SK26698A3 - Display screens incorporating loudspeakers - Google Patents

Display screens incorporating loudspeakers Download PDF

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Publication number
SK26698A3
SK26698A3 SK266-98A SK26698A SK26698A3 SK 26698 A3 SK26698 A3 SK 26698A3 SK 26698 A SK26698 A SK 26698A SK 26698 A3 SK26698 A3 SK 26698A3
Authority
SK
Slovakia
Prior art keywords
panel
characterized
projection screen
acoustic
member
Prior art date
Application number
SK266-98A
Other languages
Slovak (sk)
Inventor
Henry Azima
Martin Colloms
Neil Harris
Original Assignee
New Transducers Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
Priority to GBGB9517918.0A priority Critical patent/GB9517918D0/en
Priority to GBGB9522281.6A priority patent/GB9522281D0/en
Priority to GBGB9606836.6A priority patent/GB9606836D0/en
Application filed by New Transducers Ltd filed Critical New Transducers Ltd
Priority to PCT/GB1996/002137 priority patent/WO1997009853A2/en
Publication of SK26698A3 publication Critical patent/SK26698A3/en
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=34865232&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=SK26698(A3) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00Diaphragms for electromechanical transducers; Cones
    • H04R7/02Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04Plane diaphragms
    • H04R7/045Plane diaphragms using the distributed mode principle, i.e. whereby the acoustic radiation is emanated from uniformly distributed free bending wave vibration induced in a stiff panel and not from pistonic motion
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00Stereophonic arrangements
    • H04R5/02Spatial or constructional arrangements of loudspeakers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00Diaphragms for electromechanical transducers; Cones
    • H04R7/02Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04Plane diaphragms
    • H04R7/06Plane diaphragms comprising a plurality of sections or layers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2307/00Details of diaphragms or cones for electromechanical transducers, their suspension or their manufacture covered by H04R7/00 or H04R31/003, not provided for in any of its subgroups
    • H04R2307/029Diaphragms comprising fibres
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10General applications
    • H04R2499/15Transducers incorporated in visual displaying devices, e.g. televisions, computer displays, laptops

Abstract

A display screen (32), e.g. a projection screen comprising a panel having a light reflective surface, characterised in that the screen is a distributed mode acoustic radiator loudspeaker having a transducer (9) mounted wholly and exclusively thereon to vibrate the radiator to cause it to resonate to provide an acoustic output.

Description

Projection screen with built-in speakers

Technical field

The invention relates to a projection screen.

BACKGROUND OF THE INVENTION

From a patent panel loudspeaker, a pick-up element constituting the two surface layers of the structure, being arranged so as to relieve stiffness in the panel of surfaces and, in particular, but not exclusively,

GB-A-2,262,861 is a known design consisting of a multifunctional fire brace which unit sandwich panel formed from a spatially core material transversely that its bending ratio (b) in all directions to the square of mass consists of: attaches to an electromechanical which serves as a frequency unit of surface area (μ) is at least 10, and which further comprises a fastener which carries the panel or its support loosely and without damping, and further an excitation means coupled to excite the multi-modal resonance in the electric speaker.

US-A-5,025,474 consists of a response band with a panel, a radiation input in the range of

MATSUSHITA is mentioned

In a patent connection of a screen and a loudspeaker, where the loudspeaker has a box-like housing formed with an inlet, it acts as a bass-reflex low frequency.

In the patent specification, a low frequency on the frame and the excitation of an electromagnetic transducer also mounted on the frame is of importance.

so loudspeaker loudspeaker to increase its performance at

US-A-3,247,925 WARNAKA discloses which resonant panel speaker mounted

SUMMARY OF THE INVENTION

The present invention uses members whose species, structure and arrangement are generally described or described in related application WO 97/09842 with the same priority. Such members have the ability to maintain and propagate the input vibration energy by bending waves in the operating area or operating areas extending transversely to their thickness, often, but not necessarily, to their edges, these members being arranged with or without anisotropy, with resonant mode vibration components distributed in this region, preferably for acoustic communication with the environment and predetermined priority locations in the region for locating the transducer, in particular for operating or moving parts thereof, which are effective with respect to the acoustic vibration activity in this region, and to signals, usually electrical, corresponding to the acoustic content of this vibration action. The use is envisaged in co-pending application WO 97/09842 with the same priority as / or in passive acoustic devices without transducers as for reverberation or acoustic filtering or acoustic sounding of a room or room, and / or in active acoustic devices with transducers as notably a wide range of sound sources or speakers when powered by input signals to convert to said sound or as microphones when exposed to sound to convert it to other signals.

In particular, the present invention relates to a projection screen with a built-in acoustic device, for example in the form of speakers.

Said members are referred to as distributed mode acoustic radiators and have the characteristics described in the related PCT application or other characteristics described in this patent application.

The invention consists of a projection surface consisting of a panel with a light reflecting or radiating surface, characterized in that the projection surface is formed by a member capable of maintaining and propagating input vibration energies by bending waves in at least one operating area extending transversely to its thickness with vibration components of resonance modes distributed at least in this region, and with predetermined priority locations in the region for locating the transducer, the transducer being mounted on the member at one of these locations, to cause vibration of the member, to induce its resonance to form an acoustic radiator panel forming acoustic during resonance output. The radiator panel may be a rigid lightweight panel with a lightened core sandwiched between two high module cover layers. The core may be an aluminum foil honeycomb structure. The cover layers may consist of fiber-reinforced plastic. The projection surface may be provided with a support frame arranged around the periphery of the radiator panel. A resilient frame may be used to secure the radiator panel to the support frame. Panel loudspeakers may be attached to opposite sides of the support frame to produce left and right information. The left and right loudspeakers can be hinged on the support frame hinged against the radiation panel in the storage position. The left and right loudspeakers may be a member having the ability to maintain and extend the input vibration energy by bending waves in at least one operating region extending transversely to its thickness, with resonant mode vibration components distributed at least in this region, and with predetermined preferential locations in that region. positioning the transducer, the transducer being mounted on the member at one of these locations, to cause the member to vibrate, to induce its resonance forming an acoustic radiating panel producing an acoustic output during resonance. The projection screen may be a projection screen.

In another aspect, the invention is an audiovisual device having a projection screen. The audiovisual device may be provided with at least one rear channel loudspeaker comprising a member capable of maintaining and extending the input vibration energy by bending waves in at least one operating region extending transversely to its thickness, with resonant mode vibration components distributed at least in this region and having predetermined preferential locations in the region for accommodating the transducer, the transducer being mounted entirely and exclusively on the member at one of these locations, to induce vibration of the member, to induce its resonance to form an acoustic radiating panel producing an acoustic output during resonance.

BRIEF DESCRIPTION OF THE DRAWINGS

For a better understanding of the invention, exemplary embodiments of the invention are illustrated in the accompanying drawings, in which: FIG. 1 shows an exploded loudspeaker as described and claimed in co-pending application WO 97/09842; FIG. 2a shows a partial section of the loudspeaker according to line A-A of FIG. 1, FIG. 2b shows an enlarged and cross-sectional view of the loudspeaker of FIG. 2a showing two alternative constructions, FIG. 3 is a schematic and perspective view of an embodiment of a screen according to the present invention; FIG. 4 is a partial view showing a detail of the screen of FIG. 3 and FIG. 5 is a plan view of the room equipped with the projection screen of FIG. Third

DETAILED DESCRIPTION OF THE INVENTION

In FIG. 1, a panel loudspeaker 81 of the type described and claimed in co-pending application WO 97/09842 with the same priority is shown, having a rectangular support frame 1 surrounding its inner periphery with a flexible frame 3 supporting the distributed sound radiating panel 2. Loudspeaker 81 is further provided with a transducer 9, which is described in detail in, for example, the related applications WO 97/09859, WO 97/09861 and WO 97/09858 with the same date, and which is mounted entirely and exclusively on this or this panel 2, in a predetermined a location defined by the coordinates x and y, the position of which is calculated as described in related application WO 97/09842 with the same priority, to transmit bending waves to the sound radiating panel, to induce panel resonance, to produce an acoustic output.

The transducer 9 is driven by a signal amplifier 10, for example a low-frequency amplifier connected to the transducer j) by means of conductors 28. The load and power requirement of the amplifier 10 can be quite normal, similar to conventional cone speakers, with a sensitivity of 86-88 dB / W in idle conditions. The amplifier load impendency is strongly resistive at 6 Ω, at 20 to 80 W load. When the core of the panel and / or the metal coverings are metal, they may act as a heat sink to dissipate heat from the coil and thus improve loadability.

In FIG. 2a and 2b show typical cross-sections of the loudspeaker 81 of FIG. 1. FIG. 2a, it is shown that the support frame 11 surrounding the flexible frame 2 and the panel 2 are joined together by respective glued joints 20. Suitable materials for the support frame are lightweight frame structures, for example, picture frames of extruded metal, for example aluminum alloys or plastics. Suitable materials for the resilient frame are resilient materials such as foam rubber and foam plastics. Suitable adhesives for bonding joints 20 are epoxy, acrylic and cyanoacrylic adhesives, and the like.

In FIG. 2b is shown to an enlarged extent that the panel 2 is a rigid light panel consisting of a core 22, for example a rigid plastic foam 97 of cross-linked polyvinyl chloride or a lightweight construction 98, i. j. of a honeycomb structure of metal foil, plastics or the like, with chambers extending transversely to the plane of the panel 2, the core 22 being enclosed between opposing cover layers 21, for example of paper, cardboard, plastic or metal foil or sheet. When the cover layers 21 are plastic, they can be reinforced in a known manner by fibers, for example carbon, glass, Kevlar (RTM) or the like, to increase their modulus.

The envisaged liner and reinforcement materials thus include carbon, glass, Kevlar (RTM), Nomex (RTM), ie, aramid and the like fibers in different layers and weaves, as well as paper, laminated paper, melamines and various high synthetic plastic films modules such as Mylar (RTM), Kaptan (RTM), polycarbonates, phenolic plastics, polyesters or related plastics and fiber reinforced plastics, etc., and metal foils or sheets. Research on the Vectra grade of liquid crystal polymer thermoplastics shows that they can be useful for producing ultra-thin coatings or coatings of smaller sizes, up to about 30 cm in diameter, by injection molding technology. This material itself forms an oriented crystalline structure in the injection direction, which is an advantageous orientation for propagating energy with high sound frequencies from the excitation point to the periphery of the panel. Further, the injection of these and other thermoplastics allows the positioning and alignment features such as grooves or rings to accurately position the components of the transducer, such as a coil and a magnet suspension, to be provided in the injection molding tools. It is further contemplated with some of the weaker core materials that locally increasing the thickness of the coating, for example in the region of the annulus, up to 150% of the converter diameter, to strengthen this region and advantageously double the vibration energy into the panel. In this way, the high frequency response is improved by the softer foam material. The envisaged core layer materials include industrially manufactured honeycomb or corrugated sheet metal or foil sheets of aluminum alloy or Kevlar (RTM), Nomex (RTM), uncoated paper or cardboard and various synthetic plastic sheets, as well as lightweight or foamed plastic or fibrous materials , even aerogel metals, if they have a suitable low density. Some suitable core layer materials are characterized by efficient self-drawing in their manufacture and / or otherwise have sufficient intrinsic rigidity for use without the need for lamination between layers. The high performance lightweight core material is known under the trade name Rohacell, which may be suitable as a radiant panel and which is free of covering layers. From a practical point of view, the aim is an overall light and rigid material suitable for special purposes, including in particular the best contribution of the layer to the cores and cover layers and the transition between them. Some preferred panel material compositions include metal and metal alloy coating layers or alternatively carbon fiber reinforced materials. Both these materials, as well as designs with an Airgel alloy or a metal honeycomb core, have important RF shielding properties that should be of importance in some EMC (Electromagnetic Compability) applications. Conventional cone-type panels or loudspeakers do not have intrinsic electromagnetic compatibility capability in shielding. Preferred embodiments of piezoelectric or electrodynamic transducers furthermore have negligible electromagnetic radiation or stray magnetic fields. Conventional loudspeakers have a large magnetic field, up to a distance of 1 m, unless specific compensating countermeasures are taken. Where it is important to maintain shielding during use, the conductive portions of the respective DML (Data Manipulation Language) panel may be electrically connected, or an electrically conductive foam or similar interface may be used to connect the edges of the panel. The resilient frame 2 can damp the edges of the panel 2 to prevent excessive movement of these edges. Further or alternatively, further damping may be used, for example by means of damping pads glued to the panel at selected locations, to damp excessive panel movements, to ensure a uniform distribution of resonance across the panel. The pads may be of bitumen-based material typically used for a loudspeaker housing, or may be of a flexible or rigid polymeric sheet material. Some materials, especially paper and board, and some cores may be self-limiting. On request, damping can be increased by constructing the panel using flexible rather than rigid fixation adhesives.

This effective selective damping involves specifically attaching the damping means to the panel, including its layers, which permanently bond to it. The edges and corners may be particularly important for the predominant and less dispersed types of panel vibration at low frequency. Attaching the damping means to the edges may result in a panel whose layers are completely framed, although its corners may often be relatively loose, to the desired extension in low frequency operation. The attachment can be by adhesive or self-adhesive materials. Other types of useful damping means, in particular with respect to finer effects and / or middle and higher frequencies, may be attached to the layers at predetermined intermediate positions in the region in the form of suitable materials.

The described acoustic panel is two-dimensional. The sound energy from his rear face is not strongly phased with the energy from his front face. This implies the advantage of the total sum of the acoustic power in the room, the distribution of sound energy with equal frequency, reduced effects of reflected and still wines, together with the advantage of excellent reproduction of the natural space and environment in the reproduced sound recording.

Although radiation from the acoustic panel is largely non-directional, the percentage of phase information increases off-axis. For improved focus on the artificial stereo signal, for the position of the announcer, and for images, at the usual height of the standing person, the benefit of a slight offset for a normal seated listener contributes to optimizing the stereo effect.

Also, the triangular left / right geometry with respect to the listener creates an additional angular component. Thus good stereo reception is achievable.

Compared to the reproduction of a conventional loudspeaker, there is another advantage for one group of listeners. The intrinsically dispersed nature of the sound emitted by the acoustic panel gives it a sound volume that is not governed by the law of indirect dependence on the square of the distance for an equivalent point source. Since the intensity decreasing with distance is much lower than the law of indirect dependence on the square of distance, for off-center or poorly positioned listeners, the magnetic field strength of the panel speaker increases the stereo effect compared to conventional speakers. This is because the off-center listener does not suffer from the double problems caused by the proximity of the proximal speaker, first by increasing the volume from the proximal speaker excessively, and then by correspondingly reducing the volume from the distal speaker.

Another advantage of the flat light panel loudspeaker is that it is visually attractive, has good sound quality and requires only a transducer and not a full-range speaker crossover from each panel membrane.

In FIG. 3 shows a multimedia audio-visual system comprising a film projector 31 adapted to project an image onto a screen 32, comprising a loudspeaker panel of the type shown in FIG. 1 and 2.

The projection screen 32 with the loudspeaker consists of a panel 2 consisting of aluminum or carbon fiber reinforced liners 21, with a sandwiched core 22 formed of a honeycomb structure of aluminum foil. The projection screen with a panel size of 1.22 x 1.38 m may have a thickness of 300 gm of aluminum covering layers. The core thickness may be 11 mm and the size of the honeycomb structure may be 9.5 mm. Such a panel is rigid, low density, high modulus of strength and isotropic.

Two smaller auxiliary panel speakers 114 of the type shown in FIG. 3 are connected to the opposite sides of the primary projection screen 32 formed by the panel and the speaker. 1 and 2. These sub-panel loudspeakers 114 may be lowered relative to the primary screen 32 when not in use, and may be swung to the operating position as shown in FIG. These sub-panel loudspeakers 114 are arranged to receive and emit respective left and right information, for example, in stereo operation.

The auxiliary panel loudspeakers 114 may be formed with provided plastic covering layers, fibers.

The panels 2 are provided with aluminum-reinforced coverings 21 which are reinforced with carbon on one or both of these decorative decorative foils, for example of polyester.

foil or layer or glass may be

The core 22 of the auxiliary panel loudspeakers 114 may be made of plastic film, for example in the form of a honeycomb structure, or may be of paper. When paper is used, it can be impregnated with a plastic material, such as a phenolic compound, to increase the stiffness of the paper. The size of the cells may be in the range of 3 to 6 mm and the thickness of the core 22 may be 3 to 10 mm. When the cover layers 21 are of aluminum foil, they may have a thickness of 25 to 100 μπι. An epoxy adhesive may be used to join the panel.

Stereo reproduction, i. j. Dual-channel sound reproduction means creating a sound illusion state, including the sound source location properties, the spatial arrangement, and the original recording environment. Stereo broadcasting with conventional speakers is important in terms of the artificial location of the sound source and, in some cases, the spatial arrangement, but is weaker in terms of the expression of natural space and environment. This is because the near-point nature of the sound source of a conventional piston loudspeaker facilitates aural definition of its physical position, which is contrary to the requirement to locate the overall stereo acoustic image.

It is often said that loudspeakers as reproducing devices should dissolve into a state of sound illusion. Part of the problem lies in the relatively narrow, forward-radiating directionality of conventional speakers. In addition, balancing the sound towards the sides and the rear face of the speaker housing, the sound that strongly affects the sound field of the reverberation in the room, is colored and unbalanced by substantial variations in the frequency response. This reduces the feeling of natural acoustic space and environment.

In the embodiment of FIG. 3, a pair of left and right channel acoustic panel loudspeakers are used that are set to provide complex vibration over the entire area over a wide frequency range, typically 100-20 kHz. A central projection screen 32 formed by a loudspeaker panel as shown in FIG. 3, it is suspended on the suspension means 33, but may alternatively be supported, for example, by a stand.

In FIG. 5 illustrates how a projection apparatus according to the invention can be arranged in a room 145 equipped with seats 146. The apparatus has a film projector 31 for projecting an image onto a screen 32, and is also provided with a pair of auxiliary depth depths.

Loudspeakers 35 arranged on the sides of the room, which may be of conventional construction, to improve the bass response and a pair of loudspeakers 117 for rear effect, i. j. called. loudspeakers to reproduce the environment, arranged in the back of the room. Suitable rear effect speakers 117 are those of the type shown in FIG. 1 and 2 with respect to their broad and uniform sound propagation characteristics. These rear effect loudspeakers 117 may be of the same design as the sub-panel loudspeakers 114.

The panel speaker of FIG. 1 and 2 have remarkable directed properties. For acoustic reproduction of the sound system environment, the energy must be widely distributed, ideally from non-directed sources. It is important that the sound source is not well located, otherwise the perception of the large surrounding space and the simulated acoustic area behind the listener are not satisfactory.

To date, conventional directional and / or low-source loudspeakers, usually moving-coil loudspeakers, are used for acoustic reproduction of the environment. Due to the phenomenon of auditory perception intensity, listeners seated close to the adjacent loudspeaker to reproduce the environment have a strongly localized perception of this loudspeaker, which considerably worsens the effect of the environment and their overall appreciation of the multichannel sound field. The localization can be so strong that the audience's attention is diverted from the primary front audio channels, which is related to the Haas effect, which enhances the localization of closer sources.

An environment reproduction system constructed with one or more of the speakers of FIG. 1 and 2, it delivers a large sound field or an almost uniform intensity that is deliberately poorly localized. It can accommodate a large number of listeners, even several people in close proximity (the nearest 0.5 m) to panel speakers without any significant location of the immediate reproductive channel and with the inevitable ability to hear the important front channels undisturbed. With this multi-channel audio reproduction system, a strongly improved realistic listening experience as a whole is achieved as a result of the desired radiating characteristics of the acoustic panel acoustic speaker.

The loudspeakers for environmental reproduction may, if desired, be hung on wires and may be masked by attaching a suitable image to the panel 2 resembling the image.

As shown in FIG. 4, a back sleeve 36 may be provided on the projection panel support frame 7 to cover the flexible frame 3. The frames of the sub-panel speakers 114 and the rear effect speakers 117, respectively. The reproduction environment can be modified similarly.

Industrial usability

The acoustic panel, made in sufficient size as a projection screen for slides, film projection and video projection, thus forms an audio speaker at the same time, for example, for the central or dialogue channel of a home theater. Only acoustic panels according to the invention, say with a width of more than 0.6 m, provide very good acoustic coverage for the audience. Operational demonstration has shown great clarity and clarity throughout the area to the audience with the great advantage that those closest to the screen do not suffer the deafening noise of an excessively close sound level, a constant defect of conventional direct-beam cone speakers.

Furthermore, there is a second and unique aspect of the screen of the invention. With conventional center channel speakers, the ear can more easily locate the acoustic center of the speaker. All sounds seem to come from this concentrated little source, reducing the sense of realistic tapping. In this acoustic panel, its unique non-directional radiation capability means that sound comes from the general acoustic area of the screen, but not from a single isolated point. When the image in this panel combines with sound, a strong synesthetic effect occurs. The desired lack of specific sound localization here freely combines the combination of visual and intellectual perception with the virtual and approximate position of the sound sources represented, synchronized with the position represented by the visual impression on the acoustic surface.

With well-recorded portions of the dialogue, not only does the virtual acoustic image follow a visual image, it can also convey the information required to perceive depth and distance. The quality of audience engagement in the film experience will significantly increase.

Claims (10)

  1. A projection surface consisting of a panel with a light reflecting or radiating surface, characterized in that the projection surface is formed by a member (2) capable of maintaining and propagating the input vibration energy by bending waves in at least one operating area extending transversely to its thickness with vibration components resonant modes distributed at least in this region, and with predetermined preferential locations in the region for locating the transducer, the transducer (9) being mounted entirely and exclusively on the member in one of these vibration inducing locations to generate resonance thereof an acoustic radiating panel (2) producing an acoustic output during resonance.
  2. Projection surface according to claim 1, characterized in that the radiating panel (2) is a rigid lightweight panel with a lightened core (22) sandwiched between two high-module covering layers (21).
    3. Projection screen by claim 2 characterized ú c and sa by being equipped supporting frame (D Arranged around circuit radiation panel (2) 1. 4. Projection screen by claim 3 characterized ú c and sa
    in that the radiation panel (2) is fixed in the support frame (1) by a flexible frame (3).
  3. Projection screen according to claims 2 to 4, characterized in that the core (22) is formed by a honeycomb structure (98) of aluminum foil.
  4. Projection surface according to claims 2 to 5, characterized in that the cover layers (21) are fiber-reinforced plastic.
  5. Projection screen according to the preceding claims, if dependent on claim 3, characterized in that panel speakers (114) are connected to opposite sides of the support frame (1) to produce left and right-hand information.
  6. Projection screen according to claim 7, characterized in that the left and right loudspeakers (114) are hinged on the support frame (1) in a storage position relative to the radiating panel (2).
  7. Projection screen according to claim 7 or 8, characterized in that the left and right loudspeakers (114) form a member (2) capable of maintaining and propagating the input vibration energy by bending waves in at least one operating region extending transversely to its thickness, having resonant mode vibration components distributed at least in this region, and predetermined priority locations in the region for locating the transducer, the transducer (9) being mounted entirely and exclusively on this member at one of these locations to cause vibration of the member to induce its a resonance forming an acoustic radiation panel (2) producing an acoustic output during resonance.
  8. Projection screen according to claims 1 to 9, characterized in that the projection screen (32) is a projection screen.
  9. An audiovisual device, characterized in that it comprises a projection screen (32) according to claim 10.
  10. An audiovisual device according to claim 11, characterized in that it is equipped with at least one rear channel speaker (117) formed by a member (2) capable of maintaining and extending the input vibration energy by bending waves in at least one operating region extending transversely to its thickness. , with resonant mode vibration components distributed at least in this region, and with predetermined priority locations in the region for locating the transducer, the transducer (9) being mounted entirely and exclusively on this member at one of these locations to cause vibration of the member to cause its resonance forming an acoustic radiation panel producing an acoustic output during resonance.
SK266-98A 1995-09-02 1996-09-02 Display screens incorporating loudspeakers SK26698A3 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GBGB9517918.0A GB9517918D0 (en) 1995-09-02 1995-09-02 Acoustic device
GBGB9522281.6A GB9522281D0 (en) 1995-10-31 1995-10-31 Acoustic device
GBGB9606836.6A GB9606836D0 (en) 1996-03-30 1996-03-30 Acoustic device
PCT/GB1996/002137 WO1997009853A2 (en) 1995-09-02 1996-09-02 Display screens incorporating loudspeakers

Publications (1)

Publication Number Publication Date
SK26698A3 true SK26698A3 (en) 1998-09-09

Family

ID=34865232

Family Applications (1)

Application Number Title Priority Date Filing Date
SK266-98A SK26698A3 (en) 1995-09-02 1996-09-02 Display screens incorporating loudspeakers

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Country Link
EP (1) EP0847670B1 (en)
JP (1) JPH11512245A (en)
CN (1) CN1195461A (en)
AT (1) AT177579T (en)
AU (1) AU702865B2 (en)
BR (1) BR9610553A (en)
CA (1) CA2234944A1 (en)
CZ (1) CZ58598A3 (en)
DE (2) DE69601729T2 (en)
DK (1) DK0847670T3 (en)
EA (1) EA000619B1 (en)
ES (1) ES2130845T3 (en)
HK (1) HK1008646A1 (en)
HU (1) HU9901396A3 (en)
IL (1) IL123486A (en)
NZ (1) NZ316543A (en)
PL (1) PL325235A1 (en)
RO (1) RO119050B1 (en)
SK (1) SK26698A3 (en)
TR (1) TR199800362T1 (en)
WO (1) WO1997009853A2 (en)

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NZ316543A (en) 1998-10-28
EP0847670A1 (en) 1998-06-17
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AU6880196A (en) 1997-03-27
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AU702865B2 (en) 1999-03-11
IL123486D0 (en) 1998-09-24
IL123486A (en) 2000-10-31
EA000619B1 (en) 1999-12-29
BR9610553A (en) 1999-12-21
AT177579T (en) 1999-03-15
TR199800362T1 (en) 1998-05-21
CZ58598A3 (en) 1998-08-12
EP0847670B1 (en) 1999-03-10
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HU9901396A3 (en) 2002-02-28
WO1997009853A2 (en) 1997-03-13
ES2130845T3 (en) 1999-07-01
DK847670T3 (en)
EA199800260A1 (en) 1998-08-27
JPH11512245A (en) 1999-10-19
DE69601729T2 (en) 1999-09-16
HU9901396A2 (en) 1999-08-30
CA2234944A1 (en) 1997-03-13
CN1195461A (en) 1998-10-07
WO1997009853A3 (en) 1997-04-03
DK0847670T3 (en) 1999-09-27
HK1008646A1 (en) 2000-03-24

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