Acceleration Sensor Impact Resistance via Engaging Section
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Solution Overview
Problem
Existing acceleration sensors face damage due to impact constraints, which limit their impact resistance, as the beam section collides with the upper layer support section during external impacts, leading to potential damage.
Innovation Solution
The design includes a support beam with an engaging section where L1 > L2, allowing the weight body to contact the engaging section before the support beam, and optional features like rounded corners or protrusions to disperse impact forces, enhancing impact resistance and productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the beam section is made rigid to maintain structural stability, then the sensor can detect acceleration accurately, but the beam section becomes vulnerable to damage during impact
Solution Approach 1:
The patent introduces a cushioning section between the beam section and the upper layer support section that deforms during impact to absorb shock energy before it reaches the beam section. This beforehand cushioning allows the beam section to maintain its rigid structure for accurate acceleration detection while protecting it from impact damage through the energy-absorbing cushioning mechanism.
2Strength
If the beam section is designed with higher impact resistance, then damage during collision is reduced, but the sensitivity of acceleration detection may decrease
Solution Approach 1:
The patent divides the support structure into distinct functional segments: a rigid beam section for sensitive acceleration detection, a deformable cushioning section for impact absorption, and a fixed upper layer support section. This segmentation allows each part to optimize its properties independently - the beam section maintains high stiffness for detection sensitivity while the cushioning section provides impact resistance without affecting the beam's detection capability.
3Volume of moving object
If the gap between the beam section and upper layer support section is reduced to improve structural compactness, then the sensor size is reduced, but the beam section is more likely to collide with the support section during impact
Solution Approach 1:
The patent introduces a cushioning section as an intermediary element between the beam section and the upper layer support section. This intermediary allows the structure to be compact with reduced gaps while preventing direct collision between the beam and support sections during impact. The cushioning section absorbs impact energy through deformation, eliminating the harmful collision effect while maintaining structural compactness.
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 improves impact resistance and temperature characteristics, reducing damage to the support beam and increasing the sensitivity of acceleration detection, while maintaining or enhancing productivity.
Implementation Method 1
the weight body which is connected to one end portion of the support beam so as to swing in a second direction intersecting the main surface
Implementation Method 2
detect a difference based on the variation of the capacitances between the movable electrodes 505 and two stationary electrode sections 507 and 508
Data Source
AI summary
An acceleration sensor includes a substrate, a support beam, a weight body a stationary section and an engaging section. The weight body is divided into a first weight section and a second weight section based on the support beam as a boundary line, and the first weight section and the second weight section have different weights from each other. The first weight section and the second weight section include a facing section which faces a side of the engaging section opposite to a side facing the support beam. In an X axis direction intersecting the Y axis direction, if a distance between a corner section of the engaging section in the vicinity of one end portion and the support beam is L1 and a distance between the engaging section and the facing section is L2, a relational expression, L1>L2 is satisfied.