Camera Module Lens Barrel Collision Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The initial movement of the lens barrel in camera modules during auto focusing can cause collisions with other parts, resulting in noise and potential damage due to the lack of precise control when power is first supplied.
Innovation Solution
A camera module with a magnetic member, electromagnetic member, and Hall sensor, controlled by a unit that sets target positions and aligns the lens barrel using a magnetic field to prevent collisions and ensure smooth movement, thereby eliminating noise and damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the lens barrel is moved initially when power is supplied to drive the AF function, then the auto focusing function can be activated, but the lens barrel may collide with other parts causing noise and potential damage
Solution Approach 1:
The Hall sensor detects the position of the magnetic member before the electromagnetic member is activated. The control unit uses this information to determine the initial position and set appropriate target positions, ensuring the lens barrel moves to a safe position before AF driving begins, thus preventing collision while maintaining quick activation
Solution Approach 2:
The Hall sensor continuously monitors the position of the magnetic member coupled to the lens barrel. This feedback mechanism allows the control unit to track the lens barrel's position in real-time and adjust the electromagnetic member's operation to prevent collision, enabling both safe operation and rapid AF response
2Reliability
If the lens barrel position is precisely controlled using Hall sensor and electromagnetic member, then collision is prevented and noise is reduced, but the device complexity increases
Solution Approach 1:
The magnetic member serves as an intermediary element coupled to the lens barrel, which interacts with the Hall sensor and electromagnetic member. This intermediary enables precise position detection and control without requiring direct mechanical connections, simplifying the overall control architecture while maintaining high reliability
Solution Approach 2:
The patent replaces mechanical position detection mechanisms with a magnetic field-based detection system using the Hall sensor. This substitution eliminates complex mechanical linkages and direct contact sensors, reducing mechanical complexity while improving reliability by preventing collision through non-contact sensing
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 prevents collisions and noise by precisely controlling the lens barrel's movement, ensuring accurate positioning and reducing the risk of damage to components during the activation of the auto focusing function.
Implementation Method 1
a Hall sensor installed in the housing and configured to detect a change in magnetic field according to a position of the magnetic member
Implementation Method 2
an electromagnetic member coupled with the housing and configured to generate a magnetic field with the magnetic member so that the lens barrel moves along an optical axis
Data Source
AI summary
A camera module including a housing; a lens barrel having a lens and reciprocating in the housing; a magnetic member coupled with the lens barrel; an electromagnetic member coupled with the housing and generating a magnetic field so that the lens barrel moves along an optical axis; and a Hall sensor in the housing and detecting a change in magnetic field according to a position of the magnetic member before electric power is outputted to the electromagnetic member. A control unit sets a current position of the magnetic member as a first target position, setting an initial position for driving auto focusing as a second target position, aligning the lens barrel to the first target position by controlling electric power supplied to the electromagnetic member, and then moving the lens barrel to the second target position by supplying electric power to the electromagnetic member.