US2318517A - Loudspeaker - Google Patents

Loudspeaker Download PDF

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Publication number
US2318517A
US2318517A US316614A US31661440A US2318517A US 2318517 A US2318517 A US 2318517A US 316614 A US316614 A US 316614A US 31661440 A US31661440 A US 31661440A US 2318517 A US2318517 A US 2318517A
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United States
Prior art keywords
voice coil
compliance
mass
extending
compliances
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
US316614A
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English (en)
Inventor
Harry F Olson
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.)
RCA Corp
Original Assignee
RCA Corp
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Filing date
Publication date
Priority to NL66006D priority Critical patent/NL66006C/xx
Application filed by RCA Corp filed Critical RCA Corp
Priority to US316614A priority patent/US2318517A/en
Priority to CH223104D priority patent/CH223104A/de
Application granted granted Critical
Publication of US2318517A publication Critical patent/US2318517A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • H04R9/02—Details
    • H04R9/04—Construction, mounting, or centering of coil
    • 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
    • H04R9/12—Gramophone pick-ups using a stylus; Recorders using a stylus

Definitions

  • This invention relates to loudspeakers, and more particularly to mechanical networks therefor for controlling the high frequency response thereof.
  • the primary object of my presentinvention is to provide improved mechanical networks for loudspeakers of the dynamicA type by means of which the high frequency response may be controlled satisfactorily over a wide range.
  • Another object of my' present invention is to provide an improved vibratile system for acoustic apparatus of the dynamic or moving coil type.
  • I provide the loudspeaker with a voice coil form which extends through the cone or diaphragm
  • the form carrying the usual voice coil on that portion thereof which extends to one side ol' the diaphragm and having a compliance therein in that portion which extends to the other side of the diaphragm.
  • a small mass is attached to the end of the voice coil form in which the aforementioned compliance is formed.
  • the coil form may also be provided vwith one or more compliances in that portion thereof on which the-voice coil is mounted.
  • a dust cap I may be secured to A the diaphragm over the end of the voice coil form which carries the mass in order to reduce radiation therefrom.
  • the eiect of adding networks of this type' is the same as introducing into the equivalent electrical circuit of the vibrating systemy one or more parallel resonant networks which have the eect of providing sharp cut-oil and relatively high attenuation at the higherfrequencies.
  • Figure 1 is a view of a. loudspeaker withone form of my invention appliedv thereto.
  • Figure 2 is the equivalent electrical circuit of the vibrating system shown in Fig. 1,
  • Figure 3 is a response curve showing the frequency characteristic of the'acoustic system of Fig. l,
  • Figure 4 shows a loudspeaker system having another form of my invention embodied therein
  • Figure 5 is a wiring diagrarn of the electrical equivalent of the system of Fig. 4,
  • Figure 6 is a response curve showing the frequency characteristic of the system of Fig. 4,
  • Figure 7' shows a loudspeaker system embodying still another form of my present inventiomf
  • Figure 8 is a wiring diagram of an electrical circuit corresponding to the vibrating system of Figure.9 is a response curve showing the frequency characteristic of the system of Fig. 7,A
  • Figure 10 shows a vibrating system incorporating still another form of my invention
  • Figure 11 is a wiring diagram of an electrical 'l trical circuit equivalent to similar to that shown in Fig.
  • FIG. 13 is affragmentary view of a loudspeaker system embodying still another form of my present invention.
  • Figure 14 is a wiring and Figure 15 is a fragmentary Referring more particularly to the drawings, wherein similar reference numerals indicate corresponding parts throughout, there is shown,Y in
  • the diaphragm I may be provided with an annular rim or ilangei which 'may be clamped in place between a pair of suitablevrings 1 in well-known manner and it preferably also has secured thereto a'spider 9 for centering the voice coil form3 in the air gap of a suitable magnetic systeminot shown).
  • the voice coil form 3 has mounted thereon a suitable voice coil II on that portion thereof
  • a ring I5 is secured to the upper end of the voice coil form 3 beyond the compliance I3 to provide a mass on the form 3.
  • Fig. 2 l shows the electrical analogue of the system shown in Fig. 1.
  • the compliance c:l and the resistance r2 of the corrugation I3 and the mass mani the ring I5 form a parallel resonant circuit in series with the mass 'mi of the voice coil II, the compliance cs of the spider 3 and the impedance Ze of the cone I.
  • the driving force ,generated inv the voice coil II is designated as f in the equivalent electrical circuit of Fig. 2.
  • Fig. 7 I have shown still another niodication of my invention which embodies a, single section filter connecting the voice coil mass mi and the cone impedance Za as clearly shown in Fig. 8. This is accomplished by providing an additional corrugation or compliance Il on the the additional parallel resonant circuitlcorresponding to the mass ma, compliance ca and remass of the added portion, or lower end, of the voice coil form 3 below the compliance I3, and c: andn are,
  • Fig. 4 I have showna system which is quite Y 1 but wherein the voice coil form 3 is made somewhat longer and an additional compliance or corrugation provided therein adjacent the .voice coil II.
  • This shunting the vseries connected compliance ci and theresistance 1'1, which correspond to thecompliance and resistance, respecof the corrugation I1, across the imped- I, as clearly shown in Fig. 5.' -From an 'inspection of Fig. 3, it will be noted respectively, the compliance and resistance of g the corrugation I9. Since the impedance of the spider s is very small, it may be neglected, and the system is. therefore effectively a T type low pass iter connecting the voice coil II and the cone I.
  • Very high attenuation may be obtained at the resonance frequency of the two arms of the lter, as represented by the two parallel resonant circuits.
  • the response frequency characteristic of this modification of my invention is shown in Fig. 9, from which itwill be noted that, at 10,000 cycles, the attenuation is about 35 db., being also quite high above 10,000 cycles.
  • the additional corrugation I3 may be formed very easily by simply rolling itinto the voice coil form 3 along withthe corrugations I3 and I1 to provide a single voice'coil form having the plurality of corrugations.
  • Fig. 10 shows a system similar to that of Fig. 'I but wherein. the cone I is also provided witha corrugation or other suitable compliance 2
  • the response curve of Fig. 12 shows that, at 10,000 cycles, the attenuation of the sys-4 tem of Fig. 10 is about the same as that of Fig. '1, but above 10,000 cycles about 4 db. more attenuation is obtained with the system of Fig. 10 than with the system of Fig. 7.,
  • Fig. 13 I have shown still another modiilcation of-niy linvention which is similar to thst'of Fig. 10 but provide an additional form 23. which is secured tothe cone or diaphragm I concentrlcally with the voice coil form 3 and on the other side of the corrugation or 'compliance 2I. This provides a two-section filter, as
  • a dust cap 21 may be added to the system by securing it to the cone I over the upper end of the voice coil form 3, as clearly shown in Fig. 15;
  • Acoustic apparatus comprising, in combination, a vibratile member. a voice coll form secured thereto and extending through said member with its ends freely suspended for vibration with said member, and a. voice coil carried by said form, saidform .having a plurality of compliances therein, at least one of said compllances being on that portion of said form which extends to one side of saidmember and at least one other of said'compliances being on that portion of said form which extends to the other side of said member.
  • Acoustic apparatus comprising, in combination, a vibratile member, a voice coil form' secured thereto and extending' through said member with its ends freely suspended for vibration with said member, a voice coil carried by said form on the portion thereof extending to one side of said member,'said pory tionhaving at least one compliance therein, and a compliance in the portion of said lform ex-' tending to the,other side of said member.
  • Acoustic apparatus comprising, in combination, a vibratile member, a voice coil form secured theretoand extending through said member with its ends freely suspended for vibration with said member, a voice coil carried by said form on the vportion thereof extending to one side of said member said portion having a plurality of compliances therein in spaced relation along its length and vsaid voice coil lying between an adjacent pair'of said compliances, the mass of that, part of said voice coil form which lies beyond that one of said pair of compliances which is most remote from said vibratile member cooperating with said last named compliance to form therewith a resonant network, and a compliance in 'the portion of said form extending to the other ⁇ side of 7.
  • Acoustic apparatus comprising, in combination, a vibratile member, a voice coil form securedthereto and extending through said mem ber with its ends freely suspended for vibra;
  • Acoustic apparatus comprising, in combi-' nation, a vibratile member, a voice coil form secured thereto, said form extending through said member with at least one of its ends freely suspended for vibration with said member, a
  • voice coil carried by said form onl one side of said member, and a compliance in said form on 'the other side of said member.
  • Acoustic apparatus comprising, in combination, a vibratile member, avoice .coil form secured thereto, said form extending through said member with, its ends freely suspended for. vibration with said member, a voice coil carried by said form on one side of said member, a compliance in said form on the other sidel of ⁇ said member, and means carried bysaid form said form on the portion thereof extending-to one side of said member, said portion having a plurality of -compliances therein in spaced relation .along its length and said voice coil lying between an adjacent pair of said compliances,
  • Acoustic apparatus comprising, in combination, a vibratile member, a. voice coil form secured to said member and extending through said member with its ends freely suspended for yibration withsaid member, and a voice coil carried by said -form on the portion thereof extending to one side of said member, said form having a 'compliance in the portion thereof extending to the other side of said member, and
  • Acoustic apparatus comprising, in combination, a vibratile member, a voice coil form and extending :through said member, a 'voice coil carried by said form vibratile member cooperating with said last 'named compliance to form therewith a resonant network.
  • Acoustic apparatus comprising, in combination, a. vibratile member, a voice/coil form secured thereto-and extending through said member, a voice coil carried by said form, said form having at least one compliance, therein on that portion thereof which extendsl said member and at least'one other compliance therein on that portion thereof which extendsv to thel other ⁇ side of said member, and asecond form secured to said member in concentric relation to said voice coil form and onthat side of said member which is remote from said voice coil, said second form also having a compliance formed therein.
  • Acoustic apparatus comprising, in combination, a vibratile member, a driving element therefor, and means coupling 'said element to said member, said coupling means ⁇ extending through said member and having at least one of its ends freely suspended for vibration with said member, said coupling means also having a plurality of compliances therein, at least one of said compliances being formed in that portion of said coupling means which extends to one side of said member and at least one other formed in that portion of said coupling means whichextends to the other side of. said member.
  • Acoustic apparatus comprising, ,in combia vibratile member, a driving element side of said member, and means coupling said element to said member and extending through saidI member beyond the other side thereof,saldmeans having a comv pliance therein in its extension beyond said other side and the end of said extension being freely supported for vibration with said member.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
US316614A 1940-01-31 1940-01-31 Loudspeaker Expired - Lifetime US2318517A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
NL66006D NL66006C (en(2012)) 1940-01-31
US316614A US2318517A (en) 1940-01-31 1940-01-31 Loudspeaker
CH223104D CH223104A (de) 1940-01-31 1941-04-17 Elektrodynamischer Lautsprecher.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US316614A US2318517A (en) 1940-01-31 1940-01-31 Loudspeaker

Publications (1)

Publication Number Publication Date
US2318517A true US2318517A (en) 1943-05-04

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ID=23229817

Family Applications (1)

Application Number Title Priority Date Filing Date
US316614A Expired - Lifetime US2318517A (en) 1940-01-31 1940-01-31 Loudspeaker

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US (1) US2318517A (en(2012))
CH (1) CH223104A (en(2012))
NL (1) NL66006C (en(2012))

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2489862A (en) * 1943-01-07 1949-11-29 Gen Electric Damping for dynamic loudspeakers
US2830283A (en) * 1950-04-18 1958-04-08 Massa Frank Directional characteristics of electroacoustic transducers and method for utilizing the same
US3838216A (en) * 1972-02-23 1974-09-24 W Watkins Device to effectively eliminate the motion induced back emf in a loudspeaker system in the region of fundamental acoustic resonance
US4387275A (en) * 1979-11-09 1983-06-07 Matsushita Electric Industrial Co., Ltd. Speaker and speaker system
US20060133637A1 (en) * 2004-12-16 2006-06-22 Jl Audio, Inc. Loudspeaker with integrated spider standoff ring
GB2516936A (en) * 2013-08-07 2015-02-11 Monitor Audio Ltd Loudspeaker driver

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1288146B (de) * 1962-10-31 1969-01-30 Siemens Ag Elektroakustischer Wandler

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2489862A (en) * 1943-01-07 1949-11-29 Gen Electric Damping for dynamic loudspeakers
US2830283A (en) * 1950-04-18 1958-04-08 Massa Frank Directional characteristics of electroacoustic transducers and method for utilizing the same
US3838216A (en) * 1972-02-23 1974-09-24 W Watkins Device to effectively eliminate the motion induced back emf in a loudspeaker system in the region of fundamental acoustic resonance
US4387275A (en) * 1979-11-09 1983-06-07 Matsushita Electric Industrial Co., Ltd. Speaker and speaker system
US20060133637A1 (en) * 2004-12-16 2006-06-22 Jl Audio, Inc. Loudspeaker with integrated spider standoff ring
US7379558B2 (en) 2004-12-16 2008-05-27 Jl Audio, Inc. Loudspeaker with integrated spider standoff ring
GB2516936A (en) * 2013-08-07 2015-02-11 Monitor Audio Ltd Loudspeaker driver

Also Published As

Publication number Publication date
CH223104A (de) 1942-08-31
NL66006C (en(2012))

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