Optical Element Driving Device Bobbin Coil Positioning
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Solution Overview
Problem
The positioning accuracy of coils in lens driving devices for camera modules is not adequately improved due to limitations in substrate formation accuracy, leading to potential shifts in the positional relationship between magnets and coils, which affects driving force and overall performance.
Innovation Solution
The optical element driving device incorporates a fixed portion with a base and a bobbin to which coils are attached, stabilizing the positional relationship between magnets and coils, enhancing positioning accuracy and simplifying power feeding mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If coils are mounted on a bent substrate to surround the movable portion, then the coil can be positioned relative to the magnet, but the positioning accuracy of the coil deteriorates due to substrate formation limitations
Solution Approach 1:
The patent divides the mounting structure into two separate components: a substrate that supports the coil and a bobbin that provides the mounting surface for the coil. This segmentation allows each component to be manufactured independently with high precision, overcoming the limitations of forming precise coil positions on a single bent substrate. The bobbin serves as a dedicated mounting structure that ensures accurate coil positioning relative to the magnet.
Solution Approach 2:
The bobbin acts as an intermediary component between the substrate and the coil. Instead of directly mounting the coil on the substrate (which suffers from positioning inaccuracies), the bobbin mediates this relationship by providing a stable, precisely manufacturable mounting surface. The bobbin is fixed to the substrate, and the coil is mounted on the bobbin, thereby transferring the positioning function to a component with superior manufacturing precision.
2Adaptability or versatility
If multiple coils and magnets are provided for two-directional operation, then the OIS function can be achieved, but the device complexity increases
Solution Approach 1:
The patent designs the bobbin structure to serve multiple functions: it provides the mounting surface for coils, maintains their positioning accuracy, and facilitates power feeding. By making the bobbin a universal component that handles both positioning and electrical connection, the patent reduces the need for separate structures, thereby managing device complexity while maintaining two-directional operation capability through the coordinated arrangement of multiple coils and magnets.
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 configuration improves the positioning accuracy of coils, stabilizes the positional relationship between magnets and coils, and simplifies the power feeding path, resulting in enhanced performance and reduced complexity in camera module designs.
Implementation Method 1
the drive unit includes a magnet arranged on the movable portion and coils arranged on the fixed portion
Data Source
AI summary
According to an embodiment, an optical element driving device is provided with: a movable portion in which an optical element is holdable; a fixed portion which accommodates the movable portion; and a drive unit which operates the movable portion relative to the fixed portion, in which the drive unit includes a magnet arranged on the movable portion and coils arranged on the fixed portion, and the fixed portion includes a base and a bobbin to which at least one of the coils is attached and which is fixed to the base.