Liquid Crystal Polyester Resin Composition for Camera Modules
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Solution Overview
Problem
Conventional liquid crystal polymer compositions used in camera modules suffer from powder exfoliation during assembly and use, leading to image defects and reduced product performance, while lacking a balance between rigidity, heat resistance, and mechanical strength.
Innovation Solution
A liquid crystal polyester resin composition combining specific amounts of talc, glass fiber, and titanium oxide, optimized for surface transferability and minimal exfoliation, with a tailored particle size and viscosity range to enhance mechanical strength and heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional liquid crystal polymer compositions are used for lens barrel and mount holder portions, then heat resistance and rigidity are achieved, but powder exfoliation occurs during assembly and use leading to image defects
Solution Approach 1:
The patent uses a composite material system consisting of liquid crystal polyester resin combined with specific inorganic fillers (talc, silica, titanium oxide) and lubricants. This composite structure maintains the heat resistance and rigidity of the base polymer while the inorganic fillers reduce powder exfoliation by providing structural stability and reducing resin degradation during assembly operations.
Solution Approach 2:
The patent optimizes specific parameters including the particle size distribution of fillers (0.1-10 μm for titanium oxide, 1-50 μm for talc), the viscosity of the resin composition (10-100 Pa·s at 350°C), and the precise ratios of components. These parameter optimizations ensure the material maintains dimensional stability and minimal exfoliation while withstanding solder reflow temperatures.
2Temperature
If liquid crystal polymer is used for thin-walled camera module parts, then heat resistance is improved, but mechanical strength and surface transferability deteriorate
Solution Approach 1:
The patent incorporates a balanced composite formulation with liquid crystal polyester resin, talc (10-50 parts by mass), silica (5-30 parts by mass), and titanium oxide (1-20 parts by mass). This composite structure provides enhanced mechanical strength through filler reinforcement while maintaining thin-walled geometry, and the specific filler combinations preserve surface transferability by controlling surface morphology and reducing defects.
Solution Approach 2:
The patent applies different filler types and sizes to different functional requirements: larger talc particles (1-50 μm) provide structural reinforcement for mechanical strength, while finer silica and titanium oxide particles (0.1-10 μm) enhance surface quality and transferability. This local quality differentiation within the composite ensures both structural integrity and surface performance in thin-walled parts.
3Object-generated harmful factors
If liquid crystal polymer composition is optimized for surface transferability, then powder exfoliation is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent defines specific parameter ranges to control powder exfoliation: viscosity of 10-100 Pa·s at 350°C, deflection temperature under load of 220°C or higher, and precise filler content ranges. These quantified parameters provide clear manufacturing targets that balance surface transferability performance with manufacturing feasibility, avoiding excessive complexity while achieving minimal exfoliation.
Solution Approach 2:
The patent emphasizes homogeneous dispersion of multiple fillers within the liquid crystal polyester matrix through controlled processing. This homogeneity ensures consistent performance across the material, reducing variability and simplifying manufacturing by eliminating the need for complex multi-step processing while maintaining low exfoliation levels.
Data Source
AI summary
A resin composition for surface-mountable (SMT) camera modules which is excellent in the balance between heat resistance, rigidity, strength or moldability and surface exfoliation characteristics is provided by using a liquid-crystal polyester resin composition which comprises 100 parts by mass of a liquid-crystal polyester, 15 to 60 parts by mass of talc having a number-mean particle diameter of 10 to 50 μm, 25 to 50 parts by mass of glass fiber having a number-mean fiber length of 100 to 200 μm, 6 to 20 parts by mass of titanium oxide, and 2 to 10 parts by mass of carbon black and which exhibits a melt viscosity of 10 to 100 Pa S as determined at a shear rate of 100 sec−1 and 370° C. and a deflection temperature under load of 220° C. or above.