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Spherical Light Output LED Lens and Heat Sink Stem System

a technology of led lenses and stems, applied in semiconductor devices, lighting and heating apparatus, instruments, etc., can solve problems such as device failure, reduced light output, and shortening the life of devices

Inactive Publication Date: 2012-09-20
BHAIRI MALEK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This solution enables effective heat management, maintaining light output and extending the life of high-flux LEDs while producing a spherical light pattern, making them suitable for conventional lighting applications.

Problems solved by technology

A build up of heat inside the LED device leads to color shift, reduced light output, shortened life and ultimately device failure.
In addition, drive current, thermal path and ambient temperature also affects the junction temperature.
Furthermore, high-flux LEDs, which are needed for conventional light illumination, require higher drive currents which further increases junction temperature.
Unfortunately, the prior art example contains a critical flaw; it neglects to address LED thermal management; as it does not contain any significant heat sink to draw out the heat via conduction.
Such LED lamps are thus relegated for use with only lower flux LEDs, which would not be suitable for conventional lighting needs.

Method used

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  • Spherical Light Output LED Lens and Heat Sink Stem System
  • Spherical Light Output LED Lens and Heat Sink Stem System
  • Spherical Light Output LED Lens and Heat Sink Stem System

Examples

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Embodiment Construction

[0029]Further features and advantages of the invention, as well as the structure and operation of various embodiments of the invention, are described in detail below with reference to the accompanying FIGS. 2-11.

[0030]FIG. 2 illustrates an example of a spherical light producing lens in accordance with one embodiment of the invention. Light rays A through G emanating from an LED die 201, with a focal point 202, are totally internally reflected then refracted out of the lens 200 by the pointed elements 203 through a 90 degree angle. The top surface of the pointed elements 203 may be coated with a reflective material such as aluminum (AL) or nickel chrome (NiCr). Light rays G through J are refracted out of the double crown lens portion 204 through a 60 degree angle. Collectively, all the light rays emitted by the LED die 201 radiate around a 300 degree lighting angle 205 in the vertical plane and a 360 degree lighting angle in the horizontal plane. Surface 207 may be shaped to direct m...

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PUM

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Abstract

This light emitting diode (LED device provides a 360 degree lighting angle in the horizontal plane and a 300 degree lighting angle in the vertical plane while simultaneously addressing LED die thermal management, which is critical to high lumen output LEDs. This LED lighting device is comprised of the LED lens, the LED holder and the heat sink stem. Light produced by at least one LED die traveling vertically is diffused by the top refractive portion of the lens. Light rays directed towards the pointed elements are totally internally reflected downwards then refracted out of the lens, thus resulting in a spherical light pattern. This technology is designed as a replacement for conventional light sources, such as incandescent light bulbs, halogen bulbs, CFLs (compact fluorescent lamps) and metal halide lamps.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of Invention[0002]This invention relates to light emitting diode (LED) devices and more specifically, to an improved LED lens and heat sink stem for emitting a spherical light pattern and dissipating heat.[0003]2. Description of Related Art[0004]All light sources convert electrical energy into radiant energy and heat in various proportions. Light emitting diode (LED) devices generate little or no IR (infrared) or UV (ultraviolet) light, but convert only 15% to 25% of the electrical power to visible light, the remainder is converted to heat that must be conducted from the LED die to an underlying circuit board, heat sink, etc.[0005]In order to maintain a low junction temperature to keep good performance of an LED, heat generated by the LED must be dissipated. A build up of heat inside the LED device leads to color shift, reduced light output, shortened life and ultimately device failure. In addition, drive current, thermal path and ambient te...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01J7/24
CPCF21V5/04F21K9/50H01L33/58H01L33/62H01L33/642F21V7/0091H01L2224/32245H01L2224/48247H01L2224/73265F21Y2101/02F21K9/135G02B19/0061G02B19/0028G02B19/0071H01L2224/48091H01L2924/00014H01L2924/00F21K9/232F21K9/60F21Y2115/10H01L2924/181H01L2924/00012
Inventor BHAIRI, MALEK
Owner BHAIRI MALEK