Flexure Sensor Module Layout for Compact OIS-AF Camera Modules
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Solution Overview
Problem
Existing small form factor cameras face challenges in achieving high-resolution imaging while maintaining compact size, particularly in integrating optical image stabilization (OIS) and autofocus (AF) mechanisms effectively.
Innovation Solution
A flexure module configuration with a moveable image sensor, utilizing a Voice Coil Motor (VCM) arrangement, where the image sensor is mounted on an OIS frame translating in X and Y directions, and flexures connect the dynamic platform to the static platform, supporting electrical signal traces, with components repositioned to reduce thickness and enhance space efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optical image stabilization and autofocus mechanisms are integrated into small form factor cameras, then image quality and functionality are improved, but device size and complexity increase
Solution Approach 1:
The patent implements nesting by placing the image sensor carrier within the flexure assembly structure, where the flexure arms are positioned inside the housing that contains both the lens assembly and sensor. This nested arrangement allows the OIS and AF mechanisms to share spatial envelope, enabling high-resolution imaging with compact form factor.
Solution Approach 2:
The patent transitions from traditional planar component layout to a three-dimensional stacked architecture where the image sensor carrier is positioned at a different Z-height than the lens assembly. The flexure arms extend in multiple dimensions (X, Y, and Z axes) to connect components, utilizing vertical space to reduce overall module footprint while maintaining functionality.
2Stability of the object's composition
If traditional rigid connections are used to connect optical components, then structural stability is maintained, but adjustment flexibility and compactness are reduced
Solution Approach 1:
The patent employs flexible flexure arms instead of rigid connections to connect the image sensor carrier to the housing. These flexure arms provide elastic deformation capability, allowing the sensor to be positioned at optimal focal planes for autofocus while maintaining structural integrity. The flexible connections enable both stability and adjustability simultaneously.
Solution Approach 2:
The patent introduces dynamic elements through the flexure arms that can elastically deform to accommodate focus adjustment and stabilization movements. This dynamic capability allows the system to adapt to different focusing distances and vibration compensation requirements while maintaining overall structural stability through the controlled elasticity of the flexure components.
3Ease of manufacture
If components are arranged in traditional planar layouts, then manufacturing simplicity is maintained, but space utilization and thickness reduction are limited
Solution Approach 1:
The patent moves from two-dimensional planar arrangement to three-dimensional spatial distribution of components. The lens assembly, flexure arms, and image sensor carrier are positioned at different Z-heights, with the sensor carrier located below the lens assembly plane. This vertical stacking approach significantly reduces the overall module thickness while maintaining manufacturing feasibility through standardized assembly processes.
Solution Approach 2:
The patent divides the camera module into distinct functional segments: the lens assembly, the flexure mechanism, and the image sensor carrier. Each segment is independently positioned and assembled, with the flexure arms serving as connecting elements. This segmentation allows for simplified manufacturing of individual components that can then be integrated into the compact three-dimensional 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
The solution enables compact camera modules with improved autofocus and optical image stabilization, reducing thickness and enhancing image quality by optimizing component placement and communication pathways.
Implementation Method 1
utilizing a Voice Coil Motor (VCM) arrangement, where the image sensor is mounted on an OIS frame translating in X and Y directions
Implementation Method 2
flexures connect the dynamic platform to the static platform, supporting electrical signal traces
Data Source
AI summary
A camera includes a lens carrier to which lens(es), defining an optical axis, are mounted. The lens carrier and the lens(es) are movable along the optical axis. The camera includes an autofocus (AF) damping structure for dampening motion of the lens carrier and the lens(es) in a direction along the optical axis. The camera includes a flexure platform having a dynamic platform to which an image sensor and a substrate are connected for movement together with the dynamic platform, a static platform connected to a static portion of the camera, and multiple flexure arms that mechanically connect the dynamic platform to the static platform. The camera includes electronic component(s) and a volume of space vertically aligned with the AF damping structure and extending from the AF damping structure to the substrate. The volume of space does not include a mounting location of the electronic component(s).