Piezoelectric Camera Actuator Reducing Magnetic Interference

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Solution Overview

Problem

The increasing performance of camera modules in portable electronic devices leads to magnetic field interference between hand shake prevention units and other drivers, and a rise in driving voltage, which existing technologies fail to adequately address.

Innovation Solution

A camera actuator design incorporating piezoelectric members and friction pads to move the lens module along perpendicular directions, reducing friction and electromagnetic interference, and utilizing rolling members to minimize contact and electromagnetic forces, thus preventing magnetic field interference and lowering driving voltage requirements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional actuators are used for hand shake prevention, then image stabilization is achieved, but magnetic field interference occurs between the actuator and other drivers

Engineering Contradiction:

Improveimage stabilizationVSAvoidmagnetic field interference

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent replaces the conventional electromagnetic actuator with a piezoelectric actuator. The piezoelectric member converts electrical signals directly into mechanical motion through piezoelectric effect, eliminating the electromagnetic fields that cause interference with other drivers. This substitution maintains the hand shake prevention function while removing the harmful magnetic field emissions.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent extracts and removes the electromagnetic components (coils, magnets) from the actuator system, retaining only the piezoelectric element. By taking out the source of magnetic field generation, the design eliminates the interference problem while preserving the essential actuation function for image stabilization.

Inventive Principle:

Principle #2Taking out (Extraction)

2Force

If conventional actuators with electromagnetic components are used, then driving force is generated, but driving voltage increases

Engineering Contradiction:

Improvedriving forceVSAvoiddriving voltage

Core Design Contradiction:

ForceVSUse of energy by moving object

Solution Approach 1:

The patent changes the fundamental operating parameters of the actuator by using piezoelectric materials that respond to voltage through direct mechanical deformation. This parameter change allows the actuator to generate sufficient driving force at lower voltage levels compared to conventional electromagnetic actuators, thereby reducing the driving voltage requirement while maintaining necessary actuation force.

Inventive Principle:

Principle #35Parameter changes

3Volume of moving object

If the camera module size is reduced, then portable electronic devices become thinner, but hand shake effects increase

Engineering Contradiction:

Improvecamera module sizeVSAvoidhand shake effects

Core Design Contradiction:

Volume of moving objectVSObject-affected harmful factors

Solution Approach 1:

The patent applies a piezoelectric actuator that provides precise and rapid response to hand shake movements. The piezoelectric material's ability to convert electrical signals into precise mechanical displacements enables effective compensation for hand shake effects even in compact camera modules, maintaining image quality without requiring larger device dimensions.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 camera actuator effectively reduces magnetic field interference and decreases the driving voltage needed, enhancing image stabilization and performance while maintaining low electromagnetic interference.

Implementation Method 1

a first actuator disposed between the lens module and the guiding unit, including a first piezoelectric member

Methodology Applied

Scientific EffectPiezoelectric effect: Piezoelectric Effect

Implementation Method 2

a first rolling member disposed between the lens module and the guiding unit

Methodology Applied

Scientific EffectRolling friction: Roller

Data Source

PatentUS20240210792A1Camera actuator

Publication Date: 2024.06.27 SAMSUNG ELECTRO MECHANICS CO LTD

AI summary

A camera actuator includes a lens module including a plurality of lenses, a carrier accommodating the lens module, a guiding unit disposed between the lens module and the carrier, a housing accommodating the carrier, a first actuator disposed between the lens module and the guiding unit, including a first portion attached to the guiding unit, and moving the lens module along a first direction perpendicular to an optical axis of the plurality of lenses, and a second actuator disposed between the guiding unit and the carrier, including a second portion attached to the guiding unit, and moving the lens module along a second direction perpendicular to the optical axis.