A closed-loop optical architecture for suppressing stray light at the source of a light source

Abstract

This invention discloses a closed-loop optical architecture for suppressing stray light at the source of a light source, relating to the field of lighting optics design technology. The invention includes a light-emitting source and a mounting substrate, with an enclosing structure matched to the outer periphery near the light source. A continuous light-absorbing surface is formed on the inner side of the enclosing structure, corresponding to the lateral stray light overflow path of the light source, used to constrain lateral diffuse light and stray light overflow. A forward light-emitting opening is reserved at the top of the enclosing structure to avoid obstruction of the main axial light path of the light source and maintain the integrity of the forward light-emitting path. The enclosing structure adopts a double-layer composite structure, realizing lateral light absorption and structural shaping functions respectively, and can adapt to various light source arrangements such as point light sources, linear strip light sources, and multi-light source combination modules. This invention, through the bottom-layer optical path structure design of near-end enclosing light control, achieves source suppression of stray light and glare without attenuating forward light emission.

Description

Technical Field

[0001] This invention belongs to the field of LED lighting optical structure technology, specifically relating to a closed-loop stray light suppression optical architecture at the source of a light source, which is applicable to glare optimization and optical path control of various SMD and COB LED light sources. Background Technology

[0002] When LED lighting is working, in addition to the effective light emitted in the forward direction, the light source will simultaneously generate circumferential and lateral scattered stray light and diffuse reflection residual light. This stray light will be reflected and superimposed multiple times by the inner cavity of the lamp and the ambient surface, which will directly increase the UGR glare value of the lamp.

[0003] Existing conventional light control solutions mostly employ structures such as far-end reflectors, external lenses, large-area grids, and simple light-blocking sheets, which have significant shortcomings: the light control components are too far from the light source, making it impossible to block lateral stray light at close range at the source; the light-blocking structures are mostly non-closed-loop designs, resulting in stray light overflow blind zones; some light-blocking and light-controlling structures encroach on the main light output path, causing positive illuminance loss; conventional structures have limited functionality and cannot simultaneously address stray light absorption and residual light recovery. To address these shortcomings of existing technologies, this paper proposes a closed-loop stray light suppression optical architecture at the light source. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies such as lagging stray light control, inability to balance light control and light output efficiency, weak structural barriers, and susceptibility to circumvention, this paper provides an LED light source stray light suppression optical structure that achieves the technical effects of source-level stray light control, low glare, no positive light loss, strong adaptability, and strong anti-circumvention capability.

[0005] A closed-loop stray light suppression optical architecture for a light source includes an enclosing structure. The enclosing structure is positioned close to the outer periphery of the LED light source, corresponding to the lateral light-emitting area of ​​the LED light source. A continuous closed-loop circumferential light-absorbing surface is formed on the inner side of the enclosing structure, completely surrounding the side of the light source. The enclosing structure only constrains and absorbs lateral light from the light source, avoiding interference with the main light-emitting direction along the light source axis, effectively preventing interference with the main light-emitting path and ensuring normal light output performance.

[0006] The enclosed structure is a hollow, one-piece molded structure with a through-light path channel inside, which is coaxially arranged with the LED light source.

[0007] The enclosed structure is a double-layer composite functional layer structure or a single-layer matte light-absorbing structure. The inner layer is a matte light-absorbing layer that forms the circumferential light-absorbing surface, and the outer layer is a high-brightness reflective layer. The inner layer only absorbs the lateral diffuse stray light from the light source, and the outer layer only regularly recovers the residual reflected light from the cavity. The two layers are functionally independent and do not overlap.

[0008] The circumferential light-absorbing surface can be any one of the following continuous closed-loop extinction structures: matte frosted surface, annular light-absorbing groove, or honeycomb light-absorbing texture.

[0009] The optical path channel has a uniform, slightly tapered structure that is wider at the bottom and narrower at the top along the axial direction. The inner diameter of the light source end is larger than that of the light-emitting end, forming a fixed-proportion progressive constraint cavity that limits the diffusion angle of lateral spill light. The overall height of the enclosed structure is slightly greater than the height of the light source body, and the light-emitting port at the top does not exceed the extension range of the main light-emitting surface of the light source, forming a close-fitting limiting structure at the near end.

[0010] The matte light-absorbing layer is made of optical black PC, matte acrylic, and matte nylon; the high-gloss reflective layer is made of optical white PC and white acrylic.

[0011] The bottom of the enclosing structure is provided with a positioning assembly part, which is a ring boss, a snap-fit ​​structure or an adhesive bonding surface, and is adapted to be closely fitted to the light source substrate.

[0012] The overall structure is compatible with various LED light sources, including SMD discrete light sources, COB surface light sources, panel lights, classroom lights, and purification light modules.

[0013] The double-layer structure is made by two-color one-piece injection molding, with tight bonding between the layers without gaps or relative displacement, resulting in strong structural stability.

[0014] This structure is widely compatible with all types of low-glare lighting fixtures, including LED panel lights, classroom eye-protection lights, integrated purification lights, commercial lighting, recessed spotlights, and track spotlights. Beneficial effects

[0015] Near-end light control at the source, closed-loop circumferential light-absorbing surface absorbs lateral stray light without dead angles, significantly reducing UGR glare value; Strict isolation of lateral stray light control from the main forward light path, with absolutely no forward illuminance loss; The dual-layer functional decoupling design separates light absorption and light reflection recovery, resulting in better optical efficiency. The micro-retracted oral cavity with proximal height limitation and rigid geometric locking significantly increases the threshold for avoidance. The integrated, dual-color injection molding process is mature, mass production costs are controllable, and it is compatible with all types of lighting fixtures. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the axial cross-sectional structure of the present invention; Figure 3 This is a schematic cross-sectional view of the present invention assembled with an SMD LED light source; Figure 4 This is a schematic diagram of the assembly of the present invention with the COB light source module. Detailed Implementation

[0017] Example 1: SMD light source panel light, classroom eye-protection light adapter The enclosed structure is integrally molded, with the inner wall featuring a matte, frosted closed-loop light-absorbing surface. A bottom annular protrusion limits the installation near the light source of the lamp panel. The overall height is higher than the lamp body, and the upper end is fitted to the main light-emitting surface area. The slightly constricted oral cavity, wider at the bottom and narrower at the top, constrains the side light, specifically designed to improve glare issues in indoor lighting.

[0018] Example 2: Cleanroom lamps and commercial lighting compatible models It adopts a dual-color injection-molded double-layer composite structure, with an inner layer of matte nylon for light absorption and an outer layer of white PC for light reflection, and the two layers have independent functional zones; it can be used for close-range application by adhesive backing or clips to meet the long-term stable operation requirements of cleanroom lighting fixtures.

[0019] Example 3: COB spotlight and track light compatible version The inner wall adopts a honeycomb light-absorbing texture and is coaxially fitted on the outside of the COB light source. It uses a progressively narrowing cavity to gather stray light, optimize the beam angle, and improve the purity of the light emitted by the lamp.

Claims

1. A closed-loop optical architecture for suppressing stray light at the source of a light source, characterized in that, The device includes an enclosing structure, wherein the lateral light-emitting area of ​​the LED light source is located close to the outer periphery of the light source; the inner side of the enclosing structure forms a continuous closed-loop circumferential light-absorbing surface, which completely surrounds the side of the light source; the enclosing structure only constrains and absorbs the lateral light from the light source, avoiding the axial direction of the light source's main light emission direction.

2. The LED light source stray light suppression optical architecture according to claim 1, characterized in that, The enclosed structure is a hollow, one-piece molded structure with an internal through-light path channel, which is coaxially arranged with the LED light source.

3. The LED light source stray light suppression optical architecture according to claim 1, characterized in that, The enclosed structure is a double-layer composite functional layer structure or a single-layer matte light-absorbing structure. The inner layer is a matte light-absorbing layer that forms the circumferential light-absorbing surface, and the outer layer is a high-brightness reflective layer. The inner layer only absorbs the lateral diffuse stray light from the light source, and the outer layer only regularly recovers the residual reflected light from the cavity. The two layers are functionally independent and do not overlap.

4. The LED light source stray light suppression optical architecture according to claim 1, characterized in that, The circumferential light-absorbing surface can be any one of the following continuous closed-loop extinction structures: matte frosted surface, annular light-absorbing groove, or honeycomb light-absorbing texture.

5. The LED light source stray light suppression optical architecture according to claim 2, characterized in that, The optical path channel has a uniformly tapered structure that is wider at the bottom and narrower at the top along the axial direction. The inner diameter of the light source end is larger than the inner diameter of the light-emitting end, forming a fixed-proportion progressive constraint cavity to limit the diffusion angle of lateral spill light. The overall height of the enclosed structure is slightly greater than the height of the light source body, and the light-emitting port at the top does not exceed the extension range of the main light-emitting surface of the light source, forming a close-fitting limiting structure at the near end.

6. The LED light source stray light suppression optical architecture according to claim 3, characterized in that, The matte light-absorbing layer is made of optical black PC, matte acrylic, or matte nylon; the high-gloss reflective layer is made of optical white PC or white acrylic.

7. The LED light source stray light suppression optical architecture according to claim 1, characterized in that, The bottom of the enclosing structure is provided with a positioning assembly part, which is a ring boss, a snap-fit ​​structure or an adhesive bonding surface, and is adapted to be closely fitted to the light source substrate.

8. The LED light source stray light suppression optical architecture according to claim 1, characterized in that, The overall structure is compatible with various LED light sources, including SMD discrete light sources, COB surface light sources, panel lights, classroom lights, and purification light modules.

9. The LED light source stray light suppression optical architecture according to claim 3, characterized in that, The double-layer structure is made by two-color one-piece injection molding, with tight bonding between the layers without gaps or relative displacement, resulting in strong structural stability.

10. The LED light source stray light suppression optical architecture according to any one of claims 1–9, characterized in that, Suitable for all types of low-glare lighting fixtures, including LED panel lights, classroom eye-protection lights, integrated purification lights, commercial lighting, recessed spotlights, and track spotlights.

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