CN-122003631-A - Optical system for lighting device

Abstract

An optical system may include an emitter assembly and an optical structure configured for use with a lighting device to provide a narrow beam angle of the lighting device. The emitter assembly may include an emitter array configured to emit light. The optical structure may include a body having a light inlet portion, a light outlet portion, and a sidewall extending between the light inlet portion and the light outlet portion. The sidewalls of the optical structure may define a Total Internal Reflection (TIR) surface. The light outlet portion may include a front surface and an octagonal-shaped well formed in the front surface. The octagonal shaped well may have a central surface surrounded by a beveled portion configured to refract light reflected from the TIR surface toward the central axis of the optical system such that light rays transmitted from the light exit portion are substantially collimated.

Inventors

• DONG FANGXU
• D.J.Lu

Assignees

• 路创技术有限责任公司

Dates

Publication Date

20260508

Application Date

20240906

Priority Date

20230906

Claims (20)

1. 1. An optical system, comprising: an emitter assembly including an emitter array configured to emit light, the emitter array characterized by a region centered about a central axis of the optical system, and An optical structure comprising a body having a light inlet portion configured to receive the light emitted by the emitter, a light outlet portion, and a sidewall extending between the light inlet portion and the light outlet portion, the body centered about the central axis of the optical system, the sidewall defining a Total Internal Reflection (TIR) surface within the body of the optical structure, the TIR surface configured to reflect light emitted by the emitter assembly toward the light outlet portion; Wherein the light exit portion comprises a front surface and an octagonal shaped well formed in the front surface, the octagonal shaped well comprising a central surface surrounded by a beveled portion configured to refract light reflected from the TIR surface towards the central axis of the optical system such that light rays transmitted from the light exit portion are substantially collimated.
2. 2. The optical system of claim 1, wherein the octagonal-shaped well defines an opening in the front surface of the light exit portion, the opening having four long sides and four short sides that alternate such that each of the short sides is connected between two of the long sides.
3. 3. The optical system of claim 2, wherein each of the long sides is straight and parallel to a respective side of the array of the emitters.
4. 4. The optical system of claim 3, wherein each of the short sides bisects a corner of a square formed by the long sides.
5. 5. The optical system of claim 4, wherein each of the short sides is straight.
6. 6. The optical system of claim 4, wherein each of the short sides is curved.
7. 7. The optical system of claim 2, wherein the octagonal-shaped well comprises a sidewall extending between the front surface of the light exit portion and the beveled portion of the octagonal well.
8. 8. The optical system of claim 7, wherein the sidewall is perpendicular to the front surface of the light exit portion such that the sidewall is aligned with the long side and the short side of the opening defined by the octagonal-shaped well.
9. 9. The optical system of claim 7, wherein the sidewall is configured to offset the beveled portion from the front surface of the light exit portion to position the beveled portion to reflect light reflected from the TIR surface toward the central axis of the optical system such that light rays transmitted from the light exit portion are substantially collimated.
10. 10. The optical system of claim 1, wherein the beveled portion of the octagonal-shaped well is flat and oriented at an angle relative to the central axis.
11. 11. The optical system of claim 10, wherein both the front surface of the light exit portion and the central surface of the octagonal-shaped well are planar.
12. 12. The optical system of claim 1, wherein the emitter array of the emitter assembly is mounted to a substrate.
13. 13. The optical system of claim 12, wherein the emitter assembly comprises: An optical element mounted over the emitter array for conducting light emitted by the emitter array, the optical element defining a circular perimeter surrounding the area of the emitter array, the optical element comprising: a first circular portion centered about the central axis of the optical system and having a dome shape for increasing an amount of light transmitted by the emitter array transmitted from the optical element within the first portion, and A second circular portion positioned around the first circular portion and extending toward the substrate on which the emitter array is mounted, the second circular portion having a substantially flat or convex shape and being configured to spread light transmitted from the optical element within the second circular portion away from the central axis of the optical system to reduce an apparent size of the area of the emitter array of the emitter assembly.
14. 14. The optical system of claim 1, wherein the TIR surface comprises a first TIR surface and the light inlet portion of the optical structure defines a recess in the body of the optical structure and defines a protrusion extending from the body into the recess, the protrusion comprising a sidewall defining a second TIR surface within the body of the optical structure, the second TIR surface configured to reflect light emitted by the emitter array toward the light outlet portion.
15. 15. The optical system of claim 1, wherein the emitter array is characterized by a square-shaped area.
16. 16. An optical system, comprising: an emitter assembly including an emitter array configured to emit light, the emitter array characterized by a region centered about a central axis of the optical system, and An optical structure comprising a body having a light inlet portion configured to receive the light emitted by the emitter, a light outlet portion, and a sidewall extending between the light inlet portion and the light outlet portion, the body centered about the central axis of the optical system, the sidewall defining a Total Internal Reflection (TIR) surface within the body of the optical structure, the TIR surface configured to reflect light emitted by the emitter assembly toward the light outlet portion; Wherein the light exit portion comprises a front surface and a well formed in the front surface, the well comprising a central surface surrounded by a beveled portion configured to refract light reflected from the TIR surface towards the central axis of the optical system such that light rays transmitted from the light exit portion are substantially collimated.
17. 17. An optical system, comprising: An emitter configured to emit light, and An optical structure comprising a body having a light inlet portion configured to receive the light emitted by the emitter, a light outlet portion, and a sidewall extending between the light inlet portion and the light outlet portion, the sidewall defining a first Total Internal Reflection (TIR) surface within the body of the optical structure, the first TIR surface configured to reflect light emitted by the emitter toward the light outlet portion; wherein the light inlet portion of the optical structure defines a recess in the body of the optical structure and defines a protrusion extending from the body into the recess, the protrusion comprising a sidewall defining a second TIR surface within the body of the optical structure, the second TIR surface configured to reflect light emitted by the emitter towards the light outlet portion.
18. 18. The optical system of claim 17, wherein the emitter is mounted to a substrate.
19. 19. The optical system of claim 18, further comprising an emitter assembly comprising the emitter, wherein the emitter comprises an emitter array mounted to the substrate, and the emitter assembly comprises: An optical element mounted over the emitter array for conducting light emitted by the emitter array, the optical element defining a circular perimeter surrounding an area of the emitter array, the optical element comprising: A first circular portion centered on a central axis of the optical system and having a dome shape for increasing an amount of light transmitted by the emitter array transmitted from the optical element within the first portion, and A second circular portion positioned around the first circular portion and extending toward the substrate on which the emitter array is mounted, the second circular portion having a substantially flat or convex shape and being configured to spread light transmitted from the optical element within the second circular portion away from the central axis of the optical system to reduce an apparent size of the area of the emitter array of the emitter assembly.
20. 20. The optical system of claim 17, wherein the light exit portion comprises a front surface and an octagonal-shaped well formed in the front surface, the octagonal-shaped well comprising a central surface surrounded by a beveled portion configured to refract light reflected from the first TIR surface toward a central axis of the optical system such that light rays transmitted from the light exit portion are substantially collimated.

Description

Optical system for lighting device Cross Reference to Related Applications The present application claims the benefit of provisional U.S. patent application Ser. No. 63/580,856, filed on 6 at 9 at 2023, the entire disclosure of which is hereby incorporated by reference in its entirety. Background Lamps and displays that use efficient light sources, such as Light Emitting Diode (LED) light sources, for illumination are becoming increasingly popular in many different markets. LED light sources offer a number of advantages over conventional light sources such as incandescent and fluorescent lamps. For example, LED light sources may have lower power consumption and longer lifetime than conventional light sources. In addition, LED light sources may not have harmful substances and may provide additional specific advantages for different applications. When used for general lighting, LED light sources provide opportunities to adjust the color (e.g., from white to blue, green, etc.) or color temperature (e.g., from warm white to cool white) of the light emitted from the LED light sources to produce different lighting effects. Disclosure of Invention As described herein, an optical system may include an emitter assembly and an optical structure configured for use with a lighting device to provide a narrow beam angle of the lighting device. The emitter assembly may include an emitter array configured to emit light, wherein the emitter array may be characterized by a region that may be centered about a central axis of the optical system. The optical structure may include a body having a light inlet portion configured to receive light emitted by the emitter, a light outlet portion, and a sidewall extending between the light inlet portion and the light outlet portion. The body of the optical structure may be centered about a central axis of the optical system. The side wall of the optical structure may define a first Total Internal Reflection (TIR) surface within the body of the optical structure, wherein the first TIR surface may be configured to reflect light emitted by the emitter towards the light outlet portion. The light inlet portion of the optical structure may define a recess in the body of the optical structure and define a protrusion extending from the body into the recess. The protrusion may include a sidewall defining a second TIR surface within the body of the optical structure, the second TIR surface configured to reflect light emitted by the emitter assembly toward the light exit portion (e.g., to provide a narrow beam angle of the illumination device). In addition, the light outlet portion may include a front surface and an octagonal-shaped well formed in the front surface. The octagonal shaped well may include a central surface surrounded by a beveled portion configured to refract light reflected from the first TIR surface toward a central axis of the optical system such that light rays transmitted from the light exit portion are substantially collimated. In some examples, the octagonal-shaped well defines an opening in a front surface of the light exit portion. The opening may have four long sides and four short sides that alternate such that each of the short sides is connected between two of the long sides. For example, each of the long sides may be straight and parallel to a respective side of the array of emitters. In some examples, each of the short sides bisects a corner of the square formed by the long sides. Each of the short sides may be straight or curved. The octagonal shaped well may comprise a side wall extending between the front surface of the light outlet portion and the beveled portion of the octagonal well. The side wall may be perpendicular to the front surface of the light outlet portion such that the side wall is aligned with the long and short sides of the opening defined by the octagonal-shaped well. The sidewall may be configured to offset the beveled portion from the front surface of the light-exit portion to position the beveled portion to reflect light reflected from the TIR surface toward the central axis of the optical system such that light rays transmitted from the light-exit portion are substantially collimated. The beveled portion of the octagonal-shaped well may be flat and oriented at an angle relative to the central axis. For example, both the front surface of the light exit portion and the central surface of the octagonal-shaped well are flat. In some examples, the emitter array of the emitter assembly is mounted to the substrate. Further, the emitter assembly may include an optical element (e.g., dome) mounted over the emitter array for conducting light emitted by the emitters. The optical element may define a circular perimeter surrounding an area of the emitter array. The optical element may include a first circular portion centered about a central axis of the optical system and having a dome shape for increasing an amount of light transmitted from the optical el