MEMS Beam Security for Solid-State Electronics
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Solution Overview
Problem
Solid-state devices, such as processors and memory chips, rely solely on software-based security methods that are vulnerable to hacking, leading to potential data loss when misplaced or stolen.
Innovation Solution
Incorporating microelectromechanical (MEMS) beams that are electrostatically actuated to short-circuit or unlock microcircuitry, using a two-step voltage signal to deflect beams away from conductors, thereby securing data access and preventing unauthorized access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If software-based security protocols and passwords are used to secure data on solid-state devices, then data access control is enabled, but the system becomes vulnerable to hacking and unauthorized access
Solution Approach 1:
The patent replaces software-based security mechanisms with a mechanical security system using MEMS beams that physically short-circuit conductors to prevent unauthorized access. The beams are electrostatically actuated to make or break electrical contacts, providing hardware-level security that cannot be bypassed by software hacking methods.
Solution Approach 2:
The security system divides the device into functionally isolated segments using suspended MEMS beams that can independently control access to different conductors and circuit regions. Each beam operates as an independent security gate, allowing granular control over which parts of the microcircuitry are accessible.
2Object-affected harmful factors
If MEMS beams are used to mechanically lock microcircuitry by short-circuiting conductors, then unauthorized access is prevented, but device complexity increases
Solution Approach 1:
The patent uses thin-film MEMS beams fabricated using standard semiconductor manufacturing processes. These beams are suspended over conductors and can be electrostatically actuated to contact or disconnect from the conductors below, providing a compact mechanical security structure that integrates seamlessly with existing microcircuitry without requiring bulky mechanical components.
Solution Approach 2:
The MEMS beams serve as intermediary elements between the control circuitry and the protected conductors. The beams are electrostatically actuated by control signals to physically make or break electrical connections, providing a mechanical mediation layer that prevents unauthorized access while maintaining controlled access for authorized operations.
3Reliability
If beams are suspended to short-circuit conductors for security, then data protection is enhanced, but manufacturing precision requirements increase
Solution Approach 1:
The MEMS beams are designed to self-align with the conductors below through electrostatic attraction forces. When actuated, the beams naturally position themselves to make contact with the conductors, eliminating the need for extremely tight manufacturing tolerances. The electrostatic field guides the beam to its contact position, providing self-correcting alignment that reduces manufacturing precision requirements.
Solution Approach 2:
The patent utilizes changes in electrostatic field parameters (voltage, capacitance) to control beam positioning and contact. By adjusting the electrostatic actuation parameters, the system can achieve reliable contact between beams and conductors without requiring sub-micron manufacturing precision, as the electrical parameters compensate for physical variations.
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
This mechanical security system effectively prevents unauthorized access and data loss by using MEMS beams to lock or unlock solid-state devices, even if they are misplaced or stolen, without relying on software-based solutions.
Implementation Method 1
one or more beams each suspended from the beam substrate and in contact with, and short-circuiting, the conductors to thereby prevent operation of the microcircuitry, wherein each beam is responsive to an unlocking signal to deflect away from, and out of contact with, the conductors
Data Source
AI summary
In accordance with various embodiments of the present invention, mechanical systems incorporating movable microelectromechanical (MEMS)-based features, e.g., cantilevers or suspended micron- and submicron-scale beams are utilized to secure solid-state devices such as controllers, microcontrollers, central processing units (CPUs), solid-state storage drives, and memory cards. In various embodiments of the invention, the beams are double-clamped, initially curved (or “pre-buckled”) segments that are provided within the solid-state device (e.g., on the top layer thereof) prior to encapsulation and packaging of the device.