CN213983262U - Direct type panel lamp - Google Patents

Abstract

The application discloses a direct type panel lamp which comprises a frame, a diffusion plate, a back plate and at least one lamp strip; the frame is formed by splicing a plurality of frame strips, and each frame strip is provided with a first mounting surface and a second mounting surface which are at different heights; the edge overlap joint of diffuser plate is on lower first installation face, and the marginal zone overlap joint of backplate is on higher second installation face, and central zone arch is just configured into the installation fixed the lamp strip, and marginal zone makes through deformation along the first protruding muscle and the protruding muscle of second that the length of side direction of backplate extends, first protruding muscle support press the edge of diffuser plate make it paste and lean on first installation face, and this scheme is for prior art, and the protruding muscle of second is mutually supported with first protruding muscle to increase the support intensity of whole backplate, avoids marginal zone pulling frame, makes the frame take place deformation, so that the plane that straight following formula panel light and the fossil fragments on the ceiling contacted levels, can not appear the gap.

Description

Direct type panel lamp

Technical Field

The application relates to a panel light field especially relates to a 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 surface of the frame, the diffusion plate is installed on the front surface of the frame, the light-emitting elements 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 of the backlight of the panel lamp. 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.

When the panel light was installed on the fossil fragments of ceiling, because light emitting component's weight direct action is on the backplate, the middle part that leads to the backplate can sink downwards, and the edge of backplate can the perk, can take place the marginal pulling frame deformation of backplate to make the frame form the warpage, cause the problem that the panel light can't be set level on the fossil fragments.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the application provides a straight following formula panel light can avoid frame deformation.

The application provides a straight following formula panel light includes:

the LED lamp comprises at least one lamp strip and a light source, wherein the lamp strip comprises a substrate, LED lamp beads fixed on the substrate and lenses covered on the LED lamp beads;

the frame is formed by splicing a plurality of frame strips, and each frame strip is provided with a first mounting surface and a second mounting surface which are at different heights;

the diffusion plate has a light transmission function, and the edge of the diffusion plate is lapped on the lower first mounting surface;

the lamp strip comprises a back plate, wherein the back plate is of a housing-shaped structure which is made of a metal plate through deformation, the edge area of the back plate is lapped on a higher second mounting surface, the central area of the back plate is arched and is configured to be used for mounting and fixing the lamp strip, the edge area is deformed into a first convex rib and a second convex rib which extend along the side length direction of the back plate, and the first convex rib is abutted against the edge of the diffusion plate to enable the diffusion plate to be attached to the first mounting surface.

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 cross section of the first rib and the cross section of the second rib are both U-shaped structures, and the opening directions of the two U-shaped structures are opposite.

Optionally, the height of the first rib is L1, the width of the first rib is L2, the height of the second rib is L3, the width of the second rib is L4, and L1 is satisfied: l3 is 3-10, L2: l4 is 3-10.

Optionally, the back plate arches to form a cavity, the cavity includes a flat bottom wall and an inclined side wall, the bottom wall and the diffusion plate are arranged in parallel, the light bar is fixed on the bottom wall, and the side wall is tangent to the first convex rib.

Optionally, the bottom wall is provided with grooves for arranging the light bars in a criss-cross manner.

Optionally, the first convex rib and the second convex rib are arranged in parallel, the second convex rib is located on the outer side of the first convex rib, and the distance from the first convex rib to the edge of the back plate is 4-10 mm.

Optionally, the second ribs extend along the side length direction of the back plate at intervals or continuously.

Optionally, an included angle is formed between the part of the edge region overlapped on the second mounting surface and the second mounting surface, and the included angle gradually decreases along the direction from the end of the frame to the center.

Optionally, an interference between a distance between the first rib and the diffuser plate and a thickness of the diffuser plate is less than 0.5 mm.

Optionally, the height of the first rib on each side of the back plate gradually increases from the middle to the two ends.

The protruding muscle of second of this application straight following formula panel light mutually supports with first protruding muscle, can increase the support intensity of whole backplate, especially edge area's support intensity, when straight following formula panel light installs in the ceiling, can reduce edge area's deformation volume, avoids its pulling frame, makes the frame take place to deform, and then makes straight following formula panel light and fossil fragments contact on the ceiling apply ointment or plaster, can not appear the gap.

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 view of the frame strip of FIG. 1 without one side;

FIG. 4 is a schematic view of a partial structure of the direct type panel lamp of FIG. 1;

FIG. 5 is an enlarged view of the portion A of FIG. 4;

FIG. 6 is a schematic structural view of the first protruding strip and the frame;

FIG. 7 is a schematic structural diagram of the back plate of FIG. 1;

FIG. 8 is an enlarged view of the portion B of FIG. 7;

FIG. 9 is a schematic structural diagram of the back plate of FIG. 1;

FIG. 10 is an enlarged view of the portion C of FIG. 9;

FIG. 11 is an enlarged view of the portion D of FIG. 9;

FIG. 12 is a schematic view of the frame strip of FIG. 1;

FIG. 13 is a schematic view of a connection structure between light bars;

fig. 14 is a schematic view of the connection structure between the substrate and the flexible light bar in fig. 13;

fig. 15 is a schematic structural view of the LED lamp bead and the lens in fig. 13;

FIG. 16 is a schematic structural diagram of the circuit board of FIG. 13;

fig. 17 is a schematic structural view of the flexible light bar of fig. 13;

FIG. 18 is a schematic view of light emitted by an LED lamp bead being diffused through a lens;

fig. 19 is a schematic diagram of light emitted by an LED lamp bead diffusing through a lens.

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 metal layer; 112. an insulating layer; 113. a circuit layer; 114. a second window; 115. a pad; 12. LED lamp beads; 13. a lens; 131. a convex foot; 14. a flexible light bar; 141. a first window; 142. an insulating layer; 143. a circuit layer; 144. a solder resist layer;

20. a back plate; 21. a central region; 211. a protrusion; 22. an edge region; 23. a cavity; 231. a bottom wall; 232. a side wall; 24. a first rib; 25. a second rib;

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. 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 5, 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 a housing-like structure made of a metal plate material by deformation, the housing-like structure includes a central area 21 and an edge area 22 surrounding the central area 21, the central area 21 is arched to increase a distance from the diffusion plate 30, and is configured to mount and fix the light bar 10.

The light bar 10 comprises a substrate 11, LED beads 12 fixed on the substrate 11, and a lens 13 covering the LED beads 12, and the light bar 10 is fixed on one side of the central area 21 of the back plate 20 facing the diffusion plate 30. The diffusion plate 30 has a light transmission function, light emitted by the LED lamp beads 12 sequentially passes through the lens 13 and the diffusion plate 30, and a plurality of LED point light sources form a uniform surface light source after light diffusion.

The frame 40 is formed by splicing a plurality of (usually four) frame strips 41, each frame strip 41 has a first mounting surface 42 and a second mounting surface 43 at different heights, the edge of the diffuser plate 30 is overlapped on the lower first mounting surface 42, and the edge region 22 of the back plate 20 is overlapped on the upper second mounting surface 43 and fixed by fastening screws.

As described above, the back plate 20 is made of a metal plate, the light bar 10 is installed in the central area of the back plate 20, and under the action of gravity, the central area of the back plate 20 may also collapse, so that the corner portions of the back plate may be tilted upward, and if the strength of the frame is not sufficient, the frame may be pulled to deform and tilt.

To solve the technical problem, in some embodiments, as shown in fig. 6 to 10, the edge region 22 of the back plate 20 is deformed by itself to form a first rib 24 and a second rib 25 extending along the side length direction of the back plate 20, so as to increase the strength of the edge region 22, and in some embodiments, in order to reduce the processing difficulty of the first rib 24 and the second rib 25, the edge region 22 is bent by itself to form the first rib 24 and the second rib 25. The deformation is carried out by conventional processing methods such as mechanical stamping and the like.

In some embodiments, the first rib 24 and the second rib 25 are arranged in parallel, and the second rib 25 is located outside the first rib 24 to facilitate the installation of the back panel.

Wherein, the first rib 24 is pressed against the edge of the diffuser 30 to make it close to the first mounting surface 42, because the back plate 20 has a certain elasticity, when the first rib 24 is pressed against the diffuser 30, the first rib 24 will be elastically deformed, so that the first rib 24 applies pressure to the diffuser 30, the first rib 24 and the first mounting surface 42 cooperate to clamp the edge of the diffuser 30, so as to avoid the edge of the diffuser 30 from being bent, thereby avoiding the central portion (the geometric center of the diffuser 30 or the geometric center close to the diffuser 30) of the diffuser 30 from collapsing downwards.

Second protruding muscle 25 mutually supports with first protruding muscle 24, can increase the support intensity of whole backplate 20, especially edge area 22's support intensity, when straight following formula panel light 100 installs in the ceiling, can reduce edge area 22's deformation volume to make edge area 22 be in the leveling condition all the time, avoid its pulling frame 40, make frame 40 take place deformation, and then make straight following formula panel light 100 and the fossil fragments contact on the ceiling apply ointment or plaster, the gap can not appear.

In order to further solve the problem that deformation of the back plate 20 is often unavoidable, and the provision of a plurality of ribs merely alleviates the problem, as shown in fig. 11, the height of the first rib 24 on each side of the back plate 20 is gradually increased from the middle to both ends to counteract the deformation of the back plate 20. In some embodiments, the two first ribs 24 located on adjacent sides of the back plate 20 are disposed in series.

When the first ribs 24 tightly abut against the diffusion plate 30, in order to avoid a gap between the first ribs 24 and the diffusion plate 30 (for example, caused by an excessively large height difference between the highest position and the lowest position of the first ribs 24) and prevent the deformation of the backplate 20 from being reversely offset (for example, caused by an excessively small height difference between the highest position and the lowest position of the first ribs 24), in some embodiments, the height of the highest position of the first ribs 24 is H1, the height of the lowest position is H2, and H1 is satisfied: h2 is 1.02-1.1: 1.

preferably, H1: h2 is 1.05-1.08: 1. in the present embodiment, the height of the first bead 24 at the highest position is 4.2 mm. The height of the lowest part is 4 mm.

In order to solve the above technical problem, when the first rib 24 presses the diffuser plate 30 too tightly, the back plate 20 is more likely to pull the frame to warp, and in some embodiments, an interference between the first rib 24 and the diffuser plate 30 with respect to a thickness of the diffuser plate is less than 0.5mm (e.g., X in fig. 6). Wherein, the pressure range of the back plate 20 acting on the diffusion plate 30 is controlled to be 0-100N.

Preferably, the interference between the first ribs 24 and the diffusion plate 30 with respect to the thickness of the diffusion plate is less than 0.3mm, so that the pressure applied to the diffusion plate 30 by the back plate 20 is controlled within a range of 0 to 50N.

Also in order to solve the problem of deformation of the bezel, in some embodiments, the portion of the edge region 22 overlapping the second mounting surface 43 forms an included angle with the second mounting surface 43, and the included angle gradually decreases along the direction from the end to the center of the bezel 41, so as to also counteract the deformation of the backplate 20.

The maximum included angle between the part of the edge region 22 overlapped on the second mounting surface 43 and the second mounting surface 43 is theta 1, the minimum included angle is theta 2, and the following conditions are satisfied: θ 1: θ 2 is 1.1 to 1.5: 1, preferably, θ 1: θ 2 is 1.1 to 1.3: 1. in the present embodiment, θ 1 is 4 degrees and θ 2 is 5 degrees.

The angle between the portion of the edge region 22 overlapping the second mounting surface 43 and the second mounting surface 43 is in the range of 3 degrees to 10 degrees. Preferably, the included angle between the part of the edge region 22 overlapping the second mounting surface 43 and the second mounting surface 43 ranges from 3 degrees to 8 degrees.

In some embodiments, the side frame strips 41 are made of metal (e.g., aluminum alloy), and the adjacent ends of the side frame strips 41 are welded and fixed. Of course, the frame strips 41 may also be made of a polymer material by injection molding, and since the polymer material cannot be welded, corner pieces for connecting adjacent frame strips 41 are generally required to be disposed at corners of the frame 40, or the adjacent frame strips 41 are connected by lap joints, but compared with a welding process, the flatness of the frame 40 is poor.

In some embodiments, as shown in fig. 12, the cross section of the frame strip 41 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, to increase the strength of the profile, the thickness of the inner side of the corner of the frame strip 41 is increased to form a thickened portion 46, so as to form a step structure on the horizontal portion 44, and the first mounting surface 42 and the second mounting surface 43 are respectively located on the step structure and the horizontal portion 44. To save material, in some embodiments, the thickening is a hollow structure.

In some embodiments, the first rib 24 and the second rib 25 each have a U-shaped cross section, and the two U-shaped cross sections open in opposite directions.

In the present embodiment, when the direct type panel light 100 is in the installed state, the U-shaped structure of the first rib 24 is disposed with its opening facing upward, and the second rib 25 is disposed with its opening facing downward.

In order to make the first ribs 24 abut against the diffusion plate 30 and be elastically deformed, and to reduce the deformation amount of the second ribs 25, the height of the first ribs 24 is L1, the width is L2, the height of the second ribs 25 is L3, the width is L4, and L1 is satisfied: l3 is 3-10, L2: l4 is 3-10.

Preferably, L1: l3 is 3-10, L2: l4 is 3-10. In the present embodiment, the first bead 24 has a height of 4.2mm and a width of 23 mm; the second ribs 25 have a height of 0.6mm and a width of 0.7 mm.

It should be noted that, when the direct type panel light 100 is in the installation state, the height of the first rib 24 and the height of the second rib 25 are the lengths along the vertical direction, and the width of the first rib 24 and the width of the second rib 25 are perpendicular to the vertical direction.

The second ribs 25 are arranged in a manner that, referring to one embodiment, the second ribs 25 extend along the side length of the back plate 20 at intervals or continuously. In the present embodiment, the second rib 25 extends continuously along the side length direction of the back plate 20.

In order to provide some structural strength to the edge region 22 itself, in some embodiments, the first rib 24 is spaced from the edge of the backing plate 20 by a distance of 4mm to 10 mm.

Preferably, the first rib 24 is spaced 5mm from the edge of the back plate 20.

From a manufacturing and heat dissipation perspective, the housing 20 is stamped and formed of a metal sheet (e.g., ST13) into a curved housing-like structure so that the housing 20 and the diffuser 30 are spaced apart from each other to accommodate the light bar 10. in some embodiments, the housing 20 is curved to form a cavity 23, the cavity 23 includes a flat bottom wall 231 and an inclined side wall 232, the bottom wall 231 and the diffuser 30 are arranged in parallel, the light bar 10 is fixed on the bottom wall 231, the side wall 232 is tangentially connected to the first rib 24, and the light bar 10 is mounted on the lower surface of the bottom wall 231.

In some embodiments, the portion of the edge region 22 overlapping the frame 40 is parallel to the bottom wall 231, and the bottom wall 231 is higher than the edge region 22. When the direct type panel lamp 100 is installed on a ceiling, the bottom wall 231 is horizontally disposed, and the portion of the corresponding edge region 22 overlapping the frame 40 is also horizontally disposed.

To facilitate positioning of the light bar 10, in some embodiments, as shown in fig. 1 and 2, the bottom wall 231 is provided with grooves for criss-cross positioning of the light bar 10. In order to facilitate the processing of the groove on the back plate 20, the central region 21 of the back plate 20 is punched to form a plurality of protrusions 211 facing away from the cavity 23, the groove is formed between adjacent protrusions 211, the light bars 10 are arranged in parallel, therefore, the protrusions 211 are also arranged in parallel, and the gaps between adjacent protrusions 211 are used for mounting the light bars 10, so that the light bars 10 are generally in a straight strip structure. Of course, the lamp strip can also be selected to adopt a snake disk type structure.

In some embodiments, the edge region 22 of the back panel 20 is fixed to the frame 40 by fastening screws, and for convenience of installation, the frame strip 41 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 22.

In order to reduce the weight of the back plate 20 itself, the thickness of the back plate 20 is 0.2mm to 0.4mm in some embodiments while satisfying the supporting strength of the back plate 20. Preferably, the thickness of the back plate 20 is 0.3 mm.

The substrate 11 may be a metal substrate, preferably an aluminum substrate, or an FR-4 glass fiber board. In some embodiments, the substrate 11 is coated with white solder resist ink to improve light reflection efficiency. The substrate 11 may be fixed to the lower surface of the back plate 20 by screws, preferably by bonding with a thermally conductive adhesive.

In some embodiments, as shown in fig. 13-17, adjacent light bars 10 are connected in parallel by wires or flexible light bars 14. LED lamp pearl 12 is the matrix distribution in backplate 20 inboard for light source evenly distributed, the installation of being convenient for simultaneously.

In some embodiments, the substrate 11 includes a metal layer 111, an insulating layer 112 and a circuit layer 113, and the LED beads 12 are soldered on the circuit layer 113. A bonding pad 115 for soldering the LED lamp bead 12 is generally disposed on the circuit layer 113. In order to provide protection for the circuit layer 113, the surface of the substrate 11 is coated with white solder resist ink to form a solder resist layer 144, and a window is left at the pad 115 to expose the pad 115 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.

In some embodiments, the flexible light bars 14 are pressed on all the light bars 10 and perpendicularly intersect with all the light bars 10, so that the flexible light bars 10 and the flexible light bars 14 can be conveniently welded. The flexible light bar 14 is of a strip-shaped structure and comprises an insulating layer 142, a circuit layer 143 and a solder mask layer 144, wherein the insulating layer 142 is made of an insulating resin material, and the solder mask layer 144 is formed by white solder mask ink coated on the surface, so that the position where the flexible light bar 14 is arranged also has a light reflecting function.

In order to realize connection, the edge of the flexible light bar 14 has a first window 141 which is not coated with solder resist ink, the position of the substrate 11 close to the flexible light bar 14 also has a second window 114 which is not coated with solder resist ink, and the two openings are provided with solder pads, and the two windows are electrically connected by welding.

In order to improve the light reflection effect, the lower surface of the back plate 20 is provided with a white light reflection coating, which may be various metal paints, including epoxy resin, UV resin, and the like.

The light spot projected on the diffusion plate 30 after passing through the lens 13 is circular, and in order to make the light diffusion uniform, the light spot should be spread over the whole diffusion plate 30, as shown in fig. 8 and 19, 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 at each position of the diffusion plate 30 is substantially uniform.

Assuming that the beam angle of the lens 13 is R, the vertical distance from the LED lamp bead 12 to the diffusion plate 30 is d, and it is satisfied that all points of the diffusion plate 30 have light projected thereon, the relation

It can be seen that, when the beam angle R of the lens 13 is larger and the thickness of the panel light is determined, the larger the distance between the LED lamp beads 12 can be arranged, that is, the smaller the number of the arranged LED lamp beads 12 can be.

In some embodiments, the beam angle of the lens 13 is 168 °, which is generally not less than 160 °, so that the thickness of the panel light reaches 20-30mm, and the spacing between the LED beads 12 reaches 50-80 mm.

In order to enable the direct type panel light 100 to work normally, a driving module is disposed on the direct type panel light 100, and the flexible light bar 14 is electrically connected to the driving module through a wire. To facilitate securing and protecting the drive module, the drive module is often disposed within the drive cartridge 50.

In order to facilitate the packaging and transportation of the direct type panel lamp 100, the driving box 50 is disposed in the gap between the back plate 20 and the vertical portion 45, and the top surface of the driving box 50 is lower than the top surface of the back plate 20 or the vertical portion 45, so that the driving box 50 is not exposed to the outside, and external force is prevented from acting on the driving box 50.

To facilitate assembly of the drive cartridge 50, the drive cartridge 50 is also secured in the gap by a fastening screw that passes through the screw slot 471. The driving box 50 comprises a box body with an opening and a top cover buckled at the opening of the box body, the driving module is placed in the box body, and wire holes for the connecting wires of the driving module to pass through are formed in the two ends of the box body. When the driving module is replaced or maintained, the driving module only needs to be taken out of the box body, so that the steps of maintaining or replacing the driving module are simplified.

The both ends of box body are equipped with the auricle that extends towards the box body, and this auricle passes through fastening screw to be fixed on frame 40, and the bottom surface of auricle is flushed mutually with the bottom surface of box body. In order to reduce the processing technology difficulty between auricle and the box body, can strengthen the structural strength between auricle and the box body simultaneously, be an organic whole between auricle and the box body and set up.

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. Direct type panel light, its characterized in that includes:

the LED lamp comprises at least one lamp strip and a light source, wherein the lamp strip comprises a substrate, LED lamp beads fixed on the substrate and lenses covered on the LED lamp beads;

the frame is formed by splicing a plurality of frame strips, and each frame strip is provided with a first mounting surface and a second mounting surface which are at different heights;

the diffusion plate has a light transmission function, and the edge of the diffusion plate is lapped on the lower first mounting surface;

the lamp strip comprises a back plate, wherein the back plate is of a housing-shaped structure which is made of a metal plate through deformation, the edge area of the back plate is lapped on a higher second mounting surface, the central area of the back plate is arched and is configured to be used for mounting and fixing the lamp strip, the edge area is deformed into a first convex rib and a second convex rib which extend along the side length direction of the back plate, and the first convex rib is abutted against the edge of the diffusion plate to enable the diffusion plate to be attached to the first mounting surface.

2. The direct type panel lamp according to claim 1, wherein the first rib and the second rib are U-shaped in cross section, and the openings of the two U-shaped structures are opposite.

3. The direct type panel lamp according to claim 2, wherein the first rib has a height of L1 and a width of L2, and the second rib has a height of L3 and a width of L4, and satisfies L1: l3 is 3-10, L2: l4 is 3-10.

4. The direct type panel lamp as claimed in claim 1, wherein the back plate is arched to form a cavity, the cavity comprises a flat bottom wall and inclined side walls, the bottom wall and the diffuser plate are arranged in parallel, the light bar is fixed on the bottom wall, and the side walls are tangentially connected with the first ribs.

5. The direct type panel lamp according to claim 4, wherein the bottom wall is provided with grooves for criss-cross arrangement of the light bars.

6. The direct type panel lamp according to claim 1, wherein the first ribs and the second ribs are arranged in parallel, the second ribs are located outside the first ribs, and the distance from the first ribs to the edge of the back plate is 4mm to 10 mm.

7. The direct type panel lamp according to claim 1, wherein the second ribs are spaced apart or continuous along a side length direction of the back plate.

8. The direct type panel lamp according to claim 1, wherein the portion of the edge region overlapping the second mounting surface forms an angle with the second mounting surface, the angle gradually decreasing from the end to the center of the bezel.

9. The direct type panel lamp according to claim 1, wherein an interference of a distance between the first rib and the diffusion plate with respect to a thickness of the diffusion plate is less than 0.5 mm.

10. The direct type panel lamp according to claim 1, wherein the height of the first bead at each side of the back plate is gradually increased from the middle to both ends.

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