Sensor Element Side Surface Wiring for Multi-Axis Force Detection
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Solution Overview
Problem
Existing force detecting devices face challenges in reducing size due to the need for wire arrangements, which leads to increased space requirements and detection losses in force measurement.
Innovation Solution
The solution involves forming a wiring layer on the side surface of the sensor element, allowing electrodes for different axes to overlap and connect externally, reducing the need for internal wire arrangement and enhancing charge detection accuracy by using piezoelectric substrates with specific cut orientations and a housing container for protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wires are connected to signal electrodes to extract charges for arithmetic calculation, then charge detection function is achieved, but wiring space increases and device size cannot be reduced
Solution Approach 1:
The patent transitions from planar wire routing to three-dimensional wiring by forming wiring layers on the side surfaces of the sensor element. Multiple wiring layers are stacked vertically along the thickness direction, allowing wires to be routed in the vertical dimension rather than only on the surface, thereby reducing planar wiring space while maintaining all necessary electrical connections.
Solution Approach 2:
The wiring structure is nested within the sensor element body itself. The wiring layers are formed on the side surfaces and extend into the thickness direction, effectively nesting the wiring system within the existing sensor geometry. This eliminates the need for separate external wiring spaces and allows the wires to be contained within the sensor's own structural envelope.
2Ease of operation
If wires are drawn around to the arithmetic unit, then charge extraction is enabled, but device complexity increases
Solution Approach 1:
The wiring system is segmented into multiple discrete wiring layers formed on different side surfaces of the sensor element. Each wiring layer handles specific connections, and the segments are independently formed and positioned. This segmentation allows for modular assembly and simplifies the overall wiring architecture by dividing the complex routing task into manageable sections that can be formed systematically.
Solution Approach 2:
The sensor element structure itself serves the wiring function. By forming wiring layers on the side surfaces and extending them into the thickness direction, the sensor element's own geometry provides the wiring pathways. This self-service approach eliminates the need for separate external wiring structures and reduces overall device complexity by integrating the wiring function into the sensor body.
3Area of stationary object
If electrodes for different axes are arranged to overlap, then wiring space is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The wiring layers are formed preliminarily on the side surfaces of the sensor element before final assembly. The wiring structures are pre-positioned and pre-aligned during the manufacturing process, establishing precise spatial relationships before the sensor is fully assembled. This preliminary action allows for controlled precision during manufacturing and simplifies subsequent assembly operations.
Solution Approach 2:
By utilizing the thickness direction as an additional dimension for wiring arrangement, the patent achieves electrode overlap in the planar view without requiring extremely tight lateral alignment. The vertical stacking of wiring layers provides an extra degree of freedom that relaxes the precision requirements for lateral electrode positioning, as connections can be established through vertical routing rather than requiring perfect planar alignment.
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 configuration enables a compact force detecting device with improved accuracy and reliability, capable of detecting forces in multiple axes without internal wiring, thus enhancing the precision and durability of force detection systems.
Implementation Method 1
a first piezoelectric substrate 11 and a second piezoelectric substrate 12 that detect forces in an alpha axis direction and a beta axis direction, respectively, a third piezoelectric substrate 13 that detects a force in a gamma axis direction
Data Source
AI summary
A sensor element is formed by, when an α axis, a β axis orthogonal to the α axis, and a γ axis orthogonal to the α axis and the β axis are set, laminating piezoelectric substrates and electrodes in the γ axis direction. The sensor element includes connecting sections arranged such that a part of external sections of the electrodes aligns with a part of external sections of the piezoelectric substrates. The connecting sections are arranged not to align with one another in a direction of the γ axis. Conductors that electrically connect the connecting sections and external connecting sections are formed along outer peripheral sections of the piezoelectric substrates.