Light Diffusion Lens for LED Irradiation Angle Expansion
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Solution Overview
Problem
LED-based lighting fixtures have a limited irradiation angle due to directional light emission, differing significantly from traditional incandescent bulbs, which affects optical distribution and marketability.
Innovation Solution
A light diffusion lens with a center hole and a depressed light incident unit surrounding it, designed to refract light emitted from LEDs, increasing the irradiation angle by bending light at specific angles and diffusing it outward.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If LED-based lighting fixtures are used, then energy efficiency is improved, but irradiation angle is limited
Solution Approach 1:
A light diffusion lens is introduced as an intermediary component between the LED optical source and the surrounding environment. The lens includes a light incident unit with a specific curved surface that receives light from the LED and redirects it at multiple angles, effectively mediating the transformation from directional LED emission to omnidirectional light distribution similar to traditional bulbs
Solution Approach 2:
The patent changes the optical parameters by designing a light incident unit with a specific curved surface geometry. This curved surface is configured to receive light at certain angles and emit it at different angles, fundamentally altering the light distribution pattern from the inherent directional LED pattern to a 360-degree omnidirectional pattern
2Use of energy by moving object
If directional light emission is used, then LED efficiency is improved, but light distribution uniformity deteriorates
Solution Approach 1:
The light diffusion lens acts as a mediator that preserves the efficiency benefits of directional LED emission while transforming the light distribution pattern. The lens receives the directional light from the LED and redistributes it uniformly in all directions, achieving both LED efficiency and uniform light distribution
3Ease of manufacture
If conventional LED lens structure is used, then manufacturing simplicity is maintained, but irradiation angle expansion is limited
Solution Approach 1:
The patent employs a curved surface in the light incident unit, specifically designed with spherical or spheroidal geometry. This curvature enables the lens to receive light from the directional LED and redirect it at multiple angles, expanding the irradiation angle to 360 degrees while maintaining compatibility with conventional LED mounting structures
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 light diffusion lens significantly increases the irradiation angle of LED lighting fixtures to 310 degrees, aligning with the broader light distribution of incandescent bulbs, enhancing visibility and marketability.
Implementation Method 1
a light diffusion lens disposed on upper surfaces of the plurality of optical sources to refract light emitted from the plurality of optical sources and to increase an irradiation angle of light
Data Source
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AI summary
A lighting fixture includes: a base (110); a plurality of optical sources (112) attached on an upper surface of the base to emit light; a heat spreader (120) attached to the base to radiate heat emitted from the plurality of optical sources; and a light diffusion lens (130) disposed on the upper surface of the plurality of optical sources to refract light emitted from the plurality of optical sources and to increase an irradiation angle of light. In the lighting fixture, an irradiation angle of light emitted from an optical source is close to that of a general electric-light bulb and thus a light distribution characteristic of the lighting fixture may be improved.