screen body and preventing wrinkle formation while maintaining structural simplicity.
2Area of moving object
If expansion wires are pulled tightly to expand the screen body, then the screen body is expanded, but the holding members incline and cause wrinkles
Solution Approach 1:
The three holding members are positioned at specific locations (left end, right end, and center) of the screen body to provide localized tension control. This distributed positioning ensures that each holding member maintains proper alignment and horizontality during expansion, preventing the inclining and wrinkle formation that occurs with single-point or uneven tension application.
3Manufacturing precision
If the screen body is tensioned to improve flatness, then flatness is improved, but the holding members are affected by weight and incline
Solution Approach 1:
Dividing the holding member into three separate holding members positioned at the left end, right end, and center of the screen body distributes the load-bearing function. This segmentation allows each holding member to independently support its local region, maintaining position stability and horizontality even when supporting the screen body weight, thereby preserving both flatness and stability.
Data Source
AI summary
A low-cost screen apparatus capable of realizing, with its simple mechanism, a method of obtaining flatness of a screen body that has been difficult to realize with expansion using an upper and lower crossbar for support. A holding member 11 holding an upper end of a screen body is provided inside a tubular crossbar provided to the upper end of the screen body. The holding member 11 is formed of at least three divisions including: a left-end-part holding member 12 that holds a left end part of the screen body and pulls the screen body toward a left end of the crossbar; a right-end-part holding member 13 that holds a right end part of the screen body and pulls the screen body toward a right end of the crossbar; and a central-part holding member 14 that is disposed between the left-end-part holding member 12 and the right-end-part holding member 13 and holds a central part of the screen body.