Abstract: Provided is an interlayer film for laminated glass capable of enhancing the heat shielding property, suppressing multiple images, and satisfactorily displaying an image. An interlayer film for laminated glass according to the present invention is an interlayer film for laminated glass for use in a laminated glass serving as a head-up display, the interlayer film has a region for display corresponding to a display region of the head-up display, the interlayer film includes an infrared reflective layer, a first resin layer containing a thermoplastic resin, and a second resin layer containing a thermoplastic resin, the first resin layer is arranged on a first surface side of the infrared reflective layer, the second resin layer is arranged on a second surface side opposite to the first surface of the infrared reflective layer, at least one of the first resin layer and the second resin layer has a wedge angle of 0.

Abstract: The present invention is directed to flame-retardant building panels comprising a body having a first major surface opposite a second major surface; an inorganic coating atop the first major surface, the inorganic coating being optically transparent and flame retardant and comprising a blend of a borate compound and a phosphate compound, and wherein the inorganic flame retardant coating is substantially transparent such that the first major surface of the body is visible through the inorganic coating.

Abstract: A stretched-web structure for producing a false ceiling or a dropped ceiling box in a room, including two flexible webs arranged parallel to one another and fastened stretched between at least one wall, wherein one of the webs is made of polyvinyl chloride and the other web is made of fabric.

Abstract: An acoustical and illumination baffle for suspension in a ceiling area comprising a housing and a light strip in the housing, the housing being an elongated sheet metal hollow body with opposed sidewalls and a bottom wall, at least a portion of the sidewalls and/or the bottom wall having perforations, a visible light emitting strip within the housing and extending along a major part of the length of the housing and extending a major part of a length of the housing, the light emitting strip being arranged to radiate visible light through an open area in a wall of the housing thereby illuminate an area below the housing, the perforations serving to reduce noise existing in the area below the baffle and to allow cooling air circulation through the housing.

Abstract: An acoustically absorbent assembly intended to constitute, inside premises, a partition element able to be fixed to at least one partition for producing false partitions, comprising: two fabrics parallel to each other and assembled on an attachment means at a periphery of the two fabrics, the fabrics defining respectively an inner fabric and an outer fabric when the assembly is fixed to the partition, one of the fabrics being free from perforations, wherein the outer fabric is disposed at a given distance from the inner fabric and the outer fabric comprises microperforations configured as an acoustic fabric.

Abstract: This assembly solves the problem of hanging heavy implements from a drop ceiling by bypassing its load-bearing capacity. Separate from the drop ceiling track and hangar wires, the user installs an anchor into the structural ceiling, places a rod in the anchor, and attaches to the other end of the rod a track piece formed to fit around the ceiling track. The track piece has two prongs, each with a hole for a screw on the bottom, with the ceiling track passing through the space between the prongs. The user screws a plate or a track for ceiling lights to the bottom of each prong, then attaches the desired hanging implement to the plate or lighting track.

Abstract: A suspended ceiling system for a building structure includes a plurality of parallel struts for supporting a plurality of parallel vanes suspended from the struts in perpendicular relationship thereto. The vanes can be suspended in downwardly spaced relationship to the struts or in contiguous relationship therewith and occur in different forms including illuminated vanes, adjustable vanes and the like.

Abstract: A modular structural member (100) comprising: at least two connection portions (102), and a structural portion (101), the connection portions arranged to provide electrical and mechanical connection to other structural members, and wherein, electronic componentry (125) is provided on the structural portion, and/or the connection portions are arranged to receive a fastener (240; 260), to connect multiple connection portions together, which is provided with electronic componentry, and further wherein, a plurality of the structural members arranged to be connected together to form a structure.

Abstract: There is provided a light-emitting acoustic panel that may be mounted in a ceiling. The light-emitting acoustic panel comprises a sound-absorbing layer and a light-transmissive layer arranged in parallel such that a space is formed in-between. In the space a light source and a reflector are arranged such that light emitted by the light source is redirected by the reflector and emitted towards a reflective side of the sound-absorbing layer. There is further a duct arranged through the light-emitting acoustic panel. In the duct, devices providing functionalities such as sensing, sound, lighting may be arranged. The outer surface of the duct, facing the space between the sound-absorbing layer and the light-transmissive layer comprises a specularly reflective surface.

Abstract: A work-station utilizes sound absorbing, translucent enclosure panels that allows light from outside of the work-station to enter. The translucent enclosure panels have an outside panel, and intermediate panel and an inside panel of a translucent plastic sheet material that form cells for dampening sound transmission through the enclosure panels. The inside panel has a plurality of apertures to allow sound to enter and be dissipated within the internal cells. A sound masking device is configured within the work-station and projects a dampening sound into the work-station, such as along the opening to work-station to produce a masking sound curtain for sound entering the work-station.

Abstract: The invention relates to a set (1) of panels forming a lighting system, the set comprising a light-emitting panel (2) and a light-reflecting panel (3), each panel having two opposing first sides (4), two opposing second sides (5) and two opposing main surfaces (6). Each panel is suspended from a ceiling (7) with a first side (4) thereof facing the ceiling. The light-emitting panel (2) comprises a light source (11) arranged on a second side (5) thereof. The second side (5) of the light-emitting panel (2) faces a main surface (6) of the light-reflecting panel (3) such that the light source (11) is arranged to illuminate the main surface (6) of the light-reflecting panel (3). The invention also relates to a lighting system including such set of panels and an acoustic panel as such.

Abstract: A work-station utilizes sound absorbing, translucent enclosure panels that allows light from outside of the work-station to enter. The translucent enclosure panels have an outside panel, and intermediate panel and an inside panel of a translucent plastic sheet material that form cells for dampening sound transmission through the enclosure panels. The inside panel has a plurality of apertures to allow sound to enter and be dissipated within the internal cells. A sound masking device is configured within the work-station and projects a dampening sound into the work-station, such as along the opening to work-station to produce a masking sound curtain for sound entering the work-station.

Abstract: The present invention relates to alight-emitting panel (1) comprising: a first panel sheet (11), the first panel sheet being optically transparent; a second panel sheet (12); and a cellular support panel (10) sandwiched between the first panel sheet and the second panel sheet. The cellular support panel comprises optically transparent cell walls (13) defining a plurality of tubular channels (14) extending from the first panel sheet towards the second panel sheet. The light-emitting panel (1) further comprises a two-dimensional light-source array (15;16;24;27) comprising a plurality of light-sources (18a-b;19a-b) each being arranged to emit light into at least one of the tubular channels of the cellular support panel. Various embodiments of the present invention provide a cost-efficient light-emitting panel with advantageous light-emission and mechanical properties.

Abstract: A sound absorbing luminaire providing lighting for an interior space environment and managing the acoustics within the environment. The luminaire includes a frame holding an acoustic film and a lighting element, forming a resonant cavity between them. The acoustic film is used for absorbing sound within the resonant cavity, and the lighting element provides light from a light source, such as LEDs, through the acoustic film. An optical film can be mounted in the frame between the acoustic film and the lighting element for providing a desired distribution of light.

Abstract: An optical acoustic panel 100 for absorbing sound and providing a daylight appearance and a luminaire are provided. The optical acoustic panel 100 comprises a first side 114, a second side 104, a micro perforated foil 110 and a spacing structure 108. The first side 114 receives sound. The second side 104 is opposite the first side 114 and receives light. The micro perforated foil 110 comprises sub-millimeter holes 112, is light transmitting and is arranged at the first side 114. The sub-millimeter holes 112 are entrance holes of a cavity. The spacing structure 108 spaces the first side 114 at a predefined distance from the second side 104. The spacing structure 108 comprises a plurality of light transmitting cells 106. The light transmitting cells 106 comprise a light transmitting channel 118, a light exit window 122, a light input window 120 and a wall 116. The light transmitting channel 118 collimates a part of the light received at the second side 104 of the optical acoustic panel 100.

Abstract: An optical acoustic panel 100 for absorbing sound and providing a daylight appearance and a luminaire are provided. The optical acoustic panel 100 comprises a first side 114, a second side 104, a micro perforated foil 110 and a spacing structure 108. The first side 114 receives sound. The second side 104 is opposite the first side 114 and receives light. The micro perforated foil 110 comprises sub-millimeter holes 112, is light transmitting and is arranged at the first side 114. The sub-millimeter holes 112 are entrance holes of a cavity. The spacing structure 108 spaces the first side 114 at a predefined distance from the second side 104. The spacing structure 108 comprises a plurality of light transmitting cells 106. The light transmitting cells 106 comprise a light transmitting channel 118, a light exit window 122, a light input window 120 and a wall 116. The light transmitting channel 118 collimates a part of the light received at the second side 104 of the optical acoustic panel 100.

Abstract: It is an object of the present invention to provide an interlayer film for a laminated glass excellent in a sound-insulating property, which is preferably usable for a head up display and the like wherein a driver can look at the front view and an instrument display simultaneously without requiring to look down, and to provide a laminated glass. The present invention is directed to interlayer film for a laminated glass, which comprises at least a pair of protection layers and a sound-insulating layer sandwiched between the pair of the protection layers, and which has a wedge shape as a cross-sectional shape, a wedge angle ? of 0.1 to 0.7 mrad, the maximum thickness of 2000 ?m or thinner, and the minimum thickness of 400 ?m or thicker, the minimum thickness of the sound-insulating layer being 20 ?m or thicker.

Abstract: Transparent panel of acrylic glass (PMMA) having internal reinforcement elements for securing fragments of the acrylic glass formed upon an impact with a foreign body. The reinforcement elements are embedded interspersed within the panel and spaced apart in parallel longitudinally. The reinforcement elements include rigid cables and elastic cables. The rigid cables are formed of a metal having an ultimate tensile strength of at least 500 MPa. The elastic cables are formed of a metal having a percentage elongation (engineering strain at fracture) of at least 30%, preferably between 40% and 80%. The rigid cables and elastic cables may be separate and spaced apart from one another, or intertwined with each other. The panels may be used to form an acoustic barrier.

Abstract: It is an object of the present invention to provide an interlayer film for a laminated glass excellent in a sound-insulating property, which is preferably usable for a head up display and the like wherein a driver can look at the front view and an instrument display simultaneously without requiring to look down, and to provide a laminated glass. The present invention is directed to interlayer film for a laminated glass, which comprises at least a pair of protection layers and a sound-insulating layer sandwiched between the pair of the protection layers, and which has ah wedge shape as a cross-sectional shape, a wedge angle ? of 0.1 to 0.7 mrad, the maximum thickness of 2000 ?m or thinner, and the minimum thickness of 400 ?m or thicker, the minimum thickness of the sound-insulating layer being 20 ?m or thicker.

Abstract: It is an object of the present invention to provide an interlayer film for a laminated glass excellent in a sound-insulating property, which is preferably usable for a head up display and the like wherein a driver can look at the front view and an instrument display simultaneously without requiring to look down, and to provide a laminated glass. The present invention is directed to interlayer film for a laminated glass, which comprises at least a pair of protection layers and a sound-insulating layer sandwiched between the pair of the protection layers, and which has a wedge shape as a cross-sectional shape, a wedge angle ? of 0.1 to 0.7 mrad, the maximum thickness of 2000 ?m or thinner, and the minimum thickness of 400 ?m or thicker, the minimum thickness of the sound-insulating layer being 20 ?m or thicker.

Abstract: A glazing unit with an improved vibroacoustic damping property including at least one sheet of glass and at least one vibroacoustic damping strip that is attached to at least one of the faces of the glass sheet and that includes at least one component made of damping material having a loss factor greater than 0.2. The strip is not joined to any other device on the opposite side from the glass sheet and the component made of damping material has a Young's modulus greater than 800 MPa, at 20° C., for a particular frequency corresponding to the critical frequency of the glazing unit to within plus or minus 30%.

Abstract: It is an object of the present invention to provide an interlayer film for a laminated glass excellent in a sound-insulating property, which is preferably usable for a head up display and the like wherein a driver can look at the front view and an instrument display simultaneously without requiring to look down, and to provide a laminated glass. The present invention is directed to interlayer film for a laminated glass, which comprises at least a pair of protection layers and a sound-insulating layer sandwiched between the pair of the protection layers, and which has a wedge shape as a cross-sectional shape, a wedge angle ? of 0.1 to 0.7 mrad, the maximum thickness of 2000 ?m or thinner, and the minimum thickness of 400 ?m or thicker, the minimum thickness of the sound-insulating layer being 20 ?m or thicker.

Abstract: Laminated glazing (2) comprising a viscoelastic plastic insert (3) comprising at least two damping films (30, 31) each having a loss factor tan ? greater than 0.6 and a shear modulus G? less than 2×107 Pa over two temperature ranges tA et tB respectively, characterized in that the film which has, at a frequency of 200 Hz, the highest loss factor tan ? over a given temperature range included within the temperature range tA or tB, has an equivalent shear modulus G?eq less than the equivalent shear modulus or moduli of the other film or films, with G eq ? = G ? ? e tot e where G? is the shear modulus of the material constituting the film, e is the thickness of the film and etot the total thickness of the insert.

Abstract: Soundproofing, restraining systems including at least one transparent acrylic glass panel that contains at least one embedded metal cable. A layer of plastic is provided, at least partially, between the surface of the metal cable and the transparent acrylic glass matrix. The restraining systems can be used in particular as noise barriers.

Abstract: It is an object of the present invention to provide an interlayer film for a laminated glass excellent in a sound-insulating property, which is preferably usable for a head up display and the like wherein a driver can look at the front view and an instrument display simultaneously without requiring to look down, and to provide a laminated glass. The present invention is directed to interlayer film for a laminated glass, which comprises at least a pair of protection layers and a sound-insulating layer sandwiched between the pair of the protection layers, and which has a wedge shape as a cross-sectional shape, a wedge angle ? of 0.1 to 0.7 mrad, the maximum thickness of 2000 ?m or thinner, and the minimum thickness of 400 ?m or thicker, the minimum thickness of the sound-insulating layer being 20 ?m or thicker.

Abstract: A noise barrier system composed of a base and a transparent superstructure. A support holds at least two adjacent transparent noise barrier elements and includes a point-fastening of the transparent noise barrier element. A position of upper holding points of the transparent superstructure is arranged at a height of from 70 to 90% of a total height of the transparent noise barrier element and at a distance of from 3 to 50 times a thickness of the transparent noise barrier element from a vertical edge. An upper side of the transparent noise barrier element has a flexure, an angle of the flexure being from 30° to 90° from vertical, and a width of an angled region being from 5 cm to 50 cm, and an entire length of a lower side of the sheet is secured within a groove-shaped depression.

Abstract: A panel assembly for a traffic noise barrier wall of the type including opposing slots formed in pairs of vertically-mounted posts is described. The panel assembly includes a sheet, which may be transparent, and a frame disposed along at least a portion of the perimeter of the sheet. Side portions of the frame capture at least a portion of the side edges of the sheet and are received within the opposing slots in drop-down fashion.

Abstract: An acoustic insulating glazing unit including at least two substrate sheets, joined together around their periphery using a device that forms a sealed joint and a spacer frame, which device, with the two substrate sheets, defines a flat cavity filled with a gas. At least one microcavity is formed over at least part of the periphery of the cavity, constituting a zone of thermoviscous losses from the cavity along at least one of internal walls of the two substrate sheets by which the cavity is bounded. Dimensions of the at least one microcavity are chosen to promote propagation of some of the acoustic waves from the cavity into the microcavity, generating thermoviscous losses and thus reducing acoustic energy of the cavity. A mechanism is provided to contain the acoustic waves escaping from the microcavity.

Abstract: An active sound muffler for reducing a sound to be reduced as emitted from a sound source located at one of the opposite sides of a sound insulating wall and diffracted and transmitted to the other side, the muffler comprises a control loudspeaker arranged at the front end or the other side of the sound insulating wall and adapted to output a control sound with a predetermined amplitude and a predetermined phase, a control microphone arranged above the sound insulating wall and adapted to gauge the sound pressure or the acoustic intensity of the sound to be reduced and that of the control sound and a control circuit for controlling the output of the control loudspeaker so as to minimize the sound pressure or the acoustic intensity, whichever appropriate, based on the outcome of gauging of the control microphone, and the control loudspeaker showing a line sound source characteristic.

Abstract: An ultra light, noise reducing composite (1) comprises an acoustically transparent, light weight film (6) between an underlay layer (5) and an air flow resistance layer (4). This composite allows to easily tune the acoustic properties by balancing the absorption and sound transmission behaviour of the composite (1). This air flow resistance layer (4) has an air flow resistance of between 500 Ns/m3 and 10,000 Ns/m3 and an area mass between 200 g/m2 and 3,000 g/m2. The underlay layer (5) has a stiffness value in the range between 100 Pa and 100,000 Pa. The light weight film (6) may consist of a synthetic foil and preferably has a thickness of 0.01 mm.

Abstract: A method of acoustically attenuating noises of structure-borne origin in an article of manufacture by installing a laminated window having a glass sheet and an intermediate film, where the film has a loss factor tan ? greater than 0.6 and a shear modulus G? smaller than 2×107 N/m2 in a temperature range between 10 and 60° C. and in a frequency range between 50 and 10,000 Hz.

Abstract: An object of the present invention is to provide a transparent noise-barrier wall which is slow to foul, easy to clean even when fouled, and capable of maintaining these effects over a long period of time. The transparent noise-barrier wall has brookite titanium dioxide substantially existing on the surface. The titanium dioxide particles preferably contain about 20% by mass or more of brookite titanium dioxide.

Abstract: The invention relates to an acoustic insulating glazing unit. This glazing unit comprises two glass sheets (12, 14) joined together around their periphery by means of an assembly (16) forming a seal (163) and an insert frame (161) which defines, with the two glass sheets, a flat cavity filled with a gas, and a waveguide fastened between the glass sheets, internal to the insert frame. The waveguide consists of at least one straight tubular section (20, 22, 24, 26) placed on the periphery of the gas-filled cavity along one side of the glazing unit, this section being provided with a transverse partition (28) which closes the latter in its length direction, the said partition being placed at a length position along the section which depends on the acoustic mode of the cavity that it is desired to disorganize, this partition defining, on either side of it, two chambers (30, 31) which communicate with the cavity through the ends of the sections.

Abstract: A light-transmitting building component, as wall roof or ceiling component etc. is formed with a technical membrane, in the form of a textile tissue on the outward-facing side and, furthermore, by a sound-insulation layer arranged at a distance to the outer layer of the technical membrane, and by and infrared-impeding, light-transmitting layer on the inward-facing side. In this manner, a building component is created which features low surface weight and still meets stringent requirements not only in terms of resistance to climatic influences but also with regard to heat and sound insulation.

Abstract: A window pane fixed to an automobile via a peripheral joint forms at least a part of a wall defining a cabin of the vehicle. The window pane, at the peripheral joint, is constructed so as to eliminate at least one mode of acoustic radiance from the pane to a cavity defined by the cabin when the pane is excited by an acoustic field.

Abstract: Disclosed a thermal- and sound-insulating container having a chamber, which is defined by multilayer wall structure including vacuum layers therein. The chamber is made as small as possible the surface area thereof to achieve the high insulating effectiveness. The thermal- and sound-insulating container is comprised of the multilayer wall structure with vacuum layers therein, which constitutes the chamber defined in a hollow cylinder partially having a flat secant face, the hollow cylinder having a cross section of a circle or an ellipse that closely resembles the circle. The multilayer wall structure is composed of a pair of confronting frames arranged spaced away from each other, surface panels attached to the frames to define an empty space between the confronting frames, and sealing members arranged between the frames and the peripheries of the surface panels so as to keep the space at vacuum.

Abstract: The invention relates to a soundproofing window in which an intermediate film provides for damping of vibrations transmitted in particular by structure-borne conduction.

Abstract: The present invention relates to a vibration dampening/sound absorbing aircraft transparency which includes an outboard pane assembly, a vibration dampening/sound absorbing pane assembly and a spacer frame assembly for retaining the outboard pane assembly and the vibration dampening/sound absorbing pane assembly in spaced-apart generally parallel facing relationship to provide a space therebetween. The vibration dampening/sound absorbing pane assembly is a multilayer laminate which includes a substrate, an adhesive interlayer provided over a surface of the substrate and a sound dampening material layer provided over the adhesive interlayer and adhered by the adhesive interlayer to the substrate.

Abstract: Antinoise barrier including a perforated transparent panel fixed parallel to another solid transparent panel in such a way as to form an air interspace between the panels, with the perforated panel provided with holes having different dimensions.

Abstract: In the sound absorbing member, partition members each formed of sound absorbing material are disposed between first and second light transmissive sheet members to thereby form a plurality of small spaces, and first and second through holes are formed in the first and second sheet members, respectively, in such a manner that the first through holes communicate with other small spaces than the small spaces in communication with the second through holes.

Abstract: An acoustic glazing intended for land transportation vehicles and including first and second glass sheets separated by an interlayer region, wherein the acoustic transmission loss differs at most by 5 dB from a figure increasing of 9 dB per octave from 800 to 2000 Hz and of 3 dB per octave above that. As examples, double glazings or laminated glazings are presented featuring an interlayer with a pronounced damping. The acoustic glazing will then operate to effectively eliminate aerodynamic noises in moving vehicles.

Abstract: A glazing panel and hollow glazing panel, the hollow glazing panel including a first pane, a second pane held in spaced-apart, face-to-face relationship with the first pane, and a plurality of localized damping members positioned between the first and second panes, adherent thereto, and distributed therebetween over the area of the opposing faces thereof, wherein the first pane comprises a pair of vitreous sheets and an intervening layer of polymeric material separating the sheets of the pair and to which the sheets adhere, wherein the first pane has a shape, an area, and a total mass of vitreous material, and may be compared to a notional monolithic vitreous sheets having a coincidence frequency (.phi..sub.m) and a critical frequency of coincidence, wherein the first pane has a coincidence frequency (.phi..sub.

Abstract: A soundproof structure is provided at its surface with a lining of a catadioptric material which forms a light source when a light beam impinges on it.

Abstract: Ventilated soundproof glass including at least two sheets of glass and one sheet of plastic film in between. These two sheets of glass and the sheet of plastic film have holes arranged in them. The sides of the two sheets of glass adjacent to the sheet of plastic film have grooves, by which the air can pass through the ventilated soundproof glass while the noise is substantially reduced when it is propagating through the long courses of the grooves within the ventilated soundproof glass.

Abstract: The present invention is an acoustic panel having a porous layer and a generally rigid layer affixed to each other. The generally rigid layer includes at least one passageway opening on one side of the rigid layer and extending through the rigid layer to the porous layer. The porous layer is a fibrous material. The rigid layer is a concrete-type material, such as vermiculite-cement plaster. This acoustic panel further comprises a generally rigid planar surface positioned adjacent to the porous layer. This generally rigid planar surface can comprise an insulating layer affixed to the other side of the porous layer and a structural layer fastened to the insulating layer. The insulating layer is a polyurethane foam board. The structural layer is a particle board.

Abstract: A sound barrier (22) comprising a pair of spaced apart members (24,26), a medium (34) disposed between the members capable of propagating sound waves, and one or more acoustical resonators (30) coupled to the medium and tuned to one or more selected frequencies. The resonators may be disposed between the members or may be disposed around the outer periphery of the members to permit construction of a sound barrier window. The resonators may form an integral part of one of the members or may be suspended between the members by netting or sound insulating material.

Abstract: A sound barrier for isolating a noise source of the type emanating from manufacturing areas for food. The sound barrier comprises a panel made of sound attenuating material having a plurality of longitudinally extending side by side co-planar sections separated by V-shaped ribs so as to define a plurality of longitudinally extending side by side cavities. The cavities are provided with acoustical absorptive material therein so that the sound waves emanating from the noise source are first absorbed by the acoustical absorptive material and thereafter partly attenuated by the panel and partly deflected thereby so as to be absorbed again by the acoustical absorptive material. The panel is preferably transparent and portions of at least some cavities may be left free of acoustical absorptive material so as to provide undistorted vision from one side of the panel to the opposite side thereof. The sound barrier is intended to be disposed so that the open faces of the cavities confront the noise source.

Abstract: A sound barrier for isolating a noise source of the type emanating from manufacturing areas for food. The sound barrier comprises a panel made of sound attenuating material having a plurality of longitudinally extending side by side co-planar sections separated by V-shaped ribs so as to define a plurality of longitudinally extending side by side cavities. The cavities are provided with acoustical absorptive material therein so that the sound waves emanating from the noise source are first absorbed by the acoustical absorptive material and thereafter partly attenuated by the panel and partly deflected thereby so as to be absorbed again by the acoustical absorptive material. The panel is preferably transparent and portions of at least some cavities may be left free of acoustical absorptive material so as to provide undistorted vision from one side of the panel to the opposite side thereof. The sound barrier is intended to be disposed so that the open faces of the cavities confront the noise source.

Abstract: The present noise and heat insulating structural component may form a wall anel or a window element if the component is made of transparent material. Between two substantially parallel outer walls there is arranged at least one auxiliary damping wall forming a plurality of evacuated pockets each having a vaulted or domed surface when the auxiliary wall is substantially free of a load condition. The auxiliary wall may be secured to one or both of the outer walls, for example, by adhesive. Alternatively the auxiliary damping wall may be secured to a further inner wall member or it may be held in position only at its edges substantially intermediate between the outer walls.

Abstract: An acoustical-reflective ceiling panel for directing incident light from a remotely positioned light source toward a selected area and for attenuating ambient noise. The panel includes a plurality of pyramidal reflector units arranged in an array of rows and columns and a plurality of acoustical holes which trap the ambient noise to thereby reduce the noise level in the vicinity of the panel. The pyramidal reflector units each have reflective surfaces facing in different directions and are located in staggered rows in which the pyramidal reflector units in alternate rows form the columns. Light emitted from a light source positioned laterally with respect to the pyramidal reflector units is reflected off those reflective surfaces that face the light source onto the selected surface area.