Moving-Coil Variable Aperture With Low-Resistance Electrical Connection

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Solution Overview

Problem

Conventional variable apertures in camera modules have complex electrical connection structures and high power consumption due to large resistance during rotation, making assembly difficult and increasing energy usage.

Innovation Solution

A variable aperture design using a moving coil driving mechanism with a magnetic piece on the fastening base and a coil on the rotating bracket, simplified electrical connections through spring plates and flexible circuit boards, and optimized spring plate stiffness to reduce resistance and power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the drive chip and coil are disposed on the rotating bracket, then the variable aperture can change aperture size, but the electrical connection structure becomes complex and assembling difficulty increases

Engineering Contradiction:

Improveaperture size adjustment capabilityVSAvoidelectrical connection structure complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent divides the variable aperture into two separate components: a fixed base and a rotating bracket. The drive chip remains on the fixed base while only the coil and magnetic piece are on the rotating bracket. This segmentation simplifies the electrical connection structure by reducing the number of components that need to be electrically connected during rotation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The drive chip is extracted from the rotating bracket and placed on the fixed base. This extraction eliminates the need for complex electrical connections on the rotating bracket, as the drive chip only needs to connect to stationary components, significantly simplifying the electrical connection structure.

Inventive Principle:

Principle #2Taking out (Extraction)

2Adaptability or versatility

If the rotating bracket rotates relative to the fastening base, then aperture adjustment is achieved, but large resistance on the rotating bracket causes high power consumption

Engineering Contradiction:

Improveaperture adjustment capabilityVSAvoidpower consumption

Core Design Contradiction:

Adaptability or versatilityVSUse of energy by moving object

Solution Approach 1:

The patent replaces the conventional mechanical rotation system with an electromagnetic driving system. The coil generates a magnetic field that interacts with the magnetic piece to produce rotational motion, eliminating the need for mechanical friction and reducing resistance losses during rotation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent optimizes the magnetic piece configuration and coil parameters to enhance the electromagnetic interaction efficiency. By adjusting the magnetic field strength and distribution, the system achieves effective aperture adjustment with lower power consumption, reducing the energy required for rotation.

Inventive Principle:

Principle #35Parameter changes

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 design simplifies the electrical connection structure, reduces assembly complexity, and lowers power consumption, resulting in a more reliable and energy-efficient variable aperture and camera module.

Implementation Method 1

the coil is disposed on the rotating bracket, the magnetic piece is disposed on the fastening base, the coil is disposed facing the magnetic piece, and the coil is configured to drive the rotating bracket to rotate relative to the fastening base

Methodology Applied

Scientific EffectElectromagnetic interaction: Lorentz Force

Data Source

PatentUS20250362565A1Variable aperture, camera module, and electronic device

Publication Date: 2025.11.27 HUAWEI TECH CO LTD

AI summary

A variable aperture is provided. The variable aperture includes a fastening base, a rotating bracket, a coil, a magnetic piece, a drive chip, a first electrical connector, a second electrical connector, and a plurality of blades. The rotating bracket is rotatably connected to the fastening base. The coil is disposed on the rotating bracket, and the magnetic piece is disposed on the fastening base. The coil is configured to drive the rotating bracket to rotate relative to the fastening base, to change a hole diameter of the aperture hole. Both the drive chip and the first electrical connector are disposed on the fastening base, the second electrical connector is disposed on the rotating bracket, and the coil is electrically connected to a power supply interface of the drive chip through the second electrical connector and the first electrical connector.