Camera Module Lens Alignment and Hall Sensor Placement
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Solution Overview
Problem
Camera modules face challenges such as friction torque generation, lens decentering, tilt, and magnetic field interference during zooming and image stabilization, which affect image quality and resolution, particularly in ultra-thin and ultra-small designs used in vehicles for advanced driver assistance systems.
Innovation Solution
A camera module design featuring a base with precisely controlled guide parts and position detection sensors, where the guide parts are separate from the base and include protrusions and grooves to minimize friction torque and align lens groups accurately, and the use of a Hall sensor with a reduced distance to the magnet to enhance sensitivity and thrust while preventing magnetic field interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a zoom actuator is used for zooming function, then magnification can be adjusted, but friction torque is generated causing decrease in driving force and increase in power consumption
Solution Approach 1:
The patent replaces the traditional mechanical zoom actuator with an electromagnetic driving part consisting of a coil and magnet. This substitution eliminates friction torque by using electromagnetic force instead of mechanical contact, thereby reducing power consumption while maintaining the zooming function.
2Loss of energy
If separation distance is increased to reduce friction torque, then driving force improves, but lens decentering and tilt are deepened during zoom movement
Solution Approach 1:
The patent eliminates the need for mechanical contact between the lens assembly and base by using electromagnetic force for driving. This allows the lens assembly to move freely without friction while maintaining precise alignment through the electromagnetic field, thus reducing both friction torque and lens decentering.
Solution Approach 2:
The patent changes the driving mechanism from mechanical to electromagnetic, which fundamentally alters the interaction parameters between the lens assembly and base. This parameter change allows for reduced separation distance without increasing friction torque, thereby maintaining lens alignment precision while eliminating friction.
3Measurement precision
If Hall sensor distance to magnet is reduced to increase sensitivity, then detection precision improves, but magnetic field interference increases
Solution Approach 1:
The patent extracts the Hall sensor from the base and relocates it to the lens assembly. This separation allows the sensor to be positioned close to the magnet for high sensitivity while the magnetic field interference is contained within the lens assembly, preventing interference with other base components.
Solution Approach 2:
The patent uses the lens assembly as an intermediary structure to house the Hall sensor near the magnet. This intermediary placement enables close proximity for high sensitivity detection while isolating the magnetic field to a specific region, reducing interference with other system components.
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 reduces friction torque, improves driving force and control characteristics, enhances image quality and resolution by preventing lens misalignment, and increases the sensitivity of the Hall sensor while maintaining thrust, effectively addressing the challenges in ultra-thin and ultra-small camera modules.
Implementation Method 1
a hall sensor disposed inside the winding of the coil to detect a change in magnetic flux of a predetermined magnet mounted on the moving lens housing to detect the position of the lens housing
Implementation Method 2
a first driving part which is a magnet driving part disposed on the second camera actuator and including a first magnet and a first coil part corresponding to the first magnet
Data Source
AI summary
A camera module or camera device according to an embodiment includes a base, a first lens assembly disposed in the base, a first coil part disposed on the base, a first spacer disposed on the base, a first spacer disposed on the first spacer, and a first position detection sensor disposed on the first spacer. The first spacer includes a first support portion and a first protrusion protruding from the first support portion, and the first position detection sensor may be disposed on the first protrusion, and the first protrusion may be disposed in the hollow of the first coil part.