Lamp Reflector Cap Opening for Isotropic Light Distribution

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Solution Overview

Problem

Optoelectronic light sources, such as LEDs, exhibit anisotropic light radiation distribution, which is undesirable for general illumination applications where isotropic radiation is preferred, leading to challenges in achieving omnidirectionality without complex lens systems or additional components like reflectors and diffusers.

Innovation Solution

A lamp design incorporating a reflector cap with a higher reflectivity than transmissivity and a diffuser with higher transmissivity than reflectivity, featuring an opening that allows light to be scattered and redirected, thereby improving radiation isotropy by enhancing light distribution in underlit areas and reducing shading effects.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a reflector cap is added to redirect light into underlit areas, then radiation isotropy is improved, but device complexity increases

Engineering Contradiction:

Improveradiation isotropyVSAvoiddevice complexity

Core Design Contradiction:

Illumination intensityVSDevice complexity

Solution Approach 1:

The reflector cap is integrated directly onto the light source housing, merging the reflection function into the existing structure rather than adding a separate component. This combination improves radiation isotropy by redirecting light into underlit areas while minimizing the increase in device complexity through structural integration

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The reflector cap serves multiple functions: it redirects light to improve isotropy, provides structural support as part of the housing, and can be designed to match the aesthetic appearance of the lamp. This multi-functionality allows the component to deliver optical improvement without proportionally increasing complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Illumination intensity

If a diffuser is used to scatter light, then radiation isotropy is improved, but light intensity in certain directions decreases

Engineering Contradiction:

Improveradiation isotropyVSAvoidlight intensity

Core Design Contradiction:

Illumination intensityVSUse of energy by moving object

Solution Approach 1:

The diffuser is positioned specifically in regions where light scattering is most needed to achieve isotropy, rather than uniformly across all surfaces. This localized application ensures that light is scattered effectively in underlit directions while preserving higher light intensity in directions where direct illumination is already sufficient

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The diffuser material is applied with controlled opacity and coverage area to achieve partial scattering effect. By using a diffuser with moderate scattering properties rather than complete diffusion, the system achieves improved isotropy while maintaining adequate light intensity in primary radiation directions

Inventive Principle:

Principle #16Partial or excessive action

3Illumination intensity

If the reflector cap is made more reflective, then light distribution in underlit areas is improved, but shading effect in the main radiation direction increases

Engineering Contradiction:

Improvelight distributionVSAvoidshading effect

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

The reflector cap is designed with segmented or zoned reflectivity, where different regions have different reflective properties. The portions facing underlit areas have high reflectivity to redirect light effectively, while regions in the main radiation direction have reduced reflectivity or include openings to minimize shading effects and allow direct light passage

Inventive Principle:

Principle #1Segmentation

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

The solution effectively enhances the omnidirectionality of optoelectronic lamps, improving light distribution and reducing shading, while maintaining a simple and cost-effective structure, without the need for complex geometries or additional components, thus addressing the limitations of anisotropic light sources.

Implementation Method 1

a reflector cap for reflection of light of the light source radiated into the solid angle, so that the angle of the propagation direction of the reflected light to the main radiation direction increases

Methodology Applied

Scientific EffectReflection: Reflection