Linked Camera Module Aperture Control During Lens Focusing

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Solution Overview

Problem

Existing camera modules face issues with the weight distribution and focusing mechanism due to the placement of the adjustable diaphragm on the object side of the lens, leading to lens tilting and requiring complex electrical wiring, which complicates the design and affects focusing precision.

Innovation Solution

A camera module design that integrates an autofocus mechanism, adjustable diaphragm mechanism, and linkage mechanism, where the focus driving assembly moves the lens and the linkage mechanism adjusts the shading blade to adaptively change the aperture, ensuring synchronized focus and aperture adjustments.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the adjustable diaphragm is arranged on the object side of the lens, then the camera module can adapt to different light and dark scenes, but the weight of the object side of the lens increases, causing the lens to tilt and affecting focus driving

Engineering Contradiction:

Improveadaptability to different light and dark scenesVSAvoidweight of object side of lens

Core Design Contradiction:

Adaptability or versatilityVSWeight of moving object

Solution Approach 1:

The patent inverts the conventional arrangement by placing the adjustable diaphragm on the image side of the lens instead of the object side. This inversion resolves the weight distribution problem while maintaining the diaphragm's light control functionality. The supporting frame structure provides balanced support, preventing lens tilting and ensuring stable focus driving.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent introduces a new spatial dimension by positioning the diaphragm in a different location (image side vs object side) and using a supporting frame structure that provides multi-dimensional support. This dimensional change allows the diaphragm to be supported without adding concentrated weight to the object side, thus preventing lens tilting.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Strength

If a leaf spring is used to support the lens with adjustable diaphragm, then the lens can be supported, but the hardness of the leaf spring must be increased, which may affect focusing precision

Engineering Contradiction:

Improvesupporting strengthVSAvoidfocusing precision

Core Design Contradiction:

StrengthVSManufacturing precision

Solution Approach 1:

The patent replaces the traditional leaf spring mechanical support system with an electrically controllable supporting frame system. The supporting frame can be adjusted via driving assemblies, providing the necessary support strength without requiring a hard leaf spring that would interfere with focusing precision. This substitution allows independent control of support and focusing functions.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Ease of operation

If internal electrical wiring is set to drive the adjustable diaphragm, then the diaphragm can be controlled, but the electrical wiring may affect focusing, making the design more difficult

Engineering Contradiction:

Improvecontrollability of diaphragmVSAvoiddesign complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent segments the control systems by providing independent driving assemblies for the diaphragm and the focusing mechanism. The first driving assembly controls the diaphragm while the second driving assembly controls focusing, with their paths and control circuits separated. This segmentation eliminates interference between electrical wiring and focusing operations, simplifying the overall design.

Inventive Principle:

Principle #1Segmentation

4Manufacturing precision

If the lens is driven by the focusing mechanism to move, then focusing is achieved, but the distance between the lens and the adjustable diaphragm changes, resulting in a change in the field of view

Engineering Contradiction:

Improvefocusing capabilityVSAvoidfield of view consistency

Core Design Contradiction:

Manufacturing precisionVSAdaptability or versatility

Solution Approach 1:

The patent implements a feedback control mechanism where the position of the lens is detected during focusing, and based on this position information, the controlling assembly adjusts the diaphragm aperture accordingly. This feedback loop ensures that the field of view remains consistent with the aperture size throughout the focusing range, maintaining adaptability while achieving precise focusing.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS20250347980A1Camera module, electronic device and position detection method for camera module

Publication Date: 2025.11.13 AAC OPTICS SOLUTIONS PTE LTD

AI summary

A camera module, an electronic device and a position detection method for the camera module are provided according to the present disclosure. The camera module includes an autofocus mechanism, an adjustable diaphragm mechanism and a linkage mechanism. A focus driving assembly drives a supporting frame to drive a lens to move, so that the autofocus mechanism realizes focusing movement. When the lens moves, the linkage mechanism drives a blade driving assembly to drive a shading blade to move according to a current position of the lens in an optical axis, so as to adaptively change a shading area of the shading blade on the lens. In this way, the focusing movement of the lens can be linked with the aperture adjustment movement of the adjustable diaphragm, thereby realizing the consistent adjustment of the lens focus and the aperture of the diaphragm.