Image Sensor Shift OIS for Heavy Lens Camera Modules
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Solution Overview
Problem
The increasing weight and diameter of lenses in camera devices due to high pixelation makes it difficult to secure electromagnetic force for moving the lens in a limited space, hindering effective handshake correction.
Innovation Solution
The camera device moves the image sensor in two or three axes (x-axis shift, y-axis shift, and z-axis rolling) using a first and second driving part, a connecting member, and a ball contact structure to perform handshake correction, with a connecting substrate and metal plate providing elasticity and rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the lens diameter is increased to support high pixelation, then the image quality is improved, but the weight of the lens increases making it difficult to secure electromagnetic force for moving the lens in limited space
Solution Approach 1:
Instead of moving the lens for handshake correction, the patent inverts the approach by moving the image sensor while keeping the lens stationary. This allows high pixelation with large diameter lenses to be used without the weight penalty of moving the lens, while still achieving effective image stabilization through sensor movement.
Solution Approach 2:
The patent extracts the movement function from the lens and assigns it to the image sensor. By separating the optical element (lens) from the sensing element (image sensor), the system can optimize each independently - the lens can be large for high pixelation while the sensor is moved for handshake correction.
2Measurement precision
If the lens diameter is increased to support high pixelation, then the image quality is improved, but the device complexity increases due to difficulty in securing electromagnetic force in limited space
Solution Approach 1:
The patent inverts which component is moved - instead of moving the lens with complex electromagnetic systems, it moves the image sensor. This simplifies the electromagnetic force system while maintaining high image quality through larger lens diameter.
3Stability of the object's composition
If the connecting substrate is made more rigid to support the image sensor, then the structural stability is improved, but the manufacturing cost increases
Solution Approach 1:
The patent uses a composite structure combining the connecting substrate with a metal plate having elasticity. This composite approach provides the necessary structural stability for image sensor support while using cost-effective materials and simple manufacturing processes compared to using entirely rigid expensive substrates.
Solution Approach 2:
The patent changes the physical parameters of the connecting structure by introducing elasticity through the metal plate rather than using fully rigid construction. This provides adequate stability while reducing manufacturing complexity and cost.
4Volume of moving object
If the camera device protrusion is minimized to reduce device size, then the compactness is improved, but the assembly balance and tilt correction capability are compromised
Solution Approach 1:
The patent introduces a ball contact structure that operates in the vertical dimension (optical axis direction) to provide tilt correction and assembly balance, allowing the horizontal protrusion to be minimized. The ball mechanism compensates for balance issues through vertical adjustment rather than requiring increased horizontal size.
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 allows for improved assembly balance and tilt correction of the image sensor, reduces manufacturing costs, and minimizes the camera's protrusion from devices without increasing the optical axis length, while enhancing the rigidity and conductive line capacity of the connecting substrate.
Implementation Method 1
a ball being disposed between the fixed part and the second moving part, wherein the connecting member can press the second moving part toward the ball
Implementation Method 2
The camera device may comprise a metal plate being coupled to the connecting substrate and having elasticity
Data Source
AI summary
A first embodiment of the present invention relates to a camera device comprising: a fixed part; a first moving part located inside the fixed part and comprising a lens; a second moving part comprising an image sensor; a first driving part for moving the first moving part relative to the fixed part; a second driving part for moving the second moving part relative to the fixed part; a connecting member for movably connecting the second moving part to the fixed part; and a ball located between the fixed part and the second moving part. The connecting member presses the second moving part toward the ball.