Gyro Sensor Fixed Section Inversion for Sensitivity

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Solution Overview

Problem

Existing gyro sensors with rotary drive vibration have a short rotation radius for mass elements, leading to decreased displacement of in-plane turning motion and reduced detection sensitivity.

Innovation Solution

The gyro sensor design includes a substrate, a fixed section, a mass section, a driving section, a detecting section capable of turning and displacing by a Coriolis force, and elastic sections coupling the detecting section and the fixed section. The fixed section is strategically positioned between the center of gravity of the detecting section and the mass section, allowing the elastic sections to be oriented away from the mass section, thereby increasing the rotation radius and displacement of the detecting section.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If the elastic springs extend from the fixed section toward the driving actuator, then the structure is compact, but the rotation radius of the mass elements becomes short

Engineering Contradiction:

Improvestructural compactnessVSAvoidrotation radius

Core Design Contradiction:

Volume of moving objectVSLength of moving object

Solution Approach 1:

The patent inverts the conventional arrangement by positioning the fixed section between the mass section and the detecting section, rather than having the detecting section between the mass section and fixed section. This inversion extends the rotation radius while maintaining structural compactness.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent changes the spatial arrangement from a linear configuration to a two-dimensional layout where the fixed section is positioned at a strategic location that allows the elastic springs to extend in a direction that maximizes the rotation radius without increasing overall structural volume.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Volume of moving object

If the rotation radius of mass elements is short, then the structure is compact, but the displacement amount of in-plane turning motion decreases

Engineering Contradiction:

Improvestructural compactnessVSAvoiddisplacement amount

Core Design Contradiction:

Volume of moving objectVSLength of stationary object

Solution Approach 1:

By inverting the positions of the fixed section and detecting section, the patent enables the mass elements to achieve larger displacement amounts during in-plane turning motion while keeping the overall structure compact.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent changes the geometric parameters of the system by repositioning the fixed section, which alters the rotation radius and displacement characteristics of the mass elements to optimize detection sensitivity.

Inventive Principle:

Principle #35Parameter changes

3Volume of moving object

If the rotation radius is short, then the structure is compact, but the detection sensitivity deteriorates

Engineering Contradiction:

Improvestructural compactnessVSAvoiddetection sensitivity

Core Design Contradiction:

Volume of moving objectVSMeasurement precision

Solution Approach 1:

The patent resolves the contradiction between structural compactness and detection sensitivity by inverting the arrangement of components, specifically placing the fixed section between the mass section and detecting section to maximize the rotation radius and Coriolis force effect.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent utilizes a two-dimensional spatial arrangement to achieve both compactness and high detection sensitivity by optimizing the positions of the fixed section, mass section, and detecting section in the planar configuration.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 enhances the detection sensitivity of the gyro sensor by increasing the displacement amount of the in-plane turning motion and the Coriolis force-induced displacement, while also dispersing stress concentration and improving reliability.

Implementation Method 1

a Coriolis force is applied to the mass elements according to speed and a displacement amount of the in-plane turning motion

Methodology Applied

Scientific EffectCoriolis force: Coriolis Force

Implementation Method 2

The elastic springs allow an in-plane turning motion centering on the fixed section and, at the same time, have a function of a torsion spring

Methodology Applied

Scientific EffectElastic potential energy: Elasticity

Data Source

PatentUS12313407B2Gyro sensor, electronic device, and vehicle

Publication Date: 2025.05.27 SEIKO EPSON CORP

AI summary

A gyro sensor includes a substrate, a fixed section fixed to the substrate, a driving section configured to perform driving along an X axis parallel to a principal plane of the substrate, a mass section coupled to the driving section and displaced along the X axis, a detecting section coupled to the mass section, capable of turning around a Z axis crossing the X axis, and capable of being displaced along the Z axis by a Coriolis force acting on a turning motion horizontal to the substrate, and an elastic section coupling the detecting section and the fixed section. The fixed section is disposed between the center of gravity of the detecting section and the mass section in a plan view.