Lens Driving Device with Embedded Reinforcement for Thin, Lightweight Bases
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Solution Overview
Problem
There is a demand for further miniaturization and weight reduction of lens driving devices to support the miniaturization and weight reduction of camera mounting devices such as smartphones.
Innovation Solution
A lens driving device with a fixing part having a base with thick and thin portions, reinforced by embedded reinforcing plates, and a movable part connected to the fixing part, along with a driving source that moves the movable part, allowing for a camera module with an image-capturing part and a camera mounting device that processes image information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the base is made thinner to achieve miniaturization, then the thickness is reduced, but the strength and rigidity deteriorate
Solution Approach 1:
The patent applies composite materials by embedding a reinforcing plate (metal or other rigid material) within the resin base. This creates a composite structure where the resin provides lightweight properties and the embedded plate provides strength and rigidity, resolving the contradiction between thinning the base and maintaining structural integrity.
Solution Approach 2:
The reinforcing plate is strategically positioned at the bottom surface of the base where structural support is most needed. This local reinforcement approach strengthens the base in critical areas without adding uniform thickness throughout, allowing the base to remain thin overall while maintaining necessary strength.
2Weight of stationary object
If the base is made thinner to achieve weight reduction, then the weight is reduced, but the strength and rigidity deteriorate
Solution Approach 1:
The composite structure of resin base with embedded reinforcing plate achieves weight reduction compared to a solid metal base of the same thickness, while the embedded plate provides the necessary strength. This resolves the contradiction between weight reduction and maintaining strength.
Solution Approach 2:
By concentrating reinforcement material only where structurally necessary (at the bottom surface), the design minimizes overall weight while maintaining strength in critical load-bearing areas, resolving the weight-strength contradiction.
3Length of moving object
If the base thickness is reduced for miniaturization, then the device size is reduced, but the reliability deteriorates
Solution Approach 1:
The embedded reinforcing plate within the thin resin base provides structural stability and prevents deformation, ensuring reliable operation of the lens driving device despite the reduced overall thickness. This composite approach maintains reliability while enabling miniaturization.
Solution Approach 2:
Strategic placement of the reinforcing plate at the bottom surface provides localized structural support that ensures reliability in critical areas without requiring the entire base to be thick, thus maintaining reliability while enabling thin design.
Data Source
AI summary
Provided are a lens driving device, a camera module, and a camera mounting device with which miniaturization and weight reduction can be achieved. the lens driving device is provided with: a fixing part; a movable part configured to be capable of holding a lens part and movably connected to the fixing part in an optical axis direction; a driving source that moves the movable part; and a flexible printed circuit board that supplies power to the driving source, wherein the flexible printed circuit board includes: a first board part that is fixed to the fixing part; and a second board part that is connected to the first board part and is at least partially apart from the fixing part.