Light source inwardly inclined side-emitting reflector cup

Abstract

The utility model relates to optical lighting technical field, concretely is a light source to the inside oblique side light-emitting reflector, including reflector main part, light source subassembly, aluminium base plate and reflector coating, light source subassembly is set up with the inclination alpha = 30, cooperate parabolic reflector, curvature radius R = L / 2, make light concentration reflection to central axis direction, light efficiency utilization rate is from traditional scheme's 65% to 88% promotion, effective light intensity improves 2.3 times, reflector opening edge tangent angle beta = 70, will edge light reflection to predetermined area, avoid to non-illumination direction scattering, glare value is from 28 to fall below 15, aluminium base plate and reflector main part pass through bolt fixation, form heat conduction path, cooperate bottom heat dissipation hole, make light source junction temperature to reduce 12 DEG C, light attenuation rate is every year less than or equal to 3%, inclination angle alpha can be adjusted in 15 degree 45 degree range, adapts to different illumination distance, through bolt fixation ensure angle stability, assembly error is less than or equal to 0.5 degree.

Description

Technical Field

[0001] This utility model relates to the field of optical lighting technology, specifically to a side-emitting reflector cup with the light source tilted inward. Background Technology

[0002] As is well known, in the field of side-emitting lighting technology, the side-emitting reflector is a core optical device that uses a reflective surface to focus and guide the light emitted by the light source to a specific area. It is widely used in automotive taillights, outdoor lighting, and display device backlights. Its core function is to achieve efficient light control and reduce glare by optimizing the relative position of the light source and the reflector and the shape of the reflective surface.

[0003] In existing side-emitting lighting devices, the light source is usually set perpendicular to the axis of the reflector, which causes the light to scatter in all directions, resulting in low light efficiency and prominent glare problems. When the light source is installed vertically, a large amount of light shines directly on the edge of the reflector, which forms stray light after reflection, resulting in a reduction in effective light intensity. The relative position of the light source and the reflector is not adjustable, which cannot meet the needs of different lighting scenarios. The light source component and the reflector body lack a coordinated heat dissipation design, and long-term use is prone to light decay due to high temperature. Utility Model Content

[0004] Technical problems to be solved

[0005] In order to overcome the problems of low light efficiency and stray light in existing side-emitting reflectors with inward tilted light sources, this utility model provides a side-emitting reflector with inward tilted light source that has high light efficiency and no stray light.

[0006] Technical solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a side-emitting reflector with the light source tilted inwards, comprising:

[0008] Reflector body, light source assembly, aluminum substrate, reflective coating;

[0009] The reflector cup body has a hollow cup-shaped structure with a reflective coating on its inner surface; and

[0010] The light source assembly is mounted on an aluminum substrate, and the aluminum substrate is set at an inclined angle α with the axis of the reflector body, so that the light-emitting surface of the light source assembly faces the inside of the reflector body.

[0011] Preferably, the tilt angle α between the light source assembly and the aluminum substrate is 15°-45°, and the optical axis of the light source assembly intersects the axis of the reflector body at the focal point of the inner surface of the reflector.

[0012] Furthermore, the inner surface of the reflector body is a parabolic structure with a radius of curvature of R, satisfying R=L / 2, where L is the opening diameter of the reflector body.

[0013] Furthermore, the aluminum substrate is fixed to the outside of the open end of the reflector body, the mounting plane of the aluminum substrate forms an angle α with the axis of the reflector body, and the light-emitting surface of the light source assembly is perpendicular to the aluminum substrate.

[0014] In a further embodiment, the reflective coating covers the inner surface of the reflective cup body, the reflectivity of the reflective coating is ≥95%, and the coating thickness is uniformly distributed.

[0015] Based on the aforementioned scheme, the parabolic structure of the reflector body has an angle β between the tangent at the edge of the opening and the axis, where β satisfies 60°-80°, ensuring that edge light is reflected towards the central axis.

[0016] Furthermore, based on the aforementioned scheme, the light source assembly includes LED beads and a focusing lens, the light-emitting surface of the focusing lens is parallel to the aluminum substrate, and the optical axis of the focusing lens is at the same tilt angle α as the aluminum substrate.

[0017] Furthermore, based on the aforementioned solution, the aluminum substrate and the reflector body are fixedly connected by bolts, with the bolt axis perpendicular to the mounting plane of the aluminum substrate to ensure the stability of the tilt angle α.

[0018] A heat dissipation hole is provided at the center of the bottom of the reflector body, and the axis of the heat dissipation hole coincides with the axis of the reflector body to dissipate heat from the light source component.

[0019] Beneficial effects

[0020] The light source features an inwardly tilted side-emitting reflector cup with a tilt angle of α=30°. Combined with a parabolic reflector cup with a radius of curvature R=L / 2, this concentrates light reflection towards the central axis, increasing luminous efficiency from 65% to 88% compared to traditional solutions. Effective light intensity is increased by 2.3 times. The tangent angle β=70° at the reflector cup opening edge reflects edge light to a predetermined area, preventing scattering in non-illuminating directions. Glare value is reduced from 28 to below 15. The aluminum substrate and reflector cup body are fixed with bolts, forming a heat conduction path. Combined with bottom heat dissipation holes, this lowers the light source junction temperature by 12°C, resulting in a light decay rate of ≤3% per year. The tilt angle α is adjustable within the range of 15°-45° to adapt to different lighting distances. Bolt fixing ensures angle stability, with an assembly error of ≤0.5°. Attached Figure Description

[0021] Figure 1 This is a side view of the structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the reflective coating structure of this utility model;

[0023] Figure 3This is a schematic diagram of the structure of the light source assembly of this utility model;

[0024] Figure 4 This is a schematic diagram of the main structure of the reflector cup of this utility model;

[0025] Figure 5 This is a schematic diagram of the aluminum substrate of this utility model.

[0026] In the image: 1. Reflector body; 2. Light source assembly; 3. Aluminum substrate; 4. Reflective coating. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] See Figures 1-5 A side-emitting reflector with an inwardly tilted light source achieves efficient light control and low glare output in side-emitting scenarios through the tilted collaborative design of the light source component 2 and the reflector body 1 and the parabolic optical structure. The core solution is as follows: the light source component 2 is installed on the outside of the opening end of the reflector body 1 at an tilt angle α of 15°-45° through the aluminum substrate 3, with the light-emitting surface facing the inside of the reflector. The inner surface of the reflector body 1 is a parabolic structure with a radius of curvature R=L / 2 (L is the opening diameter). Combined with the tangent angle β of 70° at the opening edge, the tilted incident light is reflected to the central axis direction, increasing the light efficiency from 65% in the traditional solution to 88% and reducing the glare value to below 15.

[0029] First, refer to Figure 2 In this embodiment, the parabolic structure is formed by die casting of aluminum alloy, and the inner surface is precision machined to form a parabolic surface. The equation is satisfied, and the focal point is located at the intersection of the axis of the reflector body 1 and the optical axis of the light source. The opening diameter L of the parabolic surface is set according to the application scenario (e.g., L=80mm for car taillights), and the radius of curvature R=40mm, ensuring that the oblique light emitted by the light source is reflected and emitted parallel to the central axis to form a concentrated beam.

[0030] The angle β = 70° between the tangent at the edge of the opening and the axis. This angle causes the light reflected from the edge to converge toward the central axis, avoiding scattering in non-illuminating directions. An additional 1mm wide light-blocking lip is added to the edge area to block direct light and further reduce glare.

[0031] The inner surface of the reflective coating 4 is covered with an aluminum-based reflective coating 4 by vacuum evaporation process. The coating has a thickness of 2μm, a reflectivity of ≥95%, and a coating uniformity error of ≤3%. The coating surface is anodized to form a rough texture (roughness Ra=0.2μm), which enhances the diffuse reflection effect and makes the beam distribution more uniform.

[0032] Then, refer to Figure 3 In this embodiment, the light source assembly 2 (such as 3535 packaged LED beads + focusing lens) is vertically fixed on the aluminum substrate 3. The aluminum substrate 3 is tilted at an angle of α=30° with the axis of the reflector body 1. It is fixed to the flange surface on the outside of the reflector opening end by 4 M3 bolts. The bolt axis is perpendicular to the plane of the aluminum substrate 3. The tightening torque is controlled at 1.5-2 N·m to ensure the stability of the tilt angle and the assembly error ≤0.5°.

[0033] The focusing lens is made of PMMA material, with the light-emitting surface parallel to the aluminum substrate 3. The optical axis is tilted by an angle α with the aluminum substrate 3. The focal length of the lens is f=10mm, which compresses the LED divergence angle from 120° to 60°. Combined with parabolic reflection, the beam concentration is increased by 2.3 times.

[0034] The aluminum substrate 3 is 2mm thick and made of 1060 pure aluminum with a thermal conductivity of ≥200W / (m・K). A 10mm diameter heat dissipation hole is opened at the center of the bottom of the reflector body 1. A copper heat dissipation column is embedded in the hole and contacts the back of the aluminum substrate 3, forming a heat conduction path of "aluminum substrate 3-copper column-reflector body 1". The junction temperature of the light source is reduced by 12℃ compared with the traditional vertical installation, and the long-term light decay rate is ≤3% / year.

[0035] Secondly, see Figure 1 In this embodiment, an annular positioning groove is provided on the inner side of the opening end of the reflector body 1, and the edge of the aluminum substrate 3 is embedded in the groove with a fitting gap of ≤0.1mm, ensuring that the intersection of the light source optical axis and the reflector axis is accurately located at the focal point of the parabolic surface. The positioning groove is 3mm deep and the verticality error of the groove wall is ≤0.05mm.

[0036] The aluminum substrate 3 has wires welded to its back and led out through the wire hole at the bottom of the reflector body 1. The edge of the wire hole is equipped with a rubber sealing ring, and the waterproof rating reaches IP65, making it suitable for outdoor scenarios.

[0037] Again, see Figure 1 In this embodiment, the installation and debugging of the side-emitting application of the automotive taillights are as follows:

[0038] The reflector body 1 is fixed to the inside of the taillight housing with bolts, with the open end facing the taillight light-transmitting cover. The aluminum substrate 3 is installed at an angle of α=45°, and the light source assembly 2 faces the inside of the reflector. The optical axis and the axis of the reflector intersect at the focal point of the parabolic surface (30mm from the open end).

[0039] When connected to a 12V power supply, the LED light beads emit light, which is compressed by a focusing lens and then projected at a 45° angle onto a parabolic surface. After reflection, a beam of light parallel to the taillight axis is formed. After passing through the light-transmitting cover, a clear side-emitting light band is formed, with an effective light intensity of 800cd, which is 1.8 times higher than that of traditional vertical installation, and a glare value of 12.

[0040] After working continuously for 2 hours, the temperature of the aluminum substrate 3 was measured to be ≤55℃ using an infrared thermometer, and the temperature at the heat dissipation hole at the bottom of the reflector body 1 was ≤45℃, which meets the temperature resistance requirements of automotive electronic components.

[0041] Adjusting the side lighting parameters of outdoor wall lamps:

[0042] Increase the diameter of the reflector opening to L=120mm, the radius of curvature R=60mm, and adjust α to 15° to tilt the beam towards the ground and avoid upward glare.

[0043] The focusing lens is replaced with an f=15mm model, the divergence angle is controlled at 80°, and with the parabolic reflection, a uniform lighting strip with a width of 3 meters is formed at a distance of 5 meters from the wall lamp. The ground illuminance is ≥15 lux, the light efficiency is 85%, and it is suitable for outdoor walkway lighting.

[0044] In addition, see Figure 5 In this embodiment, an angle adjustment mechanism is added between the aluminum substrate 3 and the reflector body 1. The gear rack structure is driven by a knob, so that α can be continuously adjusted in the range of 15°-45°. The knob scale accuracy is 1° to meet different lighting distance requirements (such as α=45° for close distance and α=15° for long distance).

[0045] By changing the parabolic surface to a freeform surface and optimizing the surface equation through optical simulation, the light beam can be spread 120° in the horizontal direction and compressed to 30° in the vertical direction, forming a fan-shaped light pattern, which is suitable for side lighting scenarios on billboards.

[0046] Finally, see Figure 1 In this embodiment, the ceramic reflective coating 4 is replaced with a nano-ceramic reflective coating 4, which increases the reflectivity to 98%, enhances weather resistance, and shows no oxidation after 1000 hours of testing in a salt spray environment (5% NaCl solution, 35°C), making it suitable for outdoor lighting in coastal areas.

[0047] The reflector body 1 is made of die-cast aluminum-copper composite material. A miniature fan (20mm in diameter, 2000rpm) is embedded in the bottom heat dissipation hole. Forced air cooling reduces the junction temperature of the light source by another 8℃, making it suitable for high-power LEDs (such as 3W single LED beads).

[0048] Working principle:

[0049] The light source is a side-emitting reflector that is tilted inwards. When using it, the light source should first be incident at an angle.

[0050] The light emitted by the LED beads is collimated by the condenser lens and incident on the parabolic surface of the reflector at an angle of α=30°. The central light beam is reflected after hitting the focal point to form a parallel beam, while the edge light beams are reflected by the parabolic surface and converge toward the central axis to form a uniform light spot with a diameter of 300mm.

[0051] Glare suppression principle:

[0052] The tangent angle β=70° of the reflector cup opening edge reflects light with an incident angle greater than 60° to an elevation angle area of ​​≤15°, avoiding direct exposure to the human eye. Combined with the light output angle (120°) of the condenser lens, a low glare effect of UGR≤15 is achieved.

[0053] The heat generated by the light source assembly 2 is conducted through the path of aluminum substrate 3 → bolt → reflector body 1 → heat conduction column → heat sink. The heat dissipation holes at the bottom promote air convection, keeping the junction temperature of the lamp beads below 65℃ and ensuring long-term stable luminous flux.

[0054] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A light source inwardly inclined side-emitting reflector cup, characterized in that, include: The reflector body (1), the light source assembly (2), the aluminum substrate (3), and the reflective coating (4); The reflective cup body (1) is a hollow cup-shaped structure, and a reflective coating (4) is provided on the inner surface. The light source assembly (2) is mounted on an aluminum substrate (3). The aluminum substrate (3) is set at an angle α to the axis of the reflector body (1), so that the light-emitting surface of the light source assembly (2) faces the inside of the reflector body (1).

2. The light source inwardly inclined side-emitting reflector cup of claim 1, wherein, The tilt angle α between the light source assembly (2) and the aluminum substrate (3) is 15°-45°, and the optical axis of the light source assembly (2) intersects the axis of the reflector body (1) at the focal point of the inner surface of the reflector.

3. The side-emitting reflector with the light source tilted inward as described in claim 2, characterized in that, The inner surface of the reflector body (1) is a parabolic structure with a radius of curvature of R, which satisfies R=L / 2, where L is the opening diameter of the reflector body (1).

4. The side-emitting reflector with the light source tilted inward as described in claim 3, characterized in that, The aluminum substrate (3) is fixed to the outside of the opening end of the reflector body (1). The mounting plane of the aluminum substrate (3) forms an angle α with the axis of the reflector body (1). The light-emitting surface of the light source assembly (2) is perpendicular to the aluminum substrate (3).

5. The side-emitting reflector with the light source tilted inward as described in claim 4, characterized in that, The reflective coating (4) covers the inner surface of the reflective cup body (1), and the reflectivity of the reflective coating (4) is ≥95%, and the coating thickness is uniformly distributed.

6. The side-emitting reflector with the light source tilted inward as described in claim 5, characterized in that, The parabolic structure of the reflector body (1) has an angle β between the tangent at the edge of the opening and the axis, where β satisfies 60°-80°, ensuring that the edge light is reflected towards the central axis.

7. The side-emitting reflector cup with the light source tilted inward as described in claim 6, characterized in that, The light source assembly (2) includes LED beads and a condenser lens. The light-emitting surface of the condenser lens is parallel to the aluminum substrate (3), and the optical axis of the condenser lens is at the same tilt angle α as the aluminum substrate (3).

8. The side-emitting reflector cup with the light source tilted inward according to claim 7, characterized in that, The aluminum substrate (3) is fixedly connected to the reflector body (1) by bolts, and the bolt axis is perpendicular to the mounting plane of the aluminum substrate (3) to ensure the stability of the tilt angle α. A heat dissipation hole is provided at the bottom center of the reflector body (1), and the axis of the heat dissipation hole coincides with the axis of the reflector body (1) for heat dissipation of the light source assembly (2).

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