WO2016099195A1 - Structure de lentille de diffusion et dispositif d'émission de lumière la comprenant - Google Patents

Structure de lentille de diffusion et dispositif d'émission de lumière la comprenant Download PDF

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Publication number
WO2016099195A1
WO2016099195A1 PCT/KR2015/013933 KR2015013933W WO2016099195A1 WO 2016099195 A1 WO2016099195 A1 WO 2016099195A1 KR 2015013933 W KR2015013933 W KR 2015013933W WO 2016099195 A1 WO2016099195 A1 WO 2016099195A1
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WO
WIPO (PCT)
Prior art keywords
lens surface
lens
light
light emitting
diffusion
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PCT/KR2015/013933
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English (en)
Korean (ko)
Inventor
서동필
야나가와유키히로
서용덕
Original Assignee
서동필
야나가와유키히로
서용덕
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Publication of WO2016099195A1 publication Critical patent/WO2016099195A1/fr

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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
    • F21V5/008—Combination of two or more successive refractors along an optical axis
    • 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
    • F21V5/10—Refractors for light sources comprising photoluminescent material
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G02B3/0037—Arrays characterized by the distribution or form of lenses
    • G02B3/0043—Inhomogeneous or irregular arrays, e.g. varying shape, size, height
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/58—Optical field-shaping elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B2003/0093—Simple or compound lenses characterised by the shape

Definitions

  • the present invention relates to a diffused lens structure and a light emitting device including the same, and more particularly, to a diffused lens structure and a light emitting device including the same to maximize the amount of light reaching the diffuser plate with a uniform brightness.
  • LED light emitting diode
  • the manufacturing cost of the product may be high.
  • the light emission angle or diffusion angle of the LED is about 120 degrees, some of the light emitted from the LED does not reach the diffusion plate disposed on the top of the LED, so that light loss may occur and the light emission efficiency may decrease. .
  • the present invention has been made in view of the above problems, and to provide a diffusion lens structure and a light emitting device including the same, which can reduce the light loss and increase the thickness of the device using the light source by increasing the diffusion angle of light. .
  • Another technical problem to be solved by the present invention is to provide a diffusion lens structure having a structure in which light can be uniformly dispersed in order to solve the non-uniformity of light due to hot spots and the like and a light emitting device including the same.
  • a diffusion lens structure for diffusing the light emitted from the light emitting device which is symmetrical with respect to the reference optical axis of the diffusion lens structure
  • a diffusion lens structure having a cross section comprising: a first lens surface on which light emitted from the light emitting element is incident to face the light emitting element; And a second lens surface which emits light incident through the first lens surface, wherein an angle at which incident light emitted from the light emitting element and incident on the first lens surface forms the reference optical axis is defined as ⁇ 1,
  • the first and second lenses The surface is formed to satisfy ⁇ 4 ⁇ 1 with respect to at least some of the light emitted from the light emitting element and incident on the first lens surface.
  • the light loss can be reduced by increasing the diffusion angle of the light, and the light emitting device using the light source can be thinned because the light emitting device and the diffusion plate can be disposed closer.
  • the light emitting device can be induced to generate light having a uniform brightness because it has a configuration in which light can be dispersed by being located in a region where light is concentrated, such as a hot spot.
  • FIG 1 and 2 are cross-sectional views of the diffusion lens structure according to the first embodiment of the present invention.
  • FIG 3 is a cross-sectional view of a diffusion lens structure according to a second exemplary embodiment of the present invention.
  • FIG. 4 is a cross-sectional view of a diffusion lens structure according to a third exemplary embodiment of the present invention.
  • FIG. 5 is a cross-sectional view of a diffusion lens structure according to a fourth exemplary embodiment of the present invention.
  • FIG. 6 is a cross-sectional view of a diffusion lens structure according to a fifth exemplary embodiment of the present invention.
  • FIG. 7 is a cross-sectional view of a diffusion lens structure according to a sixth embodiment of the present invention.
  • FIG. 8 is a cross-sectional view of a diffusion lens structure according to a seventh embodiment of the present invention.
  • FIG. 9 is a cross-sectional view of a diffusing lens structure according to an eighth embodiment of the present invention.
  • FIG. 10 is a cross-sectional view of a diffusion lens structure according to a ninth embodiment of the present invention.
  • FIG. 11 is a view for explaining the effect of the diffusion lens structure according to the embodiments of the present invention.
  • FIG. 12 is a table showing a simulation result using the diffusion lens structure according to the embodiments of the present invention.
  • FIGS. 1 and 2 a diffusion lens structure according to a first embodiment of the present invention will be described. 1 and 2, a cross-sectional view of a diffusion lens structure according to a first embodiment of the present invention is disclosed.
  • the diffusion lens structure 20 may be disposed to cover the periphery of the light emitting device 10, light emitted from the light emitting device 10 may be incident on the diffusion lens structure 20. Accordingly, the diffusion lens structure 20 may be used to emit light emitted from the light emitting device 10 at a constant emission angle, where the light emitting device 10 may include an LED light source, but is not limited thereto. It doesn't work.
  • the diffusion lens structure 20 includes first to fourth lens surfaces 21-24, for example, the diffusion lens structure 20 is surrounded by the first to fourth lens surfaces 21-24.
  • not all components illustrated in FIG. 1 are essential, so that the diffusion lens structure 20 having more or less components may be formed.
  • the diffusion lens structure 20 may have a cross section symmetrically with respect to the reference optical axis 30, and specifically, may have a cross section of the vertical direction symmetric with respect to the reference optical axis 30. have.
  • the direction of the reference optical axis 30 may be a vertical upward direction, that is, a vertical direction from the light emitting device 10, and the diffusion lens structure 20 may have a shape of rotational symmetry about the reference optical axis 30.
  • the present invention is not limited thereto and may have a shape that is not rotationally symmetrical.
  • the diffusion lens structure 20 may include a concave accommodating part 25 that may accommodate the light emitting device 10.
  • the concave accommodating part 25 may be a space formed by being concavely dug into the diffusion lens structure 20, and thus may have a concave shape.
  • the concave accommodating portion 25 may be surrounded by the first lens surface 21 and the open surface.
  • the concave portion may have a cross-section symmetrical with respect to the reference optical axis 30, and may have a shape of rotational symmetry around the reference optical axis 30, but is not limited thereto and may have a shape that is not rotationally symmetrical. It may be.
  • the light emitting device 10 may be accommodated in the recess 25 of the diffusion lens structure 20, the light emitted from the light emitting device 10 may have a first lens surface 21 surrounding the light emitting device 10. Can be entered. Incident light incident on the first lens surface 21 may pass through the diffusion lens structure 20 and exit to the outside of the diffusion lens structure 20 through the second lens surface 22.
  • the refractive index of the inside of the diffused lens structure 20 and the refractive index of the outside (eg, air) of the diffused lens structure 20 are different, when light is incident from the outside of the diffused lens structure 20 to the inside, When light exits from the inside of the diffusion lens structure 20 to the outside, the light is refracted according to Snell's law. Therefore, according to the diffusion lens structure 20 according to the first embodiment of the present invention, by using the characteristics according to the shape of the lens surface included in the diffusion lens structure 20, the light incident on the diffusion lens structure 20 By adjusting the advancing direction, when the incident light incident on the diffusion lens structure 20 exits from the diffusion lens structure 20, a predetermined condition may be satisfied.
  • an angle formed by the light incident from the light emitting device 10 and incident on the first lens surface 21 with the reference optical axis 30 is defined as ⁇ 1
  • the incident light is defined as first.
  • the first to third lens surfaces Reference numerals 21, 22, and 23 may be formed to satisfy ⁇ 4 ⁇ 1 with respect to at least some of the light emitted from the light emitting element 10 and incident on the first lens surface 21.
  • each lens surface will be described in detail below.
  • the first lens surface 21 may be a surface on which light emitted from the light emitting device 10 is incident to face the light emitting device 10.
  • the light emitting device 10 may be located in the recess 25 of the diffusion lens structure 20, and the recess 25 is surrounded by the first lens surface 21, so that the first The lens surface 21 may face the light emitting element 10. Therefore, the light emitted from the light emitting element 10 may be incident on the first lens surface 21.
  • the first lens surface 21 may include a first region 21a and a second region 21b that are continuously formed, and the first region 21a of the first lens surface 21.
  • An inflection point may exist at the connection portion P1 of the second region 21b of the first lens surface 21.
  • the point of inflection is not limited to a mathematical definition such as a point that changes from a convex state to a concave state or a point that changes from a concave state to a convex state, and a lens such as a point of change in curvature. If there is a change in the characteristics of the surface can be said to be an inflection point.
  • the first region 21a may be a curved surface as an upper region, and the second region 21b may be an inclined surface as a lower region, but is not limited thereto.
  • the first region 21a may be an aspherical surface, and the second region 21b may be inclined by a predetermined angle with respect to the fourth lens surface 24 perpendicular to the reference optical axis 30 as a plane.
  • ⁇ 3 may be defined as an angle formed by the extension line of the fourth lens surface 24 perpendicular to the reference optical axis 30 and the second region 21b.
  • the second region 21b of the first lens surface 21 In relation to the inclination of the second region 21b of the first lens surface 21, the second region 21b surrounds the lower end of the concave accommodating portion 25, and the lower end of the concave accommodating portion 25 is formed in a first manner.
  • the second region 21b of the first lens surface 21 is inclined in a direction in which the width is wider than the upper end of the concave receiving portion 25 surrounded by the first region 21a of the lens surface 21. There may be.
  • first region 21a is curved and the second region 21b is flat, there is a change in characteristics on the first lens surface 21, so that the first region 21a and the second region 21b are used.
  • An inflection point exists at the connecting portion P1 of.
  • a second region 21b of the first lens surface 21, which is an inclined surface, may be formed at the lower end of the concave receiving portion 25. Therefore, according to the related art, the light emitted from the light emitting element 10 and passing through the lower end of the concave accommodating portion 25 has a high probability of not reaching the diffuser plate positioned above the diffused lens structure 20.
  • the diffusion lens structure 20 according to the present exemplary embodiment is used, the light emitted from the light emitting element 10 and passing through the lower end of the concave accommodating portion 25 is the second region 21b of the first lens surface 21. Since the light is refracted toward the image while being incident on the diffusion lens structure 20 through), the probability of reaching the diffusion plate positioned on the diffusion lens structure 20 is increased.
  • light emitted from the light emitting element 10 at an angle of ⁇ 1 with the reference optical axis 30 is formed on the first lens surface 21 through the lower end of the concave accommodating part 25. It can be seen that the image is refracted toward the image while being incident to the second region 21b, and after the refracted light passes through the diffusion lens structure 20, it is emitted from the second lens surface 22 and the reference optical axis 30 and? It can be seen that the angle is refracted.
  • the second lens surface 22 may emit light incident through the first lens surface 21, and may be a curved surface as a surface surrounding the periphery of the diffusion lens structure 20, for example, an aspherical surface. However, it is not limited thereto.
  • the third lens surface 23 may be connected to the second lens surface 22, and the fourth lens surface 24 may connect the first lens surface 21 and the third lens surface 23.
  • the first lens surface 21 and the second lens surface 22 may be connected by the third lens surface 23 and the fourth lens surface 24, and the third lens surface 23 may be the second lens surface.
  • the fourth lens surface 24 may be connected to the lens surface 22, and the fourth lens surface 24 may be connected to the first lens surface 21.
  • the third lens surface 23 may be an inclined surface as a plane, but is not limited thereto. That is, the third lens surface 23 may be inclined by a predetermined angle with respect to the fourth lens surface 24 perpendicular to the reference optical axis 30 as a plane. ⁇ 2 may be defined as an angle formed by the extension line of the fourth lens surface 24 perpendicular to the reference optical axis 30 and the third lens surface 23.
  • the inclination of the third lens surface 23 may be formed to face the inclination of the second area 21b of the first lens surface 21.
  • the third lens surface 23 may be formed to reflect light in a desired direction rather than refracting the light in a desired direction.
  • the third lens surface 23 since the third lens surface 23 is positioned at the bottom of the diffusion lens structure 20, the light to be emitted to the bottom of the diffusion lens structure 20 may be reflected to the upper portion of the diffusion lens structure 20.
  • the light emitted through the lower end of the diffusion lens structure 20 has a high probability of not reaching the diffusion plate located on the diffusion lens structure 20, but according to the present embodiment,
  • incident light incident from the first lens surface 21 is reflected by the third lens surface 23 to the upper portion of the diffusion lens structure 20 and then the second lens surface 22 is closed. Since it is emitted through, the probability of reaching the diffusion plate located on the upper portion of the diffusion lens structure 20 is increased.
  • the light emitted from the light emitting element 10 forms an angle of 1 with the reference optical axis 30
  • the light is incident on the diffusion lens structure 20 through the first lens surface 21.
  • the third lens surface 23 is reflected to the upper portion of the diffusion lens structure 20, and after the refracted light passes through the diffusion lens structure 20, while exiting from the second lens surface 22 It can be seen that the light is refracted to form an angle of ⁇ 4 with the optical axis 30.
  • the third lens surface 23 may be formed to satisfy ⁇ 2> ⁇ 3.
  • ⁇ 2 ⁇ 3 since the light refracted through the second area 21b of the first lens surface 21 may not reach the third lens surface 23, the third lens surface 23 may be removed. It may not be easy to control the path of light through.
  • the fourth lens surface 24 may be a base surface, and the fourth lens surface 24 may be a horizontal plane perpendicular to the reference optical axis 30, but is not limited thereto.
  • a reflective pattern may be formed on the fourth lens surface 24 to reflect light, but is not limited thereto.
  • the diffusion angle of the diffusion lens structure 20 is increased by changing the exit angle of the light incident through the lower portion of the diffusion lens structure 20 through the first to third lens surfaces 23.
  • the diffusion angle may be 150 degrees or more, but is not limited thereto.
  • FIG. 3 a structure of a diffusion lens according to a second embodiment of the present invention will be described. However, the differences from the diffusion lens according to the first embodiment of the present invention will be mainly described. Referring to FIG. 3, a cross-sectional view of a diffusion lens structure according to a second embodiment of the present invention is disclosed.
  • a reflective pattern may be formed on the third lens surface 23 of the diffusion lens structure 30 according to the second embodiment of the present invention.
  • the reflection pattern is for reflecting light incident on the third lens surface 23.
  • the reflection pattern may include the groove 23a or the protrusion 23b, but the shape of the reflection pattern may be unlimited.
  • the surface roughness of the third lens surface 23 may be Ra 7um or more, but is not limited thereto.
  • the reflective patterns need not be formed in all regions of the third lens surface 23, and the reflective patterns may be formed only in some regions.
  • FIG. 4 a cross-sectional view of a diffusion lens structure according to a third embodiment of the present invention is disclosed.
  • a diffusion pattern may be formed on at least a portion of the second lens surface 22.
  • the diffusion pattern may be formed in an area adjacent to the third lens surface 23, but is not limited thereto.
  • the diffusion pattern may allow the light emitted through the second lens surface 22 to be efficiently reflected or refracted upward.
  • the diffusion pattern may be, for example, the groove 26 or the projection 27, but is not limited thereto, and the vertical cross section of the diffusion pattern may be, for example, triangular or elliptical, but is not limited thereto. That is, the cross section in the vertical direction of the diffusion pattern is not limited to that shown in FIG.
  • the light emitted to the second lens surface 22 is reflected or refracted by the diffusion pattern to move to the image side. According to this, it can be confirmed that ⁇ 4 ⁇ 1 is satisfied as a result, due to the diffusion pattern of the second lens surface 22.
  • the path of the light emitted from the light emitting device 10 is refracted through the diffusion lens structure 20 and the movement path is changed upward, the light incident through the lower portion of the diffusion lens structure 20 is diffused. We can see that we can reach.
  • FIG. 5 a structure of a diffusion lens according to a fourth embodiment of the present invention will be described. However, the differences from the diffusion lens according to the first embodiment of the present invention will be mainly described. Referring to FIG. 5, a cross-sectional view of a diffusion lens structure according to a fourth embodiment of the present invention is disclosed.
  • the first lens surface 21 may be a curved surface without an inflection point, and may be, for example, an aspherical surface, but is not limited thereto. .
  • FIG. 6 a structure of a diffusion lens according to a fifth embodiment of the present invention will be described. However, the differences from the diffusion lens according to the first embodiment of the present invention will be mainly described. Referring to FIG. 6, a cross-sectional view of a diffusion lens structure according to a fifth embodiment of the present invention is disclosed.
  • the second lens surface 22 and the fourth lens surface 24 may be directly connected without the third lens surface 23. Can be.
  • FIG. 7 a cross-sectional view of a diffusion lens structure according to a sixth embodiment of the present invention is disclosed.
  • the first lens surface 21 may be a curved surface without an inflection point, but may be, for example, an aspherical surface, but is not limited thereto.
  • the second lens surface 22 and the fourth lens surface 24 may be directly connected without the third lens surface 23.
  • FIG. 8 a structure of a diffusion lens according to the seventh embodiment of the present invention will be described. However, the differences from the diffusion lens according to the third embodiment of the present invention will be mainly described. Referring to FIG. 8, a cross-sectional view of a diffusion lens structure according to a seventh embodiment of the present invention is disclosed.
  • the first lens surface 21 may be a curved surface without an inflection point, but may be, for example, an aspherical surface, but is not limited thereto.
  • the second lens surface 22 and the fourth lens surface 24 may be directly connected without the third lens surface 23.
  • FIG. 10 a structure of a diffusion lens according to a ninth embodiment of the present invention will be described. However, the differences from the diffusion lens according to the first embodiment of the present invention will be mainly described. Referring to FIG. 10, a cross-sectional view of a diffusion lens structure according to a ninth embodiment of the present invention is disclosed.
  • the first lens surface 21 may further include a third region 21c. Since the third area 21c may be located above the first area 21a, the first area 21a may be located between the second area 21b and the third area 21c.
  • the third region 21c may be a planar surface, for example, an inclined surface, and the first region 21a is a curved surface, there is a change in characteristics on the first lens surface 21, so that the first region 21a may be different from the first region 21a.
  • An inflection point exists in the connection portion P2 of the third region 21c.
  • the third region 21c may be positioned at the top of the concave accommodating portion 25 and overlap with the reference optical axis 30. That is, the third region 21c may be formed at a position where incident light of which ⁇ 1 is 5 degrees or less can be incident. Since the third region 21c may be an inclined surface, the incident light may be refracted away from the reference optical axis 30.
  • the diffusion lens structure 20 according to the ninth embodiment of the present invention further includes a third region 21c, excessive glare or hot spots generated by light adjacent to the reference optical axis 30 are generated. Can be prevented.
  • the diffusion lens structure 20 has been described with reference to FIGS. 1 to 10.
  • the light emitting device may be configured using the diffusion lens structure 20 according to the exemplary embodiments of the present invention.
  • the light emitting device includes a light emitting device 10 and a diffusion for diffusing light emitted from the light emitting device 10.
  • the lens structure 20 may be included.
  • the light emitting device 10 may be located in the recess 25 of the diffusion lens structure 20, for example, to control the height of the light emitted from the light emitting device 10,
  • the upper height may be configured to be the same as or higher than the lower end of the recess 25, but is not limited thereto.
  • FIG. 11 a diagram for describing the effect of a diffusion lens structure according to embodiments of the present invention is disclosed.
  • FIG. 11A illustrates a diffusion lens structure 20 ′ according to the related art
  • FIG. 11B illustrates a diffusion lens structure 20 according to embodiments of the present invention.
  • the diffusion angle ⁇ a shown in FIG. 11A is narrower than the diffusion angle ⁇ b shown in FIG. 11B. Therefore, if the diffusion lens structure 20 'according to the prior art is used, in order to form a surface light source having a constant area due to the narrow diffusion angle ⁇ a, a larger number of light emitting elements 10 are required and the diffusion plate ( Since the distance 40) should be as far as possible, the size of the light emitting device can be increased due to the height ha of the light emitting device.
  • the number of light emitting devices 10 required to form a surface light source having a constant area can be reduced due to the wide diffusion angle ⁇ b, and the diffusion plate 40 can be disposed close to each other. Since the height hb of the light emitting device can be reduced, the size of the light emitting device can also be reduced.
  • FIG. 12 a table showing simulation results using a diffusion lens structure according to example embodiments is disclosed.
  • the diffusion angle according to the diffusion lens structure may be derived by checking between the peaks of the graph. For example, on the graph, since the peak is formed on about 10 degrees and about 170 degrees, the diffusion angle according to the diffusing lens structure according to the embodiment of the present invention can be formed larger than 150 degrees.
  • the magnitude of the luminance between both peaks on the graph can be controlled by adjusting the magnitude of ⁇ 2 or ⁇ 3 in the diffusion lens structure according to the embodiment of the present invention. Therefore, by using the diffusion lens structure according to the embodiment of the present invention, it is possible to control the intensity of the luminance for the desired portion.

Abstract

Cette invention concerne une structure de lentille de diffusion. Selon un mode de réalisation, ladite structure de lentille de diffusion conçue pour diffuser la lumière émise à partir d'un élément d'émission de lumière, qui présente une section transversale bilatéralement symétrique par rapport à son axe optique de référence, comprend : une première surface de lentille qui est orientée vers l'élément d'émission de lumière et à travers laquelle est introduite la lumière émise à partir de l'élément d'émission de lumière ; et une seconde surface de lentille à travers laquelle la lumière introduite à travers la première surface de lentille est fournie en sortie. Lorsque l'angle formé par lumière d'entrée, émise à partir de l'élément d'émission de lumière et fournie en entrée à la première surface de lentille, avec l'axe optique de référence est défini comme thêta 1, et l'angle formé par la lumière de sortie, fournie en sortie à partir de la seconde surface de lentille après l'introduction de la lumière d'entrée à la première surface de lentille, avec l'axe optique de référence est défini comme thêta 4, les première et seconde surfaces de lentille sont formées de façon à satisfaire thêta 4 < thêta 1 pour au moins une partie de la lumière qui est émise à partir de l'élément d'émission de lumière et fournie en entrée à la première surface de lentille.
PCT/KR2015/013933 2014-12-18 2015-12-18 Structure de lentille de diffusion et dispositif d'émission de lumière la comprenant WO2016099195A1 (fr)

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KR101291477B1 (ko) * 2012-09-25 2013-07-30 김종태 엘이디용 조명렌즈 및 이를 이용한 백라이트 유닛에 적용되는 조명장치

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019028396A (ja) * 2017-08-03 2019-02-21 株式会社エンプラス 光束制御部材、発光装置、面光源装置、および表示装置
CN112325198A (zh) * 2019-07-19 2021-02-05 艾科有限公司 建筑物灯
CN112325198B (zh) * 2019-07-19 2024-04-16 艾科有限公司 建筑物灯

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