Optical Image Stabilization Actuator Moving Sensor Perpendicular to Optical Axis

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Solution Overview

Problem

Existing camera modules face challenges in precisely controlling the driving force for optical image stabilization due to the weight of the driving unit, making it difficult to achieve precise image stabilization.

Innovation Solution

An optical image stabilization actuator is designed with a fixed frame, a moving frame, a ball member, and a driving unit comprising magnets and coils, along with a sensor substrate and yokes, which allows the image sensor to move in directions perpendicular to the optical axis, enabling precise stabilization without the need to move the lens module.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the lens module is moved for optical image stabilization, then shake correction is achieved, but the weight of the driving unit makes precise control of driving force difficult

Engineering Contradiction:

Improveoptical image stabilization performanceVSAvoidweight of driving unit

Core Design Contradiction:

ReliabilityVSWeight of moving object

Solution Approach 1:

Instead of moving the lens module for optical image stabilization, the patent inverts the approach by moving the image sensor in directions perpendicular to the optical axis. This inversion transfers the stabilization function from the lens assembly to the sensor assembly, resolving the contradiction by eliminating the need to move the heavy lens module while still achieving shake correction.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent extracts the optical image stabilization function from the lens module and relocates it to the image sensor assembly. By separating the stabilization function from the lens driving mechanism, the heavy lens module remains stationary while the lighter image sensor carries the stabilization function, thus reducing the weight burden on the driving unit.

Inventive Principle:

Principle #2Taking out (Extraction)

2Reliability

If the lens module is moved for optical image stabilization, then shake correction is achieved, but precise control of driving force becomes difficult

Engineering Contradiction:

Improveoptical image stabilization performanceVSAvoidprecise control of driving force

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent inverts the stabilization approach by moving the image sensor instead of the lens module. This inversion enables precise control of driving force because the image sensor assembly is lighter and easier to control with precision motors, while still achieving the required shake correction through sensor displacement perpendicular to the optical axis.

Inventive Principle:

Principle #13The other way round (Inversion)

3Manufacturing precision

If the image sensor is moved perpendicular to the optical axis for stabilization, then precise optical image stabilization is achieved, but the structure becomes more complex

Engineering Contradiction:

Improveprecise optical image stabilizationVSAvoidactuator structure complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent merges the optical image stabilization actuator with the camera module housing, integrating the moving frame, coils, magnets, and support structures into a unified assembly. This merging reduces overall structural complexity by eliminating separate components and interfaces, while still enabling precise image sensor movement perpendicular to the optical axis for stabilization.

Inventive Principle:

Principle #5Merging (Combining)

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 allows for more precise optical image stabilization by moving the image sensor rather than the lens module, reducing the required driving force and improving stabilization performance.

Implementation Method 1

a first driving unit including a plurality of magnets disposed in the fixed frame and a plurality of coils disposed in the moving frame and moved together with the moving frame

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

a plurality of yokes disposed in the moving frame and generating attractive force with respect to the plurality of magnets

Methodology Applied

Scientific EffectMagnetic attraction: Magnetism

Data Source

PatentUS20230188851A1Actuator for optical image stabilization and camera module including the same

Publication Date: 2023.06.15 SAMSUNG ELECTRO MECHANICS CO LTD

AI summary

An optical image stabilization actuator includes a fixed frame having an internal space, a moving frame accommodated in the fixed frame and being movable relative to the fixed frame, a first ball member disposed between the fixed frame and the moving frame, a first driving unit including a plurality of magnets disposed in the fixed frame and a plurality of coils disposed in the moving frame and moved together with the moving frame, a sensor substrate partially coupled to the moving frame to move together with the moving frame, a plurality of yokes disposed in the moving frame and generating attractive force with respect to the plurality of magnets, and an image sensor disposed in a portion of the sensor substrate.