Double Blind with Vertical Shade Light Leakage Control
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Solution Overview
Problem
Conventional window blinds face issues with light leakage and damage to edges due to cord manipulation, failing to provide complete light exclusion and aesthetic appeal while maintaining a slim profile.
Innovation Solution
A blind system with a head rail featuring an upper opaque blind and a lower translucent blind, where both blinds are operated by control elements that guide cords forwardly to avoid contact with the panels, allowing for complete light exclusion and a compact, aesthetically pleasing design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If cord loops are allowed to hang beside the blind panels for manual operation, then ease of operation is improved, but light leakage occurs at the edges and the blind fails to provide complete light exclusion
Solution Approach 1:
A control guide is introduced as an intermediary component that channels the control element away from the blind panel edge. The control guide receives the control element and directs it along a predetermined path that does not contact the blind panel, thereby eliminating light leakage while preserving manual operability.
2Device complexity
If cord loops are positioned close to the blind panel edges for compact design, then device complexity is reduced, but the edges of the panels become damaged due to cord manipulation
Solution Approach 1:
The control guide serves as a protective intermediary that physically separates the control element from the blind panel edge. This intermediary structure allows the control element to be positioned close to the panel for compact design while preventing direct contact that would cause edge damage.
Solution Approach 2:
The control guide is pre-positioned and fixed to the head rail before the blind is operated. This preliminary placement ensures that the control element is guided away from the panel edge from the start of operation, preventing cumulative damage that would occur with repeated manipulation.
3Illumination intensity
If a single thick opaque blind panel is used for complete light exclusion, then light exclusion is improved, but privacy is lost when the blind is raised and appearance becomes crude
Solution Approach 1:
The blind system is segmented into two distinct panels: a first blind panel made of translucent material for aesthetic appeal and partial privacy, and a second blind panel made of opaque material for complete light exclusion. These segmented panels can be operated independently or together to achieve different functional and aesthetic effects.
Solution Approach 2:
Different portions of the blind system have different optical properties. The first blind panel uses translucent material with specific aesthetic qualities, while the second blind panel uses opaque material for maximum light blocking. This local differentiation of material properties allows simultaneous achievement of aesthetics and complete light exclusion.
Data Source
AI summary
A blind for a building opening, and having an upper blind roller, located in an upper region of the head rail, a lower blind attachment located in a lower region of the head rail, an upper blind stored on the upper blind roller, a lower blind stored on the lower blind attachment, a lower blind support wall, and a blind carriage mechanism thereon, for carrying vertical blind slats, so as to provide a head rail having a slim, aesthetically pleasing profile.