CA1287394C - Multiple loudspeaker with piezoelectric "tweeter" supported in such away as to allow complete exploitation of the main loudspeaker diaphragm, the surface of which reflects the radiation emitted from the rear by the ceramic disk and by the piezoelectric "tweeter" diaphragm - Google Patents
Multiple loudspeaker with piezoelectric "tweeter" supported in such away as to allow complete exploitation of the main loudspeaker diaphragm, the surface of which reflects the radiation emitted from the rear by the ceramic disk and by the piezoelectric "tweeter" diaphragmInfo
- Publication number
- CA1287394C CA1287394C CA000513575A CA513575A CA1287394C CA 1287394 C CA1287394 C CA 1287394C CA 000513575 A CA000513575 A CA 000513575A CA 513575 A CA513575 A CA 513575A CA 1287394 C CA1287394 C CA 1287394C
- Authority
- CA
- Canada
- Prior art keywords
- diaphragm
- tweeter
- piezoelectric
- loudspeaker
- main
- 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.)
- Expired - Fee Related
Links
- 239000000919 ceramic Substances 0.000 title claims abstract description 19
- 230000005855 radiation Effects 0.000 title claims abstract description 14
- 230000004224 protection Effects 0.000 claims abstract description 8
- 210000000188 diaphragm Anatomy 0.000 abstract description 10
- 230000033458 reproduction Effects 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 241000937413 Axia Species 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/06—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
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/24—Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges
Abstract
ABSTRACT OF THE DISCLOSURE
Multiple loudspeaker with piezoelectric "tweeter" supported in such a way as to allow complete exploitation of the main loudspeaker diaphragm the surfaces of which reflects the ra-diation emitted from the rear by the ceramic disk and by the piezoelectric tweeter diaphragm.
This invention concerns a multiple loudspeaker with a piezo electric tweeter held up by a means of support which allows the rear wave emitted by the ceramic disk and re-spective conical diaphragm to be fully exploited, using the main loudspeaker cone as a reflecting surface without overloading the moving coil of the latter.
The invention is basically characterized by the fact that the piezoelectric tweeter is placed in front of the main loudspeaker cone without the traditional protection and support basket but using a different means of support which does not intercept or disturb the rear radiation from the piezoelectric "tweeter", or prevent the forward reflection of the radiation by the main loudspeaker dia-phragm.
Multiple loudspeaker with piezoelectric "tweeter" supported in such a way as to allow complete exploitation of the main loudspeaker diaphragm the surfaces of which reflects the ra-diation emitted from the rear by the ceramic disk and by the piezoelectric tweeter diaphragm.
This invention concerns a multiple loudspeaker with a piezo electric tweeter held up by a means of support which allows the rear wave emitted by the ceramic disk and re-spective conical diaphragm to be fully exploited, using the main loudspeaker cone as a reflecting surface without overloading the moving coil of the latter.
The invention is basically characterized by the fact that the piezoelectric tweeter is placed in front of the main loudspeaker cone without the traditional protection and support basket but using a different means of support which does not intercept or disturb the rear radiation from the piezoelectric "tweeter", or prevent the forward reflection of the radiation by the main loudspeaker dia-phragm.
Description
~2~739~
This patent application -for an industrial in~ention re-: fers to a mult1ple loudspeaker with a pie~oelectrie "twee-ter", held up by a means of support ~hich allows the rear wave e-mitted by the ceralnic disk and respective conical diaphragm to be fully exploited, usiny the main loudspeaker cone as a reflecting surface, without overloading the moving coil of the latter.
For further explanation of the loudspeaker, according to the invention, we -feel it is necessary to give a brief description of the currer1t technological situation in the field of acoustic reproducers.
In order to faithfully reproduce high frequencies, a 'loudspeaker should have a fairly small cone, while on the other hand, low frequency reproduction requires a cone of considerable dimensions; therefore when an optimuln perform-' ance needs to be obtained,instead of using just one loud-speaher intended to reproduce the whole range of audio-'frequencies with fidelity, an enselnble o-f several loud-speakers suitably arran~ed is usually adop~ed: some with large dimens~ons suitable for low fre~uency reproduct~on, normally called "woofers", bthers wi~h sma'll dimensions suitable for high frequency reproduction, normally called "tweeters".
The multiple loudspeakers' group includes bi-phonic coaxial loudspeakers which have t~lO reproduction appliances ., ~
, .
.
:~2~3~9~
This patent application -for an industrial in~ention re-: fers to a mult1ple loudspeaker with a pie~oelectrie "twee-ter", held up by a means of support ~hich allows the rear wave e-mitted by the ceralnic disk and respective conical diaphragm to be fully exploited, usiny the main loudspeaker cone as a reflecting surface, without overloading the moving coil of the latter.
For further explanation of the loudspeaker, according to the invention, we -feel it is necessary to give a brief description of the currer1t technological situation in the field of acoustic reproducers.
In order to faithfully reproduce high frequencies, a 'loudspeaker should have a fairly small cone, while on the other hand, low frequency reproduction requires a cone of considerable dimensions; therefore when an optimuln perform-' ance needs to be obtained,instead of using just one loud-speaher intended to reproduce the whole range of audio-'frequencies with fidelity, an enselnble o-f several loud-speakers suitably arran~ed is usually adop~ed: some with large dimens~ons suitable for low fre~uency reproduct~on, normally called "woofers", bthers wi~h sma'll dimensions suitable for high frequency reproduction, normally called "tweeters".
The multiple loudspeakers' group includes bi-phonic coaxial loudspeakers which have t~lO reproduction appliances ., ~
, .
.
:~2~3~9~
totally independent of each other but coaxially mollnted, one equipped with a bigger cone, the other equipped with a smaller cone placed imlllediately in front of and on the same axis as the bigger cone.
In some bi-phonic coaxial loudspeakers, a piezoelec-tric "tweeter" is adopted, namely using a ceramic ~isk ge-nerator of sound waves, situate~ inside a small protection and support baske.t, whicl) is a~tached to a part o-F the main loudspeal<er Frame (i.e. the bigger loduspeaker), according to various construction solutions: in some models the basket is supported by an axia'l pin, while in o-ther models a sup-port bracket is adopted made up of one or more radial spokes the end of which is to be positioned and fixed on the main loudspeaker basket.
Both construction solutions just described present some comlnorl problems and some specific problems.
For example the abovementiorled central support pin is not mechanically reliable; especially taking in-to account the econornic material used for its manufacture which is mainly p1astic barely resistant -to the ternperature, i-t can bend laterally until it -touches the main loudspeaker coil, which results in friction between -the parts which come into contact with each other and inllnediately causes an in-admissible crack'lin~ noise, iF not at the very worst, the hlockage oF the bigger cliaphragll1.
Moreover hoth suppor-t systems mentioned do not allow 30 the installation of the "twee-ter" completely inside the main loudspeaker diaphragm in such a way that the edges of the -two maxilTIum diameter sections of the two cones are actually ; coplanar. l'his is due to the overall dilnensions of the pro , ~ ' 7;~
In some bi-phonic coaxial loudspeakers, a piezoelec-tric "tweeter" is adopted, namely using a ceramic ~isk ge-nerator of sound waves, situate~ inside a small protection and support baske.t, whicl) is a~tached to a part o-F the main loudspeal<er Frame (i.e. the bigger loduspeaker), according to various construction solutions: in some models the basket is supported by an axia'l pin, while in o-ther models a sup-port bracket is adopted made up of one or more radial spokes the end of which is to be positioned and fixed on the main loudspeaker basket.
Both construction solutions just described present some comlnorl problems and some specific problems.
For example the abovementiorled central support pin is not mechanically reliable; especially taking in-to account the econornic material used for its manufacture which is mainly p1astic barely resistant -to the ternperature, i-t can bend laterally until it -touches the main loudspeaker coil, which results in friction between -the parts which come into contact with each other and inllnediately causes an in-admissible crack'lin~ noise, iF not at the very worst, the hlockage oF the bigger cliaphragll1.
Moreover hoth suppor-t systems mentioned do not allow 30 the installation of the "twee-ter" completely inside the main loudspeaker diaphragm in such a way that the edges of the -two maxilTIum diameter sections of the two cones are actually ; coplanar. l'his is due to the overall dilnensions of the pro , ~ ' 7;~
tection and support basket o~ tilt-~ piezoelectric "tweeter".
Ilowever the most serious probleln, which can occur in both systems examined so far, lies in -the -fact tha-t clue to the presence of the aforenlentioned support basket~ the sound waves emitted from the rear by the ceramic disk and by the conical diaphragm of tlle piezoelectric tweeter cannot be fully exploited. If these sound waves could be reflected forwards, the actual raciiation impedarlce of the sound sourcewould be increased.
UearincJ this in min(l, an alternative to the two above-mentioned solutions has already been proposed, whereby the support of the piezoelectric tweeter is in a coaxial posit-ion in front of the main louclspeaker cone.
According -to this alternative solution, the piezoelec-tric tweeter is not situated inside a basket, but its cera mic disk is fir1nly juined to the mobile suppor-t of the main 10udspeaker coil, the diaphrac~ of which can then act as a reflecting surface for tht! radiations emitted from the rear by the tweeter cone, but not for those radiations emit ted by the ceramic disk fixecl-to the rnobile support of the main loudspeaker coil.
In additlon to the limited exploitation of the waves emitted from the rear by the piezoelectric tweeter, the last solution indical:ed obviously brings about an overloading of the mobile support of the main loudsl)eaker coil. Even if 3U this ;s mir~ lal, an increase in the si~e of the magnet is nevertheless necessary, which leads to a notable increase in the final production cos-ts.
The ainl of this inven-tion is to provicle a means of support for the piezoelectric"tweeter", which, without over-' , ~z~
loading the Inobile supporl of i:he nlain lou(lspeaker coil, allows the exploitation o-F the radiation emitted from -the rear by the ceramic disk and that emitted by the cone. The dia-phragln behind -the main loudspeaker acts as a reflecting sur face, and furthermore the overall dilnensions o-F the piezo-electric~ltweeterllare limited in such a way that the whole of the latter can fi-t into the Inairl loudspeaker cone.
~ccording to this invention, the solution is based on the fact that the piezoelectriclltwee-terl~is placed in front of the mairl louclspeaker cone withollt the usual support and protection baske-t. A different Ineans of s~lpport is used instead, which does not intercept or clisturb radiation e-mitted fro!n the rear by -the piezoelectric"tweeter"or ob-struct the forward reflection oF said radiation by the mainloudspeaker diaphragm.
In accordance with a preferred embodi~ent of the in-vention, relating to the field of coaxial biphonic loud-speakers, the piezoelectric ~Itweeter~ wi-thout a basket, is suppor-ted by a spide~shaped bracket witll radial spokes, the ends of which are fixed to the Inain loudspeaker basket.
In accordance with an alternative e~bodiment of the invention, in the field o-f coaxia1 bi-phonic loudspeakers5 the piezoelectric"tweeter~lis Fixed on the back of the pro--tection grille which usually covers the hole on the front oF the panel on which the lolldspeaker is Inounted.
In order to provide Further explanation, the descript ; ion of this invention proceeds with re~erence to the en-closed drawings in which two preferred embodinlents of the invention at re~erence are schelnatically illustrated, to be applied in the field o~ bi-phonic, coaxial loudspeakers.
:
.
9~
Fig. 1 is a section witll the axial plan of a bi-phonic, coaxial loudspeaker, in accordance with -the invention and with its preferred embodiinent.
Fig. 2 is a section with an axial plan of a bi-phonic coaxial loudspeaker in accordance with the invention and with an alternative embodiment.
~ith reference to the abovementioned figures, the loud speaker at reFerence is made (Jp of two independent reproduc tion devices coaxially ll~ounte(l, an~ in conformity ~ith tra-ditional construction nletho(ls For bi-phonic coaxial loud-speakers.
The main moving-coii loudspeaker suitable for the re-: production of medium to low frequencies is made up of a bas ket (1), which suppor-ts the cone diaphragm (2) internally ~; and the centering device (3), which while allowing -the coil to move lonyitudinally, ensures that it is always perFec~y centered in the air gap and that it does not touch the two pole shoes; the external one being ring shaped (4) and the internal one cylindrical (5).
Number ($.) indicates an ant-i-dust plate which closes at the front -the mobile support sleeve (9) oF the coil, not shown in the figure.
With reference to Fig, 1, the other smaller piezoelec-tric loudspeaker suitable For high frequency reproduction~
30 is characterized by the fact that it is nlade up of the ce-ramic disk (10) and its respective cone ~11) only, which are held in a position coaxial to and in front o-f the dia-phragm (2) of the main louclspeaker, by means oF a support nracket (12) which in turn -is made up of a central annular .
~, . ~, ' , .
3L2a~73~3~
flange from which one or 1nore radial spokes branch out, le-vel with the flange, the encis of which are linket1 up with the main loudspeaker support baskel; (1).
More precisely, at the point where the diameter is greates-t, the cone (ll) of the piezoelectric"tweeter" is glued by its edge -to a spo)1~e ring (13), ac-ting as a damper, which in turn is glued onto the back of the afore1nentioned central annular flange.
~lith reference to fi~ure (2), according to an al-terna-tive embodimen-t o-f the invention, it can be noted how -the piezoelectric"twee-ter"is supported in a coaxial posi-tion in - front of the n~ain loudspeaker diapi)rag1l1 (2) by means of the protection grille (14), ~Ihich usually covers the hole on the front panel on which the loutdspea~er is mounted.
In this alternative version, th sponge ring 113), I:o which the edges of ~he piezoelectriC"t~Jeeter"COne (ll) are to be attached, is sluecl to a surface especially provided for the purpose, on the inside of the grille (14). Said grille, as per the example pu-t forward by the construction solution in Fig. 2, could even have a horn(l5) on the out side of the opening of which, the aforementioned sponge rintl (13) may he glued.
Needless to say l;his ciescription refers to the enclosetl drawings, reprocluceti For exi)lanatory purposes only, and re-lating to the Illanufacturt-! of bi-phonic, coaxial loudspeakers.
It is, however, obvious that the invention may be applied i1~ the iield of )~lultiple loucispeakers in general, not neces sarily bi-phonic and/or coax-ial, without actually deviating from ti~e concept of this invention and the protection affor-ded bv this industria1 patent ~i~ht.
:
Ilowever the most serious probleln, which can occur in both systems examined so far, lies in -the -fact tha-t clue to the presence of the aforenlentioned support basket~ the sound waves emitted from the rear by the ceramic disk and by the conical diaphragm of tlle piezoelectric tweeter cannot be fully exploited. If these sound waves could be reflected forwards, the actual raciiation impedarlce of the sound sourcewould be increased.
UearincJ this in min(l, an alternative to the two above-mentioned solutions has already been proposed, whereby the support of the piezoelectric tweeter is in a coaxial posit-ion in front of the main louclspeaker cone.
According -to this alternative solution, the piezoelec-tric tweeter is not situated inside a basket, but its cera mic disk is fir1nly juined to the mobile suppor-t of the main 10udspeaker coil, the diaphrac~ of which can then act as a reflecting surface for tht! radiations emitted from the rear by the tweeter cone, but not for those radiations emit ted by the ceramic disk fixecl-to the rnobile support of the main loudspeaker coil.
In additlon to the limited exploitation of the waves emitted from the rear by the piezoelectric tweeter, the last solution indical:ed obviously brings about an overloading of the mobile support of the main loudsl)eaker coil. Even if 3U this ;s mir~ lal, an increase in the si~e of the magnet is nevertheless necessary, which leads to a notable increase in the final production cos-ts.
The ainl of this inven-tion is to provicle a means of support for the piezoelectric"tweeter", which, without over-' , ~z~
loading the Inobile supporl of i:he nlain lou(lspeaker coil, allows the exploitation o-F the radiation emitted from -the rear by the ceramic disk and that emitted by the cone. The dia-phragln behind -the main loudspeaker acts as a reflecting sur face, and furthermore the overall dilnensions o-F the piezo-electric~ltweeterllare limited in such a way that the whole of the latter can fi-t into the Inairl loudspeaker cone.
~ccording to this invention, the solution is based on the fact that the piezoelectriclltwee-terl~is placed in front of the mairl louclspeaker cone withollt the usual support and protection baske-t. A different Ineans of s~lpport is used instead, which does not intercept or clisturb radiation e-mitted fro!n the rear by -the piezoelectric"tweeter"or ob-struct the forward reflection oF said radiation by the mainloudspeaker diaphragm.
In accordance with a preferred embodi~ent of the in-vention, relating to the field of coaxial biphonic loud-speakers, the piezoelectric ~Itweeter~ wi-thout a basket, is suppor-ted by a spide~shaped bracket witll radial spokes, the ends of which are fixed to the Inain loudspeaker basket.
In accordance with an alternative e~bodiment of the invention, in the field o-f coaxia1 bi-phonic loudspeakers5 the piezoelectric"tweeter~lis Fixed on the back of the pro--tection grille which usually covers the hole on the front oF the panel on which the lolldspeaker is Inounted.
In order to provide Further explanation, the descript ; ion of this invention proceeds with re~erence to the en-closed drawings in which two preferred embodinlents of the invention at re~erence are schelnatically illustrated, to be applied in the field o~ bi-phonic, coaxial loudspeakers.
:
.
9~
Fig. 1 is a section witll the axial plan of a bi-phonic, coaxial loudspeaker, in accordance with -the invention and with its preferred embodiinent.
Fig. 2 is a section with an axial plan of a bi-phonic coaxial loudspeaker in accordance with the invention and with an alternative embodiment.
~ith reference to the abovementioned figures, the loud speaker at reFerence is made (Jp of two independent reproduc tion devices coaxially ll~ounte(l, an~ in conformity ~ith tra-ditional construction nletho(ls For bi-phonic coaxial loud-speakers.
The main moving-coii loudspeaker suitable for the re-: production of medium to low frequencies is made up of a bas ket (1), which suppor-ts the cone diaphragm (2) internally ~; and the centering device (3), which while allowing -the coil to move lonyitudinally, ensures that it is always perFec~y centered in the air gap and that it does not touch the two pole shoes; the external one being ring shaped (4) and the internal one cylindrical (5).
Number ($.) indicates an ant-i-dust plate which closes at the front -the mobile support sleeve (9) oF the coil, not shown in the figure.
With reference to Fig, 1, the other smaller piezoelec-tric loudspeaker suitable For high frequency reproduction~
30 is characterized by the fact that it is nlade up of the ce-ramic disk (10) and its respective cone ~11) only, which are held in a position coaxial to and in front o-f the dia-phragm (2) of the main louclspeaker, by means oF a support nracket (12) which in turn -is made up of a central annular .
~, . ~, ' , .
3L2a~73~3~
flange from which one or 1nore radial spokes branch out, le-vel with the flange, the encis of which are linket1 up with the main loudspeaker support baskel; (1).
More precisely, at the point where the diameter is greates-t, the cone (ll) of the piezoelectric"tweeter" is glued by its edge -to a spo)1~e ring (13), ac-ting as a damper, which in turn is glued onto the back of the afore1nentioned central annular flange.
~lith reference to fi~ure (2), according to an al-terna-tive embodimen-t o-f the invention, it can be noted how -the piezoelectric"twee-ter"is supported in a coaxial posi-tion in - front of the n~ain loudspeaker diapi)rag1l1 (2) by means of the protection grille (14), ~Ihich usually covers the hole on the front panel on which the loutdspea~er is mounted.
In this alternative version, th sponge ring 113), I:o which the edges of ~he piezoelectriC"t~Jeeter"COne (ll) are to be attached, is sluecl to a surface especially provided for the purpose, on the inside of the grille (14). Said grille, as per the example pu-t forward by the construction solution in Fig. 2, could even have a horn(l5) on the out side of the opening of which, the aforementioned sponge rintl (13) may he glued.
Needless to say l;his ciescription refers to the enclosetl drawings, reprocluceti For exi)lanatory purposes only, and re-lating to the Illanufacturt-! of bi-phonic, coaxial loudspeakers.
It is, however, obvious that the invention may be applied i1~ the iield of )~lultiple loucispeakers in general, not neces sarily bi-phonic and/or coax-ial, without actually deviating from ti~e concept of this invention and the protection affor-ded bv this industria1 patent ~i~ht.
:
Claims (8)
1. Multiple loudspeaker with piezoelectric "tweeter" supported in such a way as to allow complete exploitation of the main loudspeaker diaphragm, the surface of which reflects the radiation emitted from the rear by the ceramic disk and by the piezoelectric "tweeter" diaphragm, characterized by the fact that the piezoelectric "tweeter" is made up of a ceramic disk and a diaphragm only and is held in position in front of the main loudspeaker diaphragm by means of a support bracket which in turn is made up of an annular flange, from which one or more spokes branch out towards the outside, the ends of which are to be fixed to the main loudspeaker basket.
2. Multiple loudspeaker, with piezoelectric "tweeter", supported in such a way as to allow complete exploitation of the main loudspeaker diaphragm, the surface of which reflects the radiation emitted from the rear by the ceramic disk and by the piezoelectric "tweeter" diaphragm, characterized by the fact that the piezoelectric tweeter is made up of a ceramic disk and a diaphragm only and according to an alternative version of the invention is held in position in front of the main loudspeaker diaphragm by means of a protection grille, which usually covers the hole on the front of the panel on which the loudspeaker is mounted.
3. A loudspeaker as claimed in claim 1, wherein, at the point where the diameter is at its greatest, the edge of the diaphragm is fixed on the inside to the aforementioned annular flange, where a sponge ring to act as a damper, has previously been applied.
4. A loudspeaker as claimed in claim 2, wherein at the point where the diameter is at its greatest, the edge of the cone is glued to a sponge ring which is in turn attached to a flange provided for this purpose on the inside of the grille.
5. Multiple loudspeaker with piezoelectric "tweeter" supported in such a way as to allow complete exploitation of the main loudspeaker diaphragm, the surface of which reflects the radiation emitted from the rear by the ceramic disk and by the piezoelectric "tweeter" diaphragm, characterized by the fact that the piezoelectric "tweeter" is made up of a ceramic disk and a diaphragm only and is held in position in front of the main loudspeaker diaphragm by means of a support bracket which in turn is made up of an annular flange, from which one or more spokes branch out towards the outside, the ends of which are to be fixed to the main loudspeaker basket and at the point where the diameter is at its greatest, the edge of the "tweeter" diaphragm is fixed on the inside to the aforementioned annular flange, where a sponge ring to act as a damper, has previously been applied.
6. Multiple loudspeaker, with piezoelectric "tweeter", supported in such a way as to allow complete exploitation of the main loudspeaker diaphragm, the surface of which reflects the radiation emitted from the rear by the ceramic disk and by the piezoelectric "tweeter" diaphragm, characterized by the fact that the piezoelectric tweeter is made up of a ceramic disk and a diaphragm only and according to an alternative version of the invention is held in position in front of the main loudspeaker diaphragm by means of a protection grille, which usually covers the hole on the front of the panel on which the loudspeaker is mounted the point where the diameter is at its greatest, the edge of the tweeter cone is glued to a sponge ring which is in turn attached to a flange provided for this purpose on the inside of the grille.
7. A multiple loudspeaker system having a piezoelectric tweeter supported in front of a main speaker diaphragm so as to allow complete exploitation of sound radiated from the piezoelectric drive disk and diaphragm, such that sound emitted from the rear of said tweeter diaphragm is reflected from the main speaker diaphragm and sound radiation emitted by the ceramic drive disk is reflected from the main speaker diaphragm, said tweeter being positioned in front of said main speaker diaphragm, whereby said forward directly radiated sound of said tweeter is reinforced with said reflected sound.
8. A multiple loudspeaker system for complete exploitation of radiated high frequency sound, said system comprising:
a main speaker, a high frequency piezoelectric tweeter, having a ceramic piezoelectric driver and a diaphragm, a support means for supporting said tweeter in front of said main speaker diaphragm, devoid of an obstruction between said tweeter and said main speaker diaphragm whereby sound emitted from the rear of said tweeter diaphragm is reflected from the main speaker diaphragm and sound radiation emitted by the ceramic driver is reflected from the main speaker diaphragm, whereby said forward directly radiated sound of said tweeter is reinforced with said reflected sound.
a main speaker, a high frequency piezoelectric tweeter, having a ceramic piezoelectric driver and a diaphragm, a support means for supporting said tweeter in front of said main speaker diaphragm, devoid of an obstruction between said tweeter and said main speaker diaphragm whereby sound emitted from the rear of said tweeter diaphragm is reflected from the main speaker diaphragm and sound radiation emitted by the ceramic driver is reflected from the main speaker diaphragm, whereby said forward directly radiated sound of said tweeter is reinforced with said reflected sound.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT00625/85A IT1187062B (en) | 1985-09-02 | 1985-09-02 | MULTIPLE SPEAKER, WITH PIEZOELECTRIC "TWEETER" SUPPORTED WITH MEANS THAT ALLOW THE EXPLOITATION OF THE MEMBRANE OF THE MAIN SPEAKER AS THE REFLECTIVE SURFACE OF THE RADIATION EMITTED REAR FROM THE CERAMIC DISC AND THE "TWE" MEMBRET |
| IT625A/85 | 1985-09-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1287394C true CA1287394C (en) | 1991-08-06 |
Family
ID=11293510
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000513575A Expired - Fee Related CA1287394C (en) | 1985-09-02 | 1986-07-11 | Multiple loudspeaker with piezoelectric "tweeter" supported in such away as to allow complete exploitation of the main loudspeaker diaphragm, the surface of which reflects the radiation emitted from the rear by the ceramic disk and by the piezoelectric "tweeter" diaphragm |
Country Status (11)
| Country | Link |
|---|---|
| EP (1) | EP0220354B1 (en) |
| JP (1) | JPH0738752B2 (en) |
| KR (1) | KR950002765B1 (en) |
| AT (1) | ATE65149T1 (en) |
| CA (1) | CA1287394C (en) |
| DE (1) | DE3583442D1 (en) |
| DK (1) | DK171190B1 (en) |
| ES (1) | ES8707839A1 (en) |
| FI (1) | FI86941C (en) |
| IT (1) | IT1187062B (en) |
| NO (1) | NO169930C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11627416B2 (en) | 2021-08-27 | 2023-04-11 | Apple Inc. | Two-way integrated speaker with piezoelectric diaphragm as tweeter |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3167153B2 (en) * | 1991-09-30 | 2001-05-21 | パイオニア株式会社 | Speaker spacer |
| GB9317345D0 (en) * | 1993-08-20 | 1993-10-06 | Centralforce Ltd | Loudspeaker |
| AUPS279202A0 (en) * | 2002-06-05 | 2002-06-27 | Sportzwhistle Pty Ltd | Transducer mounting |
| JP5392335B2 (en) * | 2011-10-12 | 2014-01-22 | 株式会社デンソー | Vehicle presence reporting device |
| KR101451687B1 (en) * | 2013-08-20 | 2014-10-22 | 임창수 | two way speaker having coaxial effect |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52145215A (en) * | 1976-05-28 | 1977-12-03 | Nippon Gakki Seizo Kk | Complex type speaker |
| JPS55154899A (en) * | 1979-05-22 | 1980-12-02 | Pioneer Electronic Corp | Compound loudspeaker |
| US4283606A (en) * | 1979-07-16 | 1981-08-11 | Cerwin Vega, Inc. | Coaxial loudspeaker system |
| JPS56112196A (en) * | 1980-02-08 | 1981-09-04 | Matsushita Electric Ind Co Ltd | Composite type speaker |
| JPS5753798U (en) * | 1980-09-11 | 1982-03-29 | ||
| JPS5912699A (en) * | 1982-07-13 | 1984-01-23 | Matsushita Electric Ind Co Ltd | Composite type speaker |
| US4475014A (en) * | 1982-09-13 | 1984-10-02 | Harman-Motive Inc. | Acoustical transducer |
| JPS5963592U (en) * | 1982-10-20 | 1984-04-26 | フォスタ−電機株式会社 | composite speaker |
-
1985
- 1985-09-02 IT IT00625/85A patent/IT1187062B/en active
- 1985-09-09 DE DE8585830227T patent/DE3583442D1/en not_active Expired - Fee Related
- 1985-09-09 AT AT85830227T patent/ATE65149T1/en not_active IP Right Cessation
- 1985-09-09 EP EP85830227A patent/EP0220354B1/en not_active Expired - Lifetime
-
1986
- 1986-05-29 DK DK251586A patent/DK171190B1/en not_active IP Right Cessation
- 1986-05-30 FI FI862323A patent/FI86941C/en not_active IP Right Cessation
- 1986-06-05 ES ES555745A patent/ES8707839A1/en not_active Expired
- 1986-06-12 KR KR1019860004662A patent/KR950002765B1/en not_active IP Right Cessation
- 1986-06-18 NO NO862429A patent/NO169930C/en not_active IP Right Cessation
- 1986-07-08 JP JP61158908A patent/JPH0738752B2/en not_active Expired - Lifetime
- 1986-07-11 CA CA000513575A patent/CA1287394C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11627416B2 (en) | 2021-08-27 | 2023-04-11 | Apple Inc. | Two-way integrated speaker with piezoelectric diaphragm as tweeter |
| US11956594B2 (en) | 2021-08-27 | 2024-04-09 | Apple Inc. | Two-way integrated speaker with piezoelectric diaphragm as tweeter |
Also Published As
| Publication number | Publication date |
|---|---|
| ATE65149T1 (en) | 1991-07-15 |
| DK251586D0 (en) | 1986-05-29 |
| DK251586A (en) | 1987-03-03 |
| FI86941C (en) | 1992-10-26 |
| EP0220354B1 (en) | 1991-07-10 |
| FI862323A (en) | 1987-03-03 |
| JPS6253590A (en) | 1987-03-09 |
| DE3583442D1 (en) | 1991-08-14 |
| IT8500625A0 (en) | 1985-09-02 |
| EP0220354A3 (en) | 1988-01-07 |
| JPH0738752B2 (en) | 1995-04-26 |
| NO862429L (en) | 1987-03-03 |
| NO169930B (en) | 1992-05-11 |
| DK171190B1 (en) | 1996-07-15 |
| ES8707839A1 (en) | 1987-09-01 |
| NO169930C (en) | 1992-08-19 |
| IT1187062B (en) | 1987-12-16 |
| ES555745A0 (en) | 1987-09-01 |
| EP0220354A2 (en) | 1987-05-06 |
| KR950002765B1 (en) | 1995-03-24 |
| KR870003670A (en) | 1987-04-18 |
| FI862323A0 (en) | 1986-05-30 |
| NO862429D0 (en) | 1986-06-18 |
| FI86941B (en) | 1992-07-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |