Angular Velocity Sensor Symmetrical Detector Cancellation

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Solution Overview

Problem

Conventional angular velocity sensors fail to accurately detect angular velocity due to undesired signals from external disturbances like acceleration or impact, as they lack symmetrical detector elements with respect to the X and Y axes.

Innovation Solution

The angular velocity sensor design includes a support body, retaining portions, weights, arms, a drive unit, and a detector unit with detector elements that are symmetrical with respect to both the X and Y axes, allowing for the cancellation of undesired signals by detecting and processing signals in a way that phases of components attributed to drive vibrations, angular velocities, and accelerations cancel each other out.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional angular velocity sensor uses non-symmetrical detector elements, then device complexity is reduced, but measurement precision deteriorates due to undesired signals from external disturbances

Engineering Contradiction:

Improveangular velocity detection accuracyVSAvoiddetector element configuration

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent applies asymmetry principle by configuring detector elements in a specific symmetrical pattern (with respect to X and Y axes) rather than using a completely symmetrical arrangement. This selective asymmetry allows the detector to distinguish between Coriolis forces (desired signal) and external disturbances (undesired signals), thereby improving measurement precision while maintaining manageable device complexity

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The detector unit is segmented into multiple detector elements positioned at specific locations around the vibrating structure. Each detector element measures displacement at its specific position, and the combined signals from these segmented detectors enable differentiation between desired and undesired signals through signal processing

Inventive Principle:

Principle #1Segmentation

2Reliability

If angular velocity sensor uses symmetrical detector elements with respect to X and Y axes, then measurement precision improves by canceling undesired signals, but device complexity increases

Engineering Contradiction:

Improvesignal accuracyVSAvoiddetector element arrangement

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent employs a specific symmetrical arrangement of detector elements that is symmetrical with respect to both the X-axis and the Y-axis. This controlled symmetry enables the system to cancel out undesired signals from external disturbances while maintaining reliability in angular velocity detection

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The symmetrical detector element configuration serves multiple functions: it detects both the desired Coriolis forces and the undesired external disturbances, and through signal processing, it enables cancellation of the undesired signals. This multi-functionality improves reliability without requiring separate systems for different detection purposes

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 enables accurate detection of angular velocity by effectively canceling out undesired signals from external disturbances, ensuring precise measurement of angular velocities about multiple axes.

Implementation Method 1

drive unit for driving the first to fourth arms to vibrate the arms in a direction of the X-axis

Methodology Applied

Scientific EffectVibration: Vibration

Implementation Method 2

detector elements for detecting displacements of the arms in the Y-axis direction or in the Z-axis direction

Methodology Applied

Scientific EffectPosition detection:

Implementation Method 3

monitor element for detecting displacements of the arms in the direction of X-axis

Methodology Applied

Scientific EffectPosition detection:

Implementation Method 4

phases of components attributed to drive vibrations, angular velocities, and accelerations cancel each other out

Methodology Applied

Scientific EffectPhase cancellation:

Data Source

PatentUS8991248B2Angular velocity sensor

Publication Date: 2015.03.31 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

An angular velocity sensor includes a support body, a retaining portion connected to the support body, first to fourth weights, first to fourth arms, a drive unit for driving the first to fourth arms, and a monitor unit for detecting displacements of the first to fourth arms. An X-axis, a Y-axis, and a Z-axis that are perpendicular to each other are defined. The detector unit is symmetrical with respect to both an axis parallel to the X-axis and an axis parallel to the Y-axis. This angular velocity sensor can cancel an undesired signal caused by external disturbances, such as acceleration or impact, thus detecting an angular velocity accurately.