Reflector and lamp having same

Abstract

The present application relates to a reflector and a lamp having same. The reflector is mounted on a downlight and is used for reflecting, in a predetermined direction, light emitted by a light source of the downlight. The reflector has: an inlet close to the light source; an outlet farther from the light source than the inlet; and a reflective face extending between the inlet and the outlet in the longitudinal direction of the downlight, wherein the reflective face radially and symmetrically surrounds the light source around the central axis of the downlight, and the reflective face consists of a plurality of independent segmented reflective bodies. In the present application, the reflector can be assembled from separate parts, such that surface-treated reflective surfaces of the reflector have substantially uniform reflective performance, thereby significantly overcoming the defect of uneven light distribution of existing downlights; and then, since the different segmented reflective bodies have mutually different curvatures, light rays of the light source at different emission angles can be substantially consistently reflected by respective corresponding segmented reflective bodies to desired light emission points, thereby improving the light emission efficiency and light mixing performance of downlights.

Description

A reflector and its lamp

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202422657187.4, filed on November 1, 2024, entitled “A Reflector and a Lighting Fixture Thereof”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of lighting technology, and more particularly to a reflector and a lighting fixture thereof. Background Technology

[0004] A reflector is a cup-shaped reflector used for long-distance focused lighting. It utilizes limited light energy to control the illumination distance and area of ​​the main light spot. As a crucial component in secondary optical design, the reflector directly impacts the light quality of LED downlights.

[0005] In typical reflector cups and their surface molding processes, the reflector cup is usually integrally injection molded and then surface-treated. However, because the reflector cup has a cup-like structure with a gradually changing opening, a relatively long longitudinal depth between its bottom and top openings, and different surface treatment areas for the bottom and top openings, the coating or deposition efficiency varies significantly during injection molding and surface treatment processes such as evaporation and sputtering. This results in inconsistent deposition states on the reflective surface of the cup (e.g., uneven thickness of the optical film), leading to inconsistent overall reflective performance and significantly affecting the light output efficiency of LED downlights. Therefore, it is indeed necessary to provide a reflector and its luminaire.

[0006] Furthermore, on the one hand, there are differences in understanding among those skilled in the art; on the other hand, the applicant studied a large number of documents and patents when making this invention, but due to space limitations, not all details and contents were listed in detail. However, this does not mean that the present invention does not possess the features of these prior art. On the contrary, the present invention already possesses all the features of the prior art, and the applicant reserves the right to add relevant prior art to the background art. Summary of the Invention

[0007] In view of the shortcomings of the prior art, this application provides a reflector and a lamp thereof, which aims to solve at least one or more technical problems existing in the prior art.

[0008] To achieve the above objectives, this application provides a reflector mounted on a downlight fixture, the downlight fixture including a light source, the reflector for reflecting light emitted by the light source in a predetermined direction, wherein the reflector has:

[0009] The entrance is near the light source;

[0010] The exit is relatively far from the light source relative to the entrance; and

[0011] A reflective surface extending longitudinally along the downlight fixture between the inlet and outlet, which radially and symmetrically surrounds the light source around the central axis of the downlight fixture;

[0012] The reflective surface is composed of multiple independent reflective segments.

[0013] Preferably, the multiple segment reflectors include multiple first segment reflectors stacked longitudinally along the downlight fixture.

[0014] Preferably, at least two first segment reflectors have different curvatures from each other.

[0015] Preferably, the multiple segment reflectors include multiple second segment reflectors radially distributed around the central axis of the downlight fixture.

[0016] Preferably, multiple reflective segments can be detachably combined using fasteners to form a reflective surface.

[0017] Preferably, the reflector is made of glass.

[0018] Preferably, this application also relates to a luminaire with a reflector, the luminaire comprising:

[0019] The base is equipped with a light source;

[0020] A lens, connected to a base, partially or completely covering the light source; and

[0021] The reflector provided in this application is connected to a base for reflecting light emitted by a light source and transmitted through a lens in a predetermined direction.

[0022] Preferably, this application also relates to another type of luminaire having a reflector, the luminaire comprising:

[0023] The base is equipped with a light source;

[0024] Two reflectors provided in this application are stacked on top of each other for reflecting light emitted by a light source in a predetermined direction;

[0025] A lens is placed between two reflectors to allow light reflected from one reflector to be projected through the lens onto the other reflector.

[0026] This application provides a lamp with a light-emitting device and a reflector. The reflector is used to reflect light emitted by the light-emitting device in a predetermined direction. The reflector has: an inlet close to the light-emitting device; an outlet away from the light-emitting device relative to the inlet; and a reflective surface extending longitudinally along the downlight fixture between the inlet and the outlet. The reflective surface radially and symmetrically surrounds the light-emitting device around the central axis of the downlight fixture, and the reflective surface is composed of a combination of multiple independent segmental reflectors. This design ensures that the reflective surfaces of each segment of the reflector have essentially uniform reflective properties during surface coating treatment. This significantly improves the uneven light distribution characteristic of existing LED downlights when applied to LED downlights. Furthermore, the combination of multiple reflector segments provides a variety of reflectors, allowing designers to flexibly select reflectors with different reflective properties based on the optical performance requirements of the luminaire. In addition, the varying curvatures of the different reflector segments ensure that light rays from different emission angles are consistently reflected to the desired emission point by their respective reflector segments, resulting in excellent light extraction efficiency and light mixing performance for the LED downlights. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 is a cross-sectional view of one of the lamps provided in the embodiments of this application;

[0029] Figure 2 is a schematic diagram of the reflector provided in an embodiment of this application;

[0030] Figure 3 is a structural schematic diagram of the fastener provided in an embodiment of this application;

[0031] Figure 4 is a cross-sectional view of a second lamp provided in an embodiment of this application;

[0032] Figure 5 is an optical path diagram of the light source provided in an embodiment of this application.

[0033] Explanation of reference numerals in the attached drawings: 1. Base; 2. Light source; 3. Lens; 4. Reflector; 4a. Primary reflector; 4b. Secondary reflector; 41. Inlet; 42. Outlet; 43. Reflective surface; 430a. First section reflector; 430b. Second section reflector; 5. Fixing element; 6. Face ring. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this embodiment clearer, the technical solutions of this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this embodiment, not all embodiments. Based on the embodiments in this embodiment, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0035] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and are not used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and are not limited in number; for example, a first object can be one or more.

[0036] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0037] The reflector and its lamp provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0038] As shown in Figures 1 to 3, this application discloses a lamp with a light-emitting device and a reflector. The lamp may include a base 1, a light source 2, a lens 3, and a reflector 4.

[0039] Specifically, referring to Figure 1, a light source 2 is mounted on the bottom surface of the base 1. A lens 3 is connected to the base 1 and partially or completely covers the light source 2, so as to allow the light emitted by the light source 2 to be projected onto the reflector 4 through the lens 3.

[0040] As shown in Figures 4 and 5, this application also discloses another type of lamp with a light-emitting device and a reflector. The lamp may include a base 1, a light source 2, a lens 3, and two reflectors 4.

[0041] Specifically, referring to Figure 4, one reflector 4 is positioned close to the light source 2 and can serve as a primary reflector 4a. The other reflector 4 is positioned away from the light source 2 at the exit position of the primary reflector 4a and can serve as a secondary reflector 4b. A lens 3 is positioned between the two reflectors 4 (i.e., primary reflector 4a and secondary reflector 4b), which allows light reflected from one of the reflectors 4 (such as primary reflector 4a) to be projected through the lens 3 to the other reflector 4 (such as secondary reflector 4b).

[0042] The reflector 4 provided in this application embodiment is particularly suitable for downlight fixtures, wherein the downlight fixture may include a light source 2, such that the reflector 4 can reflect light emitted by the light source 2 in a predetermined direction.

[0043] According to a preferred embodiment, the light source 2 may include one or more LED beads. Preferably, when the light source 2 is designed as a multi-color mixed light source, the light source 2 may be composed of LED beads with different emission wavelengths / colors.

[0044] In this embodiment, the base 1 is a heat dissipation base. Furthermore, a heat dissipation structure is constructed on the side of the base 1 facing away from the light source 2. This heat dissipation structure consists of several heat dissipation fins.

[0045] According to a preferred embodiment, the reflector 4 provided in this application is made of glass. In other embodiments, the reflector 4 may also be made of plastic or other materials commonly used in lamp reflectors, and this application does not limit this to any particular material.

[0046] In this embodiment, the reflector 4 is used to reflect light emitted by the light source 2 in a predetermined direction. Referring to FIG1, the reflector 4 has an inlet 41 close to the light source 2 and an outlet 42 opposite to the inlet 41 and away from the light source 2. A reflective surface 43 is formed between the inlet 41 and the outlet 42 of the reflector 4. The reflective surface 43 extends along the longitudinal direction L of the downlight fixture and radially symmetrically surrounds the light source 2 around the central axis of the downlight fixture. Preferably, the reflective surface 43 expands radially outward around the central axis of the downlight fixture in the direction from the inlet 41 to the outlet 42 of the reflector 4, thus the reflector 4 generally has a cup-shaped structure with a gradually widening opening.

[0047] According to a preferred embodiment, the reflective surface 43 can be configured to be composed of a combination of multiple independent segmental reflectors. In this embodiment, the reflective surface 43 may include, for example, at least two independent segmental reflectors. In other embodiments, the reflective surface 43 may be composed of a different number of segmental reflectors, which typically depends on the application scenario and optical performance requirements of the luminaire. It is understood that the accompanying drawings are merely exemplary disclosures for ease of understanding and illustration and should not be construed as specific limitations on this application.

[0048] In this embodiment of the application, the multiple segment reflectors may include multiple first segment reflectors 430a or multiple second segment reflectors 430b. For example, as shown in FIG2, the multiple segment reflectors may include two first segment reflectors 430a or two second segment reflectors 430b.

[0049] According to a preferred embodiment, when the reflective surface 43 of the reflector 4 is formed by combining multiple (e.g., two) first segment reflectors 430a, the multiple first segment reflectors 430a are arranged in a stacked distribution along the longitudinal direction L of the downlight fixture. Referring to Figure 2, along the longitudinal direction L of the downlight fixture, the reflective surface 43 is composed of multiple independent annular reflective cups cut out with different cross-sections. The diameter or circumference of the multiple annular reflective cups increases or decreases sequentially along the longitudinal direction L of the downlight fixture. It is understood that the more first segment reflectors 430a there are, the smaller the height or longitudinal depth of each first segment reflector 430a becomes. Therefore, when performing surface optical treatment (e.g., evaporation coating, sputtering) on ​​each first segment reflector 430a, the reflective surface of each first segment reflector 430a can be treated substantially uniformly, resulting in nearly identical optical reflection performance among the various first segment reflectors 430a.

[0050] According to a preferred embodiment, when the reflective surface 43 of the reflector 4 is formed by combining a plurality of (e.g., two) second-segment reflectors 430b, the plurality of second-segment reflectors 430b are arranged radially distributed around the central axis of the downlight fixture. Referring to Figure 2, the reflective surface 43 is divided about the central axis of the downlight fixture into a plurality of independent, generally arc-shaped or fan-shaped reflective segments. It is understood that the more second-segment reflectors 430b there are, the closer each second-segment reflector 430b is to a plane. Therefore, when performing surface optical treatment (e.g., evaporation coating, sputtering) on ​​each second-segment reflector 430b, the reflective surface of each second-segment reflector 430b can be treated substantially uniformly, thereby making the optical reflective properties of each second-segment reflector 430b nearly identical.

[0051] Referring to Figures 1 to 3, in this embodiment of the application, multiple segment reflectors can be detachably combined with each other using fasteners 5 to form a reflective surface 43. As shown in Figure 3, the fastener 5 provided in this embodiment of the application is constructed as an annular clamp structure (such as a flange ring). Taking the combination of multiple first segment reflectors 430a as an example, at least two first segment reflectors 430a are combined along the longitudinal direction L of the downlight fixture. The annular clamp fastener 5 is fitted onto the periphery of the reflector 4 from the inlet 41 to the outlet 42, and fixed at the connection point of the two first segment reflectors 430a. Further, the outer periphery of the first segment reflector 430a may be constructed with an annular protrusion, and the inner wall of the fastener 5 is constructed with an annular groove adapted to the annular protrusion to restrict the annular protrusion within the annular groove, thereby connecting and fixing the two first segment reflectors 430a by means of the annular protrusion and the annular groove.

[0052] Furthermore, in the downlight fixture with two-stage reflectors shown in Figures 4 and 5, at least one reflector 4 can be composed of multiple segment reflectors. That is, at least one of the primary reflector 4a and the secondary reflector 4b shown in Figure 4 is composed of at least two segment reflectors. This application does not impose any limitations on this.

[0053] As a further improvement of this application, at least two first segment reflectors 430a may have different curvatures. As shown in Figure 2, the reflective surface 43 is formed by combining two first segment reflectors 430a stacked one on top of the other.

[0054] In this embodiment of the application, the curvature change of the first section reflector 430a located at the bottom along the longitudinal direction L of the downlight fixture can be solved or characterized by the following expression: y = -0.0003x 3 +0.0847x 2 -0.0079x-2.941. Taking Figure 1 as an example, a coordinate system is established with the center of the inlet 41 of the reflector 4 as the origin O. x is the abscissa of any point on the first segment reflector 430a from the origin O, and y is the ordinate of any point on the first segment reflector 430a from the origin O. Further, by taking the first derivative of the above equation and substituting the abscissa x of a point on the first segment reflector 430a into the first derivative, the curvature can be obtained. Therefore, the above equation characterizes the curvature change of the first segment reflector 430a as a whole.

[0055] On the other hand, as shown in Figure 2, the curvature change of the other first segment reflector 430a located above can be solved or characterized by the following expression: y = -0.0002x 3 +0.079x 2+0.1141x-3.81. Understandably, for each first segment reflector 430a, the coefficients in each polynomial expression are usually different depending on the number, position, and size of the divided first segment reflectors 430a.

[0056] In some alternative embodiments, at least two second-segment reflectors 430b may have different curvatures from each other. As shown in FIG2, the reflective surface 43 is formed by combining two second-segment reflectors 430b that are symmetrically arranged on the left and right. In this embodiment, taking the second-segment reflector 430b located on the left as an example, the curvature change of it from the inlet 41 of the reflector 4 to the outlet 42 of the reflector 4 can be solved or characterized by the following expression: y = -0.0002x 3 +0.0805x 2 +0.0624x-3.2794. Furthermore, the second segment reflector 430b located on the right side can have a different curvature. For example, in the direction from the inlet 41 of the reflector 4 to the outlet 42 of the reflector 4, the second segment reflector 430b on the right side has a substantially uniform curvature. Therefore, the reflector 4 composed of these two second segment reflectors 430b can be applied to, for example, downlights with polarized designs.

[0057] It is understood that the description of the curvature changes of the segment reflectors in this application is merely an illustrative example and should not be considered as a specific limitation of this application. In other embodiments, other calculations or expressions may be used to characterize the curvature changes of each segment reflector, which can be designed by the designer according to the optical performance requirements of the reflector 4.

[0058] Referring to Figures 1, 4, and 5, the luminaire provided in this embodiment may further include a face ring 6. The face ring 6 is inserted into the outlet 42 of the reflector 4 and detachably connected to the base 1. As an example, the face ring 6 and the base 1 may be rotatably connected by a threaded structure, for example.

[0059] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0060] Finally, it should be noted that this application specification and its accompanying drawings are illustrative and not intended to limit the scope of the claims. Although the embodiments have been described in detail with reference to the foregoing examples, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application. This application specification contains multiple inventive concepts, and phrases such as "preferredly," "according to a preferred embodiment," or "optionally" indicate that the corresponding paragraph discloses an independent concept. The applicant reserves the right to file divisional applications based on each inventive concept.

Claims

1. A reflector mounted on a downlight fixture, the downlight fixture comprising a light source (2), the reflector (4) for reflecting light emitted by the light source (2) in a predetermined direction, wherein, The reflector (4) has: The entrance (41) is located near the light source (2); The outlet (42) is located away from the light source (2) relative to the inlet (41); and A reflective surface (43) extending along the longitudinal direction (L) of the downlight between the inlet (41) and the outlet (42) symmetrically surrounds the light source (2) radially around the central axis of the downlight. The reflective surface (43) is composed of multiple independent reflective segments.

2. The reflector according to claim 1, wherein, The plurality of segment reflectors include a plurality of first segment reflectors (430a) stacked along the longitudinal direction (L) of the downlight fixture.

3. The reflector according to claim 2, wherein, At least two of the first segment reflectors (430a) have different curvatures from each other.

4. The reflector according to claim 1, wherein, The plurality of segment reflectors includes a plurality of second segment reflectors (430b) radially distributed around the central axis of the downlight fixture.

5. The reflector according to claim 1, wherein, The plurality of segmental reflectors can be detachably combined by means of a fastener (5) to form the reflective surface (43).

6. The reflector according to any one of claims 1 to 5, wherein, The reflector is made of glass.

7. A lamp, wherein, include: The base (1) is equipped with a light source (2); A lens (3) is connected to the base (1) and covers the light source (2); as well as The reflector (4) as described in any one of claims 1 to 6 is connected to the base (1) for reflecting light emitted by the light source (2) and transmitted through the lens (3) in a predetermined direction.

8. A lamp, wherein, include: The base (1) is equipped with a light source (2); Two reflectors (4) as described in any one of claims 1 to 6, the two reflectors (4) being stacked on top of each other for reflecting light emitted by the light source (2) in a predetermined direction; A lens (3) is disposed between the two reflectors (4) to allow light reflected from one of the reflectors (4) to be projected through the lens (3) to the other reflector (4).

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