Sensor Unit Alignment via Dedicated Protrusion and Abutment
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Solution Overview
Problem
The alignment accuracy of gyro sensors is compromised due to the tolerance issues in the rods used to fix the electrode holder to the base, leading to poor alignment and deteriorated measurement accuracy of physical quantities.
Innovation Solution
A sensor unit design featuring a case with protrusions and an abutment surface that enhances the alignment accuracy of the sensor module by ensuring the separation distances between the abutment surface and protrusions are greater than those between the abutment surface and the inertial sensors, allowing for precise mounting and improved posture stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If multiple rods are used to fix the electrode holder to the base, then the structural stability is improved, but the alignment accuracy deteriorates due to tolerance accumulation
Solution Approach 1:
The patent extracts the alignment function from the rods and concentrates it into a single dedicated alignment structure (the protrusion with abutment surface). This separates the support function (performed by multiple rods) from the alignment function (performed by the single protrusion), eliminating tolerance accumulation in the alignment path while maintaining structural stability through multiple support points.
Solution Approach 2:
The protrusion acts as an intermediary alignment element between the base and the electrode holder. Instead of relying on multiple rods to provide both support and alignment, the protrusion serves as a dedicated mediator that ensures precise alignment, while the rods focus solely on providing structural support.
2Strength
If the electrode holder is fixed using multiple rods, then the support strength is improved, but the measurement precision deteriorates due to shaft inclination
Solution Approach 1:
The patent extracts the alignment function from the support rods and assigns it to a dedicated protrusion structure. This allows the rods to focus on providing support strength while the protrusion ensures the resonator shaft remains perpendicular to the base, preventing measurement errors.
Solution Approach 2:
The patent segments the functions of support and alignment into separate structural elements. The multiple rods handle the support function to provide strength, while the single protrusion handles the alignment function to ensure measurement precision. This functional segmentation resolves the contradiction between support strength and measurement accuracy.
Data Source
AI summary
A sensor unit includes a sensor module and a case having a storage space for storing the sensor module. In addition, the sensor module also includes an inertial sensor and a package for storing the inertial sensor. In addition, the package also includes a bottom surface and a side surface connected to the bottom surface. In addition, the case includes a bottom portion on which a protrusion is disposed, in which the protrusion protrudes into the storage space and includes a mounting surface for the bottom surface of the sensor module to be mounted, and an abutment portion having an abutment surface that abuts the side surface of the sensor module. Further, in plan view of the bottom portion, a separation distance between the abutment surface and the protrusion is longer than a separation distance between the abutment surface and the inertial sensor.