MEMS Autofocus Camera Module with Fixed Lens Groups
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Solution Overview
Problem
Conventional autofocus zoom cameras are complex, large, heavy, costly, and unreliable, particularly in miniature forms used in portable electronics, due to the combination of multiple optical functions which complicates the optical train.
Innovation Solution
A miniature camera module with a MEMS actuated autofocus and zoom capability, featuring a pre-aligned optical train with a first and second fixed lens group and a movable lens between them, coupled to a MEMS actuator for auto focus and zoom operations, along with a processor for image processing and correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple optical functions (autofocus and zoom) are combined in conventional cameras, then imaging capability is improved, but device complexity increases
Solution Approach 1:
The optical train is divided into separate functional modules: a fixed lens group and a movable lens group. The movable lens group contains both the autofocus lens and zoom lens, allowing independent control of focus and zoom functions. This segmentation simplifies the overall optical design while maintaining multiple imaging capabilities.
Solution Approach 2:
The patent implements dynamic lens positioning where the movable lens group can be independently actuated along the optical axis. This dynamic mechanism allows the system to switch between autofocus and zoom operations by controlling the position of the movable lens group relative to the fixed lens group, enabling versatile imaging without complex optical paths.
2Adaptability or versatility
If conventional autofocus zoom mechanisms are used, then imaging functionality is improved, but device size and weight increase
Solution Approach 1:
The patent replaces traditional mechanical autofocus and zoom mechanisms with a MEMS (Micro-Electro-Mechanical Systems) actuator. This MEMS device uses electrostatic forces to move the movable lens group, eliminating the need for heavy mechanical gears, motors, and linkages. The result is a significant reduction in device weight and size while maintaining full autofocus and zoom functionality.
3Adaptability or versatility
If conventional autofocus zoom mechanisms are used, then imaging functionality is improved, but manufacturing cost increases
Solution Approach 1:
The patent combines both autofocus and zoom functions into a single movable lens group actuated by one MEMS device. This merging of functions reduces the number of separate components, assembly steps, and alignment procedures required during manufacturing. The simplified structure lowers production costs compared to conventional designs that use separate mechanisms for focus and zoom.
Solution Approach 2:
The MEMS actuator replaces complex mechanical systems with a micro-fabricated device that can be manufactured using standard semiconductor processing techniques. This substitution significantly reduces manufacturing complexity and cost, as MEMS devices can be produced in high volumes with precise control, eliminating the need for expensive precision mechanical assemblies.
4Adaptability or versatility
If conventional autofocus zoom mechanisms are used, then imaging functionality is improved, but system reliability decreases
Solution Approach 1:
The patent replaces mechanical components (gears, motors, linkages) with a MEMS actuator that has no moving parts in the traditional sense. The MEMS device uses electrostatic fields to position the lens group, eliminating mechanical wear, friction, and potential failure points. This results in higher reliability and longer operational life while maintaining full autofocus and zoom capabilities.
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
This design achieves compact, reliable, and efficient autofocus and zoom functions in miniature cameras, reducing size, weight, and cost while maintaining high image fidelity across varying distances and lighting conditions.
Implementation Method 1
A MEMS actuator is coupled to the movable lens group for moving the movable lens group in an autofocus operation
Implementation Method 2
The function of the optical train is to capture light from the scene of interest and focus it on to the image sensor with high fidelity
Data Source
AI summary
A MEMS auto focus miniature camera module includes an image sensor and an optical train including at least one movable lens and one or more fixed lenses or fixed lens groups on either side of the movable lens. The movable lens provides an auto focus feature of the camera module. A MEMS actuator translates the movable lens through an auto focus range to adjust focus.