LED lamp including light guide and method of reflecting light using same
First Claim
1. An LED lamp comprising:
- a transparent light pipe enclosed in an envelope, wherein the light pipe has a lower section and an upper section;
an LED in a recess at a lower end of the lower section of the light pipe; and
a reflector formed by an indentation in an upper end of the upper section of the light pipe;
wherein the lower section of the light pipe collects light emitted from the LED, the upper section of the light pipe directs the collected light onto the reflector, and the reflector reflects the directed light in a radial direction, and wherein the lower section of the light pipe is a compound parabolic concentrator, wherein the compound parabolic concentrator collimates the light emitted from the LED, and wherein the upper section of the light pipe is a tapered cylinder that narrows towards the upper end of the light pipe, wherein the tapered cylinder directs the collimated light from the compound parabolic concentrator to the reflector.
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Accused Products
Abstract
An LED lamp including a light guide/light pipe, and a method of reflecting light using same, are disclosed. The LED lamp includes a transparent light pipe enclosed in an envelope, where the light pipe has a lower section and an upper section. The lamp also includes an LED in a recess at a lower end of the lower section, and a reflector formed by an indentation in an upper end of the upper section. The lower section may be a compound parabolic concentrator, and the upper section may be a tapered cylinder. The lower section of the light pipe collects light emitted from the LED, the upper section of the light pipe directs the collected light onto the reflector, and the reflector reflects the directed light in a radial direction.
58 Citations
16 Claims
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1. An LED lamp comprising:
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a transparent light pipe enclosed in an envelope, wherein the light pipe has a lower section and an upper section; an LED in a recess at a lower end of the lower section of the light pipe; and a reflector formed by an indentation in an upper end of the upper section of the light pipe; wherein the lower section of the light pipe collects light emitted from the LED, the upper section of the light pipe directs the collected light onto the reflector, and the reflector reflects the directed light in a radial direction, and wherein the lower section of the light pipe is a compound parabolic concentrator, wherein the compound parabolic concentrator collimates the light emitted from the LED, and wherein the upper section of the light pipe is a tapered cylinder that narrows towards the upper end of the light pipe, wherein the tapered cylinder directs the collimated light from the compound parabolic concentrator to the reflector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A light guide for an LED lamp comprising:
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a compound parabolic concentrator having a lower end and an upper end, wherein the lower end is located nearest to an LED; a tapered cylinder having a wide end and a narrow end, wherein the wide end is coupled to the upper end of the compound parabolic concentrator; and a reflector, wherein the reflector is formed by an indentation at the narrow end of the tapered cylinder; wherein the compound parabolic concentrator and the tapered cylinder use total internal reflection to guide light emitted from the LED to the reflector, and wherein the reflector reflects the guided light in a radial direction. - View Dependent Claims (12, 13, 14, 15)
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16. A method of reflecting light emitted by an LED in a radial direction, the method comprising:
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receiving light emitted from an LED; transmitting the received light to a reflector via total internal reflection through use of a compound parabolic concentrator coupled to a tapered cylinder by collimating the received light within the compound parabolic concentrator and directing the collimated light within the tapered cylinder to the reflector; and reflecting the transmitted light in a radial direction with the reflector, by reflecting, via a reflector defined by an indentation at a narrow end of the tapered cylinder, the transmitted light in a radial direction.
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Specification