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
GB20383/24A
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.)
Neufeldt & Kuhnke
Original Assignee
Neufeldt & Kuhnke
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Filing date
Publication date
Application filed by Neufeldt & KuhnkefiledCriticalNeufeldt & Kuhnke
Publication of GB225514ApublicationCriticalpatent/GB225514A/en
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
H04R13/02—Telephone receivers
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
225,514. Neufeldt & Kuhnke. Nov. 30, 1923, [Convention date]. Magnetic instruments.-In a telephone receiver with a magnet with three poles 3, 4, 5, the middle pole 5 is spaced from the diaphragm by being formed of less height than the two outer poles, or by forming all the poles of the same height and inserting a distance ring 6 of magnetic material, such as soft iron. The magnet may be formed of four laminµ stamped from sheet metal.
GB20383/24A1923-11-301924-08-28Improvements in telephone receivers
ExpiredGB225514A
(en)