Optical Unit Shake Correction Flexible Printed Board Warpage
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Solution Overview
Problem
Existing optical units with shake correction functions face challenges in reducing the thickness and installation space required due to increased swinging loads and warpage when the movable body with an optical module swings around two intersecting axes, leading to potential collisions and increased power consumption.
Innovation Solution
The optical unit incorporates a flexible printed board with a fixation portion and folded portions extending in directions intersecting the optical axis, allowing for reversible folding to reduce resistance and warpage, and includes spacers to prevent contact and deformation, thereby minimizing the installation space and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the flexible printed board is folded multiple times to reduce swinging load around one axis, then the swinging load around that axis is reduced, but the swinging load around the perpendicular axis increases and the board warps
Solution Approach 1:
The flexible printed board is divided into multiple independent folded portions, each folded in a different direction. Specifically, first folded portions are folded in a first direction to reduce swinging load around the first axis, while second folded portions are folded in a second direction (perpendicular to the first) to reduce swinging load around the second axis. This segmentation prevents warpage by distributing the folding effects across different spatial dimensions.
Solution Approach 2:
Different regions of the flexible printed board have different folding characteristics. The first folded portions are located at specific positions and folded in a first direction, while second folded portions are located at other positions and folded in a second direction. This local differentiation allows each region to address specific swinging load issues without causing overall board warpage.
2Force
If the flexible printed board is routed to reduce swinging load, then the swinging load is reduced, but the installation space increases
Solution Approach 1:
The flexible printed board utilizes three-dimensional spatial arrangement by folding different portions in different directions (first direction and second direction perpendicular to each other). This dimensional approach allows the board to accommodate swing movements around multiple axes without requiring excessive linear space, thereby reducing the overall installation space while maintaining low swinging load.
3Length of moving object
If the flexible printed board is folded to reduce thickness, then the thickness is reduced, but the swinging load increases due to resistance
Solution Approach 1:
Instead of a single large fold, the flexible printed board is segmented into multiple smaller folded portions. Each folded portion is folded in a specific direction (first or second direction) to address specific swing axes. This segmentation reduces the resistance during swinging while maintaining compact thickness, as each small fold offers less resistance than a large single fold.
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 effectively reduces the swinging load and installation space, preventing collisions and minimizing power consumption while maintaining the shake correction functionality, thus enhancing the optical unit's performance and compactness.
Implementation Method 1
a flexible printed board coupled to the movable body, the flexible printed board including: a fixation portion directly or indirectly fixed to the fixation body; a first portion located between a portion coupled to the movable body and the fixation portion, the first portion extending in a direction of the optical axis along the movable body; and a first folded portion located between the first portion and the fixation portion, the first folded portion extending in a direction intersecting the optical axis and reversely folded
Data Source
AI summary
A shake correction optical unit with a shake correction function may cause a movable body including an optical module to swing around an X axis and a Y axis that are perpendicular to an optical axis L. A flexible printed board may include a second folded portion drawn from the movable body in a +Y direction, and bent in a direction of the optical axis L and folded once; and a first folded portion bent to extend from the second folded portion in the +Y direction and folded once. At least one of the second folded portion or the first folded portion may be thus easily bendable when the movable body swings in either direction around the X axis or around the Y axis.