Lens Bobbin and Housing Layout for Compact OIS and AF
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional camera modules with Optical Image Stabilizer (OIS) and Auto Focusing (AF) functions face challenges in achieving fast and reliable operation while maintaining a compact size, as the lens shift method requires significant space, leading to increased module width and potential optical axis shaking.
Innovation Solution
A camera module design featuring a bobbin, housing, and actuator with a magnet unit, coil units, and a substrate, which allows for perpendicular movement of the housing and bobbin along the optical axis, utilizing springs and hall sensors for precise control and compact assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lens shift method is used for OIS, then hand-shaking correction function is improved, but the width of the camera module increases
Solution Approach 1:
The patent changes the movement direction of the lens from horizontal (X-axis) to vertical (Z-axis) direction. The lens unit is configured to move along the optical axis direction instead of perpendicular to it, thereby implementing OIS function without increasing the module width. This dimensional change allows the lens to correct hand-shaking while maintaining a compact form factor.
Solution Approach 2:
The patent employs a voice coil motor (VCM) actuator that enables dynamic and rapid movement of the lens unit along the optical axis. The actuator system allows the lens to respond quickly to hand-shaking disturbances through controlled electromagnetic forces, achieving effective stabilization through dynamic adjustment rather than static positioning.
2Productivity
If the lens moves horizontally for AF function, then auto focusing is achieved, but the optical axis may shake
Solution Approach 1:
The patent separates the AF and OIS functions into different movement dimensions. The lens unit moves along the optical axis (Z-axis) for focusing, while the housing moves perpendicular to the optical axis (X-Y plane) for hand-shaking correction. This dimensional separation ensures that focusing operations do not induce optical axis shaking, as the two functions operate in independent spatial planes.
Solution Approach 2:
The patent divides the camera module into functionally independent components: a lens unit for AF movement and a housing for OIS movement. The lens unit is positioned within the housing, allowing independent control of each function. This segmentation enables the AF module to focus without affecting optical axis stability, as the housing absorbs and isolates stabilization movements.
3Adaptability or versatility
If space is allocated for lens movement in AF module, then auto focusing capability is improved, but the overall module size increases
Solution Approach 1:
The patent utilizes the vertical dimension (Z-axis) for lens movement instead of horizontal space, allowing AF capability to be achieved without increasing the module's footprint area. The lens unit moves along the optical axis within the existing module volume, efficiently using the available vertical space rather than requiring additional lateral room.
Solution Approach 2:
The patent nests the lens unit within the housing structure, where the lens unit can move vertically along the optical axis while being contained within the housing boundaries. This nested configuration allows the AF mechanism to be integrated compactly within the overall module volume, avoiding the need for additional external space.
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 fast and reliable auto focusing and hand-shaking prevention functions, with improved durability and assembly efficiency, while maintaining a compact camera module size by optimizing the mechanical and electrical components for efficient movement and stabilization.
Implementation Method 1
an actuator that includes a magnet unit arranged in the housing, a first coil unit arranged in an outer side surface of the bobbin, and a second coil unit that is arranged on top of the base
Implementation Method 2
utilizing springs and hall sensors for precise control and compact assembly
Implementation Method 3
utilizing springs and hall sensors for precise control and compact assembly
Data Source
AI summary
A lens driving device is provided. The lens driving device can include a housing, a bobbin disposed in the housing, and a first coil disposed on an outer peripheral surface of the bobbin. The bobbin can comprise a flange unit outwardly protruding more than the first coil, and the housing can comprise a mounting unit overlapped with the flange unit of the bobbin, such that a downward movement of the bobbin is limited by the flange unit and the mounting unit.