Electronic Device Opening Deformation for Pressure Sensing
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Solution Overview
Problem
Physical keys on electronic devices protruding out of in-out holes can lead to aesthetic deterioration and unintended key presses, causing operational malfunctions due to decreased dome switch elasticity from repeated use.
Innovation Solution
An electronic device design featuring a sensor assembly on the outer surface to sense pressure applied to input areas, with strategically placed openings and a bridge to concentrate pressure and enhance rigidity, eliminating the need for physical keys.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If physical keys protrude out of in-out holes to enable key input, then key functionality is achieved, but aesthetic appearance deteriorates and unintended key presses occur
Solution Approach 1:
The patent extracts the key input function from the protruding physical key structure and relocates it to a recessed sensor assembly. The sensor assembly is positioned within an indentation in the housing surface, eliminating the protrusion while maintaining the ability to detect user input through pressure changes on the sensor surface.
Solution Approach 2:
The patent replaces the mechanical dome switch system with a pressure sensor assembly that detects key input through electrical or optical pressure sensing. This substitution eliminates the need for protruding mechanical keys while maintaining input functionality, and the sensor can be integrated flush with the housing surface for improved aesthetics.
2Ease of operation
If physical keys are repeatedly pressed for long period, then input function is maintained, but dome switch elasticity decreases leading to operational malfunction
Solution Approach 1:
The patent replaces the mechanical dome switch with a pressure sensor that measures applied force through electrical or optical principles. This eliminates the elasticity degradation issue inherent in mechanical springs, as the sensor can continuously measure pressure without wearing out, ensuring long-term reliable operation.
Solution Approach 2:
The patent changes the detection parameter from mechanical displacement (dome switch deflection) to pressure measurement. The pressure sensor detects the magnitude of applied force directly, providing a more reliable and durable input mechanism that does not suffer from elastic fatigue over time.
3Measurement precision
If sensor assembly is placed close to input area for direct pressure sensing, then sensitivity is improved, but structural rigidity may be compromised
Solution Approach 1:
The patent segments the housing structure into distinct functional zones: the sensor assembly is positioned in a localized region with appropriate flexibility for pressure detection, while the surrounding housing structure maintains its rigidity for structural support. This spatial segmentation allows each component to optimize its function without compromising the other.
Solution Approach 2:
The patent applies different mechanical properties to different regions of the housing. The area containing the sensor assembly has localized flexibility to accommodate pressure sensing, while the rest of the housing maintains high rigidity for structural integrity. This local differentiation allows the sensor to be sensitive to pressure without compromising overall device strength.
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
Improves the aesthetic appearance, reduces unintended key presses, and enhances the sensitivity and durability of the device by concentrating pressure on the sensor assembly and preventing bending.
Implementation Method 1
a sensor assembly including at least one pressure sensor disposed on an inner surface of the housing facing a second direction opposite the first direction, the sensor assembly configured to sense pressure applied to the at least one input area
Implementation Method 2
the at least one first opening and the second opening are configured to be deformed based on the pressure applied to the at least one input area
Data Source
Figure 1
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Figure 4
AI summary
An electronic device according to various embodiments includes: a housing; at least one input area disposed on an outer surface of the housing and facing a first direction; a sensor assembly including at least one pressure sensor disposed on an inner surface of the housing facing a second direction opposite the first direction, and configured to sense pressure applied to the input area; at least one first opening provided at a first portion of the housing adjacent to the sensor assembly; and a second opening provided at a second portion of the housing spaced apart from the first opening in the second direction, wherein the first opening and the second opening are configured to be deformed based on the pressure that is applied to the input area.