Electromagnetic Relay Stand Structure for Stable SMT Mounting
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Solution Overview
Problem
Surface mount-type electromagnetic relays with asymmetrically arranged terminals often experience poor balance when placed on a circuit board, leading to instability and difficulties in mounting through reflow soldering.
Innovation Solution
Incorporating a stand portion on the electromagnetic relay, which projects downward from the case or base, helps maintain the relay's posture stability on the circuit board, even with asymmetric terminal arrangements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If terminals are arranged asymmetrically on the bottom surface of the base, then the electromagnetic relay can be designed with compact layout, but the electromagnetic relay cannot maintain stable posture when placed on the circuit board and may tilt
Solution Approach 1:
The patent applies asymmetry principle by intentionally designing the stand portion to be asymmetrically positioned on the bottom surface of the base, matching the asymmetric terminal arrangement. This asymmetric stand structure compensates for the imbalance caused by asymmetric terminals, maintaining overall stability while preserving the compact layout benefits.
Solution Approach 2:
The stand portion acts as a counterweight element that offsets the instability caused by asymmetric terminal distribution. By positioning the stand portion strategically on the opposite side of the asymmetric terminal arrangement, it creates a balancing effect that prevents tilting during placement on the circuit board.
2Productivity
If the electromagnetic relay is placed unstably on the circuit board, then mounting can proceed, but the accuracy of mounting is reduced
Solution Approach 1:
The stand portion provides preliminary stabilization of the electromagnetic relay before the soldering process begins. By ensuring the relay maintains a stable posture during placement and before reflow soldering, it enables accurate positioning and alignment, thereby improving mounting accuracy without sacrificing efficiency.
3Manufacturing precision
If a stand portion is added to stabilize the electromagnetic relay, then mounting accuracy is improved, but device complexity increases
Solution Approach 1:
The stand portion is merged with the base structure, forming an integrated component rather than a separate attachment. This integration minimizes additional complexity while achieving the stabilization function. The stand portion is molded as part of the base in many implementations, reducing part count and assembly steps.
Data Source
AI summary
An electromagnetic relay includes a base, a first contact terminal, a second contact terminal, and a case. The first contact terminal and the second contact terminal protrude downward from the base. The first contact terminal includes a first bent portion. The second contact terminal includes a second bent portion. The first bent portion and the second bent portion are disposed on the bottom surface of the base on a first side of the center line of the base and bent along the bottom surface of the base. The case or the base includes a stand portion. The stand portion protrudes downward. The stand portion is disposed on a second side opposite the first side with respect to the center line of the base.