Rotation Angle Detecting Device Stacked IC Packages

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Solution Overview

Problem

Conventional rotation angle detecting devices face issues with sensor characteristic deterioration and accuracy reduction when the stator is eliminated for cost reduction, and there is a risk of signal wire short-circuiting leading to false detection due to adjacent signal output wires.

Innovation Solution

A rotation angle detecting device is designed with plate-shaped IC packages arranged near the rotation axis, eliminating the need for a stator and spacing signal output terminals to prevent short-circuiting, featuring a stacked configuration of IC packages and strategically arranged wires to improve sensor characteristics and detection accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the stator is eliminated for cost reduction, then manufacturing cost is reduced, but sensor characteristics deteriorate and detection accuracy is reduced

Engineering Contradiction:

Improvemanufacturing costVSAvoiddetection accuracy

Core Design Contradiction:

Ease of manufactureVSMeasurement precision

Solution Approach 1:

The patent transitions from a planar arrangement of IC packages to a three-dimensional stacked configuration. Two IC packages are arranged in the thickness direction (stacked) rather than side-by-side on the board surface, allowing both packages to be positioned near the rotation axis without requiring a stator for magnetic field collection.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent combines multiple IC packages containing magnetism detecting elements into a single stacked assembly positioned near the rotation axis. This merging of detection functions into a compact stacked structure eliminates the need for the stator while maintaining good sensor characteristics.

Inventive Principle:

Principle #5Merging (Combining)

2Measurement precision

If two IC packages are arranged side by side in board thickness direction, then sensor characteristics are good, but wires for signal output may be short-circuited due to adjacent positioning

Engineering Contradiction:

Improvesensor characteristicsVSAvoidwire short-circuit risk

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent introduces a terminal arrangement where power supply terminals and ground terminals are positioned between the signal output terminals of the two IC packages. This intermediary terminal configuration acts as a physical barrier and electrical isolation mechanism, preventing direct short-circuiting between signal wires while maintaining good sensor characteristics.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of operation

If wires for signal output are arranged adjacent to each other, then connection is simplified, but signals from two magnetism detecting elements may be mixed together causing false detection

Engineering Contradiction:

Improvewire connection simplicityVSAvoidrotation angle detection accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent uses power supply terminals and ground terminals as intermediary elements positioned between the signal output terminals. This arrangement maintains electrical isolation between signal lines while allowing for simplified connection structures, preventing signal mixing that would cause false rotation angle detection.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent segments the terminal functions by separating signal output terminals from power supply and ground terminals. This functional segmentation creates natural electrical isolation between signal lines, preventing mixing of signals from different magnetism detecting elements while maintaining connection simplicity.

Inventive Principle:

Principle #1Segmentation

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

The solution enhances sensor characteristics and detection accuracy while reducing manufacturing costs by eliminating the stator and preventing signal mixing, thus minimizing false angle detection.

Implementation Method 1

a first magnetism detecting element configured to output a signal in accordance with intensity of a magnetic field therearound, and a second magnetism detecting element configured to output a signal in accordance with intensity of a magnetic field therearound

Methodology Applied

Scientific EffectMagnetic field detection: Magnetic Field

Data Source

PatentUS9163956B2Rotation angle detecting device and rotary drive unit by use thereof

Publication Date: 2015.10.20 DENSO CORP

AI summary

In a rotation angle detecting device, a signal from a first magnetism detecting element is outputted to a signal output part of a first IC package. A first signal output terminal outputs the signal from the first magnetism detecting element to outside. A signal from a second magnetism detecting element is outputted to a signal output part of a second IC package. A second signal output terminal outputs the signal from the second magnetism detecting element to outside. At least one of a power supply terminal and a ground terminal is located between the first and second signal output terminals. A rotary drive unit includes the device, a motor that rotates a detection object, and a motor power source wire. The ground terminal and a motor power source terminal are adjacent to each other.