Folded Camera Module Magnetic Stopper for Quiet Lens Travel
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Solution Overview
Problem
Current camera modules face challenges in ensuring reliable operation of auto focus, image stabilization, and zoom functions due to noise and impact issues between lens components, particularly in low-cost electronic devices, where robust mechanical and magnetic solutions are needed to maintain performance.
Innovation Solution
The camera module incorporates a housing with a folded module, a lens module, and magnet stoppers, including stationary and moving magnet stopper members, to generate repulsive forces and limit the movement of lens barrels along the optical axis, ensuring smooth operation of auto focus and image stabilization functions while reducing noise and impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnet stoppers are added to limit lens barrel movement, then reliability of auto focus and image stabilization is improved, but device complexity increases
Solution Approach 1:
The patent replaces traditional mechanical stoppers with magnetic stoppers that use magnetic repulsive forces to limit lens barrel movement. This substitution eliminates direct mechanical contact, reducing noise and impact while maintaining the reliability of auto focus and image stabilization functions.
Solution Approach 2:
The patent introduces magnetic fields as an intermediary between the lens barrel and housing to limit movement. The magnetic stoppers create a repulsive force field that acts as a non-contact barrier, preventing direct mechanical impact while still providing reliable movement limitation for focus and stabilization operations.
2Object-affected harmful factors
If mechanical contact between lens components is reduced, then noise is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent replaces mechanical contact-based movement limitation with a magnetic field-based system. The magnetic stoppers create a contactless repulsive force that prevents lens barrel from hitting mechanical stops, thereby eliminating impact noise while the magnetic field naturally provides smooth, precise control without requiring high-precision mechanical tolerances.
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 enhances the reliability of auto focus and image stabilization functions by minimizing noise and impact between lens components, maintaining performance across various electronic devices, including low-cost models, and effectively limits the movement of lens barrels for precise control.
Implementation Method 1
a magnet stopper including a stationary magnet stopper member disposed in the housing, and a moving magnet stopper member disposed in the lens module to face the stationary magnet stopper member in the optical axis direction and configured to generate a repulsive force to each other
Data Source
AI summary
A camera module including: a housing defining an inner space; a movable holder disposed in the inner space and supported on an inner wall of the housing; a folded module including a reflective member mounted on the movable holder, the reflective member changing a path by reflecting light incident from the outside; a lens module including a plurality of lenses arranged in an optical axis direction to pass the light reflected from the reflective member; a lens barrel disposed at a rear side of the folded module in the inner space to move in the optical axis direction; and a magnet stopper including a stationary magnet stopper member disposed in the housing, and a moving magnet stopper member disposed in the lens module to face the stationary magnet stopper member in the optical axis direction to generate a repulsive force to each other.