Dynamic Flex Circuit for Camera Sensor Movement
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Solution Overview
Problem
The challenge lies in developing a flexible circuit for cameras with moveable image sensors that can efficiently provide autofocus (AF) and optical image stabilization (OIS) functionality while withstanding high strain and cyclic loading conditions, particularly in small form factor devices like smartphones and tablets.
Innovation Solution
A dynamic flex circuit with fixed and moveable end portions, and intermediate portions that include straight and bend regions, designed to convey electrical signals and withstand stress, featuring reinforcement arrangements at bend regions to reduce strain, and configured to allow movement of the image sensor relative to optical elements for AF and OIS functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flex circuit is used to connect the moveable image sensor to the stationary structure, then the image sensor can move for AF and OIS operations, but the flex circuit is subjected to high strain and cyclic loading that reduces its reliability
Solution Approach 1:
The patent employs a flex circuit constructed from flexible printed circuit board (FPCB) technology, which uses thin flexible substrates to enable the circuit to bend and deform elastically during image sensor movement. This allows the circuit to accommodate the full range of motion for both autofocus and optical image stabilization while maintaining electrical connectivity and structural integrity through repeated cyclic loading
Solution Approach 2:
The patent implements a reinforcement arrangement that locally modifies the flex circuit's structural parameters by adding reinforcement layers or modifying the laminate structure at critical bend regions. This creates zones of increased stiffness and strength precisely where the circuit experiences maximum strain during image sensor movement, allowing the flex circuit to withstand high cyclic loading without fatigue failure
2Adaptability or versatility
If the flex circuit is made more flexible to allow greater image sensor movement, then AF and OIS functionality is improved, but the circuit becomes more susceptible to strain and damage
Solution Approach 1:
The patent applies reinforcement arrangements selectively at specific locations along the flex circuit, particularly at bend regions and areas experiencing maximum strain during image sensor movement. This localized reinforcement creates a non-uniform structural property distribution where the flex circuit maintains high flexibility in non-critical areas while possessing enhanced strength and fatigue resistance at critical stress concentration points
3Strength
If a rigid circuit board is used to ensure structural strength, then the circuit can withstand strain, but the image sensor cannot move for AF and OIS operations
Solution Approach 1:
The patent transitions from a static rigid circuit board to a dynamic flex circuit that can change its configuration during operation. The flex circuit is designed to remain relatively flat and stable during normal operation but can dynamically bend and deform to accommodate image sensor movement for autofocus and optical image stabilization, then return to its original position, enabling repeated cyclic motion without permanent deformation
Data Source
AI summary
Various embodiments include a dynamic flex circuit that may be used in a camera with a moveable image sensor. The dynamic flex circuit may include one or more fixed end portions, a moveable end portion, and an intermediate portion. In some embodiments, the fixed end portion may be connected to another flex circuit of the camera. The moveable end portion may be coupled with the moveable image sensor. The intermediate portion may be configured to allow the moveable end portion to move with the moveable image sensor. Some embodiments include a reinforcement arrangement that reinforces one or more portions of the dynamic flex circuit.