Camera Actuator with Vertical Tilting Guide for OIS
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Solution Overview
Problem
Ultra-slim and ultra-small camera modules face challenges in securing sufficient space for optical image stabilizers (OIS) due to high pixel density, which limits lens size and increases image shake in dark environments, and magnetic field interference occurs between OIS, AF, and zooming functions.
Innovation Solution
A camera actuator design with a housing, mover, tilting guide, and strategically positioned magnets and driving parts that allow for precise X-axis and Y-axis tilting without increasing device size, minimizing magnetic interference, and optimizing lens size for better light reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pixel density of the image sensor is increased to improve resolution, then the image quality is improved, but the pixel size becomes smaller and the amount of light received decreases, causing more severe image shake
Solution Approach 1:
The patent segments the camera module into multiple functional layers with the actuator system positioned beneath the lens assembly. This segmentation allows the optical member to be tilted for OIS compensation without requiring lateral space expansion, thereby maintaining high pixel density while enabling effective image stabilization through vertical layer utilization.
Solution Approach 2:
The patent transitions from lateral space utilization to vertical space utilization by implementing the actuator system in a layered configuration beneath the lens. The optical member tilts along the optical axis direction, converting the OIS mechanism from a horizontal plane operation to a vertical plane operation, thus accommodating high-resolution sensors without increasing device thickness.
2Reliability
If an OIS actuator is added to correct image shake, then the image stabilization function is improved, but the device size and thickness increase
Solution Approach 1:
The patent implements a nested structure where the actuator system is positioned beneath the lens assembly, with the optical member nested within the lens housing. The tilting mechanism is integrated into the existing lens structure, allowing the OIS function to be embedded within the camera module without adding external protrusions or increasing overall device thickness.
Solution Approach 2:
The patent utilizes the vertical dimension beneath the lens assembly to house the actuator system, rather than expanding the device laterally. The optical member tilts along the optical axis direction, converting the OIS mechanism from a horizontal plane operation to a vertical plane operation, thus accommodating high-resolution sensors without increasing device thickness.
3Volume of moving object
If multiple actuators for OIS, AF, and zooming are disposed close to each other to save space, then the device compactness is improved, but magnetic field interference occurs between the actuators
Solution Approach 1:
The patent extracts the OIS actuator system as a separate functional unit positioned beneath the lens assembly, distinct from the AF and zooming actuators. The OIS magnet is specifically positioned away from other magnetic components, creating magnetic field isolation zones that prevent interference while maintaining compact overall module dimensions through vertical layering.
Solution Approach 2:
The patent introduces magnetic shielding structures and strategic positioning of magnetic components as intermediary elements between the OIS, AF, and zooming actuators. These intermediaries act as magnetic field barriers, allowing close proximity of multiple actuators for compactness while preventing harmful magnetic field interference through controlled magnetic isolation.
4Use of energy by moving object
If the lens size is increased to improve light reception in dark environments, then the light reception amount is improved, but the available space for OIS actuator is reduced
Solution Approach 1:
The patent transitions from lateral space utilization to vertical space utilization by implementing the actuator system in a layered configuration beneath the lens. The optical member tilts for OIS compensation along the optical axis direction, allowing the lens to be optimized for light reception without compromising actuator space, as the tilting mechanism operates in the vertical dimension rather than requiring lateral clearance.
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
Enables effective OIS function in ultra-slim cameras with stable structure and low power consumption, preventing magnetic field interference and enhancing image quality by securing sufficient light without increasing device thickness.
Implementation Method 1
a first magnet disposed in the housing, a second magnet disposed in the holder and spaced apart from the first magnet in a first direction, and a first driving part and a second driving part configured to drive the mover
Data Source
AI summary
One embodiment of the present invention discloses a camera actuator comprising: a housing; a mover disposed in the housing and comprising an optical member and a holder having the optical member disposed therein; a tilting guide unit for guiding the tilting of the mover; a first magnet disposed in the housing; a second magnet disposed in the holder and spaced from the first magnet in a first direction; and a first driving part and a second driving part for driving the mover, wherein the first driving part and the second magnet are disposed, with respect to the holder, in a second direction perpendicular to the first direction, and the second driving part is disposed, with respect to the holder, in a third direction perpendicular to the second direction.