Force Sensing Device With Elastic Pressure Member
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Solution Overview
Problem
Existing force sensing devices in portable terminal devices face challenges in maintaining consistent sensing efficiency due to assembly and manufacturing tolerances, leading to variable distances between force sensors and pressing surfaces, which affects input signal recognition and sensitivity.
Innovation Solution
A force sensing device design that includes a sensor support portion with force sensors, a frame, and an elastic pressure applying member, which spaces the frame apart from the sensor support portion, maintaining a constant distance and improving sensing sensitivity by applying pressure to the sensor support portion without directly opposing the force sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If force sensors are disposed close to the pressing surface to improve sensing sensitivity, then sensing sensitivity is improved, but assembly and manufacturing tolerances cause variable distances that affect input signal recognition
Solution Approach 1:
The patent introduces a sensor support portion as an intermediary component between the force sensor and the pressing surface. This support portion includes a support plate and support projections that maintain a constant distance between the force sensor sensing surface and the pressing surface, eliminating the need for precise direct positioning and compensating for assembly and manufacturing tolerances.
Solution Approach 2:
The support projections are pre-positioned on the sensor support portion to establish a predetermined constant distance from the force sensor sensing surface to the pressing surface. This preliminary positioning ensures consistent sensing conditions before the device is assembled and operated, preventing distance variability caused by tolerances.
2Force
If pressure is applied directly to the sensor support portion opposite the force sensors, then pressure application is effective, but the distance between force sensors and pressing surfaces becomes inconsistent
Solution Approach 1:
The patent applies pressure locally to specific regions of the sensor support portion that do not interfere with the force sensor positioning. The support projections are strategically positioned to receive pressure while maintaining the constant distance between the force sensor sensing surface and the pressing surface, allowing effective pressure application without compromising distance consistency.
3Volume of moving object
If the frame is disposed close to the sensor support portion to reduce device size, then device compactness is improved, but sensing sensitivity is reduced due to insufficient pressure application
Solution Approach 1:
The patent optimizes the spatial arrangement by utilizing the vertical dimension between the frame and sensor support portion. The constant distance maintained by the support projections allows the frame to be positioned closer to the sensor support portion in the horizontal plane, reducing device footprint, while the vertical pressure transmission path remains intact for effective force sensing.
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
Enhances sensing sensitivity and maintains consistent distance between force sensors and pressing surfaces, improving input signal recognition and overall force sensing efficiency.
Implementation Method 1
an elastic pressure applying member, which spaces the frame apart from the sensor support portion, maintaining a constant distance and improving sensing sensitivity by applying pressure to the sensor support portion
Data Source
AI summary
A force sensing device includes: a sensor support portion; at least one force sensor disposed on a first surface side of the sensor support portion; a frame disposed on a second surface side of the sensor support portion and spaced apart from the sensor support portion; and a pressure applying member disposed between the sensor support portion and the frame, and configured to apply pressure to the sensor support portion.