Flexible Substrate Camera Module for Multi-Axis Optical Image Stabilization
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Solution Overview
Problem
Camera modules in mobile communication terminals face limitations in optical image stabilization, particularly when shaking occurs in directions other than perpendicular to the optical axis, and struggle to precisely correct continuous shaking during video recording, requiring manual adjustment to track moving objects.
Innovation Solution
A camera module design featuring a housing with an optical assembly that tilts with respect to the housing, including a lens system and image sensor, connected by flexible substrates that extend along the edges of a sensor substrate and overlap each other, allowing for rotation about two perpendicular axes, reducing interference and enhancing optical image stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single rigid substrate is used to connect the sensor substrate to the main substrate, then the structure is simple and stable, but the optical assembly cannot rotate by large angles in multiple directions, limiting optical image stabilization capability
Solution Approach 1:
The single rigid substrate is divided into multiple flexible substrates (first flexible substrate and second flexible substrate) that can independently deform. This segmentation allows each substrate to handle different rotation axes, enabling the optical assembly to rotate by large angles in multiple directions while maintaining connection stability.
Solution Approach 2:
The rigid substrate is replaced with flexible substrates that can dynamically deform during rotation. The flexible substrates change their shape and orientation according to the rotation requirements, allowing the optical assembly to adapt to different imaging directions and achieve comprehensive optical image stabilization.
2Length of moving object
If electrical wires are routed along the rotation axis, then the connection is straightforward, but the wires interfere with the rotation movement and limit the rotation angle
Solution Approach 1:
The electrical connection is transitioned from a linear wire routing along the rotation axis to a planar flexible substrate structure. The flexible substrates extend in directions perpendicular to the rotation axis, allowing electrical connection without physical interference with the rotation movement, thereby enabling larger rotation angles.
Solution Approach 2:
Rigid electrical wires are replaced with flexible substrate films that can bend and deform during rotation. These flexible substrates maintain electrical connection while accommodating the rotational movement, eliminating the interference problem caused by rigid wires and enabling unrestricted rotation.
3Adaptability or versatility
If the lens module is moved only in a direction perpendicular to the optical axis, then the actuator structure is simple, but optical image stabilization is limited when shaking occurs in other directions
Solution Approach 1:
The optical assembly is designed with dynamic rotation capability around multiple perpendicular axes rather than simple linear movement. This allows the system to correct shaking in any direction by rotating the lens module and sensor substrate appropriately, significantly improving adaptability while using the same actuator components.
Solution Approach 2:
The actuator system gains multi-functionality by enabling rotation around multiple axes. The same actuator can now perform optical image stabilization for shaking in any direction, not just perpendicular to the optical axis, making the system universally applicable to various shaking scenarios.
Data Source
AI summary
A camera module includes: a housing; an optical assembly configured to tilt with respect to the housing, and including a lens system and a sensor substrate having an image sensor; a main substrate disposed in the housing and spaced apart from the sensor substrate; and a first flexible substrate and a second flexible substrate configured to connect the sensor substrate to the main substrate. The first flexible substrate and the second flexible substrate are disposed to at least partially overlap each other.