LED Reflector Non-Reflection Film Area Prevents Dicing Peeling

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Solution Overview

Problem

Conventional LEDs with reflectors face issues such as peeling off of the reflection film during dicing and the need for complex mold jigs and excessive labor for terminal position identification, which affect production efficiency and reflectance.

Innovation Solution

The LED design features a reflector with a truncated-cone or multangular truncated-pyramid shaped opening and a non-reflection film area on the outer peripheral edge, allowing for efficient production and preventing film peeling, along with a method involving a mold jig to set and remove the reflection film, enabling simultaneous formation of terminal position identification marks without requiring a top coat.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If a reflection film is plated or deposited on the inclined surface of a reflector assembly and then the assembly is diced to separate individual reflectors, then the reflection film can be formed on the reflector surface, but the reflection film may peel off during the dicing process

Engineering Contradiction:
Improvereflection film formationVSAvoidreflection film adhesion
Core Design Contradiction:
Manufacturing precisionVSReliability

Solution Approach 1:

The patent applies preliminary action by forming the reflection film on the reflector assembly before dicing. The reflection film is deposited on the inclined surfaces of multiple reflectors while they are still assembled together, and then the assembly is diced to separate individual reflectors. This preliminary film formation ensures that the reflection film is already in place before the dicing process, eliminating the need for post-dicing film application and preventing peeling issues that would occur if dicing were performed first.

Inventive Principle:
Principle #10Preliminary action

2Reliability

If a top coat is applied on the reflection film to prevent peeling, then the reflection film peeling is prevented, but the reflectance of the reflection film is reduced

Engineering Contradiction:
Improvereflection film adhesionVSAvoidreflection film reflectance
Core Design Contradiction:
ReliabilityVSIllumination intensity

Solution Approach 1:

The patent extracts the protective function from the reflection film system by providing mechanical support through the reflector assembly structure itself rather than adding a top coat. The reflector assembly is designed to hold the reflection film securely during dicing and assembly processes, eliminating the need for a top coat that would otherwise be required to prevent peeling. This extraction approach maintains the high reflectance of the reflection film without the light-absorbing top coat layer.

Inventive Principle:
Principle #2Taking out (Extraction)

3Ease of operation

If a concave-shaped terminal position identification mark is provided on the reflector surface by mold, then terminal position can be identified, but a complex mold jig is required and excessive labor is needed for mold production

Engineering Contradiction:
Improveterminal position identificationVSAvoidmold jig complexity
Core Design Contradiction:
Ease of operationVSDevice complexity

Solution Approach 1:

The patent applies local quality by providing terminal position identification marks only at specific locations on the reflector assembly that correspond to terminal positions, rather than using complex concave shapes across the entire reflector surface. The identification marks are formed locally at the necessary positions through the mold jig, providing sufficient terminal identification functionality while using a simpler mold design that requires less labor for production.

Inventive Principle:
Principle #3Local quality

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach allows for easy and efficient production of LEDs with high reflectance, preventing film peeling and reducing labor costs, while maintaining reflectance and improving process yield.

Implementation Method 1

a reflector attached to the circuit board to surround the light emitter and configured to reflect light emitted from the light emitter

Methodology Applied
Scientific EffectReflection: Reflection

Data Source

PatentUS7888178B2Method to produce reflector with an outer peripheral edge portion of an upper surface uncovered by a reflection film and to produce a light-emitting device using the same reflector
Publication Date: 2011.02.15 CITIZEN ELECTRONICS CO LTD
  • US7888178B2 patent drawing
  • US7888178B2 patent drawing
  • US7888178B2 patent drawing

AI summary

An LED includes a circuit board (1), a light emitter (3) mounted on the circuit board (1), and a reflector (4) mounted on the circuit board (1), the light emitter (3) including an LED element mounted on the circuit board (1) and a light-transmitting resin (2) to seal the LED element. The reflector (4) is configured to surround the light emitter (3) and includes an opening (5) which passes through an upper surface and a lower surface is provided at a central position to allow insertion of the light emitter (3), and an inclined inner surface in the opening (6) configured to be upwardly broadened. A reflection film (7) is provided on the inclined inner surface (6) of the opening in the reflector. A outer peripheral edge is a non-reflection film constituted area (8) and, simultaneously, a terminal position identification mark (10) adjacent to the non-reflection film constituted area (8) are provided. The reflector (4) is cut along a dicing line on the non-reflection film constituted area (8) where the reflection film is not provided, thus preventing the reflection film (7) from being peeled off.