Camera Module Bobbin Orientation Compensation for AF and OIS Stability
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Solution Overview
Problem
Existing camera modules face challenges in maintaining AF and OIS performance due to gravity-induced drooping and magnetic field interference, leading to performance deterioration and malfunctions.
Innovation Solution
A camera device with a bobbin, elastic members, and a controller that adjusts the movement distance of the bobbin based on orientation changes, using a motion sensor to correct for gravitational influences and magnetic field interferences, ensuring accurate AF and OIS operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If voice coil motor technology is applied to miniaturized camera modules, then camera resolution and additional functions (autofocusing, handshake correction, zooming) can be achieved, but gravitational influence causes drooping or movement of OIS operation unit leading to AF operation performance deterioration
Solution Approach 1:
The controller performs preliminary compensation by determining a correction value based on the current orientation of the housing before executing AF operation. This preliminary action prevents gravitational drooping from affecting AF performance, allowing the system to maintain reliability while achieving miniaturization and high resolution.
Solution Approach 2:
The system uses the motion sensor to continuously monitor the orientation of the housing and provides feedback to the controller. The controller adjusts the movement distance of the bobbin based on this feedback, creating a closed-loop system that maintains AF operation performance despite gravitational influences in miniaturized camera modules.
2Adaptability or versatility
If housing orientation changes due to gravitational influence, then camera module adaptability to different orientations is improved, but bobbin displacement occurs causing AF operation malfunction
Solution Approach 1:
The controller changes the movement distance parameter of the bobbin based on the detected housing orientation. By adjusting this parameter according to the current orientation, the system maintains AF operation stability across different orientations while preserving adaptability to various camera positions.
3Ease of operation
If OIS operation unit is made movable for handshake correction, then camera stabilization function is improved, but magnetic field interference causes operation malfunction
Solution Approach 1:
The controller acts as an intermediary that coordinates between the OIS operation unit and AF operation unit. By determining the movement distance of the bobbin in consideration of OIS operation unit displacement, the controller prevents magnetic field interference from causing malfunction, ensuring reliable operation of both stabilization and focusing functions.
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
Prevents performance deterioration and malfunctions by compensating for gravitational effects and magnetic interferences, thereby improving AF and OIS operations in camera modules.
Implementation Method 1
a first elastic member coupled both to the housing and to the bobbin, a second elastic member disposed between the first elastic member and the circuit board
Implementation Method 2
A camera device according to an embodiment includes a circuit board, a housing disposed on the circuit board, a bobbin disposed on the circuit board, a first elastic member coupled both to the housing and to the bobbin, a second elastic member disposed between the first elastic member and the circuit board, and a controller configured to determine a movement distance of the bobbin in an optical-axis direction in consideration of displacement of the bobbin caused by a change in the orientation of the housing
Data Source
AI summary
A lens moving apparatus may include a circuit board, a housing disposed above the circuit board, the housing including first and second side portions opposite to each other and third and fourth side portion opposite to each other, a bobbin disposed in the housing, a magnet including a first magnet unit disposed at the first side portion of the housing, a second magnet unit disposed at the second side portion of the housing, and a third magnet unit disposed at the third side portion of the housing, a balancing member disposed at the fourth side portion of the housing, a first coil disposed on the bobbin and configured to move the bobbin in an optical axis direction by an interaction with the magnet, a sensing magnet disposed on the bobbin, and a first position sensor. The first position sensor may overlap the sensing magnet in the optical axis direction.