US1990409A - Acoustical diaphragm - Google Patents
Acoustical diaphragm Download PDFInfo
- Publication number
- US1990409A US1990409A US655844A US65584433A US1990409A US 1990409 A US1990409 A US 1990409A US 655844 A US655844 A US 655844A US 65584433 A US65584433 A US 65584433A US 1990409 A US1990409 A US 1990409A
- Authority
- US
- United States
- Prior art keywords
- diaphragm
- corrugations
- sectors
- acoustical
- sector
- 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 - Lifetime
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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
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/04—Plane diaphragms
- H04R7/06—Plane diaphragms comprising a plurality of sections or layers
Definitions
- ACOUSTICAL DIAPHRAGM Filed Feb. 8, 1933 000006 0 6 0 0 0 0060000000 v 6 o o [0 O O 00 O 8 o o o 9 F7 5.
- vwvrance Patented Feb. 5, 1935 1,999,499 ACOUSTICAL DIAPHRAGM Athol Ernest Neville Lawrance, Kenilworth, Africa Application February 8, 1933, Serial No. 655,844 In the Union of South Africa Februhry 19, 1932 Claims. (Cl. 181-92)
- the present invention relates to diaphragms for acoustical apparatus such as microphones. loud speakers, phonographs and musical instruments.
- the object of theinvention is to improve the sensitiveness of .the diaphragm to sound vibrations covering a wide range of frequency and thereby to enhance the clarity of the recorded or reproduced sound and ensure that it represents the original sound truly and without distortion, more particularly in the case of speech or music.
- successive sectors of the diaphragm are progressively stiffened so as to form a continuously progressive series occupying the circumferential extent of the diaphragm.
- the diaphragm is thus made selectively responsive to a series of sound wave lengths which themselves constitute a continuous and systematic progression.
- Figs. I to V are face views of different forms of-diaphragms.
- Fig. VIII is a cross section taken on line VIII VIII of Fig. I, I
- IX is a cross section taken on line IX-IX of Fig. 11,
- Fig. X is a cross section taken on line X-X of Fig. III.
- a diaphragm with sectors differing in stiffness
- the diaphragm may for instance be formed with corrugations which are different in different areas of the diaphragm.
- Fig. 1 shows a diaphragm 2 formed of a single sheet of material in which are formed a number of radialcorrugations 3.
- a sector such as that defined by the radii 5, 6, is stiffer than the sector defined by 8, '7 in which there are fewer corrugations but less stiff than the sector bounded by 4, 5, in which there are more corrugations.
- the stiffness is made to vary progressively around the diaphragm by progressively varying the pitch of the corrugations.
- Fig. II shows another form of corrugateddiago phragm in which the corrugations are equally pitched and the progressive variations of stiffness is effected by progressively varying the length of the corrugations.
- Fig. III' shows another corrugated diaphragm u in which the corrugations 3 are circumferential and of varying angular extent.
- stiffening of the sheet material forming the diaphragm is effected by'e numerous dots 8 thereon.
- this figure also shows a more definite stepping of the stiffness variation as compared with the substantially progressive variation indicated in the preceding figures.
- the area of the diaphragm is divided by imaginary diameters 9, 9, 10, 10 into the four sectors 11, 12, 13, 14.
- the dots 8 in all sectors being of the same diameter and depth, they are most in number and most closely spaced in sector 11 which is accordingly the stiifest sector.
- Sectors 12, 13, 14 in turn are provided with successively fewer and more widely spaced dots so that said sectors are successively less stiff.
- Figsl V, VI and VII show a diaphragm comprising a circumferentially complete single sheet 15. On this is cemented a second sheet 16 forming a sector of 2'70 degrees, then a third sheet 17 forming a sector of corrugations which are of uniform width and height and vary in aggregate length in equal sectors of the diaphragm so as to form a continuously progressive series embracing the whole circumferential extent of the diaphragm.
- An acoustical diaphragm successive sectors of which are made of varying stiffness by means of radial corrugations of uniform width and height, the pitch of said corrugations varying progressively so as to form a continuously progressive series embracing the whole circumferential extent of the diaphragm.
- An acoustical diaphragm successive sectors of which are made of varying stiffness by means of radial corrugations of uniform width and height, said corrugations progressively varying in length so as to form a continuously progressive series embracing the whole circumferential extent of the diaphragm.
- An acoustical diaphragm successive sectors of which are made of varying stiffness by means of circumferential corrugations of uniform width and height said corrugations diii'ering from one another in angular extent so as to form a continuously progressive series embracing the whole circumferential extent of the diaphragm.
Description
Feb. 5, 1935. A. E. N. LAWRANCE 1,990,409
ACOUSTICAL DIAPHRAGM Filed Feb. 8, 1933 000006 0 6 0 0 0 0060000000 v 6 o o [0 O O 00 O 8 o o o 9 F7 5. vwvrance Patented Feb. 5, 1935 1,999,499 ACOUSTICAL DIAPHRAGM Athol Ernest Neville Lawrance, Kenilworth, Johannesburg, Union of South Africa Application February 8, 1933, Serial No. 655,844 In the Union of South Africa Februhry 19, 1932 Claims. (Cl. 181-92) The present invention relates to diaphragms for acoustical apparatus such as microphones. loud speakers, phonographs and musical instruments.
l The object of theinvention is to improve the sensitiveness of .the diaphragm to sound vibrations covering a wide range of frequency and thereby to enhance the clarity of the recorded or reproduced sound and ensure that it represents the original sound truly and without distortion, more particularly in the case of speech or music.
According to the present invention, successive sectors of the diaphragm are progressively stiffened so as to form a continuously progressive series occupying the circumferential extent of the diaphragm.
The diaphragm is thus made selectively responsive to a series of sound wave lengths which themselves constitute a continuous and systematic progression.
The invention is illustrated in the accompanying drawing in which,
Figs. I to V are face views of different forms of-diaphragms.
Figs. VI and VII are cross sections of Fig. IV taken on VI-VI and VII-VII respectively.
Fig. VIII is a cross section taken on line VIII VIII of Fig. I, I
8. IX is a cross section taken on line IX-IX of Fig. 11,
Fig. X is a cross section taken on line X-X of Fig. III.
Various ways of making a diaphragm with sectors differing in stiffness are shown. The diaphragm may for instance be formed with corrugations which are different in different areas of the diaphragm. Fig. 1 shows a diaphragm 2 formed of a single sheet of material in which are formed a number of radialcorrugations 3.
These are spaced differently in diflerent areas of the diaphragm, so that a sector such as that defined by the radii 5, 6, is stiffer than the sector defined by 8, '7 in which there are fewer corrugations but less stiff than the sector bounded by 4, 5, in which there are more corrugations. Preferably the stiffness is made to vary progressively around the diaphragm by progressively varying the pitch of the corrugations. Fig. II shows another form of corrugateddiago phragm in which the corrugations are equally pitched and the progressive variations of stiffness is effected by progressively varying the length of the corrugations.
Fig. III'shows another corrugated diaphragm u in which the corrugations 3 are circumferential and of varying angular extent.
In the diaphragm shown in Fig. IV, stiffening of the sheet material forming the diaphragm is effected by'e numerous dots 8 thereon.
By way of example this figure also shows a more definite stepping of the stiffness variation as compared with the substantially progressive variation indicated in the preceding figures. The area of the diaphragm is divided by imaginary diameters 9, 9, 10, 10 into the four sectors 11, 12, 13, 14. The dots 8 in all sectors being of the same diameter and depth, they are most in number and most closely spaced in sector 11 which is accordingly the stiifest sector. Sectors 12, 13, 14 in turn are provided with successively fewer and more widely spaced dots so that said sectors are successively less stiff.
Another way in which the stifiness may be varied is by differentiating the thickness of the diaphragm in diiferent areas. Figsl V, VI and VII show a diaphragm comprising a circumferentially complete single sheet 15. On this is cemented a second sheet 16 forming a sector of 2'70 degrees, then a third sheet 17 forming a sector of corrugations which are of uniform width and height and vary in aggregate length in equal sectors of the diaphragm so as to form a continuously progressive series embracing the whole circumferential extent of the diaphragm.
3. An acoustical diaphragm successive sectors of which are made of varying stiffness by means of radial corrugations of uniform width and height, the pitch of said corrugations varying progressively so as to form a continuously progressive series embracing the whole circumferential extent of the diaphragm.
4. An acoustical diaphragm successive sectors of which are made of varying stiffness by means of radial corrugations of uniform width and height, said corrugations progressively varying in length so as to form a continuously progressive series embracing the whole circumferential extent of the diaphragm.
5. An acoustical diaphragm successive sectors of which are made of varying stiffness by means of circumferential corrugations of uniform width and height said corrugations diii'ering from one another in angular extent so as to form a continuously progressive series embracing the whole circumferential extent of the diaphragm.
ATHOL ERNEST NEVILLE LAWRANCE.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US655844A US1990409A (en) | 1932-02-19 | 1933-02-08 | Acoustical diaphragm |
GB4550/33A GB400825A (en) | 1932-02-19 | 1933-02-14 | Improvements in acoustical diaphragms |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US400825XA | 1932-02-19 | 1932-02-19 | |
US655844A US1990409A (en) | 1932-02-19 | 1933-02-08 | Acoustical diaphragm |
Publications (1)
Publication Number | Publication Date |
---|---|
US1990409A true US1990409A (en) | 1935-02-05 |
Family
ID=26716704
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US655844A Expired - Lifetime US1990409A (en) | 1932-02-19 | 1933-02-08 | Acoustical diaphragm |
Country Status (2)
Country | Link |
---|---|
US (1) | US1990409A (en) |
GB (1) | GB400825A (en) |
Cited By (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2815823A (en) * | 1953-03-02 | 1957-12-10 | Rca Corp | Loudspeaker structure |
US3464514A (en) * | 1966-04-06 | 1969-09-02 | Nippon Musical Instruments Mfg | Loudspeaker |
US3834486A (en) * | 1971-05-28 | 1974-09-10 | Matsushita Electric Ind Co Ltd | Vibration diaphragm and cone edge of a loudspeaker |
FR2400796A1 (en) * | 1977-08-18 | 1979-03-16 | Mallory & Co Inc P R | PIEZOELECTRIC TRANSDUCER AND METHOD FOR REDUCING THE RESONANCE FREQUENCY OF A TRANSDUCER |
US4581496A (en) * | 1979-09-04 | 1986-04-08 | Emhart Industries, Inc. | Diaphragm for attenuating harmonic response in an electroacoustic transducer |
US4727584A (en) * | 1986-02-14 | 1988-02-23 | Velodyne Acoustics, Inc. | Loudspeaker with motional feedback |
US4799264A (en) * | 1987-09-28 | 1989-01-17 | Plummer Jan P | Speaker system |
US20040003960A1 (en) * | 2002-06-24 | 2004-01-08 | Sawako Usuki | Loudspeaker diaphragm |
US20040007420A1 (en) * | 2002-07-12 | 2004-01-15 | Pioneer Corporation | Speaker and speaker diaphragm |
US20040129492A1 (en) * | 2002-10-28 | 2004-07-08 | Alejandro Bertagni | Planar diaphragm loudspeaker and related methods |
WO2006126149A1 (en) * | 2005-05-25 | 2006-11-30 | Nxp B.V. | Improved membrane for an electroacoustic transducer |
US20070047757A1 (en) * | 2005-08-26 | 2007-03-01 | Foxconn Technology Co., Ltd. | Diaphragm for micro-electroacoustic device |
US20070092101A1 (en) * | 2005-10-25 | 2007-04-26 | Mckenzie Mark D | Method and apparatus for controlling material vibration modes in polymer and paper high performance speaker diaphragms |
US20070209866A1 (en) * | 2004-04-29 | 2007-09-13 | Koninkljke Philips Electronics N.V. | Diaphragm for a Loudspeaker with a Moving Coil |
US20090038878A1 (en) * | 2007-08-10 | 2009-02-12 | Victor Company Of Japan, Limited | Acoustic diaphragm and speaker |
US20100183173A1 (en) * | 2007-01-31 | 2010-07-22 | Sennheiser Electronic GmbH & KG | Dynamic sound transducer and receiver |
US20120263337A1 (en) * | 2009-10-22 | 2012-10-18 | Sony Corporation | Speaker Diaphragm And Speaker Device |
US20160227314A1 (en) * | 2015-02-02 | 2016-08-04 | AAC Technologies Pte. Ltd. | Acoustic Device |
US9628917B2 (en) | 2014-07-23 | 2017-04-18 | Bose Corporation | Sound producing system |
USD819606S1 (en) * | 2015-11-26 | 2018-06-05 | Ricoh Company, Ltd. | Speaker with multiple diaphragms |
USD865719S1 (en) * | 2017-10-13 | 2019-11-05 | Alpine Electronics, Inc. | Speaker |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2732908A (en) * | 1951-12-05 | 1956-01-31 | brittain |
-
1933
- 1933-02-08 US US655844A patent/US1990409A/en not_active Expired - Lifetime
- 1933-02-14 GB GB4550/33A patent/GB400825A/en not_active Expired
Cited By (36)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2815823A (en) * | 1953-03-02 | 1957-12-10 | Rca Corp | Loudspeaker structure |
US3464514A (en) * | 1966-04-06 | 1969-09-02 | Nippon Musical Instruments Mfg | Loudspeaker |
US3834486A (en) * | 1971-05-28 | 1974-09-10 | Matsushita Electric Ind Co Ltd | Vibration diaphragm and cone edge of a loudspeaker |
FR2400796A1 (en) * | 1977-08-18 | 1979-03-16 | Mallory & Co Inc P R | PIEZOELECTRIC TRANSDUCER AND METHOD FOR REDUCING THE RESONANCE FREQUENCY OF A TRANSDUCER |
US4156156A (en) * | 1977-08-18 | 1979-05-22 | P. R. Mallory & Co. Inc. | Method for reducing the resonant frequency of a piezoelectric transducer |
US4581496A (en) * | 1979-09-04 | 1986-04-08 | Emhart Industries, Inc. | Diaphragm for attenuating harmonic response in an electroacoustic transducer |
US4727584A (en) * | 1986-02-14 | 1988-02-23 | Velodyne Acoustics, Inc. | Loudspeaker with motional feedback |
US4799264A (en) * | 1987-09-28 | 1989-01-17 | Plummer Jan P | Speaker system |
US20040003960A1 (en) * | 2002-06-24 | 2004-01-08 | Sawako Usuki | Loudspeaker diaphragm |
US6920957B2 (en) * | 2002-06-24 | 2005-07-26 | Matsushita Electric Industrial Co., Ltd. | Loudspeaker diaphragm |
US20040007420A1 (en) * | 2002-07-12 | 2004-01-15 | Pioneer Corporation | Speaker and speaker diaphragm |
US6957714B2 (en) * | 2002-07-12 | 2005-10-25 | Pioneer Corporation | Speaker and speaker diaphragm |
US20040129492A1 (en) * | 2002-10-28 | 2004-07-08 | Alejandro Bertagni | Planar diaphragm loudspeaker and related methods |
US6929091B2 (en) * | 2002-10-28 | 2005-08-16 | Sound Advance Systems, Inc. | Planar diaphragm loudspeaker and related methods |
US7416047B2 (en) * | 2004-04-29 | 2008-08-26 | Ewald Frasl | Diaphragm for a loudspeaker with a moving coil |
US20070209866A1 (en) * | 2004-04-29 | 2007-09-13 | Koninkljke Philips Electronics N.V. | Diaphragm for a Loudspeaker with a Moving Coil |
CN101180915B (en) * | 2005-05-25 | 2012-09-05 | 楼氏电子亚洲有限公司 | Improved membrane for an electroacoustic transducer |
WO2006126149A1 (en) * | 2005-05-25 | 2006-11-30 | Nxp B.V. | Improved membrane for an electroacoustic transducer |
US20080230304A1 (en) * | 2005-05-25 | 2008-09-25 | Nxp B.V. | Membrane for an Electroacoustic Transducer |
US7866439B2 (en) * | 2005-05-25 | 2011-01-11 | Nxp B.V. | Membrane for an electroacoustic transducer |
US20110019866A1 (en) * | 2005-05-25 | 2011-01-27 | Nxp B.V. | Membrane for an electroacoustic transducer |
US7946378B2 (en) | 2005-05-25 | 2011-05-24 | Nxp B.V. | Membrane for an electroacoustic transducer |
US20070047757A1 (en) * | 2005-08-26 | 2007-03-01 | Foxconn Technology Co., Ltd. | Diaphragm for micro-electroacoustic device |
US20070092101A1 (en) * | 2005-10-25 | 2007-04-26 | Mckenzie Mark D | Method and apparatus for controlling material vibration modes in polymer and paper high performance speaker diaphragms |
US8077903B2 (en) | 2005-10-25 | 2011-12-13 | Mckenzie Mark Douglas | Method and apparatus for controlling material vibration modes in polymer and paper high performance speaker diaphragms |
US20100183173A1 (en) * | 2007-01-31 | 2010-07-22 | Sennheiser Electronic GmbH & KG | Dynamic sound transducer and receiver |
US8731231B2 (en) * | 2007-01-31 | 2014-05-20 | Sennheiser Electronic Gmbh & Co. Kg | Dynamic sound transducer and receiver |
US20090038878A1 (en) * | 2007-08-10 | 2009-02-12 | Victor Company Of Japan, Limited | Acoustic diaphragm and speaker |
US7845461B2 (en) * | 2007-08-10 | 2010-12-07 | Victor Company Of Japan, Limited | Acoustic diaphragm and speaker |
US20120263337A1 (en) * | 2009-10-22 | 2012-10-18 | Sony Corporation | Speaker Diaphragm And Speaker Device |
US8750554B2 (en) * | 2009-10-22 | 2014-06-10 | Sony Corporation | Speaker diaphragm and speaker device |
US9628917B2 (en) | 2014-07-23 | 2017-04-18 | Bose Corporation | Sound producing system |
US20160227314A1 (en) * | 2015-02-02 | 2016-08-04 | AAC Technologies Pte. Ltd. | Acoustic Device |
US9510087B2 (en) * | 2015-02-02 | 2016-11-29 | AAC Technologies Pte. Ltd. | Acoustic device |
USD819606S1 (en) * | 2015-11-26 | 2018-06-05 | Ricoh Company, Ltd. | Speaker with multiple diaphragms |
USD865719S1 (en) * | 2017-10-13 | 2019-11-05 | Alpine Electronics, Inc. | Speaker |
Also Published As
Publication number | Publication date |
---|---|
GB400825A (en) | 1933-11-02 |
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