Camera Module Lens Assembly with Spacer Stray Light Control
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Solution Overview
Problem
Camera modules struggle to simultaneously achieve ultra-wide angle, low stray light, and assembly stability, as increasing the number of lenses for wider angles leads to stray light issues and assembly instability.
Innovation Solution
A camera module design featuring a 7-piece lens assembly with spacers between lenses to stabilize assembly and reduce stray light, where each spacer is partially in contact with a lens surface and shields light from entering the edge structure, controlling parameters like effective focal length, diameter, and air intervals to ensure stability and minimize stray light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the number of lenses is increased to achieve ultra-wide angle, then the field-of-view is expanded, but stray light at the edge positions increases and assembly stability deteriorates
Solution Approach 1:
The patent introduces spacers as intermediary components between adjacent lenses. These spacers serve dual functions: they provide mechanical support and positioning to maintain assembly stability, and they act as light shields to block stray light from entering edge structures of lenses. This intermediary solution effectively addresses both the stray light problem and assembly stability issue while maintaining the ultra-wide angle configuration with multiple lenses.
2Area of moving object
If the number of lenses is increased to achieve ultra-wide angle, then the field-of-view is expanded, but assembly stability deteriorates
Solution Approach 1:
The patent segments the lens assembly by introducing spacers between adjacent lenses. This segmentation divides the continuous lens train into discrete, independently supported sections. Each spacer acts as a separate structural element that provides localized support and positioning, thereby maintaining overall assembly stability even as the number of lenses increases to achieve ultra-wide angle coverage.
3Reliability
If spacers are added between lenses to reduce stray light and improve stability, then assembly stability and stray light control improve, but device complexity increases
Solution Approach 1:
The spacers in the patent are designed to perform multiple functions simultaneously: they provide mechanical support for lens positioning, act as light shields to block stray light, and maintain the required air gaps between lenses. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity while achieving improved assembly stability and stray light 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
The design achieves a wide field-of-view while maintaining miniaturization and thinness, improving assembly stability and reducing stray light, thus enhancing the camera module's performance and reliability.
Implementation Method 1
a seventh lens having negative refractive power, which are sequentially arranged in the lens barrel along an optical axis of the lens barrel from an object side to an image side
Implementation Method 2
each spacer in the first spacer to the sixth spacer is capable of shielding light from entering an edge structure portion of a lens arranged on an image side of the spacer
Data Source
AI summary
A camera module. The camera module includes a lens barrel, and a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens having a negative refractive power provided in the lens barrel, and a spacer arranged between the sixth lens and the seventh lens on the optical axis of the camera module. An effective focal length f7 of the seventh lens, an inner diameter d6m of an image-side surface of the sixth spacer, an air interval T67 between the sixth lens and the seventh lens along the optical axis, and a maximum thickness CP6 of the sixth spacer satisfy: 1.0<|d6m/f7|+T67/CP6<8.5.