LED-based MR16 replacement lamp
First Claim
1. A lamp comprising:
- a housing providing an external electrical connection, wherein the housing incorporates a heat-dissipating structure, wherein the housing has an outer shape conforming to a form factor of an MR16 lamp;
a single emitter structure disposed within the housing, the single emitter structure having;
a substrate having a recess;
a plurality of light-emitting diodes (LEDs) arranged within the recess, wherein each LED is a separate semiconductor die mounted on the substrate, wherein different ones of the plurality of LEDs produce light of different colors, and wherein the plurality of LEDs includes at least one LED that produces a warm white light, at least one LED that produces a cool white light, and at least one LED that produces a red light;
wherein the substrate includes electrical connection traces such that the LEDs are connected to form a plurality of independently addressable groups; and
a primary lens disposed over the recess;
a total-internal-reflection (TIR) lens positioned to collect light emitted from the single emitter structure and adapted to mix the light from the plurality of LEDs to produce a uniform white light, wherein the TIR lens has;
a concave front surface having a plurality of hexagonal convex microlenses thereon; and
a central cavity extending along the optical axis from a rear surface to a point more than halfway to the concave front surface, wherein the primary lens of the single emitter structure extends partway into the central cavity;
a diffusive coating applied to a front face of the TIR lens; and
a control circuit disposed within the housing and configured to supply different amounts of power to different ones of the independently addressable groups of the LEDs to provide a tunable color of light.
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Accused Products
Abstract
An LED-based lamp can be made to have a form factor compatible with fixtures designed for MR16 lamps. Such a lamp can have a housing that provides an external electrical connection. Inside the housing is disposed a single emitter structure having a substrate with multiple light-emitting diodes (LEDs) arranged thereon. Different LEDs produce light of different colors (or color temperatures). For example, at least one LED can produce a warm white light, while at least one other LED produces a cool white light and at least one other LED produces a red light. A total-internal-reflection (TIR) lens is positioned to collect light emitted from the single emitter structure and adapted to mix the light from the LEDs to produce a uniform white light. A diffusive coating is applied to a front face of the TIR lens for further color mixing.
108 Citations
12 Claims
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1. A lamp comprising:
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a housing providing an external electrical connection, wherein the housing incorporates a heat-dissipating structure, wherein the housing has an outer shape conforming to a form factor of an MR16 lamp; a single emitter structure disposed within the housing, the single emitter structure having; a substrate having a recess; a plurality of light-emitting diodes (LEDs) arranged within the recess, wherein each LED is a separate semiconductor die mounted on the substrate, wherein different ones of the plurality of LEDs produce light of different colors, and wherein the plurality of LEDs includes at least one LED that produces a warm white light, at least one LED that produces a cool white light, and at least one LED that produces a red light; wherein the substrate includes electrical connection traces such that the LEDs are connected to form a plurality of independently addressable groups; and a primary lens disposed over the recess; a total-internal-reflection (TIR) lens positioned to collect light emitted from the single emitter structure and adapted to mix the light from the plurality of LEDs to produce a uniform white light, wherein the TIR lens has; a concave front surface having a plurality of hexagonal convex microlenses thereon; and a central cavity extending along the optical axis from a rear surface to a point more than halfway to the concave front surface, wherein the primary lens of the single emitter structure extends partway into the central cavity; a diffusive coating applied to a front face of the TIR lens; and a control circuit disposed within the housing and configured to supply different amounts of power to different ones of the independently addressable groups of the LEDs to provide a tunable color of light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification