Optical Unit Flexible Circuit Board Folded Positioning
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Solution Overview
Problem
In conventional optical units, the flexible circuit board is damaged due to the load applied during the displacement of the movable body, as it is displaced with the movable body.
Innovation Solution
The optical unit incorporates a support mechanism that turnably supports the movable body, a flexible circuit board that is folded to increase its length and reduce load, and a positioning part that positions the other end of the flexible circuit board, ensuring the turning axis is within a specific range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the flexible circuit board is displaced with the movable body, then the movable body can be supported, but the flexible circuit board is damaged due to applied load
Solution Approach 1:
The flexible circuit board is divided into multiple sections by creating fold portions, which segment the board into multiple flexible segments. This segmentation allows each segment to independently absorb displacement forces, reducing the overall load on the circuit board while maintaining connectivity between segments.
Solution Approach 2:
The flexible circuit board is folded to extend in a direction transverse to the optical axis, utilizing a different spatial dimension. This dimensional change allows the circuit board to be positioned away from the movable body's displacement path, reducing mechanical stress while maintaining electrical connectivity.
2Reliability
If the flexible circuit board is folded to increase length, then the load on the flexible circuit board is reduced, but the manufacturing complexity increases
Solution Approach 1:
The flexible circuit board is divided into multiple sections by creating fold portions, which segment the board into multiple flexible segments. This segmentation allows each segment to independently absorb displacement forces, reducing the overall load on the circuit board while maintaining connectivity between segments.
Solution Approach 2:
The flexible circuit board is designed with fold portions that allow dynamic adjustment of its configuration. The board can flex and fold in response to mechanical stress, adapting its shape to reduce load while maintaining electrical connectivity throughout the movement range.
3Reliability
If the turning axis position is optimized, then the moving amount of the flexible circuit board is reduced, but the positioning precision requirement increases
Solution Approach 1:
The fold portions are pre-formed in the flexible circuit board during manufacturing, creating predetermined flexible sections that guide the board's movement path. This preliminary configuration ensures that when the movable body turns, the circuit board follows a predictable trajectory that minimizes stress without requiring extremely precise real-time positioning.
Solution Approach 2:
The flexible circuit board's physical parameters are modified through folding, changing its effective length, rigidity, and movement characteristics. These parameter changes allow the board to accommodate larger turning angles with reduced stress, compensating for positioning tolerances through inherent flexibility rather than requiring ultra-precise axis positioning.
Data Source
AI summary
An optical unit is provided and includes: a movable body having an optical module; a fixed body; a support mechanism turnably supporting the movable body with respect to the fixed body; a flexible circuit board whose one end is connected with a connection part provided in the movable body and which is disposed on a side in a first intersecting direction intersecting an optical axis direction with respect to the movable body; and a positioning part being disposed on the side in the first intersecting direction with respect to the movable body and positioning an other end of the flexible circuit board in the optical axis direction. The flexible circuit board is folded to be overlapped with each other when viewed in the optical axis direction. A position in the optical axis direction of a turning axis is located within a range from the connection part to the positioning part.