Portable Screen Dial Mechanism Tension Control
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Solution Overview
Problem
When using an ultrashort focus projector, the screen may become distorted due to slack in the screen material when the projector is installed at a close distance, requiring a solution to maintain tension and prevent image distortion.
Innovation Solution
A portable screen device with a dial mechanism that allows the screen to be tensioned in an extension state by rotating the roll and gear system, enabling the screen to be pulled back in a different direction from its extension, thereby maintaining tension and preventing distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the projector is installed at a close distance from the screen, then the projector can be positioned near the screen for ultrashort focus projection, but the screen may become distorted due to slack in the screen material
Solution Approach 1:
The patent introduces a dial mechanism that allows dynamic adjustment of the screen's tension state. The mechanism includes a reel that can be rotated to wind or unwind the screen, and a dial operation部 that controls the reel's rotation. This dynamic adjustment capability enables the screen to maintain proper tension even when installed close to the projector, resolving the contradiction between short projection distance and screen flatness.
2Ease of operation
If the screen is pulled out in an upward direction from the casing, then the screen can be deployed for use, but slack arises in the screen causing image distortion
Solution Approach 1:
The dial mechanism provides dynamic control over screen tension after deployment. The reel can be rotated via the dial operation部 to wind the screen and eliminate slack, transforming the static screen deployment process into a dynamically adjustable system that maintains proper tension.
Solution Approach 2:
The patent replaces the simple gravitational pull-out mechanism with a more complex mechanical system involving the reel and dial mechanism. This substitution allows for active control of screen tension through mechanical winding, replacing passive deployment with active tension management.
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 portable screen device effectively eliminates slack in the screen, ensuring accurate image projection even when the projector is positioned close to the screen, preventing distortion and allowing for clear content viewing.
Implementation Method 1
a gear, the gear being connected to an end portion of a shaft; a rotary part, the rotary part being located above the base plate and comprising knurls; a first engagement part, the first engagement part being located on the base plate and being capable of engaging with the knurls of the rotary part; and a second engagement part, the second engagement part being located on the rotary part and being capable of engaging with the gear
Data Source
AI summary
In order to provide a screen device capable of eliminating a slack arising in a screen pulled out, there is provided a portable screen device, comprising a casing, a roll, a screen, and a screen support part, the casing having an opening, the roll being rotatably placed in the casing, the screen being configured to be wound on the roll during a storage of the screen and to be pulled out in an upward direction from the opening of the casing upon an use of the screen, the screen support part being for supporting the screen in an extension state by a pull out of the screen, wherein a dial mechanism is provided on a side portion of the casing, and wherein the dial mechanism is partially capable of pulling the screen in the extension state back in a different direction from a pull out direction of the screen.