GB251663A - Improvements in or relating to loud speaking telephones - Google Patents

Improvements in or relating to loud speaking telephones

Info

Publication number
GB251663A
GB251663A GB11606/26A GB1160626A GB251663A GB 251663 A GB251663 A GB 251663A GB 11606/26 A GB11606/26 A GB 11606/26A GB 1160626 A GB1160626 A GB 1160626A GB 251663 A GB251663 A GB 251663A
Authority
GB
United Kingdom
Prior art keywords
diaphragm
loud
pleats
radiate
centre
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
GB11606/26A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB251663A publication Critical patent/GB251663A/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

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

251,663. Bowerman, G., (Assignee of Pfenninger, R.). May 4, 1925, [Convention date]. Loud - speakers magnetic instruments; diaphragms. - In a loud-speaker of the pleated diaphragm type, the point from which the pleats radiate divides a diameter of the diaphragm ring in medial section. The pleated diaphragm 2 is secured in a wooden frame 1 bv a metal ring 3, the casing 5 carrying the magnet system being attached to the frame 1 bv bars 4. The centre of the diaphragm 11 of the magnetic instrument is connected to the diaphragm 2 by a rod 14 surrounded by a compression spring 17 and carrying at its outer end a ball 16 which engages a notch 18 formed in the diaphragm 2 at the point from which the pleats radiate. The pole shoes 9 of the magnet are bevelled so as to co-operate with V-shaped armatures 10 on the diaphragm 11. Instead of two pole shoes, a larger number may be employed or a single circular pole shoe may be used. In order to eliminate the natural resonance of the diaphragm 11 it is provided with a number of holes preferably arranged in a circle disposed eccentrically with respect to the centre of the diaphragm-
GB11606/26A 1925-05-04 1926-05-03 Improvements in or relating to loud speaking telephones Expired GB251663A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE251663X 1925-05-04

Publications (1)

Publication Number Publication Date
GB251663A true GB251663A (en) 1926-10-21

Family

ID=5944060

Family Applications (1)

Application Number Title Priority Date Filing Date
GB11606/26A Expired GB251663A (en) 1925-05-04 1926-05-03 Improvements in or relating to loud speaking telephones

Country Status (1)

Country Link
GB (1) GB251663A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2903001A1 (en) * 2014-01-22 2015-08-05 Yamaha Corporation Installation structure for acoustic transducer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2903001A1 (en) * 2014-01-22 2015-08-05 Yamaha Corporation Installation structure for acoustic transducer
US9269335B2 (en) 2014-01-22 2016-02-23 Yamaha Corporation Installation structure for acoustic transducer

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