Lens for LED light sources
First Claim
1. A lens for LED (light emitting diode) light sources, comprising:
- a lens body defining an inner space therein and the inner space is symmetrical about a center axis of the lens, comprising;
a bottom surface;
an upper reflective surface symmetrical about the center axis of the lens and angled with respect to the center axis;
a side surface extending from an edge of the upper reflective surface to an edge of the bottom surface; and
an inner reflective surface provided on at least a portion of a boundary surface of the inner space, symmetrical about the center axis of the lens and inclined at a predetermined angle, so that light entering the lens from an LED light source through the bottom surface is reflected by the upper reflective surface or the inner reflective surface and exits the lens through the side surface in a direction substantially perpendicular to the center axis of the lens.
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Accused Products
Abstract
A lens for light emitting diode (LED) light sources which allows light emitted from an LED light source to exit the lens in a direction perpendicular to a vertical center axis of the lens. The lens of the present invention includes an inner space which is defined in a lens body having both a bottom surface and an upper reflective surface, so that light passing through the inner space is partially reflected by total internal reflection on a portion (selective transmission surface, inner reflective surface, inside reflective surface) of a boundary surface between the inner space and the lens body. Thus, light emitted from an LED light source efficiently exits the lens through a side surface. Accordingly, the lens of the present invention is used in efficient display and illumination optical systems.
172 Citations
17 Claims
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1. A lens for LED (light emitting diode) light sources, comprising:
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a lens body defining an inner space therein and the inner space is symmetrical about a center axis of the lens, comprising; a bottom surface; an upper reflective surface symmetrical about the center axis of the lens and angled with respect to the center axis; a side surface extending from an edge of the upper reflective surface to an edge of the bottom surface; and an inner reflective surface provided on at least a portion of a boundary surface of the inner space, symmetrical about the center axis of the lens and inclined at a predetermined angle, so that light entering the lens from an LED light source through the bottom surface is reflected by the upper reflective surface or the inner reflective surface and exits the lens through the side surface in a direction substantially perpendicular to the center axis of the lens. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A lens for LED (light emitting diode) light sources, comprising:
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a lower lens unit having a bottom surface coupled to an LED light source; and an upper lens unit coupled to the lower lens unit, comprising an upper reflective surface symmetrical about a center axis of the lens and angled with respect to the center axis, wherein the upper lens unit and the lower lens unit are coupled to define between them an inner space symmetrical about the center axis of the lens, and at least a portion of an upper surface of the lower lens unit in contact with the inner space, forms an inner reflective surface symmetrical about the center axis of the lens and inclined at a predetermined angle, so that light entering the lens from the LED light source through the bottom surface is reflected by the upper reflective surface and exits the lens through the upper lens unit in a direction substantially perpendicular to the center axis of the lens, and light entering the lens from the LED light source through the bottom surface is reflected by the inner reflective surface and exits the lens through the lower lens unit in a direction substantially perpendicular to the center axis of the lens. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A lens for LED (light emitting diode) light sources, comprising:
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a lower lens unit having a bottom surface coupled to an LED light source; an upper lens unit coupled to the lower lens unit, comprising an upper reflective surface symmetrical about a center axis of the lens and angled with respect to the center axis, wherein the upper lens unit and the lower lens unit are coupled to define between them an inner space having a ring shape; and an inside reflective surface provided on an inside boundary surface of the inner space, so that part of light entering the lens from the LED light source through the bottom surface is reflected by the inside reflective surface and exits the lens in a direction substantially perpendicular to the center axis of the lens. - View Dependent Claims (17)
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Specification