Lens Driving Shaft Grip Structure to Reduce Scratches and Dust
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Solution Overview
Problem
Existing lens driving devices in camera devices with a zoom function experience scratches and dust generation due to the friction between the driving shaft and the lens holding portion, leading to potential damage and performance issues.
Innovation Solution
A lens driving device is designed with a spring member having a grip portion that sandwiches and grasps the driving shaft, featuring extension piece portions that protrude while being bent to separate from the driving shaft, reducing friction and contact points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the driving shaft is held by elastic force and frictional force through direct contact with the lens holding portion, then the driving shaft can be securely positioned and driven, but scratches and dust are generated due to friction between the driving shaft and the lens holding portion
Solution Approach 1:
A rubber member is introduced as an intermediary between the driving shaft and the lens holding portion. The rubber member contacts the driving shaft through its inner peripheral surface, providing elastic force and frictional force to hold the driving shaft, while preventing direct contact between the driving shaft and the lens holding portion, thereby suppressing scratches and dust generation.
Solution Approach 2:
The material properties of the gripping element are changed from hard (metal) to soft (rubber). The rubber member's elastic and frictional properties enable it to securely hold the driving shaft through deformation and adhesion, while its softer nature reduces harmful friction effects compared to rigid materials.
2Ease of manufacture
If the driving shaft is directly inserted into the lens holding portion for assembly, then the structure is simple and easy to manufacture, but the driving shaft is damaged due to scratching during insertion
Solution Approach 1:
The rubber member serves as a protective intermediary during assembly. When the driving shaft is inserted, the rubber member's soft inner peripheral surface prevents direct scratching contact between the driving shaft and the hard lens holding portion, protecting the driving shaft while maintaining simple assembly structure.
3Device complexity
If the grip portion directly contacts the driving shaft without extension piece portions, then the structure is simpler, but scratches occur due to direct friction and contact between the grip portion and the driving shaft
Solution Approach 1:
The grip portion is segmented into multiple functional elements: the inner peripheral surface for contact, the extension piece portions for structural support and positioning, and the recessed portions for flexibility. This segmentation allows the grip portion to maintain driving shaft contact while reducing harmful friction through the rubber material's properties.
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 effectively suppresses scratches and dust generation by minimizing contact between the driving shaft and the lens holding portion, enhancing the reliability and longevity of the lens driving device.
Implementation Method 1
a vibration member that is connected to one end of the driving shaft and causes the driving shaft to micro-vibrate
Implementation Method 2
a spring member fixed to the lens holding portion and having a grip portion that sandwiches and grasps the driving shaft
Data Source
AI summary
A lens driving device includes a lens holding portion, a driving shaft, a vibration member, and a spring member. The vibration member is connected to one end of the driving shaft and causes the driving shaft to micro-vibrate. The spring member is fixed to the lens holding portion and includes a grip portion that sandwiches and grasps the driving shaft. Extension piece portions that protrude while being bent so as to be separated from the driving shaft are provided at end sides of the grip portion in an axial direction of the driving shaft.