Physical Quantity Detector Extending Part Impact Absorption

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Solution Overview

Problem

Existing physical quantity detection devices face issues with breakage when subjected to excessive forces due to the displacement and impact of weights attached to cantilevers, which can lead to frame breakage and reduced sensitivity.

Innovation Solution

The design incorporates a substrate with a base section, movable part, support sections, and extending parts where the weight overlaps the extending part in a planar view, allowing the extending part to deflect and absorb the impact, preventing frame breakage and maintaining high sensitivity. The extending part is thicker than the support section, and may have recessed parts or a rough joining surface to enhance deflection and joining strength.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the weight is made heavier to increase output sensitivity, then the sensitivity is improved, but the displacement of the weight becomes large and causes breakage of the frame part

Engineering Contradiction:

Improveoutput sensitivityVSAvoidframe part strength

Core Design Contradiction:

Measurement precisionVSStrength

Solution Approach 1:

The extending part serves as an intermediary element between the weight and the frame part. It has a cantilever structure that allows it to absorb the displacement and impact of the weight through controlled deflection, preventing direct transmission of harmful forces to the frame part while still allowing the weight to function for sensitivity enhancement

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The extending part is positioned beforehand to overlap with the weight in the planar view, creating a protective buffer zone. This preemptive structural arrangement ensures that when the weight displaces due to excessive physical quantity or increased mass, the extending part is already in place to absorb the impact before it can reach and break the frame part

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

2Reliability

If the weight is made to contact the frame part to prevent cantilever breakage, then the cantilever protection is improved, but the frame part breakage occurs due to weight impact

Engineering Contradiction:

Improvecantilever protectionVSAvoidframe part strength

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The extending part acts as a mediator between the weight and the frame part. Instead of allowing direct contact between the weight and the frame part (which causes breakage), the extending part intercepts the weight's displacement path and absorbs the impact through its cantilever deflection, protecting both the cantilever and the frame part

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The extending part converts the harmful impact force into a beneficial deflection of the cantilever structure. The displacement that would otherwise be harmful to the frame part is instead used to deflect the extending part in a controlled manner, dissipating energy and protecting the overall structure

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 effectively suppresses the displacement and impact of the weight, preventing frame breakage and enhancing the sensitivity of the physical quantity detector, making it suitable for applications in electronic apparatuses and vehicles.

Implementation Method 1

force acts in a detection axis direction to thereby make the resonance frequency of the physical quantity detection device vary

Methodology Applied

Scientific EffectResonance: Resonance

Implementation Method 2

the extending part has a cantilever structure, even if the weight has contact therewith, the extending part is deflected in the displacement direction of the weight

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS10677813B2Physical quantity detector, physical quantity detection device, electronic apparatus, and vehicle

Publication Date: 2020.06.09 SEIKO EPSON CORP

AI summary

A physical quantity detector according to the invention includes a substrate section including a base section, a movable part connected to the base section, a support section extending from the base section, an extending part extending from the support section, and a physical quantity detection element fixed to the base section and the movable part, and a weight fixed to the movable part, and the extending part and the weight overlap each other in a planar view from the thickness direction of the extending part.