Molded Frame for LED Encapsulation Height Safety
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Solution Overview
Problem
Electronic lighting apparatuses, such as LED units, face challenges in ensuring safety from high voltages while maintaining a low construction height and minimizing light emission obstruction by encapsulating compounds.
Innovation Solution
A molded frame part with a circumferential edge structure is mounted over the connection area of the circuit board, allowing additional encapsulating compound to fill an interior pocket, creating a thick protective layer over high-voltage components without obstructing the light-emitting area, and is covered by an insulating layer and a metal plate for enhanced safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the encapsulating layer thickness is increased to ensure safety from high voltages, then safety protection is improved, but the construction height increases and light emitting efficiency is reduced
Solution Approach 1:
The encapsulating layer is applied with varying thicknesses at different locations: a first thickness over the light emitting area to maintain light output, and a second greater thickness over the connection arrangement to ensure safety from high voltages. This localized differentiation resolves the contradiction by providing enhanced safety where needed without increasing overall construction height or blocking light emission.
2Reliability
If the encapsulating layer thickness is increased to cover projecting terminals, then protection from electrical contact is improved, but light emitting efficiency is reduced
Solution Approach 1:
The encapsulating layer thickness is locally optimized: a first thickness is applied over the light emitting area to maintain light output, while a second greater thickness is applied over the connection arrangement to ensure safety from high voltages and cover projecting terminals. This resolves the contradiction by providing enhanced protection where needed without blocking light emission.
3Reliability
If a uniform thick encapsulating layer is applied over the entire circuit board, then safety protection is improved, but light emitting efficiency and construction height are compromised
Solution Approach 1:
Instead of a uniform thick encapsulating layer, the invention applies a first thickness over the light emitting area and a second greater thickness over the connection arrangement. This localized approach provides enhanced safety protection where needed while maintaining a flatter overall profile and preserving light emitting efficiency.
Solution Approach 2:
The encapsulating layer thickness is varied in the vertical dimension across different horizontal locations on the circuit board. This dimensional variation allows the design to achieve both safety protection and low construction height by concentrating thickness where safety is critical rather than uniformly across the entire surface.
Data Source
AI summary
In an electronic apparatus comprising a circuit board supporting semiconductor components and traces or conductors for supplying electrical energy to the semiconductor components, and a connection arrangement by which the conductors are connected to a power supply cable, the circuit board being covered by an electrically insulating encapsulating layer, a molded frame part is mounted on the circuit board so as to cover the connection arrangement, the molded frame part having a circumferential edge structure which extends on one end into the encapsulating layer and at the other end projects above the encapsulating layer so as to create an interior space which, when the encapsulating layer is at least partially cured, is filled with additional encapsulating compound to form, after curing, a relatively thick protective layer over the wire or cable and conductor connecting area.