US2221068A - Electrodynamic loudspeaker - Google Patents

Electrodynamic loudspeaker Download PDF

Info

Publication number
US2221068A
US2221068A US223007A US22300738A US2221068A US 2221068 A US2221068 A US 2221068A US 223007 A US223007 A US 223007A US 22300738 A US22300738 A US 22300738A US 2221068 A US2221068 A US 2221068A
Authority
US
United States
Prior art keywords
fibrous material
coil form
centering member
centering
apertures
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
US223007A
Other languages
English (en)
Inventor
Alons Luitje
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
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 RCA Corp filed Critical RCA Corp
Application granted granted Critical
Publication of US2221068A publication Critical patent/US2221068A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • H04R7/16—Mounting or tensioning of diaphragms or cones
    • 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
    • H04R9/041—Centering
    • 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

Definitions

  • This invention relates to a vibrating member for an electrodynamic oscillation converter or loudspeaker for transforming electric oscillations 7 into acoustic vibrations or vice versa, said meme her being constituted by a diaphragm and a coil form having a centering member.
  • the invention has for its object to avoid this disadvantage in that the coil form and the centering member are united not by gluing but by means of a matter moulded from a. fibrous material. Such union does not bring about a rigid point of union and is in addition light by weight.
  • the entire centering member is preferablymade by moulding from a fibrous material, parts of the coil form being introduced into the fibrous material of the centering member.
  • -A centering spider of this kind is light by weight and most resilient normally to its plane.
  • I f Fig. 1 is a sectional View showing a coil form and a centering member connected thereto by moulding and also a part of the diaphragm and of the frame.
  • Fig. 2 is a plan thereof.
  • Fig. 3 shows the manufacture of the centering member of the coil form.
  • Fig. 1 designates a coil form of hard paper carrying a coil H. At one of its ends the form it has formed in it a series of apertures !2. When the centering spider I3 is being moulded from the fibrous material the latter penetrates into these apertures so that after drying and compression of the spider the form is rigidly connected to it.
  • Such leaves made entirely of dipped moulded fibrous material are very light by weight and resilient in a direction normal to their planes but rigid in the direction of their planes so that they are especially suitable as a centering spider since they afford proper centering but reduce but little the sensitiveness of the vibrating system.
  • the corrugations M of the spider enable larger amplitudes of the coil form during oscillation.
  • the leading-in wires it and i! for the coil are laid on the moulding form so that they are inserted into the fibrous material.
  • the fact that they are surrounded on all sides by the fibrous material ensures attachmentfree from rustling noise and. renders the leading-in wires safe from mechanical damage.
  • the material of the spider I3 is thick and is secured to the frame by means of a clamping ring 20 which is screwed to the 25 frame !5 by means of screws 2!.
  • the connecting terminals 22 and 23 for the coil are arranged on two small plates 24 and 25 of insulating material fixed to the frame.
  • Fig. 3 shows a method of manufacturing the 30 centering spider of the coil form It].
  • the moulding form 21 made of perforated sheet iron or wire gauze is first dipped without coil form into the aqueous fibrous material so that a thin layer of fibrous material is deposited throughout the 35 whole form.
  • the liquid is removed from the fibrous material that deposits on the form 21 by means of channels communicating with the sucking chamber 30 through passages 28 and bores 29 and is carried off through a tube con- 40 ductor 32.
  • the coil form I0 is then put with the coil II and the leading-in wires on a mandrel 26 which is connected to the moulding form and the conductors I6 and H are laid on the thin fibrous 45 layer already provided on the form and are forced into the corrugations 3! of the form.
  • the end of the coil form which comprises the apertures I2 is also located over an active part of the moulding form which part is already 50 provided with a thin fibrous layer, which enables the fibrous material also to deposit in and at the side of the apertures of the form.
  • the layer becomes 55 further deposited so that similar to the lower end of the coil form ll] in'which the apertures I2 are formed the current leads l6 and I1 are surrounded by the fibrous material.
  • the coil form ill is connected to the member and the current leads are embedded in the material.
  • an electrodynamic loudspeaker provided with a voice coil form and a centering member
  • the method of uniting the centering member with the voice coil form which consists in forming apertures at one end of the Voice coil form, producing the centering member by accreting and integrating fibrous material upon a porous mold, and depositing during the formation of the centering member some of the accreted and integrated fibrous material within the apertures 10 of the voice coil form.
  • an electrodynamic loudspeaker provided with a voice coil form having cut-out portions and a centering member
  • themethod of uniting the centering member with the voice coil form which consists in forming the centering member zby accreting and integrating fibrous material upon a porous mold, and depositing during the formation of the centering member some of the accreted and integrated fibrous material within the cut-out portions of the voice coil form,
  • a voice coil having terminal conductors and a centering member
  • the method of assembly which consists in forming the centering member by accreting and integrating fibrous material upon a porous mold, depositing during the formation of the centering member some of theaccreted and integrated fibrous material within the apertures of the voice coil form, and embedding the voice coil terminal conductors between layers of the fibrous material in the formation of the centering member.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
US223007A 1938-01-24 1938-08-04 Electrodynamic loudspeaker Expired - Lifetime US2221068A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE208381X 1938-01-24

Publications (1)

Publication Number Publication Date
US2221068A true US2221068A (en) 1940-11-12

Family

ID=5794205

Family Applications (1)

Application Number Title Priority Date Filing Date
US223007A Expired - Lifetime US2221068A (en) 1938-01-24 1938-08-04 Electrodynamic loudspeaker

Country Status (6)

Country Link
US (1) US2221068A (xx)
BE (1) BE432333A (xx)
CH (1) CH208381A (xx)
FR (1) FR849298A (xx)
GB (1) GB511920A (xx)
NL (1) NL56193C (xx)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2526836A (en) * 1944-12-08 1950-10-24 Reproducers And Amplifiers Ltd Electrodynamic sound reproducer
DE854054C (de) * 1950-02-22 1952-10-30 Max Grundig Antriebs- und Zentriersystem fuer dynamische Lautsprecher, Mikrophone und Relais aus thermoplastischem Kunststoff
DE892145C (de) * 1950-06-06 1953-10-05 Helmut Hintze Zentriermembran, insbesondere fuer die Zentrierung akustischer Schwinger
DE915250C (de) * 1948-10-02 1954-07-19 Licentia Gmbh Trockengleichrichter, insbesondere fuer Messzwecke
US2922850A (en) * 1957-01-28 1960-01-26 Gen Electric Loud-speaker
US3014996A (en) * 1956-05-18 1961-12-26 Swanson Carl Axel Speaker construction
US3032615A (en) * 1960-02-02 1962-05-01 Rca Corp Acoustic devices
US3484730A (en) * 1968-03-07 1969-12-16 Us Navy Tunable high frequency electrodynamic driver
US5008945A (en) * 1988-05-23 1991-04-16 Pioneer Electronic Corp. Water-proof speaker unit
US5091958A (en) * 1989-04-19 1992-02-25 Kabushiki Kaisha Kenwood Wiring structure of loudspeaker
US5249236A (en) * 1989-12-01 1993-09-28 Kabushiki Kaisha Kenwood Wiring structure of loudspeaker
EP0702501A3 (de) * 1994-09-13 1996-06-05 Blaupunkt Werke Gmbh Dynamischer Lautsprecher mit einer Zentriermembran
US6269167B1 (en) 1994-03-29 2001-07-31 Harman International Industries, Incorporated Loudspeaker spider, method of making it and loudspeaker incorporating it
US20050111689A1 (en) * 2003-11-21 2005-05-26 True Technologies Inc. Loudspeaker with assembly and performance improvements
US20050271240A1 (en) * 2004-05-27 2005-12-08 Pioneer Corporation Speaker device and method of manufacturing the speaker device
US20060002580A1 (en) * 2004-07-02 2006-01-05 Hiroshi Ohara Loudspeaker spider with enhanced structure
US20060133637A1 (en) * 2004-12-16 2006-06-22 Jl Audio, Inc. Loudspeaker with integrated spider standoff ring

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2526836A (en) * 1944-12-08 1950-10-24 Reproducers And Amplifiers Ltd Electrodynamic sound reproducer
DE915250C (de) * 1948-10-02 1954-07-19 Licentia Gmbh Trockengleichrichter, insbesondere fuer Messzwecke
DE854054C (de) * 1950-02-22 1952-10-30 Max Grundig Antriebs- und Zentriersystem fuer dynamische Lautsprecher, Mikrophone und Relais aus thermoplastischem Kunststoff
DE892145C (de) * 1950-06-06 1953-10-05 Helmut Hintze Zentriermembran, insbesondere fuer die Zentrierung akustischer Schwinger
US3014996A (en) * 1956-05-18 1961-12-26 Swanson Carl Axel Speaker construction
US2922850A (en) * 1957-01-28 1960-01-26 Gen Electric Loud-speaker
US3032615A (en) * 1960-02-02 1962-05-01 Rca Corp Acoustic devices
US3484730A (en) * 1968-03-07 1969-12-16 Us Navy Tunable high frequency electrodynamic driver
US5008945A (en) * 1988-05-23 1991-04-16 Pioneer Electronic Corp. Water-proof speaker unit
US5091958A (en) * 1989-04-19 1992-02-25 Kabushiki Kaisha Kenwood Wiring structure of loudspeaker
US5249236A (en) * 1989-12-01 1993-09-28 Kabushiki Kaisha Kenwood Wiring structure of loudspeaker
US6269167B1 (en) 1994-03-29 2001-07-31 Harman International Industries, Incorporated Loudspeaker spider, method of making it and loudspeaker incorporating it
US7082667B2 (en) 1994-03-29 2006-08-01 Harman International Industries, Incorporated Method of making a loudspeaker
EP0702501A3 (de) * 1994-09-13 1996-06-05 Blaupunkt Werke Gmbh Dynamischer Lautsprecher mit einer Zentriermembran
US20050111689A1 (en) * 2003-11-21 2005-05-26 True Technologies Inc. Loudspeaker with assembly and performance improvements
US20050271240A1 (en) * 2004-05-27 2005-12-08 Pioneer Corporation Speaker device and method of manufacturing the speaker device
US20060002580A1 (en) * 2004-07-02 2006-01-05 Hiroshi Ohara Loudspeaker spider with enhanced structure
US7200240B2 (en) * 2004-07-02 2007-04-03 Hiroshi Ohara Loudspeaker spider with enhanced structure
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

Also Published As

Publication number Publication date
GB511920A (en) 1939-08-25
BE432333A (xx)
NL56193C (xx)
CH208381A (de) 1940-01-31
FR849298A (fr) 1939-11-17

Similar Documents

Publication Publication Date Title
US2221068A (en) Electrodynamic loudspeaker
US2226745A (en) Radio frame and the like
US3796839A (en) Loud speaker system
US2974204A (en) Transducer
JPH06284499A (ja) スピーカ構造
US2007747A (en) Acoustic apparatus
DE2166848A1 (de) Elektroakustischer wandler
US1964606A (en) Acoustic device
US2551556A (en) Acoustic diaphragm with plural voice coil supports
US2538621A (en) Electrodynamic transducer and connector therefor
US1707544A (en) Electrodynamic device
US3516151A (en) Electrodynamic transducer and method of manufacturing same
US2288832A (en) Fibrous acoustic diaphragm
US1884385A (en) Electrical apparatus and method of making terminal strips therefor
US2469773A (en) Loud-speaker diaphragm support member
US2064819A (en) Condenser
US2526836A (en) Electrodynamic sound reproducer
US2818130A (en) Loudspeaker diaphragms
US2206517A (en) Electroacoustic apparatus
US2025087A (en) Acoustic device
US1393515A (en) Diaphragm and method of making such diaphragms
US1430634A (en) Means for manufacturing an article of a plurality of parts
JPH07111697A (ja) スピーカ
EP0065883A2 (en) Ring radiator for loudspeakers
US2196352A (en) Sound reproducing device