LCP Flexible Substrate Resonance Control in Camera Image Stabilization
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Solution Overview
Problem
The high elasticity of polyimide flexible substrates in camera equipment leads to system resonance in image stabilization mechanisms, compromising the precision and effectiveness of lens drive systems in portable electronic devices.
Innovation Solution
The use of liquid crystal polymer (LCP) substrates reduces the elasticity of flexible substrates, allowing for frequency characteristics similar to rigid bodies, thereby minimizing system resonance and enabling more precise servo control of the image stabilization mechanism, which includes a movable frame, coils, magnets, and position detection components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polyimide flexible substrate is used in image stabilization mechanism, then flexibility and ease of manufacture are improved, but system resonance occurs during movement process
Solution Approach 1:
The patent changes the material parameter of the flexible substrate from polyimide to liquid crystal polymer, which fundamentally alters the elasticity and resonance characteristics. This material substitution resolves the contradiction by eliminating system resonance while maintaining manufacturing feasibility through established LCP fabrication processes.
Solution Approach 2:
The patent employs liquid crystal polymer, a specialized composite material with unique properties combining flexibility with resonance suppression. This material choice allows the substrate to maintain its flexible nature for ease of manufacture while preventing the harmful resonance that occurs with conventional polyimide materials.
2Adaptability or versatility
If polyimide flexible substrate is used, then flexibility is improved, but elasticity is too high causing resonance
Solution Approach 1:
The patent fundamentally changes the elastic parameters of the flexible substrate by switching from polyimide to liquid crystal polymer. This parameter change reduces the elasticity to appropriate levels, preventing resonance while preserving the necessary flexibility for the image stabilization mechanism to function properly.
3Device complexity
If conventional flexible substrate is used, then manufacturing simplicity is maintained, but resonance frequency characteristics are poor
Solution Approach 1:
The patent changes the material parameters of the flexible substrate to achieve superior frequency characteristics. The liquid crystal polymer provides better resonance suppression and more predictable vibrational behavior, enabling precise frequency control for the image stabilization mechanism without complicating the overall device structure.
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 solution enhances the stabilization effect by reducing hand-shake correction and image stabilization errors, maintaining signal and power line integrity, and achieving higher-quality image stabilization and focus control.
Implementation Method 1
The use of LCP substrate for the first flexible substrate can greatly reduce the elasticity of existing flexible substrates due to polyimide, so it has frequency characteristics similar to other rigid bodies and system resonance is not easily generated during movement of the image stabilization mechanism
Implementation Method 2
a first coil fixed to the movable frame, the first flexible substrate supplying power to the first coil; and a first magnet configured to drive the first coil to drive the movable frame to move in the plane of the image sensor chip
Implementation Method 3
at least two first position detection components are carried on the first coil, and the at least two first position detection components are configured to cooperate with the first magnet to achieve position detection
Data Source
AI summary
Provided is a camera device, including: a camera lens having an optical axis; a lens driving mechanism configured to drive the camera lens to move along the optical axis; an image stabilization mechanism including a movable frame, and an image sensor chip and a first flexible substrate arranged at the movable frame. The image stabilization mechanism is movable in a plane of the image sensor chip, and the first flexible substrate is made of liquid crystal polymer. The use of the LCP substrate for the first flexible substrate can greatly reduce elasticity of existing flexible substrates due to polyimide, so it has frequency characteristics similar to other rigid bodies and system resonance is not easily generated during movement of the image stabilization mechanism. Therefore, more precise servo control of the movable frame can achieved, thereby enabling camera device to have higher-quality hand-shake correction control and image stabilization control.