CN215061875U - Direct type panel lamp with uniform light emission - Google Patents

Abstract

The application discloses a direct type panel lamp capable of emitting light uniformly, which comprises a frame, a diffusion plate, a back plate and at least one lamp bar; the central area of the back plate is raised to form a cavity for accommodating the lamp strips, the cavity comprises a flat bottom wall and inclined side walls, and each lamp strip is fixed on the bottom wall; the diffusion plate is arranged opposite to the back plate to seal the cavity; the frame is formed by splicing a plurality of frame strips, and each frame strip is connected with the diffusion plate and the corresponding edge of the back plate; the single light bar comprises a substrate and a plurality of LED light beads arranged on the substrate, the LED light beads are sequentially arranged along the length direction of the light bar, the distance between every two adjacent LED light beads at the two end parts of the light bar is L1, the distance between every two other adjacent LED light beads is L2, and the L1 is smaller than L2; this scheme is for prior art, through the luminance of strengthening lamp strip both ends to the luminous approximate even of each region that makes straight following formula panel light, the darker problem of partial region appears in the panel light of avoiding straight following formula.

Description

Direct type panel lamp with uniform light emission

Technical Field

The application relates to a panel light field especially relates to a luminous even straight following formula panel light.

Background

The LED panel lamp has the advantages of good illumination uniformity, soft and comfortable light, environment-friendly materials, low power consumption and the like, and is a popular indoor lighting lamp at present.

The basic structure of the panel lamp comprises a frame, a back plate, a diffusion plate, a driving power supply and a plurality of light-emitting assemblies, wherein the back plate is installed on the back face of the frame, the diffusion plate is installed on the front face of the frame, the light-emitting assemblies are arranged between the back plate and the diffusion plate and installed on the lower surface of the back plate, and the driving power supply is installed on one side, back to the lamp body assemblies, of the back plate. The light emitting component forms a uniform plane light emitting effect after passing through the diffusion plate with high light transmittance, and the driving power supply is used for driving the light emitting element.

The plurality of light emitting components are in a strip structure and are arranged in parallel, so that the brightness in the middle of the panel lamp is higher than the brightness around the panel lamp, and the visual effect is influenced.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problem, the present application provides a direct type panel light that is uniform in light emission, including:

the LED lamp strip comprises a base plate and a plurality of LED lamp beads arranged on the base plate, the LED lamp beads are sequentially arranged along the length direction of the lamp strip, the distance between two adjacent LED lamp beads at two ends of the lamp strip is L1, the distance between the other two adjacent LED lamp beads is L2, and L1 is smaller than L2;

the central area of the back plate is raised to form a cavity for accommodating the light bars, the cavity comprises a flat bottom wall and inclined side walls, and each light bar is fixed on the bottom wall;

the diffusion plate has a light transmission function and is arranged opposite to the back plate to seal the cavity;

the frame is formed by splicing a plurality of frame strips, and each frame strip is connected with the diffusion plate and the corresponding edge of the back plate.

Several alternatives are provided below, but not as an additional limitation to the above general solution, but merely as a further addition or preference, each alternative being combinable individually for the above general solution or among several alternatives without technical or logical contradictions.

Optionally, the direct type panel lamp further comprises reflective paper, the reflective paper comprises a central area and a folded edge extending along the length direction of the central area, the central area of the reflective paper is attached to the bottom wall, and the folded edge is attached to the side wall.

Optionally, a hollow-out area is formed in the central position of the reflective paper, which is close to the central area.

Optionally, along the length direction of the light bar, two opposite edges of the hollow area are close to the corresponding end portions of the light bar;

along the width direction of the light bars, the two opposite edges of the hollow area are close to the middle position of the two adjacent light bars.

Optionally, the reflective paper includes a first reflective paper and a second reflective paper arranged along the width direction of the light bar, and at least one light bar is located between the first reflective paper and the second reflective paper.

Optionally, the substrate is located between the reflective paper and the back plate, the reflective paper is provided with avoiding holes for avoiding the LED lamp beads.

Alternatively, L1: l2 ═ (0.5 to 0.7): 1.

optionally, for a single light bar, each LED light bead is symmetrically distributed on both sides of the middle of the light bar.

Optionally, all the light bars are connected in parallel through a conductive bar, and the conductive bar is connected with each light bar in a welding manner;

the conductive strips are perpendicularly intersected with all the light bars and press all the light bars.

Optionally, the backplate has the sunken of matrix distribution, the lamp strip sets up between two rows of sunken.

This application is through the luminance of strengthening lamp strip both ends to the luminous approximate even of each region that makes straight following formula panel light, the darker problem of partial region appears in the panel light of avoiding straight following formula.

Drawings

Fig. 1 is a schematic structural diagram of a direct type panel lamp according to an embodiment of the present disclosure;

FIG. 2 is an exploded view of the direct type panel lamp of FIG. 1;

FIG. 3 is a schematic structural view of a reflective paper and a light bar;

fig. 4 is a schematic structural view of the light bars and the conductive bars in fig. 3;

FIG. 5 is a schematic structural view of the LED lamp bead and the lens in FIG. 3;

FIG. 6 is a schematic structural diagram of the circuit board of FIG. 3;

FIG. 7 is a schematic diagram of a conductive strip structure in FIG. 3;

FIG. 8 is a partial structural view of the frame strip of FIG. 1 without one side;

FIG. 9 is a schematic view of the frame strip of FIG. 8;

FIG. 10 is a partial schematic view of the direct type panel lamp of FIG. 1;

fig. 11 is a schematic structural diagram of the back plate in fig. 1.

The reference numerals in the figures are illustrated as follows:

100. a direct type panel lamp;

10. a light bar; 11. a substrate; 111. a first metal layer; 112. a first insulating layer; 113. a first circuit layer; 114. a second window; 12. LED lamp beads; 13. a lens; 131. a convex foot; 14. a conductive strip; 141. a second insulating layer; 142. a second circuit layer; 143. a second solder resist layer; 144. a first window;

20. a back plate; 21. an edge region; 22. a central region; 23. a bottom wall; 24. a side wall; 25. a rib is protruded; 26. a protrusion; 27. recessing; 28. a cavity;

30. a diffusion plate;

40. a frame; 41. a frame strip; 42. a first mounting surface; 43. a second mounting surface; 44. a horizontal portion; 45. a vertical portion; 46. thickening the portion; 47. vertically folding; 471. a screw slot;

50. reflective paper; 51. a central region; 52. folding edges; 53. repairing the hole; 54. a first reflective paper; 55. a second reflective paper;

60. and driving the cartridge.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1 to 11, the present application provides a direct type panel lamp 100, which includes a frame 40, a back plate 20, a diffusion plate 30 and at least one light bar 10, wherein the back plate 20 is installed on a back surface of the frame 40, the diffusion plate 30 is installed on a front surface of the frame 40, and a light emitting element is disposed between the back plate 20 and the diffusion plate 30 and installed on a lower surface of the back plate 20.

The central area of the back panel 20 is raised to form a cavity 28 for accommodating the light bars 10, the cavity 28 includes a flat bottom wall 23 and an inclined side wall 24, each light bar 10 is fixed on the bottom wall 23, the diffuser panel 30 is disposed opposite to the back panel 20 to close the cavity 28, the frame 40 is formed by splicing a plurality of (usually four) side frame strips 41, and each side frame strip 41 is connected to the diffuser panel 30 and the corresponding edge of the back panel 20.

Each lamp strip 10 is the strip structure and arranges in parallel, and single lamp strip 10 includes base plate 11 and a plurality of LED lamp pearl 12 of installing in base plate 11, and LED lamp pearl 12 is the matrix distribution in backplate 20 inboard for light source evenly distributed. The light bar 10 further comprises a lens 13 covering the LED lamp beads 12, the diffusion plate 30 has a light transmission function, light emitted by the LED lamp beads 12 sequentially penetrates through the lens 13 and the diffusion plate 30, and a plurality of LED point light sources form an even area light source after the light is diffused.

Since the light bars 10 are all in a strip structure and arranged in parallel, the brightness in the middle of the direct type panel light 100 is higher than the brightness around the direct type panel light, which causes uneven lighting of the direct type panel light 100. In order to solve the technical problem, in this embodiment, as shown in fig. 3, each LED lamp bead 12 is sequentially arranged along the length direction of the lamp strip 10, the distance between two adjacent LED lamp beads 12 located at two end portions of the lamp strip 10 is L1, the distance between the other two adjacent LED lamp beads 12 is L2, and L1 is smaller than L2. By enhancing the brightness of the two end portions of the light bar 10, the light emission of each area of the direct type panel light 100 is substantially uniform, and the problem that the partial area of the direct type panel light 100 is darker is avoided.

In the present embodiment, L1: l2 ═ (0.5 to 0.7): 1. preferably, L1: l2 ═ 0.6: 1. in this embodiment, for the same light bar 10, the distance between two adjacent LED lamp beads 12 located at two end portions of the light bar 10 is 58.6mm, and the distance between two adjacent LED lamp beads 12 is 88 mm. The uniformity of the direct type panel lamp 100 reaches over 73%, and the light effect is 109 lm/w.

In the present embodiment, for a single light bar 10, the LED beads 12 are symmetrically distributed on two sides of the middle of the light bar 10. When the light bars 10 are arranged in parallel, the LED beads 12 on the light bars 10 are aligned.

In this embodiment, as shown in fig. 3, the direct type panel light 100 further includes a reflective paper 50, the reflective paper 50 includes a central area 51 and a flange 52 extending along a side length of the central area 51, the central area 51 of the reflective paper 50 is attached to the bottom wall 23, and the flange 52 is attached to the side wall 24. The reflective paper 50 can reflect light emitted from each light bar 10, and the reflective paper 50 needs to cover each inner wall of the cavity 28, so that the direct type panel light 100 can emit light uniformly.

The central area 51 of the reflective paper 50 is rectangular, the number of the folded edges 52 is four, each folded edge 52 is respectively arranged on the corresponding side of the central area 51, the central area 51 covers the bottom wall 23 of the back plate 20, each folded edge 52 covers the side wall 24 corresponding to the back plate 20, and the central area 51 and the folded edge 52 of the reflective paper 50 are fixed on the back plate 20 in an adhesive manner. In some embodiments, the width of the edge 52 is uniform or slightly smaller relative to the width of the sidewall 24, so that the edge 52 covers the corresponding sidewall 24 as much as possible, and the edge 52 is prevented from being wrinkled to cause unevenness of the reflective paper 50.

In the installation position of the reflective paper 50, referring to one embodiment, the substrate 11 is located between the reflective paper 50 and the back plate 20, and the reflective paper 50 is provided with an avoiding hole avoiding the LED lamp bead 12. The reflective paper 50 can shield the substrate 11 of the light bar 10 to prevent shadows from being generated on the substrate 11 and affecting the light emission of the direct type panel light 100.

In order to further reduce the light intensity at the middle position of the direct type panel light 100, referring to one embodiment, the reflective paper 50 has a hollow area at the center position adjacent to the central area 51.

In the specific arrangement of the hollow-out area, referring to one embodiment, along the length direction of the light bar, two opposite edges of the hollow-out area are close to the corresponding end parts of the light bar 10; along the width direction of lamp strip, the double-phase opposite side edge in fretwork district is close to the intermediate position of two adjacent lamp strips 10. In this embodiment, at least one light bar 10 is located in the hollow area. In this embodiment, the two light bars 10 are located in the hollow area.

In other embodiments, the reflective paper 50 includes a first reflective paper 54 and a second reflective paper 55 arranged along the width direction of the light bar, and at least one light bar 10 is located between the first reflective paper 54 and the second reflective paper 55. In this embodiment, the two light bars 10 are located between the first reflective paper 54 and the second reflective paper 55.

In some embodiments, as shown in fig. 4 to 7, all the light bars 10 are connected in parallel by a conductive strip 14, and the conductive strip 14 is connected to each light bar 10 by welding; the conductive strips 14 are pressed on all the light bars 10 and perpendicularly intersect with all the light bars 10. Wherein, each lamp strip 10 all is vertical interval arrangement, and conducting strip 14 all is horizontal arranging.

In order to realize the electrical connection between the conductive strips 14 and the light bar 10, the edge of the conductive strip 14 has a first window 144, the substrate 11 has a second window 114 at a position close to the conductive strip 14, and pads are disposed at the two windows, which are electrically connected by soldering.

In the position where the reflective paper 50 does not cover the conductive bars 14 and the substrate 11, the direct type panel light 100 may have a dark problem in the position area. In order to solve the technical problem, in the present embodiment, at least the portions of the substrate 11 and/or the conductive strips 14 located in the hollow areas are coated with the reflective coating; or the portions of both the substrate 11 and/or the conductive strips 14 between the first reflective paper 54 and the second reflective paper 55 are coated with a reflective coating. The light reflecting coating may be various metal paints including epoxy, UV resin, etc. In some embodiments, both substrate 11 and/or conductive strips 14 are coated with a reflective coating.

The substrate 11 can be a metal substrate 11, preferably an aluminum substrate 11, or an FR-4 glass fiber board. In some embodiments, the substrate 11 may be fixed to the lower surface of the back plate 20 by screws, preferably by thermal adhesive bonding.

As shown in fig. 5 to 6, in some embodiments, the substrate 11 includes a first metal layer 111, a first insulating layer 112 and a first circuit layer 113, and the LED lamp bead 12 is soldered on the first circuit layer 113. A pad for soldering the LED lamp bead 12 is generally disposed on the first circuit layer 113. In order to provide protection for the first circuit layer 113, the surface of the substrate 11 is coated with white solder resist ink to form a first solder resist layer, while leaving a window at the pad to expose the pad for soldering the LED lamp bead 12.

The lens 13 on the light bar 10 is mainly used for light diffusion, the lens 13 is fixed on the substrate 11 through epoxy glue or UV glue, for convenience of installation, the back of the lens 13 is provided with a convex foot 131, and the corresponding substrate 11 is provided with a positioning hole matched with the convex foot 131. The light spot projected on the diffusion plate 30 after passing through the lens 13 is circular, in order to make the light diffusion uniform, the light spot should be spread over the whole diffusion plate 30, the diameter D of the light spot is not less than the distance between two diagonal LED lamp beads 12, because the intensity of the light spot is large in the middle and small in the edge, the adjacent light spots have partial overlap, so that the light intensity of each position of the diffusion plate 30 is substantially uniform.

The conductive strip 14 is a strip structure including a second insulating layer 141, a second circuit layer 142, and a second solder resist layer 143, wherein the second insulating layer 141 is made of an insulating resin material, and the second solder resist layer 143 is formed of white solder resist ink coated on a surface.

In order to facilitate the maintenance between the conductive strips 14 and the light strips 10, referring to one embodiment, as shown in fig. 3, a plurality of repairing holes 53 are formed in a central area 51 of the reflective paper 50, the joints of the light strips 10 and the conductive strips 14 are respectively in one-to-one correspondence with the corresponding repairing holes 53, and the repairing holes 53 can facilitate the maintenance of the joints of the conductive strips 14 and the light strips 10. In some embodiments, the rework holes 53 communicate with adjacent relief holes.

In some embodiments, the strips of the rim 40 are made of metal section (e.g., aluminum alloy), and the ends of adjacent strips of the rim 40 are welded. Of course, 40 frames can also be made of a polymer material by injection molding, and since the polymer material cannot be welded, corner pieces for connecting 40 adjacent frames are generally required to be arranged at corners of the frames 40, or the 40 adjacent frames are connected by lap joints, but the flatness of the frames 40 is poor compared with the welding process.

In some embodiments, as shown in fig. 8 and 9, the cross section of the frame 40 is an L-shaped structure, and includes a horizontal portion 44 and a vertical portion 45, the edge of the diffuser plate 30 and the edge of the back plate 20 are overlapped on the horizontal portion 44, and the vertical portion 45 encloses a limited space for shielding the mounting structure of the edge of the back plate 20, so as to achieve decoration and certain protection.

In some embodiments, in order to increase the strength of the profile, the thickness of the inner side of the corner of the frame 40 is increased to form a thickened portion 46, so that a step structure is formed on the horizontal portion 44 to form a first mounting surface 42 and a second mounting surface 43 on the step structure and the horizontal portion 44, the edge of the diffuser plate 30 is overlapped on the lower first mounting surface 42, and the edge region 21 of the back plate 20 is overlapped on the upper second mounting surface 43 and is fixed by fastening screws. To save material, in some embodiments, thickened portion 46 is a hollow structure.

To facilitate placement of the light bar 10, in some embodiments, as shown in fig. 10 and 11, the back plate 20 has a matrix of recesses 27, and the light bar 10 is disposed between two rows of recesses 27. In order to facilitate the processing of the recess 27 on the back plate 20, the back plate 20 is stamped to form a plurality of protrusions 26 facing away from the cavity 28, the recesses 27 are formed between adjacent protrusions 26, the light bars 10 are arranged in parallel, therefore, the protrusions 26 should also be arranged in parallel, and the gaps between adjacent protrusions 26 are used for mounting the light bars 10, so that the light bars 10 are generally in a straight strip structure.

From the standpoint of processing and heat dissipation, the backplate 20 is stamped from a sheet metal material (e.g., ST13) to form a domed, cage-like structure that includes a central region 22 (e.g., bottom wall 23) and an edge region 21 (e.g., side wall 24) disposed peripherally about the central region 22. Edge region 21 overlaps border 40 and light bar 10 is disposed on the lower surface of central region 22.

The edge region 21 of the back plate 20 is deformed by itself to form a rib 25 extending along the side length direction of the back plate 20, so as to increase the structural strength of the edge region 21, and in some embodiments, in order to reduce the processing difficulty of the rib 25, the edge region 21 is bent by itself to form the rib 25. The deformation is carried out by conventional processing methods such as mechanical punching.

The rib 25 abuts against the edge of the diffuser plate 30 to make the diffuser plate abut against the first mounting surface 42, and because the back plate 20 has a certain elasticity, when the rib 25 abuts against the diffuser plate 30 tightly, the rib 25 can be elastically deformed, so that the rib 25 applies pressure to the diffuser plate 30, the rib 25 and the first mounting surface 42 cooperate with each other to clamp the edge of the diffuser plate 30, so as to prevent the edge of the diffuser plate 30 from being bent, and thus prevent the central portion of the diffuser plate 30 (the geometric center of the diffuser plate 30 or the geometric center close to the diffuser plate 30) from collapsing downwards.

In some embodiments, the bottom wall 23 and the diffuser 30 are disposed in parallel, the light bar 10 is fixed on the bottom wall 23, and the side wall 24 is engaged between the rib 25 and the bottom wall 23. In some embodiments, the portion of the edge region 21 overlapping the frame 40 is parallel to the bottom wall 23, and the bottom wall 23 is higher than the edge region 21. When the direct type panel lamp 100 is installed on a ceiling, the bottom wall 23 is horizontally disposed, and the portion of the corresponding edge area 21 overlapping the frame 40 is also horizontally disposed.

In some embodiments, the edge region 21 of the back plate 20 is fixed to the frame 40 by fastening screws, and the frame 40 is provided with screw grooves 471 arranged along the length direction thereof. In some embodiments, the horizontal portion 44 has a vertical fold 47 in the middle of its upper surface, the gap between the vertical fold 47 and the step structure forms the screw slot 471, and the top surface of the vertical fold 47 supports the edge region 21.

In order to enable the direct type panel light 100 to work normally, in one embodiment, as shown in fig. 1, a driving module is disposed on the direct type panel light 100, and the light bar 10 is electrically connected to the driving module through a wire. In order to facilitate fixing and protecting the driving module, in the present embodiment, the direct type panel lamp 100 further includes a driving cassette 60, and the driving module is mounted in the driving cassette 60, thereby facilitating fixing and protecting the driving module, and simultaneously simplifying the steps of repairing or replacing the driving module, thereby reducing the expenditure of time and labor costs. The conductive strips 14 are electrically connected to the driving module in the driving box 60 through conductive wires, so that the back plate 20 is further provided with wire passing holes for the conductive wires to pass through.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features. When technical features in different embodiments are represented in the same drawing, it can be seen that the drawing also discloses a combination of the embodiments concerned.

The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application.

Claims (10)

1. Luminous even straight following formula panel light, its characterized in that includes:

the LED lamp strip comprises a base plate and a plurality of LED lamp beads arranged on the base plate, the LED lamp beads are sequentially arranged along the length direction of the lamp strip, the distance between two adjacent LED lamp beads at two ends of the lamp strip is L1, the distance between the other two adjacent LED lamp beads is L2, and L1 is smaller than L2;

the central area of the back plate is raised to form a cavity for accommodating the light bars, the cavity comprises a flat bottom wall and inclined side walls, and each light bar is fixed on the bottom wall;

the diffusion plate has a light transmission function and is arranged opposite to the back plate to seal the cavity;

the frame is formed by splicing a plurality of frame strips, and each frame strip is connected with the diffusion plate and the corresponding edge of the back plate.

2. The direct type panel lamp with uniform light emission according to claim 1, further comprising reflective paper, wherein the reflective paper comprises a central area and a flange extending along a side length of the central area, the central area of the reflective paper is attached to the bottom wall, and the flange is attached to the side wall.

3. The direct type panel light with uniform light emission according to claim 2, wherein the reflective paper has a hollow area near the center of the central area.

4. The direct type panel lamp with uniform light emission according to claim 3, wherein two opposite edges of the hollowed-out area are adjacent to corresponding ends of the light bar along the length direction of the light bar;

along the width direction of the light bars, the two opposite edges of the hollow area are close to the middle position of the two adjacent light bars.

5. The direct type panel lamp with uniform light emission according to claim 3, wherein the reflective paper comprises a first reflective paper and a second reflective paper arranged along the width direction of the lamp strip, and at least one lamp strip is located between the first reflective paper and the second reflective paper.

6. The direct type panel lamp with uniform light emission according to claim 2, wherein the substrate is located between the reflective paper and the back plate, and the reflective paper has an avoiding hole for avoiding the LED lamp bead.

7. The direct type panel lamp of claim 1, wherein the ratio of L1: l2 ═ (0.5 to 0.7): 1.

8. the direct type panel lamp with uniform light emission according to claim 1, wherein for a single lamp bar, the LED lamp beads are symmetrically distributed on two sides of the middle of the lamp bar.

9. The direct type panel lamp with uniform light emission according to claim 1, wherein all the light bars are connected in parallel through a conductive strip, and the conductive strip is connected with each light bar in a welding manner;

the conductive strips are perpendicularly intersected with all the light bars and press all the light bars.

10. The direct type panel lamp with uniform light emission according to claim 1, wherein the back plate has a matrix distribution of recesses, and the light bar is disposed between two rows of recesses.

Images