Base Distribution Optic for LED Lamp Angular Emission
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Solution Overview
Problem
LED lighting systems with a power supply in the base often obstruct light emission in the direction of the base, failing to achieve uniform luminous intensity distribution in the vertical plane, which is a requirement in some standards for solid-state lighting products.
Innovation Solution
Incorporating a distribution optic in the base of the LED lamp, which can be thermally conductive and transmissive, to direct light angularly from the LEDs, and optionally using a guide optic to direct light into the distribution optic, ensuring that light is emitted in substantially all directions in the vertical plane, mimicking traditional incandescent bulbs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a power supply is included in the base of the LED lamp, then the lamp becomes self-contained, but light emission in the direction of the base is obstructed
Solution Approach 1:
A distribution optic is introduced as an intermediary component between the LED and the base enclosure. This optic redirects light that would otherwise be blocked by the base structure, channeling it through the transmissive base to emit in substantially all directions including downward emission.
Solution Approach 2:
The base enclosure is designed with multi-functionality: it serves as both the housing for the power supply and as a light-transmissive element. By making the base optically transmissive, it simultaneously protects internal components and enables light emission in directions that would normally be blocked by an opaque base.
2Ease of manufacture
If traditional LED lamp structure is used, then manufacturing is simplified, but luminous intensity distribution does not meet standards
Solution Approach 1:
The distribution optic introduces local quality variation into the otherwise simple LED lamp structure. By positioning the optic at specific locations and designing its specific geometry, the system achieves non-uniform light redistribution that meets standardized luminous intensity distribution requirements while maintaining overall structural simplicity.
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 enhances angular emission of light from the base of the LED lamp, meeting standards for luminous intensity distribution and providing a more uniform and pleasing light pattern, especially in vertically oriented lamps replacing elongated incandescent bulbs.
Implementation Method 1
a distribution optic conformably disposed in or on the base to conduct light from the at least one LED for angularly distributed emission from the base of the lamp
Implementation Method 2
a guide optic arranged to direct light from the LED(s) into the distribution optic. The guide optic can be transmissively coupled to the distribution optic to direct the light
Data Source
AI summary
A solid-state lamp with an angular distribution optic is disclosed. Embodiments of the present invention can provide for improved luminous intensity distribution in the vertical plane for a vertically oriented solid-state lamp. A lamp according to some example embodiments of the invention includes at least one LED, an optically transmissive enclosure for the LED or LEDs, and a base. The lamp also includes a distribution optic conformably disposed in or on the base to conduct light for angularly distributed emission from the base of the lamp. In some embodiments, the lamp is dimensioned as a replacement for a candelabra type incandescent bulb. The distribution optic can be composed of any optical medium, and in some embodiments, may be from about 1 mm to about 5 mm thick. In some embodiments, the distribution optic is made of thermally conductive plastic.