Lens and LED using the lens to achieve homogeneous illumination
AssigneeIndustrial Technology Research Institute
InventorsTien-Fu Huang, Che-Wei Su, Kuo-Chang Hu
Life of this patent
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Abstract
A lens and an LED using the lens to achieve homogeneous illumination include a region. The region around the optical axis of a lens is designed to be concave and form a divergent surface. The upper surface of the lens is a continuous curved surface to diverge the high-intensity light emitted by the LED in the vicinity of the optical axis through refractions. Therefore, the LED can homogeneously illuminate a larger area.
Claims23
A lens having a circularly symmetric structure and a continuous action surface with a concave part in the middle of its surface, defined as a divergent surface, and a convergent surface around the divergent surface, wherein the thickness of the divergent surface increases outwards whereas the thickness of the convergent surface decreases outwards.
A light-emitting diode (LED) that emits homogeneous light, comprising:
- an LED chip, which has an optical axis;
- and
- a lens, which has a circularly symmetric structure and covers the LED chip and whose action surface is a continuous curved surface, wherein the action surface in the vicinity of the optical axis has a concave part, defined as a divergent surface, and the divergent surface is surrounded by a convergent surface, the thickness of the divergent surface increases outwards and the thickness of the convergent surface decreases outwards, so that the light emitted from the LED chip is deflected away from the optical axis as it goes through the divergent surface and is deflected toward the optical axis as it goes through the convergent surface.
A light-emitting diode (LED) that emits homogeneous light, comprising:
- a substrate;
- an LED chip, which is installed on the substrate and has an optical axis;
- and
- a lens, whose bottom has a concave part to cover the LED chip when the lens is connected to the substrate and whose action surface is a continuous curved surface, wherein the action surface in the vicinity of the optical axis has a concave part, defined as a divergent surface, and the divergent surface is surrounded by a convergent surface, the thickness of the divergent surface increases outwards and the thickness of the convergent surface decreases outwards, so that the light emitted from the LED chip is deflected away from the optical axis as it goes through the divergent surface and is deflected toward the optical axis as it goes through the convergent surface.
A light-emitting diode (LED) that emits homogeneous light, comprising:
- an LED module, which has an optical axis;
- and
- a lens, whose bottom has a concave part to combine with the top part of the LED module and whose action surface is a continuous curved surface, wherein the action surface in the vicinity of the optical axis has a concave part, defined as a divergent surface, and the divergent surface is surrounded by a convergent surface, the thickness of the divergent surface increases outwards and the thickness of the convergent surface decreases outwards, so that the light emitted from the LED chip is deflected away from the optical axis as it goes through the divergent surface and is deflected toward the optical axis as it goes through the convergent surface.
A light-emitting diode (LED) that emits homogeneous light, comprising:
- a substrate;
- an LED chip, which is installed on the substrate and has an optical axis;
- and
- a lens, which is formed on the substrate to cover the LED chip and whose surface is in the form of a Fresnel lens;
- wherein the action surface of the lens in the vicinity of the optical axis has a concave part, defined as a divergent surface, and the divergent surface is surrounded by a convergent surface, the thickness of the divergent surface increases outwards and the thickness of the convergent surface decreases outwards, so that the light emitted from the LED chip is deflected away from the optical axis as it goes through the divergent surface and is deflected toward the optical axis as it goes through the convergent surface.
Dependencies are inferred from the claim text.