GB837149A - Improvements relating to electro-acoustic transducers - Google Patents

Improvements relating to electro-acoustic transducers

Info

Publication number
GB837149A
GB837149A GB38059/57A GB3805957A GB837149A GB 837149 A GB837149 A GB 837149A GB 38059/57 A GB38059/57 A GB 38059/57A GB 3805957 A GB3805957 A GB 3805957A GB 837149 A GB837149 A GB 837149A
Authority
GB
United Kingdom
Prior art keywords
channel
insulating material
magnetic
cylindrical portion
constituting
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
Application number
GB38059/57A
Inventor
Ronald Ernest Charles Brown
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.)
Siemens Edison Swan Ltd
Original Assignee
Siemens Edison Swan Ltd
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 Siemens Edison Swan Ltd filed Critical Siemens Edison Swan Ltd
Priority to GB38059/57A priority Critical patent/GB837149A/en
Publication of GB837149A publication Critical patent/GB837149A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R11/00—Transducers of moving-armature or moving-core type
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R13/00—Transducers having an acoustic diaphragm of magnetisable material directly co-acting with electromagnet

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Moving Of Heads (AREA)

Abstract

837,149. Sound receiving and transmitting devices. SIEMENS EDISON SWAN Ltd. Nov. 19, 1958 [Dec. 6, 1957], No. 38059/57. Class 40 (4). In a telephone instrument of the balanced ring armature type in which the magnetic structure includes annular magnetic members defining pole faces in the air gap between which the armature is disposed, each such annular magnetic member 1 has a cylindrical portion 2 around the outer surface of which is moulded a radially outwardly facing channel 4 of insulating material constituting a bobbin for accommodating a magnetizing coil (not shown). As shown, the member 1 also has an outwardly extending flange 3 which is recessed at 3a to receive the side wall 4a of the channel 4. The channel 4 is formed of a mouldable insulating material such as polystyrene by injection moulding, injection being through apertures 7 in the member 1 which are ultimately filled with the insulating material to key the channel 4 against rotation relatively to the member 1. Axial keying is achieved by the provision of circumferential grooves 6 (or ridges) on the outer surface of portion 2. The member 1 may be formed by pressing the inner circular portion 2<1> (Fig. 4) of a flat disc 1<1> stamped from magnetic sheet material to form the cylindrical portion 2, the outer annular portion 3<1> of the disc 1<1> constituting the flange 3. Specification 705,330 is referred to.
GB38059/57A 1957-12-06 1957-12-06 Improvements relating to electro-acoustic transducers Expired GB837149A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB38059/57A GB837149A (en) 1957-12-06 1957-12-06 Improvements relating to electro-acoustic transducers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB38059/57A GB837149A (en) 1957-12-06 1957-12-06 Improvements relating to electro-acoustic transducers

Publications (1)

Publication Number Publication Date
GB837149A true GB837149A (en) 1960-06-09

Family

ID=10400872

Family Applications (1)

Application Number Title Priority Date Filing Date
GB38059/57A Expired GB837149A (en) 1957-12-06 1957-12-06 Improvements relating to electro-acoustic transducers

Country Status (1)

Country Link
GB (1) GB837149A (en)

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