US2020814A - Driving member for electrodynamic loud speakers - Google Patents

Driving member for electrodynamic loud speakers Download PDF

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Publication number
US2020814A
US2020814A US423316A US42331630A US2020814A US 2020814 A US2020814 A US 2020814A US 423316 A US423316 A US 423316A US 42331630 A US42331630 A US 42331630A US 2020814 A US2020814 A US 2020814A
Authority
US
United States
Prior art keywords
cylinder
loud speakers
driving member
vibrating member
electrodynamic
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
US423316A
Other languages
English (en)
Inventor
Arend Thomas Van Urk
Peusken Gerrit
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 US2020814A publication Critical patent/US2020814A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/04—Construction, mounting, or centering of coil
    • H04R9/046—Construction

Definitions

  • This invention relates to loud speakers. More particularly it relates to cylindrical driving members for the dynamic or moving coil type of loud speakers.
  • the moving part With electro-dynamic telephones or loud-speakers it is important that the moving part has the lightest possible construction.
  • the moving part is constituted by a hollow cylinder having windings arranged on it, and by a vibrating member attached to the said cylinder. No matter what shape the vibrating member has, either flat or conical, its attachment to the cylinder always entails technical diificulties.
  • the hollow cylinder is made of paper or. textile fabric impregnated with a phenol condensation product and is provided with a flanged edge.
  • a flanged edge is particularly useful because the vibrating member can very easily be attached thereto.
  • the vibrating member is attached to the hollow cylinder by means of a flanged edge. If this attachment is effected by gluing, it is advisable to provide between the edge of the cylinder and the vibrating member a layer of supple textile fabric, for example flannel, to which both the cylinder and the vibrating memher are attached by gluing.
  • supple textile fabric for example flannel
  • Fig. 1 represents a hollow cylinder according to the invention
  • Fig. 2 shows a vibrating member attached to a cylinder according to Figure 1.
  • a hollow cylinder l0 made of textile fabric impregnated with a phenol condensation product is provided with a flanged edge H.
  • a hollow cylinder can be manufactured from textile fabric in a particularly simple manner because in commerce tubular fabric is obtainable which, cut to length, is extremely suitable for use as filling substance for the phenol condensation product to press therefrom a hollow cylinder as represented in Figure 1.
  • wire windings l2 and, in addition, shoe eyelets l3 and M are provided on the cylinder.
  • shoe eyelets l3 and M are provided on the cylinder.
  • leather or flannel is provided between the bent edge of the eyelet and the wall of the cylinder.
  • Figure 2 shows the manner in which the cylinder is attached to the vibrating member 15.
  • the attachment is effected with the interposition of a layer iii of supple fabric to which both the cylinder and the vibrating member are secured by gluing.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
US423316A 1929-03-02 1930-01-25 Driving member for electrodynamic loud speakers Expired - Lifetime US2020814A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL355776X 1929-03-02

Publications (1)

Publication Number Publication Date
US2020814A true US2020814A (en) 1935-11-12

Family

ID=19785213

Family Applications (1)

Application Number Title Priority Date Filing Date
US423316A Expired - Lifetime US2020814A (en) 1929-03-02 1930-01-25 Driving member for electrodynamic loud speakers

Country Status (4)

Country Link
US (1) US2020814A (enrdf_load_html_response)
BE (1) BE368021A (enrdf_load_html_response)
FR (1) FR690512A (enrdf_load_html_response)
GB (1) GB355776A (enrdf_load_html_response)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4414437A (en) * 1979-12-06 1983-11-08 Licentia Patent-Verwaltungs-Gmbh Moving coil dynamic transducer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4414437A (en) * 1979-12-06 1983-11-08 Licentia Patent-Verwaltungs-Gmbh Moving coil dynamic transducer

Also Published As

Publication number Publication date
GB355776A (en) 1931-08-28
FR690512A (fr) 1930-09-23
BE368021A (enrdf_load_html_response)

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