Multi-layered Rolling Member for Lens Impact Resistance
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Solution Overview
Problem
The increasing size and weight of lenses in smartphone camera modules due to higher resolution image sensors and larger pixel sizes lead to a need for improved impact resistance and deformation prevention while maintaining high strength and rigidity.
Innovation Solution
A lens driving apparatus and camera module utilizing multi-layered rolling members with a core part made of a material with a lower modulus of elasticity, such as plastic, and an outer part made of a higher modulus material like ceramic, to reduce impact and prevent deformation, with the core part occupying 70-90% of the rolling member's radius.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the lens size and weight are increased to achieve higher resolution image sensors and larger pixel sizes, then the image quality is improved, but the impact resistance and deformation prevention deteriorate
Solution Approach 1:
The patent applies composite materials by combining a plastic core part with a ceramic outer part in the rolling members. The plastic core provides impact absorption through its lower modulus of elasticity, while the ceramic outer part provides rigidity and deformation prevention through its higher modulus of elasticity. This composite structure resolves the contradiction by enabling the lens to maintain high image quality while improving impact resistance.
2Measurement precision
If the lens size and weight are increased to achieve higher resolution image sensors and larger pixel sizes, then the image quality is improved, but the deformation prevention deteriorates
Solution Approach 1:
The composite structure of plastic core and ceramic outer part addresses deformation prevention by combining materials with complementary mechanical properties. The ceramic outer part's high modulus of elasticity provides rigidity to prevent deformation, while the plastic core maintains structural integrity. This resolves the contradiction between achieving high image quality with larger lenses and preventing deformation.
3Device complexity
If a single material is used for rolling members, then the device complexity is reduced, but the impact resistance and rigidity balance deteriorates
Solution Approach 1:
The patent uses composite materials with a plastic core and ceramic outer part to achieve both impact resistance and rigidity. The plastic core absorbs impact energy, while the ceramic outer part maintains rigidity. This composite approach resolves the contradiction by providing superior mechanical performance compared to single-material solutions, justifying the increased structural complexity.
Solution Approach 2:
The patent applies local quality by assigning different materials to different parts of the rolling member based on functional requirements. The core part uses plastic for impact absorption, while the outer part uses ceramic for rigidity and wear resistance. This localized material assignment resolves the contradiction between structural simplicity and mechanical performance by optimizing each region for its specific function.
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
This configuration enhances impact resistance and maintains high rigidity, reducing the maximum impact amount and preventing image deformation, thereby improving the camera module's durability and image quality.
Implementation Method 1
The material of the core part may have a lower modulus of elasticity than a modulus of elasticity of the material of the outer part
Data Source
AI summary
A lens driving apparatus is provided. The lens driving apparatus includes a first frame which accommodates a lens; a driver, connected to the first frame, and configured to generate a driving force to move the first frame in a first direction; and a group of rolling members that include at least one multi-layered rolling member including two or more different materials, wherein the group of rolling members at least partially contacts the first frame.