Electromagnetic Driving Module for Compact Camera Lens Stabilization
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Solution Overview
Problem
Conventional driving modules for camera devices are complex, large, and power-intensive due to their complex construction and reliance on multiple transmission elements, leading to high manufacturing costs and increased thickness, as well as continuous power consumption even when not in use.
Innovation Solution
An electromagnetic driving module with a stationary and movable portion, rolling balls, a driving magnet, and a magnetic attraction element, which allows for compact assembly and reduced power consumption by using magnetic forces to support a lens assembly, eliminating the need for hanging wires and enabling easy assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional driving modules use complex driving members and transmission elements, then driving reliability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent replaces the conventional mechanical driving system (stepper motor, ultrasonic motor, piezoelectric actuator, and transmission elements) with an electromagnetic driving system. The driving coil generates a magnetic field that interacts with the driving magnet to produce driving force, eliminating the need for complex mechanical transmission elements while maintaining driving reliability
Solution Approach 2:
The patent extracts and removes the complex transmission elements (gears, belts, linkages) from the driving module, keeping only the essential electromagnetic components (driving coil, driving magnet, movable portion). This simplification reduces device complexity and manufacturing cost while the electromagnetic system maintains sufficient driving reliability
2Stability of the object's composition
If conventional OIS modules use hanging wires to suspend lens barrel, then position stability is improved, but device thickness increases
Solution Approach 1:
The patent replaces the mechanical hanging wire suspension system with an electromagnetic support system. The driving magnet and magnetic attraction element create magnetic force to support the movable portion and lens assembly, eliminating the need for long hanging wires and thereby reducing device thickness while maintaining position stability through magnetic field control
3Stability of the object's composition
If OIS driving module operates continuously to maintain lens barrel position, then position stability is improved, but power consumption increases
Solution Approach 1:
The patent employs periodic or intermittent operation of the driving coil instead of continuous operation. The control unit activates the driving coil only when position adjustment is needed, allowing the magnetic attraction element to maintain lens barrel position through residual magnetic force or passive magnetic support, thereby reducing power consumption while maintaining position stability
Solution Approach 2:
The magnetic attraction element creates an upward magnetic force that counteracts the weight of the movable portion and lens assembly, providing passive support that maintains position stability without requiring continuous active driving, thus reducing power consumption
4Use of energy by moving object
If electromagnetic driving module uses magnetic force to support movable portion, then power consumption is reduced, but magnetic force control precision must be improved
Solution Approach 1:
The patent incorporates a control unit that monitors the position of the movable portion and adjusts the driving coil current accordingly. This feedback mechanism ensures precise magnetic force control, maintaining position accuracy while enabling intermittent operation to reduce power consumption
Solution Approach 2:
The patent controls the magnetic force by adjusting electrical parameters (current, voltage, frequency) of the driving coil. By precisely controlling these electrical parameters, the system achieves accurate magnetic force regulation, enabling stable position control with reduced power consumption through optimized current levels
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 electromagnetic driving module is easier to assemble, has reduced thickness, and lowers power consumption by using magnetic forces to maintain the lens assembly's position, improving image quality and reducing manufacturing costs.
Implementation Method 1
The driving coil is arranged to correspond to the driving magnet and configured to enable the movement of the movable portion along a direction perpendicular to the main axis
Implementation Method 2
The magnetic force between the magnetic attraction element and the driving magnet is greater than the sum of the weight of the movable portion, the element, and the magnetic member
Implementation Method 3
The plurality of rolling balls includes a first rolling ball, a second rolling ball, a third rolling ball, and a fourth rolling ball. The first, second, and third rolling balls are in direct contact with the movable portion and the stationary portion
Data Source
AI summary
An electromagnetic driving device is provided, which includes a stationary portion, a movable portion adapted to support an element, a number of rolling balls, a driving magnet, a driving coil, and a magnetic attraction element. The stationary portion and the movable portion are arranged along a main axis. The rolling balls and the driving magnet are positioned between the stationary portion and the movable portion. The driving coil is arranged to correspond to the driving magnet and configured to enable the movement of the movable portion along a direction perpendicular to the main axis. The magnetic attraction element is arranged to correspond to the driving magnet. The magnetic force between the magnetic attraction element and the driving magnet is greater than the sum of the weight of the movable portion, the element, and the magnetic member.