Asymmetrical Shelf Lighting Optics for Even Multi-Surface Illumination

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Solution Overview

Problem

Existing lighting systems face inefficiencies in providing even illumination across multiple surfaces due to the inverse square law, leading to wasted light and uneven illumination, particularly in enclosures like refrigerators with shelves at different distances from the light source.

Innovation Solution

The use of an asymmetrical optic in a lighting fixture, which splits light into beams of different intensities based on the distance between shelves, ensuring even illumination across multiple surfaces by adjusting the light distribution to maintain a predetermined ratio of intensity between the beams.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single lighting fixture is used to illuminate multiple surfaces at different distances, then the device complexity is reduced, but the illumination intensity becomes uneven across surfaces

Engineering Contradiction:
Improvelighting fixture configurationVSAvoidlight intensity distribution
Core Design Contradiction:
Device complexityVSIllumination intensity

Solution Approach 1:

The patent employs an asymmetrical optic with non-uniform refractive index distribution to redirect light rays at different angles toward surfaces at varying distances. The optic's asymmetrical design allows it to compensate for the inverse square law effects, directing more light toward farther surfaces and less toward closer ones, thereby achieving uniform illumination intensity across multiple shelves without requiring multiple lighting fixtures.

Inventive Principle:
Principle #4Asymmetry

2Illumination intensity

If light sources are positioned closer to nearer surfaces to increase illumination intensity, then the illumination intensity on nearer surfaces is improved, but light wastage increases due to spill over into other surfaces

Engineering Contradiction:
Improvelight intensity on nearer surfacesVSAvoidlight wastage
Core Design Contradiction:
Illumination intensityVSLoss of energy

Solution Approach 1:

The asymmetrical optic creates localized light distribution patterns by selectively redirecting light rays to specific target surfaces. Different regions of the optic handle light differently - some areas redirect light to nearer surfaces while other areas direct light to farther surfaces. This local differentiation ensures that light is delivered precisely where needed without spilling over to unintended surfaces, reducing energy wastage while maintaining appropriate illumination intensity on each surface.

Inventive Principle:
Principle #3Local quality

3Illumination intensity

If multiple lighting fixtures are used to provide even illumination across multiple surfaces, then the illumination uniformity is improved, but the device complexity and cost increase

Engineering Contradiction:
Improveillumination uniformityVSAvoidnumber of lighting fixtures
Core Design Contradiction:
Illumination intensityVSDevice complexity

Solution Approach 1:

The asymmetrical optic performs multiple functions simultaneously: it redirects light to multiple surfaces at different distances, controls light intensity distribution, prevents light spill over to unintended surfaces, and maintains uniform illumination across all target surfaces. This multi-functionality allows a single lighting fixture with an asymmetrical optic to replace what would traditionally require multiple separate lighting fixtures, thereby reducing device complexity and cost while achieving even illumination.

Inventive Principle:
Principle #6Universality (Multi-functionality)

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 solution provides substantially even illumination across multiple surfaces, maintaining a consistent light intensity within a factor of less than 3, reducing light wastage and ensuring uniform illumination along the length of the enclosure.

Implementation Method 1

The optic can include an asymmetrical optic configured to form the first light beam directed to the first shelf and form the second light beam directed to the second shelf

Methodology Applied
Scientific EffectRefraction: Refraction

Data Source

PatentUS10030844B2Systems, methods and apparatus for illumination using asymmetrical optics
Publication Date: 2018.07.24 INTEGRATED ILLUMINATION SYSTEMS INC
  • US10030844B2 patent drawing
  • US10030844B2 patent drawing
  • US10030844B2 patent drawing

AI summary

The present solution provides a light fixture having an asymmetric optic configured to illuminate multiple surfaces of an enclosure. The light fixture can be attached to a location adjacent to and above a first shelf of a plurality shelves of the enclosure. The optic can split light from the light source to form a first light beam directed to the first shelf and form a second light beam directed to a second shelf of the plurality of shelves. The second shelf can be below the first shelf. The first light beam can have a first predetermined intensity and the second light beam has a second predetermined intensity different than the first predetermined intensity.