Camera Module with Electromagnetic Lens Zoom Alignment
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Solution Overview
Problem
Existing camera modules face issues such as friction torque generation, lens decentering and tilt, limited light intake, magnetic field interference, and increased power consumption during zooming and image stabilization, particularly in ultra-small and ultra-thin designs, which affect image quality and safety in applications like advanced driver assistance systems.
Innovation Solution
The camera module incorporates a base with separate guide parts for each lens assembly, featuring precise numerical control and reduced friction torque, along with a spacer and position detection sensor arrangement that minimizes magnetic interference and optimizes lens alignment, using a tunable prism for image stabilization with low power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a zoom actuator is used for zooming function, then zooming capability is achieved, but friction torque is generated causing decrease in driving force and increase in power consumption
Solution Approach 1:
The patent replaces the mechanical zoom actuator with an electromagnetic lens assembly that uses electromagnetic fields to move lens groups. This substitution eliminates mechanical contact and friction torque, thereby reducing power consumption while maintaining zooming capability through electromagnetic actuation.
Solution Approach 2:
The patent changes the operating parameters by using electromagnetic fields instead of mechanical forces. The lens groups are moved through electromagnetic attraction and repulsion, transforming the physical mechanism from mechanical to electromagnetic, which eliminates friction and reduces power consumption.
2Adaptability or versatility
If lens groups are moved for zooming, then zooming function is achieved, but lens decentering and tilt occur affecting image quality
Solution Approach 1:
By replacing mechanical actuators with electromagnetic fields, the system eliminates mechanical misalignment and friction that cause lens decentering and tilt. The electromagnetic lens assembly provides precise control without physical contact, maintaining optimal lens alignment during zooming operations.
Solution Approach 2:
The electromagnetic lens assembly serves multiple functions simultaneously: it performs zooming, maintains lens alignment, and prevents decentering and tilt. This multi-functional approach ensures that image quality is preserved while achieving the zooming function.
3Object-generated harmful factors
If spacing between lens groups is increased to reduce friction, then friction torque is reduced, but lens decentering and tilt are deepened
Solution Approach 1:
The patent eliminates the need for mechanical spacing and friction by using electromagnetic fields to move lens groups. This substitution removes the trade-off between spacing and alignment, as electromagnetic actuation provides precise control without mechanical contact regardless of group spacing.
4Measurement precision
If pixel size is reduced to increase resolution, then resolution increases, but light intake decreases causing image shake in dark environments
Solution Approach 1:
The patent introduces optical image stabilization to counteract the reduced light intake effect. By compensating for camera shake through optical correction, the system enables high-resolution imaging in dark environments despite smaller pixel sizes, effectively balancing resolution and light intake requirements.
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 design reduces friction torque, improves image quality and resolution, prevents lens decentering and tilt, enhances magnetic field interference prevention, and ensures efficient light intake, while maintaining mechanical reliability and low power consumption, particularly suitable for advanced driver assistance systems.
Implementation Method 1
an OIS function by changing an optical path
Implementation Method 2
a position detection sensor disposed on the first spacer
Data Source
AI summary
A camera module includes a base having a first stopper and a second stopper, a first lens assembly disposed in the base and having a first magnet, a second lens assembly disposed in the base and having a second magnet, and a third lens assembly fixed to the base and having a third stopper. The first lens assembly is disposed between the second lens assembly and the third lens assembly. The first lens assembly includes a first portion configured to contact the first stopper of the base and a third portion protruding from the first lens assembly, the third portion being configured to contact the third stopper of the third lens assembly. The second lens assembly includes a second portion protruding from the second lens assembly, the second portion being configured to contact the second stopper of the base.