Camera Autofocus and Sensor-Shift OIS Magnet Layout
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Solution Overview
Problem
The increasing weight of lenses due to higher pixel density in camera devices makes it difficult to secure sufficient electromagnetic force for optical image stabilization, especially in limited spaces.
Innovation Solution
The camera device moves the image sensor in three axes (x-axis shift, y-axis shift, and z-axis rolling) using a magnet arrangement structure that enhances electromagnetic force for autofocus and optical image stabilization, allowing for reduced magnet size and device weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the lens diameter is increased to achieve higher pixel density, then the image quality is improved, but the lens weight increases making it difficult to secure sufficient electromagnetic force for optical image stabilization
Solution Approach 1:
Instead of moving the heavy lens for optical image stabilization, the patent inverts the approach by moving the image sensor while keeping the lens stationary. This allows the lens to be optimized for high pixel density without weight constraints, while the lighter image sensor is moved to achieve the stabilization effect.
Solution Approach 2:
The patent separates the autofocus function (moving the lens along the optical axis) from the optical image stabilization function (moving the image sensor perpendicular to the optical axis). This segmentation allows each component to be optimized independently, with the lens focused on image quality and the sensor handling stabilization.
2Measurement precision
If the lens diameter is increased to achieve higher pixel density, then the image quality is improved, but the device size increases reducing the available space for electromagnetic components
Solution Approach 1:
The patent inverts the traditional OIS approach by moving the image sensor instead of the lens. This allows the lens diameter to be increased for higher pixel density without proportionally increasing the overall device volume, as the stabilization mechanism works with the sensor movement rather than requiring large electromagnetic components near the lens.
Solution Approach 2:
The patent moves the optical image stabilization from the lens dimension to the sensor dimension, utilizing movement perpendicular to the optical axis at the sensor level. This dimensional shift allows for more compact integration of electromagnetic components within the device housing.
3Measurement precision
If the lens weight is increased for higher pixel density, then the image quality is improved, but the electromagnetic force required for moving the lens becomes difficult to secure in limited space
Solution Approach 1:
The patent inverts the OIS mechanism by moving the image sensor instead of the lens. This allows the lens to be stationary and heavily constructed for high pixel density, while the lighter image sensor is moved using electromagnetic force, significantly reducing the force requirements compared to moving a heavy lens.
Solution Approach 2:
The patent segments the optical system into a stationary lens assembly optimized for image quality and a movable sensor assembly for stabilization. This separation allows the lens to achieve high pixel density without weight constraints, while the sensor movement requires minimal electromagnetic force due to its lower mass.
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 approach enables effective handshake correction while reducing the size and weight of the camera device by optimizing the magnet arrangement for improved electromagnetic force.
Implementation Method 1
a first coil being disposed in the first moving part and being disposed at a position corresponding to the first magnet, wherein the first coil moves the first moving part in an optical axis direction
Implementation Method 2
a second coil being disposed in the second moving part and being disposed at a position corresponding to the second magnet
Data Source
AI summary
The present embodiment relates to a camera device comprising: a fixed part; a first moving part comprising a lens and disposed inside the fixed part; a second moving part comprising an image sensor and disposed inside the fixed part; a first magnet and a second magnet disposed in the fixed part; a first coil disposed in the first moving part and disposed at a position corresponding to the first magnet; and a second coil disposed in the second moving part and disposed at a position corresponding to the second magnet, wherein the first coil moves the first moving part in an optical axis direction, wherein the first magnet is overlapped with the second magnet in the optical axis direction, and wherein the length of the first magnet in the optical axis direction is longer than the length of the second magnet.