US2850109A - Light-permeable sound-absorbing panel - Google Patents

Light-permeable sound-absorbing panel Download PDF

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Publication number
US2850109A
US2850109A US425855A US42585554A US2850109A US 2850109 A US2850109 A US 2850109A US 425855 A US425855 A US 425855A US 42585554 A US42585554 A US 42585554A US 2850109 A US2850109 A US 2850109A
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sound
light
permeable
layers
absorbing
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US425855A
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Benjamin Reuben Allen
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Benjamin Electric Manufacturing Co
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BENJAMIN ELECTRIC Manufacturing CO
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Priority to US425855A priority Critical patent/US2850109A/en
Priority to US454458A priority patent/US2850110A/en
Priority to GB12002/55A priority patent/GB786377A/en
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B9/00—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation
    • E04B9/04—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation comprising slabs, panels, sheets or the like
    • E04B9/045—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation comprising slabs, panels, sheets or the like being laminated
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B9/00—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation
    • E04B9/001—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation characterised by provisions for heat or sound insulation
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B9/00—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation
    • E04B9/32—Translucent ceilings, i.e. permitting both the transmission and diffusion of light

Definitions

  • This invention relates to the acoustical and optical treatment of rooms, more particularly to the provision of light-permeable and sound-absorbing panels for utilization as individual members or in connection with lighting fixtures, and it is an object of the 'invention to provide improved apparatus of this character.
  • Sound-deadening panels or baffles of the prior art have been either opaque to ⁇ light ⁇ or the exterior surface of the panel has been solid so that sound waves impinging thereon were reflected to a substantial extent. Accordingly, it is a further object of the invention to provide an improved light-permeable, sound-absorbing panel wherein the exterior surface is sound-transparent over the sound frequency range, but the interior of the panel is highly effectively sound-absorbing over the same range so that sound after having entered the panel is absorbed or deadened and never emerges.
  • a light-permeable, sound-absorbing panel comprising a pair of spaced apart perforated layers of light-permeable material and a layer of light-permeable, sound-absorbing material disposed in the space between the perforated layers.
  • Figure l is a view partially in section showing a panel according to the invention suspended from the ceiling of a room in connection with a uorescent lighting tixture;
  • Fig. 2 is a fragmentary view taken in the direction of arrows 2--2 of Fig. l;
  • Fig. 3 is a sectional view on a larger scale taken substantially along the line 3 3 of Fig. 2;
  • Fig. 4 is a fragmentary view similar to Fig. 2 of a modified form of the invention.
  • Fig. 5 is a sectional view taken substantially :along the line 5-5 of Fig. 4.
  • the invention comprises a light-permeable, sound-absorbing panel shown suspended from a ceiling 11 beneath a pair of fluorescent lamps 12 Iand 13, the suspension being by means of rods 14 or other suitable means.
  • the panel 10 comprises a pair of perforated members 15 and 16 which are spaced apart and between which there is a layer of sound :absorbing material 17.
  • the layers 15 and 16 may be in contact with the surfaces of the layer of sound-absorb- Patented Sept. l2, 1958 ICC ing material 17, but it will be understood that the layers 15 and 16 may be spaced a short distance away from the sound-absorbing material.
  • the layers 15 and 16 may be held apart in any suitable manner so as not to crush the sound-absorbing material, such for example as by spacers 18.
  • the layers 15 and 16 may be made, for example, of a clear or translucent plastic material provided with perforations 19, which perforations may, for example, be of the order of 1A inch to W16 inch in diameter and spaced on centers 3A inch to 11A inch apart.
  • perforations 19 may, for example, be of the order of 1A inch to W16 inch in diameter and spaced on centers 3A inch to 11A inch apart.
  • the size, number, and spacing of the perforations,'as well as the thickness of the layers 15 and 16 may be chosen to satisfy particular conditions so long as the dimensions are such that the layers 15 and 16 are substantially transparent to sound over the sound frequency range.
  • the material 17 may be any translucent or transparent wool, for example made ⁇ o'f spun glass or rock fibers which are highly sound absorbing over the sound frequency range. Thus, when sound impinges upon the layers 15 and 16 it passes therethrough by virtue of the perforations and then is absorbed within the wool layer 17, the thickness thereof being chosen to satisfy the particular conditions. One to two inches in thickness has been found satisfactory.
  • the panel as a whole should be light-permeable in order that use may be made of it in connection with lighting fixtures and it may be as nearly transparent as the materials desired to be used will permit. It may also, of course, be translucent whereby to produce a desirable diffused effect. Various decorative effects may be produced by using colored materials, for example, for the layers 15 and 16.
  • these layers may be corrugated as shown by layers 2l and 22 in Figs. 4 and 5.
  • the materials of layers 21 and 22 may be the same as those described in the preceding gures and the perforations 23 may be dimensioned and disposed as already described, but as shown are disposed only in the tops or outermost parts of the corrugations. Perforations may also be provided in the bottoms of the corrugations, if desired.
  • a layer of highly efficient sound-absorbing, light-permeable material 24 is disposed between the corrugated layers 21 and 22 so that contact is had for support purposes only with the bottoms or innermost parts of the corrugations.
  • the sound enters the perforations 23 and spreads out within the triangular spiace between the perforations and the surface of the wool-absorbing material 24 so that the sound impinges initially upon the sound material over a larger area thereof.
  • a greater portion of the wool-absorbing material comes into operation and a greater sound-absorbing or deadening effect is obtained.
  • a light-permeable, sound-absorbing panel comprisign a pair of spaced-apart, perforated layers of lightpermeable, material, and a layer of light-permeable, sound-absorbing material disposed in the space between said perforated layers.
  • a light-permeable, sound-absorbing panel comprising a pair of spaced-apart, perforated layers of lightpermeable material, and a layer of fibrous, lightpermeable material disposed in the space between said perforated layers.
  • a light-permeable, sound-absorbing panel comprising a pair of spaced-apart, perforated layers of lightpermeable material, spacers for holding said perforated layers in said spaced-apart relationship, and a layer of fibrous, light-permeable material disposed in the space between said perforated layers.
  • a light-permeable, sound-absorbing panel comprising a pair of spaced-apart, perforated layers of lightpermeable material, spacers for holding said perforated layers in said spaced-apart relationship, and a layer of fibrous, light-permeable material disposed in the space between said perforated layers but spaced therefrom.
  • a light-permeable, sound-absorbing panel comprising a pair of corrugated, spaced-apart, perforated layers of light-permeable material, and a layer of fibrous, lightpermeble material disposed in the space between said perforated layers.
  • a light-permeable, sound-absorbing panel comprising a pair of corrugated, spaced-apart, perforated layers of light-permeable material, and a layer of fibrous, lightpermeable material disposed in the space between said perforated layers but being in contact only with the innermost parts of the Acorrugations thereof.
  • a light-permeable, sound-absorbing panel comprising a pair of corrugated, spaced-apart layers of lightpermeable material, each of said layers being perforated along the outermost parts of the corrugations thereof, and a layer of fibrous, light-permeable material disposed in the space between said perforated layers but being in contact only with the innermost parts of the corrugations three'of.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Building Environments (AREA)

Description

Y Sept. 2,'1958 R. A. BENJAMIN LIGHT-.'PERMEABLE SOUND-ABSORBING PANEL Filed April 27, 1954 S f L V United States Patent O LIGHT-PERMEABLE SOUND-ABSRBING PANEL Reuben Allen Benjamin, Glencoe, lll., assignor to Ben- ]amln Electric Manufacturing Company, Glencoe, Ill., a corporation of Illinois Application April 27, 1954, Serial No. 425,855
7 Claims. (Cl. 181-33) This invention relates to the acoustical and optical treatment of rooms, more particularly to the provision of light-permeable and sound-absorbing panels for utilization as individual members or in connection with lighting fixtures, and it is an object of the 'invention to provide improved apparatus of this character.
It is a further object of the invention to provide a panel of the character described which is simple in construction, ecient in operation, and pleasing in appearance. l
In many rooms, whether oces, studios or factories, it is desirable to have' sound-deadening means and, conveniently, these may be provided in connection with lighting fixtures, particularly those of the fluorescent lamp type, in order not lonly to absorb sound from the light fixture itself, but from the surroundings.
Sound-deadening panels or baffles of the prior art have been either opaque to `light `or the exterior surface of the panel has been solid so that sound waves impinging thereon were reflected to a substantial extent. Accordingly, it is a further object of the invention to provide an improved light-permeable, sound-absorbing panel wherein the exterior surface is sound-transparent over the sound frequency range, but the interior of the panel is highly effectively sound-absorbing over the same range so that sound after having entered the panel is absorbed or deadened and never emerges. In carrying out the invention in one form a light-permeable, sound-absorbing panel is provided comprising a pair of spaced apart perforated layers of light-permeable material and a layer of light-permeable, sound-absorbing material disposed in the space between the perforated layers.
For a more complete understanding of the invention reference should be had to the accompanying drawings, in which Figure l is a view partially in section showing a panel according to the invention suspended from the ceiling of a room in connection with a uorescent lighting tixture;
Fig. 2 is a fragmentary view taken in the direction of arrows 2--2 of Fig. l;
Fig. 3 is a sectional view on a larger scale taken substantially along the line 3 3 of Fig. 2;
Fig. 4 is a fragmentary view similar to Fig. 2 of a modified form of the invention; and
Fig. 5 is a sectional view taken substantially :along the line 5-5 of Fig. 4.
Referring to the drawings, the invention comprises a light-permeable, sound-absorbing panel shown suspended from a ceiling 11 beneath a pair of fluorescent lamps 12 Iand 13, the suspension being by means of rods 14 or other suitable means.
The panel 10 comprises a pair of perforated members 15 and 16 which are spaced apart and between which there is a layer of sound :absorbing material 17. As shown in Figs. 1 and 2, the layers 15 and 16 may be in contact with the surfaces of the layer of sound-absorb- Patented Sept. l2, 1958 ICC ing material 17, but it will be understood that the layers 15 and 16 may be spaced a short distance away from the sound-absorbing material. The layers 15 and 16 may be held apart in any suitable manner so as not to crush the sound-absorbing material, such for example as by spacers 18.
The layers 15 and 16 may be made, for example, of a clear or translucent plastic material provided with perforations 19, which perforations may, for example, be of the order of 1A inch to W16 inch in diameter and spaced on centers 3A inch to 11A inch apart. The size, number, and spacing of the perforations,'as well as the thickness of the layers 15 and 16, may be chosen to satisfy particular conditions so long as the dimensions are such that the layers 15 and 16 are substantially transparent to sound over the sound frequency range.
The material 17 may be any translucent or transparent wool, for example made `o'f spun glass or rock fibers which are highly sound absorbing over the sound frequency range. Thus, when sound impinges upon the layers 15 and 16 it passes therethrough by virtue of the perforations and then is absorbed within the wool layer 17, the thickness thereof being chosen to satisfy the particular conditions. One to two inches in thickness has been found satisfactory.
The panel as a whole should be light-permeable in order that use may be made of it in connection with lighting fixtures and it may be as nearly transparent as the materials desired to be used will permit. It may also, of course, be translucent whereby to produce a desirable diffused effect. Various decorative effects may be produced by using colored materials, for example, for the layers 15 and 16.
To obtain a slight spacing of a substantial portion of the exterior layers from the sound-absorbing material, these layers may be corrugated as shown by layers 2l and 22 in Figs. 4 and 5. The materials of layers 21 and 22 may be the same as those described in the preceding gures and the perforations 23 may be dimensioned and disposed as already described, but as shown are disposed only in the tops or outermost parts of the corrugations. Perforations may also be provided in the bottoms of the corrugations, if desired. A layer of highly efficient sound-absorbing, light-permeable material 24 is disposed between the corrugated layers 21 and 22 so that contact is had for support purposes only with the bottoms or innermost parts of the corrugations. In a panel constructed in this fashion, the sound enters the perforations 23 and spreads out within the triangular spiace between the perforations and the surface of the wool-absorbing material 24 so that the sound impinges initially upon the sound material over a larger area thereof. A greater portion of the wool-absorbing materialcomes into operation and a greater sound-absorbing or deadening effect is obtained.
While particular embodiments of the invention have been shown, it will be understood, of course, that the invention is not limited thereto since many modications may be made, and it is, therefore, contemplated by the appended claims to cover any such modifications as fall within the true spirit and scope of the invention.
The invention having thus been described, what is claimed and desired to be secured by Letters Patent is:
l. A light-permeable, sound-absorbing panel comprisign a pair of spaced-apart, perforated layers of lightpermeable, material, and a layer of light-permeable, sound-absorbing material disposed in the space between said perforated layers.
2. A light-permeable, sound-absorbing panel comprising a pair of spaced-apart, perforated layers of lightpermeable material, and a layer of fibrous, lightpermeable material disposed in the space between said perforated layers.
3. A light-permeable, sound-absorbing panel comprising a pair of spaced-apart, perforated layers of lightpermeable material, spacers for holding said perforated layers in said spaced-apart relationship, and a layer of fibrous, light-permeable material disposed in the space between said perforated layers.
4. A light-permeable, sound-absorbing panel comprising a pair of spaced-apart, perforated layers of lightpermeable material, spacers for holding said perforated layers in said spaced-apart relationship, and a layer of fibrous, light-permeable material disposed in the space between said perforated layers but spaced therefrom.
5. A light-permeable, sound-absorbing panel comprising a pair of corrugated, spaced-apart, perforated layers of light-permeable material, and a layer of fibrous, lightpermeble material disposed in the space between said perforated layers.
6. A light-permeable, sound-absorbing panel comprising a pair of corrugated, spaced-apart, perforated layers of light-permeable material, and a layer of fibrous, lightpermeable material disposed in the space between said perforated layers but being in contact only with the innermost parts of the Acorrugations thereof.
7. A light-permeable, sound-absorbing panel comprising a pair of corrugated, spaced-apart layers of lightpermeable material, each of said layers being perforated along the outermost parts of the corrugations thereof, and a layer of fibrous, light-permeable material disposed in the space between said perforated layers but being in contact only with the innermost parts of the corrugations three'of.
References Cited in the file of this patent UNITED STATES PATENTS 2,011,252 Modigliani Aug. 13, 1935 2,160,638 Bedell et al, May 30, 1939 2,161,708 Heerwagen June 6, 1939 2,218,992 Monroe Oct. 22, 1940 2,590,204 Phillips Mar. 25, 1952 2,710,335 Wong June 7, 1955 2,715,449 Lemmerman et alv Aug. 16, 1955 2,759,093 Ferar et al. Aug. 14, 1956
US425855A 1954-04-27 1954-04-27 Light-permeable sound-absorbing panel Expired - Lifetime US2850109A (en)

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US425855A US2850109A (en) 1954-04-27 1954-04-27 Light-permeable sound-absorbing panel
US454458A US2850110A (en) 1954-04-27 1954-09-07 Translucent acoustical ceiling panels
GB12002/55A GB786377A (en) 1954-04-27 1955-04-26 Improvements in or relating to panels

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Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2966954A (en) * 1957-07-11 1961-01-03 Celotex Corp Acoustical correction element
US2978571A (en) * 1956-07-31 1961-04-04 Maurice C Rosenblatt Luminous acoustical ceiling
US2996417A (en) * 1958-07-07 1961-08-15 Wilson Bertram Arnold Luminous ceiling panel
US3087568A (en) * 1959-03-23 1963-04-30 Bolt Beranek & Newman Vibration-damped structure
US3092203A (en) * 1960-06-30 1963-06-04 Owens Corning Fiberglass Corp Sound absorbing fibrous board with plastic film covering
US3149693A (en) * 1960-08-01 1964-09-22 Owens Corning Fiberglass Corp Acoustical surfaces
US3253675A (en) * 1955-01-24 1966-05-31 Bolt Beranek & Newman Light-transmitting acoustic absorber and method
US4261433A (en) * 1979-02-12 1981-04-14 Herman Miller, Inc. Acoustical-reflective ceiling construction
US5532440A (en) * 1993-12-10 1996-07-02 Nitto Boseki Co., Ltd. Light transmissive sound absorbing member
DE19743785A1 (en) * 1997-10-02 1999-04-29 Ralf Dr Kinkeldey Ceiling grid erection giving divided surface areas
US5912442A (en) * 1997-07-02 1999-06-15 Trw Inc. Structure having low acoustically-induced vibration response
DE19946312A1 (en) * 1999-09-28 2001-04-19 Brakel Aero Gmbh Daylight panel comprises an outer solid plate and an inner perforated plate which are made of a transparent plastic material, and bound a space which is filled with a sound absorbent transparent material
WO2001092782A1 (en) * 2000-05-25 2001-12-06 Otis Elevator Company Sound absorbing light fixture
US6351914B1 (en) * 1998-01-30 2002-03-05 Werner Sobek Ingenieure Gmbh Light-transmitting building construction element
US20030046889A1 (en) * 2001-09-11 2003-03-13 Lynch Diane Irene Moire ceiling panels
US20080259616A1 (en) * 2005-07-12 2008-10-23 Morgan Herbert J Acoustic systems for lighting in suspended ceilings
EP2694750A1 (en) * 2011-04-04 2014-02-12 USG Interiors, LLC Corrugated acoustical panel and production method
CN107407089A (en) * 2015-03-18 2017-11-28 阿姆斯特郎世界工业公司 Facing ceiling system
AT516088A3 (en) * 2014-07-17 2019-01-15 Anton Schnurrer lighting device
US10672376B1 (en) 2019-04-01 2020-06-02 Eaton Intelligent Power Limited Acoustic luminaires

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2314396B1 (en) * 1973-03-22 1974-06-20 Vasiljevic Costa Silard Dipl I Device for sound absorption using resonators
DE2930123A1 (en) * 1979-07-25 1981-02-12 Wilhelmi Holzwerk SOUND-absorbing building board
GB2128651A (en) * 1982-10-15 1984-05-02 Louis Hardy William Vasbenter Transluscent or transparent material

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2011252A (en) * 1932-09-30 1935-08-13 Balzaretti Modigliani Spa Glass article
US2160638A (en) * 1937-08-19 1939-05-30 Bell Telephone Labor Inc Sound-absorbing unit
US2161708A (en) * 1937-07-29 1939-06-06 Paul M Heerwagen Acoustic surfacing for walls, ceilings, partitions, or the like
US2218992A (en) * 1937-10-28 1940-10-22 Celotex Corp Ceiling construction
US2590204A (en) * 1950-06-30 1952-03-25 Hardy K Phillips Acoustical venetian blind
US2710335A (en) * 1952-12-30 1955-06-07 Cepco Inc Light diffusing and sound absorbing unit
US2715449A (en) * 1949-12-12 1955-08-16 Carl W Lemmerman Combined lighting and sound absorbing fixture
US2759093A (en) * 1953-12-28 1956-08-14 Sylvania Electric Prod Lighting and sound absorbing fixture

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2011252A (en) * 1932-09-30 1935-08-13 Balzaretti Modigliani Spa Glass article
US2161708A (en) * 1937-07-29 1939-06-06 Paul M Heerwagen Acoustic surfacing for walls, ceilings, partitions, or the like
US2160638A (en) * 1937-08-19 1939-05-30 Bell Telephone Labor Inc Sound-absorbing unit
US2218992A (en) * 1937-10-28 1940-10-22 Celotex Corp Ceiling construction
US2715449A (en) * 1949-12-12 1955-08-16 Carl W Lemmerman Combined lighting and sound absorbing fixture
US2590204A (en) * 1950-06-30 1952-03-25 Hardy K Phillips Acoustical venetian blind
US2710335A (en) * 1952-12-30 1955-06-07 Cepco Inc Light diffusing and sound absorbing unit
US2759093A (en) * 1953-12-28 1956-08-14 Sylvania Electric Prod Lighting and sound absorbing fixture

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3253675A (en) * 1955-01-24 1966-05-31 Bolt Beranek & Newman Light-transmitting acoustic absorber and method
US2978571A (en) * 1956-07-31 1961-04-04 Maurice C Rosenblatt Luminous acoustical ceiling
US2966954A (en) * 1957-07-11 1961-01-03 Celotex Corp Acoustical correction element
US2996417A (en) * 1958-07-07 1961-08-15 Wilson Bertram Arnold Luminous ceiling panel
US3087568A (en) * 1959-03-23 1963-04-30 Bolt Beranek & Newman Vibration-damped structure
US3092203A (en) * 1960-06-30 1963-06-04 Owens Corning Fiberglass Corp Sound absorbing fibrous board with plastic film covering
US3149693A (en) * 1960-08-01 1964-09-22 Owens Corning Fiberglass Corp Acoustical surfaces
US4261433A (en) * 1979-02-12 1981-04-14 Herman Miller, Inc. Acoustical-reflective ceiling construction
US5532440A (en) * 1993-12-10 1996-07-02 Nitto Boseki Co., Ltd. Light transmissive sound absorbing member
US5912442A (en) * 1997-07-02 1999-06-15 Trw Inc. Structure having low acoustically-induced vibration response
DE19743785C2 (en) * 1997-10-02 2001-11-08 Ralf Kinkeldey Suspended ceiling
DE19743785A1 (en) * 1997-10-02 1999-04-29 Ralf Dr Kinkeldey Ceiling grid erection giving divided surface areas
US6351914B1 (en) * 1998-01-30 2002-03-05 Werner Sobek Ingenieure Gmbh Light-transmitting building construction element
DE19946312A1 (en) * 1999-09-28 2001-04-19 Brakel Aero Gmbh Daylight panel comprises an outer solid plate and an inner perforated plate which are made of a transparent plastic material, and bound a space which is filled with a sound absorbent transparent material
WO2001092782A1 (en) * 2000-05-25 2001-12-06 Otis Elevator Company Sound absorbing light fixture
US7658046B2 (en) * 2001-09-11 2010-02-09 Usg Interiors, Inc. Moiré ceiling panels
US20030046889A1 (en) * 2001-09-11 2003-03-13 Lynch Diane Irene Moire ceiling panels
US10184248B2 (en) 2005-07-12 2019-01-22 Spirit Acoustics Inc. Acoustic systems for lighting in suspended ceilings
US7971680B2 (en) * 2005-07-12 2011-07-05 Spirit Acoustics Inc. Acoustic systems for lighting in suspended ceilings
US9745744B2 (en) 2005-07-12 2017-08-29 Spirit Acoustics Inc. Acoustic systems for lighting in suspended ceilings
US20080259616A1 (en) * 2005-07-12 2008-10-23 Morgan Herbert J Acoustic systems for lighting in suspended ceilings
US11142907B2 (en) 2005-07-12 2021-10-12 Spirit Acoustics Inc. Acoustic systems for lighting in suspended ceilings
EP2694750A1 (en) * 2011-04-04 2014-02-12 USG Interiors, LLC Corrugated acoustical panel and production method
AT516088A3 (en) * 2014-07-17 2019-01-15 Anton Schnurrer lighting device
CN107407089A (en) * 2015-03-18 2017-11-28 阿姆斯特郎世界工业公司 Facing ceiling system
US10672376B1 (en) 2019-04-01 2020-06-02 Eaton Intelligent Power Limited Acoustic luminaires
US10755685B1 (en) * 2019-04-01 2020-08-25 Signify Holding B.V. Acoustic luminaires

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