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US 11,137,665 B2Granted
Uniform, efficient, and color tunable ring flash for camera using LEDs with light emission from multiple sides
AssigneeLumileds LLC
InventorsVarun Dev Kakkar, Arjen Van Der Sijde, Erno Fancsali, Chunxia Feng, Nicola Pfeffer
Life of this patent
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Abstract
A device includes a light-emitting device (LED) having at least two vertical light-emitting sides, and a ring-shaped light guide having a bottom side, a top side comprising a light-emitting surface, an inner sidewall, and an outer sidewall defining an indentation having at least two vertical in-coupling surfaces mated to the at least two vertical light-emitting sides of the LED.
Claims21
A light guide module, comprising:
- a light guide configured to guide light in a ring as guided light, the ring defining a plane,
- the light guide including a light-emitting surface that is generally planar, substantially parallel to the plane, and configured to emit at least a portion of the guided light,
- the light guide further including a first light-accepting surface that is generally planar and positioned generally orthogonal to the light-emitting surface,
- the light guide further including a second light-accepting surface that is generally planar and positioned generally orthogonal to the light-emitting surface, the second light-accepting surface being adjacent to the first light-accepting surface and angled with respect to the first light-accepting surface;
- and
- a light-emitting diode configured to illuminate the light guide,
- the light-emitting diode having a first light-producing surface that is generally planar and positioned to face the first light-accepting surface of the light guide,
- the light-emitting diode having a second light-producing surface that is generally planar and positioned to face the second light-accepting surface of the light guide.
5 more elements
A method for producing a light guide module, the method comprising:
- forming a light guide,
- the light guide configured to guide light in a ring as guided light,
- the ring defining a plane,
- the light guide including a light-emitting surface that is generally planar, substantially parallel to the plane, and configured to emit at least a portion of the guided light,
- the light guide further including a first light-accepting surface that is generally planar and positioned generally orthogonal to the light-emitting surface,
- the light guide further including a second light-accepting surface that is generally planar and positioned generally orthogonal to the light-emitting surface, the second light-accepting surface being adjacent to the first light-accepting surface and angled with respect to the first light-accepting surface.
3 more elements
Dependencies are inferred from the claim text.