Shake-Correction Optical Unit PCB Layout Without Connector Bulk
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Solution Overview
Problem
Conventional optical units with shake correction functions in mobile devices require separate connectors for flexible printed circuit boards, leading to increased space requirements and reduced design flexibility due to the need for larger form factors and additional space for folding circuit boards.
Innovation Solution
The optical unit incorporates a first and second magnetic drive mechanism with band-shaped portions and connection portions on flexible printed circuit boards that can be electrically connected while overlapping, allowing for compact integration and reduced size, with the first circuit board pulled out from the camera module and the second circuit board having a drawer portion for external connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate connectors are provided for the first and second flexible printed circuit boards, then electrical connection is achieved, but the space required for connectors increases and design flexibility is reduced
Solution Approach 1:
The patent merges the first and second flexible printed circuit boards into a single integrated circuit board structure. The first and second band-shaped portions are formed on the same flexible printed circuit board, eliminating the need for separate connectors and reducing the overall space required for electrical connections.
Solution Approach 2:
The single flexible printed circuit board serves multiple functions: it provides electrical connections for both the first and second drive coils, supports both band-shaped portions for shake correction, and integrates the drawer portion for external connections. This multi-functional design reduces the number of separate components needed.
2Reliability
If the first flexible printed circuit board is folded back twice, then connection is achieved, but the size of the optical unit increases in the direction orthogonal to the optical axis
Solution Approach 1:
Instead of folding the circuit board in the same plane (which increases size in the orthogonal direction), the patent utilizes the third dimension by having the band-shaped portions extend in different directions from a common connection region. The first band-shaped portion extends in the first direction and the second band-shaped portion extends in the second direction, creating a three-dimensional layout that reduces the orthogonal footprint.
Solution Approach 2:
The circuit board layout nests the first and second band-shaped portions within a compact area by having them originate from the same connection region and extend in different directions. This nested arrangement allows both connections to be made without requiring additional folding space, thereby reducing the overall size of the optical unit.
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 minimizes the space needed for connectors, enhances design freedom, and reduces the size of the optical unit in directions orthogonal to the optical axis, while maintaining effective shake correction functionality.
Implementation Method 1
The drive mechanism for shake correction has a first magnet and a first coil which rotate the movable body around an X axis and a second magnet and a second coil which rotate the movable body around a Y axis
Data Source
AI summary
In an optical unit with a shake correction function, a first circuit board, which is pulled out from a camera module, and a second circuit board, on which a first drive coil and a second drive coil are mounted, are electrically connected by a first connection portion and a second connection portion, which are electrically connected while overlapping each other. Moreover, in the optical unit with a shake correction function, a drawer portion of the first circuit board is pulled out toward an outer peripheral side of the optical unit with a shake correction function.