Hall Sensor Optical Image Stabilizer X-Y Displacement
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Solution Overview
Problem
Conventional optical image stabilizers face challenges in miniaturization and slimness due to the limitations of Hall sensors and magnets in detecting displacement in both X and Y directions, leading to obstructive size and temperature sensitivity issues.
Innovation Solution
The optical image stabilizer features a Hall sensor with one face opposed to a magnet, allowing it to detect variations in magnetic force across both directions, enabling simultaneous detection of lens group displacement in X and Y directions without increasing the camera module's size, and can be designed to be smaller than the coil thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a Hall sensor is used to detect displacement in X and Y directions, then displacement measurement capability is improved, but the size of the camera module increases due to the need for multiple sensors or complex sensor arrangements
Solution Approach 1:
The patent applies a single Hall sensor to perform multiple functions by detecting magnetic field variations from different magnet arrangements. The Hall sensor measures displacement in both X and Y directions simultaneously by detecting changes in magnetic force intensity caused by relative movement between the lens group and magnets, eliminating the need for separate sensors for each direction.
Solution Approach 2:
The patent combines the displacement detection function for both X and Y directions into a single Hall sensor system. By strategically positioning multiple magnets around the optical axis and using one Hall sensor to detect composite magnetic field variations, the system merges what would traditionally require multiple sensors into a single compact detection unit.
2Measurement precision
If magnets are arranged with predetermined gaps from the Hall sensor to enable displacement detection, then measurement capability is improved, but the overall size and thickness of the optical image stabilizer increases
Solution Approach 1:
The patent transitions from a linear arrangement where sensors are positioned at a distance from magnets to a radial arrangement where magnets are positioned around the optical axis at different angular positions. This dimensional change allows the Hall sensor to detect displacement in multiple directions without increasing the overall thickness of the stabilizer, as the magnetic field interactions occur in the radial plane rather than along the optical axis.
Solution Approach 2:
The patent creates different local magnetic field environments by positioning magnets at specific angular positions around the optical axis. Each magnet creates a localized magnetic field zone that interacts with the Hall sensor in a specific way, allowing the system to detect displacement in different directions through localized field variations rather than requiring uniform spacing that would increase overall dimensions.
3Measurement precision
If multiple Hall sensors are used to detect displacement in both directions, then measurement precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent makes a single Hall sensor universal by enabling it to detect displacement in both X and Y directions through strategic magnet positioning. The Hall sensor processes composite magnetic field signals that contain information about movement in both directions, eliminating the need for multiple specialized sensors and reducing system complexity.
Solution Approach 2:
The patent introduces magnets as intermediary elements that mediate between the lens group displacement and the Hall sensor detection. The magnets convert mechanical displacement in multiple directions into magnetic field variations that a single Hall sensor can detect, serving as an intermediary that enables one sensor to perform the work of multiple sensors.
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 configuration allows for a compact and slim optical image stabilizer design, improving miniaturization and reducing temperature sensitivity, enabling precise displacement measurement while maintaining a slim profile.
Implementation Method 1
the Hall sensor causes a variation in a signal in response to a variation in magnetic force
Data Source
AI summary
An optical image stabilizer is provided, in which magnets and coils are arranged such that they oppose each other. The Hall sensors are arranged such that one face of each is opposed to one face of the magnets, respectively. The Hall sensors can detect the location of a group of lenses by generating a corresponding signal in response to a variation in magnetic force following a variation in the gap between magnets depending on the direction in which a group of lenses is driven, and simultaneously, in response to a variation in magnetic force that occurs when the group of lenses is displaced in the direction that intersects the direction of the gap.