Camera Module Sensor Shift for Thin-Device Image Stabilization
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Solution Overview
Problem
As electronic devices become thinner, the effect of user hand shake on camera modules increases, necessitating improved image stabilization to reduce the influence of hand shake.
Innovation Solution
A camera module design featuring a lens barrel, a case, a sensor driver with a fixed and movable portion connected by driving wires, and elastic members, allowing the image sensor to move horizontally and rotate relative to the optical axis for enhanced stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the camera module size is decreased to accommodate thinner electronic devices, then the device thickness is reduced, but the susceptibility to user hand shake increases
Solution Approach 1:
The sensor driver is designed with a movable portion that can dynamically adjust the position of the image sensor in response to detected hand shake movements. The driving wires enable the movable portion to shift the image sensor horizontally and rotate it, creating a dynamic compensation mechanism that actively counteracts instability caused by the reduced module size.
Solution Approach 2:
The system changes the positional parameters of the image sensor by controlling the deformation of driving wires through applied currents. By varying the electrical parameters (current supply to driving wires), the system achieves precise control over the image sensor's position and orientation, enabling compensation for hand shake effects despite the compact module dimensions.
2Volume of moving object
If the image sensor is positioned off-center in the off state, then space is optimized for compact design, but alignment with the optical axis must be corrected during operation
Solution Approach 1:
The sensor driver transitions from a static to a dynamic configuration, where the movable portion can shift the image sensor from its off-center position in the off state to the correct optical axis alignment in the on state. This dynamic repositioning capability allows the system to optimize space utilization while maintaining precise optical alignment during operation.
Solution Approach 2:
The driving wires act as intermediaries that transmit the corrective force needed to realign the image sensor with the optical axis. By controlling the deformation of these intermediary elements, the system achieves precise positional adjustment without requiring the image sensor to be permanently positioned at the center, thus optimizing both space and alignment.
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 design effectively corrects errors caused by shaking through both horizontal and rotational movements, improving image stabilization while reducing electromagnetic interference and simplifying the module's components.
Implementation Method 1
In an on state the plurality of driving wires are supplied with a current, and the movable portion may move in a horizontal movement direction on a plane perpendicular to the optical axis by deformation of a plurality of driving wires
Implementation Method 2
The camera module may further include one or more elastic members connected between the fixed portion and the movable portion
Data Source
AI summary
A camera module includes a lens barrel including a plurality of lenses, a case that accommodates the lens barrel, a sensor driver disposed in the case, and an image sensor mounted to the sensor driver, wherein, in an off state, a center of the image sensor is disposed in one direction with respect to an optical axis of the plurality of lenses.