CN105953092A - Low-glare LED panel lamp capable of uniformly emitting light - Google Patents
Low-glare LED panel lamp capable of uniformly emitting light Download PDFInfo
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- CN105953092A CN105953092A CN201610473752.9A CN201610473752A CN105953092A CN 105953092 A CN105953092 A CN 105953092A CN 201610473752 A CN201610473752 A CN 201610473752A CN 105953092 A CN105953092 A CN 105953092A
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- flat lamp
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- 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
- F21V5/00—Refractors for light sources
- F21V5/08—Refractors for light sources producing an asymmetric light distribution
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- 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
- F21V21/00—Supporting, suspending, or attaching arrangements for lighting devices; Hand grips
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- 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
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
- F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
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- 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
Abstract
The invention relates to the field of panel lamps, in particular to a low-glare LED panel lamp capable of uniformly emitting light. The low-glare LED panel lamp comprises a frame body, a light source module, an optical module, a reflecting unit and a light mixing unit. The frame body provides mechanical support for the low-glare LED panel lamp capable of uniformly emitting the light. The light source module is connected with the frame body and used for converting electricity energy to luminous energy. The optical module is connected with the light source module and used for co-mixing the light emitted by the light source module to obtain the uniform light. The optical module comprises the reflecting unit used for changing the angle of the light emitted by the light source module. The light mixing unit is connected with the reflecting unit and used for adjusting the reflecting direction of the light passing through the reflecting unit. According to the scheme of the low-glare LED panel lamp capable of uniformly emitting the light, an optical system, a heat dissipation system and a light source system are combined together, and the brand-new LED panel lamp is formed. By the adoption of the scheme, the low-glare LED panel lamp capable of uniformly emitting the light is simple in structure, convenient to replace, mature in technology, good in heat dissipation effect, low in cost, convenient to produce, easy to assemble and firm in assembly, and materials are prepared conveniently.
Description
Technical field
The present invention relates to flat lamp field, particularly relate to the low dazzle LED flat lamp of a kind of uniformly light-emitting.
Background technology
Along with the progress of scientific and technological level, the quality of life of people is more and more higher.Meanwhile, along with the day by day maturation of LED technology with illumination market, illumination fields such as becoming intelligence, circulation, Shang Zhao, office, household is the most gradually segmented in illuminating lamp market.
At present luminescence class planar lamp light emitting module in office lighting side mainly uses light source to add reflective sheeting to add light guide plate and add diffuser plate three-piece and coordinate luminescence.Its technology mainly used be light guide plate on surface by laser dotting technology, by the silk-screen technology of light guide plate surface and exempt from silk-screen technology.Typical side light emitting plane lamp such as number of patent application 201110116719.8, LED flat lamp disclosed in the utility model patent of application title " LED flat lamp ", including light guide plate and the LED module that is arranged at light guide plate side, also include a placement light guide plate and the frame of LED module；One heat sink；And the locking buckle that frame and heat sink be fixed together so that light guide plate and LED module are positioned between frame and heat sink.
Along with people's raising to illumination prescription, luminescence class flat lamp in side is answered because the dazzling greatly and easily user of making of its light source incidence angle does not feels well, for this reason, it may be necessary to can uniformly light-emitting and the lamp of low glare.But due to the limitation of prior art self, so the light emission rate of side light emitting plane lamp is low, lack of homogeneity, shortcoming that type unified glare value (UGR) is high are always the insurmountable problem of current technology.According to current material and technology, the light transmittance of side active flat panel is about 80%, and uniformity is general, and UGR is generally higher than more than 22.
In sum, light emitting plane lamp manufacturing cost height is surveyed in current office, production efficiency is low, light efficiency is low, it is impossible to meet existing illumination requirement.
Summary of the invention
It is an object of the invention to provide the low dazzle LED flat lamp of a kind of uniformly light-emitting, it is intended to solve the problem that existing side light emitting plane lamp glare is high.
The present invention is achieved in that the low dazzle LED flat lamp of a kind of uniformly light-emitting, provides the framework of mechanics support including the low dazzle LED flat lamp for described uniformly light-emitting；The light source module converting electrical energy into luminous energy being connected with described framework；The light being connected with described light source module and sent by described light source module carries out being blended to obtain the optical module of uniform light；Described optical module includes the reflector element that the angle of the light sent by described light source module is changed；Be connected with described transmitter unit to the mixed light unit that will regulate through the emission of light direction of described reflector element.By adding mixed light unit it is achieved thereby that the incident illumination of the side luminescence distinctive wide-angle of class flat lamp to be converted into low-angle emergent light, thus the problem overcoming dazzle.
The further technical scheme of the present invention is: described mixed light unit includes light guide plate and diffuser plate；Described light guide plate is provided with shrinkage pool, and described shrinkage pool inwall scribbles optical material；Described diffuser plate is provided with projection.The regulation to light is achieved by arranging projection and shrinkage pool.
The further technical scheme of the present invention is: described shrinkage pool is tetragon.Shrinkage pool is irregular quadrilateral, can play more preferable light mixing effect.
The further technical scheme of the present invention is: described shrinkage pool is provided with wide-angle refracting sphere, low-angle refracting sphere, wide-angle total reflection district, low-angle total reflection district；Described wide-angle refracting sphere is 30-45 ° with the angle of horizontal plane, and described low-angle refracting sphere and horizontal plane angle are 45-60 °.Angle according to angle of incidence is made that adjustment to zones of different so that regional possesses different volume function.
The further technical scheme of the present invention is: described projection is tetragon.Projection is irregular quadrilateral, can play more preferable light mixing effect.
The further technical scheme of the present invention is: the height of described projection is 0.4-4 mm.
The further technical scheme of the present invention is: described projection includes that the first inclined plane and the second inclined plane, described first inclined plane and horizontal plane angle are 100-160 °, and described second inclined plane is 100-130 ° with the angle of described first inclined plane.Angle according to angle of incidence is made that adjustment to zones of different so that regional possesses different volume function.
The further technical scheme of the present invention is: the low dazzle LED flat lamp of described uniformly light-emitting also include being connected with described light source module and described light source module interior can be converted in self can heat conducting module.The heat energy that light source sends can be exhaled by heat conducting module, to increase safety.
The further technical scheme of the present invention is: described heat conducting module includes bond plies and the heat conductive silica gel being connected with described light source module.Bond plies and heat conductive silica gel are with low cost, are readily available.
The further technical scheme of the present invention is: described optical module also includes the base plate being connected with described framework.
The invention has the beneficial effects as follows: the low dazzle LED flat lamp of the uniformly light-emitting that this programme provides, by optical system, cooling system and light-source system are combined, constitutes brand-new LED flat lamp；This programme simple in construction, change convenience, technical maturity, good heat dissipation effect, low cost, production are got the raw materials ready conveniently, assembling is the most firm；Both save resource, and reduced production cost, improve again productivity ratio, meet specialty customer demand.
Accompanying drawing explanation
Fig. 1 is the overall appearance figure of the low dazzle LED flat lamp of the uniformly light-emitting that the embodiment of the present invention provides.
Fig. 2 is the structural blast figure of the low dazzle LED flat lamp of the uniformly light-emitting that the embodiment of the present invention provides.
Fig. 3 is the structural representation of the low dazzle LED flat lamp light guide plate of the uniformly light-emitting that the embodiment of the present invention provides.
Fig. 4 is the structural representation of the low dazzle LED flat lamp light guide plate shrinkage pool of the uniformly light-emitting that the embodiment of the present invention provides.
Fig. 5 is the structural representation of the low dazzle LED flat lamp diffuser plate of the uniformly light-emitting that the embodiment of the present invention provides.
Fig. 6 is the structural representation of the low dazzle LED flat lamp diffuser plate projection of the uniformly light-emitting that the embodiment of the present invention provides.
Fig. 7 is the index path of the low dazzle LED flat lamp mixed light unit of the uniformly light-emitting that the embodiment of the present invention provides.
Reference: framework-1；Light source module-2；Base plate-3；Reflective sheeting-4；Light guide plate-5；Shrinkage pool-51；Diffuser plate-6；Protruding-61；First inclined plane and horizontal plane angle-R1；Fillet-R2；First inclined plane and the second inclined plane angle-R3；Wide-angle refracting sphere-R4；Low-angle refracting sphere-R5；Wide-angle total reflection district-R6；Low-angle total reflection district-R7.
Detailed description of the invention
Embodiment one is as shown in figs. 1-7
Fig. 1 is the overall appearance figure of the low dazzle LED flat lamp of the uniformly light-emitting that the embodiment of the present invention provides.Framework 1 structure of the low dazzle LED flat lamp of the uniformly light-emitting that this programme provides mainly can be found out from figure.
Fig. 2 is the structural blast figure of the low dazzle LED flat lamp of the uniformly light-emitting that the embodiment of the present invention provides.The low dazzle LED flat lamp of the most described a kind of uniformly light-emitting, provides the framework 1 of mechanics support including the low dazzle LED flat lamp for described uniformly light-emitting；The light source module 2 converting electrical energy into luminous energy being connected with described framework 1；It is connected with described light source module 2 and carries out the light that described light source module 2 sends being blended to obtain the optical module of uniform light；Described optical module includes the reflector element 4 that the angle of the light sent by described light source module 2 is changed；Be connected with described transmitter unit 4 to the mixed light unit that will regulate through the emission of light direction of described reflector element, described optical module also includes the base plate 3 being connected with described framework.By adding mixed light unit it is achieved thereby that the incident illumination of the side luminescence distinctive wide-angle of class flat lamp to be converted into low-angle emergent light, thus the problem overcoming dazzle.Reflecting unit in this example is reflective sheeting 4, it is possible to use other light deflection device such as reflector etc..
The low dazzle LED flat lamp of described uniformly light-emitting also include being connected with described light source module and described light source module interior can be converted in self can heat conducting module.Described heat conducting module includes bond plies and the heat conductive silica gel being connected with described light source module.
From Fig. 2-6, visible described mixed light unit includes light guide plate 5 and diffuser plate 6；Described light guide plate 5 is provided with shrinkage pool 51, and described shrinkage pool 51 inwall scribbles optical material；Described diffuser plate 6 is provided with protruding 61.The regulation to light is achieved by arranging projection 61 and shrinkage pool 51.
Fig. 3 is the structural representation of the low dazzle LED flat lamp light guide plate of the uniformly light-emitting that the embodiment of the present invention provides.The most described shrinkage pool 51 is tetragon.Shrinkage pool is irregular quadrilateral, can play more preferable light mixing effect.Described shrinkage pool 51 is provided with wide-angle refracting sphere R4, low-angle refracting sphere R5, wide-angle total reflection district R6, low-angle total reflection district R7；Described wide-angle refracting sphere R4 is 30-45 ° with the angle of horizontal plane, and described low-angle refracting sphere R5 and horizontal plane angle are 45-60 °.Angle according to angle of incidence is made that adjustment to zones of different so that regional possesses different volume function.
In this example, the surface of light guide plate 5 is uniformly distributed 103 irregular quadrilateral shrinkage pools 51, as shown in Figure 3.Tetragon becomes irregular recessed state.Fig. 4 is the structural representation of the low dazzle LED flat lamp light guide plate shrinkage pool of the uniformly light-emitting that the embodiment of the present invention provides.Wherein the R of zone circle is trace mark, and the R of zone circle is not diameter, and the unit after numeral is millimeter.As can be seen, wide-angle refracting sphere R4=48mm, low-angle refracting sphere R5=30mm, wide-angle total reflection district R6=3mm, low-angle total reflection district R7=4mm, do not coat optical material inside specification tetragon.The light sent from both sides when light source module 2 is through light guide plate, a part of light carries out the reflection of light by back side reflective sheeting, light is guided into front, another portions of light tetragon above light guide plate becomes irregular recessed state to carry out refraction and the angular spread of light, forms horizontal 180 ° of light-out effect with longitudinally 180 °.The diameter R value that it should be noted that regional in this example is an example, actual can modify diameter as required.
Particularly, 103 irregular quadrilateral shrinkage pools 51 are distributed on described light guide plate 5, for concave shape, by this recessed portion, light incident on light source module 2 is spread apart, play the purpose of light diffusion, and corresponding to light guide plate upper concave hole 51, there is rhombus projection 61 on diffuser plate 6 accordingly, play the purpose that light draws the light in wide-angle direction in, to play the purpose of anti-dazzle.
As shown in Figure 4,103 irregular quadrilateral shrinkage pools 51 are distributed on described light guide plate 5, for irregular quadrilateral shape, the light of the reflection in light guide plate 5 is its objective is to break up, make the top outgoing from shrinkage pool 51 of a part of light, a biggest part continues to reflect in light guide plate 5, so that light uniform in whole light guide plate 5.Wide-angle refracting sphere R4=48mm as can be seen, low-angle refracting sphere R5=30mm, wide-angle total reflection district R6=3mm, low-angle total reflection district R7=4mm.
Because just from incident sideways, so, the light of wide-angle is usually from the incidence of wide-angle refracting sphere R4 region, and the principal element just causing dazzle of wide-angle, therefore, the light of wide-angle toward the middle key drawn in and be to solve glare problem.Therefore the radius in wide-angle refracting sphere R4 region is 48mm, and its inclined-plane is less with the angle theta of horizontal plane, forms a smoother region, and the span of this angle theta is 30 °-45 °.In the anaclasis that can ensure that 75 ° of-90 ° of outgoing of wide-angle of this angle enters light guide plate 5 rather than directly outgoing, thus greatly reducing the light of large angle incidence.And incide the light in light guide plate 5 in light guide plate through repeatedly reflecting and reflecting, finally will convert into low-angle emergent light.
Low-angle refracting sphere R5 district is corresponding to the light of low-angle incidence, the radius in this region is 30mm, it is 45 °-60 ° with the value of the angle φ of horizontal plane, form the region that a comparison is steep, this region is comparatively close to the light from bottom reflective sheeting 4 incidence, and the purpose in this region is to be imported on diffuser plate 6 by the low-angle light that reflective sheeting reflection comes up.The inclined-plane for this district played a major role, relatively steep because of the inclined-plane at this, with the angle of horizontal plane more than 45 °, and reflects the light come up from bottom reflective sheeting 4, when the angle of light with vertical is less than 90 ° of-φ, and the light meeting this condition will all incide at diffuser plate 6.Because the value of φ is 45 °-60 °, so the value of 90 ° of-φ is 45 °-30 °, the most all shining the light at diffuser plate 6 from this region and be low-angle light, the light in this region will not be injected human eye become dazzle from wide-angle outgoing.
The radius of wide-angle total reflection district R6 is 3mm.Wide-angle total reflection R6 region, district is a mild region, and the purpose in this region is the light of total reflection large angle incidence, substantially without the light through low-angle incidence of refraction.
Because being evenly distributed with 103 small ruts on whole light guide plate 5, each small rut is equivalent to a slight light filter, continue to be refracted in light guide plate by the light of large angle incidence, and by anaclasis incident for low-angle to diffuser plate 6, and incide the light in light guide plate 5 and continue reflect in leaded light and reflect, by reflection and the refraction of each small rut cambered surface, luminous by being converted into face from the light of light source incidence, and most light is converted into the light that low-angle is incident.
Fig. 5 is the structural representation of the low dazzle LED flat lamp diffuser plate of the uniformly light-emitting that the embodiment of the present invention provides.In addition to the shrinkage pool 51 on light guide plate 5, mixed light module is additionally provided with diffuser plate 6, and diffuser plate is provided with protruding 61.Described protruding 61 is tetragon.Because the light within light guide plate 5 is reflection and refraction, light path is complicated, although the light of major part large angle incidence can be refracted into inside light guide plate by 103 small ruts on light guide plate, but still there is a lot of uncontrollable light with the outgoing of wide-angle direction, the simple ability of regulation and control relying on light guide plate, is still unable to reach the purpose of low dazzle.Corresponding to each small rut, diffuser plate corresponding above have one little by protruding 61, this projection 61 plays the effect of refraction light, high angle scattered light uncontrollable in diffuser plate is deflected.Projection is irregular quadrilateral, can play more preferable light mixing effect.The height of described projection is 0.4
-4 mm.Described projection includes that the first inclined plane and the second inclined plane, described first inclined plane and horizontal plane angle are 100-160 °, and described second inclined plane is 100-130 ° with the angle of described first inclined plane.Angle according to angle of incidence is made that adjustment to zones of different so that regional possesses different volume function.
The effect of diffuser plate 6 is had a talk about below in conjunction with Fig. 5 Fig. 6.In this example, diffuser plate 6 surface is uniformly distributed 103 trapeziform protruding 61, such as Fig. 5, tetragon becomes irregular epirelief taper state, first inclined plane of its protrusions and horizontal plane angle R1=148 °, a diameter of 1.0mm of fillet R2, first inclined plane and the second inclined plane angle R3=116 °, when the light derived from light guide plate 5 is through diffuser plate 6, becomes irregular epirelief taper state to carry out the diffusion of light and the change of angle by tetragon above diffuser plate 6, change dazzle value.Reach the dazzle value effect less than 18.
Type unified glare value UGR is the psychological parameter that human eye is caused discomfort subjective response by the light sent for the illuminator measuring in Visual Environment, and its value can be calculated by regulation design conditions CIE type unified glare value formula.
103 boss in tetragon prismatic structure it are evenly distributed with, acting as the light deflection of large angle incidence to low-angle of this boss on flat lamp diffuser plate 6.In order to reach this purpose, realize in the following way: as shown in Figure 6, first inclined plane of protruding 61 and horizontal plane angle R1 be the span of ψ, ψ be 100 °-160 °, its optimal value is 140 °-150 °.According to the law of refraction: no*sinαi=no*sinαo, with 180 ° of-ψ for boundary angle: when light is, during with vertical line in angle incidence less than 180 ° of-ψ, all can deflect into low-angle direction；When light is with during with vertical line in angle incidence more than 180 ° of-ψ, all of light all can be refracted into adjacent little protruding 61, and through the adjacent little refraction of protruding 61, light is back into being mapped in diffuser plate 6, and re-start refraction and reflection, finally can be with the beam projecting in low-angle direction.
As shown in Figure 6, protruding 61 first inclined planes are 116 ° with the second inclined plane angle R3, and drift angle is fillet, a diameter of 1mm of fillet, and height of projection is 0.4mm-4mm, and the protruding quantity that height of projection is arranged according to size and the needs of whole face is adjusted.
Fig. 7 is the index path of the low dazzle LED flat lamp mixed light unit of the uniformly light-emitting that the embodiment of the present invention provides.Can be seen that and after mixed light module, the high angle scattered light sent from light source module is transformed into low-angle light, thus people can be allowed the most again to move dazzle.
As mentioned above, the optical system of whole face lamp is through light guide plate and the regulation of diffuser plate: light guide plate carries out just successive step and distribution to light, the light inciding inside is reflected by the little shrinkage pool of light guide plate, part low-angle light is refracted to the tetragon prismatic of diffuser plate, and major part high angle scattered light is refracted into inside light guide plate, in this way light is allocated, by light uniformly from the little shrinkage pool outgoing of whole light guide plate.Incide the refraction again of the little projection on diffuser plate of the light on diffuser plate, major part light is refracted to low-angle direction, and major part large angle incidence light is refracted to adjacent little projection, through the refraction of too small projection, in being again incident on light guide plate, carry out sub-distribution again.Uniformity of illuminance in above light-conducting system and diffusion system, whole diffusion panel reaches more than 0.95, and whole light fixture is tested, and UGR value is less than 18.
The low dazzle LED flat lamp of the uniformly light-emitting that this programme provides, by optical system, cooling system and light-source system are combined, constitutes brand-new LED flat lamp；This programme simple in construction, change convenience, technical maturity, good heat dissipation effect, low cost, production are got the raw materials ready conveniently, assembling is the most firm；Both save resource, and reduced production cost, improve again productivity ratio, meet specialty customer demand.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all any amendment, equivalent and improvement etc. made within the spirit and principles in the present invention, should be included within the scope of the present invention.
Claims (10)
1. the low dazzle LED flat lamp of a uniformly light-emitting, it is characterised in that: include the framework providing mechanics to support for the low dazzle LED flat lamp of described uniformly light-emitting；The light source module converting electrical energy into luminous energy being connected with described framework；The light being connected with described light source module and sent by described light source module carries out being blended to obtain the optical module of uniform light；Described optical module includes the reflector element that the angle of the light sent by described light source module is changed；Be connected with described transmitter unit to the mixed light unit that will regulate through the emission of light direction of described reflector element.
The low dazzle LED flat lamp of uniformly light-emitting the most according to claim 1, it is characterised in that: described mixed light unit includes light guide plate and diffuser plate；Described light guide plate is provided with shrinkage pool, and described shrinkage pool inwall scribbles optical material；Described diffuser plate is provided with projection.
The low dazzle LED flat lamp of uniformly light-emitting the most according to claim 2, it is characterised in that: described shrinkage pool is tetragon.
The low dazzle LED flat lamp of uniformly light-emitting the most according to claim 2, it is characterised in that: described shrinkage pool is provided with wide-angle refracting sphere, low-angle refracting sphere, wide-angle total reflection district, low-angle total reflection district；Described wide-angle refracting sphere is 30-45 ° with the angle of horizontal plane, and described low-angle refracting sphere and horizontal plane angle are 45-60 °.
The low dazzle LED flat lamp of uniformly light-emitting the most according to claim 3, it is characterised in that: described projection is tetragon.
The low dazzle LED flat lamp of uniformly light-emitting the most according to claim 2, it is characterised in that: the height of described projection is 0.4-4 mm.
The low dazzle LED flat lamp of uniformly light-emitting the most according to claim 2, it is characterized in that: described projection includes the first inclined plane and the second inclined plane, described first inclined plane and horizontal plane angle are 100-160 °, and described second inclined plane is 100-130 ° with the angle of described first inclined plane.
8. according to the low dazzle LED flat lamp of described uniformly light-emitting arbitrary in claim 1-7, it is characterised in that: the low dazzle LED flat lamp of described uniformly light-emitting also includes being connected with described light source module and described light source module interior can be converted into the heat conducting module of energy in self.
The low dazzle LED flat lamp of uniformly light-emitting the most according to claim 8, it is characterised in that: described heat conducting module includes bond plies and the heat conductive silica gel being connected with described light source module.
10. according to the low dazzle LED flat lamp of described uniformly light-emitting arbitrary in claim 1-7, it is characterised in that: described optical module also includes the base plate being connected with described framework.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610473752.9A CN105953092A (en) | 2016-06-24 | 2016-06-24 | Low-glare LED panel lamp capable of uniformly emitting light |
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| CN201610473752.9A CN105953092A (en) | 2016-06-24 | 2016-06-24 | Low-glare LED panel lamp capable of uniformly emitting light |
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| CN110542126A (en) * | 2019-04-26 | 2019-12-06 | 宁波丽辰电器有限公司 | Electric fireplace simulation fuel bed |
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