A single-reflection ambient light

Abstract

This invention discloses a single-reflection ambient light, comprising a housing and a light-emitting device. A cavity is formed within the housing, and the light-emitting device is disposed within the cavity. A reflective surface is disposed within the cavity, and a reflective cavity is formed between the reflective surface and the housing. At least one light-emitting port is disposed on the housing, communicating with the reflective cavity. The radial cross-sectional profile of the reflective surface is at least partially an elliptical arc segment. The light-emitting element of the light-emitting device is disposed at the first focal point of the ellipse containing the elliptical arc segment, and the illumination direction of the light-emitting element is towards the reflective surface. At least one light-emitting port is disposed at or near the second focal point of the ellipse containing the elliptical arc segment. This single-reflection ambient light eliminates the need for polymer light guides and complex double-mirror light channels, achieving channel light efficiency with only a single reflective surface. It has fewer parts, lower cost, and simpler assembly. The reflective surface utilizes the elliptical bifocal optical properties of physics, effectively improving light utilization.

Description

Technical Field

[0001] This invention relates to the field of automotive interior lighting technology, and more particularly to a single-reflector ambient light. Background Technology

[0002] Components used for vehicle interior lighting and decoration, such as ambient lighting, typically include a housing 010, a light guide element 020, and a light source element 030 for emitting light. A receiving space is formed within the housing 010, and both the light guide element 020 and the light source element 030 are housed within this space. The light emitted by the light source element 030 needs to be guided by the light guide element 020 and emitted from a light port 011 on the housing 010. This device can be used for combined contour lighting and ambient lighting inside motor vehicles. Currently, there are two main types of light guide elements 020 used in the market:

[0003] One type is a dual-component light guide, consisting of a transparent light guide 021 and a diffuse light guide 022, such as... Figure 1 As shown, light emitted from the light source 030 enters through the incident light coupling surface of the transparent light guide 021, then propagates through the transparent light guide 021 and enters the diffuse light guide 022, before exiting from the light emitting surface of the diffuse light guide 022 to the light port 011. The light guide is typically made of a certain polymer material, such as optical-grade plastic. The selection range of this material is limited and the price is expensive. Furthermore, dual-component light guides generally require a two-color injection molding process, which is complex and costly.

[0004] Another type uses a reflector assembly 023 with a diffuser light guide. A light guide channel is formed between the two reflectors, and the diffuser light guide is positioned between the exit of the light guide channel and the optical port 011 of the housing 010. Figure 2 As shown, light emitted from the light source 030 enters the light guide channel through the inlet, is reflected by two mirrors, and then exits from the outlet of the light guide channel into the diffuser light guide. Finally, it exits from the light-emitting surface of the diffuser light guide 022 to the light port 011. The mirrors are made of non-transparent material, and their reflective surfaces require a fine-grained texture to create diffuse reflection. The reflective surfaces also have a reflective metal layer or are made directly from a highly reflective white material. This type of light guide component has a large number of parts, making assembly complex and costly.

[0005] Both of the above optical systems only transmit light emitted from the light source to the light port in the form of a fixed optical channel. The effective utilization rate of light is not high, and the required installation space is large. The size of this product can only be installed in places with large space, such as the dashboard, which is not conducive to the promotion and use of vehicle manufacturers in places with smaller space, such as door panels and A / B pillars.

[0006] Therefore, given the aforementioned technical problems, new innovations are necessary. Summary of the Invention

[0007] The purpose of this invention is to at least address one of the shortcomings of the prior art; therefore, a single-reflection ambient light is proposed, the specific solution of which is as follows:

[0008] A single-reflection ambient light includes a housing and a light-emitting device. A cavity is formed within the housing, and the light-emitting device is disposed within the cavity. A reflective surface is disposed within the cavity, and a reflective cavity is formed between the reflective surface and the housing. At least one light-emitting port is disposed on the housing, and the light-emitting port communicates with the reflective cavity. The radial cross-sectional profile of the reflective surface is at least partially an elliptical arc segment. The light-emitting element of the light-emitting device is disposed at the first focal point of the ellipse containing the elliptical arc segment, and the illumination direction of the light-emitting element is towards the reflective surface. At least one light-emitting port is disposed at or near the second focal point of the ellipse containing the elliptical arc segment.

[0009] Furthermore, the light outlet is elongated, and the length direction of the reflective surface is consistent with the length direction of the light outlet.

[0010] Furthermore, the reflective surface is disposed on the inner wall of the outer casing.

[0011] Furthermore, it includes a reflective device disposed within the accommodating cavity, and the reflective surface is disposed on one side of the reflective device.

[0012] Furthermore, the reflecting device includes one or more reflectors, one side of which is provided with the reflective surface, and the plurality of reflectors are distributed along the length direction of the light outlet.

[0013] Furthermore, the light-emitting device also includes a light-emitting element carrier plate, which is elongated and its length direction is consistent with the length direction of the light-emitting port. The light-emitting element is disposed on the light-emitting element carrier plate, and the light-emitting direction of the light-emitting element is towards the reflective surface.

[0014] Furthermore, the light-emitting element carrier plate includes one or more carrier plates, on which one or more light-emitting elements are disposed, and the plurality of carrier plates are distributed along the length direction of the light outlet.

[0015] Furthermore, the light outlet is provided with a light-emitting part for diffusing light. The light-emitting part is transparent or partially transparent. The light-inlet side of the light-emitting part is located at or near the second focal point. At least part of the light rays incident on the second focal point in the accommodating cavity can pass through the light-emitting part and be emitted from the light outlet.

[0016] Furthermore, the light-emitting part is a transparent diffuse light-emitting part; or the light-emitting part is a partially transparent diffuse light-emitting part; or the light-emitting part is provided with scattering particles, and / or pores, and / or textures.

[0017] Furthermore, the angle between the normal of the light-emitting element carrier plate and the normal of the light-emitting part on the light-inlet side is 60° to 120°.

[0018] Furthermore, the angle between the normal of the light-emitting element carrier plate and the normal of the light-emitting part's light-inlet side is a-30° to a+30°. When the angle is a°, the light emitted by the light-emitting element along the normal of the light-emitting element carrier plate is reflected by the reflective surface and can pass through the second focal point and be emitted parallel to the normal of the light-emitting part's light-inlet side.

[0019] Furthermore, the major axis of the ellipse containing the elliptical arc segment is at least twice its minor axis.

[0020] Furthermore, the reflective surface is a smooth surface; or the reflective surface is provided with optical patterns; the reflective surface is provided with a reflective metal layer; or the reflective surface is white.

[0021] Compared with the prior art, the single-reflection ambient light of this application has at least one or more of the following beneficial effects:

[0022] This application's single-reflection ambient light eliminates the need for polymer light guides and complex double-mirror light channels, achieving channel lighting efficiency with just a single reflective surface. The single-reflective surface design transforms the previously fixed light path into an open one, allowing for greater design flexibility. It also enables the multi-color light emitted by the light-emitting element to fully mix within the open space, achieving uniform light of any color. Furthermore, the single-reflective surface design reduces the number of parts in the ambient light, lowering costs and simplifying the assembly process. The design also eliminates size constraints on the light inlet and outlet of the light guide channel, allowing for flexible design of the optical path length. The reflective surface utilizes the elliptical bifocal optical property from physics, meaning that light emitted from one focal point will converge at the other focal point after elliptical reflection, effectively improving light utilization. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the radial cross-sectional structure of an ambient light when the light guide element is a dual-component light guide in the prior art;

[0024] Figure 2 This is a schematic diagram of the radial cross-sectional structure of an ambient light when the light guide element is a reflector group plus a diffuse light guide in the prior art;

[0025] Figure 3 An exploded structural diagram of a single-reflection ambient light provided in an embodiment of this application;

[0026] Figure 4 A schematic diagram of the radial cross-sectional structure of a single-reflection ambient light provided in an embodiment of this application;

[0027] Figure 5 A schematic diagram showing the installation position of the single-reflection ambient light source and the light-inlet side of the light-emitting part in an embodiment of this application;

[0028] Figure 6 This is a schematic diagram illustrating the principle of the elliptical bifocal optical characteristics provided in the embodiments of this application.

[0029] Among them, 010-housing, 011-light port, 020-light guide element, 021-transparent light guide, 022-diffuse light guide, 023-reflector group, 030-light source element, 100-outer shell, 110-reflective surface, 120-first housing, 130-second housing, 140-accommodating cavity, 150-reflective cavity, 160-light outlet, 111-first focal point, 112-second focal point, 200-light emission device, 210-light emission element, 220-light emission element carrier plate, 300-reflection device, 400-light emission section, 410-light intake side. Detailed Implementation

[0030] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the following detailed description of the specific implementation methods, structure, features and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0031] Example

[0032] This embodiment provides a single-reflection ambient light, which includes a housing 100 and a light-emitting device 200. A receiving cavity 140 is formed within the housing 100, and the light-emitting device 200 is disposed within the receiving cavity 140. At least one light-emitting port 160 is provided on the housing 100, and the light-emitting port 160 communicates with the receiving cavity 140. The housing 100 is preferably elongated, and the light-emitting port 160 is also preferably elongated. The length direction of the light-emitting port 160 is preferably aligned with the length direction of the housing 100. Of course, the length direction of the light-emitting port 160 may also have a certain angle with the length direction of the housing 100.

[0033] like Figures 3 to 5As shown in the figure, the outer casing 100, schematically illustrated, is preferably composed of a first casing 120 and a second casing 130 made of plastic. After the first casing 120 and the second casing 130 are fixedly connected, the accommodating cavity 140 is formed between them. The first casing 120 and the second casing 130 can be positioned and fixedly connected by welding, gluing, riveting, or fasteners or other fasteners or structures. One end of the second casing 130 is spaced from the first casing 120, thereby forming a light-emitting port 160 communicating with the accommodating cavity 140. Of course, the above is only a preferred embodiment. In another embodiment, the first casing 120 and the second casing 130 can also be tightly fixedly connected, and the light-emitting port 160 can be located on the first casing 120, on the second casing 130, or at the connection between the first casing 120 and the second casing 130. In another embodiment, the outer shell 100 may also be an integral shell structure or a combination of more shells. Since the outer shell 100 is a relatively conventional component and can be flexibly set as needed in specific implementation, it will not be described in detail here.

[0034] A reflective surface 110 is provided within the accommodating cavity 140 to constrain the entry and exit of light. The length direction of the reflective surface 110 is consistent with the length direction of the light exit port 160. A reflective cavity 150 is formed between the reflective surface 110 and the outer casing 100, and the light exit port 160 communicates with the reflective cavity 150. The radial cross-sectional profile of the reflective surface 110 is at least partially an elliptical arc segment. The light-emitting element 210 of the light-emitting device 200 is located at the first focal point 111 of the ellipse containing the elliptical arc segment, and the illumination direction of the light-emitting element 210 is towards the reflective surface 110. At least one light exit port 160 is located at or near the second focal point 112 of the ellipse containing the elliptical arc segment. When the light exit port 160 is located near the second focal point 112, the distance between the light exit port 160 and the second focal point 112 is preferably no more than 1 cm, and more preferably no more than 5 mm. Figures 3 to 5As shown in the figure, a preferred embodiment is illustrated, in which a reflective device 300 is disposed within the accommodating cavity 140. The reflective device 300 is elongated, and its length direction is consistent with the length direction of the light outlet 160. The reflective surface 110 is disposed on one side of the reflective device 300. The reflective device 300 can be a single reflector or a combination of multiple slightly shorter reflectors distributed along the length direction of the light outlet 160. Adjacent reflectors can be fixedly connected by material matching, such as adhesive bonding, or force matching, such as snap-fit ​​connection, to form an elongated reflective device 300. The reflective surface 110 is disposed on one side of the reflector. The radial cross-sectional profile of the reflective surface 110 is elliptical, utilizing the elliptical bifocal optical characteristic, i.e., the light emission point and the light emission point are respectively disposed at the two foci of the elliptical reflective surface 110, such as... Figure 6 As shown, this ensures that most of the light is reflected towards the light outlet 160, thereby effectively reducing energy consumption, improving light utilization, and increasing luminous efficiency. Of course, the above is only a preferred embodiment. In specific implementations, the shape of the reflective surface 110 is not limited to the one described above. When the brightness of the light-emitting element 210 is sufficient, its radial cross-sectional profile can be only partly an elliptical arc segment, while other parts can be straight segments, arc segments, combinations of straight and arc segments, combinations of straight and straight segments, combinations of arc segments, or other shapes. In other embodiments, the reflective surface 110 can also be disposed on the inner wall of the outer casing 100, that is, the inner wall surface of the outer casing 100, for example... Figure 4 The inner wall surface of the first housing 120 shown serves as the reflective surface 110. This design can be applied to ambient lighting products with limited space, allowing the product to be installed in a small space within the vehicle body.

[0035] In a further embodiment, the ellipse containing the elliptical arc segment preferably has a major axis that is at least twice its minor axis, and more preferably three times or more, so that the reflective surface 110 has a long and flat shape. That is, the reflective device 300 or the housing 100 can be designed to be flatter, so that it can be installed in narrow and deep spaces such as door panels, A and B pillars, or instrument panels with strict dimensions.

[0036] In a further embodiment, the reflective surface 110 can be designed as a smooth surface according to the light emission requirements, or an optical pattern can be provided on the reflective surface 110. The reflective device 300 or the housing 100 used to form the reflective surface 110 is made of a non-transparent material, that is, completely opaque. The reflective surface 110 can be a reflective metal layer, such as an aluminum or chromium metal layer, obtained by spraying or electroplating on one side of the reflective device 300 or the inner wall of the housing 100. Alternatively, one side of the reflective device 300 or the inner wall of the housing 100 can be made white, for example, the reflective device 300 or the housing 100 can be made directly from a high-reflectivity white material.

[0037] It should be noted that the light-emitting port 160 on the housing 100 is not limited to one; there can be multiple light-emitting ports 160. Except for the light-emitting port 160 located at or near the second focus 112 of the ellipse containing the elliptical arc segment, the positions of the other light-emitting ports 160 are not limited and can be designed as needed. Furthermore, the size of the light-emitting port 160 and the optical path distance from the light-emitting element 210 to the light-emitting port 160 can be adjusted according to the requirements of the optical effect.

[0038] In a further embodiment, the light-emitting device 200 preferably further includes a light-emitting element carrier plate 220, and the light-emitting element 210 is disposed on the light-emitting element carrier plate 220, such as... Figure 3 and Figure 4 As shown. The light-emitting element carrier plate 220 is preferably elongated, and its length direction is consistent with the length direction of the light-emitting port 160. There is at least one light-emitting element 210, or if there are multiple light-emitting elements, the light-emitting elements 210 are distributed along the length direction of the light-emitting element carrier plate 220, and the light-emitting direction of the light-emitting elements 210 is towards the reflective surface 110. The reflective element carrier plate can be a single carrier plate or a combination of multiple carrier plates distributed along the length direction of the light-emitting port 160. One or more light-emitting elements 210 are disposed on the carrier plate. The light-emitting element 210 is preferably a light-emitting diode (LED), and when multiple LEDs are present, these LEDs are physically and electrically connected. For example, the carrier plate is preferably a circuit board, and the LEDs are disposed on the circuit board, and each LED is electrically connected through the circuit board. These LEDs can be lit by the same color or different colors. Multiple LEDs can produce mixed light, such as mixed white light.

[0039] In the above-described embodiment of the reflective device 300, the light-emitting element carrier plate 220 is preferably fixedly connected to the reflective device 300. This connection can be achieved through welding, gluing, riveting, or using fasteners such as screws or clips, ensuring that the center of the light-emitting element 210 is located at the first focal point 111 of the reflective surface 110. The sub-assembly consisting of the reflective device 300 and the light-emitting device 200 is preferably fixedly connected to the second housing 130. This can be achieved by either fixing the reflective device 300 to the second housing 130 or by fixing the light-emitting element carrier plate 220 to the second housing 130. The fixing method can be welding, gluing, riveting, or using fasteners such as screws or clips, ensuring that the emitted light is located at the second focal point 112 of the reflective surface 110. The reflective device 300 preferably uses a combination of multiple reflectors, and the light-emitting element carrier plate 220 also uses a combination of multiple carrier plates, with each carrier plate corresponding to a reflector. This is because the existing circuit board manufacturing capabilities are limited and cannot meet the production needs of longer circuit boards. Therefore, in specific designs, if a longer carrier board is required, the current market production capacity can only achieve this by combining and splicing multiple shorter circuit boards. Of course, when the market production capacity can meet the manufacturing needs, the carrier board can also be a single circuit board. However, as the length of the circuit board increases, its production cost and tolerance will increase accordingly, and the same applies to the reflector 300. Therefore, using a combination splicing method can shorten the length of the reflector and the circuit board, thereby effectively reducing production costs and tolerances. Moreover, each reflector and each circuit board can be installed independently, which can better control the installation accuracy between the reflector and the light-emitting element 210, thereby effectively improving the uniformity and brightness of the emitted light. Of course, the above is only a preferred solution. In specific implementations, the reflector 300 and the light-emitting element carrier board 220 can both be integral structures, both be combined splicing structures, or one can be an integral structure while the other is a combined splicing structure.

[0040] Since the light-emitting element 210 is located at the first focal point 111 of the ellipse where the elliptical arc segment is located, the light emitted by the light-emitting element 210 will be reflected and directed to the second focal point 112 when it hits the reflective surface 110 of the elliptical arc segment.

[0041] In a further embodiment, the light outlet 160 is preferably provided with a light-emitting portion 400 for diffusing light, and the light-emitting portion 400 is transparent or partially transparent. For example... Figure 3 and Figure 4As shown in the figure, a preferred embodiment is illustrated. The light-emitting part 400 is elongated, with its length aligned with the length of the light-emitting port 160, and covers the inner side of the light-emitting port 160. The light-emitting part 400 is preferably fixedly connected to the second housing 130, for example, by welding, gluing, riveting, or using screws, clips, or other fasteners or structures for positioning and fixing. The inner side of the light-emitting part 400, i.e., the side facing away from the light-emitting port 160, is its light-inlet side 410. The outer side of the light-emitting part 400, i.e., the side facing the light-emitting port 160, is its light-emitting side. Preferably, the light-emitting part 400 is a transparent diffuse light-emitting part, i.e., it is made of a colorless and transparent diffuser material. In this embodiment, preferably, the light-inlet side 410 of the light-emitting part 400 is located at the second focal point 112, and at least part of the light rays incident on the second focal point 112 from the accommodating cavity 140 can pass through the light-emitting part 400 and exit from the light-emitting port 160. Of course, the light-inlet side 410 of the light-emitting part 400 can also be located near the second focal point 112, preferably at a distance of no more than 1 cm from the second focal point 112, more preferably no more than 5 mm. Furthermore, the light-emitting part 400 is not limited to the above-mentioned type. For example, the light-emitting part 400 can also be a partially transparent diffuse light-emitting part, i.e., it is made of a partially transparent diffuse material; or, for example, one or more of the following can be provided on the light-emitting part 400: scattering particles, pores, or textures. The texture can be, for example, a leather texture or an optical pattern, provided on the light-inlet side 410 or the light-emitting side of the light-emitting part 400 to achieve the desired optical effect.

[0042] The angle between the normal of the light-emitting element carrier plate 220 and the normal of the light-emitting section 400 light-inlet side 410 is 0° to 180°. In order to fully mix the light, such as RGB three-color mixing, to prevent most of the light emitted by the light-emitting element 210 from directly reaching the light-emitting port 160, and to effectively improve the light efficiency so that most of the light can be reflected to the light-emitting port 160, the angle between the normal of the light-emitting element carrier plate 220 and the normal of the light-emitting section 400 light-inlet side 410 is preferably 60° to 120°, and more preferably 75° to 105°.

[0043] In a further preferred embodiment, the angle between the normal of the light-emitting element carrier plate 220 and the normal of the light-emitting section 400's light-inlet side 410 is a-30° to a+30°. When the angle is a°, the light emitted by the light-emitting element 210 along the normal of the light-emitting element carrier plate 220 is reflected by the reflective surface 110, passes through the second focal point 112, and is emitted parallel to the normal of the light-emitting section 400's light-inlet side 410. That is, assuming the light-emitting element carrier plate 220 is located at position A, the angle between the normal of the light-emitting element carrier plate 220 and the normal of the light-emitting section 400's light-inlet side 410 is a-30° to a+30°. The angle between the normals of the light-inlet side 410 and the light source side 410 is a°. The light emitted by the light-emitting element 210 at the first focal point 111 along the normal (direction of strongest light) of the light-emitting element carrier plate 220 is reflected by the reflective surface 110, passes through the second focal point 112, and is emitted parallel to the normal of the light-inlet side 410 of the light-emitting part 400. Therefore, when the light-emitting element carrier plate 220 is installed, the angle between its normal and the normal of the light-inlet side 410 of the light-emitting part 400 can be a-30° to a+30°, more preferably a-15° to a+15°. Within this range, most of the light can be emitted from the reflective surface 110 at an angle smaller than the normal of the light-inlet side 410 of the light-emitting part 400, thereby further improving the light efficiency.

[0044] It should be noted that the above-described arrangement of the light-emitting part 400, the light-emitting device 200, the reflective device 300, or the housing 100 is only a preferred embodiment. In specific implementations, the arrangement of each component can be flexibly selected according to needs, as long as the relative positions of the light-emitting device 200, the light-emitting part 400, and the reflective surface 110 are fixed and the positions of light incidence and emission are ensured through material matching, force matching, or integration. For example, the light-emitting part 400 can also form a dual-component housing with the housing 100, such as the first housing 120 or the second housing 130, through a two-color injection molding process. The dual-component housing has an opaque housing part and a transparent or partially transparent light-emitting part 400. The housing part is made of an opaque colored material. The outer surface of the housing part can be sprayed with different colored liquid solvents as needed to meet the requirements of interior color, gloss, etc. The spraying material can be a transparent solvent, an opaque colored solvent, or a combination of multiple layers of transparent and opaque colored solvents. By integrating the light-emitting part 400 with the housing 100, processing costs and installation time are reduced, while ensuring an accurate and secure connection between the light-emitting part 400 and the housing 100. Alternatively, the light-emitting part 400 can be first fixedly connected to the reflecting device 300, and then fixedly connected to the housing 100, such as the first housing 120 or the second housing 130, in a sub-assembly form. Furthermore, the housing 100, such as the first housing 120, and the reflecting device 300 can also form a dual-component assembly, which can then be integrated using a two-color injection molding process or another process.

[0045] Compared with the prior art, the single-reflection ambient light of this application has at least one or more of the following beneficial effects:

[0046] The single-reflection ambient light of this application abandons the polymer light guide and the complex double-mirror light channel, and achieves the channel light effect by setting only a single reflective surface 110. The single reflective surface 110 design makes the originally fixed light path open, and the design is more flexible. The single reflective surface 110 design allows the multi-color light emitted by the light-emitting element 210 to be fully mixed in the open space, so as to achieve uniform light of any color. The single reflective surface 110 design can reduce the number of parts of the ambient light, reduce costs, and simplify the assembly process. The single reflective surface 110 design allows the light inlet and light outlet 160 of the light guide channel to be free of size constraints, and the optical path length can be flexibly designed. The reflective surface 110 uses the elliptical bifocal optical property in physics, that is, the light emitted from one focal point will converge to the other focal point after reflection by an ellipse, which can effectively improve the light utilization rate.

[0047] In this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, which includes not only the elements listed but also other elements not expressly listed.

[0048] In this document, the directional terms such as front, back, top, and bottom are defined based on the location of the components in the accompanying drawings and their relative positions to each other, solely for the purpose of clarity and convenience in expressing the technical solution. It should be understood that the use of these directional terms should not limit the scope of protection claimed in this application.

[0049] Where there is no conflict, the above embodiments and features described herein can be combined with each other.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A single-reflection ambient light, characterized in that, It includes a housing (100) and a light-emitting device (200). A receiving cavity (140) is formed within the housing (100). The light-emitting device (200) is disposed within the receiving cavity (140). A reflective surface (110) is provided within the receiving cavity (140). A reflective cavity (150) is formed between the reflective surface (110) and the housing (100). At least one light-emitting port (160) is provided on the housing (100). The light-emitting port (160) is connected to the housing (100)... The reflective cavity (150) is connected, and the radial cross-sectional profile of the reflective surface (110) is at least partially an elliptical arc segment. The light-emitting element (210) of the light-emitting device (200) is located at the first focal point (111) of the ellipse where the elliptical arc segment is located. The irradiation direction of the light-emitting element (210) is towards the reflective surface (110). At least one of the light-emitting ports (160) is located at or near the second focal point (112) of the ellipse where the elliptical arc segment is located. The light-emitting device (200) further includes a light-emitting element carrier plate (220), which is elongated and the length direction of the light-emitting element carrier plate (220) is consistent with the length direction of the light-emitting port (160). The light-emitting element (210) is disposed on the light-emitting element carrier plate (220), and the light-emitting direction of the light-emitting element (210) is towards the reflective surface (110). The light outlet (160) is provided with a light-emitting part (400) for diffusing light. The light-inlet side (410) of the light-emitting part (400) is located at or near the second focal point (112). At least part of the light rays that are incident on the second focal point (112) in the accommodating cavity (140) can pass through the light-emitting part (400) and be emitted from the light outlet (160). The angle between the normal of the light-emitting element carrier plate (220) and the normal of the light-emitting part (400) light-inlet side (410) is a-30°~a+30°. When the angle is a°, the light emitted by the light-emitting element (210) along the normal of the light-emitting element carrier plate (220) is reflected by the reflective surface (110) and can pass through the second focal point (112) and be emitted parallel to the normal of the light-inlet side (410) of the light-emitting part (400). The light-emitting part (400) is a transparent diffuse light-emitting part; or The light-emitting part (400) is a partially transparent diffuse light-emitting part; or The light-emitting part (400) is provided with scattering particles, and / or pores, and / or textures.

2. The single-reflection ambient light according to claim 1, characterized in that, The light outlet (160) is elongated, and the length direction of the reflective surface (110) is consistent with the length direction of the light outlet (160).

3. The single-reflection ambient light according to claim 2, characterized in that, The reflective surface (110) is disposed on the inner wall of the outer casing (100).

4. The single-reflection ambient light according to claim 2, characterized in that, It includes a reflective device (300) disposed within the accommodating cavity (140), and a reflective surface (110) disposed on one side of the reflective device (300).

5. The single-reflection ambient light according to claim 4, characterized in that, The reflecting device (300) includes one or more reflectors, one side of which is provided with a reflective surface (110), and the plurality of reflectors are distributed along the length direction of the light outlet (160).

6. The single-reflection ambient light according to claim 1, characterized in that, The light-emitting element carrier plate (220) includes one or more carrier plates, on which one or more light-emitting elements (210) are disposed, and the multiple carrier plates are distributed along the length direction of the light outlet (160).

7. The single-reflection ambient light according to claim 1, characterized in that, The angle between the normal of the light-emitting carrier plate (220) and the normal of the light-emitting part (400) light-inlet side (410) is 60°~120°.

8. The single-reflection ambient light according to claim 1, characterized in that, The major axis of the ellipse containing the elliptical arc segment is at least twice its minor axis.

9. The single-reflection ambient light according to claim 1, characterized in that, The reflective surface (110) is a smooth surface; or the reflective surface (110) is provided with optical patterns; The reflective surface (110) is provided with a reflective metal layer; or the reflective surface (110) is white.

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