Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
  • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
  • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
  • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
  • B32B17/10009—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets
  • B32B17/10036—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets comprising two outer glass sheets
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
  • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
  • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
  • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
  • B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
  • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
  • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
  • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
  • B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
  • B32B17/10559—Shape of the cross-section
  • B32B17/10568—Shape of the cross-section varying in thickness
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
  • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
  • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
  • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
  • B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
  • B32B17/10761—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer containing vinyl acetal
• • G—PHYSICS
  • G10—MUSICAL INSTRUMENTS; ACOUSTICS
  • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
  • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
  • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
  • G10K11/162—Selection of materials
  • G10K11/168—Plural layers of different materials, e.g. sandwiches
• • G—PHYSICS
  • G10—MUSICAL INSTRUMENTS; ACOUSTICS
  • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
  • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
  • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
  • G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/10—Properties of the layers or laminate having particular acoustical properties
  • B32B2307/102—Insulating
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
  • B32B2307/56—Damping, energy absorption
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2605/00—Vehicles
  • B32B2605/08—Cars

Definitions

• the present invention relates to laminated glazing for use as a head-up display (HUD) screen.
• Head-up display systems are useful in all types of vehicles, especially motor vehicles.
• the head-up display systems display information projected on a laminated glazing, which is reflected towards the driver or the observer. These systems allow in particular to give information to the driver of the vehicle without the driver away from the field of vision in front of the vehicle, to ensure safe driving. The driver then perceives a virtual image that is at a distance behind the windshield.
• a conventional laminated glazing is used for such a system, the driver observes a dual image: a first image reflected by the surface of the windshield facing the interior of the habitable and a second image reflected by the outer surface of the pare -brise, these two images being slightly offset relative to each other.
• This gap can disrupt the vision of information.
• PVB polyvinyl butyral interlayer
• an interlayer sheet is used, the thickness of which decreases from the upper edge of the glazing to the lower edge.
• Vehicle shapes have also been modified to improve air penetration and reduce turbulence which is itself a source of noise.
• Laminated glazing also has other advantages such as eliminating the risk of splashing fragments in case of sudden breakage, constitute a burglar-proofing device.
• the thickness of the glass sheet intended to be turned towards the outside of the vehicle is generally 2.1 mm and the thickness of the glass sheet intended to be turned towards the interior of the vehicle is generally 1.6 mm.
• lighter vehicles to reduce their consumption and the release of CO 2 .
• One way is to offer lighter automotive windows.
• One solution for reducing the weight of the glazings is to reduce the thickness of the glass sheets.
• this reduction in thickness causes degradation of the acoustic properties of the laminated glazing.
• the laminated glazing intended to be used as a head-up display system screen, the laminated glazing also having vibro-acoustic damping properties and which allows a reduction in the thickness of the glass sheets. without degradation of vibro-acoustic damping properties.
• the invention proposes a laminated glazing intended to be used as a head-up display system screen, comprising:
• a viscoelastic plastic interlayer disposed between the two sheets of glass, the interlayer comprising at least one layer of viscoelastic plastic material with vibroacoustic damping properties and the insert having a cross-section decreasing in wedge shape from the top to the bottom of the laminated glazing,
• the spacer is such that the resonant frequency f 2 of the second resonance mode of a 25 mm x 300 mm laminated glazing bar made of two glass sheets 2.1 mm thick each between which embedded in the interlayer, determined by a measurement of the mechanical impedance (MIM) at 20 ° C according to ISO 16940, is between 760 Hz and 1000 Hz and the loss factor ⁇ 2 of the second resonance mode of the same bar, determined by MIM under the same conditions, is greater than or equal to 0.25 a viscoelastic plastic interlayer intended to be incorporated between two sheets of glass to form a laminated glazing unit having vibroacoustic damping properties, the interlayer comprising at least one layer of viscoelastic plastic material with vibroacoustic damping properties, the interlayer being such that the resonance frequency f 2 of the second resonance mode of a bar 25 mm x 300 mm laminated glazing consisting of two 2.1 mm thick glass sheets between which the spacer is incorporated, determined by measuring the mechanical impedance (M
• the layer is based on polyvinylbutyral and plasticizer.
• the glass sheets are curved.
• the resonance frequency f 2 is between 800 and 900 Hz, preferably between 800 Hz and 850 Hz.
• the loss factor ⁇ 2 is greater than 0.30.
• the interlayer further comprises two outer layers of standard PVB, the layer being between the two outer layers. According to another particularity, only one of the two outer layers has a cross-section decreasing wedge-shaped from top to bottom of the laminated glazing, the viscoelastic plastic material layer with vibro-acoustic damping properties and the other layer external having a constant cross section from the top to the bottom of the laminated glazing.
• the two outer layers have a cross-section decreasing wedge-shaped from the top to the bottom of the laminated glazing, the layer of viscoelastic plastic material with vibro-acoustic damping properties having a constant cross-section from the top to the bottom. bottom of the laminated glazing.
• the measurement of the mechanical impedance is performed at least one month after assembly of the laminated glazing bar, the laminated glazing bar having itself been assembled at least 1 month after the manufacture of the interlayer.
• the invention also relates to a glazing unit comprising:
• one of the glass sheets has a thickness of between 0.5 mm and 2.6 mm
• one of the glass sheets has a thickness of between 0.5 mm and 1.6 mm
• the total thickness of the glass sheets being strictly less than 3.7 mm.
• the invention also relates to a motor vehicle comprising a glazing unit described above, the glass sheet having a thickness of between 0.5 mm and 2.6 mm being turned towards the outside of the vehicle and the thick glass sheet between 0.5 mm and 1, 6 mm being turned towards the inside of the vehicle.
• the invention also relates to a use of the glazing described above as a motor vehicle windshield.
• Figure 1 shows a curve of sound insulation as a function of frequency, measured on three windshields
• Figure 2 shows a sectional view of a glazing according to the invention.
• the invention relates to a laminated glazing intended to be used as a head-up display system screen, comprising two glass sheets and a viscoelastic plastic interlayer disposed between the two sheets of glass, the interlayer comprising at least one layer of material viscoelastic plastic with vibro-acoustic damping properties and the insert having a cross-section decreasing wedge-shaped from top to bottom of the laminated glazing.
• the spacer is such that the resonant frequency f 2 of the second resonance mode of a laminated glazing bar with a surface area of 25 mm x 300 mm composed of two glass sheets 2.1 mm thick each between which incorporated the interlayer, determined by a measurement of the mechanical impedance (MIM) at 20 ° C according to ISO 16940 (with a single difference regarding the thickness of the glass sheets of the bar which is 2.1 mm instead of 4 mm), is between 760 Hz and 1000 Hz and the loss factor ⁇ 2 of the second resonance mode of the same bar, determined by MIM under the same conditions, is greater than or equal to 0.25.
• MIM mechanical impedance
• an interlayer comprising these features makes it possible to obtain a thin laminated glazing with acoustic performances equivalent to or even greater than those of a laminated glazing unit with conventional glass thicknesses. incorporating an interlayer with known improved acoustic properties.
• FIG. 2 shows a sectional view of a glazing unit according to the invention.
• the glazing comprises two sheets of glass 1, 2 between which is inserted the interlayer according to the invention.
• the interlocking of the interlayer with the glass sheets is carried out by known means, for example by stacking the glass sheets and the interlayer and by passing the assembly in an autoclave.
• the glass sheet 1 of the glazing is intended to be turned towards the outside of the vehicle while the glass sheet 2 is intended to be turned towards the inside of the vehicle.
• the glass sheet 1 is preferably thicker than the glass sheet 2 so that the glazing allows better protection against external attacks (inclement weather, projection of chippings, etc.). Indeed, the thicker the glass, the more mechanically resistant it is. However, the thicker the glass, the heavier it is. We must therefore find a compromise between the re- mechanical resistance and the weight of the glazing.
• the thickness of the glass sheet 1 is for example between 0.5 mm and 2.6 mm, preferably between 1.4 and 2.0 mm and the thickness of the glass sheet 2 is for example between 0.5 mm and 1, 6 mm, preferably between 1, 1 and 1.5 mm.
• the thickness of the glass sheet 1 is generally 2.1 mm and the thickness of the glass sheet 2 is generally 1.6 mm, ie a total glass thickness of 3, 7 mm.
• the glazing according to the present invention comprises a total glass thickness strictly less than 3.7 mm, preferably less than or equal to 3.2 mm.
• the thickness of the glass sheet 1 is the thickness of the glass sheet 1 .
• the thickness of the glass sheet 2 is 1.4 mm to limit the weight of the glazing, which reduces the fuel consumption of a vehicle equipped with such a glazing. It also makes it easier to handle the glazing and save material.
• the glazing according to the invention may also have a glass sheet 1 having a thickness of 1.6 mm and a glass sheet 2 having a thickness of 1.2 mm, or a glass sheet 1 having a thickness of 1.4 mm and a thickness of 1 mm. glass sheet 2 of thickness 1, 1 mm.
• the interlayer consists of at least one viscoelastic plastic layer 3 with vibroacoustic damping properties. It is preferably based on polyvinylbutyral and plasticizer. The rate and the nature of the plasticizer and the degree of acetalization of the polyvinyl butyral make it possible to play in a known manner on the rigidity of a component based on polyvinyl butyral and plasticizer.
• the spacer also comprises two layers 4, 5, said outer layers, between which is inserted the layer 3.
• the outer layers 4, 5 are preferably standard PVB.
• the interlayer may comprise at least two viscoelastic plastic layers with vibro-acoustic damping properties, surrounded or not by standard PVB layers.
• the acoustic characteristics of the interlayer are determined by measuring the mechanical impedance (MIM) at 20 ° C according to ISO 16940 of a laminated glass pane with a surface area of 25 mm x 300 mm made of two sheets 2.1 mm thick glass (and not 4 mm as recommended in ISO 16940) each between which is incorporated a spacer according to the invention, that is to say an interlayer comprising at least one layer of viscoelastic plastic with vibro-acoustic damping properties.
• MIM mechanical impedance
• the MIM makes it possible to determine resonance frequencies and loss factors of the various resonance modes of the laminated glazing bar.
• the spacer is according to the invention if the resonance frequency f 2 of the second resonance mode of the laminated glazing bar determined by MIM is between 760 Hz and 1000 Hz and the loss factor ⁇ 2 of the second resonance mode of the bar. of laminated glazing determined by MIM is greater than or equal to 0.25.
• the resonant frequency f 2 is between 800 Hz and 900 Hz, which makes it possible to have improved acoustic performances by degrading less the level of weakening of the laminated glazing before the critical frequency. More preferably, the resonant frequency f 2 is between 800 Hz and 850 Hz, which makes it possible to have further improved acoustic performance by further degrading the attenuation level of the laminated glazing before the critical frequency.
• the loss factor ⁇ 2 is greater than 0.30, which makes it possible to have improved acoustic performance by improving the acoustic damping.
• the measurement of the mechanical impedance (MIM) is carried out at least 1 month after assembly of the laminated glazing bar, the laminated glazing bar having itself been assembled at least 1 month after the manufacture of the interlayer. This makes it possible to be sure that the interlayer and the laminated glazing have reached stable states and thus to determine reliable values.
• Figure 1 shows a curve of sound insulation as a function of frequency, measured on three windshields.
• the acoustic insulation of a glazing unit accounts for the acoustic performance that can be observed on a vehicle equipped with said glazing.
• a first windshield (21 -16 known) comprises:
• interlayer comprising two outer layers of standard PVB and a viscoelastic plastic core layer with vibro-acoustic damping properties, the interlayer having a resonance frequency f 2 of 675 Hz ( ⁇ 15 Hz) and a loss factor ⁇ 2 equal to 0.35 ( ⁇ 0.03).
• the first windshield corresponds to a conventional windshield with an interlayer with known acoustic damping properties.
• the sound insulation curve (represented by diamonds) of the first windshield shows a hollow around 6500 Hz.
• a second windshield (18-14 known) includes:
• interlayer comprising two outer layers made of standard PVB and a viscoelastic plastic core layer with vibroacoustic damping properties, the interlayer having a resonance frequency f 2 of 675 Hz ( ⁇ 15 Hz) and a loss factor ⁇ 2 equal to 0.35
• the second windshield is a thinned windshield with an interlayer identical to that of the first windshield.
• the acoustic insulation curve (represented by squares) of the second windshield shows a behavior similar to that of the first windshield up to 5000 Hz, but a hollow shifted towards the high frequencies, towards 8000 Hz.
• the hollow is very troublesome because it implies that this windshield lets airborne sounds at high frequencies that are annoying to the human ear.
• a third windshield (18-14 invention) comprises:
• interlayer comprising two outer layers made of standard PVB and a viscoelastic plastic core layer with vibroacoustic damping properties, the interlayer having a resonance frequency f 2 of 800 Hz ( ⁇ 15 Hz) and a loss factor ⁇ 2 equal to 0.30
• the third windshield is a thinned windshield with a spacer according to the invention.
• the acoustic insulation curve (represented by triangles) of the third windshield shows a behavior similar to that of the first windshield, with a recentered hollow around 6500 Hz and sound insulation values similar to those of the first windshield. broken.
• the windshield with an interlayer according to the invention therefore makes it possible to compensate for the acoustic degradation associated with the thinning of the glazing.
• the laminated glazing according to the invention can be used as a windshield for a motor vehicle.
• it satisfies all the requirements of United Nations Regulation No. 43 (known as R43) to withstand hard shocks to ensure its mechanical strength.
• R43 United Nations Regulation No. 43
• the thickness of these outer layers 4, 5 is for example adapted in known manner, for example by the patent application FR 09 52567.
• the insert has a cross-section decreasing in wedge-shaped form from the top to the bottom of the laminated glazing unit.
• the layer 3 of viscoelastic plastic material with vibro-acoustic damping properties having a constant cross section from the top to the bottom of the laminated glazing.
• the two sheets of glass 1, 2 are curved.

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• Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• Acoustics & Sound (AREA)
• Multimedia (AREA)
• Joining Of Glass To Other Materials (AREA)
• Laminated Bodies (AREA)

Applications Claiming Priority (2)

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Family Applications (1)

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Citations (1)

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• 2013
  • 2013-11-27 FR FR1361723A patent/FR3013630B1/fr active Active
• 2014
  • 2014-11-25 CN CN201910317476.0A patent/CN110001163A/zh active Pending
  • 2014-11-25 CA CA2930369A patent/CA2930369C/fr active Active
  • 2014-11-25 KR KR1020167013666A patent/KR102309793B1/ko active IP Right Grant
  • 2014-11-25 US US15/039,472 patent/US9770888B2/en active Active
  • 2014-11-25 EA EA201691098A patent/EA031385B1/ru not_active IP Right Cessation
  • 2014-11-25 JP JP2016534734A patent/JP6546171B2/ja active Active
  • 2014-11-25 CN CN201480002530.8A patent/CN104853914A/zh active Pending
  • 2014-11-25 MX MX2016006556A patent/MX2016006556A/es unknown
  • 2014-11-25 WO PCT/FR2014/053026 patent/WO2015079158A1/fr active Application Filing
  • 2014-11-25 EP EP14821741.7A patent/EP3074222A1/fr active Pending
  • 2014-11-25 BR BR112016011362-4A patent/BR112016011362B1/pt active IP Right Grant

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