LED Shield Member for Directional Light Control

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Solution Overview

Problem

Existing LED lighting fixtures with directional shielding face challenges in accurately directing light to preferential areas while minimizing light spillage to non-preferential sides, requiring improved manufacturing efficiency and effectiveness in light distribution.

Innovation Solution

The LED apparatus incorporates a shield member with a shield portion and a planar non-shield portion positioned over the mounting board and secondary lens member, featuring a shield-member aperture aligned with the light path, to intercept light on the non-preferential side, enhancing light distribution towards a preferential downward and outward direction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If traditional LED fixtures without directional shielding are used, then light distribution is simple and manufacturing is easy, but light spillage to non-preferential areas increases and lighting control precision deteriorates

Engineering Contradiction:
Improvelight distribution control precisionVSAvoidfixture structure complexity
Core Design Contradiction:
Manufacturing precisionVSDevice complexity

Solution Approach 1:

The light fixture is segmented into distinct functional zones using shield members that divide the housing interior into preferential and non-preferential light distribution areas. These shields create separate optical paths, allowing precise control over light direction while maintaining a relatively simple overall fixture structure.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

Shield members act as intermediary elements positioned between the LED light sources and the external environment. These intermediaries selectively block and redirect light paths, achieving precise directional control without requiring complex optical systems or multiple specialized components.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Illumination intensity

If multiple LEDs are used in individual fixtures to increase light output, then lighting coverage improves, but light spillage to unwanted areas increases and control difficulty increases

Engineering Contradiction:
Improvelight outputVSAvoidlight spillage
Core Design Contradiction:
Illumination intensityVSObject-generated harmful factors

Solution Approach 1:

Each LED module within the fixture is assigned its own dedicated shield member, creating individualized light control zones. This segmentation allows multiple LEDs to operate at high intensity while their light paths are independently controlled, preventing cumulative light spillage to non-preferential areas.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The shield members provide localized light control tailored to each LED module's specific position and orientation. By customizing the shield geometry and positioning for each local LED source, the system achieves high overall light output while maintaining precise directional control at each local level.

Inventive Principle:
Principle #3Local quality

3Manufacturing precision

If directional shields are added to LED fixtures to control light distribution, then light directionality improves, but manufacturing complexity and production cost increase

Engineering Contradiction:
Improvelight directionalityVSAvoidmanufacturing ease
Core Design Contradiction:
Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The directional control function is segmented into separate, standardized shield member components rather than integrating it into the main housing. This modular approach allows shields to be manufactured independently using simple processes and then assembled into the fixture, maintaining manufacturing ease while achieving precise light directionality.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The shield members utilize simple geometric parameters such as angle, height, and position that can be easily adjusted during manufacturing. By controlling these basic parameters, the system achieves precise light directionality without requiring complex manufacturing processes or specialized materials.

Inventive Principle:
Principle #35Parameter changes

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 design effectively redirects a high percentage of light towards the desired area, minimizing trespass light on non-preferential sides, while being cost-effective and adaptable for large area lighting applications like roadways and parking lots.

Implementation Method 1

a shield member in the form of a layer positioned over the mounting board, LED package and secondary lens member, the shield member having a shield portion and a substantially planar non-shield portion thereabout

Methodology Applied
Scientific EffectLight blocking/Interception: Absorption (EM radiation)

Data Source

PatentEP2543924B1LED apparatus
Publication Date: 2015.11.04 WOLFSPEED INC
  • EP2543924B1 patent drawingFigure 1~2
  • EP2543924B1 patent drawingFigure 3
  • EP2543924B1 patent drawingFigure 4

AI summary

LED apparatus (10) including a mounting board (12), an LED package (14) on the mounting board (12) and having a primary lens (16), and a secondary lens member (20) aligned over the primary lens (16) and establishing a light path (22) therebetween, the secondary lens member (20) including a lens portion (32) and a flange (34) thereabout, wherein a cover (40) has an opening (42) aligned with the light path (22) and securing the secondary lens member (20) over the LED package (14) and a resilient gasket member (46) is sandwiched between the cover (40) and the flange (34).