Camera Module Frame Reinforcement for Thin OIS Lens Driving
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Solution Overview
Problem
The challenge is to maintain a thin shape of camera modules in electronic devices while ensuring they have an image stabilization function, sufficient driving force for lens movement, and rigidity, especially as these devices become thinner.
Innovation Solution
A lens driving apparatus with a frame structure that includes a reinforcing member coupled to the side portion of the frame, forming a step portion in cross-section, which enhances rigidity and maintains a thin profile by using a resin body and non-magnetic metallic reinforcing member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the camera module is made thinner to reduce device thickness, then the overall size is reduced, but the rigidity and driving force for lens movement become insufficient
Solution Approach 1:
The frame is constructed using composite materials: a resin body combined with a non-magnetic metallic reinforcing member. This composite structure provides both the thin profile needed for compact cameras and the enhanced rigidity required for stable lens driving, resolving the contradiction between reduced thickness and maintained strength.
Solution Approach 2:
The reinforcing member features a step portion formed in cross-section perpendicular to the extending direction of the side portion. This three-dimensional structural feature adds rigidity in critical directions without increasing the overall thickness of the frame, allowing the camera module to remain thin while maintaining structural strength.
2Ease of manufacture
If the frame structure is simplified to reduce manufacturing complexity, then production becomes easier, but the rigidity and image stabilization performance deteriorate
Solution Approach 1:
The frame is segmented into distinct functional components: a resin body providing the basic structure and a separate metallic reinforcing member providing enhanced rigidity. This segmentation allows each component to be manufactured independently using optimal processes (injection molding for the body, metal forming for the reinforcing member) and then assembled, maintaining manufacturing ease while achieving the required structural strength.
Solution Approach 2:
By combining resin and metal materials in a composite frame structure, the invention achieves high rigidity without significantly complicating the manufacturing process. The reinforcing member is coupled to the resin body through standard assembly techniques, preserving ease of manufacture while dramatically improving frame strength and image stabilization capability.
3Strength
If a metallic reinforcing member is added to enhance rigidity, then frame strength is improved, but magnetic interference with the image stabilizer unit may occur
Solution Approach 1:
The metallic reinforcing member is specifically designed with non-magnetic properties and is positioned in locations where it provides structural reinforcement without interfering with the magnetic fields required for image stabilization. This localized application of metal material with specific properties solves the rigidity need while avoiding magnetic interference issues.
Solution Approach 2:
The use of non-magnetic metallic material in the composite frame structure allows the incorporation of metal for enhanced rigidity and thermal conductivity without introducing magnetic interference. This selective material choice in the composite construction resolves the contradiction between needing metallic reinforcement and avoiding magnetic effects on the image stabilizer.
Data Source
AI summary
A lens driving apparatus includes a lens barrel, a carrier configured to accommodate the lens barrel, a focusing unit configured to move the carrier in an optical axis direction, and an image stabilizer unit configured to move the lens barrel in the carrier in a direction perpendicular to the optical axis direction, wherein the image stabilizer unit includes a lens holder to which the lens barrel is fixed, and a frame includes a body supporting the lens holder to guide movement of the lens barrel and having a side portion forming an outer rim, and a reinforcing member coupled to the side portion of the body, wherein the side portion extends along the outer rim of the frame, while the reinforcing member has a step portion formed in a cross-section perpendicular to the extending direction of the side portion.