WO2018040681A1 - 一种平面灯 - Google Patents

一种平面灯 Download PDF

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Publication number
WO2018040681A1
WO2018040681A1 PCT/CN2017/089184 CN2017089184W WO2018040681A1 WO 2018040681 A1 WO2018040681 A1 WO 2018040681A1 CN 2017089184 W CN2017089184 W CN 2017089184W WO 2018040681 A1 WO2018040681 A1 WO 2018040681A1
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WO
WIPO (PCT)
Prior art keywords
layer
light guiding
light
diffusion
guiding layer
Prior art date
Application number
PCT/CN2017/089184
Other languages
English (en)
French (fr)
Inventor
盛玉林
Original Assignee
昆山市诚泰电气股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 昆山市诚泰电气股份有限公司 filed Critical 昆山市诚泰电气股份有限公司
Priority to CN201780002956.7A priority Critical patent/CN108291696A/zh
Priority to EP17844987.2A priority patent/EP3358247B1/en
Publication of WO2018040681A1 publication Critical patent/WO2018040681A1/zh
Priority to US15/941,007 priority patent/US10274669B2/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0093—Means for protecting the light guide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V15/00—Protecting lighting devices from damage
    • F21V15/04—Resilient mountings, e.g. shock absorbers 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V19/00—Fastening of light sources or lamp holders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V19/00—Fastening of light sources or lamp holders
    • F21V19/001—Fastening of light sources or lamp holders the light sources being semiconductors devices, e.g. LEDs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0065—Manufacturing aspects; Material aspects
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0075—Arrangements of multiple light guides
    • G02B6/0076—Stacked arrangements of multiple light guides of the same or different cross-sectional area
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0086—Positioning aspects
    • G02B6/0088—Positioning aspects of the light guide or other optical sheets in the package
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0086—Positioning aspects
    • G02B6/009—Positioning aspects of the light source in the package
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V2200/00—Use of light guides, e.g. fibre optic devices, in lighting devices or systems
    • F21V2200/20—Use of light guides, e.g. fibre optic devices, in lighting devices or systems of light guides of a generally planar shape
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0045—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide
    • G02B6/0046—Tapered light guide, e.g. wedge-shaped light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0051—Diffusing sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0073—Light emitting diode [LED]
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0075—Arrangements of multiple light guides
    • G02B6/0078—Side-by-side arrangements, e.g. for large area displays
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0085—Means for removing heat created by the light source from the package

Definitions

  • the invention belongs to the technical field of lamps, and particularly relates to a flat lamp.
  • LED Light Emitting Diode
  • LED lamps have become more and more widely used in daily lighting and display. More common applications, such as LED light panels, that is, a plurality of LED lamp heads are arranged in an array in a lampshade, and a corresponding driving circuit is arranged in the lampshade.
  • the LED lamp panel adopts a direct-lit LED. The form of the light source is more glaring, and the uniformity of the emitted light is not good (the uniformity is less than 70%). Therefore, some manufacturers have developed a class of LED flat lamps. These LED flat lamps are square and flat, and the inner parts are also flat.
  • the main purpose is to install a flat reflective layer and light guide in a rectangular outer frame.
  • a layer and a diffusion layer, and an LED strip is installed in the outer frame and at the side of the light guiding layer, and the light is reflected by the reflection layer and the light guiding layer to achieve uniformity by multiple reflections, and through the diffusion layer Effectively prevent glare.
  • Such LED flat lamps will emit heat when working, and the generated heat will not be dissipated in time. Based on the principle of thermal expansion and contraction, the LED flat lamps are easily deformed and damaged, thus shortening the service life.
  • the diffusion plate is made of the same material, for example: PS (polystyrene) ⁇ PMMA (polymethyl methacrylate) ⁇ PC (polycarbonate) ⁇ PET (polyethylene terephthalate) ⁇ PP (poly Propylene) ⁇ PE (polyethylene), etc., but not limited to these materials, of which PS ⁇ PMMA ⁇ PC ⁇ PET has good flatness but hard material, PP ⁇ PE material is soft and easy to deform, and not flat enough.
  • the conventional light guiding layer is also made of the same plastic material, such as PS ⁇ PMMA ⁇ PC ⁇ PET, but is not limited to these materials. And the design of conventional flat panel and surface light source products is that the light guiding layer and the diffusion layer are closely attached together.
  • the diffusing layer and the light guiding layer of the prior art flat panel light and the surface light source product are basically the same material. If the PS ⁇ PMMA ⁇ PC ⁇ PET has a good flatness but a hard material, the light guiding layer is easy to be used. The friction is damaged and the light guiding layer is scrapped. If the material is soft PP/PE, it is easy to be deformed and the flatness is also poor, which affects the diffusion anti-glare effect;
  • the existing flat lamp often reduces the normal service life due to the damage of the LED lamp bead.
  • the main reason is that the LED light bar loaded with several LED lamp beads in the LED flat lamp has two and is oppositely arranged on the light guide.
  • the LED lamp bead emits heat while generating heat, and the light guiding layer expands to the periphery after being heated, thereby squeezing the LED lamp bead on the LED strips on both sides, causing Bad damage of LED lamp beads, shortening the service life of the entire LED flat lamp;
  • the light guiding layer is not suitable for large size due to the process problem.
  • the light guiding layer can only be spliced, but the way of splicing the light guiding layer exists as follows. Defect: The light seam caused by light leakage and uneven light will appear at the joint of the light guide plate, which not only affects the aesthetics of the whole flat light, but also affects the flat light. Uniformity of illumination, which has affected the further development of the large-scale LED flat panel market, has become the main reason for restricting its market share.
  • the utility model has the advantages that the light source and the lamp are integrated, the light source is damaged, the replacement is not easy, the replacement cost is high, the light uniformity is not good, and the utilization efficiency is not ideal.
  • the technical problem to be solved by the present invention is to provide a flat lamp
  • the buffer layer can be a plastic product; has a buffer anti-deformation function; a single-sided light-increasing buffer material can be used as the wedge-shaped light guiding layer; and the diffusion layer has discoloration and prevention
  • the function of scratching the light guiding layer and the like, and the splicing light guiding layer is suitable for large flat lamps, uniform illumination, low cost, scientific design and easy implementation.
  • a technical solution adopted by the present invention is to provide a planar light comprising a light guiding layer, a reflective layer, a diffusion layer, a buffer layer and a back plate, the light guiding layer having opposite surfaces and a back surface and a light exiting surface, the reflective layer is located on the back surface of the light guiding layer, the diffusion layer is located on the light emitting surface of the light guiding layer, and the buffer layer is located between the backing plate and the reflective layer a plurality of light guiding points between the reflective layer and the light guiding layer;
  • the light source and the outer frame are further included, and the diffusion layer, the light guiding layer, the reflective layer, the buffer layer and the back plate are all fixed in the outer frame, and an incident point of the light source is located at the guide The side of the light layer;
  • the stack of the back sheet, the light guiding layer, the reflective layer, the buffer layer and the diffusion layer is a flat plate shape.
  • the buffer layer is a blister buffer layer
  • the blister buffer layer is a blister product composed of a convex portion and a concave portion.
  • the light guiding layer is a wedge-shaped light guiding layer having a right-angled trapezoidal cross section, a side of the light guiding layer is a light entering side, and the light entering side is provided with an LED light bar, and a thin side of the light guiding layer With cushioning material.
  • the buffer layer has a thickness of 0.3 to 15 mm.
  • the structure in which the back plate, the light guiding layer, the reflective layer, the buffer layer, and the diffusion layer are formed into a flat plate shape is one of the following three structures:
  • the light guiding layer, the buffer layer, the reflective layer and the backing plate are all flat, the buffer layer is parallel to the backing plate, and the light guiding layer is parallel to the buffer layer;
  • the light guiding layer is a wedge-shaped light guiding layer having a right-angled trapezoidal cross section
  • the buffer layer is a wedge-shaped buffer layer having a right-angled trapezoidal cross section
  • the back surface of the light guiding layer is a first inclined surface
  • the buffer layer is close to One side of the reflective layer is a second inclined surface, the first inclined surface is parallel to the second inclined surface, and the reflective layer is located between the first inclined surface and the second inclined surface, the back plate and the The reflective layers are all flat;
  • the light guiding layer is a wedge-shaped light guiding layer having a right-angled trapezoidal cross section
  • the backing plate is a wedge-shaped plate having a right-angled trapezoidal cross section
  • the back surface of the light guiding layer is a first inclined surface
  • the second inclined surface is parallel to the second inclined surface, and the buffer layer and the reflective layer are both flat.
  • the diffusion layer includes a first diffusion single layer and a second diffusion single layer
  • the first diffusion single layer has opposite two surfaces and is respectively a light incident surface of the diffusion layer and a first overlap
  • the second diffusion single layer has opposite two a surface and a light emitting surface of the diffusion layer and a second overlapping surface, respectively, wherein the first overlapping surface of the first diffusion single layer and the second overlapping surface of the second diffusion single layer overlap each other,
  • the light incident surface of the first diffusion single layer is in contact with the light exit surface of the light guide layer, and the hardness of the first diffusion single layer is smaller than the hardness of the second diffusion single layer.
  • the diffusion layer is one of the following three structures:
  • One of the first diffusion monolayer and the second diffusion monolayer is a colored layer
  • the first diffusion monolayer and the second diffusion monolayer are both colored layers
  • the first diffusion single layer and the second diffusion single layer are both a color layer, and further includes a light transmissive colored layer, wherein the transparent colored layer is located on the first diffusion single layer and the second diffusion sheet Between the layers.
  • the light source is two LED strips located at the side of the light guiding layer
  • the light guiding layer is in the shape of a square sheet
  • the light guiding layer has opposite back and light emitting surfaces and four sides
  • the back surface of the light guiding layer has a plurality of light guiding points
  • the two LED light bars are respectively disposed at a pair of adjacent side faces of the light guiding layer, and the other adjacent side faces of the light guiding layer are disposed
  • the arrangement of the light guiding points is based on the intersection of the pair of adjacent side faces and gradually increases the unit coverage area of the light guiding point along the back surface of the light guiding layer.
  • the light source is located in the outer frame and is located at a side of the light guiding layer, and at least one of the outer frame and the back plate is provided with a slot capable of inserting and removing the light source.
  • an optical inlet for introducing light is reserved on the outer frame and on the side of the light guiding layer.
  • the light guiding layer is a spliced light guiding layer: the light guiding layer is formed by splicing a plurality of light guiding plates on the same plane, and the reflective layer is closely overlapped on the back surface of the light guiding layer And a light guiding point is formed on a contact surface of the reflective layer and the light guiding layer, and the diffusion layer is 1-3 cm away from the light guiding layer.
  • the invention further includes a glass plate, the side of the glass plate overlapping the reflective layer is a back surface and the other surface is a front surface, the back surface of the glass plate is formed with a plurality of light guiding points, and the glass plate is The front side is a rough surface which is uneven, and the glass plate constitutes an integrated light guiding layer and a diffusion layer.
  • the light guiding layer is a central light guiding layer, and further includes a side light guiding layer having a back surface, a light emitting surface opposite to the back surface, and a side surface between the back surface and the light emitting surface.
  • the back surface of the central light guiding layer has a light guiding point
  • the side light guiding layer is located at a side surface of the central light guiding layer
  • the side light guiding layer has a rear surface parallel to the back surface of the central light guiding layer, and a front surface opposite to the rear surface, an inner side opposite to a side surface of the central light guiding layer, and an outer side opposite to the inner side surface
  • the inner side surface of the side light guiding layer is in contact with the side surface of the central light guiding layer
  • the outer side surface of the side light guiding layer has a light guiding point
  • the light source is disposed at the side light guiding layer, and the light source is incident between the inner and outer side surfaces of the side light guiding layer and along the length of the side light
  • the light guiding point is one of the following structures:
  • the light guiding point is located at a back side of the light guiding layer
  • the light guiding point is located on the reflective layer and faces one side of the light guiding layer;
  • a transparent film is further disposed, the light guiding point is printed on the transparent film, and the transparent film is adhered to the back surface of the light guiding layer;
  • a transparent film is further provided, and the light guiding spot is printed on the transparent film, and the transparent film is adhered to the reflective surface of the reflective layer.
  • the light guiding point is a convex dot or a concave dot.
  • the light guiding point is formed by ink screen printing, coating, hot pressing, laser spotting or directly forming dots or lines on the back side of the light guiding layer.
  • the arrangement of the light guiding points is one of the following three arrangement structures:
  • the spacing of the light guiding points is the same and the size of the light guiding point is gradually increased;
  • the spacing of the light guiding points is gradually increased and the size of the light guiding points is the same;
  • the shape of the light guiding point is a rhombus, a regular pentagon, an equilateral triangle, a circle, a regular hexagon, an ellipse or a regular octagon.
  • the blister buffer layer is a PVC layer, a PET layer, a PP layer, a PE layer, a PMMA layer, a PC layer or a PS layer.
  • the light guiding layer is a glass layer or a transparent plastic layer
  • the transparent plastic layer is a PMMA layer, a PC layer, a GPPS layer or a PET layer.
  • the outer frame is a metal outer frame, and the metal outer frame has a rectangular shape, and the metal outer frame is bent and welded by a whole metal profile, and the metal profiles are perpendicular to each other and integrally formed.
  • the first side and the second side, the first side is a continuous strip shape, and the second side is a broken strip shape having four slits, each of the slits being the same and having a vertex angle a 90° isosceles triangle shape, the four slits divide the second surface into five trapezoidal faces, and the metal profiles are bent at four slits and end to end to form a rectangular metal frame, and
  • the position corresponding to the four slits on the first surface of the metal profile is bent to form a rounded corner, and the adjacent trapezoidal faces of the second side of the metal profile and the trapezoidal faces that meet end to end are at the waist Welding, the first side of the metal profile forms a side frame surface of the metal frame and the four corners form four corners of
  • the outer frame is a plastic outer frame
  • the plastic outer frame and the diffusion layer are integrally formed as a plastic outer cover
  • the diffusion layer is integrally connected to the front end of the plastic outer frame at an edge thereof.
  • the light source is an LED, an OLED or a laser.
  • a reflective sheet is disposed on a side surface of the light guiding layer except for a portion where the light source is located.
  • the light source is incident on a side surface of the light guiding layer, and the flat lamp has a long afterglow material;
  • the structure of the planar lamp having a long afterglow material is: at least one of the reflective layer and the light guiding layer and between the light guiding layer and the diffusion layer is provided with a long afterglow transparent plastic board.
  • the long afterglow transparent plastic plate is a light transmissive plastic sheet coated with a long afterglow coating on the surface
  • the transparent plastic sheet is a long afterglow transparent plastic sheet formed by adding a long afterglow material to the raw material.
  • the light-transmissive plastic sheet has an incident surface of the light and an exit surface opposite to the incident surface, and at least one of the incident surface and the exit surface is covered with a long afterglow coating, and the surface of the light-transmissive plastic sheet on which the long afterglow coating is located Referring to the coated surface, the long afterglow coating on the transparent plastic sheet is one of the following four structures:
  • a long afterglow coating of the same color covers the coated surface
  • the coated surface is divided into at least two regions, each region corresponding to a long afterglow coating covering one color, and different regions are covered with long afterglow coatings of different colors to form an indication pattern;
  • the coating surface is divided into a bare area exposing the coated surface and a covering area covering the long afterglow coating, and the long afterglow coating covers the covered area to form an indication pattern;
  • the long afterglow coating has at least two layers, at least the two layers of long afterglow coatings have different colors and different coating ranges constitute an indication pattern.
  • the method further includes installing a top case having a fixing device on the mounting top case, the fixing device being capable of fixing the mounting top case to the ceiling, the outer frame being detachably coupled to the mounting top case .
  • the fixing device is a snap spring.
  • the first diffusion single layer is a PS layer, a PMMA layer, a PC layer or a PET layer, and the second diffusion single layer is a PP layer or a PE layer.
  • the buffer material is a strip of strip-shaped buffer material continuously distributed along the side surface of the light guiding layer or a dot-shaped buffer material block intermittently distributed along the side surface of the light guiding layer.
  • the buffer material is a spring, an EVA cushioning material, an EPS buffer material, an EPP cushioning material, an EPE cushioning material, or an EPO cushioning material.
  • the LED light bar is located between the outer frame and the light guiding layer
  • the buffer material is located between the outer frame and the light guiding layer.
  • the buffer material is attached to the side surface of the light guiding layer or the inner side surface of the outer frame.
  • the outer frame has a side frame surface and a front end bearing surface at a front end of the side frame surface
  • the back plate is located at a back surface of the buffer layer and is fixed to a rear end of the outer frame
  • the slot is opened in the At least one of an edge of the backboard and a side frame surface and a front end bearing surface of the outer frame.
  • the front side of the glass plate is a frosted surface formed by a sanding treatment.
  • the front surface of the glass plate is a jade surface formed by erosive water.
  • the central light guiding layer is rectangular, and the side light guiding layer is disposed on at least one of the side surfaces.
  • the side light guiding layer is disposed on four sides of the central light guiding layer, and the side light guiding layers on the four sides are connected in a circle, and the side guiding on one side
  • the light source is provided at an end of the light layer.
  • the light source is embedded in the side light guiding layer.
  • the inner side surface of the side light guiding layer is the same size as the side surface of the central light guiding layer.
  • the rear surface of the side light guiding layer is covered with a reflective layer
  • the front surface of the side light guiding layer is covered with a reflective layer
  • the present invention includes a light guiding layer, a reflective layer, a diffusion layer, a buffer layer and a backing plate. Since a buffer layer is used between the backing plate and the reflective layer, not only the deformation function when buffering thermal expansion and contraction but also the buffering function is obtained.
  • the thinner layer material is beneficial to improve the heat dissipation effect, so that the product has the advantages of long service life, and can also have the effect of buffering and absorbing vibration during transportation, which can effectively avoid damage during transportation and facilitate transportation;
  • the buffer layer of the present invention may be a blister product composed of a convex portion and a concave portion, the buffering effect is better, and because the blistering process is adopted, the material is saved, the quality is light, and the material is greatly saved. cost;
  • the light guiding layer of the present invention may be a wedge-shaped light guiding layer having a right-angled trapezoidal cross section.
  • the side of the light guiding layer is a light entering side, the light emitting side is provided with an LED light strip, and the thin side of the light guiding layer is provided.
  • Buffer material when the LED strip heats up, the light guiding layer is entirely expanded toward the buffer material, and the buffer material also undergoes concave or contraction elastic deformation to absorb the thermal expansion deformation of the light guiding layer, thereby preventing the light guiding layer from squeezing the LED
  • the lamp bead can prevent the damage of the LED lamp bead caused by the thermal expansion and deformation of the light guiding layer, which can effectively improve the service life of the planar light source;
  • the light guiding layer of the present invention may be a wedge-shaped light guiding layer having a right-angled trapezoidal cross section.
  • the buffer layer is a wedge-shaped buffer layer having a right-angled trapezoidal cross section or the backing plate is a wedge-shaped plate having a right-angled trapezoidal cross section. It is also suitable for LED flat lamps, and has high applicability.
  • the light guiding efficiency of the right-angled trapezoidal structure is higher. Under the same light guiding efficiency, the right-angled trapezoidal light guiding layer structure saves the material of the light guiding layer.
  • the traditional plate-shaped light guiding layer structure can save one-third of the material, which is more in line with the national energy-saving and consumption-reducing policy, and is also conducive to reducing product costs;
  • the diffusion layer of the present invention may include a first diffusion monolayer and a second diffusion monolayer, the first diffusion monolayer being in contact with the light guiding layer, and the hardness of the first diffusion monolayer being less than the hardness of the second diffusion monolayer due to
  • the first diffusing single layer close to the light guiding layer is made of a soft material having a lower hardness, which can effectively avoid the problem that the light guiding layer is damaged by the friction of the light guiding surface of the light guiding layer, and the light guiding layer is scrapped away from the other side of the light guiding layer.
  • the material with higher hardness is not easy to be deformed, and can provide better flatness and good diffusion anti-glare effect;
  • At least one of the first diffusion single layer and the second diffusion single layer is a colored layer, or a light transmissive colored layer is disposed between the two, and a multi-color discoloration diffusion layer of different colors can be used to improve the appearance of the product. , producing colored light, with a strong sense of personal design;
  • the light bar of the present invention may be disposed on a pair of adjacent side faces of the light guiding layer, and the other adjacent side faces are provided with a buffer material, which is received in the direction of the buffer material when the light guiding layer is heated.
  • the resistance is smaller than the direction in which the LED light bar is disposed, so that the light guiding layer as a whole expands toward the buffer material, and the cushioning material also undergoes concave or contraction elastic deformation to absorb the thermal expansion deformation of the light guiding layer, thereby avoiding the light guiding layer extrusion.
  • the LED lamp bead can prevent the LED lamp bead damage caused by the thermal expansion and deformation of the light guiding layer, which can effectively improve the service life of the LED planar light source; when the light guiding layer is not heated, the light guiding layer becomes cold and retracted, and the buffer material also follows The original structure is restored; the arrangement of the light guiding points on the light guiding layer enables the light emitted by the LED lamp beads to uniformly emit light after passing through the light guiding layer; the reflective layer reflects the light back to the light guiding layer to improve the use efficiency of the light;
  • the present invention may be that the light source is located in the outer frame and is located on the side of the light guiding layer, and at least one of the outer frame and the back plate is provided with a slot capable of inserting and extracting the light source, the outer frame, the reflective layer and the light guiding layer.
  • the diffusion layer and the back plate constitute a unified lamp body structure, and the light source slot is inserted into the lamp body, and the light source structure of the unified power, uniform size and shape is inserted into the light source of different powers to assemble the plane lamp of different power. It realizes the installation or replacement of the light source without disassembling the lamp body, which facilitates the maintenance of the flat lamp and the replacement of the power. It also realizes the unified production, sale and use of various power flat lamps, breaking the flat lamp.
  • the traditional idea and drawbacks of the light source fixed in the lamp body during production and the need to disassemble the flat lamp during maintenance are a major breakthrough in the production, sale and use of the flat lamp;
  • the invention may be an optical inlet port on the outer frame and on the side of the light guiding layer, and an external light source may enter.
  • the external light source is sunlight, and the light is collected by the concentrating element and then passed through the optical cable.
  • the light entrance port guides the light into the lamp, and fully utilizes the sunlight to realize the diversification and market demand of the light source of the flat lamp;
  • the light guiding layer of the present invention may be formed by splicing a plurality of light guiding plates, and a distance of 1-3 cm exists between the diffusion layer and the light guiding layer. It is because of the existence of the space of 1-3 cm that diffusion guide After the light emitted by the splicing seam of the light plate is further diffused through the diffusion layer, the effect of the splicing seam of the light guide plate can be completely invisible, and the large-sized flat lamp has the purpose of uniform illumination and beautiful appearance, and the cost is low and easy to implement;
  • the flat lamp of the present invention may comprise a glass plate, the side of the glass plate overlapping the reflective layer being the back side and the other side being the front side, the back side of the glass plate being formed with a plurality of light guiding points, and the front side of the glass plate being rugged Rough surface, the glass plate constitutes an integrated light guiding layer and a diffusion layer.
  • the reflected light will spread to various angles and be emitted from the front side of the glass plate, and the line can be
  • the light source is converted into a surface light source, and the reflective layer can reflect the light exposed at the bottom of the glass plate back into the glass plate to improve the use efficiency of the light. Since the front surface of the glass plate is a rough surface with unevenness, the glare can be effectively prevented, instead of a conventional diffusion layer, so the LED planar lamp of the present invention can emit uniform and soft light, and has high luminous efficiency;
  • the light guiding layer of the present invention uses a glass plate and the front side of the glass plate has a light diffusing function at the same time, thereby not only simplifying the structure, but also having a low cost;
  • the light guiding layer of the present invention may be a central light guiding layer, and further comprises a side light guiding layer, the back side of the central light guiding layer has a light guiding point, and the side light guiding layer is located at a side of the central light guiding layer, and the side edges
  • the inner side surface of the light guiding layer is in contact with the side surface of the central light guiding layer and the outer side surface has a light guiding point
  • the light source is disposed at the side light guiding layer, and the light source is incident between the inner and outer side surfaces of the side light guiding layer and along the edge
  • the side light guiding layer is incident in the longitudinal direction, and after being guided by the side light guiding layer, the inner side surface of the side light guiding layer is uniformly incident into the central light guiding layer, and the light guided once passes through the central light guiding layer.
  • the light-emitting surface of the central light guiding layer is uniformly emitted.
  • This light guiding structure is more uniform than the surface light source generated by the conventional light guiding layer, and it is precisely because of the support of the secondary light guiding structure that the conversion of a single high-power light source into a surface light source replaces the traditional structure in which the LED light bar is converted into a surface light source after being guided by the light guiding layer, which is a breakthrough in the development of the flat lamp, and opens a new milestone for the development of the flat lamp.
  • Figure 1 is a schematic view of the structure of the present invention (taking the light source in the outer frame as an example);
  • Figure 2 is a cross-sectional view of the blister buffer layer of the present invention.
  • Figure 3 is a plan view of the blister buffer layer of the present invention.
  • Embodiment 4 is a schematic structural view of Embodiment 1 of the present invention (taking a buffer layer as a wedge-shaped buffer layer having a right-angled trapezoidal cross section as an example);
  • Figure 5 is a schematic structural view of Embodiment 2 of the present invention.
  • Figure 6 is a schematic view showing still another structure of Embodiment 2 of the present invention.
  • FIG. 7 is a schematic structural view of a diffusion layer according to Embodiment 3 of the present invention (excluding a light-transmitting colored layer);
  • Embodiment 8 is a second schematic structural view of a diffusion layer according to Embodiment 3 of the present invention (including a light-transmitting colored layer);
  • Figure 9 is a schematic view showing an optical structure of Embodiment 4 of the present invention.
  • FIG. 10 is a schematic view showing a arrangement structure of a light guiding point according to Embodiment 4 of the present invention (taking a circular light guiding point as an example, the distance between light guiding points is the same and the size of the light guiding point is gradually increased as an example);
  • Figure 11 is a schematic structural view of Embodiment 5 of the present invention (taking a slot formed in a rear frame of the outer frame as an example);
  • Figure 12 is a second schematic structural view of the fifth embodiment of the present invention (taking a slot in the backplane as an example);
  • Figure 13 is a schematic structural view of Embodiment 6 of the present invention (with a light inlet reserved);
  • Figure 14 is a schematic structural view of Embodiment 7 of the present invention.
  • Figure 15 is a schematic structural view of Embodiment 8 of the present invention.
  • FIG. 16 is a schematic plan view of a light guiding structure according to Embodiment 9 of the present invention (the central light guiding layer is rectangular and only one side is provided with a side light guiding layer as an example);
  • Figure 17 is a schematic view showing the overall structure of a tenth embodiment of the present invention.
  • Figure 18 is a schematic structural view of a metal profile according to Embodiment 11 of the present invention.
  • Figure 19 is a schematic structural view of a metal outer frame of an eleventh embodiment of the present invention.
  • Figure 20 is a schematic structural view of a plastic cover of Embodiment 12 of the present invention.
  • the light-transmissive colored layer 33, the second inclined surface 8, the buffer material 9, the slot 10, the light entrance 11, the light guide plate 12, the glass plate 13, the central light guiding layer 14, the side light guiding layer 15, the light source 16, the first A side 71, a second side 72, a slit 73, a fillet 74, a mounting top case 17, a fixture 18, an LED strip 19 and a first bevel 20 are provided.
  • a planar lamp as shown in FIG. 1, includes a light guiding layer 1, a reflective layer 2, a diffusion layer 3, a buffer layer 4, and a backing plate 6, the light guiding layer 1 having opposite surfaces and respectively being back and a light-emitting surface, the reflective layer 2 is located on the back surface of the light-guiding layer 1, the diffusion layer 3 is located on the light-emitting surface of the light-guiding layer 1, and the buffer layer 4 is located on the back plate 6 and the reflective layer Between the reflective layer and the light guiding layer, there are a plurality of light guiding points 5;
  • the light source 16 and the outer frame 7 are further included, and the diffusion layer 3, the light guiding layer 1, the reflective layer 2, the buffer layer 4 and the back plate 6 are all fixed in the outer frame, and the light source An incident point of 16 is located at a side of the light guiding layer;
  • the stack of the back sheet, the light guiding layer, the reflective layer, the buffer layer and the diffusion layer is a flat plate shape.
  • the buffer layer 4 is a blister buffer layer, and the blister buffer layer is a blister product formed by the arrangement of the convex portion 41 and the concave portion 42.
  • the buffer layer may also be Buffer materials for non-blister products, such as springs, EVA (ethylene-vinyl acetate copolymer) cushioning materials, EPP (foamed polypropylene) cushioning materials, EPE (expandable polyethylene) cushioning materials or EPO (bubble polystyrene) Ethylene polyethylene hybrid) cushioning material, but is not limited thereto.
  • the buffer layer 4 has a thickness of 0.3-15 mm.
  • the plastic buffer layer is a PVC (polyvinyl chloride) layer, a PET (polyethylene terephthalate) layer, a PP (polypropylene) layer, a PE (polyethylene) layer, and a PMMA (polymethacrylic acid).
  • the PS layer includes, but is not limited to, general polystyrene (GPPS), high impact polystyrene (HIPS), expandable polystyrene (EPS), and metallocene polystyrene (SPS); It is not limited to high density polyethylene (HDPE) and low density polyethylene (LDPE).
  • GPPS general polystyrene
  • HIPS high impact polystyrene
  • EPS expandable polystyrene
  • SPS metallocene polystyrene
  • HDPE high density polyethylene
  • LDPE low density polyethylene
  • the plastic buffer layer is vacuum adsorbed on the surface of the mold and formed after cooling, the process is simple and easy to process; the plastic buffer layer can be designed with different patterns and is more beautiful.
  • Embodiment 1 A flat lamp, as shown in FIG. 4 , the light guiding layer is a wedge-shaped light guiding layer having a right-angled trapezoidal cross section, a side of the light guiding layer is a light entering side, and the light entering side is provided.
  • the LED strip 19 is provided with a buffer material 9 on the thin side of the light guiding layer.
  • the cross section of the buffer layer or the back plate is also a right-angled trapezoid, and the stack of the back plate, the light guiding layer, the reflective layer and the buffer layer may be a flat plate shape.
  • Embodiment 2 A planar lamp, the structure in which the back plate, the light guiding layer, the reflective layer, the buffer layer and the diffusion layer are formed into a flat plate shape is the following three structures One of them:
  • the light guiding layer 1, the buffer layer 4, the reflective layer 2 and the back plate 6 are all flat, as shown in FIG. 1;
  • the light guiding layer 1 is a wedge-shaped light guiding layer having a right-angled trapezoidal cross section
  • the buffer layer 4 is a wedge-shaped buffer layer having a right-angled trapezoidal cross section
  • the back surface of the light guiding layer 1 is a first inclined surface 20
  • One side of the buffer layer 4 adjacent to the reflective layer is a second inclined surface 8 , the first inclined surface is parallel to the second inclined surface, and the reflective layer is located between the first inclined surface and the second inclined surface.
  • the back plate and the reflective layer are all flat, as shown in FIG. 5;
  • the light guiding layer 1 is a wedge-shaped light guiding layer having a right-angled trapezoidal cross section
  • the backing plate 6 is a wedge-shaped plate having a right-angled trapezoidal cross section
  • the back surface of the light guiding layer is a first inclined surface 20, and the back surface
  • the inner surface of the plate is a second inclined surface 8, the first inclined surface and the second inclined surface are parallel, and the buffer layer and the reflective layer are all flat, as shown in FIG.
  • the reflective layer 2, the light guiding layer 1 and the diffusion layer 3 are three-layer co-extruded or double-layer co-extruded.
  • Embodiment 3 As shown in FIG. 7 and FIG. 8, a structure similar to that of Embodiment 1 is different in that the diffusion layer 3 includes a first diffusion single layer 31 and a second diffusion single layer 32, the first The diffusion monolayer 31 has opposite surfaces and is respectively a light incident surface of the diffusion layer and a first overlapping surface, and the second diffusion monolayer 32 has opposite surfaces and is respectively the diffusion layer.
  • the first overlapping surface of the first diffusion single layer 31 and the second overlapping surface of the second diffusion single layer 32 are superposed on each other, and the first diffusion single layer 31
  • the light incident surface is in contact with the light exit surface of the light guiding layer, and the hardness of the first diffusion single layer 31 is smaller than the hardness of the second diffusion single layer 32.
  • the diffusion layer is one of the following three structures:
  • One of the first diffusion monolayer 31 and the second diffusion monolayer 32 is a colored layer, as shown in FIG. 7;
  • the first diffusion monolayer 31 and the second diffusion monolayer 32 are both colored layers;
  • the first diffusion single layer 31 and the second diffusion single layer 32 are both a color layer, and further includes a light transmissive colored layer 33, wherein the transparent colored layer is located in the first diffusion single layer and the first Between two diffusion single layers, as shown in Figure 8.
  • the first diffusion monolayer 31 is a PS layer, a PMMA layer, a PC layer or a PET layer, and the second diffusion monolayer is a PP layer or a PE layer.
  • the first diffusion single layer close to the light guiding layer of the invention adopts a soft material such as PP, and has high shielding property, can effectively reduce the visibility of the light guiding layer dot, improve the product appearance and the light guiding layer yield, and is far away from the light guiding.
  • the second diffusion single layer of the layer is made of a material such as PS having a higher hardness, which can provide higher light efficiency and rigidity.
  • the diffusion layer is a diffusion layer of UGR (uniform glare value) ⁇ 19.
  • the processing process of the diffusion layer may be a multilayer extrusion, a lamination process or a multilayer composite process, but is not limited thereto.
  • Embodiment 4 As shown in FIG. 9 and FIG. 10, the light source is two LED strips 19 located at the side of the light guiding layer, the light guiding layer 1 is in the shape of a square sheet, and the light guiding layer 1 has a relative The back surface and the light emitting surface and the four sides, the back surface of the light guiding layer has a plurality of light guiding points 5, and the two LED light strips are respectively disposed at a pair of adjacent side surfaces of the light guiding layer 1 A buffer material 9 is disposed at another pair of adjacent sides of the light guiding layer.
  • the cushioning material 9 is a strip of strip-shaped buffer material continuously distributed along the side surface of the light guiding layer or a dot-shaped buffer material block intermittently distributed along the side surface of the light guiding layer.
  • the cushioning material 9 is a spring, EVA (ethylene-vinyl acetate copolymer) cushioning material, EPS (expandable polystyrene sheet) cushioning material, EPP (foamed polypropylene) cushioning material, EPE (expandable polyethylene) A cushioning material or an EPO (foamed polystyrene polyethylene hybrid) cushioning material.
  • EVA ethylene-vinyl acetate copolymer
  • EPS expandable polystyrene sheet
  • EPP fuoamed polypropylene
  • EPE expandable polyethylene
  • the LED light bar 19 is located between the outer frame 7 and the light guiding layer 1
  • the buffer material 9 is located between the outer frame 7 and the light guiding layer 1 .
  • the cushioning material 9 is attached to the side surface of the light guiding layer or the inner side surface of the outer frame.
  • the arrangement of the light guiding points 5 is one of the following three arrangement structures:
  • the spacing of the light guiding points is the same and the size of the light guiding point is gradually increased, as shown in FIG. 9;
  • the spacing of the light guiding points is gradually increased and the size of the light guiding points is the same;
  • Embodiment 5 As shown in FIG. 11 and FIG. 12, the light source 16 is located in the outer frame and is located at the side of the light guiding layer 1, and at least one of the outer frame 7 and the back plate is open to be inserted. And remove the slot 10 of the light source.
  • the slot of FIG. 11 is opened on the rear frame surface of the outer frame, and the slot of FIG. 12 is opened on the backplane 6.
  • the outer frame 7 has a side frame surface and a front end bearing surface at the front end of the side frame surface.
  • the back plate 6 is located at the back surface of the buffer layer 4 and is fixed to the rear end of the outer frame.
  • the slot is opened on the back. At least one of an edge of the panel and a side frame surface and a front end bearing surface of the outer frame.
  • Embodiment 6 As shown in FIG. 13, an optical inlet 11 for introducing light is reserved on the outer frame and on the side of the light guiding layer 1.
  • a light guiding cable is inserted into the light inlet port, and one end of the light guiding cable is connected to a side surface of the light guiding layer, and the light guiding light is The other end of the cable is connected to an external light source, for example, the external light source is sunlight, and is condensed by the concentrating element and connected to the optical fiber cable.
  • the light guiding layer 1 is a spliced light guiding layer: the light guiding layer is formed by splicing a plurality of light guiding plates 12 on the same plane, and the reflective layer 2 is closely stacked. On the back surface of the light guiding layer, the contact surface of the reflective layer and the light guiding layer has a light guiding point, and the distance of the diffusion layer 3 from the light guiding layer 1 is 1-3 cm.
  • the diffusion layer is 2 cm away from the light guiding layer.
  • Embodiment 8 As shown in FIG. 15, a glass plate 13 is further included, and one surface of the glass plate 13 overlapping the reflective layer 2 is a back surface and the other surface is a front surface, and the back surface of the glass plate 13 is formed with a plurality of The light guiding point 5, and the front surface of the glass plate 13 is a rough surface which is uneven, and the glass plate constitutes the integrated light guiding layer 1 and the diffusion layer 3.
  • the front surface of the glass plate 13 is a frosted surface formed by a sanding treatment.
  • the front surface of the glass plate 13 is a jade surface formed by the attack of the medicinal water.
  • the light guiding layer is a central light guiding layer 14, and further includes a side light guiding layer 15 having a back surface, a light emitting surface opposite to the back surface, and a back surface. And a side surface between the light-emitting surface, the back surface of the central light guiding layer has a light guiding point 5, the side light guiding layer 15 is located at a side of the central light guiding layer 14, the side light guiding layer 15 has a rear surface parallel to the back surface of the central light guiding layer, a front surface opposite to the rear surface, an inner side surface opposite to a side surface of the central light guiding layer, and an outer side surface opposite to the inner side surface, the side light guiding layer The inner side surface is in contact with the side surface of the central light guiding layer, the outer side surface of the side light guiding layer 15 has a light guiding point 5, the light source is disposed at the side light guiding layer, and the light source is disposed inside the side light guiding layer The outer side side surface is in contact with the side surface of the
  • the central light guiding layer 14 is rectangular, and the side light guiding layer is disposed on at least one of the side surfaces, as shown in FIG.
  • the side light guiding layer 15 is disposed on four sides of the central light guiding layer 14, and the side light guiding layers on the four sides are connected in a circle, and the side light guiding layer on one side The light source is provided at the end.
  • the light source 16 is embedded in the side light guiding layer 15 .
  • the inner side surface of the side light guiding layer is the same size as the side surface of the central light guiding layer.
  • the rear surface of the side light guiding layer is covered with a reflective layer, and the front surface of the side light guiding layer is covered with a reflective layer.
  • Embodiment 10 As shown in FIG. 17, further comprising a top case 17 having a fixing device 18, the fixing device capable of fixing the mounting top case to the ceiling, the outer frame 7 Removably attached to the mounting top case.
  • the fixing device 18 is a snap spring.
  • the mounting top case mounted on the ceiling and the outer frame detachably connected to the mounting top case are separately formed, it is only necessary to fix the mounting top case to the ceiling first, compared with the conventional integrated type.
  • LED flat light reduces the difficulty of installation. It is worth mentioning that when the traditional integrated LED flat light is damaged, the whole luminaire needs to be disassembled and the ceiling is easily damaged. However, the present invention only needs to remove the part of the LED flat light except the frame. The top cover can be removed and removed, and the ceiling can be completely damaged, which is very convenient for maintenance and replacement of the lamp.
  • Embodiment 11 As shown in FIG. 18 and FIG. 19, the outer frame 7 is a metal outer frame, and the metal outer frame has a rectangular shape, and the metal outer frame is bent and welded by a whole metal profile.
  • the metal profile has a first face 71 and a second face 72 that are perpendicular to each other and are integrally formed, the first face being a continuous elongated shape, and the second face being a broken length having four slits 73 a strip shape, each of the slits being the same and being an isosceles triangle shape having an apex angle of 90°, the four slits dividing the second surface into five trapezoidal faces, the metal profiles being at four slits Bending and end-to-end to form a rectangular metal frame, and the first surface of the metal profile corresponding to the four slits is bent to form a fillet 74, the second side of the metal profile Between adjacent trapezoidal faces and between the end-to-end trapezoidal faces are welded
  • the four corners of the metal frame are rounded corners formed by the bending of the profile, which has the advantages of being smooth and not injuring the hand, so that the metal frame is safe, reliable and beautiful.
  • Embodiment 12 As shown in FIG. 20, the outer frame 7 is a plastic outer frame, and the plastic outer frame and the diffusion layer 3 are integrally formed into a plastic outer cover, and the diffusion layer is integrally connected at the edge thereof. The front end of the plastic outer frame.
  • the plastic outer frame further has a front bearing surface, and an outer periphery of the front bearing surface is integrally connected with a front end of the side wall, and an inner periphery of the front end bearing surface is integrally connected with an edge of the plastic diffusion layer.
  • the outer frame and the diffusion layer are integrally formed, so that the utility model has the advantages of simple processing, low cost, convenient assembly, and the like; and since the outer frame and the diffusion layer are integrated, the outer frame can no longer have the front end bearing surface, and therefore, the front end bearing is omitted. After the surface can increase the light output area of the flat light.
  • Embodiment 12 A flat lamp, the light source 16 being incident on a side surface of a light guiding layer 1 having a long afterglow material.
  • the structure having a long afterglow material in the planar lamp is: at least between the reflective layer 2 and the light guiding layer 1 and between the light guiding layer 1 and the diffusion layer 3 a long afterglow transparent plastic plate;
  • the long afterglow transparent plastic plate is a light transmissive plastic sheet coated with a long afterglow coating on the surface
  • the transparent plastic sheet is a long afterglow transparent plastic sheet formed by adding a long afterglow material to the raw material, the transparent plastic
  • the sheet has an incident surface of the light and an exit surface opposite to the incident surface, and at least one of the incident surface and the exit surface is covered with a long afterglow coating, and the surface on which the long afterglow coating on the transparent plastic sheet is located is referred to as a coating
  • the cloth surface, the long afterglow coating on the transparent plastic sheet is one of the following four structures:
  • a long afterglow coating of the same color covers the coated surface
  • the coated surface is divided into at least two regions, each region corresponding to a long afterglow coating covering one color, and different regions are covered with long afterglow coatings of different colors to form an indication pattern;
  • the coating surface is divided into a bare area exposing the coated surface and a covering area covering the long afterglow coating, and the long afterglow coating covers the covered area to form an indication pattern;
  • the long afterglow coating has at least two layers, at least the two layers of long afterglow coatings have different colors and different coating ranges constitute an indication pattern.
  • the long afterglow material in the flat lamp can store the light. After the power is turned off, the long afterglow material in the flat lamp can slowly release the light, providing illumination or indication.
  • the function of the lamp for example, for low-level lighting after a power outage in a public place such as a hotel or an office building or a family bathroom, or after turning off the light at night, or the light emitted after the power is turned off, which constitutes a pattern, a letter and a reminder to the toilet, the safety exit, and the like.
  • the LED plane of the present invention is a green energy-saving luminaire.
  • the light guiding point 5 is one of the following structures:
  • the light guiding point is located at a back side of the light guiding layer
  • the light guiding point is located on the reflective layer and faces one side of the light guiding layer;
  • a transparent film is further disposed, the light guiding point is printed on the transparent film, and the transparent film is adhered to the back surface of the light guiding layer;
  • a transparent film is further provided, and the light guiding spot is printed on the transparent film, and the transparent film is adhered to the reflective surface of the reflective layer.
  • the light guiding point 5 is a convex dot or a concave dot.
  • the light guiding point 5 is formed by screen printing, coating, hot pressing, laser spotting or direct molding of dots or lines on the back side of the light guiding layer.
  • the light guiding point 5 is one of the following structures:
  • the light guiding point is a protruding dot having a protruding height of 0.01-0.2 mm formed by a screen printing or a diffusing agent material coated on the back surface of the light guiding layer;
  • the light guiding point is a protruding mesh point formed by the mold injection and transferred to the back surface of the light guiding layer with a protruding height of 0.001-0.03 mm;
  • the light guiding point is a concave mesh point formed by a hot pressing manner on a back surface of the light guiding layer with a concave depth of 0.01-0.2 mm;
  • the light guiding point is a concave mesh point formed by laser processing on the back surface of the light guiding layer with a concave depth of 0.05-0.3 mm.
  • the shape of the light guiding point 5 is a rhombus, a regular pentagon, an equilateral triangle, a circle, a regular hexagon, an ellipse or a regular octagon.
  • the light guiding layer 1 is a glass layer or a transparent plastic layer
  • the transparent plastic layer is a PMMA layer, a PC layer, a GPPS layer or a PET layer.
  • the light source 16 is an LED, an OLED (Organic Light Emitting Diode) or a laser.
  • a reflective sheet is disposed on a side surface of the light guiding layer 1 except for a portion where the light source is located.

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Abstract

一种平面灯，包括导光层(1)、反射层(2)、扩散层(3)、缓冲层(4)和背板(6)，导光层(1)具有相对的两个表面且分别为背面和出光面，反射层(2)位于导光层(1)的背面，扩散层(3)位于导光层(1)的出光面，缓冲层(4)位于背板(6)和反射层(2)之间，反射层(2)与导光层(1)之间具有若干导光点(5)；还包括光源(16)和外框(7)，且光源(16)的入射点位于导光层(1)的侧边；背板(6)、导光层(1)、反射层(2)、缓冲层(4)和扩散层(3)组成的叠构为平板状。缓冲层(4)可以是吸塑产品；具有缓冲防变形功能；可以采用楔形导光层(1)的单侧进光加缓冲材料；且扩散层(3)具有变色和防刮伤导光层等功能，另通过拼接式导光层(1)使其适用于大型平面灯，且发光均匀，成本低、结构设计科学和易于实施。

Description

一种平面灯 技术领域
本发明属于灯具技术领域，特别涉及一种平面灯。
背景技术
LED(Light Emitting Diode，发光二极管)技术以其省电、亮度高、使用寿命长和抗震性能好等优点被广泛推广，近几年来LED灯在日常照明以及显示器方面的应用越来越广泛。比较普遍的运用，如LED灯盘，即在一个灯罩中呈阵列状排布多个LED灯头，并在灯罩内设置相应的驱动电路，这种结构虽然简单实用，但是LED灯盘采用直下式LED光源形式，比较刺眼，发出的光线均匀度不佳(均匀度小于70％)。于是，有业者研发出了一类LED平面灯，该类LED平面灯呈方形平面状而且里面的部件也都为平面状，主要是在一个矩形外框内依次安装平面状的反射层、导光层和扩散层，并在外框内并且在导光层的侧边处安装LED灯条，光线在反射层和导光层的共同作用下经过多次反射达到提高均匀度的目的，并通过扩散层有效防止眩光。此类LED平面灯在工作时会发光发热，产生的热量若不能及时散出，基于热胀冷缩原理，LED平面灯容易变形、损坏，故而缩短使用寿命。
另外，现有技术的平面灯还存在以下问题：
一、扩散板采用同一材质，比如：PS(聚苯乙烯)\PMMA(聚甲基丙烯酸甲酯)\PC(聚碳酸酯)\PET(聚对苯二甲酸乙二醇酯)\PP(聚丙烯)\PE(聚乙烯)等，但不局限于这些材质，其中PS\PMMA\PC\PET平整度较好但材质较硬，PP\PE材质较软容易变形，也不够平整。而常规的导光层也是同一塑料材质的，比如：PS\PMMA\PC\PET等，但不局限于这些材质。且常规的平板灯及面光源产品中的设计是导光层与扩散层紧密贴合在一起的。如果导光层及扩散层使用同一种材料，则容易使导光层出光面摩擦受损而造成导光层报废。所以现有技术的平板灯及面光源产品的扩散层与导光层采用材质基本相同，若采用PS\PMMA\PC\PET平整度较好但材质较硬的材质，容易使导光层出光面摩擦受损而造成导光层报废，若采用材质较软的PP\PE等，容易变形，平整度也差，影响扩散防眩光效果；
二、现有平面灯常常由于LED灯珠的损坏而降低正常使用寿命，究其主要原因是，LED平面灯中的装载有若干个LED灯珠的LED灯条有两条并且相对布置于导光层相对的两侧，在打开LED平面灯后，LED灯珠发光的同时产生热量，导光层在受热后会向四周膨胀，从而会挤压到两侧LED灯条上的LED灯珠，造成LED灯珠的不良损坏，缩短整个LED平面灯的使用寿命；
三、导光层由于工艺的问题，并不适合做大尺寸的，在制造大型化LED平面灯时，其导光层只能采用拼接的方式，但是这种拼接导光层的方式存在下述缺陷：在导光板的拼接缝处会出现由于漏光和光线不均造成的光缝，不仅影响整个平面灯的美观性，也影响平面灯的 发光均匀性，这一缺陷影响了大型化LED平面灯市场的进一步发展，成为制约其市场占有率提升的主要原因。
还具有光源与灯做成整体，光源损坏，不易更换，更换成本高；光线均匀性不佳、利用效率不理想等缺点。
发明内容
本发明主要解决的技术问题是提供一种平面灯，缓冲层可以是吸塑产品；具有缓冲防变形功能；可以采用楔形导光层的单侧进光加缓冲材料；且扩散层具有变色和防刮伤导光层等功能，另通过拼接式导光层使其适用于大型平面灯，且发光均匀，成本低、结构设计科学和易于实施等。
为解决上述技术问题，本发明采用的一个技术方案是：提供一种平面灯，包括导光层、反射层、扩散层、缓冲层和背板，所述导光层具有相对的两个表面且分别为背面和出光面，所述反射层位于所述导光层的背面，所述扩散层位于所述导光层的出光面，所述缓冲层位于所述背板和所述反射层之间，所述反射层与所述导光层之间具有若干导光点；
还包括光源和外框，所述扩散层、所述导光层、所述反射层、所述缓冲层和所述背板皆固定于外框内，且所述光源的入射点位于所述导光层的侧边；
所述背板、所述导光层、所述反射层、所述缓冲层和所述扩散层组成的叠构为平板状。
进一步地说，所述缓冲层是吸塑缓冲层，且所述吸塑缓冲层是由凸部和凹部相连排布构成的吸塑产品。
进一步地说，所述导光层是截面为直角梯形的楔形导光层，导光层厚的一侧为进光侧，所述进光侧设有LED灯条，导光层薄的一侧设有缓冲材料。
进一步地说，所述缓冲层的厚度为0.3-15mm。
进一步地说，实现所述背板、所述导光层、所述反射层、所述缓冲层和所述扩散层组成的叠构为平板状的结构是下述三种结构中的一种：
一、所述导光层、所述缓冲层、所述反射层和所述背板皆为平板状，所述缓冲层平行于所述背板，所述导光层平行于所述缓冲层；
二、所述导光层是截面为直角梯形的楔形导光层，所述缓冲层是截面为直角梯形的楔形缓冲层，且所述导光层的背面为第一斜面，所述缓冲层靠近所述反射层的一面为第二斜面，所述第一斜面与所述第二斜面平行，所述反射层位于所述第一斜面与所述第二述斜面之间，所述背板和所述反射层皆为平板状；
三、所述导光层是截面为直角梯形的楔形导光层，所述背板是截面为直角梯形的楔形板，且所述导光层的背面为第一斜面，所述背板的内面为第二斜面，所述第一斜面和所述第二斜面平行，所述缓冲层和所述反射层皆为平板状。
进一步地说，所述扩散层包括第一扩散单层和第二扩散单层，所述第一扩散单层具有相对的两个表面且分别为所述扩散层的入光面和第一叠合面，所述第二扩散单层具有相对的两 个表面且分别为所述扩散层的出光面和第二叠合面，所述第一扩散单层的第一叠合面和所述第二扩散单层的第二叠合面相互叠合，所述第一扩散单层的入光面与所述导光层的出光面接触，所述第一扩散单层的硬度小于所述第二扩散单层的硬度。
进一步地说，所述扩散层为下列三种结构中的一种：
一、所述第一扩散单层和所述第二扩散单层中之一为有色层；
二、所述第一扩散单层和所述第二扩散单层皆为有色层；
三、所述第一扩散单层和所述第二扩散单层皆为本色层，还包括透光有色层，所述透光有色层位于所述第一扩散单层和所述第二扩散单层之间。
进一步地说，所述光源是位于导光层侧面处的两条LED灯条，所述导光层为方片状，所述导光层具有相对的背面和出光面以及四个侧面，所述导光层的背面具有多个导光点，两条所述LED灯条分别设置于所述导光层的一对相邻的侧面处，所述导光层的另一对相邻侧面处设置有缓冲材料。
进一步地说，所述导光点的排布结构是以所述一对相邻的侧面的交点为起始点并且沿着导光层的背面逐渐增加导光点的单位覆盖面积。
进一步地说，所述光源位于外框内并且位于导光层的侧面，所述外框和所述背板上两者至少之一开设有能够插入和取出光源的插槽。
进一步地说，外框上且位于所述导光层的侧面预留有导入光线的进光口。
进一步地说，所述导光层是拼接式导光层：所述导光层由多块位于同一平面上的导光板拼接而成，所述反射层紧密叠合于所述导光层的背面，所述反射层和所述导光层的接触面上具有导光点，所述扩散层距离所述导光层1-3厘米。
进一步地说，还包括玻璃板，所述玻璃板与所述反射层相叠合的一面为背面且另一面为正面，所述玻璃板的背面形成有若干导光点，且所述玻璃板的正面为凹凸不平的粗糙表面，所述玻璃板构成一体化的导光层和扩散层。
进一步地说，所述导光层为中央导光层，还包括侧边导光层，所述中央导光层具有背面、与背面相对的出光面以及位于背面和出光面之间的侧面，所述中央导光层的背面具有导光点，所述侧边导光层位于所述中央导光层的侧面，所述侧边导光层具有与中央导光层的背面平行的后表面、与后表面相对的前表面、与所述中央导光层的侧面相对的内侧面以及与内侧面相对的外侧面，所述侧边导光层的内侧面与所述中央导光层的侧面相接触，所述侧边导光层的外侧面具有导光点，光源设置于侧边导光层处，光源由侧边导光层的内、外侧面之间入射且沿侧边导光层的长度方向入射。
进一步地说，所述导光点为下列结构中的一种：
一、所述导光点位于所述导光层的背面；
二、所述导光点位于所述反射层上且朝向所述导光层的一面；
三、还设有透明膜，所述导光点印刷于所述透明膜，所述透明膜粘附于所述导光层的背面；
四、还设有透明膜，所述导光点印刷于所述透明膜，所述透明膜粘附于所述反射层的反射面。
进一步地说，所述导光点为凸出网点或内凹网点。
进一步地说，所述导光点由油墨丝网印刷、涂布、热压、激光打点或直接成型在所述导光层的背面的点或线构成。
进一步地说，所述导光点的排布结构为以下三种排布结构中的一种：
一、所述导光点的间距相同且导光点的尺寸逐渐增大；
二、所述导光点的间距逐渐增大且导光点的尺寸相同；
三、所述导光点的间距和尺寸皆逐渐增大。
进一步地说，所述导光点的形状为菱形、正五边形、正三角形、圆形、正六边形、椭圆形或正八边形。
进一步地说，所述吸塑缓冲层为PVC层、PET层、PP层、PE层、PMMA层、PC层或PS层。
进一步地说，所述导光层为玻璃层或透明塑料层，所述透明塑料层为PMMA层、PC层、GPPS层或PET层。
进一步地说，所述外框为金属外框，所述金属外框呈矩形，所述金属外框由一整根金属型材折弯并焊接而成，所述金属型材具有相互垂直且一体成型的第一面和第二面，所述第一面是连续的长条状，所述第二面是具有四个切口的断开的长条状，每个所述切口相同且是呈顶角为90°的等腰三角形状，四个所述切口将所述第二面分为五个梯形面，所述金属型材于四个切口处弯折并且首尾相接构成矩形的金属外框，且所述金属型材的第一面上与四个切口相对应的位置被弯折后构成圆角，所述金属型材的第二面的相邻梯形面之间以及首尾相接的梯形面之间于腰部处焊接，所述金属型材的第一面构成所述金属外框的侧框面且四个所述圆角构成金属外框的四个角，所述金属型材的第二面构成所述金属外框的前端承载面。
进一步地说，所述外框为塑料外框，所述塑料外框和所述扩散层两者一体成型为塑料外罩，所述扩散层于其边缘处一体连接于所述塑料外框的前端。
进一步地说，所述光源为LED、OLED或激光。
进一步地说，所述导光层的侧面上除了光源所在部位之外皆设有反射片。
较佳的是，所述光源于导光层的侧面入射，所述平面灯内具有长余辉材料；
所述平面灯内具有长余辉材料的结构是：所述反射层和所述导光层之间以及所述导光层和所述扩散层之间两者至少之一设有长余辉透光塑料板。
优选的是，所述长余辉透光塑料板是表面涂有长余辉涂层的透光塑料片，所述透光塑料片是原料内添加长余辉材料后成型的长余辉透光塑料片，所述透光塑料片具有光线的入射面及与入射面相对的出射面，所述入射面和出射面两者至少之一上覆盖长余辉涂层，将透光塑料片上长余辉涂层所在的面称之为涂布面，所述透光塑料片上的长余辉涂层是下述四种结构中的一种：
一、同一种颜色的长余辉涂层覆盖满所述涂布面；
二、所述涂布面分为至少两个区域，每个区域内对应覆盖一种颜色的长余辉涂层，不同的区域内覆盖不同种颜色的长余辉涂层构成指示图形；
三、所述涂布面分为暴露涂布面的裸区和覆盖长余辉涂层的覆盖区，所述长余辉涂层覆盖满所述覆盖区构成指示图形；
四、所述长余辉涂层具有至少两层，至少所述两层长余辉涂层的颜色不同并且涂布范围不同构成指示图形。
进一步地说，还包括安装顶壳，所述安装顶壳上具有固定装置，所述固定装置能够将所述安装顶壳固定于吊顶上，所述外框可拆卸地连接于所述安装顶壳。
进一步地说，所述固定装置为卡簧。
进一步地说，所述第一扩散单层为PS层、PMMA层、PC层或PET层，所述第二扩散单层为PP层或PE层。
进一步地说，所述缓冲材料是沿着导光层的侧面连续分布的条形的缓冲材料条或是沿着导光层的侧面间断分布的点状的缓冲材料块。
进一步地说，所述缓冲材料为弹簧、EVA缓冲材料、EPS缓冲材料、EPP缓冲材料、EPE缓冲材料或EPO缓冲材料。
进一步地说，所述LED灯条位于所述外框与所述导光层之间，所述缓冲材料位于所述外框与所述导光层之间。
进一步地说，所述缓冲材料贴于所述导光层的侧面或外框的内侧面。
进一步地说，所述外框具有侧框面以及位于侧框面前端的前端承载面，所述背板位于缓冲层的背面并且固定于所述外框的后端，所述插槽开设于所述背板的边缘处以及所述外框的侧框面和前端承载面中的至少之一。
进一步地说，所述玻璃板的正面是经打磨处理后形成的磨砂面。
进一步地说，所述玻璃板的正面是经药水侵蚀后形成的玉砂面。
进一步地说，所述中央导光层为矩形，并且至少一个所述侧面上设有所述侧边导光层。
进一步地说，所述中央导光层的四个侧面上都设有所述侧边导光层，四个所述侧面上的侧边导光层连接成一圈，并且一个侧面上的侧边导光层的端部设有所述光源。
进一步地说，所述光源内嵌于所述侧边导光层。
进一步地说，所述侧边导光层的内侧面与其所在的中央导光层的侧面大小相同。
进一步地说，所述侧边导光层的后表面覆盖有反射层，所述侧边导光层的前表面覆盖有反射层。
本发明的有益效果是：本发明的优点至少具有以下几点：
一、本发明包括导光层、反射层、扩散层、缓冲层和背板，由于在背板和反射层之间采用了缓冲层，不仅具有缓冲热胀冷缩时的变形功能，而且由于缓冲层材质较薄，有利于提升散热效果，使产品具有使用寿命长的优点，还能够在运输过程中具有缓冲减震的效果，可有效避免在运输过程中损坏，方便运输；
二、由于本发明的缓冲层可以是由凸部和凹部相连排布构成的吸塑产品，因而缓冲效果更好，又因其采用吸塑工艺，故比较节省材料，且质轻，大大节约材料成本；
三、本发明的导光层可以是截面为直角梯形的楔形导光层，导光层厚的一侧为进光侧，进光侧设有LED灯条，导光层薄的一侧设有缓冲材料，LED灯条发热时，使导光层整体向缓冲材料方向扩张，而缓冲材料也发生内凹或收缩的弹性形变来吸收导光层的受热膨胀变形，从而避免导光层挤压LED灯珠，杜绝因导光层受热膨胀变形而导致的LED灯珠损坏，可以有效提升平面光源的使用寿命；
四、本发明的导光层可以是截面为直角梯形的楔形导光层，此时缓冲层是截面为直角梯形的楔形缓冲层或者背板是截面为直角梯形的楔形板，叠合后，依然组成平板状，同样适用于LED平面灯，适用性强，且直角梯形结构的导光效率更高，在同等导光效率下，直角梯形的导光层结构更加节约导光层的材料，相较于传统板状的导光层结构可以节约三分之一的材料，更符合国家节能降耗政策，也有利于降低产品成本；
五、本发明的扩散层可以包括第一扩散单层和第二扩散单层，第一扩散单层与导光层接触，且第一扩散单层的硬度小于第二扩散单层的硬度，由于靠近导光层的一侧即第一扩散单层采用硬度较低的软材质，可以有效避免使导光层出光面摩擦受损而造成导光层报废的问题，远离导光层的另一侧采用硬度较高的材质，不易变形，可以提供较佳的平整度和良好的扩散防眩光效果；
且，第一扩散单层和第二扩散单层中至少之一为有色层，或者二者之间另设有一透光有色层，可以做多层不同颜色的变色扩散层，提高产品的美观度，产生有色光线，个性化设计感强；
六、本发明的灯条可以设置在导光层的一对相邻的侧面，且另一对相邻侧面处设有缓冲材料，在导光层受热时，由于在设置有缓冲材料方向受到的阻力较设置有LED灯条方向小，使导光层整体向缓冲材料方向扩张，而缓冲材料也发生内凹或收缩的弹性形变来吸收导光层的受热膨胀变形，从而避免导光层挤压LED灯珠，杜绝因导光层受热膨胀变形而导致的LED灯珠损坏，可以有效提升LED平面光源的使用寿命；在导光层不受热时，导光层变冷回缩，缓冲材料也随之恢复原状；导光层上导光点的排布结构，能使LED灯珠发出的光线通过导光层后均匀的发光；反射层将光线反射回导光层，提高光的使用效率；
七、本发明可以是光源位于外框内并且位于导光层的侧面，外框和背板上两者至少之一开设有能够插入和取出光源的插槽，外框、反射层、导光层、扩散层以及背板构成统一化生产的灯体结构，光源插槽插入灯体内，通过统一化生产、统一化尺寸和外形的灯体结构插装上不同功率的光源组装成不同功率的平面灯，实现了在不拆开灯体的情况下安装或者更换光源，方便了平面灯的维修以及功率的更换，也实现了各种功率平面灯的统一化生产、销售和使用，打破了平面灯的光源于生产时固定封装于灯体内、维修时需要拆开平面灯的传统思想及弊端，是平面灯生产、销售及使用的一大突破；
八、本发明可以是外框上且位于导光层的侧面预留有导入光线的进光口，外接光源可以进入，比如外来光源为太阳光，通过聚光元件聚光后再经过导光缆和进光口将光导入灯内，将太阳光充分利用，实现平面灯的光源的多元化和市场需求；
九、本发明的导光层可以是由多块导光板拼接而成，扩散层和导光层之间存在1-3厘米的距离，正是由于存在这1-3厘米的空间，能够扩散导光板拼接缝射出的光线再经过扩散层进一步扩散后，能够达到完全看不见导光板拼接缝处异样的效果，实现了大型平面灯发光均匀、美观的目的，而且成本低、易于实施；
十、本发明的平面灯可以包括玻璃板，玻璃板与反射层相叠合的一面为背面且另一面为正面，玻璃板的背面形成有若干导光点，且玻璃板的正面为凹凸不平的粗糙表面，玻璃板构成一体化的导光层和扩散层，当光线射到位于玻璃板背面上的各个导光点时，反射光会往各个角度扩散，并由玻璃板正面射出，可以将线光源转化为面光源，反射层能够将玻璃板底部露出的光反射回玻璃板中，用来提高光的使用效率，由于玻璃板的正面是凹凸不平的粗糙表面，因此能够有效防止眩光，替代了传统的扩散层，因此本发明的LED平面灯能够发出均匀而柔和的光，且发光效率高；
而且相对于现有技术采用扩散层与亚克力材质导光层的高成本而言，本发明导光层采用玻璃板而且玻璃板正面同时具有光扩散功能，因此不仅简化了结构，而且成本较低；
十一、本发明的导光层可以为中央导光层，还包括侧边导光层，中央导光层的背面具有导光点，侧边导光层位于中央导光层的侧面，侧边导光层的内侧面与中央导光层的侧面相接触且外侧面具有导光点，光源设置于侧边导光层处，光源由侧边导光层的内、外侧面之间入射且沿侧边导光层的长度方向入射，经过侧边导光层一次导光后由侧边导光层的内侧面均匀射入中央导光层，一次导光后的光线再经过中央导光层二次导光后由中央导光层的出光面均匀射出，这种导光结构比传统导光层所产生的面光源更加均匀，而且正是由于此种二次导光结构的支持，能够实现将单个大功率光源转化为面光源，从而替代传统采用LED灯条经过导光层导光后转化为面光源的结构，是平面灯发展的一大突破，为平面灯发展开启了新的里程碑。
上述说明仅是本发明技术方案的概述，为了能够更清楚了解本发明的技术手段，并可依照说明书的内容予以实施，以下以本发明的较佳实施例并配合附图详细说明如后。
附图说明
图1是本发明的结构示意图(以光源位于外框内为例)；
图2是本发明的吸塑缓冲层的剖面图；
图3是本发明的吸塑缓冲层的俯视图；
图4是本发明的实施例1的结构示意图(以缓冲层是截面为直角梯形的楔形缓冲层为例)；
图5是本发明的实施例2的一结构示意图；
图6是本发明的实施例2的又一结构示意图；
图7是本发明的实施例3的扩散层的结构示意图之一(不含透光有色层)；
图8是本发明的实施例3的扩散层的结构示意图之二(含透光有色层)；
图9是本发明的实施例4的光学结构的示意图；
图10是本发明的实施例4的导光点的一种排布结构示意图(以圆形导光点为例，导光点间距相同且导光点的尺寸逐渐增大为例)；
图11是本发明的实施例5的结构示意图之一(以插槽开设于外框的后框面为例)；
图12是本发明的实施例5的结构示意图之二(以插槽开设于背板为例)；
图13是本发明的实施例6的结构示意图(预留有进光口)；
图14是本发明的实施例7的结构示意图；
图15是本发明的实施例8的结构示意图；
图16是本发明的实施例9的导光结构的俯视示意图(以中央导光层为矩形且仅有一侧面设有侧边导光层为例)；
图17是本发明的实施例10的整体结构示意图；
图18是本发明的实施例11的金属型材的结构示意图；
图19是本发明的实施例11的金属外框的结构示意图；
图20是本发明的实施例12的塑料外罩的结构示意图；
附图中各部分标记如下：
导光层1、反射层2、扩散层3、缓冲层4、导光点5、凸部41、凹部42、背板6、外框7、第一扩散单层31、第二扩散单层32、透光有色层33、第二斜面8、缓冲材料9、插槽10、进光口11、导光板12、玻璃板13、中央导光层14、侧边导光层15、光源16、第一面71、第二面72、切口73、圆角74、安装顶壳17、固定装置18、LED灯条19和第一斜面20。
具体实施方式
以下通过特定的具体实施例说明本发明的具体实施方式，本领域技术人员可由本说明书所揭示的内容轻易地了解本发明的优点及功效。本发明也可以其它不同的方式予以实施，即，在不背离本发明所揭示的范畴下，能予不同的修饰与改变。
一种平面灯，如图1所示，包括导光层1、反射层2、扩散层3、缓冲层4和背板6，所述导光层1具有相对的两个表面且分别为背面和出光面，所述反射层2位于所述导光层1的背面，所述扩散层3位于所述导光层1的出光面，所述缓冲层4位于所述背板6和所述反射层之间，所述反射层与所述导光层之间具有若干导光点5；
还包括光源16和外框7，所述扩散层3、所述导光层1、所述反射层2、所述缓冲层4和所述背板6皆固定于外框内，且所述光源16的入射点位于所述导光层的侧边；
所述背板、所述导光层、所述反射层、所述缓冲层和所述扩散层组成的叠构为平板状。
所述缓冲层4是吸塑缓冲层，且所述吸塑缓冲层是由凸部41和凹部42相连排布构成的吸塑产品，如图2和图3所示，所述缓冲层也可以为非吸塑产品的缓冲材料，比如弹簧、EVA(乙烯-醋酸乙烯共聚物)缓冲材料、EPP(发泡聚丙烯)缓冲材料、EPE(可发性聚乙烯)缓冲材料或EPO(泡聚苯乙烯聚乙烯混合体)缓冲材料，但不限于此。
优选的，所述缓冲层4的厚度为0.3-15mm。
所述吸塑缓冲层为PVC(聚氯乙烯材料)层、PET(聚对苯二甲酸乙二醇酯)层、PP(聚丙烯)层、PE(聚乙烯)层、PMMA(聚甲基丙烯酸甲酯)层、PC(聚碳酸酯)层、PS(聚苯乙烯)层或其它材质的塑料层。所述PS层包括但不限于普通聚苯乙烯(GPPS)、高抗冲聚苯乙烯(HIPS)、可发性聚苯乙烯(EPS)和茂金属聚苯乙烯(SPS)；所述PE层包括但不限于高密度聚乙烯(HDPE)和低密度聚乙烯(LDPE)。
由于吸塑缓冲层是真空吸附于模具表面，冷却后成型的，工艺简单，易加工；吸塑缓冲层可以设计不同的花纹图案，更美观。
实施例1：一种平面灯，如图4所示，所述导光层是截面为直角梯形的楔形导光层，导光层厚的一侧为进光侧，所述进光侧设有LED灯条19，导光层薄的一侧设有缓冲材料9。其中，缓冲层或背板的截面也为直角梯形，保证所述背板、所述导光层、所述反射层和所述缓冲层组成的叠构为平板状即可。
实施例2:一种平面灯，实现所述背板、所述导光层、所述反射层、所述缓冲层和所述扩散层组成的叠构为平板状的结构是下述三种结构中的一种：
一、所述导光层1、所述缓冲层4、所述反射层2和所述背板6皆为平板状，如图1所示；
二、所述导光层1是截面为直角梯形的楔形导光层，所述缓冲层4是截面为直角梯形的楔形缓冲层，且所述导光层1的背面为第一斜面20，所述缓冲层4靠近所述反射层的一面为第二斜面8，所述第一斜面与所述第二斜面平行，所述反射层位于所述第一斜面与所述第二述斜面之间，所述背板和所述反射层皆为平板状，如图5所示；
三、所述导光层1是截面为直角梯形的楔形导光层，所述背板6是截面为直角梯形的楔形板，且所述导光层的背面为第一斜面20，所述背板的内面为第二斜面8，所述第一斜面和所述第二斜面平行，所述缓冲层和所述反射层皆为平板状，如图6所示。
所述反射层2、所述导光层1和所述扩散层3为三层共挤或双层共挤。
实施例3：如图7和图8所示，与实施例1具有类似的结构不同之处在于:所述扩散层3包括第一扩散单层31和第二扩散单层32，所述第一扩散单层31具有相对的两个表面且分别为所述扩散层的入光面和第一叠合面，所述第二扩散单层32具有相对的两个表面且分别为所述扩散层的出光面和第二叠合面，所述第一扩散单层31的第一叠合面和所述第二扩散单层32的第二叠合面相互叠合，所述第一扩散单层31的入光面与所述导光层的出光面接触，所述第一扩散单层31的硬度小于所述第二扩散单层32的硬度。
所述扩散层为下列三种结构中的一种：
一、所述第一扩散单层31和所述第二扩散单层32中之一为有色层，如图7所示；
二、所述第一扩散单层31和所述第二扩散单层32皆为有色层；
三、所述第一扩散单层31和所述第二扩散单层32皆为本色层，还包括透光有色层33，所述透光有色层位于所述第一扩散单层和所述第二扩散单层之间，如图8所示。
所述第一扩散单层31为PS层、PMMA层、PC层或PET层，所述第二扩散单层为PP层或PE层。
本发明的靠近导光层的第一扩散单层采用PP等较软的材质，遮蔽性较高，可有效减少导光层网点的能见度，提高产品美观度及导光层良率，远离导光层的第二扩散单层采用硬度较高的PS等材质，能够提供更高的光效以及刚性。
所述扩散层为UGR(统一眩光值)<19的扩散层。
所述扩散层的加工工艺可以为多层挤出、淋膜工艺或多层复合工艺，但不限于此。
实施例4：如图9和图10所示，所述光源是位于导光层侧面处的两条LED灯条19，所述导光层1为方片状，所述导光层1具有相对的背面和出光面以及四个侧面，所述导光层的背面具有多个导光点5，两条所述LED灯条分别设置于所述导光层1的一对相邻的侧面处，所述导光层的另一对相邻侧面处设置有缓冲材料9。
所述缓冲材料9是沿着导光层的侧面连续分布的条形的缓冲材料条或是沿着导光层的侧面间断分布的点状的缓冲材料块。
所述缓冲材料9为弹簧、EVA(乙烯-醋酸乙烯共聚物)缓冲材料、EPS(可发性聚苯乙烯板)缓冲材料、EPP(发泡聚丙烯)缓冲材料、EPE(可发性聚乙烯)缓冲材料或EPO(泡聚苯乙烯聚乙烯混合体)缓冲材料。
所述LED灯条19位于所述外框7与所述导光层1之间，所述缓冲材料9位于所述外框7与所述导光层1之间。
所述缓冲材料9贴于所述导光层的侧面或外框的内侧面。
所述导光点5的排布结构为以下三种排布结构中的一种：
一、所述导光点的间距相同且导光点的尺寸逐渐增大，如图9所示；
二、所述导光点的间距逐渐增大且导光点的尺寸相同；
三、所述导光点的间距和尺寸皆逐渐增大。
实施例5：如图11和图12所示，所述光源16位于外框内并且位于导光层1的侧面，所述外框7和所述背板上两者至少之一开设有能够插入和取出光源的插槽10。其中图11的插槽开设于外框的后框面，图12的插槽开设于背板6。
所述外框7具有侧框面以及位于侧框面前端的前端承载面，所述背板6位于缓冲层4的背面并且固定于所述外框的后端，所述插槽开设于所述背板的边缘处以及所述外框的侧框面和前端承载面中的至少之一。
实施例6：如图13所示，外框上且位于所述导光层1的侧面预留有导入光线的进光口11。
优选的，进光口内插入导光缆，所述导光缆的一端与所述导光层的侧面连接，所述导光 缆的另一端与外来光源连接，比如外来光源为太阳光，通过聚光元件聚光后与导光缆连接。
实施例7：如图14所示，所述导光层1是拼接式导光层：所述导光层由多块位于同一平面上的导光板12拼接而成，所述反射层2紧密叠合于所述导光层的背面，所述反射层和所述导光层的接触面上具有导光点，所述扩散层3距所述导光层1的距离为1-3厘米。
优选的，所述扩散层距离所述导光层2厘米。
实施例8：如图15所示，还包括玻璃板13，所述玻璃板13与所述反射层2相叠合的一面为背面且另一面为正面，所述玻璃板13的背面形成有若干导光点5，且所述玻璃板13的正面为凹凸不平的粗糙表面，所述玻璃板构成一体化的导光层1和扩散层3。
所述玻璃板13的正面是经打磨处理后形成的磨砂面。
或者所述玻璃板13的正面是经药水侵蚀后形成的玉砂面。
实施例9：如图16所示，所述导光层为中央导光层14，还包括侧边导光层15，所述中央导光层14具有背面、与背面相对的出光面以及位于背面和出光面之间的侧面，所述中央导光层的背面具有导光点5，所述侧边导光层15位于所述中央导光层14的侧面，所述侧边导光层15具有与中央导光层的背面平行的后表面、与后表面相对的前表面、与所述中央导光层的侧面相对的内侧面以及与内侧面相对的外侧面，所述侧边导光层的内侧面与所述中央导光层的侧面相接触，所述侧边导光层15的外侧面具有导光点5，光源设置于侧边导光层处，光源由侧边导光层的内、外侧面之间入射且沿侧边导光层的长度方向入射。
所述中央导光层14为矩形，并且至少一个所述侧面上设有所述侧边导光层，如图16所示。
所述中央导光层14的四个侧面上都设有所述侧边导光层15，四个所述侧面上的侧边导光层连接成一圈，并且一个侧面上的侧边导光层的端部设有所述光源。
所述光源16内嵌于所述侧边导光层15。
所述侧边导光层的内侧面与其所在的中央导光层的侧面大小相同。
所述侧边导光层的后表面覆盖有反射层，所述侧边导光层的前表面覆盖有反射层。
实施例10：如图17所示，还包括安装顶壳17，所述安装顶壳上具有固定装置18，所述固定装置能够将所述安装顶壳固定于吊顶上，所述外框7可拆卸地连接于所述安装顶壳。
优选的，所述固定装置18为卡簧。
由于安装于吊顶的安装顶壳和可拆卸连接于安装顶壳上的外框两部分分体构成，因此，安装时，只需先将安装顶壳固定于吊顶即可，较之传统一体式的LED平面灯，降低了安装难度，更值得一提的是，传统一体式LED平面灯损坏时需要将整个灯具拆卸下来，极易损坏吊顶，但是本发明只需将LED平面灯除外框的部分从安装顶壳上拆卸下来即可，完全不会损坏吊顶，十分便于灯具的维修及更换。
实施例11：如图18和图19所示，所述外框7为金属外框，所述金属外框呈矩形，所述金属外框由一整根金属型材折弯并焊接而成，所述金属型材具有相互垂直且一体成型的第一面71和第二面72，所述第一面是连续的长条状，所述第二面是具有四个切口73的断开的长 条状，每个所述切口相同且是呈顶角为90°的等腰三角形状，四个所述切口将所述第二面分为五个梯形面，所述金属型材于四个切口处弯折并且首尾相接构成矩形的金属外框，且所述金属型材的第一面上与四个切口相对应的位置被弯折后构成圆角74，所述金属型材的第二面的相邻梯形面之间以及首尾相接的梯形面之间于腰部处焊接，所述金属型材的第一面构成所述金属外框的侧框面且四个所述圆角构成金属外框的四个角，所述金属型材的第二面构成所述金属外框的前端承载面。
该金属外框的四个角是由型材弯折形成的圆角，具有光滑、不伤手的优点，使得该金属外框既安全可靠又美观。
实施例12：如图20所示，所述外框7为塑料外框，所述塑料外框和所述扩散层3两者一体成型为塑料外罩，所述扩散层于其边缘处一体连接于所述塑料外框的前端。
所述塑料外框还具有前承载面，所述前承载面的外周边与所述侧壁的前端一体连接，所述前端承载面的内周边与所述塑料扩散层的边缘一体连接。
由外框和扩散层一体成型而成，因此具有加工简便、成本低、组装方便等优点；而且由于外框和扩散层是一体的，外框可以不再具有前端承载面，因此，省略前端承载面后可以增加平面灯的出光面积。
实施例12：一种平面灯，所述光源16于导光层1的侧面入射，所述平面灯内具有长余辉材料。
优选的是，所述平面灯内具有长余辉材料的结构是：所述反射层2和所述导光层1之间以及所述导光层1和所述扩散层3之间两者至少之一设有长余辉透光塑料板；
所述长余辉透光塑料板是表面涂有长余辉涂层的透光塑料片，所述透光塑料片是原料内添加长余辉材料后成型的长余辉透光塑料片，所述透光塑料片具有光线的入射面及与入射面相对的出射面，所述入射面和出射面两者至少之一上覆盖长余辉涂层，将透光塑料片上长余辉涂层所在的面称之为涂布面，所述透光塑料片上的长余辉涂层是下述四种结构中的一种：
一、同一种颜色的长余辉涂层覆盖满所述涂布面；
二、所述涂布面分为至少两个区域，每个区域内对应覆盖一种颜色的长余辉涂层，不同的区域内覆盖不同种颜色的长余辉涂层构成指示图形；
三、所述涂布面分为暴露涂布面的裸区和覆盖长余辉涂层的覆盖区，所述长余辉涂层覆盖满所述覆盖区构成指示图形；
四、所述长余辉涂层具有至少两层，至少所述两层长余辉涂层的颜色不同并且涂布范围不同构成指示图形。
因此，在有光线(包括平面灯内光源和自然光)入射的时候，平面灯内的长余辉材料可以存储光，在断电后，平面灯内的长余辉材料能够缓慢释放光线，提供照明或指示灯作用，例如用于宾馆、办公楼等公共场所或家庭卫生间等场所停电后或者夜晚关灯后的低度照明，或者断电后发出的光构成提示卫生间、安全出口等场所的图案、字母和箭头，本发明的LED平面是一种绿色节能灯具。
另，实施例中，所述导光点5为下列结构中的一种：
一、所述导光点位于所述导光层的背面；
二、所述导光点位于所述反射层上且朝向所述导光层的一面；
三、还设有透明膜，所述导光点印刷于所述透明膜，所述透明膜粘附于所述导光层的背面；
四、还设有透明膜，所述导光点印刷于所述透明膜，所述透明膜粘附于所述反射层的反射面。
所述导光点5为凸出网点或内凹网点。
所述导光点5由油墨丝网印刷、涂布、热压、激光打点或直接成型在所述导光层的背面的点或线构成。
优选的，所述导光点5是以下结构中的一种：
一、所述导光点是由丝网印刷或涂布在导光层的背面的扩散剂物质构成的凸出高度为0.01-0.2mm的凸出网点；
二、所述导光点是由模具射出转印到导光层的背面形成的凸出高度为0.001-0.03mm的凸出网点；
三、所述导光点是通过热压方式在导光层的背面形成的内凹深度为0.01-0.2mm的内凹网点；
四、所述导光点是通过激光加工在导光层的背面形成的内凹深度为0.05-0.3mm的内凹网点。
所述导光点5的形状为菱形、正五边形、正三角形、圆形、正六边形、椭圆形或正八边形。
所述导光层1为玻璃层或透明塑料层，所述透明塑料层为PMMA层、PC层、GPPS层或PET层。
所述光源16为LED、OLED(有机发光二极管)或激光。
所述导光层1的侧面上除了光源所在部位之外皆设有反射片。
以上所述仅为本发明的实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (12)

  1. 一种平面灯，其特征在于：包括导光层、反射层、扩散层、缓冲层和背板，所述导光层具有相对的两个表面且分别为背面和出光面，所述反射层位于所述导光层的背面，所述扩散层位于所述导光层的出光面，所述缓冲层位于所述背板和所述反射层之间，所述反射层与所述导光层之间具有若干导光点；
    还包括光源和外框，所述扩散层、所述导光层、所述反射层、所述缓冲层和所述背板皆固定于外框内，且所述光源的入射点位于所述导光层的侧边；
    所述背板、所述导光层、所述反射层、所述缓冲层和所述扩散层组成的叠构为平板状。
  2. 根据权利要求1所述的一种平面灯，其特征在于：所述缓冲层是吸塑缓冲层，且所述吸塑缓冲层是由凸部和凹部相连排布构成的吸塑产品。
  3. 根据权利要求1所述的一种平面灯，其特征在于：所述导光层是截面为直角梯形的楔形导光层，导光层厚的一侧为进光侧，所述进光侧设有LED灯条，导光层薄的一侧设有缓冲材料。
  4. 根据权利要求1所述的一种平面灯，其特征在于：实现所述背板、所述导光层、所述反射层、所述缓冲层和所述扩散层组成的叠构为平板状的结构是下述三种结构中的一种：
    一、所述导光层、所述缓冲层、所述反射层和所述背板皆为平板状；
    二、所述导光层是截面为直角梯形的楔形导光层，所述缓冲层是截面为直角梯形的楔形缓冲层，且所述导光层的背面为第一斜面，所述缓冲层靠近所述反射层的一面为第二斜面，所述第一斜面与所述第二斜面平行，所述反射层位于所述第一斜面与所述第二述斜面之间，所述背板和所述反射层皆为平板状；
    三、所述导光层是截面为直角梯形的楔形导光层，所述背板是截面为直角梯形的楔形板，且所述导光层的背面为第一斜面，所述背板的内面为第二斜面，所述第一斜面和所述第二斜面平行，所述缓冲层和所述反射层皆为平板状。
  5. 根据权利要求1所述的一种平面灯，其特征在于：所述扩散层包括第一扩散单层和第二扩散单层，所述第一扩散单层具有相对的两个表面且分别为所述扩散层的入光面和第一叠合面，所述第二扩散单层具有相对的两个表面且分别为所述扩散层的出光面和第二叠合面，所述第一扩散单层的第一叠合面和所述第二扩散单层的第二叠合面相互叠合，所述第一扩散单层的入光面与所述导光层的出光面接触，所述第一扩散单层的硬度小于所述第二扩散单层的硬度。
  6. 根据权利要求5所述的一种平面灯，其特征在于：所述扩散层为下列三种结构中的一种：
    一、所述第一扩散单层和所述第二扩散单层中之一为有色层；
    二、所述第一扩散单层和所述第二扩散单层皆为有色层；
    三、所述第一扩散单层和所述第二扩散单层皆为本色层，还包括透光有色层，所述透光有色层位于所述第一扩散单层和所述第二扩散单层之间。
  7. 根据权利要求1所述的一种平面灯，其特征在于：所述光源是位于导光层侧面处的两条LED灯条，所述导光层为方片状，所述导光层具有相对的背面和出光面以及四个侧面，所述导光层的背面具有多个导光点，两条所述LED灯条分别设置于所述导光层的一对相邻的侧面处，所述导光层的另一对相邻侧面处设置有缓冲材料。
  8. 根据权利要求1所述的一种平面灯，其特征在于：所述光源位于外框内并且位于导光层的侧面，所述外框和所述背板上两者至少之一开设有能够插入和取出光源的插槽。
  9. 根据权利要求1所述的一种平面灯，其特征在于：外框上且位于所述导光层的侧面预留有导入光线的进光口。
  10. 根据权利要求1所述的一种平面灯，其特征在于：所述导光层是拼接式导光层：所述导光层由多块位于同一平面上的导光板拼接而成，所述反射层紧密叠合于所述导光层的背面，所述反射层和所述导光层的接触面上具有导光点，所述扩散层距离所述导光层1-3厘米。
  11. 根据权利要求1所述的一种平面灯，其特征在于：还包括玻璃板，所述玻璃板与所述反射层相叠合的一面为背面且另一面为正面，所述玻璃板的背面形成有若干导光点，且所述玻璃板的正面为凹凸不平的粗糙表面，所述玻璃板构成一体化的导光层和扩散层。
  12. 根据权利要求1所述的一种平面灯，其特征在于：所述导光层为中央导光层，还包括侧边导光层，所述中央导光层具有背面、与背面相对的出光面以及位于背面和出光面之间的侧面，所述中央导光层的背面具有导光点，所述侧边导光层位于所述中央导光层的侧面，所述侧边导光层具有与中央导光层的背面平行的后表面、与后表面相对的前表面、与所述中央导光层的侧面相对的内侧面以及与内侧面相对的外侧面，所述侧边导光层的内侧面与所述中央导光层的侧面相接触，所述侧边导光层的外侧面具有导光点，光源设置于侧边导光层处，光源由侧边导光层的内、外侧面之间入射且沿侧边导光层的长度方向入射。
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