Card Switch Actuation Member for Smart Card
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Solution Overview
Problem
Incorporating switches into electronic smart cards with thicknesses greater than 0.8 mm is challenging due to the increased pressure threshold and reduced feedback caused by fillers, which hinder the functionality of switches in confined and hermetic environments.
Innovation Solution
A switch assembly with a sealed housing featuring a switch member and an actuation member that transfers pressure from the card's surface to the switch member, minimizing the displacement distance and reducing the void between components to facilitate activation and provide tactile feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If filler is used to give structural integrity to the card, then structural integrity is improved, but the pressure threshold required to activate the switch increases and feedback sensation is reduced
Solution Approach 1:
The switch assembly is segmented into distinct functional components: a switch member for electrical contact and an actuation member for mechanical actuation. This segmentation allows the switch member to remain thin and responsive while the actuation member extends through the filler material to receive user input, resolving the contradiction between structural integrity provided by filler and switch activation ease.
Solution Approach 2:
The actuation member serves as an intermediary element that transmits force from the user's finger through the filler material to the switch member. This intermediary structure allows the switch to be activated despite the presence of filler, as the actuation member bridges the gap between the user's input and the switch member while minimizing the displacement distance required.
2Length of stationary object
If card thickness is increased, then structural integrity is improved, but switch functionality is reduced due to increased filler thickness
Solution Approach 1:
The switch assembly utilizes the thickness dimension of the card effectively by positioning the switch member near one surface and the actuation member extending toward the opposite surface. This dimensional arrangement allows the switch to function reliably in thicker cards, as the actuation member can traverse the increased distance through the filler material while maintaining a minimal displacement distance at the switch member location.
3Strength
If filler thickness is increased, then structural integrity is improved, but the displacement distance required to activate the switch increases
Solution Approach 1:
By separating the switch member from the actuation interface, the design allows the actuation member to handle the displacement through filler material while the switch member itself requires minimal displacement. This segmentation resolves the contradiction between structural integrity (requiring thicker filler) and displacement distance (requiring thin filler).
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 solution enables effective activation of switches in thicker electronic cards by reducing the displacement distance and void volume, enhancing user feedback and switch functionality while maintaining structural integrity.
Implementation Method 1
upon application of a pressure on the second surface, the pressure is applied on the actuation surface, thereby displacing the actuation member along the axis with the contact surface exerting the pressure on the switch member
Data Source
AI summary
There is provided a switch assembly for an electronic card. The switch assembly is mounted within a housing of the card and comprises a switch member adapted to travel axially relative to the housing between a rest position and an actuated position upon application of pressure on the switch member. An actuation member is positioned adjacent the switch member and adjacent an upper face of the housing. Upon exertion of pressure on the upper face, the pressure also applies on the actuation member, thereby displacing the latter. Displacement of the actuation member in turn transfers the pressure to the switch member to move the latter to the actuated position.