Secure Keypad Dome Structure With Anti-Tamper Mesh Layers
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Solution Overview
Problem
Existing data entry devices lack effective anti-tampering measures and efficient key depression mechanisms for secure and reliable data entry, particularly in secure environments like smart card readers.
Innovation Solution
A key entry device with a housing containing a keypad array, a dome array, and a protrusion array, where key depression causes domes to be displaced and deformed, forming electrical connections through a conductive ring and disk, and is surrounded by anti-tamper meshes and case open switch assemblies for enhanced security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional key contact mechanisms are used, then the device structure is simple, but the device lacks effective anti-tampering measures and secure electrical connections
Solution Approach 1:
The patent implements nested protective structures where anti-tamper meshes are positioned between the key contact array and the dome array, and additional anti-tamper meshes surround the protrusion array. These nested layers create multiple barriers that must be penetrated to access internal components, significantly enhancing security without requiring a complete redesign of the device architecture.
Solution Approach 2:
The key contact array is divided into multiple isolated contact pairs, each surrounded by its own anti-tamper mesh. This segmentation prevents unauthorized access to individual contact points and ensures that tampering with one contact pair does not compromise the entire system. Each segment operates independently with its own protective enclosure.
2Reliability
If simple key depression mechanisms are used, then the device is easy to manufacture, but the key depression mechanism is not efficient or reliable
Solution Approach 1:
The patent employs dome-shaped elements with specific curvature characteristics. The domes are configured to deform in a predictable manner when pressed, ensuring reliable electrical contact. The curved geometry of the domes and protrusions facilitates smooth deformation and recovery, improving key depression reliability while maintaining manufacturing feasibility through standard forming processes.
Solution Approach 2:
The patent optimizes physical parameters such as dome thickness, protrusion height, and material properties to achieve reliable key depression response. By carefully controlling these parameters, the system ensures that each key press reliably actuates the corresponding contact pair while maintaining ease of manufacture through standardized component specifications.
3Reliability
If multiple protective layers are added, then anti-tampering protection is enhanced, but the device complexity increases
Solution Approach 1:
The anti-tamper meshes serve multiple functions simultaneously: they provide physical barriers against tampering, act as structural support elements, and maintain the structural integrity of the protective enclosures. This multi-functionality reduces the need for additional separate components, thereby enhancing security while limiting the increase in overall device complexity.
Solution Approach 2:
The patent merges the protective enclosure structure with the anti-tamper meshes, integrating security features into the existing device architecture rather than adding separate protective systems. The meshes are incorporated into the housing structure, combining mechanical protection and anti-tampering functions in a unified design that minimizes complexity increases.
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 provides a secure and reliable data entry mechanism with enhanced anti-tampering protection, ensuring secure electrical connections and sensitive information protection against unauthorized access.
Implementation Method 1
depression of one of the plurality of keys of the keypad array causes a corresponding one of the domes of the dome array to be displaced downwardly and to be deformed by pushing engagement with a corresponding one of the protrusions of the protrusion array
Data Source
AI summary
A key entry device including a housing, a keypad array disposed within the housing and including a plurality of keys, a key contact array disposed within the housing below the keypad array and including a plurality of contact pairs, a dome array underlying the keypad array and the key contact array and including a plurality of domes, and a protrusion array underlying the dome array and including a plurality of protrusions, whereby depression of one of the plurality of keys of the keypad array causes a corresponding one of the domes of the dome array to be displaced downwardly and to be deformed by pushing engagement with a corresponding one of the protrusions of the protrusion array into contact with at least one of the contact pairs of the key contact array.