Light distribution system for freezer
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Solution Overview
Problem
Existing LED lamp systems for freezers face issues with uneven light distribution between near and far-illuminated areas, leading to inconsistent visual perception due to differences in illumination energy per unit area, which affects the overall lighting experience.
Innovation Solution
A light distribution system for freezers featuring an LED strip lamp with a strip-shaped polarizing lens having specific convex and concave surfaces, where the first convex lens exit surface has a larger radius of curvature than the second, and a reflecting surface to direct light uniformly across the illuminated surface, ensuring consistent irradiance from near to far distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a general light source is used to illuminate both near and far surfaces, then the lighting system is simple, but the illumination energy per unit area is uneven between near and far surfaces
Solution Approach 1:
The patent divides the single light source into multiple LED light sources arranged in an array, with each LED equipped with its own lens. This segmentation allows independent control of light distribution for different regions (near and far surfaces), resolving the contradiction between system simplicity and illumination uniformity.
Solution Approach 2:
The patent applies different lens designs to different LEDs based on their position in the array. LEDs closer to the far surface use lenses with different optical parameters than those closer to the near surface, creating local quality variations that achieve overall illumination uniformity across both surfaces.
2Illumination intensity
If multiple light sources of different intensities are used to illuminate near and far areas, then the illumination uniformity improves, but the device complexity increases
Solution Approach 1:
The patent changes optical parameters (lens curvature, aperture, focal length) rather than using multiple light sources of different intensities. Each LED uses a lens with specific parameters tailored to its position, achieving illumination uniformity through parameter optimization rather than through complex multi-source intensity control.
3Use of energy by moving object
If LEDs are used for high light extraction efficiency, then energy efficiency improves, but the light distribution uniformity between near and far surfaces deteriorates
Solution Approach 1:
The patent uses lenses with specific curved surfaces (convex or concave) to redirect light from high-efficiency LEDs. The curvature of the lens surfaces is optimized to distribute light uniformly across both near and far surfaces, resolving the contradiction between maintaining LED efficiency and achieving uniform light distribution.
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 system achieves uniform illumination across the entire surface by enhancing focusing performance through the unique curvature design of the lens surfaces and reflecting surface arrangement, improving the overall lighting experience by maintaining consistent irradiance as the distance transitions from near to far.
Implementation Method 1
a strip-shaped polarizing lens disposed on the lamp holder... the first convex lens exit surface and the second convex lens exit surface are respectively disposed on two sides of the optical axis, a radius of curvature of a contour line of the first convex lens exit surface in a section perpendicular to an extending direction of the LED strip lamp gradually decreases in the direction toward the optical axis
Implementation Method 2
a reflecting surface intersecting the lens setting surface... the reflecting surface receiving the outgoing light of the transition surface and directed it toward the sub-light region
Data Source
AI summary
A light distribution system for freezer that includes a LED strip light disposed on a freezer door. The LED strip lamp includes a lamp holder, a strip-shaped polarizing lens, and a plurality of LED chips. The lamp holder includes a lens setting surface and a reflecting surface. The strip-shaped polarizing lens includes a plurality of optical axis, an incident surface, a first and second convex lens exit surfaces, and a transition surface. An angle between the illuminated surface and the optical axis includes an acute angle and the illuminated surface includes a main light region illuminated by the outgoing light of the first and second convex lens exit surfaces and a sub-light region illuminated by the reflected light from the reflecting surface.