Camera Aperture Blade Hole Geometry for Drop Impact Reliability
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Solution Overview
Problem
Existing aperture modules in camera modules suffer from blade deformation due to impacts during falls, which affects the reliability and functionality of the camera module.
Innovation Solution
The aperture module design includes a base with a guide slot and a pivot pin, a blade unit with driving holes, and an aperture driver with a driving pin, where the driving holes have a central portion with a greater width than the end portions, and the driving pin is inclined to reduce impact deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the blade is combined with a driving pin formed in an aperture module to control aperture size, then the aperture can be adjusted to control light amount, but the blade may be deformed by impact forces during falls
Solution Approach 1:
The driving hole's width parameter is changed along its length, creating a variable cross-section that is wider at the central portion and narrower at end portions. This parameter change allows the driving pin to move freely during normal operation while preventing blade deformation during impacts by absorbing impact energy through the narrower end portions
Solution Approach 2:
The driving hole design incorporates narrower end portions that act as cushioning elements before impacts occur. These narrower sections are positioned to contact the driving pin during impacts, absorbing impact forces beforehand and preventing them from reaching the blade, thus protecting the blade from deformation
2Loss of substance
If the driving hole has a narrow width to reduce material usage, then manufacturing cost decreases, but the blade becomes more susceptible to deformation under impact
Solution Approach 1:
The driving hole's width parameter varies along its length rather than being uniform. The central portion has a greater width to provide strength during normal operation, while the end portions have narrower widths to reduce material usage and act as impact absorption zones
Solution Approach 2:
Different portions of the driving hole have different widths tailored to their specific functions: the central portion has greater width for structural integrity and driving pin engagement during normal operation, while the end portions have narrower width to reduce material usage and serve as impact cushioning elements
Data Source
AI summary
An aperture module includes a base including a guide slot and a protruding pivot pin; a blade unit including a plurality of blades which pivot to form a first diameter aperture and a second diameter aperture; and an aperture driver including a driving pin that moves along the guide slot. The driving hole includes a first end portion and a second end portion that contact the driving pin when the first and second diameter apertures are formed, and a central portion that connects the first end portion and the second end portion. A width of a central portion of the driving hole in a first direction that is vertical to a center line connecting two points between the first end portion and the second end portion by a maximum distance is greater than maximum widths of the first end portion and the second end portion.