Lens Driving Structure for Compact Autofocus and Handshake Correction
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Solution Overview
Problem
Existing camera modules with high pixels face challenges in implementing autofocus and handshake correction functions due to their miniaturized size, which complicates the integration of large aperture lenses and movement mechanisms.
Innovation Solution
A lens driving device with a base, housing, substrate, and magnets and coils that allow for simultaneous movement of the lens in the optical axis and perpendicular directions, utilizing elastic connections and flexible substrates to enable autofocus and handshake correction functions in a compact form factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the camera module is miniaturized to achieve small size and high pixels, then the module size is reduced and pixel density is improved, but the implementation of autofocus and handshake correction functions becomes difficult
Solution Approach 1:
The patent implements a nested structure where the holder is disposed inside the housing, and the lens is disposed inside the holder. This nested arrangement allows multiple functional components to be integrated within a compact volume, enabling autofocus and handshake correction functions in a miniaturized camera module without increasing the overall module size.
Solution Approach 2:
The patent utilizes three-dimensional spatial arrangement by disposing the first coil and first magnet for optical axis direction movement, and the second coil and second magnet for perpendicular direction movement. This multi-dimensional coil and magnet arrangement enables both autofocus (optical axis) and handshake correction (perpendicular directions) functions within a compact footprint by exploiting spatial dimensions rather than simply scaling up component sizes.
2Illumination intensity
If large aperture lenses are used to improve light gathering capability, then image quality is improved, but the module size increases making miniaturization difficult
Solution Approach 1:
The nested structure allows the lens to be positioned within the holder, which is itself within the housing. This efficient spatial nesting enables the lens to achieve an optimized aperture for light gathering while maintaining a compact overall module size, as the nested arrangement minimizes wasted space and allows components to share structural boundaries.
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 enables miniaturization and high pixelization of camera modules while maintaining precise autofocus and handshake correction capabilities, enhancing image stabilization and focus adjustment.
Implementation Method 1
a first coil and a first magnet for moving the housing and the holder in an optical axis direction
Implementation Method 2
a second magnet being disposed in the holder; and a second coil being disposed between the housing and the substrate and disposed at a position corresponding to the second magnet, wherein the second coil moves the holder in a direction perpendicular to the optical axis direction
Implementation Method 3
The first region comprises a body portion in which the second coil is disposed, and the substrate may comprise an elastic connection portion connecting the first region and the second region
Data Source
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AI summary
An embodiment of the present invention relates to a lens driving device comprising: a base; a housing disposed on the base; a substrate disposed between the base and the housing; a holder disposed in the housing; a first magnet and a first coil for moving the housing and the holder in an optical-axis direction; a second magnet disposed in the holder; and a second coil disposed between the housing and the substrate and placed in a position corresponding to the second magnet, wherein the second coil moves the holder in a direction perpendicular to the optical-axis direction, a first region of the substrate is connected to the housing and a second region of the substrate is connected to the base, and the first region of the substrate is moved according to the movement of the housing.