US3180945A - Loudspeaker - Google Patents

Loudspeaker Download PDF

Info

Publication number
US3180945A
US3180945A US139920A US13992061A US3180945A US 3180945 A US3180945 A US 3180945A US 139920 A US139920 A US 139920A US 13992061 A US13992061 A US 13992061A US 3180945 A US3180945 A US 3180945A
Authority
US
United States
Prior art keywords
loudspeaker
cone
speaker
voice coil
basket
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
Application number
US139920A
Inventor
Suzuki Tatsuo
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.)
WM H WELSH CO Inc
Original Assignee
WM H WELSH CO Inc
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 WM H WELSH CO Inc filed Critical WM H WELSH CO Inc
Priority to US139920A priority Critical patent/US3180945A/en
Application granted granted Critical
Publication of US3180945A publication Critical patent/US3180945A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06Loudspeakers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00Diaphragms for electromechanical transducers; Cones
    • H04R7/02Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12Non-planar diaphragms or cones
    • H04R7/14Non-planar diaphragms or cones corrugated, pleated or ribbed

Description

April 27, 1965 TATSUO SUZUKI I LOUDSPEAKER Filed Sept. 22, 1961 IN VENTOR.
United States Patent 3,180,945 LOUDSPEAKER Tatsuo Suzuki, Chicago, Ill., assignor to Wm. H. Welsh (30., Inc, a corporation of Illinois Filed Sept. 22, 1961, Ser. No. 139,920 1 Claim. (Cl. 179-115) This invention relates to a loudspeaker and more particularly to the construction of the cone of a loudspeaker.
It is an object of this invention to provide a new and improved loudspeaker having enhanced characteristics both acoustically and spatially.
There are many problems involved in designing sound systems which properly reproduce acoustical waves which are accurate representations of electrical signals.
One of the particular areas of difiiculty is in the loudspeakers used in radios, television sets and in high fidelity phonographs. Many systems have been designed which attempt to solve these problems. One such system provides several speakers, some of which are large woofer type speakers and others are small tweeter type speakers. Other solutions have been to provide very expensive and complicated speaker baffles and speaker enclosures w'hich accentuate certain of the sounds produced by the speaker and minimize others. Still a further solution has been the provision of complicated electrical cross-over circuits for splitting the sound signals between several speakers.
The problems of sound reproduction include, among others, the back pressure developed in closed systems, the inability of small speakers to properly produce lowfrequency notes and difliculties encountered in large diameter speakers in producing high-frequency notes. Additionally, speakers have resonant points which emphasize certain signals supplied to them and de-emphasize others.
It is therefore an object of this invention to provide a loudspeaker with improved resonant characteristics.
It is a more specific object of this invention to provide a loudspeaker with improved low and high frequency response characteristics.
It is still a further object of this invention to produce a loudspeaker having smaller physical dimensions which has the operating characteristics of both a small and a large speaker. Thus, the loudspeaker of the present invention is capable of being installed in a relatively small space by reason of the fact that it may be constructed in somewhat of a wedge shape.
An additional object of this invention is to provide a speaker which will produce sound waves with a high degree of fidelity corresponding to the electrical signal impulses supplied to it without providing expensive speaker enclosures.
Accordingly, one feature of this invention is to provide a dynamic loudspeaker including a support member, an electro-mechanical transducer mounted on said support member and a movable cone having a configuration defined by a surface connecting a circle having a first axis located at the center and normal to the plane of said circle and an ellipse having a second axis located at the intersection of the major and minor diameters and normal to the plane of said ellipse, the planes being spaced from each other and the axes spaced from and parallel to each other. Means are further included for joining the cone to the transducer and the support member for producing sound waves in response to actuation by the transducer.
Another feature of this invention is to provide a loudspeaker with a cone having a surface configuration defined by that portion of a conical surface contained between a pair of parallel planes intersecting the longitudinal axes of said conical surface at an acute angle.
Still a further feature is to provide an elliptical offcentered cone having its larger end elliptical in shape and its smaller end circular in shape, the end portions substantially parallel to each other, portions of said cone having relatively steep slopes and portions having relatively shallow slopes, said circular end oil center with respect to the center of the elliptical end.
Other features and advantages of the invention will be apparent from the following description taken in connection with the accompanying drawings wherein:
FIGURE 1 is a front View of a speaker incorporating the invention;
FIGURE 2 is a sectional view of the speaker of FIG- URE 1 along section lines 22; and
FIGURE 3 is a rear view of the speaker of FIGURE 1.
Referring now more specifically to FIGURE 1, therein is shown a basket or housing 11, supporting the peripheral edge of a cone 12 provided with a dust cap 13. The dust cap 13 is mounted over a voice coil (more clearly shown in FEGURE 2). A gasket 14 rigidly holds the peripheral edge of cone 12 to the basket 11. A series of corrugations represented by lines 15 are provided to stiffen the cone for movement under the urging of the voice coil along an axis substantially perpendicular to the plane of the FIGURE 1.
As best seen in FIGURE 2, a magnetic yoke 16 is mounted on a top plate 17 forming an integral part of the basket 11. A magnet 18 and a pole piece 19 are securely mounted on the magnetic yoke lo and are spaced from the top plate 17. A voice coil 20 on a cylindrical support 21 is mounted between the top plate and the pole piece for longitudinal motion along an axis 22.
The voice coil 29 is provided with a pair of terminals (not shown) for coupling it to an electrical signal reproducing system. The support member 21 is mounted on the suspension member or spider 23 for proper spacing of the voice coil with respect to the basket 11.
An additional axis 24 indicated in FIGURE 2 as a line and in FIGURE 1 as a dot represents an axis normal to the plane of the elliptical end portion and is normal to the intersection of the major and minor diameters of the elliptical end portion. In the embodiment shown, the elliptical end portion is that portion aifixed to the basket and the circular end portion that joined to the voice coil.
As shown in FIGURE 3, the basket 11 is provided with a series of cutout portions for the proper bafiling and support of the cone and voice coil assembly.
In operation, when electrical signals are provided by reproducing means current flows through voice coil 20 and reaction of the magnetic fields causes longitudinal motion of the voice coil and support 21. The circular end 25 of the cone attached to support member 21 moves with the voice coil and acoustical sound waves are generated by the surface of the cone. The corrugations prevent sectional node vibration at lower frequencies.
The portion of the cone having the shallow slope is comparable to a large diameter speaker and reproduces the low frequency notes efficiently. The portions of the cone having steep slopes generate the higher frequency sound waves well and are comparable to a speaker of small dimensions. Therefore, a loudspeaker has been provided which has the capabilities of producing with great accuracy sound waves of both high and low frequencies. Thus, where space or economic limitations do not permit the use of multiple units or extensive baffling, a speaker has been provided which to a large extent accomplishes the same results.
While I have shown and described certain embodiments of my invention, it is to be understood that it is capable of many modifications. Changes, therefore, in the construction and arrangement may be made without departing from the spirit and-scope of the invention as defined in the appended claim.
I claim: A loudspeaker comprising: a basket having an elliptical end portion and a circular end portion; a transducer References Cited by the Examiner UNITED STATES PATENTS 1,748,990 3/30 Nilson 179--1 15 2,657,758 11/53 Varnet 179115.5 2,890,760 6/59 Bobb 181-32 FOREIGN PATENTS 928,176 11/47 France. 1,071,760 8/56 Germany.
0 ROBERT H. ROSE, Primary Examiner.
WILLIAM C. COOPER, Examiner.
US139920A 1961-09-22 1961-09-22 Loudspeaker Expired - Lifetime US3180945A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US139920A US3180945A (en) 1961-09-22 1961-09-22 Loudspeaker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US139920A US3180945A (en) 1961-09-22 1961-09-22 Loudspeaker

Publications (1)

Publication Number Publication Date
US3180945A true US3180945A (en) 1965-04-27

Family

ID=22488895

Family Applications (1)

Application Number Title Priority Date Filing Date
US139920A Expired - Lifetime US3180945A (en) 1961-09-22 1961-09-22 Loudspeaker

Country Status (1)

Country Link
US (1) US3180945A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3342286A (en) * 1966-06-22 1967-09-19 Motorola Inc Compliance activated multi-diaphragm
US3464514A (en) * 1966-04-06 1969-09-02 Nippon Musical Instruments Mfg Loudspeaker
US3483946A (en) * 1967-12-30 1969-12-16 Nippon Musical Instruments Mfg Loudspeaker
US3494444A (en) * 1967-06-05 1970-02-10 Rca Corp Oval loudspeaker basket
US3622713A (en) * 1969-06-05 1971-11-23 Henri F Lassaigne Three-terminal electronic differential coupler for telephone circuits
WO1988002977A1 (en) * 1985-04-17 1988-04-21 Claes Malmqvist Arrangement in loud speakers
US20040125980A1 (en) * 2002-12-31 2004-07-01 Turnmire Patrick M. Electromagnetic transducer with asymmetric diaphragm
EP1708542A1 (en) * 2004-11-22 2006-10-04 Matsushita Electric Industrial Co., Ltd. Diaphragm and loudspeaker using same
US20070223747A1 (en) * 2006-03-24 2007-09-27 Victor Company Of Japan, Limited Narrow speaker unit and image display apparatus having the narrow speaker
KR100842606B1 (en) * 2002-04-12 2008-07-01 엘지전자 주식회사 streamlinedlow distortion diaphragm loud speaker

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1748990A (en) * 1927-12-16 1930-03-04 Ralph G Nilson Acoustic diaphragm
FR928176A (en) * 1946-05-15 1947-11-20 Diaphragm for dynamic loudspeakers
US2657758A (en) * 1949-03-31 1953-11-03 Varnet Pierre Loud-speaker
US2890760A (en) * 1956-08-16 1959-06-16 Philco Corp Transducers

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1748990A (en) * 1927-12-16 1930-03-04 Ralph G Nilson Acoustic diaphragm
FR928176A (en) * 1946-05-15 1947-11-20 Diaphragm for dynamic loudspeakers
US2657758A (en) * 1949-03-31 1953-11-03 Varnet Pierre Loud-speaker
US2890760A (en) * 1956-08-16 1959-06-16 Philco Corp Transducers

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3464514A (en) * 1966-04-06 1969-09-02 Nippon Musical Instruments Mfg Loudspeaker
US3342286A (en) * 1966-06-22 1967-09-19 Motorola Inc Compliance activated multi-diaphragm
US3494444A (en) * 1967-06-05 1970-02-10 Rca Corp Oval loudspeaker basket
US3483946A (en) * 1967-12-30 1969-12-16 Nippon Musical Instruments Mfg Loudspeaker
US3622713A (en) * 1969-06-05 1971-11-23 Henri F Lassaigne Three-terminal electronic differential coupler for telephone circuits
WO1988002977A1 (en) * 1985-04-17 1988-04-21 Claes Malmqvist Arrangement in loud speakers
KR100842606B1 (en) * 2002-04-12 2008-07-01 엘지전자 주식회사 streamlinedlow distortion diaphragm loud speaker
US20040125980A1 (en) * 2002-12-31 2004-07-01 Turnmire Patrick M. Electromagnetic transducer with asymmetric diaphragm
US20050105757A1 (en) * 2002-12-31 2005-05-19 Tummire Patrick M. Electromagnetic transducer with eccentrically mounted voice coil former
US7177440B2 (en) * 2002-12-31 2007-02-13 Step Technologies Inc. Electromagnetic transducer with asymmetric diaphragm
US7233681B2 (en) * 2002-12-31 2007-06-19 Step Technologies, Inc. Electromagnetic transducer with eccentrically mounted voice coil former
EP1708542A1 (en) * 2004-11-22 2006-10-04 Matsushita Electric Industrial Co., Ltd. Diaphragm and loudspeaker using same
EP1708542A4 (en) * 2004-11-22 2011-03-23 Panasonic Corp Diaphragm and loudspeaker using same
US20080226116A1 (en) * 2004-11-22 2008-09-18 Osamu Funahashi Diaphragm and Loudspeaker Using Same
US7627133B2 (en) * 2004-11-22 2009-12-01 Panasonic Corporation Diaphragm and loudspeaker using same
CN1930911B (en) * 2004-11-22 2011-08-03 松下电器产业株式会社 Diaphragm and loudspeaker using same
US20070223747A1 (en) * 2006-03-24 2007-09-27 Victor Company Of Japan, Limited Narrow speaker unit and image display apparatus having the narrow speaker

Similar Documents

Publication Publication Date Title
US3816672A (en) Sound reproduction system
US3636281A (en) Loudspeaker using wall as diaphragm
KR960003849B1 (en) Speaker system
US5062139A (en) Coaxial loud speaker system
US7302076B2 (en) Low profile speaker and system
US3073411A (en) Acoustical apparatus
US2539672A (en) Coaxial dual-unit electrodynamic loud-speaker
US3649776A (en) Omnidirectional horn loudspeaker
US3180945A (en) Loudspeaker
US2122587A (en) Acoustic device
US5115474A (en) Speaker system
US10681467B2 (en) Slim acoustic transducer and image display apparatus having the same
US20040008857A1 (en) Dipole radiating dynamic speaker
US2259907A (en) Sound reproducing system
US3028927A (en) Dual coaxial speaker
US3114429A (en) Loudspeaker
JP2005027286A (en) Speaker unit
US3291251A (en) Divided panel board for hi-fi speaker systems
US2873812A (en) High frequency loudspeaker structure
JPH1066195A (en) Electrostatic transducer
CN103781002A (en) Multi-vibrating-diaphragm loudspeaker
US4029910A (en) Wide dispersion loudspeaker with flexing diaphragm
CN111182426A (en) Bone conduction speaker and compound speaker
KR910004063A (en) Apparatus and method for reproducing high fidelity sound
US20190174224A1 (en) Combination phase plug, and compression driver and speaker using same