Light Distributor Concave Regions for Light Control

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Solution Overview

Problem

Conventional lighting devices face challenges in controlling broad light distribution and suffer from reduced light usage efficiency due to scattering and stray light when sandblasting is used to alter light distribution.

Innovation Solution

A lighting device with a light distributor featuring an entrance and exit surface, where at least one of the surfaces includes concave regions with smooth surfaces, which control the light distribution by refracting or reflecting light from an optical component, thereby maintaining efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Shape

If sandblasting is used to alter light distribution, then light distribution can be modified, but light usage efficiency is reduced due to scattering and stray light

Engineering Contradiction:

Improvelight distribution formVSAvoidlight usage efficiency

Core Design Contradiction:

ShapeVSLoss of energy

Solution Approach 1:

The patent applies curvature by forming concave spherical portions on the light distribution converter panel instead of using sandblasting. These concave surfaces with specific radii (first radius R1 and second radius R2) refract and reflect light in controlled directions, achieving desired light distribution patterns while minimizing scattering and maintaining high light usage efficiency.

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Adaptability or versatility

If sandblasting is used to broaden light distribution, then light distribution becomes broader, but controlling the light distribution angle becomes difficult

Engineering Contradiction:

Improvelight distribution breadthVSAvoidlight distribution angle control

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The patent applies local quality by creating concave spherical portions with specific geometric parameters (radii R1 and R2, depth, and positioning) at specific locations on the light distribution converter panel. This localized geometric modification enables precise control over light distribution angles while achieving broad overall light distribution, overcoming the limitations of uniform sandblasting.

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

The solution effectively controls broad light distribution while minimizing stray light and maintaining high light usage efficiency, outperforming sandblasting methods by ensuring consistent and directed light emission.

Implementation Method 1

The concave regions control distribution of light from the light source that is refracted or reflected by an optical component

Methodology Applied

Scientific EffectRefraction: Refraction

Implementation Method 2

The concave regions control distribution of light from the light source that is refracted or reflected by an optical component

Methodology Applied

Scientific EffectReflection: Reflection

Data Source

PatentUS10443819B2Lighting device, lighting device manufacturing method, and light distributor

Publication Date: 2019.10.15 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

A lighting device includes a light source and a light distributor disposed on a light emission side of the light source. The light distributor includes an entrance surface through which light enters and an exit surface through which the light that enters through the entrance surface exits. At least one of the entrance surface and the exit surface includes concave regions. Each of the concave regions includes a smooth concave surface. The concave regions control distribution of light from the light source that is refracted or reflected by an optical lens or a reflective component.