Optical Element Driving Mechanism With Differential Magnetic Guidance

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Solution Overview

Problem

Existing camera module driving mechanisms fail to meet the needs of miniaturization and stability in electronic devices, particularly in achieving autofocus and optical image stabilization while maintaining accuracy and preventing rotation during movement.

Innovation Solution

The optical element driving mechanism includes a fixed assembly, movable part, and guiding assembly with specific guiding elements and magnetic interactions to stabilize and guide the movable part, utilizing differential magnetic attraction forces to prevent rotation and enhance accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If the camera module is miniaturized, then the device size is reduced, but the stability and accuracy of the driving mechanism deteriorates

Engineering Contradiction:

Improvecamera module sizeVSAvoiddriving mechanism stability

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

The driving mechanism is divided into separate functional modules: a driving assembly with magnetic elements for actuation, and a guiding assembly with guiding elements for constraint. This segmentation allows each module to be optimized independently for miniaturization while maintaining overall stability and accuracy through coordinated design.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The guiding elements act as intermediaries between the movable part and the fixed assembly, providing precise constraints on movement. These guiding elements mediate the interaction between the magnetic driving forces and the mechanical structure, ensuring stable and accurate motion despite miniaturization.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If the movable part is driven to move, then autofocus and optical image stabilization functions are achieved, but rotation during movement occurs reducing precision

Engineering Contradiction:

Improveautofocus and OIS functionVSAvoidmovement accuracy

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The guiding elements are positioned asymmetrically relative to the movable part, creating a constrained path that prevents rotation during movement. This asymmetric arrangement of guiding elements (first guiding element and second guiding element at different positions) ensures that the movable part can only move along the intended trajectory, maintaining precision while achieving autofocus and OIS functions.

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The patent replaces traditional mechanical linkages and constraints with a magnetic driving system combined with geometric guiding elements. The magnetic elements provide the driving force while the guiding elements provide the constraints, substituting complex mechanical transmission systems with a simpler magnetic-mechanical hybrid system that achieves the same functions with better precision.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS20250284088A1Optical element driving mechanism

Publication Date: 2025.09.11 ACTUTEK CORP

AI summary

An optical element driving mechanism is provided and includes a fixed assembly, a movable part and a driving assembly. The movable part is configured to connect an optical element, and the movable part is movable relative to the fixed assembly. The driving assembly is configured to drive the movable part to move relative to the fixed assembly. The fixed assembly includes an accommodating space configured to accommodate the optical element.