Lens Bobbin Feedback Layout for Faster Auto-Focus Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional micro digital cameras require a long auto-focusing time to perform an auto-focusing function, which is inefficient and delays the focus alignment process.
Innovation Solution
A lens moving apparatus that includes a housing supporting driving magnets, a bobbin with a coil on its outer surface, and a sensing unit to sense the movement of the bobbin. This apparatus uses electromagnetic interaction between the driving magnets and the coil to move the bobbin parallel to the optical axis, allowing for rapid and accurate focusing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a conventional lens moving apparatus is used, then the structure is simple, but the auto-focusing time is long
Solution Approach 1:
The coil is disposed on the outer surface of the bobbin, and the driving magnets are positioned within the housing to surround the coil. This nested arrangement allows the electromagnetic components to be compactly integrated, reducing the overall apparatus size while enabling rapid auto-focusing through efficient electromagnetic interaction between the nested components.
Solution Approach 2:
A sensing unit is incorporated to detect the position of the bobbin during lens movement. This feedback mechanism provides real-time position information, allowing the system to precisely control the lens movement and rapidly achieve accurate focus alignment, thereby significantly reducing auto-focusing time.
2Volume of moving object
If the coil is disposed inside the driving magnets, then the space efficiency is improved, but the durability is reduced due to contact wear
Solution Approach 1:
The patent replaces the conventional mechanical contact-driven lens moving system with an electromagnetic driving system. The coil generates electromagnetic force through electromagnetic interaction with the driving magnets, eliminating mechanical contact and friction between components. This substitution maintains compact spacing while significantly improving durability by removing wear-prone mechanical contact points.
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 apparatus significantly shortens the auto-focusing time, improves the accuracy and speed of focusing, and enhances the space efficiency and durability of the camera module.
Implementation Method 1
moving in a first direction parallel with an optical axis within the housing by electromagnetic interaction between the driving magnets and the coil
Data Source
AI summary
The present embodiment relates to a lens driving device, and more particularly, to a lens driving device capable of reducing a focus alignment time of a lens by feeding back an amount of displacement in an optical axis direction of a lens while improving spatial efficiency of a bobbin.Specifically, the present embodiment includes a housing having a hollow column shape for supporting a driving magnet; At least one lens is installed inside, the outer peripheral surface is provided with a coil disposed inside the driving magnet, parallel to the optical axis inside the housing by electromagnetic interaction between the driving magnet and the coil a bobbin moving in a first direction; It relates to a lens driving device comprising a; displacement sensing unit for determining a first displacement value of the bobbin in the first direction.