Camera Module OIS Driver Integration for Slim Thickness
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Solution Overview
Problem
Existing camera modules with optical image stabilization (OIS) functions are complex and large in size, making them difficult to integrate into mobile devices, and previous attempts to miniaturize them have been hindered by the need for multiple drivers and electrical connections, which complicate assembly and interfere with each other.
Innovation Solution
A camera module design that incorporates a combination of a coil and a magnet for the OIS driver, utilizing a first ball bearing for indirect contact and a flexible printed circuit board to minimize module thickness, along with wire springs for horizontal restoring force and electrical signal transmission, allowing for a compact and slim structure while maintaining both auto focusing and image stabilization functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a camera module is equipped with an OIS device, then image stabilization function is improved, but structure becomes complicated and volume increases
Solution Approach 1:
The patent combines the OIS driver and AF driver into a single integrated driver unit that controls both OIS and AF functions through unified electromagnetic actuators. This merging of driver functions reduces structural complexity while maintaining both image stabilization and auto-focusing capabilities
Solution Approach 2:
The driver unit is designed to perform multiple functions - it controls both optical image stabilization and auto-focusing through electromagnetic forces. This multi-functional design eliminates the need for separate dedicated drivers for each function, thereby simplifying the overall structure
2Adaptability or versatility
If four magnets are mounted on four surfaces of the camera module for AF and OIS functions, then auto focusing and image stabilization functions are improved, but device complexity increases
Solution Approach 1:
The patent uses a single magnet positioned in the OIS body that works in conjunction with electromagnetic coils to achieve both OIS and AF functions. This eliminates the need for multiple separate magnets on different surfaces, reducing component count while maintaining dual functionality
3Adaptability or versatility
If many electrical connection devices and drivers are provided between the base and the OIS driver, then AF and OIS functions are improved, but thickness cannot be reduced
Solution Approach 1:
The patent integrates electrical connections directly into the driver unit structure, eliminating the need for separate connection devices between the base and OIS driver. This integration allows the module to maintain full functionality while achieving a thinner overall thickness
4Adaptability or versatility
If a base and an OIS extension unit extending vertically from the base in the OIS driver are formed, then AF and OIS functions are improved, but compact shape cannot be formed
Solution Approach 1:
The patent reorients the OIS extension unit to extend horizontally rather than vertically from the base. This dimensional change allows the components to be arranged in a more compact footprint while maintaining the necessary functional relationships for both AF and OIS operations
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 design achieves a compact size and slim thickness while simplifying the assembly sequence and reducing interference between drivers, enabling effective implementation of both auto focusing and image stabilization functions in a mobile device.
Implementation Method 1
a first ball bearing interposed between the cover and the OIS body
Implementation Method 2
the first ball bearing is supported while being indirect contact with an inner ceiling of the cover and an upper surface of the OIS body
Implementation Method 3
an OIS driver for moving the OIS body in perpendicular to an optical axis of the lens carrier
Implementation Method 4
an AF driver provided between the OIS body and the lens carrier
Implementation Method 5
wire springs for horizontal restoring force
Data Source
AI summary
Provided is a camera module which includes a cover, a base connected with the cover, and a lens carrier provided between the cover and the base, the camera module including: an OIS body provided inside the cover; a first ball bearing interposed between the cover and the OIS body; an AF driver provided between the OIS body and the lens carrier; and an OIS driver for moving the OIS body in perpendicular to an optical axis of the lens carrier. Since the first ball bearing is supported while being in direct contact with an inner ceiling of the cover and an upper surface of the OIS body, the overall module thickness may be formed to be thinner than a structure in which the ball bearing is provided below the OIS body.