GB2358546A - A transparent piezoelectric loudspeaker - Google Patents

A transparent piezoelectric loudspeaker Download PDF

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Publication number
GB2358546A
GB2358546A GB0107749A GB0107749A GB2358546A GB 2358546 A GB2358546 A GB 2358546A GB 0107749 A GB0107749 A GB 0107749A GB 0107749 A GB0107749 A GB 0107749A GB 2358546 A GB2358546 A GB 2358546A
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GB
United Kingdom
Prior art keywords
piezoelectric
transparent
electrode
diaphragm
speaker
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
GB0107749A
Other versions
GB2358546B (en
GB0107749D0 (en
Inventor
Nozomi Toki
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.)
NEC Corp
Original Assignee
NEC Corp
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
Priority claimed from JP33841898A external-priority patent/JP3597061B2/en
Application filed by NEC Corp filed Critical NEC Corp
Publication of GB0107749D0 publication Critical patent/GB0107749D0/en
Publication of GB2358546A publication Critical patent/GB2358546A/en
Application granted granted Critical
Publication of GB2358546B publication Critical patent/GB2358546B/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
    • B06B1/0688—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction with foil-type piezoelectric elements, e.g. PVDF
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/03—Constructional features of telephone transmitters or receivers, e.g. telephone hand-sets
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/64—Constructional details of receivers, e.g. cabinets or dust covers
    • H04N5/642—Disposition of sound reproducers
    • 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

Abstract

The loudspeaker comprises one or two piezoelectric polymer films 5, 22, 23 and at least one transparent electrode pattern 4, 24 held between two frame members 12, 13. The loudspeaker may be used in front of image displays, the image being viewed through the loudspeaker (see fig 2). The loudspeaker may be used with mobile telephones and cathode ray tube (CRT) displays (see figs 1 and 5).

Description

2358546 PIEZOELECTRIC DIAPHRAGM AND PIEZOELECTRIC SPEAKER r7FT,n ap THr
TN34rNTInu This invention relates to a piezoelectric diaphragm and a 5 piezoelectric speaker to be used for a portable electronic device, such as a mobile communication terminal.
RACKaRorlun or THR TxVRNTTnN Conventiona,lly, receivers or speakers used in portable electronic devices are typically of dynamic type or piezoelectric type. In recent years. especially for mobile telephone terminals, a large- area L= (liquid crystal display) to display information such as image etc. has been desired increasingly.
with such enlargement of LCD area, a reduction in the area of a diaphragm for a receiver or speaker has been required. However, if the area of diaphragm is reduced to give a large-area LCD, the efficiency of electrical-acoustical conversion reduces and therefore the sound pressure reduces.
Japanese patent application laid-open No.4-70100 (1992) discloses a piezoelectric. transparent speakel that cdri ne made lighter and thinner than a dynamic type speaker and is provided with a transparent diaphragm, which can expand the range of use.
However, in case of a bimorph that piezoelectric ceramic for piezoelectric speaker is attached to both sides of a metallic diaphragm, the manufacturing cost increases since lead wires for electrode need to be led out from the two sides.
Also, in case of the transparent piezoelectric diaphragm that is attached to the front face of a display device such as a LCD etc. the manufacturing cost increases since lead wires for electrode also have to be formed with transparent conductive material.
SUMMARY OF THE TNVRNTTON
Accordingly, it is an object of the invention to providi piezoelectric diaphragm and a piezoelectric speaker that can 14pi a large installation area to a display device, such as LCD and display, in a portable electronic device.
It is a further object of the invention to provide a porta] electronic device that is equipped with a speaker and a display tli, can have a large installation area commonly.
According to the invention, a piezoelectric diaphraii comprises: a transparent piezoelectric member and a transparent electro4E According to another aspect of the invention, a piezoelect,i diaphragm, comprises:
a first transparent piezoelectric film; transparent electrode; and second transparent piezoelectric film; wherein the piezoelectric diaphragm has a lamination struct-l 1 in which the first transparent piezoelectric film, the transparon electrode and the second transparent piezoelectric film (1 laminated.
According to another aspect of the invention, a piezoelect:t,i speaker, comprises:
a piezoele ctric diaphragm which is composed of a transpar 11 piezoelectric member and a transparent electrode; a first frame which holds the fringe of the piezoelect:ii diaphragm on the side of transparent electrode; and a second frame which holds the fringe of the piezoelect:i diaphragm on the side of transparent piezoelectric member; wherein the first and second frames are installed so that ia image to be displayed by a display means is seen through transparent parts inside the first and second frames.
According to another aspect of the invention, a piezoelectric speaker, comprises:
a piezoelectric diaphragm which has a lamination structure in which a first transparent piezoelectric film, a transparent electrode and a second transparent piezoelectric film; a first frame which holds the fringe of the piezoelectric diaphragm on the side of the first transparent piezoelectric film of the piezoelectric diaphragm; and a second frame which holds the fringe of the piezoelectric diaphragm on the side of the second transparent piezoelectric film of the piezoelectric diaphragm; wherein the first and second frames are installed so that an image to be displayed by a display means is seen through transparent parts inside the first and second frames.
According to another aspect of the invention, a portable electronic device, comprises:
a display means to display an image; and a piezoelectric speaker composed of a transparent piezoeleLtr.Lc member and a transparent electrode; wherein the piezoelectric speaker is disposed in f ront of the display means.
PRTRP nRSCRTPTTON OP THR T)RAWTW9 The invention will be explained in more detail in conjunction with the appended drawings, wherein:
FIG. 1 is a front view showing a portable electronic device in which a piezoelectric speaker in a first preferred embodiment according to the invention is installed, FIG. 2 is a cross sec tional view showing the de tai led compos,. ion of a piezoelectric transparent speaker unit 26 in the m1 ile communication terminal 1 in FIG.1, FIG.3 is a broken perspective view showing the piezoeletri-. transparent speaker unit 26 in FIG.2, FIG.4 is a broken perspective view showing the det41lel composition of a piezoelectric diaphragm in a second pref,re embodiment according to the invention, and FIG.5 is an illustration showing an application of invention.
np-qrRTRTTn?l nP TRP PRRPRRRin RmpanTmpmTR A. First Embodiment A f irs t pref erred embodimen t of the invention i s explained b11 Ow 1.5 referring to FIG. 1. FIG. 1 is a front view showing a port:,l le electronic device to which a piezoelectric speaker according to, he invention is applied. This portable electronic device is a mol e communication terminal such as a portable telephone etc. In!the mobile communication terminal 1, a piezoelectric polymer acou#tc transducer is installed.
2 on the front surface of the mobile communication termin41 1 is a LCD tran. sparent member that is provided with an earpiece s!U ed hole 3.
A piezoelectric transparent speaker uni r- 2 6, which is descr. d later, is disposed behind the LCD transparent member 2, and eris sound from the earpiece sound hole 3.
FIG.2 isacross sectional view showing the detailed composit' n of the piezoelectric transparent speaker unit 26 built in the ab e mobile communication terminal 1. Also. FIG.3 is a broken perspectl e 30 view showing the piezoelectric transparent speaker unit 26.
Inside the mobile communication terminal 1, a LCD body (display means) 10 is fixed onto a print- circuit board 8 through a LCD holding mold 9.
A piezoelectric diaphragm 45 that is composed of a transparent electrode pattern (transparent electrode) 4 and a transparent piezoelectric material (transparent piezoelectric member) 5 is fixed onto (the front face of) the LCD body 10 through a diaphragm holding frame (first frame) 12, and is fixed facing to the LCD transparent member 2 of the mobile communication terminal 1 throgh a sealing frame (second frame) 13.
Thus. a back airspace 11 sealed by the diaphragm holding frame 12 is formed on the back side of the piezoelectric diaphragm 45, and a front airspace 6 sealed by the sealing frame 13 is formed on the front side of the piezoelectric diaphragm 45.
is A back sound hole 18 is'a hole to control the internal Pressure of the back airspace 11, and is formed between a groove formed on the diaphragm holding frame 12 and the LCD body 10 when the diaphragm holding frame 12 and the LCD body 10 contact each other.
The transparent electrode pattern 4 is formed on the transparent piezoelectric material 5, and an electric contact 15 is connected to the transparent electrode pattern 4. Also, an electric contact 16 is formed corresponding to the position of a cutout 19, thereby connected to the transparent piezoelectric material 5.
Meanwhile, a terminal 17 is provided to lead out the electric 25 contacts 15 and 16 to the outside.
Voltage applied to the terminal 17 is fed to the transparent electrode pattern 4 or the transparent piezoelectric material 5 through the electric contact 15 or 16, thereby a voltage difference occurs between the transparent electrode pattern 4 and the transparent piezoelectric material 5.
Hereupon, by the bending movement of the piezoelecit i diaphragm 45 composed of the transparent elecr-rode pattern 4 an:h transparenrpiezoelectric material 5, sound waves are emitted I the earpiece sound hole 3. 5 As the transparent piezoelectric material 5 in FIGS.2 an# for example, transparent piezoelectric ceramic or polymiic' piezoelectric film is used. The transparent electrode pattern 0 is of transparent conductive film such as ITO etc. When using polymeric piezoelectric film as the transpa,eri,t piezoelectric material 5, it is easier thinned than piezoe ecqrc ceramic and has a density lower than piezoelectric cera' Therefore, polymeric piezoelectric film is a material suitable jr weight saving and thinning.
Also, polymeric piezoelectric film does not have mechani, 11 brittleness as exhibited in ceramics, and therefore it has a mO -'e suitable diaphragm characteristic than ceramics.
In using transparent piezoelectric ceramic or polyme piezoelectric film as the transparent piezoelectric material 5,J first, tra nsparent conductive thin film such as ITO etc. is foreo 1 1.
thereon by vacuum deposition or sputtering, and then the transpar,J electrode pattern 4 is formed by photo etching etc.
B. Second Embodiment FIGA is a broken perspective view showing the detaile composition of a piezoelectric diaphragm in a second preferr embodiment according to the invention. In FIGA, like parts aj' indicated using like numerals in FIGS. 2 and 3, and their explanatio il are omitted herein.
In the second embodiment shown in FIG. 4, a transparent electro, pattern 24 is sandwiched between polymeric piezoelectric film 22 a polymeric piezoelectric film 23, r-hereby a bimorph-ty' piezoelectric diaphragm is configured.
in this embodiment, at first, the transparent electrode pattern 24 is formed on the polymeric piezoelectric film 22, and then, on the back side. the polymeric piezoelectric film 23 is attached.
Thereby, a bimorph piezoelectric diaphragm can be formed easily.
on the transparent par-tern electrode 24, a cutout 24a is formed by photo etching etc. Also, on corresponding part of the polymeric piezoelectric film 23, a cutout 23a is formed.
By pasting these polymeric piezoelectric films 22 and 23 together, the two films is contacted.
By pasting this bimorph piezoelectric film onto the diaphragm holding frame 12, the electric contact 15 is contacted with the polymeric piezoelectric film 22 and the electric contact 16 is contacted with the transparent electrode pattern 24 through the output 23a and the output 24a.
in this embodiment, the electric contact 15 is an electrode terminal for the polymeric piezoelectric films 22, 23, and the electric contact 16 is an electrode terminal for the transparent electrode pattern 24.
A's described above, in this embodiment, the piezoelectric diaphragm is composed of the polymeric piezoelectric films and the transparent electrode. Thus, the electrode is connected to the piezoelectric film opposite to the electrode terminal. Therefore, a bimorph piezoelectric diaphragm and electrode can be produced in large quantities.
Meanwhile, in the second embodiment, at first, transparent conductive film such as ITO etc. is formed on the polymeric piezoelectric film 22 by vacuum deposition or sputtering. Then, the transparent electrode pattern 24 is formed by photo etching.
Then, the polymeric piezoelectric film 23 is pasted onto the transparent -electrode side of the Polymeric piezoelectric film', thereby the bimorph-type piezoelectric diaphragm is formed.
Further, by adhering this piezoelectric diaphragm to the,j] holdingmold 9 (see FIG.2), a bimorph-type piezoelectric transpa speaker is formed.
when the piezoelectric transparent speaker thus forme installed between the LCD transparent member 2 and the LCD body'.l it operates as a speaker.
FIG. 5 is an illustration showing an application of the invent.
and is a broken perspective view showing the installation.
in the application in FIG.5, the piezoelectric transpa4 e speaker unit 26 described above is installed on the front sidqj a CRT display 25, which is used as a television set etc. Furtit for the purpose of protecting the piezoelectric diaphragmj protective screen 27 that is of a transparent material is instal on the front side of the piezoelectric transparent speaker. 1 By thus installing the piezoelectric transparent speaker on,l front side of a large-size display device such as a Braun tube:11 CRT (cathode-ray tube) display, the image can correspond to the so4 source.
other than this, this invention can be applied to the front s of any display device such as a plasma display, proj ector-type disp etc.
Advantages of the invention:
According to the invention, the transparent speaker is compo e of the transparent piezoelectric diaphragm formed with a zransparn piezoelectric material and a transparent electrode pattern by us vacuum etching or photo etching, and the frame to hold the friij of this piezoelectric diaphragm, Also. su.ch transparE piezoelectric diaphragm can be attached onto the front side of a LCD plate. Thereby, it can function as a speaker without blocking the displaying of LCD. Especially in portable communication terminals. the installation onto the space for LCD can prevent the installation area for speaker from increasing. Therefore, the portable communication terminals can be miniaturized and lightened by that much. Further, with a large area of diaphragm, high electricalacoustical conversion efficiency and a high productivicy, a piezoelectric diaphragm and a piezoelectric speaker can be provided.
In detail, the invention has advantages below.
By installing the speaker between the LCD body and the display screen, the installation area for speaker can' be prevented from increasing. Further, the number of components for speaker can be reduced by using some components for LCD commonly.. Thus, with a built-in LCD, a speaker for portable device can be miniaturized and lightened.
Also, since the display area of LCD is used commonly as the area of diaphragm. the area of diaphragm can be larger than that in the conventional speaker installed into small-size portable devices, and the electrical-acoustical conversion efficiency can be therefore enhanced. Further. since it is of piezoelectric type, its consumed power can be lowered comparing with the conventional dynamic-type speaker.
Since the image of LCD corresponds to the sound source o.f transparent piezoelectric speaker, it can lend natural communication and vision to a monitor for TV phone. TV set or VTR.
When using polymeric piezoelectric film, the transparent electrode pattern with the piezoelectric films on both sides can be mass-produced by vacuum deposition, photo etching. Thus. the bimorph piezoelectric diaphragm can be manufactured at a low cost.
Although the invention has been described with respEot to specific embodiment for complete and clear diSC10SUIO, the appended claims are not to be thus limited but ard to be construed as embodying all modification and alternadtiye constructions that may be occurred to one skilled in Ithe art which fairly fall within the basic teaching here is set f orth.
Each feature disclosed in this specification (wtih term includes the claims) and/or shown in the drawings gay be incorporated in the invention independently of ot jor disclosed and/or illustrated features.
Statements in this specification of the "objects'l)f the invention" or to its advantages relate to prefex d embodiments of the invention, but not necessarily to lall i is embodiments of the invention falling within the claimsl The description of the invention with reference to ltle drawings is by way of example only.
The text of the abstract filed herewith is repeis,q i d here as part of the specification.
Disclosed in a piezoelectric diaphragm withl a transparent piezoelectric member and a transpaX t electrode. Also disclosed is a portable electronic devi e that has a display means to display an image and a piezoelectric speaker having a transparent piezoeiecqrc member and a transparent electrode. In this porta e electronic device, the piezoelectric speaker is disposed in front of the display means.

Claims (7)

CLAIMS:
1. A piezoelectric speaker, comprising: a piezoelectric diaphragm which is composed of a transparent piezoelectric member and a transparent electrode; a first frame which holds the fringe of said piezoelectric diaphragm on the side of the transparent electrode; and, a second f rame which holds the f ringe of said piezoelectric diaphragm on the side of the transparent piezoelectric member; wherein said first and second frames are installed so that an image to be displayed by a display means is seen through transparent parts inside said first and second frames.
2. A piezoelectric speaker according to claim 1, wherein said transparent piezoelectric member and said transparent electrode composing said piezoelectric diaphragm each are patterned with a transparent pattern; and a terminal disposed on said first frame is provided with a first electrode electrically connected to said transparent electrode and a second electrode electrically connected to the tranparent piezoelectric member.
3. A piezoelectric speaker according to claim 2, wherein: said transparent electrode is provided with a cutout corresponding to said second electrode; and,. said second electrode is electrically connected to said transparent piezoelectric member through said cutout when said first frame is contacted with said piezoelectric diaphragm.
4. A piezoelectric speaker, comprising:
a piezoelectric diaphragm which has a lamination stru.-,,it 4re comprising a first transparent piezoelectric film, a transp'rnt. electrode and a second transparent piezoelectric film; a first frame which holds the fringe of said piezoelec,,i(' diaphragm on the side of said first transparent piezoelec,,,'ti(, film of said piezoelectric diaphragm; and, a second frame which holds the fringe of said piezoelec,lti(, diaphragm on the side of said second transparent piezoelec,,1,t:;ic, film of said piezoelectric diaphragm; wherein said first and second frames are installed so:,tlat.. an image to be displayed by a display means is seen hr,bigli 1 transparent parts inside said first and second frames.
5. A piezoelectric speaker according to claim 4, whex, n said f irst and second transparent piezoelectric J11 composing said piezoelectric diaphragm each are patterned,,wtli a transparent pattern; and a terminal disposed on said J. f rame is provided with a f irst electrode electrically connE: c 4e to said transparent electrode and a second electrode electrc?,lc.ally connected to the transparent piezoelectric member.
6. A piezoelectric speaker according to claim 5, whe?.ien said first transparent piezoelectric film is provided wt'41 1 a first cutout corresponding to the position of said soc>n(l electrode; said transparent electrode is provided with a second ct)u: corresponding to said second electrode; and, -13said second electrode is electrically connected to said transparent piezoelectric member through said first and second cutouts when said first frame is contacted with said piezoelectric diaphragm.
7.. A piezoelectric speaker substantially as herein described with reference to the accompanying drawings.
GB0107749A 1998-11-13 1999-11-12 Piezoelectric diaphragm and piezoelectric speaker Expired - Lifetime GB2358546B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP33841898A JP3597061B2 (en) 1998-11-13 1998-11-13 Piezo speaker
GB9926907A GB2343811A (en) 1998-11-13 1999-11-12 Transparent piezoelectric speaker in a display device

Publications (3)

Publication Number Publication Date
GB0107749D0 GB0107749D0 (en) 2001-05-16
GB2358546A true GB2358546A (en) 2001-07-25
GB2358546B GB2358546B (en) 2002-01-23

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GB0107749A Expired - Lifetime GB2358546B (en) 1998-11-13 1999-11-12 Piezoelectric diaphragm and piezoelectric speaker

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Cited By (16)

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WO2004004411A1 (en) * 2002-06-27 2004-01-08 Andromed Inc. Piezoelectric biological sound monitor with printed circuit board
US8523781B2 (en) 2009-10-15 2013-09-03 Masimo Corporation Bidirectional physiological information display
US9724016B1 (en) 2009-10-16 2017-08-08 Masimo Corp. Respiration processor
US9782110B2 (en) 2010-06-02 2017-10-10 Masimo Corporation Opticoustic sensor
US9795358B2 (en) 2008-12-30 2017-10-24 Masimo Corporation Acoustic sensor assembly
US9867578B2 (en) 2009-10-15 2018-01-16 Masimo Corporation Physiological acoustic monitoring system
US9877686B2 (en) 2009-10-15 2018-01-30 Masimo Corporation System for determining confidence in respiratory rate measurements
US9955937B2 (en) 2012-09-20 2018-05-01 Masimo Corporation Acoustic patient sensor coupler
US10098610B2 (en) 2009-10-15 2018-10-16 Masimo Corporation Physiological acoustic monitoring system
US10098550B2 (en) 2010-03-30 2018-10-16 Masimo Corporation Plethysmographic respiration rate detection
US10349895B2 (en) 2009-10-15 2019-07-16 Masimo Corporation Acoustic respiratory monitoring sensor having multiple sensing elements
US10441181B1 (en) 2013-03-13 2019-10-15 Masimo Corporation Acoustic pulse and respiration monitoring system
US10463340B2 (en) 2009-10-15 2019-11-05 Masimo Corporation Acoustic respiratory monitoring systems and methods
US10729402B2 (en) 2009-12-04 2020-08-04 Masimo Corporation Calibration for multi-stage physiological monitors
US10828007B1 (en) 2013-10-11 2020-11-10 Masimo Corporation Acoustic sensor with attachment portion
US11412964B2 (en) 2008-05-05 2022-08-16 Masimo Corporation Pulse oximetry system with electrical decoupling circuitry

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CA2464029A1 (en) 2004-04-08 2005-10-08 Valery Telfort Non-invasive ventilation monitor
US9106038B2 (en) 2009-10-15 2015-08-11 Masimo Corporation Pulse oximetry system with low noise cable hub
US9192351B1 (en) 2011-07-22 2015-11-24 Masimo Corporation Acoustic respiratory monitoring sensor with probe-off detection

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WO2004004411A1 (en) * 2002-06-27 2004-01-08 Andromed Inc. Piezoelectric biological sound monitor with printed circuit board
US11412964B2 (en) 2008-05-05 2022-08-16 Masimo Corporation Pulse oximetry system with electrical decoupling circuitry
US10548561B2 (en) 2008-12-30 2020-02-04 Masimo Corporation Acoustic sensor assembly
US9795358B2 (en) 2008-12-30 2017-10-24 Masimo Corporation Acoustic sensor assembly
US11559275B2 (en) 2008-12-30 2023-01-24 Masimo Corporation Acoustic sensor assembly
US9867578B2 (en) 2009-10-15 2018-01-16 Masimo Corporation Physiological acoustic monitoring system
US9668703B2 (en) 2009-10-15 2017-06-06 Masimo Corporation Bidirectional physiological information display
US8790268B2 (en) 2009-10-15 2014-07-29 Masimo Corporation Bidirectional physiological information display
US10463340B2 (en) 2009-10-15 2019-11-05 Masimo Corporation Acoustic respiratory monitoring systems and methods
US9877686B2 (en) 2009-10-15 2018-01-30 Masimo Corporation System for determining confidence in respiratory rate measurements
US10925544B2 (en) 2009-10-15 2021-02-23 Masimo Corporation Acoustic respiratory monitoring sensor having multiple sensing elements
US10098610B2 (en) 2009-10-15 2018-10-16 Masimo Corporation Physiological acoustic monitoring system
US10813598B2 (en) 2009-10-15 2020-10-27 Masimo Corporation System and method for monitoring respiratory rate measurements
US10349895B2 (en) 2009-10-15 2019-07-16 Masimo Corporation Acoustic respiratory monitoring sensor having multiple sensing elements
US10357209B2 (en) 2009-10-15 2019-07-23 Masimo Corporation Bidirectional physiological information display
US8523781B2 (en) 2009-10-15 2013-09-03 Masimo Corporation Bidirectional physiological information display
US9848800B1 (en) 2009-10-16 2017-12-26 Masimo Corporation Respiratory pause detector
US10595747B2 (en) 2009-10-16 2020-03-24 Masimo Corporation Respiration processor
US9724016B1 (en) 2009-10-16 2017-08-08 Masimo Corp. Respiration processor
US10729402B2 (en) 2009-12-04 2020-08-04 Masimo Corporation Calibration for multi-stage physiological monitors
US11571152B2 (en) 2009-12-04 2023-02-07 Masimo Corporation Calibration for multi-stage physiological monitors
US10098550B2 (en) 2010-03-30 2018-10-16 Masimo Corporation Plethysmographic respiration rate detection
US11399722B2 (en) 2010-03-30 2022-08-02 Masimo Corporation Plethysmographic respiration rate detection
US9782110B2 (en) 2010-06-02 2017-10-10 Masimo Corporation Opticoustic sensor
US9955937B2 (en) 2012-09-20 2018-05-01 Masimo Corporation Acoustic patient sensor coupler
US11020084B2 (en) 2012-09-20 2021-06-01 Masimo Corporation Acoustic patient sensor coupler
US10441181B1 (en) 2013-03-13 2019-10-15 Masimo Corporation Acoustic pulse and respiration monitoring system
US11963749B2 (en) 2013-03-13 2024-04-23 Masimo Corporation Acoustic physiological monitoring system
US10828007B1 (en) 2013-10-11 2020-11-10 Masimo Corporation Acoustic sensor with attachment portion

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Publication number Publication date
GB2358546B (en) 2002-01-23
GB0107749D0 (en) 2001-05-16

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Expiry date: 20191111