Lens Driving Device Pin and Ball Guide for Friction Torque Reduction
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Solution Overview
Problem
Camera modules face issues with friction torque generation, lens decentering, and lens tilting during zooming, which affect image quality and resolution, especially in compact devices with size limitations.
Innovation Solution
A lens driving device with a pin-guided housing that uses balls for minimal friction and a magnetic attraction system to maintain precise lens alignment, reducing friction torque and preventing lens decentering and tilting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the gap in the moving area is increased to reduce friction torque resistance, then friction torque is reduced, but lens decent or lens tilt occurs during zoom movement
Solution Approach 1:
A guide pin is introduced as an intermediary component between the lens assembly and the housing. The guide pin fits into a guide groove on the lens assembly and moves along with it, providing guidance and constraint while allowing smooth movement. This intermediary structure reduces friction torque resistance without causing lens decent or tilt, as the guide pin maintains proper alignment throughout the zoom range.
2Adaptability or versatility
If a mechanical movement system is used to move the lens for zooming, then zooming function is achieved, but friction torque is generated affecting driving force and power consumption
Solution Approach 1:
The patent replaces traditional high-friction mechanical movement systems with a low-friction mechanical system featuring a guide pin and guide groove configuration. This substitution maintains the zooming function while significantly reducing friction torque, thereby improving driving force and reducing power consumption requirements.
3Volume of moving object
If the camera module is made compact with size limitation, then portability is improved, but space for zooming is limited making it difficult to implement zooming function
Solution Approach 1:
The guide groove is designed with a specific three-dimensional configuration that allows the lens assembly to move efficiently within a compact space. By optimizing the spatial arrangement and utilizing vertical space, the design enables full zooming functionality within a reduced overall camera module volume, making it suitable for portable devices.
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 minimizes friction torque, improves driving power and control characteristics, and enhances image quality by maintaining precise lens alignment, enabling smooth zooming in compact camera modules.
Implementation Method 1
a ball bearing provided inside the lens assembly, and a pin provided in the camera module and penetrating the ball bearing
Implementation Method 2
a magnet disposed below the housing, a yoke disposed to be spaced apart from the magnet, and a coil disposed between the magnet and the yoke
Data Source
AI summary
One embodiment relates to a lens driving device and a camera module including same. The lens driving device according to the one embodiment can include: a base; a pin coupled to the base; and a housing including a lens group and moving in the optical axis direction along the pin. The housing can include, in one side thereof, a ball accommodation part and a plurality of balls arranged in the ball accommodation part. The pin is arranged in the ball accommodation part so as to be capable of guiding the housing while being in contact with the plurality of balls.