EP1819191A2 - Laminierter piezoelectrischer Wandler - Google Patents

Laminierter piezoelectrischer Wandler Download PDF

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Publication number
EP1819191A2
EP1819191A2 EP07109446A EP07109446A EP1819191A2 EP 1819191 A2 EP1819191 A2 EP 1819191A2 EP 07109446 A EP07109446 A EP 07109446A EP 07109446 A EP07109446 A EP 07109446A EP 1819191 A2 EP1819191 A2 EP 1819191A2
Authority
EP
European Patent Office
Prior art keywords
acoustic
transducer
active
assembly
rear housing
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
EP07109446A
Other languages
English (en)
French (fr)
Other versions
EP1819191A8 (de
EP1819191A3 (de
EP1819191B1 (de
Inventor
Jerry Peck
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Undersea Systems International Inc dba Ocean Tec
Original Assignee
UNDERSEA SYSTEMS INTERNATIONAL
Undersea Systems International Inc dba Ocean Technology Systems
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 UNDERSEA SYSTEMS INTERNATIONAL, Undersea Systems International Inc dba Ocean Technology Systems filed Critical UNDERSEA SYSTEMS INTERNATIONAL
Priority to DE602005023642T priority Critical patent/DE602005023642D1/de
Publication of EP1819191A2 publication Critical patent/EP1819191A2/de
Publication of EP1819191A3 publication Critical patent/EP1819191A3/de
Publication of EP1819191A8 publication Critical patent/EP1819191A8/de
Application granted granted Critical
Publication of EP1819191B1 publication Critical patent/EP1819191B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H04R1/44—Special adaptations for subaqueous use, e.g. for hydrophone
    • 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

Definitions

  • the invention relates to the field of underwater acoustic transducers for divers and in particular to a structure in which and a method by which such underwater acoustic transducers are tuned and manufactured.
  • Prior art, underwater acoustic transducers are typically encapsulated using potting compounds like silicone resin or urethane. This requires special potting equipment and facilities.
  • Other prior art diver's microphones use bladders filled with air to cover the microphone. The bladder collapses with depth, pressure compensating the microphone, but eventually stops compensation because the air in the bladder is compressed to a volume smaller than the microphone. When the air inside the bladder is compressed to this point, the microphone ceases to operate.
  • prior art underwater acoustic transducers being potted or fixed in design with an air bladder, have acoustical performances which are fixed by their designs and there is no ready means of tuning them to the specific acoustic characteristics of the facemask, helmet or other headgear with which they are combined and which can material alter their acoustic performance.
  • the invention is illustrated as an underwater acoustic transducer comprising an active acoustic element for transducing sound and electrical signals; a front and rear housing element disposed on each side of the active acoustic element to define a corresponding front and rear acoustic chamber on each side of the active acoustic element; and a rear cover disposed on the rear housing element to provide tuning of the corresponding rear acoustic chamber.
  • the active acoustic element comprises an electro-acoustic transducer laminated between to opposing waterproof layers, where the opposing waterproof layers comprise Lexan layers with an adhesive side in contact with the electro-acoustic transducer.
  • the electro-acoustic transducer comprises a piezoelectric element.
  • the front and rear housing elements each comprise an elastomeric washer defining an inner port.
  • the rear cover comprises an elastomeric washer defining an inner port.
  • the underwater acoustic transducer further comprises a stiffener disposed around the housing element and extending therefrom to permit free standing position of the acoustic transducer, which stiffener is a wire which encircles the front and rear housing elements and radially extends therefrom.
  • the rear cover has a port defined therethrough providing communication of external pressure to the active acoustic element.
  • the front and rear housing elements have corresponding ports defined therethrough providing communication of external pressure to the active acoustic element.
  • the underwater acoustic transducer comprises a laminated waterproof and sealed active acoustic element for transducing sound and electrical signals; a front and rear housing element disposed on each side of the active acoustic element to define a corresponding front and rear acoustic chamber on each side of the active acoustic element, each housing element defining a corresponding port therethrough of a predetermined diameter and thickness to provide tuning of the corresponding acoustic chamber and to provide free flooding acoustic chambers; and a rear cover disposed on the rear housing element and defining a corresponding port therethrough of a predetermined diameter and thickness to provide further tuning of the corresponding rear acoustic chamber while maintaining the free flooding characteristic of the rear acoustic chamber.
  • the invention is also characterized as a method of constructing an underwater acoustic transducer comprising the steps of laminating an active acoustic element for transducing sound and electrical signals between two waterproof layers, disposing a front and rear housing element on each side of the active acoustic element to define a corresponding front and rear tuned acoustic chamber on each side of the active acoustic element, and disposing a rear cover on the rear housing element to provide further tuning of the corresponding rear acoustic chamber.
  • the step of laminating the active acoustic element comprises adhering the waterproof layers with an adhesive side in contact with the electro-acoustic transducer.
  • the step of disposing the front and rear housing element on each side of the active acoustic element comprises affixing an elastomeric washer defining an inner port on each side of the active acoustic element to provide free flooding acoustic chambers.
  • the step of disposing a rear cover on the rear housing element comprises affixing an elastomeric washer defining an inner port on the rear housing element to further tune an rear acoustic chamber without interfering with the free flooding characteristic of the rear acoustic chamber.
  • Connection wires are coupled to the active acoustic element and the step of disposing the front and rear housing elements on each side of the active acoustic element comprises sealing the connection wires on the active acoustic element and within the front and rear housing elements.
  • the method further comprises the step of disposing a stiffener around the housing elements and extending therefrom to permit free standing position of the acoustic transducer.
  • the stiffener is disposed around the housing elements by encircling the front and rear housing elements with a wire which radially extends therefrom.
  • the method further comprises the step of mounting the underwater acoustic transducer within or on a facemask, helmet or headgear by attaching the stiffener to the facemask, helmet or headgear and bending the stiffener to operatively position the acoustic transducer.
  • the method comprises selecting a port diameter and/or thickness of the front and rear housing elements according to an empirically tuned acoustic performance of the underwater acoustic transducer in combination with the facemask, helmet or headgear in or on which the underwater acoustic transducer is mounted.
  • Fig.1 is an exploded perspective view of the supermic assembly of the invention.
  • Fig.2 is an exploded perspective view of the supermic assembly of Fig. 1 being assembled with the rubber washers used for acoustic tuning and mounting.
  • Fig. 3 is an assembled perspective view of the supermic assembly and rubber washers of Fig. 2 showing modification of the washers to accommodate the wires to the supermic assembly.
  • Fig. 4 is an assembled perspective view of the supermic assembly and rubber washers of Fig. 3 showing embedding of the wires to the supermic assembly and potting of their connection to the active element.
  • Fig. 5 is an exploded perspective view of the supermic assembly and rubber washers of Fig. 4 showing capping of the assembly with a disk cover.
  • Fig.6 is a perspective view of the rear side of the covered supermic assembly and rubber washers of Fig. 5 showing reinforcement of the assembly with nickel wire.
  • Fig. 7 is a top plan view of rear side the covered supermic assembly of Fig. 6.
  • Fig. 8 is a perspective view of the rear side of the completely assembled supermic assembly with the front side of the completely assembled supermic assembly being the opposing side and positioned downwardly out of view.
  • the invention is a transducer assembly 10 designed to be easily manufactured and to be water and pressure-proof.
  • This transducer assembly 10 can be used as an acoustic transducer for use as a diver's microphone, hydrophone or underwater speaker.
  • the transducer assembly 10 is easily manufactured by using laminated waterproof disks 12 as illustrated by the sequence of drawings of Figs. 1 - 8. As shown in the exploded view of Fig. 1 the active piezoelectric element 14 is sandwiched or laminated between two 0.005-inch Lexan® disks 12 having a waterproof self-adhering adhesive layer 16 on one side. Other plastics or materials of similar properties could be substitute for Lexan®, which is a trademark of General Electric Co.
  • piezoelectric element 14 may be substituted for other types of active elements.
  • Any acoustic-to-electric signal transducer now known or later devised may be employed.
  • piezoelectric element 14 could be arranged and configured according to well known principles to operate as an earphone or speaker, which is acoustically coupled to either air or water.
  • Notches 18 on the periphery of the disks 12 provide access or space for connecting wires 20 which are connected to active element 14. These notches 18 are subsequently sealed using a suitable urethane adhesive 22 as depicted in the perspective view of Fig. 4.
  • the assembly of elements 12, 14, 16, 20, collectively denoted in the perspective view of Fig. 2 by reference character 26 and termed supermic label, 26, is mounted in a rubber housing 24 comprised of rings resembling rubber washers in form. Two of the washers 24 are attached to the supermic label 26 using a suitable adhesive.
  • a suitable adhesive for example, a general-purpose urethane such as Kalex Tuff adhesive, which is a trademark of Hardman Inc. of Belleville, New Jersey, that exhibits excellent bonding to both polychloroprene rubber and Lexan® can be employed.
  • One or more additional washer-like disks (not shown) of any appropriate material, such as rubber, polyurethane, neoprene or the like, can be attached to the front, rear or both sides of washers 24 for acoustic tuning purposes.
  • the additional washers may have variable thicknesses and inner diameters according to the acoustic tuning needed, which is empirically determined for the specific design of the facemask in which assembly 10 is mounted using an acoustic frequency spectrum analyzer. The acoustic characteristics of each facemask design will differ from each other design.
  • the inner diameter of the two washers 24 may be identical or different depending on tuning as described below.
  • reference to a single washer 24 will be understood to mean to include one or collectively all of the washers 24 employed.
  • facemask is used, diving helmets, facemasks and all other diving headgear are understood to be within the scope of the invention.
  • a bead 32 of Kalex Tuff or other adhesive is applied to the peripheral edge of supermic label 26 as shown in Fig. 2.
  • Washers 24 are then pressed to the front and back of supermic label 26 with wires 20 lead through the inner diameter of the adjacent washer 24.
  • Two narrow cuts or grooves 34 are cut into the adjacent washer 24 to a depth to allow the full insertion of wires 20 therein as shown in Fig. 3, one wire 20 being placed into one corresponding groove 34.
  • Wires 20 are then laid into grooves 34 and notch 18 and at least the inner end of grooves 34 are potted or sealed with adhesive 22 as shown in Fig. 4.
  • a bead 36 of adhesive is laid down on the periphery of one of the washers 24, which is defined as the rear washer 24 with the opposing washer 24 being defined as the front washer 24, and a rear rubber washer 38 with an inner diameter through hole or port 40 is laid down on bead 36 as shown in Fig. 5. While a through hole or port 40 is preferred and illustrated, it is also within the scope of the invention that in some applications hole or port 40 may be a blind hole with a thin membranous bottom surface.
  • Rear washer 38 has an outer diameter greater than port 30 defined by the inner diameter of washers 24 and hence provides a perforated cover for one side of transducer assembly 10.
  • the opposing front side of transducer assembly 10 is preferably left open, but in some applications may be provided with a perforated cover or completely covered by a membranous or porous surface as may be desired in the specific application.
  • Wires 20 are twisted together as a pair to minimize stray pickup and nickel wire 28 or other stiffener is laid parallel to wires 20 and around washers 24 in the interlying space between washers 24, which is defined by providing a slightly larger outer diameter for washers 24 than for supermic label 26.
  • Nickel wire 28 thus forms an enclosing reinforcement completely around supermic label 26 and washers 24 and is led away from assembly 10 parallel to wires 20 for a predetermined length as shown in Fig. 6.
  • the arrangement is also illustrated in the top plan view of Fig. 7. Wires 28 thus allow assembly 10 to be positioned in the facemask by bending wires 28 as needed.
  • Transducer assembly 10 is then telescopically disposed over wires 28 and wires 20 as shown in Fig. 8 and heated air applied to shrink tubing 42 tightly onto wires 20 and 28.
  • Transducer assembly 10 is thus complete and is ready for mounting in a conventional manner in or on a facemask, which is accomplished by attaching wires 28 is a mounting bracket or other mechanical attachment means and bending wires 28 to position the front surface of transducer assembly 10 in a free standing position within the facemask near or just lightly touching the diver's lips.
  • wires 28 are mechanically attached to the facemask or its straps, and wires 28 bent to position the front surface of transducer assembly 10 in a position near or just inside the diver's ear.
  • this transducer assembly 10 is the particular ease by which it can be acoustically tuned, This is an important advantage. For instance, in a diver's full-face mask, there are other acoustic properties that affect the acoustic response of any microphone mounted on or in the mask. By adjusting the port size 30 or inner diameter of washer 24, the resulting installed microphone can be configured to exhibit a response that suppresses the muffled effect that is a result of the mask's acoustic Helmholtz effect. Usually the acoustic Helmholtz effect causes a rising response of the microphone as the frequencies moves toward 0 Hz or DC levels.
  • the transducer assembly 10 when used as a microphone is "ported" or constructed with washers 24 of selected thicknesses and inner diameters 30 as shown in Figs. 1-8 such that its acoustic response is exactly opposite than that of the facemask cavity. Because all facemasks are not the same, there is a need to adjust the microphone acoustic response in a way that suppresses the mask's acoustic peaks and valleys. If a greater rising frequency response in needed, additional porting can be applied to the front of the transducer assembly 10.
  • Nickel wire 28 is used in transducer assembly 10 as a means of reinforcement and to allow positioning of transducer assembly 10. It is both noncorrosive as well as flexible allowing the user to position the transducer assembly 10 if used as a microphone close to the diver's lips when employed as a microphone or ear(s) when employed as an earpiece.
  • transducer assembly 10 When used as a microphone, transducer assembly 10 exhibits a high degree of noise cancellation because of its gradient characteristics.
  • the degree of cancellation is controlled by the dimensions of the port 30 defined by the inner diameter of washers 24 applied to the front, rear or both (if used) of supermic label 26. If the acoustic path to supermic label 26 is made to be longer in the back of supermic label 26 than the front, because the rear port 30 has an added length, acoustic energy close the front of supermic label 26 will tend to produce a large electrical signal. However, if this energy comes from a greater distance, then the signal tends to cancel out. This is a conventional method by which noise canceling microphones operate.
  • the diameter of port 30 of the front and rear washers need not be identical. Typically, the diameter of port 40 is less than that of port 30. Stepped acoustic tuning may be achieved, for example, by providing a series of rear washers 24 with decreasing diameters of port 30. In addition rear or front washers 24 need not be restricted to a cylindrical shape as depicted in Figs. 1 - 8, but may instead have a conical inner surface or a surface with another shaped contour chosen according to the desired acoustic performance.
  • the laminated assembly process eliminates the need to completely encapsulate the front and rear of the element assembly. That in turn saves considerable manufacturing time and expense.
  • acoustic transducers were encapsulated using potting compounds like silicone resin or urethane. This requires special potting equipment and facilities. In the disclosed design the use of a small amount of urethane to cover the notch area where, the wires emerge from the piezoelectric element is preferred, but this requires is a small amount of labor compared to complete encapsulation.
  • a unique feature of the transducer assembly 10 of the invention is that it doesn't have any bladders or for that matter any air space whatsoever. Accordingly it can go to the bottom of the deepest ocean and function unaffected by depth and pressure.
  • assembly 10 Since assembly 10 is a transducer, it will also function as an underwater earphone or speaker if rear porting offers the correct acoustic resistance in water is employed.
  • Current speaker designs use air-backed elements that are subject to pressure effects and therefore have limited depth capability. The free flooding, self-cleaning, tunable and solid design of the invention does away with these problems.
  • Transducer assembly 10 can be used as both a waterproof and pressure proof microphone. Its simple design provides a simple means to manufacture a variety of divers' microphones and/or earphones. It solves the problems experienced by current designs where air backed or balloon devices are needed for pressure compensation.
  • Another advantage to this invention is the laminated structure that waterproofs the active piezoelectric element 14 without the need to encapsulate it.
  • the ported washer assembly may be designed as a single molded unit thereby eliminating the need to use a bead of urethane and saving considerable assembly time. If assembled in this way, only a small amount of urethane or suitable resin is needed to seal the electrical connections or any exposed un-insulated wires or connections.
  • a limitation to the molded rubber assembly is that unless additional molded ports are made as part of the design, acoustic tuning will be optimized for a particular mask or helmet.
  • the groove intended for the nickel wire is used in conjunction with a smaller opening in such a plastic structure whereby the thickness of the plastic comprising the periphery of the circular opening replaces the thickness of the nickel wire and is used to hold the transducer.
  • an underwater acoustic transducer comprising an active acoustic element for transducing sound and electrical signals; a front and rear housing element disposed on each side of the active acoustic element to define a corresponding front and rear acoustic chamber on each side of the active acoustic element; and a rear cover disposed on the rear housing element to provide tuning of the corresponding rear acoustic chamber.
  • the active acoustic element comprises an electro-acoustic transducer laminated between two opposing waterproof layers; the opposing waterproof layers preferably comprise Lexan layers with an adhesive side in contact with the electro-acoustic transducer; the electro-acoustic transducer preferably comprises a piezoelectric element.
  • the front and rear housing elements each comprise an elastomeric washer defining an inner port; the rear cover preferably comprises an elastomeric washer definer an inner port.
  • the transducer further comprises a stiffener disposed around the housing element and extending therefrom to permit free standing position of the acoustic transducer; the stiffener preferably comprises a wire which encircles the front and rear housing elements and radially extends therefrom.
  • the rear cover has a port defined therethrough providing communication of external pressure to the active acoustic element and where the front and rear housing elements have corresponding ports defined therethrough providing communication of external pressure to the active acoustic element.
  • a method of constructing an underwater acoustic transducer comprising laminating an active acoustic element for transducing sound and electrical signals between two waterproof layers; disposing a front and rear housing element on each side of the active acoustic element to define a corresponding front and rear tuned acoustic chamber on each side of the active acoustic element; and disposing a rear cover on the rear housing element to provide further tuning of the corresponding rear acoustic chamber.
  • laminating the active acoustic element comprises adhering the waterproof layers with an adhesive side in contact with the electro-acoustic transducer.
  • disposing the front and rear housing element on each side of the active acoustic element comprises affixing an elastomeric washer defining an inner port on each side of the active acoustic element to provide free flooding acoustic chambers.
  • disposing a rear cover on the rear housing element comprises affixing an elastomeric washer defining an inner port on the rear housing element to further tune a rear acoustic chamber without interfering with the free flooding characteristic of the rear acoustic chamber.
  • connection wires are coupled to the active acoustic element and disposing the front and rear housing elements on each side of the active acoustic element comprises sealing the connection wires on the active acoustic element and within the front and rear housing elements.
  • the method further comprises disposing a stiffener around the housing elements and extending therefrom to permit free standing position of the acoustic transducer.
  • disposing the stiffener around the housing elements comprises encircles the front and rear housing elements with a wire which radially extends therefrom.
  • the method further comprises mounting the underwater acoustic transducer within or on a facemask by attaching the stiffener to the facemask and bending the stiffener to operatively position the acoustic transducer.
  • the method further comprises mounting the underwater acoustic transducer in or on a facemask and where disposing the front and rear housing elements and disposing the rear cover on the rear housing element comprises selecting a port diameter and/or thickness of the front and rear housing elements according to an empirically tuned acoustic performance of the underwater acoustic transducer in combination with the facemask in or on which the underwater acoustic transducer is mounted.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Electrophonic Musical Instruments (AREA)
EP07109446A 2005-12-14 2005-12-14 Laminierter piezoelektrischer Wandler Not-in-force EP1819191B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE602005023642T DE602005023642D1 (de) 2005-12-14 2005-12-14 Laminierter piezoelektrischer Wandler

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05027342A EP1799009B1 (de) 2005-12-14 2005-12-14 Laminierter piezoelektrischer Wandler und Verfahren zur Herstellung desselben

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP05027342A Division EP1799009B1 (de) 2005-12-14 2005-12-14 Laminierter piezoelektrischer Wandler und Verfahren zur Herstellung desselben
EP05027342.4 Division 2005-12-14

Publications (4)

Publication Number Publication Date
EP1819191A2 true EP1819191A2 (de) 2007-08-15
EP1819191A3 EP1819191A3 (de) 2007-08-22
EP1819191A8 EP1819191A8 (de) 2007-10-24
EP1819191B1 EP1819191B1 (de) 2010-09-15

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ID=36406004

Family Applications (2)

Application Number Title Priority Date Filing Date
EP07109446A Not-in-force EP1819191B1 (de) 2005-12-14 2005-12-14 Laminierter piezoelektrischer Wandler
EP05027342A Not-in-force EP1799009B1 (de) 2005-12-14 2005-12-14 Laminierter piezoelektrischer Wandler und Verfahren zur Herstellung desselben

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP05027342A Not-in-force EP1799009B1 (de) 2005-12-14 2005-12-14 Laminierter piezoelektrischer Wandler und Verfahren zur Herstellung desselben

Country Status (4)

Country Link
EP (2) EP1819191B1 (de)
AT (2) ATE481824T1 (de)
DE (2) DE602005013257D1 (de)
ES (2) ES2349569T3 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008009284B4 (de) 2008-02-15 2009-10-22 Siemens Audiologische Technik Gmbh Wasserresistentes Hörgerät
CN117213616B (zh) * 2023-11-09 2024-01-26 中北大学 一种应力释放结构的压电水听器单元

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3909529A (en) * 1971-12-27 1975-09-30 Us Navy Immersible diver{3 s microphone
GB1546521A (en) * 1976-07-30 1979-05-23 France Armed Forces Electroacoustic transducer
US4454927A (en) * 1981-12-21 1984-06-19 Atlas Sound Division Of American Trading And Production Corp. Reentrant cone driven loudspeaker
EP0317167A1 (de) * 1987-11-19 1989-05-24 BRITISH TELECOMMUNICATIONS public limited company Schutzeinrichtung gegen Feuchtigkeit
US5117403A (en) * 1991-05-31 1992-05-26 Adolf Eberl Above and below water sound transducer
WO1995021512A1 (en) * 1994-02-03 1995-08-10 Knowles Electronics, Inc. Water submersible microphone
EP0669169A2 (de) * 1994-02-25 1995-08-30 Kureha Kagaku Kogyo Kabushiki Kaisha Wellenempfangender piezoelektrischer Anordnung
US5812496A (en) * 1997-10-20 1998-09-22 Peck/Pelissier Partnership Water resistant microphone
US6545948B1 (en) * 1999-12-06 2003-04-08 Gejing Jiang Submersible loudspeaker
US20030123692A1 (en) * 2001-02-26 2003-07-03 Masataka Ueki Speaker
US6693849B1 (en) * 2002-10-03 2004-02-17 Adolf Eberl Piezoelectric audio transducer
WO2005112503A1 (en) * 2004-05-07 2005-11-24 Diver Entertainment Sytsems, Inc. System for providing wireless waterproof audio

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3909529A (en) * 1971-12-27 1975-09-30 Us Navy Immersible diver{3 s microphone
GB1546521A (en) * 1976-07-30 1979-05-23 France Armed Forces Electroacoustic transducer
US4454927A (en) * 1981-12-21 1984-06-19 Atlas Sound Division Of American Trading And Production Corp. Reentrant cone driven loudspeaker
EP0317167A1 (de) * 1987-11-19 1989-05-24 BRITISH TELECOMMUNICATIONS public limited company Schutzeinrichtung gegen Feuchtigkeit
US5117403A (en) * 1991-05-31 1992-05-26 Adolf Eberl Above and below water sound transducer
WO1995021512A1 (en) * 1994-02-03 1995-08-10 Knowles Electronics, Inc. Water submersible microphone
EP0669169A2 (de) * 1994-02-25 1995-08-30 Kureha Kagaku Kogyo Kabushiki Kaisha Wellenempfangender piezoelektrischer Anordnung
US5812496A (en) * 1997-10-20 1998-09-22 Peck/Pelissier Partnership Water resistant microphone
US6545948B1 (en) * 1999-12-06 2003-04-08 Gejing Jiang Submersible loudspeaker
US20030123692A1 (en) * 2001-02-26 2003-07-03 Masataka Ueki Speaker
US6693849B1 (en) * 2002-10-03 2004-02-17 Adolf Eberl Piezoelectric audio transducer
WO2005112503A1 (en) * 2004-05-07 2005-11-24 Diver Entertainment Sytsems, Inc. System for providing wireless waterproof audio

Also Published As

Publication number Publication date
EP1799009A1 (de) 2007-06-20
EP1819191A8 (de) 2007-10-24
ATE481824T1 (de) 2010-10-15
ES2349569T3 (es) 2011-01-05
EP1819191A3 (de) 2007-08-22
EP1819191B1 (de) 2010-09-15
ES2320559T3 (es) 2009-05-25
EP1799009B1 (de) 2009-03-11
DE602005013257D1 (de) 2009-04-23
ATE425640T1 (de) 2009-03-15
DE602005023642D1 (de) 2010-10-28

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