SE9702064D0 - telecommunications equipment - Google Patents

telecommunications equipment

Info

Publication number
SE9702064D0
SE9702064D0 SE9702064A SE9702064A SE9702064D0 SE 9702064 D0 SE9702064 D0 SE 9702064D0 SE 9702064 A SE9702064 A SE 9702064A SE 9702064 A SE9702064 A SE 9702064A SE 9702064 D0 SE9702064 D0 SE 9702064D0
Authority
SE
Sweden
Prior art keywords
magnetic
circuit
membrane
ring
pole part
Prior art date
Application number
SE9702064A
Other languages
Swedish (sv)
Other versions
SE9702064L (en
SE507872C2 (en
Inventor
Goeran Lannergren
Sture Winther
Sune Gustafsson
Original Assignee
Ericsson Telefon Ab L M
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 Ericsson Telefon Ab L M filed Critical Ericsson Telefon Ab L M
Priority to SE9702064A priority Critical patent/SE507872C2/en
Publication of SE9702064D0 publication Critical patent/SE9702064D0/en
Publication of SE9702064L publication Critical patent/SE9702064L/en
Publication of SE507872C2 publication Critical patent/SE507872C2/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/03—Constructional features of telephone transmitters or receivers, e.g. telephone hand-sets
    • 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
    • H04R9/10—Telephone receivers

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Magnetic Treatment Devices (AREA)
  • Telephone Set Structure (AREA)

Abstract

The circuit involves a permanent magnet (32), at least a first pole part (34) with a first polarity, at least a second pole part (36) with a second polarity with a ring-shaped surface (40) with an inner and outer diameter facing towards the membrane. At least one speech coil (37) is provided, where the magnetic circuit generates a magnetic alternating field which causes the membrane to vibrate, thus producing sound. The director circuit is placed over the membrane and is in the form of a ring-shaped plate (20) of magnetic material with a cavity, the diameter of which is greater than the inner diameter of the other pole part, so that a permanent magnetic field produced by the magnetic circuit is directed from the cavity to the ring part of the plate, at the same time as the magnetic alternating field is amplified from the magnetic circuit.
SE9702064A 1997-05-30 1997-05-30 Auditory arrangement for use in telephone handset SE507872C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SE9702064A SE507872C2 (en) 1997-05-30 1997-05-30 Auditory arrangement for use in telephone handset

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9702064A SE507872C2 (en) 1997-05-30 1997-05-30 Auditory arrangement for use in telephone handset

Publications (3)

Publication Number Publication Date
SE9702064D0 true SE9702064D0 (en) 1997-05-30
SE9702064L SE9702064L (en) 1998-07-20
SE507872C2 SE507872C2 (en) 1998-07-20

Family

ID=20407185

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9702064A SE507872C2 (en) 1997-05-30 1997-05-30 Auditory arrangement for use in telephone handset

Country Status (1)

Country Link
SE (1) SE507872C2 (en)

Also Published As

Publication number Publication date
SE9702064L (en) 1998-07-20
SE507872C2 (en) 1998-07-20

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Legal Events

Date Code Title Description
NUG Patent has lapsed