Optical Unit Case Layout for Flexible PCB Swing Load Relief
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Solution Overview
Problem
Conventional optical units with a movable body and flexible circuit board face damage or swinging disturbances due to strong loads, necessitating a complex configuration to reduce load on the circuit board.
Innovation Solution
A case design with a holder, fixing portion, and pedestal arrangement that positions the swing center of the optical module on the extended line of the flexible circuit board's flat area, using reinforcing or pressing plates to securely fix the circuit board with a simple configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the flexible circuit board is arranged in a conventional manner, then the optical unit can be assembled, but strong load is applied to the flexible circuit board causing damage or swinging disturbances
Solution Approach 1:
The patent changes the spatial arrangement of the flexible circuit board from a conventional configuration to one where it extends in a direction passing through the swing center of the optical module. This dimensional repositioning transforms the load distribution, causing the swing center to coincide with the extended line of the flat area of the circuit board, thereby reducing bending stresses and improving reliability during swinging motion.
2Reliability
If a complex configuration is used to reduce load on the flexible circuit board, then the circuit board is protected, but the device complexity increases
Solution Approach 1:
The patent protects the flexible circuit board by changing the positional parameter of its arrangement rather than adding complex protective structures. Specifically, the circuit board is positioned so that its extended line passes through the swing center of the optical module, which naturally reduces load without requiring additional components or complex configurations.
3Force
If the swing center is positioned on the extended line of the flat area of the flexible circuit board, then load on the circuit board is reduced, but the arrangement precision requirement increases
Solution Approach 1:
The patent enables the system to self-adjust and self-align through the geometric relationship between the swing center and the extended line of the flexible circuit board. This self-aligning mechanism reduces the need for high-precision manual arrangement, as the swing motion itself helps position the circuit board optimally, thereby reducing load while maintaining ease of assembly.
Data Source
AI summary
A case to hold a movable unit, which is provided with an optical module and a flexible circuit board having one end connected to the optical module, in a swingable manner that the optical module is swingable, is provided. The case includes: a holder, swingable together with the optical module to house the optical module; a fixing portion, provided at the holder to fix the flexible circuit board; and a pedestal, provided at the holder and having a placing face along which the flexible circuit board is disposed at a side opposite to a side of the one end with respect to an area fixed to the fixing portion in the flexible circuit board, and the pedestal is provided in a configuration in which a swing center of the optical module is positioned on an extended line of the placing face.