Lens Barrel Composition with Lubricants for Rigidity and Friction
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Solution Overview
Problem
Existing lens barrel members face challenges with high coefficient of friction, poor rigidity, and dimensional stability, leading to difficulties in assembly and operation, particularly when using thermoplastic resin compositions with glass fibers, which result in excessive driving force, noise, and dust during device operation.
Innovation Solution
A lens barrel composition comprising 50-75 wt% polycarbonate resin, 20-45 wt% glass fibers subjected to surface treatment, 0.5-3 wt% polyolefin wax, and 0.5-3 wt% fluorinated olefin resin, with a specific weight ratio of polyolefin wax to fluorinated olefin resin, to achieve low friction, improved rigidity, and dimensional stability, allowing smooth coupling via male and female threads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a thermoplastic resin composition using glass fibers is used to improve rigidity, then rigidity is improved, but the coefficient of friction increases and dimensional stability deteriorates
Solution Approach 1:
The patent uses a composite material system consisting of polycarbonate resin as the base matrix, glass fibers as reinforcement, and multiple lubricants (polyolefin wax and fluorinated olefin resin) to create a multi-component composite that simultaneously achieves rigidity, low friction, and dimensional stability. The glass fibers provide structural rigidity while the polycarbonate matrix binds them together, and the lubricants reduce friction and improve out-of-roundness
Solution Approach 2:
The patent optimizes specific parameter ranges: glass fiber content at 20-45 wt%, polyolefin wax at 0.5-3 wt%, fluorinated olefin resin at 0.5-3 wt%, and a weight ratio of polyolefin wax to fluorinated olefin resin between 1:0.3 to 1:3. These parameter optimizations ensure the composite achieves the desired balance of rigidity, low friction coefficient (0.1-0.4), and dimensional stability (out-of-roundness of 90 μm or less)
2Strength
If a material with high coefficient of friction is used for the lens barrel, then assembly difficulty increases and excessive driving force, noise and dust are induced, but structural integrity is maintained
Solution Approach 1:
The patent introduces lubricants (polyolefin wax and fluorinated olefin resin) as intermediary substances that reduce friction between the lens barrel and housing during assembly and operation. These lubricants act as mediators that enable smooth coupling via male and female threads while maintaining the structural integrity of the polycarbonate-glass fiber composite material
Solution Approach 2:
The patent optimizes the lubricant content parameters (polyolefin wax: 0.5-3 wt%, fluorinated olefin resin: 0.5-3 wt%) to achieve the desired friction coefficient of 0.1-0.4. This parameter optimization ensures smooth assembly and operation without compromising the structural strength and rigidity of the lens barrel
Data Source
AI summary
Disclosed herein is a lens barrel member. The lens barrel member includes: a lens barrel surrounding an outer periphery of a lens; and a housing receiving the lens barrel, the lens barrel being secured to the housing, wherein the lens barrel is formed of a lens barrel composition including: about 50 wt % to about 75 wt % of a polycarbonate resin; about 20 wt % to about 45 wt % of a glass fiber; about 0.5 wt % to about 3 wt % of a polyolefin wax; and about 0.5 wt % to about 3 wt % of a fluorinated olefin resin, and a weight ratio of the polyolefin wax to the fluorinated olefin resin ranges from about 1:0.3 to about 1:3. The lens barrel member can have a low coefficient of friction and/or good properties in terms of rigidity and/or dimensional stability.