Stacked Circuit Board HMI Module with Retaining Seat
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Solution Overview
Problem
Existing human-machine interface modules are bulky, difficult to assemble, and lack durability, which hinders their integration into compact and robust industrial systems.
Innovation Solution
A human-machine interface module structure comprising a circuit module with stacked first and second circuit boards, a retaining seat, and a liquid crystal panel, where the circuit boards are securely connected and the liquid crystal panel is fixed using a flat flexible cable, ensuring a compact and durable design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If traditional human-machine interface modules are used, then basic functionality is achieved, but the volume is large and assembly is difficult
Solution Approach 1:
The interface module is divided into distinct functional components: a control unit with circuit boards for processing, a display unit with liquid crystal panel for visualization, and a retaining seat for structural support. This segmentation allows each component to be optimized independently and assembled systematically, reducing overall volume while simplifying the assembly process through modular integration.
Solution Approach 2:
The circuit boards are stacked in a layered configuration where the first circuit board is positioned in front of the second circuit board within the same spatial footprint. This nesting approach allows multiple functional layers to occupy minimal space, significantly reducing the module's volume while maintaining all necessary circuitry and connectivity.
2Reliability
If traditional human-machine interface modules are used, then basic functionality is achieved, but durability is insufficient
Solution Approach 1:
The retaining seat features curved engagement surfaces and rounded corners that distribute mechanical stress more evenly across connection points. This curvature design prevents stress concentration at sharp edges, enhancing the durability of connections between components while maintaining a relatively simple overall structure.
Solution Approach 2:
The retaining seat integrates multiple functions into a single component: it provides structural support, secures the circuit boards through engagement grooves, and anchors the liquid crystal panel. This merging of functions reduces the number of separate parts needed, simplifying the structure while improving durability through fewer potential failure points.
3Volume of moving object
If circuit boards are stacked in parallel, then volume is reduced, but connection reliability may be compromised
Solution Approach 1:
A flexible flat cable serves as an intermediary connection element between the first and second circuit boards. This cable provides a reliable electrical connection that accommodates the stacked configuration, ensuring signal integrity while allowing for thermal expansion and contraction without compromising the electrical connection reliability.
Solution Approach 2:
The flexible flat cable uses a thin, flexible conductor that can bend and flex to maintain reliable electrical connections between the stacked circuit boards. This flexible connection method is more reliable than rigid traces, as it accommodates manufacturing tolerances and environmental stresses while maintaining low profile height.
Data Source
AI summary
A human-machine interface module structure includes a circuit module, a retaining seat, and a liquid crystal panel. The circuit module is fixedly connected to a frame. The circuit module includes a first circuit board and a second circuit board that are stacked in parallel. The first circuit board is fixedly connected to an inner side of the frame. The second circuit board is located behind the first circuit board. The first circuit board is electrically connected to the second circuit board. The retaining seat is parallel with and connected to the first circuit board. A front of the retaining seat has an accommodating space. The liquid crystal panel is accommodated in the accommodating space. The liquid crystal panel is electrically connected to the first circuit board through a flat flexible cable. The human-machine interface module structure is small in size and is easy to assemble and durable.