Imaging Module Lens Segmentation for Actuator Stability
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Solution Overview
Problem
Existing camera modules face challenges in accurately positioning lenses and imaging sensors due to production variations in relative positional shifts and optical axis tilts, which lead to issues like shading and partial blur, despite the use of active alignment methods and positioning mechanisms.
Innovation Solution
The camera module incorporates a focus adjustment mechanism with a movable and non-movable portion, where a first lens group is fixed to the movable portion and a second lens group is fixed to the non-movable portion, allowing for precise alignment and reducing the stroke amount needed during focusing, thereby minimizing positional shifts and improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the actuator is fixed to the substrate using adhesive, then the actuator can be secured in position, but the base may move during adhesive curing causing relative positional shift and tilt
Solution Approach 1:
The lens system is divided into two groups: a first lens group fixed to the movable portion and a second lens group fixed to the non-movable portion. This segmentation allows the first lens group to be positioned using active alignment while the second lens group provides a stable reference, compensating for the instability introduced by adhesive fixation of the actuator.
Solution Approach 2:
The non-movable portion acts as an intermediary between the movable portion and the substrate. It provides a stable mounting base for the second lens group and serves as a reference frame that isolates the sensitive optical components from the positional variations caused by actuator fixation instability.
2Manufacturing precision
If active alignment is performed to correct production variations, then positioning accuracy can be improved, but the process complexity increases
Solution Approach 1:
By dividing the lens system into two groups with different fixation methods, the patent simplifies the overall positioning strategy. The first lens group undergoes active alignment while the second lens group is fixed relative to the stable non-movable portion, eliminating the need for complex alignment mechanisms for the entire lens system.
Solution Approach 2:
Different parts of the lens system are treated differently: the first lens group receives active alignment treatment where positioning precision is critical, while the second lens group is fixed to the non-movable portion where stability is prioritized. This local differentiation optimizes the overall system without requiring complex mechanisms throughout.
3Adaptability or versatility
If the holder is fixed to the yoke and base with weak force by spring, then the structure remains flexible, but moving tilt occurs causing partial blur
Solution Approach 1:
The lens system is segmented into two groups with different support characteristics. The first lens group on the movable portion benefits from the spring's flexibility for adaptation, while the second lens group on the non-movable portion achieves stable optical axis alignment without relying on weak spring forces that cause tilt.
Solution Approach 2:
The non-movable portion serves as an intermediary that provides a rigid, tilt-free mounting base for the second lens group. This stable intermediate structure isolates the optical components from the moving tilt caused by spring-based flexible fixation, maintaining optical axis alignment while allowing the movable portion to retain its adaptive flexibility.
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 configuration enables accurate positioning of lenses and the imaging sensor, reduces the risk of shading and partial blur, and decreases power consumption and module size by minimizing the stroke amount required for focusing, while maintaining excellent image quality even at macro positions.
Implementation Method 1
When current flows through the coil 105 in the actuator 101 configured as described above, electromagnetic force is generated between the coil 105 and the magnet 106. With the electromagnetic force, the holder 104 is displaced in an optical axis direction of the lenses 102 together with the lenses 102 and the barrel 103.
Implementation Method 2
when the base 108 is fixed to the substrate 109 with an adhesive 114, the actuator 101 is fixed to the substrate 109
Data Source
AI summary
An imaging module (camera module 50) includes a movable portion (holder 4 and coil 5) which fixes a first lens group (1) and is displaced in an optical axis direction thereof, and a non-movable portion (magnet 6, yoke 7, and base 8) which fixes a second lens group (2) and is not displaced in the optical axis direction, and includes a focus adjustment mechanism (actuator 20A) fixed to the substrate.