Image Shake Correction Device with Localized Circuit Density

Solution Overview

Problem

Existing image shake correction devices require increased power to maintain the imager at a reference position due to the weight of the movable unit, reducing the usable time of imaging devices.

Innovation Solution

An image shake correction device with a movable member supported to move in multiple directions, a circuit board with magnetic elements on its rear surface, and position detectors to detect movement via magnetic field changes, reducing power consumption by optimizing the distribution of circuit elements and magnetic fields.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the movable unit including the circuit board is made heavier to improve structural stability, then the image shake correction function is maintained, but the power required to hold the movable unit at the reference position increases

Engineering Contradiction:

Improvestructural stabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent applies local quality by creating a high-density region of circuit elements around the first region (which overlaps with the magnet) and a low-density region in other areas. This non-uniform distribution optimizes the magnetic field interaction locally where it is most needed for position detection, while reducing unnecessary circuit elements elsewhere to minimize power consumption and overall weight.

Inventive Principle:

Principle #3Local quality

2Reliability

If the movable unit including the circuit board is made heavier to improve structural stability, then the image shake correction function is maintained, but the usable time of the imaging device is shortened

Engineering Contradiction:

Improvestructural stabilityVSAvoidusable time

Core Design Contradiction:

ReliabilityVSDuration of action of moving object

Solution Approach 1:

The patent applies local quality by creating a high-density region of circuit elements around the first region (which overlaps with the magnet) and a low-density region in other areas. This non-uniform distribution optimizes the magnetic field interaction locally where it is most needed for position detection, while reducing unnecessary circuit elements elsewhere to minimize power consumption and overall weight.

Inventive Principle:

Principle #3Local quality

3Ease of manufacture

If circuit elements are uniformly distributed on the circuit board, then manufacturing is simplified, but the magnetic field detection precision for position detection is reduced

Engineering Contradiction:

Improvecircuit board fabricationVSAvoidposition detection precision

Core Design Contradiction:

Ease of manufactureVSMeasurement precision

Solution Approach 1:

The patent applies local quality by creating a high-density region of circuit elements around the first region (which overlaps with the magnet) and a low-density region in other areas. This non-uniform distribution optimizes the magnetic field interaction locally where it is most needed for position detection, while reducing unnecessary circuit elements elsewhere to minimize power consumption and overall weight.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent uses magnetic field lines as an intermediary to detect the position of the movable unit. The circuit elements with magnetic materials interact with the magnetic field supplied by the magnet, and changes in the magnetic field are detected to determine position. This intermediary approach enables precise position detection without direct mechanical contact or complex sensing mechanisms.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 effectively reduces power consumption by minimizing the power needed to hold the imager at a reference position, thereby extending the usable time of imaging devices.

Implementation Method 1

a plurality of position detectors that is fixed to a rear surface opposite to a surface of the circuit board on which the imager is mounted to detect a position of the movable member in a movement direction of the movable member by a change of a magnetic field supplied from the rear surface side of the circuit board

Methodology Applied

Scientific EffectMagnetic field: Magnetic Field

Data Source

PatentUS10859848B2Image shake correction device and imaging device

Publication Date: 2020.12.08 FUJIFILM CORP

AI summary

An image shake correction device includes: a movable member that is supported to be movable in plural directions along a flat surface; a circuit board that is fixed to the movable member; an imager that is mounted on the circuit board; and plural position detectors fixed to a rear surface of the circuit board opposite to a surface of the circuit board on which the imager is mounted to detect a position of the movable member in a movement direction of the movable member by a change of a magnetic field supplied from the rear surface side of the circuit board, plural circuit elements including magnetic materials is formed on the rear surface of the circuit board, and a high-density region is formed in a second region as defined herein.