Compact Imaging Module Actuator Footprint Reduction
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Solution Overview
Problem
Designers of portable electronic devices face challenges in creating compact camera modules with small form factors that can fit within limited spaces while maintaining imaging functionality, as existing solutions often result in larger profiles due to the placement and size of actuators relative to image sensors.
Innovation Solution
A compact imaging module design that adjusts the distance between the imaging lens and the image sensor using an actuator with a smaller footprint, incorporating a magnet and coil configuration or a spring mechanism to provide precise control and a narrower upper lens portion, allowing the module to maintain a footprint equal to or smaller than the image sensor, enabling auto-focus and other imaging functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a conventional actuator is used to adjust the position of the imaging lens assembly, then the imaging function can be achieved, but the overall footprint of the camera module increases beyond the image sensor area
Solution Approach 1:
The actuator is positioned above the image sensor rather than beside it, utilizing the vertical dimension (z-axis) to accommodate the actuator components. This dimensional reorganization allows the camera module footprint to match the image sensor area while still providing auto-focus capability through vertical lens assembly adjustment.
Solution Approach 2:
The actuator components (magnet, coil, spring) are nested within the vertical space above the image sensor, with the magnet and coil positioned to minimize horizontal footprint while the spring mechanism provides the necessary mechanical movement for the lens assembly in the vertical direction.
2Area of stationary object
If the actuator is positioned above the image sensor, then the footprint is minimized, but the coil and magnet configuration becomes more complex
Solution Approach 1:
The magnet and coil are positioned in close proximity above the image sensor, with the magnet directly above the coil. This merged configuration allows the electromagnetic actuation mechanism to function within a compact vertical space, minimizing the horizontal footprint while maintaining the necessary actuation capability through direct vertical coupling of the electromagnetic components.
3Volume of moving object
If the lens assembly is positioned closer to the image sensor, then the module becomes more compact, but the image quality may be compromised
Solution Approach 1:
The lens assembly is made dynamically adjustable through the spring-based actuator mechanism, allowing it to move vertically between different positions. This dynamic positioning capability enables the system to achieve optimal image quality at different focus distances while maintaining a compact overall module size, as the lens can be precisely positioned anywhere within the vertical travel range of the spring mechanism.
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 allows for a compact camera module with improved image quality and manufacturing efficiency, as the actuator's footprint is minimized, and the module can be fabricated using batch processes, reducing manufacturing costs and enabling slimmer, smaller, and lighter portable devices.
Implementation Method 1
incorporating a magnet and coil configuration or a spring mechanism to provide precise control
Implementation Method 2
incorporating a magnet and coil configuration or a spring mechanism to provide precise control
Data Source
AI summary
The subject matter disclosed herein relates to an imaging device having a small form factor.