WO2008050123A1 - Haut-parleurs - Google Patents

Haut-parleurs Download PDF

Info

Publication number
WO2008050123A1
WO2008050123A1 PCT/GB2007/004067 GB2007004067W WO2008050123A1 WO 2008050123 A1 WO2008050123 A1 WO 2008050123A1 GB 2007004067 W GB2007004067 W GB 2007004067W WO 2008050123 A1 WO2008050123 A1 WO 2008050123A1
Authority
WO
WIPO (PCT)
Prior art keywords
loudspeaker
diaphragms
diaphragm
sound
directing
Prior art date
Application number
PCT/GB2007/004067
Other languages
English (en)
Inventor
Gary Paul Nicholson
Original Assignee
Gary Paul Nicholson
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
Application filed by Gary Paul Nicholson filed Critical Gary Paul Nicholson
Publication of WO2008050123A1 publication Critical patent/WO2008050123A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/34—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
    • H04R1/345—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means for loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/40—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
    • H04R1/403—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers loud-speakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12—Non-planar diaphragms or cones
    • H04R7/14—Non-planar diaphragms or cones corrugated, pleated or ribbed
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/30—Combinations of transducers with horns, e.g. with mechanical matching means, i.e. front-loaded horns

Definitions

  • Embodiments of the present invention relate to loudspeakers.
  • they relate to piezo-electric loudspeakers with improved dispersion and frequency response characteristics.
  • Loudspeakers such as piezo-electric loudspeakers
  • horn-loaded loudspeaker assemblies for public address and live music.
  • the range of frequencies reproduced by this kind of speaker is around 2kHz upwards.
  • the quality of audio signal reproduction from such loudspeakers is limited, and the dispersion of the high-frequency sound is not as wide as would be desired.
  • a front or front-facing part means a part positioned generally on the part of a loudspeaker facing towards a listener
  • reference to a rear or rear-facing part means a part positioned generally facing away from a listener.
  • a loudspeaker comprising: one or more actuators; one or more diaphragms; the one or more actuators being coupled to the one or more diaphragms and the one or more diaphragms being arranged with a plurality of sound-radiating zones; and one or more front-facing sound-directing parts arranged to provide at least one compression and expansion region for at least one of the sound- radiating zones of the one or more diaphragms.
  • At least one of the one or more front facing sound-directing parts may comprise a relatively curved portion which is configured to provide constructive and/or destructive interference at predetermined frequencies.
  • At least a part of the one or more diaphragms and a part of the one or more front-facing sound-directing parts may define a first aperture which is arranged to output relatively low frequency sound waves.
  • the part of the one or more diaphragms which defines the first aperture may be relatively flexible.
  • At least a part of the one or more diaphragms and a part of the one or more front-facing sound-directing parts may define a second aperture which is arranged to output relatively high frequency sound waves.
  • the part of the one or more diaphragms which defines the second aperture may be relatively rigid.
  • the one or more diaphragms may be substantially planar.
  • At least one of the one or more diaphragms may be substantially corrugated.
  • At least one of the one or more diaphragms may have corrugations with parts substantially inclined to a plane or planes perpendicular to the primary axis or axes of the loudspeaker.
  • At least one of the one or more diaphragms may have corrugations with parts substantially not inclined to a plane or planes perpendicular to the primary axis or axes of the loudspeaker, and with parts substantially inclined to said plane or planes.
  • At least one of the one or more actuators may be coupled to at least one said inclined part of at least one said corrugation in at least one said diaphragm.
  • At least one of the one or more actuators may be coupled to at least one said not inclined part of at least one said corrugation in at least one said diaphragm.
  • At least one of the one or more actuators may be encapsulated in at least part of at least one said diaphragm.
  • At least a second diaphragm may provide a substantially enclosed volume with at least a first diaphragm, said at least first and second diaphragms being arranged to operate substantially in phase with each other.
  • At least a second diaphragm may provide a substantially enclosed volume with at least a first diaphragm, said at least first and second diaphragms being adapted to operate substantially out of phase with each other
  • the at least second diaphragm may be coupled to at least one of the one or more actuators which is also coupled to said at least first diaphragm.
  • the at least second diaphragm may be coupled to at least one of the one or more actuators which is not coupled to said at least first diaphragm.
  • At least one said front-facing sound-directing part may be coupled in at least one location to at least one said diaphragm.
  • At least one said front-facing sound-directing part may be coupled in at least one location to at least one of the one or more actuators.
  • the loudspeaker may further comprise one or more rear enclosing parts. At least one of the one or more rear enclosing parts may be coupled in at least one location to at least one of the one or more diaphragms.
  • At least one of the one or more rear enclosing parts may be coupled in at least one location to at least one of the one or more actuators.
  • At least one said rear enclosing part may be adapted to provide an acoustic path for sound waves emanating from the rear of at least one said diaphragm.
  • the one or more actuators may comprise piezo-electric actuators.
  • At least one said front-facing sound-directing part may have compression and expansion regions formed by a regular or irregular array of holes of uniform or non-uniform cross-section.
  • At least one said front-facing sound-directing part may have compression and expansion regions formed by a regular or irregular array of holes of uniform or non-uniform cross-section, and each of a length that allows the array as a whole to follow the contours of the one or more diaphragms.
  • At least one said front-facing sound-directing part may be adapted to provide an acoustic path for sound waves emanating from the rear of at least one of the one or more diaphragms.
  • At least one of the one or more diaphragms may be generally of circular, elliptical, or oval shape when viewed along the primary axis of the loudspeaker.
  • At least one of the one or more diaphragms may be generally of square, rectangular, hexagonal, triangular, or other polygonal shape when viewed along the primary axis of the loudspeaker, the sides of said polygonal shape being straight or curved. At least one of the one or more diaphragms may comprise a single piece of material.
  • At least one of the one or more diaphragms may comprise multiple pieces of similar or dissimilar materials.
  • At least one of the one or more front-facing sound-directing parts may comprise single pieces of material.
  • At least one of the one or more front-facing sound-directing parts may comprise multiple pieces of similar or dissimilar materials.
  • At least one of the one or more rear enclosing parts may comprise single pieces of material.
  • At least one of the one or more rear enclosing parts may comprise multiple pieces of similar or dissimilar materials.
  • an apparatus comprising a loudspeaker as described in any of the preceding paragraphs.
  • a loudspeaker comprising of at least one piezo-electric actuator, coupled to at least one diaphragm, said diaphragm or diaphragms being arranged with a plurality of sound-radiating zones, and at least one front-facing sound- directing part adapted to provide at least one compression and expansion region for at least one of the sound-radiating zones of said diaphragm or diaphragms, and at least one rear enclosing part.
  • One aspect of this invention is a piezo-electric loudspeaker characterized by having at least one piezo-electric actuator for audio frequency signals, coupled to at least one sound-radiating diaphragm with at least one corrugated zone, and at least one sound-directing front part with at least one compression region and at least one expansion region arranged to interact with the said corrugated zone(s) of the said diaphragm or diaphragms, wherein the totality of said compression and expansion region(s) is adapted to control sound pressure levels over several overlapping or discreet frequency ranges.
  • Another aspect of the invention is the provision of at least one sound-directing front part with multiple compression and expansion regions for the sound waves radiating from the front part of the said diaphragm or diaphragms, wherein each of said compression and expansion regions relates to at least one region of at least one said diaphragm.
  • the said compression and expansion regions are preferably adapted to compensate for phase shifts at the different frequencies.
  • the said compression and expansion regions are preferably adapted to minimize differences in sound pressure levels at the different frequencies.
  • the said compression and expansion regions are preferably adapted to provide an effective driver size small enough to prevent beaming of the sound waves at the particular frequencies associated with each region or regions.
  • Another aspect of the invention is the provision of at least one sound-directing rear part with multiple compression and expansion regions for the sound waves radiating from the rear part of the said diaphragm or diaphragms.
  • the said compression and expansion regions are preferably adapted to compensate for phase shifts at the different frequencies.
  • the said compression and expansion regions are preferably adapted to minimize differences in sound pressure levels at the different frequencies.
  • the said compression and expansion regions are preferably adapted to provide an effective driver size small enough to prevent beaming of the sound waves at the particular frequencies associated with each region or regions.
  • Another aspect of the invention is the provision of at least one sound-directing rear part with multiple compression and expansion regions for the sound waves radiating from the rear part of the said diaphragm or diaphragms, wherein each of said compression and expansion regions relates to at least one region of at least one said diaphragm.
  • the said sound-directing rear part(s) is (are) adapted to provide a path for low frequency sound waves, preferably below 200Hz.
  • the said sound-directing rear part(s) is (are) preferably adapted to provide a wave-guide, band-pass, transmission line, bass-reflex or similar arrangement.
  • the said compression and expansion regions are preferably adapted to minimize sound pressure levels at frequencies above the required frequency.
  • the said compression and expansion regions are preferably adapted to provide at least one exit for the said low frequency sound waves in or through at least one front part.
  • Another aspect of the invention is the provision of at least a second sound- radiating diaphragm, acting at an angle between 0 and 180 degrees to at least one first diaphragm(s).
  • the said at least second diaphragm(s) being preferably adapted to act in phase or out of phase with the said at least first diaphragm(s), and coupled to the same or different piezo-electric actuators as the said at least first diaphragm(s).
  • Another aspect of the invention is the provision of at least a second sound- radiating diaphragm, positioned to the rear of at least one first diaphragm(s).
  • the said at least second diaphragm(s) being preferably adapted to enclose a volume between the rear of the said at least first diaphragm and the rear of the said at least second diaphragm, and acting in phase or out of phase with the said at least first diaphragm.
  • Another aspect of the invention is the provision of at least one sound-directing front part with multiple compression and expansion regions for the sound waves radiating from the front part of the said diaphragm or diaphragms, wherein each of said compression and expansion regions relates to at least one region of at least one said diaphragm, and said sound-directing front part is adapted to be coupled to said diaphragm or diaphragms in at least one location on at least one diaphragm.
  • the said sound-directing front part may alternatively be coupled to at least one piezo-electric actuator, wherein said piezo-electric actuator may be coupled or not coupled to at least one said diaphragm or diaphragms. It is anticipated that said sound-directing front part(s) may be coupled to combinations of said diaphragm(s) and said piezoelectric actuator(s).
  • the said diaphragm or diaphragms may be manufactured from any suitable material, such as paper, plastics, cloth, metal, etc., and may be formed as one continuous piece of material or assembled from several pieces of similar or dissimilar materials.
  • the said sound-directing front part may be manufactured as one continuous piece of material, for example by injection moulding, or assembled from several pieces of similar or dissimilar materials.
  • the said sound-directing rear part may be manufactured as one continuous piece of material, for example by injection moulding, or assembled from several pieces of similar or dissimilar materials.
  • the said coupling means for the said piezo-electric actuator(s) may include bonding, mechanical fixing, chemical deposition, and partial or complete encapsulation within the said diaphragm.
  • Figure 1A illustrates a cross sectional side view of a loudspeaker according to one embodiment of the present invention
  • Figure 1 B illustrates a cross sectional side view of a loudspeaker according to another embodiment of the present invention
  • FIGS. 2a to 2d illustrate diagrams which show the effect of the diaphragm movement at different frequencies according to one embodiment of the present invention
  • Figure 3A illustrates a perspective view of a circular loudspeaker according to one embodiment of the invention
  • Fig. 3B illustrates a perspective view of an elliptical loudspeaker according to one embodiment of the invention
  • Figure 4 illustrates a perspective view of a plurality of loudspeakers according to embodiments of the present invention
  • Figure 5 illustrates a cross sectional side view of loudspeakers according to embodiments of the invention wherein multiple piezo-electric actuators are coupled to a single diaphragm;
  • Figure 6 illustrates a cross sectional side view of a loudspeaker according to one embodiment of the invention wherein multiple piezo-electric actuators are coupled to multiple diaphragms
  • Figure 7 illustrates a cross sectional side view of a loudspeaker according to one embodiment of the invention wherein multiple piezo-electric actuators are coupled to a single diaphragm
  • Figure 8 illustrates a cross sectional side view of a loudspeaker according to one embodiment of the invention wherein the piezo-electric actuators are coupled to inclined regions of a single diaphragm, and the sound-radiating front part is coupled to the diaphragm;
  • Figure 9 illustrates a cross sectional side view of a loudspeaker according to one embodiment of the invention wherein the piezo-electric actuators are coupled to both inclined and non-inclined regions of a single diaphragm, and the sound-radiating front part is coupled to the diaphragm;
  • Figure 10 illustrates a cross sectional side view of a loudspeaker according to one embodiment of the invention with compression and expansion regions formed in the front sound-directing part by an array of non-uniform cross- section holes, and the sound-radiating front part is coupled to the diaphragm;
  • Figure 11 illustrates a perspective, cut-away view of a loudspeaker according to one embodiment of the invention and wherein multiple piezo-electric actuators are coupled to a single diaphragm, a single sound-directing front part is coupled to the diaphragm, and a single rear enclosing part is provided;
  • Fig. 12 illustrates a schematic diagram of an apparatus including a loudspeaker according to embodiments of the present invention.
  • Figures 1A and 1 B illustrates a cross sectional side view of a loudspeaker 1 which includes at least one actuator 2, coupled by coupling means 3 to a diaphragm 4.
  • the diaphragm 4 may be substantially planar as illustrated in Fig. 1A or include corrugated portions as illustrated in Fig. 1 B.
  • the diaphragm 4 comprises multiple sound-radiating zones 5, 6, 7 for reproducing multiple frequency ranges.
  • the loudspeaker 1 also includes at least one sound-directing front part 8 with multiple compression regions 9, 10, 11 and expansion regions 12, 13, 14 which are arranged to work with the multiple sound-radiating zones 5, 6, 7 of the diaphragm 4.
  • the loudspeakers 1 illustrated in Fig. 1A and Fig. 1 B have an axis 21 and in these embodiments are substantially symmetrical about the axis 21.
  • the loudspeaker 1 may have any suitable shape and some examples are illustrated in Figs. 3 and 4.
  • the actuator 2 is a piezo-electric actuator.
  • the actuator may be any suitable actuator for moving the diaphragm and may include a motor for example.
  • the sound-directing front part 8, the compression regions 9, 10, 11 and expansion regions 12, 13, 14 are provided with means to position them relative to the diaphragm 4.
  • the sound-directing front part 8, the compression regions 9, 10, 11 and expansion regions 12, 13, 14 are formed as a single piece, for example by injection moulding. In other embodiments, the sound- directing front part 8, the compression regions 9, 10, 11 and expansion regions 12, 13, 14 may be formed from multiple pieces of similar or dissimilar materials.
  • the rear of the loudspeaker has a rear enclosing part 15, which may provide an acoustic path, and may have provision for electrical connections.
  • Coupling means 3 may include encapsulation (using resin for example) of the piezo- electric actuator(s) 2 within the diaphragm 4. Encapsulation may provide an advantage in that it may substantially water-proof the loudspeaker so that there are no exposed electrical contacts. This may allow the loudspeaker to be used under water.
  • the sound directing front part 8 may include curved portions which are configured to cause constructive interference of sound waves at predetermined frequencies when output from the loudspeaker 1 and/ or cause destructive interference of sound waves at other predetermined frequencies when output from the loudspeaker 1.
  • the effective working area of each of the sound-radiating zones 5, 6, 7 may be of different or similar size according to the desired acoustical characteristics and may overlap each other.
  • Figs. 2a and 2b are similar to Figs. 1 a and 1b and where the features are the same or similar, the same reference numerals are used.
  • the effect of different frequencies on the amplitudes of the displacements 20 of the multiple sound-radiating zones 5, 6, 7 is compared to the amplitude 19 at the location of the said attachment means 3 of the said piezo-electric actuator 2.
  • the parts 5 and 6 are more effective, and their pressure waves are emitted through aperture 16 in the sound-directing front part 8.
  • the parts 5 and 6 are relatively flexible (when compared with part 7 for example) which enables them to displace sufficient quantities of the working fluid (for example air) and the aperture 16 is relatively large. Consequently, this arrangement is suited to generating relatively low frequency audible sound waves.
  • part 7 is more effective and its pressure waves emit through aperture 17 in the sound-directing front part 8.
  • the part 7 is relatively rigid (when compared with parts 5 and 6 for example) and is therefore able to vibrate at sufficiently high enough frequencies.
  • the aperture 17 is relatively small and therefore reduces beaming (where high frequency sound waves may only be heard by a user in a small arc in front of the loudspeaker). Consequently, this arrangement is suited to generating relatively high frequency audible sound waves
  • the said diaphragm(s) 4 has (have) symmetry about at least one axis 18.
  • Figs. 2c and 2d are similar to Figs. 1a and 1b and where the features are the same or similar, the same reference numerals are used.
  • the effect of different frequencies on the amplitudes of the displacements 20 of the multiple sound-radiating zones 5, 6, 7 is compared to the amplitude 19 at the location of the said attachment means 3 of the said piezo-electric actuator 2.
  • the parts 5 and 6 are more effective, and their pressure waves are emitted through aperture 16 in the sound-directing front part 8.
  • FIG. 2c the parts 5 and 6 are more effective, and their pressure waves are emitted through aperture 16 in the sound-directing front part 8.
  • the said diaphragm(s) 4 has (have) symmetry about at least one axis 18.
  • Embodiments of the present invention provide an advantage in that they provide a loudspeaker which is operable in a wide range of frequencies and therefore produces high quality sound output.
  • the loudspeaker is operable at frequencies in the range of approximately 100 Hz to 20 kHz. Additionally, embodiments of the present invention do not substantially suffer from beaming due to the arrangement of the apertures defined by the front facing sound directing part 8.
  • FIG. 3 alternative embodiments are shown where the shape of the diaphragm 4 when viewed along the primary loudspeaker axis 21 is generally circular, oval, or elliptical.
  • Fig. 3A illustrates a perspective view of a circular loudspeaker 1
  • Fig. 3B illustrates a perspective view of an elliptical loudspeaker 1.
  • Figs. 5 to 10 illustrate cross sectional side views of loudspeakers according to various embodiments of the present invention. Where the features illustrated in Figs. 5 to 10 are the same/similar to the features illustrated in Fig. 1a and 1b, the same reference numerals are used.
  • FIG 6 an alternative embodiment is provided with multiple piezo-electric actuators 2, multiple diaphragms 4, and a single sound-directing front part(s) 8.
  • the embodiments illustrated in Figs. 5 and 6 may provide an advantage in that since the loudspeaker includes more than one piezo-electric actuator, the one or more diaphragms 4 may be controlled more accurately which thereby increases the sensitivity of the loudspeaker. Additionally, by having more than one piezoelectric actuator, the loudspeaker may have a louder sound output volume.
  • an alternative embodiment is provided with multiple piezo-electric actuators 2, a single diaphragm 4, and single or multiple sound-directing front part(s) 8, wherein the piezo-electric actuators are coupled at an angle to the diaphragm.
  • the piezoelectric actuators 2 may be considered to be at an angle to a line which is perpendicular to the axis 21 of the loudspeaker.
  • Fig. 7 provides an advantage in that since the actuators 2 are at an angle, the density of actuators in the loudspeaker 1 may be increased and the sensitivity and sound output volume may thereby also be increased. This arrangement may also reduce the depth of the loudspeaker since the actuators 2 require less space.
  • an alternative embodiment has multiple piezo-electric actuators 2, with single or multiple diaphragm(s) 4, and single or multiple sound-directing front part(s) 8.
  • the piezo-electric actuators 2 are coupled to the substantially inclined part(s) 27 of the diaphragm(s) 4, such that the bending of the diaphragm(s) 4 due to the action of the piezo-electric actuators causes pressure waves to be generated between adjacent substantially inclined part(s) 27 of the diaphragm(s) 4, or between substantially inclined part(s) 27 of the diaphragm(s) 4 and the sound-directing front part(s) 8, or combinations of both.
  • the front facing sound directing part 8 also includes a plurality of restraining members 25 which abut the diaphragm 4.
  • the restraining members 25 prevent the diaphragm and actuators 2 from substantially moving in the direction of the axis 21 of the loudspeaker 1.
  • the restraining members may thereby help to reduce noise in the sound output of the loudspeaker 1.
  • an alternative embodiment has multiple piezo-electric actuators 2, with single or multiple diaphragm(s) 4, and single or multiple sound-directing front part(s) 8.
  • the piezo-electric actuators 2 are coupled to the substantially inclined part(s) 27 and substantially non-inclined part(s) 22 of the diaphragm(s) 4, such that the bending of the diaphragm(s) 4 due to the action of the piezo-electric actuators causes pressure waves to be generated between adjacent substantially inclined and substantially non-inclined part(s) 27, 22 of the diaphragm(s) 4, or between substantially inclined and substantially non-inclined part(s) 27, 22 of the diaphragm(s) 4 and the sound- directing front part(s) 8, or combinations of both.
  • an alternative embodiment has multiple piezo-electric actuators 2, with single or multiple diaphragm(s) 4, and single or multiple sound-directing front part(s) 8.
  • the said compression and expansion regions in the sound-directing front part(s) 8 are formed by a regular or irregular array of holes, each of uniform or non-uniform cross-section, and each of a length that preferably allows the array as a whole to follow the contours of the said diaphragm(s) 4.
  • a typical assembly for one preferred embodiment has one diaphragm 4, with multiple piezo-electric actuators 2, a single sound-directing front part 8, and a single rear enclosing part 15 incorporating a single rear sound-directing part 23 and exit 24 in the sound-directing front part 8 incorporating a single rear sound-directing part 23 and exit 24 in the sound- directing front part 8.
  • Fig. 12 illustrates a schematic diagram of an apparatus including a loudspeaker 1 according to embodiments of the present invention.
  • the apparatus may be any device that has the ability to output audio and may be, for example, headphones, a loudspeaker arrangement for a Hi-Fi system, a mobile cellular telephone, Personal Computer (PC) audio speakers, a laptop personal computer, radio equipment or marine radio equipment.
  • the loudspeaker 1 is configured to receive electrical signals 28 from power amplification circuitry (not illustrated), which may or may not be part of the apparatus, and output sound waves.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Multimedia (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)

Abstract

L'invention concerne un haut-parleur comprenant : un ou plusieurs actionneurs ; un ou plusieurs diaphragmes ; le(s) actionneur(s) étant raccordé(s) au(x) diaphragme(s) et le(s) diaphragme(s) étant agencé(s) avec une pluralité de zones propagation du son ; et une ou plusieurs parties de direction du son se faisant face à l'avant agencées pour fournir au moins une région de compression et d'expansion pour au moins une des zones de propagation du son du ou des diaphragmes.
PCT/GB2007/004067 2006-10-25 2007-10-25 Haut-parleurs WO2008050123A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0621218.7 2006-10-25
GB0621218A GB2443228B (en) 2006-10-25 2006-10-25 Piezo-electric loudspeaker

Publications (1)

Publication Number Publication Date
WO2008050123A1 true WO2008050123A1 (fr) 2008-05-02

Family

ID=37545954

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2007/004067 WO2008050123A1 (fr) 2006-10-25 2007-10-25 Haut-parleurs

Country Status (2)

Country Link
GB (1) GB2443228B (fr)
WO (1) WO2008050123A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113365192A (zh) * 2020-03-06 2021-09-07 华为技术有限公司 压电扬声器和电子设备
WO2024066978A1 (fr) * 2022-09-30 2024-04-04 华为技术有限公司 Haut-parleur et dispositif électronique

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102959992B (zh) * 2010-07-23 2016-10-19 日本电气株式会社 振荡器和电子设备

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE358497A (fr) * 1925-01-09
FR2402375A1 (fr) * 1977-09-06 1979-03-30 Selmin Sas Procede et dispositifs pour le rayonnement omnidirectionnel d'ondes acoustiques
WO1984000460A1 (fr) * 1982-07-19 1984-02-02 Anthony Bernard Clarke Transducteur electromagnetique-acoustique
WO1988003744A1 (fr) * 1986-11-12 1988-05-19 Turbosound, Inc. Enceinte de renforcement du son utilisant un haut-parleur conique avec un organe de chargement annulaire central et un excitateur de compression monte coaxialement
DE19603002C1 (de) * 1996-01-27 1997-05-22 Martin Kling Lautsprecher mit einer Phasenkorrekturvorrichtung
US6137891A (en) * 1993-10-06 2000-10-24 Chain Reactions, Inc. Variable geometry electromagnetic transducer
WO2002025991A1 (fr) * 2000-09-22 2002-03-28 Robert Grunberg Couplage direct de guide d'ondes a un circuit d'attaque de compression dote d'embouchures formees de fentes d'adaptation
EP1333698A2 (fr) * 2002-01-31 2003-08-06 Martin Audio Limited Haut-parleur directionnel
EP1592281A2 (fr) * 2004-04-30 2005-11-02 Aura Audio Oy Un canal d'ondes planes, une construction de haut-parleur, un réseau linéaire de haut-parleurs et un procédé pour générer un front d'onde acoustique plan

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1159337A (en) * 1966-06-13 1969-07-23 Motorola Inc Piezoelectric Transducers
JPS59117900A (ja) * 1982-12-25 1984-07-07 Murata Mfg Co Ltd 圧電型スピ−カ
JPS61158300A (ja) * 1984-12-29 1986-07-17 Sony Corp 圧電スピ−カ
JP2000350279A (ja) * 1999-06-01 2000-12-15 Shinsei Kk ホーン形スピーカ
US6925187B2 (en) * 2000-03-28 2005-08-02 American Technology Corporation Horn array emitter

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE358497A (fr) * 1925-01-09
FR2402375A1 (fr) * 1977-09-06 1979-03-30 Selmin Sas Procede et dispositifs pour le rayonnement omnidirectionnel d'ondes acoustiques
WO1984000460A1 (fr) * 1982-07-19 1984-02-02 Anthony Bernard Clarke Transducteur electromagnetique-acoustique
WO1988003744A1 (fr) * 1986-11-12 1988-05-19 Turbosound, Inc. Enceinte de renforcement du son utilisant un haut-parleur conique avec un organe de chargement annulaire central et un excitateur de compression monte coaxialement
US6137891A (en) * 1993-10-06 2000-10-24 Chain Reactions, Inc. Variable geometry electromagnetic transducer
DE19603002C1 (de) * 1996-01-27 1997-05-22 Martin Kling Lautsprecher mit einer Phasenkorrekturvorrichtung
WO2002025991A1 (fr) * 2000-09-22 2002-03-28 Robert Grunberg Couplage direct de guide d'ondes a un circuit d'attaque de compression dote d'embouchures formees de fentes d'adaptation
EP1333698A2 (fr) * 2002-01-31 2003-08-06 Martin Audio Limited Haut-parleur directionnel
EP1592281A2 (fr) * 2004-04-30 2005-11-02 Aura Audio Oy Un canal d'ondes planes, une construction de haut-parleur, un réseau linéaire de haut-parleurs et un procédé pour générer un front d'onde acoustique plan

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113365192A (zh) * 2020-03-06 2021-09-07 华为技术有限公司 压电扬声器和电子设备
WO2024066978A1 (fr) * 2022-09-30 2024-04-04 华为技术有限公司 Haut-parleur et dispositif électronique

Also Published As

Publication number Publication date
GB0621218D0 (en) 2006-12-06
GB2443228B (en) 2010-02-10
GB2443228A (en) 2008-04-30

Similar Documents

Publication Publication Date Title
US6925187B2 (en) Horn array emitter
KR101587069B1 (ko) 전기 음향 변환 장치 및 전자 기기
US6804367B2 (en) Speaker apparatus and electronic apparatus having speaker apparatus enclosed therein
US9762994B2 (en) Active acoustic meta material loudspeaker system and the process to make the same
JP4948397B2 (ja) 閉ループ式埋込み型オーディオ伝送ライン技術
US20050195985A1 (en) Focused parametric array
JP5103873B2 (ja) 静電型超音波トランスデューサの駆動制御方法、静電型超音波トランスデューサ、これを用いた超音波スピーカ、音声信号再生方法、超指向性音響システム及び表示装置
US7747029B2 (en) Screen for playing audible signals by demodulating ultrasonic signals having the audible signals
US20170264998A1 (en) Acoustic diffusion generator
US20060233404A1 (en) Horn array emitter
JP2007503742A (ja) エミッタフィルムを有するパラメトリック・トランスデューサ
JP2007067514A (ja) スピーカー装置
WO2008050123A1 (fr) Haut-parleurs
WO2000028780A1 (fr) Haut-parleurs comprenant une source sonore de diffusion a phase non correlee
KR20060069520A (ko) 사운드 생성 트랜스듀서
US20170006379A1 (en) A Sound Diffusion System for Directional Sound Enhancement
WO2014054784A1 (fr) Dispositif audio et appareil électronique utilisant ce dispositif
JP2510607B2 (ja) 平面スピ−カ
US6870942B1 (en) Loudspeaker for line array sound system
KR100312000B1 (ko) 스피커
JP2004297752A (ja) スピーカシステム
KR200290895Y1 (ko) 이동통신 단말기용 입체음향 발생 유니트
JP6481480B2 (ja) 電気音響変換器
US5027411A (en) High frequency loudspeaker
US11758318B1 (en) Headphone and headset comprising the same

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 07824312

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 07824312

Country of ref document: EP

Kind code of ref document: A1