CN220397370U

CN220397370U - LED lamp panel

Info

Publication number: CN220397370U
Application number: CN202322043267.6U
Authority: CN
Inventors: 张姜; 马月明; 汪丽平; 王瑞阳
Original assignee: Signify Holding BV
Current assignee: Signify Holding BV
Priority date: 2023-07-31
Filing date: 2023-07-31
Publication date: 2024-01-26
Anticipated expiration: 2033-07-31

Abstract

An LED lamp panel includes a housing having a rectangular light exit window, including an arched reflector and a light source assembly mounted on the housing across the rectangular light exit window. The light source assembly includes a light guide plate having a first major surface and a second major surface, and four sides extending between the two major surfaces, wherein two opposing sides are directly or indirectly coupled to the housing, the first major surface facing the arched reflector; the LED light source is arranged at the side edge of the light guide plate; and a reflecting sheet disposed between the light guide plate and the arched reflector and covering the first main surface of the light guide plate; the reflection sheet has a transmission portion. In the working state, the light source component directly projects outside the LED lamp panel through the second main surface, projects to the arched reflector through the transmission part of the reflecting sheet, and reflects at least part of light rays out of the rectangular light outlet window through the arched reflector.

Description

LED lamp panel

Technical Field

The present disclosure relates to LED lamp panels, and more particularly to an embedded mounted trough LED lamp panel that replaces conventional grille lamps.

Background

With the development of LED technology, many groove-type LED lamp panels or panel lamps have been used to replace the conventional embedded-type grille fluorescent lamps. The industry classifies these products into direct and indirect lighting fixtures according to the path of travel of the light.

The panel lamp generally adopts an LED light source with a light guide plate matched with a side edge, the thickness of the lamp body is thinner, and the thickness of the lamp with the area of 600mm is generally about 20-30 mm. The light rays are directly emitted from the light emitting surface of the lamp, the light distribution of the emitted light is close to Lambertian (Lambertian) distribution, and the glare degree is high. We refer to such fixtures as direct-lit fixtures.

The indirect luminous groove type LED lamp panel is provided with one or more arched or conical reflecting covers, the LED light source emits light towards the reflecting covers, and the light leaves the lamp panel after being reflected by the reflecting covers. The lamp is characterized in that the surface of the reflector is a diffusion surface, light beams are emitted after being diffusely reflected by the reflection surface, the visual effect of human eyes is more comfortable, but UGR value is not low. Meanwhile, because the optical cavity is lengthened by the reflection path, the thickness of the lamp is large, the thickness of the lamp with the area of 600mm is about 140-160mm, and the installation is difficult, so that the application of the lamp is limited.

Some have attempted to combine the two, but the ratio of direct and indirect luminescence is difficult to control, either the light distribution is not uniform or the glare index is not high, e.g. UGR (Unified Glare Rating, unified glare value) is difficult to reach 19.

Therefore, it would be welcomed by users to develop LED lamp panels with thinner lamp bodies and strong anti-glare capabilities.

Disclosure of Invention

The present disclosure seeks to provide an LED light panel comprising, a housing having a rectangular light exit window comprising an arched reflector; and a light source assembly mounted on the housing across the rectangular light exit window. The light source assembly includes: a light guide plate having a first major surface and a second major surface, and four sides extending between the first and second major surfaces, wherein two opposing sides are directly or indirectly coupled to the housing, the first major surface facing the arched reflector; an LED light source disposed on at least one side of the light guide plate, light emitted from the LED light source being coupled into the light guide plate in an operating state; and a reflecting sheet disposed between the light guide plate and the arched reflector and covering the first main surface of the light guide plate. The reflector plate is provided with a transmission part, so that in a working state, the light source assembly directly projects a first part of light outside the LED lamp panel through the second main surface, projects a second part of light to the arched reflector through the transmission part of the reflector plate, and reflects at least a part of the second part of light out of the rectangular light-emitting window through the arched reflector. The LED lamp panel has direct and indirect light emission, and can properly reduce the depth of the light mixing cavity, so that the overall thickness of the lamp is thinner.

Preferably, one of the first and second main surfaces of the light guide plate is provided with dots to break the total internal reflection condition of the first and second main surfaces so that light is projected out of the light guide plate. These dots with scattering and diffuse reflection effects can be printed or etched on the surface of the light guide plate. In some cases, the light beam traveling in the light guide plate may be extracted, or may be scattered particles or bubbles embedded in the light guide plate. These can be categorized as light extraction features (light extraction features).

Preferably, the light guide plate is in a shape of an elongated plate, and both sides of both ends thereof are coupled with the housing. Further, one or both of the other two sides of the light guide plate are coupled with the LED light source. The second main surface of the light guide plate may be further covered with an antiglare member. The light guide plate, the reflection sheet and the anti-dazzle assembly can be clamped between the face frame and the pressing strip and fixed by a fastener to form the light source assembly. The surface of the anti-dazzle component is provided with a microstructure film with a prism structure or a micro-pyramid structure so as to moderately deflect the light passing through the anti-dazzle component in the advancing direction.

In some embodiments, the reflective sheet is made of a reflective material as a whole, and the transmissive portion thereof is a through hole; in other embodiments, the reflective sheet is entirely made of a transmissive material, with a reflective layer coated or attached to the surface, and the transmissive portion is a portion where the reflective layer is not coated or attached.

Preferably, the area of the transmitting part accounts for 30-60% of the total area of the reflecting sheet. The anti-dazzle performance of the LED lamp panel obtained in the range is high. In a sample with a transmission of 45%, a UGR value of less than 19 was measured. Therefore, the reflecting sheet with the transmission part provides a new variable for lamp design, namely, the proportion of direct and indirect light emission of the whole lamp can be correspondingly changed by changing the proportion of the transmission part to the light guide plate and adjusting the proportion of upward and downward light emission, so that the best compromise scheme is obtained.

The LED lamp panel may further comprise a driver for powering the light source.

Drawings

The above and other objects, features and advantages of embodiments of the present disclosure will become more readily apparent from the following detailed description with reference to the accompanying drawings. Embodiments of the present disclosure will now be described, by way of example and not limitation, in the figures of the accompanying drawings and in which:

FIG. 1 is a schematic view of an LED lamp panel according to the present disclosure;

FIG. 2 is a cross-sectional view of the LED lamp panel of FIG. 1;

FIG. 3 is an exploded view of the LED lamp panel of FIG. 1;

FIG. 4 is an enlarged view of FIG. 2 at A;

FIG. 5 is a schematic view of the optical path of the present disclosure; and

fig. 6 illustrates the output light distribution of the LED lamp panel of the present disclosure.

Detailed Description

The principles of the present disclosure will now be described with reference to various exemplary embodiments shown in the drawings. It should be understood that these embodiments are merely provided to enable those skilled in the art to better understand and further practice the present disclosure and are not intended to limit the scope of the present disclosure in any way. It should be noted that similar or identical reference numerals may be used, where possible, in the figures and similar or identical reference numerals may designate similar or identical functions. Those skilled in the art will readily recognize from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.

As used herein, the term "comprising" and variations thereof may be understood as open-ended terms, which mean "including, but not limited to. The term "based on" may be understood as "based at least in part on". The term "one embodiment" may be understood as "at least one embodiment". The term "another embodiment" may be understood as "at least one other embodiment".

In the description of embodiments of the present utility model, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Unless specifically stated or limited otherwise, the terms "connected," "coupled," and the like should be construed broadly, and may be, for example, fixedly coupled, detachably coupled, or integrally formed; can be mechanically coupled or electrically coupled; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Referring to fig. 1, an LED lamp panel of the present disclosure includes a generally rectangular housing 10, the main portion of which is an arched reflector 15, the housing 10 having a rectangular light exit window across which a light source assembly 1 is mounted. An actuator 20 is attached to the outside or back of the housing 10. The visible light source assembly 1 effectively partially obscures this rectangular light exit window, leaving two blank portions.

In the cross-sectional view shown in fig. 2, light rays Ld directly emitted from the lower surface of the light source module 1 are indicated by two-dot chain arrows, and light rays Li indirectly emitted from the blank portions on both sides of the light source module 1 after being reflected after being projected from the upper surface of the light source module 1 to the arch reflector 15 are indicated by dashed arrows. The light rays Ld and Li together constitute the outgoing light from the LED lamp panel of the present disclosure.

In the exploded view of fig. 3, it can be seen that the light source module 1 includes an antiglare module 11, a light guide plate 12, and a reflecting sheet 13, which are stacked in this order from bottom to top, and they are sandwiched between a face frame 14 and a bead 18 and fixed by fasteners 17 (e.g., screws, rivets). The LED light sources 16 are LED chips mounted on a strip-shaped PCB in a linear arrangement, and are disposed on one side or both sides (both sides in the drawing) of the light guide plate 12. Wherein the antiglare component 11 is a microstructured film having a prismatic structure or a microprism structure on the surface. The light passing through the antiglare assembly 11 is deflected to some extent by an angle that reduces glare directly into the observer's eye, thereby reducing the degree of glare. The transmissive portions 131 of the reflector 13 are also shown, for example uniformly distributed openings. Of course, the distribution of the transmissive portions 131 on the reflective sheet 13 may be non-uniform, such as denser at a distance from the light source and sparser at a distance from the light source, to compensate for the uniformity of the light output caused by the optical path.

The reflection sheet 13 may be integrally formed of a reflective material such as a reflective paper or a metal foil, through which a through hole is perforated to form the transmissive portion 131. The reflecting sheet 13 may be made of a transmissive material, such as a polyester sheet, coated with a coating such as titanium dioxide, or deposited or attached with a metal reflecting layer, and the partially hollowed surface may form the transmissive portion 131.

See fig. 4, which is an enlarged view of a portion a of fig. 2. The LED light source 16 is coupled to the side of the light guide plate 12, and the screws 17 press the pressing strips 18 onto the face frame 14 to clamp the antiglare component 11, the light guide plate 12 and the reflecting sheet 13.

Fig. 5 illustrates a partial light path of the present disclosure using a simplified drawing. The upper and lower surfaces of the light guide plate 12 are defined as a first main surface 121 and a second main surface 122, and four sides are denoted as 124. Light exiting the LED light source 16 is coupled into the light guide plate 12 from the side 124 and is directed forward by total internal reflection from the first and second major surfaces 121 and 122. At the dots 126 on one major surface, total internal reflection is destroyed and light can exit the light guide plate 12 either upward or downward. The downward light becomes light Ld directly emitted from the lower surface. Some of the upward light is reflected by the reflecting portion of the reflecting sheet 13 to become downward direct outgoing light Ld, or continues to be transmitted forward along the light guide plate 12 according to total internal reflection, and some of the upward light passes through the transmitting portion 131 to be projected onto the surface of the arched reflector 15 to become indirect outgoing light Li.

Figure 6 shows the output light distribution of one LED lamp panel sample of the present disclosure with an FHMW of 87.6 ° at C0-180 ° and 76.4 ° at C90-270 °. The light pattern is similar to the Delta light pattern, and under the condition of similar angles, the distribution illuminated surface is more uniform and the glare is lower. The area of the transmission part accounts for 45% of the total area of the reflector plate, the area of the lamp is 600mm, the total lumen output is 4000lm, UGR is measured to be 18.9, and the total thickness of the lamp is only 70mm.

While certain specific embodiments of the present disclosure have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are intended to be illustrative only and are not limiting on the scope of the present disclosure. It will be appreciated by those skilled in the art that modifications may be made to the embodiments described above without departing from the scope and spirit of the disclosure. The scope of the present disclosure is defined by the appended claims. In the description and in the claims that follow, unless the context requires otherwise, the terms "comprise" and "comprise" are to be construed as comprising the illustrated component or ingredients, but not excluding any other components or ingredients. The reference to any prior art in this specification is not, and should not be taken as, an acknowledgment or any form of suggestion that such prior art forms part of the common general knowledge.

Claims

1. An LED lamp panel, comprising:

a housing (10) having a rectangular light exit window, comprising an arched reflector (15); and a light source assembly (1) mounted on the housing (10) across the rectangular light exit window; the light source assembly (1) comprises:

a light guide plate (12) having a first main surface (121) and a second main surface (122), and four sides (124) extending between the first main surface and the second main surface, wherein two opposite sides (124) are directly or indirectly coupled to the housing (10), the first main surface (121) facing the arched reflector (15);

an LED light source (16) disposed on at least one side of the light guide plate (12), light emitted from the LED light source (16) being coupled into the light guide plate (12) in an operating state; and

a reflection sheet (13) which is provided between the light guide plate (12) and the arch-shaped reflector (15) and which covers the first main surface (121) of the light guide plate (12); the reflector plate (13) is provided with a transmission part (131), so that in an operating state, the light source assembly (1) directly projects a first part of light to the outside of the LED lamp panel through the second main surface (122), and also projects a second part of light to the arched reflector (15) through the transmission part (131) of the reflector plate (13), and at least one part of the second part of light is reflected out of the rectangular light outlet window through the arched reflector (15).

2. The LED lamp panel according to claim 1, wherein one of the first main surface (121) and the second main surface (122) of the light guide plate (12) is provided with dots (126).

3. The LED lamp panel according to claim 1, wherein the light guide plate (12) has an elongated plate shape, and both sides (124) of both ends thereof are coupled to the housing (10).

4. A LED lamp panel according to claim 3, characterized in that one or both of the other two sides (124) of the light guide plate (12) is coupled to the LED light source (16).

5. The LED lamp panel according to claim 4, characterized in that the second main surface (122) of the light guide plate (12) is further covered with an antiglare component (11).

6. The LED lamp panel according to claim 5, wherein the light guide plate (12), the reflecting sheet (13) and the antiglare assembly (11) are sandwiched between a face frame (14) and a bead (18) and fixed by a fastener (17) to constitute the light source assembly (1).

7. The LED lamp panel according to claim 1, characterized in that the reflective sheet (13) is integrally made of a reflective material, and the transmissive portion (131) thereof is a through hole.

8. The LED lamp strip according to claim 1, characterized in that the reflector sheet (13) is entirely made of a transmissive material, with a reflective layer coated or attached to the surface, and the transmissive portion (131) is a portion to which the reflective layer is not coated or attached.

9. The LED lamp panel according to claim 1, characterized in that the area of the transmissive portion (131) is 30-60% of the total area of the reflective sheet (13).

10. The LED lamp panel according to claim 1, further comprising a driver (20).