SMA Pan-Tilt Camera Module for Large-Angle Optical Stabilization
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Solution Overview
Problem
Current electronic devices face challenges in achieving large-angle image stabilization while maintaining image clarity due to handheld shaking during photography, and there is a need to reduce the size of camera modules for integration in devices with limited internal space.
Innovation Solution
A pan-tilt-zoom module with an SMA motor-driven carrier that tilts in any direction to stabilize the lens relative to the image sensor, combined with a compact electrical connection structure and elastic support mechanisms, allowing for large-angle image stabilization without affecting clarity and reducing module size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an OIS component is integrated into the camera module to improve image clarity, then image stabilization capability is improved, but the size of the camera module increases
Solution Approach 1:
The patent combines the OIS function with the existing carrier and image sensor assembly. The carrier that already holds the image sensor is made tiltable, merging the stabilization function with the existing imaging structure rather than adding a separate OIS mechanism, thereby avoiding increased module size.
Solution Approach 2:
The carrier is designed to serve multiple functions: it holds the image sensor, enables auto-focus movement along the optical axis, and provides image stabilization through tilting. This multi-functionality eliminates the need for separate components for each function, maintaining compact size while achieving comprehensive camera capabilities.
2Reliability
If the image stabilization angle is increased to meet large-scale motion requirements, then image stabilization performance is improved, but image clarity may be affected due to lens tilting relative to the image sensor
Solution Approach 1:
The patent merges the lens and image sensor onto the same tiltable carrier. This ensures that when the carrier tilts for image stabilization, both the lens and image sensor tilt together, maintaining their relative alignment and preventing image clarity degradation even at large stabilization angles.
Solution Approach 2:
The carrier tilts in the same direction and by the same angle as the device shake, creating a compensating motion that stabilizes the image. This copying of the shake motion in reverse allows large-angle stabilization without compromising image quality.
3Device complexity
If traditional driving structures are used for carrier tilting, then the structure is simple, but the driving force is insufficient for large-angle stabilization
Solution Approach 1:
The patent replaces traditional mechanical driving structures with an electromagnetic driving structure. This electromagnetic mechanism provides sufficient driving force for large-angle carrier tilting while maintaining reasonable structural complexity, overcoming the limitation of insufficient force in purely mechanical systems.
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 effective large-angle image stabilization with maintained clarity and compact size, integrating optical and auto-focus functions, and reducing the board area occupied by the camera module.
Implementation Method 1
an SMA motor configured to drive the carrier to tilt in the accommodating cavity along with the image sensor in any direction around
Data Source
AI summary
A pan-tilt-zoom device includes a housing, a carrier, an image sensor, and a shape memory alloy (SMA) motor. An accommodating cavity is formed in the housing, and a first opening in communication with the accommodating cavity is provided on the housing. The carrier is located in the accommodating cavity, the carrier has a lens mounting hole, and an opening at one end of the lens mounting hole faces the first opening. The image sensor is located in the accommodating cavity and is disposed on a side that is of the carrier and that is away from the first opening, and a photosensitive surface of the image sensor faces an opening at the other end of the lens mounting hole. The SMA motor is configured to drive the carrier to tilt in the accommodating cavity along with the image sensor in any direction around, to implement optical image stabilization.