Physical Quantity Sensor Weight Structure for Stable Sensitivity
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Solution Overview
Problem
Existing physical quantity detection devices face issues with weight portions being inclined and fixed improperly, leading to adhesion and variation in detection sensitivity due to improper fixation methods.
Innovation Solution
A physical quantity sensor design featuring a base portion, a support portion, a plate-shaped movable portion with a hinge, a physical quantity detection element, and a weight with recessed portions to ensure balanced fixation, preventing inclination and maintaining detection sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the weight portion is fixed to the movable portion using conventional fixation methods, then the weight portion can be attached to the movable portion, but the weight portion becomes inclined and deviated from the first direction, causing adhesion and deterioration in detection sensitivity
Solution Approach 1:
A fixture is introduced as an intermediary tool during the fixation process. The fixture holds the weight portion in the correct position and orientation, preventing inclination and deviation while the adhesive sets. This mediator ensures precise alignment without requiring complex fixation methods or skilled manual operation.
Solution Approach 2:
The weight portion is pre-positioned and clamped in the correct orientation using the fixture before the adhesive is applied and before the curing process begins. This preliminary positioning action ensures that the weight portion is already aligned correctly with the first direction before fixation occurs, preventing adhesion and alignment issues.
2Ease of manufacture
If the weight portion is fixed using conventional methods, then fixation can be achieved, but detection sensitivity varies due to inclination and adhesion
Solution Approach 1:
The fixture serves as a mediator that maintains the weight portion's correct orientation during the entire fixation process. By preventing contact between the weight portion and surrounding surfaces, the fixture eliminates adhesion issues that would otherwise cause variation in detection sensitivity.
Solution Approach 2:
The correct positioning and orientation of the weight portion is established in advance using the fixture, before any adhesive is applied. This preliminary action ensures that when the fixation is complete, the weight portion is already in the precise position needed for consistent detection sensitivity.
3Ease of operation
If the weight portion is sandwiched by tweezers or similar tools for fixation, then the weight portion can be positioned, but inclination and deviation from the first direction occur
Solution Approach 1:
Instead of using tweezers or similar gripping tools that can cause inclination, a specialized fixture is used as an intermediary. The fixture is designed with features that naturally guide and hold the weight portion in the correct orientation, making positioning easy while ensuring precise alignment with the first direction.
Solution Approach 2:
The fixture is designed to pre-position the weight portion in the correct orientation before fixation occurs. The fixture's structure inherently guides the weight portion into proper alignment, eliminating the need for manual adjustment and preventing inclination during the positioning operation.
Data Source
AI summary
A physical quantity sensor 10 includes a base portion 21, a support portion 22 that supports the base portion 21, a plate-shaped movable portion 24 extending in one direction from the base portion 21 via a hinge portion 23, a physical quantity detection element 40 bonded to the base portion 21 and the movable portion 24 across the hinge portion 23, a package 50 that supports the support portion 22 in a fixed region 25, and a weight 30 having a pair of recessed portions 32 recessed toward a center of gravity 80 of a weight portion 31 when viewed in a direction perpendicular to a main surface 24a of the movable portion 24.