Compact Imaging Module Actuator Using Planar Magnets
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Solution Overview
Problem
Designers of portable electronic devices face challenges in creating compact camera modules that fit within limited spaces while maintaining imaging functionality, as existing solutions struggle to provide smaller form factors without increasing the module's footprint beyond that of the image sensor.
Innovation Solution
A compact imaging module that utilizes an actuator with a combination of magnets and a coil to adjust the distance between the imaging lens and image sensor using electromagnetic forces, allowing for auto-focus and other imaging functions while keeping the module's footprint equal to or smaller than the image sensor's, employing a batch manufacturing process for efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the imaging module uses conventional actuators to adjust lens position, then auto-focus function is achieved, but the module footprint increases beyond the image sensor area
Solution Approach 1:
The patent transitions from conventional linear actuator arrangements to a magnetic field-based actuation system that operates in a different dimensional space. By using planar magnets and coils arranged in a two-dimensional plane beneath the image sensor, the system achieves lens positioning without requiring additional footprint area, effectively moving the actuation mechanism to a different spatial dimension.
Solution Approach 2:
The magnetic actuator components (magnets and coils) are nested within or beneath the image sensor assembly. The planar magnets are positioned on the rear surface of the image sensor, and coils are integrated into the same plane, creating a compact nested structure that eliminates the need for separate actuator housings and reduces overall module footprint.
2Volume of moving object
If the imaging module is made smaller to fit portable devices, then device compactness is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent replaces conventional mechanical actuators (which require physical contact and mechanical linkages) with a magnetic field-based actuation system. This substitution eliminates mechanical wear and reduces the need for precision mechanical tolerances, as the magnetic force can be precisely controlled through electrical current while maintaining compact dimensions.
Solution Approach 2:
The system controls lens position by changing electrical parameters (current magnitude and direction) to the coils, which in turn changes the magnetic field strength and direction. This parameter-based control allows for precise lens positioning without requiring high-precision mechanical components, as the magnetic force can be finely adjusted through electrical control.
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
Enables precise control of the lens assembly for improved image quality and reduced manufacturing costs by maintaining a small surface area, suitable for increasingly slim and lightweight portable devices.
Implementation Method 1
adjust a position of the lens assembly with respect to the image sensor in response to an electromagnetic force generated by one or more magnets and a coil
Data Source
AI summary
The subject matter disclosed herein relates to electromagnetic force generation for an imaging device having a small form factor.