Synchronized light board and heat sink rotation for illumination beam redirection

Patent metadata

Field	Value
Publication number	US-12553590-B1
Application number	US-202519192904-A
Country	US
Kind code	B1
Filing date	Apr 29, 2025
Priority date	Apr 29, 2025
Publication date	Feb 17, 2026
Grant date	Feb 17, 2026

Abstract

Illustrative embodiments of a light fixture are disclosed that feature a housing and an internal optical module. The optical module includes one or more light emitter assemblies that are rotationally adjustable and a fixed primary heat sink. Each light emitter assembly includes a light emitter member, an intermediate rotatable heat sink, and an optional optic. The primary heat sink within the housing provides thermally conductive surfaces that maintain contact with the intermediate heat sinks throughout their range of rotation with the light emitter members. A synchronization mechanism ensures coordinated rotation of the light emitter assemblies. The fixture may also include a lens that encloses the optical module within the housing and an actuator for adjusting the rotation of the light emitters from outside the housing. The design allows for efficient thermal management and adjustable light beam direction with no change in position of the external housing or the mounting structure.

First claim

What is claimed is:

1 . A light fixture, comprising:
a housing; at least two light emitter assemblies rotationally coupled to the housing, each of the at least two light emitter assemblies comprising a light emitter member and a rotatable heat sink; a fixed heat sink coupled within the housing, the fixed heat sink defining at least two thermally conductive surfaces shaped to remain in continual contact with respective ones of the rotatable heat sinks upon rotation of the at least two light emitter assemblies; and a synchronization mechanism coupled to each of the at least two light emitter assemblies to synchronize rotation of the at least two light emitter assemblies.

2 . The light fixture of claim 1 , wherein each of the at least two light emitter assemblies further comprises an optic.

3 . The light fixture of claim 1 , wherein each of the rotatable heat sinks is thermally coupled to a back side of a respective one of the light emitter members and defines a semicylindrical thermally conductive surface for contacting and thermal coupling with a respective one of the at least two thermally conductive surfaces of the fixed heat sink.

4 . The light fixture of claim 1 , wherein the synchronization mechanism includes a linkage rotationally coupling the at least two light emitter assemblies.

5 . The light fixture of claim 4 , wherein:
the synchronization mechanism includes a hub coupled to an end of each of the at least two light emitter assemblies; and the linkage is rigid and rotationally couples the hubs.

6 . The light fixture of claim 5 , wherein the linkage couples to each of the hubs at a different radius from a center of the hubs, thereby providing a different rate of rotation for each of the at least two light emitter assemblies.

7 . The light fixture of claim 5 , wherein the linkage couples to each of the hubs on opposite halves of the hubs, thereby providing a different direction of rotation for each of the at least two light emitter assemblies.

8 . The light fixture of claim 1 , further comprising an optical module comprising the at least two light emitter assemblies, the fixed heat sink, and the synchronization mechanism.

9 . The light fixture of claim 8 , further comprising:
a lens; and an actuator coupled to the synchronization mechanism, accessible from an exterior of the housing, and enabling rotation of the at least two light emitter assemblies; wherein the housing and the lens enclose the optical module.

10 . The light fixture of claim 1 , wherein each of the rotatable heat sinks defines a half-cylinder.

11 . A light fixture, comprising:
a housing; a first light emitter member rotationally coupled to the housing; a first intermediate heat sink defining a first semicylindrical heat transfer surface, the first intermediate heat sink fixedly and thermally coupled to the first light emitter member; a primary heat sink fixedly coupled to the housing and defining a second semicylindrical heat transfer surface for contacting and thermally coupling with the first semicylindrical heat transfer surface of the first intermediate heat sink; and an actuator coupled to the first light emitter member enabling rotation of the first light emitter member to alter a light beam emitter from the housing; wherein the first intermediate heat sink remains in contact with and thermally coupled to the primary heat sink upon rotation of the first light emitter member.

12 . The light fixture of claim 11 , further comprising an optical module comprising the first light emitter member, the first intermediate heat sink, and the primary heat sink.

13 . The light fixture of claim 12 , further comprising a lens and wherein the housing and the lens enclose the optical module.

14 . The light fixture of claim 12 , wherein the actuator is configured with the housing such that the actuator is accessible from outside the housing to enable changing a rotation position of the first light emitter member.

15 . The light fixture of claim 11 , further comprising:
a second light emitter member rotationally coupled to the housing; and a second intermediate heat sink defining a third semicylindrical heat transfer surface, the second intermediate heat sink fixedly and thermally coupled to the second light emitter member; wherein the primary heat sink further defines a fourth semicylindrical heat transfer surface for contacting and thermally coupling with the third semicylindrical heat transfer surface of the second intermediate heat sink.

16 . The light fixture of claim 15 , further comprising a synchronization mechanism including a linkage rotationally coupling the first and the second light emitter members.

17 . The light fixture of claim 16 , wherein:
the synchronization mechanism includes a first and a second hub; the first hub is mounted to an end of at least one of the first light emitter member and the first intermediate heat sink; the second hub is mounted to an end of at least one of the second light emitter member and the second intermediate heat sink; and the linkage is rigid and is attached to the first and second hubs.

18 . The light fixture of claim 17 , wherein the linkage is attached to the first and second hubs at different radii from a center of the first and second hubs, thereby providing a different rate of rotation for each of the first and second light emitter members.

19 . The light fixture of claim 17 , wherein the linkage is attached to each of the first and second hubs on opposite halves of the first and second hubs, thereby providing a different direction of rotation for each of the first and second light emitter members.

20 . The light fixture of claim 15 , wherein the first and second intermediate heat sinks remain in contact with and thermally coupled to the primary heat sink throughout a range of rotation of the first and second light emitter members of at least 40 degrees.

21 . The light fixture of claim 11 , further comprising:
a first plurality of light emitters mounted to the first light emitter member; wherein:
the first semicylindrical heat transfer surface spans a full length of the first plurality of light emitters; and
the second semicylindrical heat transfer surface spans a full length of the first semicylindrical heat transfer surface.

22 . A light fixture, comprising:
a housing; and an optical module coupled to the housing and including:
a first light emitter member rotationally coupled to the optical module;
a first intermediate heat sink defining a first semicylindrical heat transfer surface, the first intermediate heat sink fixedly and thermally coupled to the first light emitter member;
a second light emitter member rotationally coupled to the optical module;
second intermediate heat sink defining a second semicylindrical heat transfer surface, the second intermediate heat sink fixedly and thermally coupled to the second light emitter member;
a primary heat sink fixedly coupled to the housing and defining a third and a fourth semicylindrical heat transfer surface for respectively contacting and thermally coupling the first and second semicylindrical heat transfer surfaces of the first and second intermediate heat sinks;
a first hub defined at an end of at least one of the first light emitter member and the first intermediate heat sink;
a second hub defined at an end of at least one of the second light emitter member and the second intermediate heat sink;
a linkage rotational

Assignees

• Rab Lighting Inc

Inventors

• Ying Zhangyong
• Hu Jiang
• Lui Hongjun
• Osborne Stephen

Classifications

• F21V29/763

  the planes containing the fins or blades having the direction of the light emitting axis · CPC title

• F21V29/70

  characterised by passive heat-dissipating elements, e.g. heat-sinks · CPC title

• F21V29/76

  with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section · CPC title

• F21V15/01

  Housings, e.g. material or assembling of housing parts (F21V15/02 takes precedence {housings forming signs or letters G09F13/04}) · CPC title

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title