US2852627A - Telephone and microphone - Google Patents

Telephone and microphone Download PDF

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Publication number
US2852627A
US2852627A US520886A US52088655A US2852627A US 2852627 A US2852627 A US 2852627A US 520886 A US520886 A US 520886A US 52088655 A US52088655 A US 52088655A US 2852627 A US2852627 A US 2852627A
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US
United States
Prior art keywords
telephone
microphone
foil
chamber
poleshoes
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
US520886A
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English (en)
Inventor
Schenkel 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.)
US Philips Corp
North American Philips Co Inc
Original Assignee
US Philips 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 US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US2852627A publication Critical patent/US2852627A/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
    • H04R13/00—Transducers having an acoustic diaphragm of magnetisable material directly co-acting with electromagnet

Definitions

  • the present invention relates to an improved telephone and microphone. More particularly, the invention relates to improvements in electromagnetic telephones and microphones and more particularly to an improved structure for a closed chamber situated behind a diaphragm and having an acoustical resistance in a wall of the chamber.
  • the acoustical resistance generally consists of an opening provided in a wall of the chamber, which opening is covered or filled with a material such as, for example, nylon, the acoustical resistance of which is so chosen that the chamber acts as a resonator in the range which is favorable for the frequency response curve of the telephone and microphone.
  • a wall of the chamber at the two poleshoes is sealed by means of lute which is provided after assembling the system and prior to providing the diaphragm.
  • the chamber behind the diaphragm at the poleshoes is closed by means of a foil made of non-magnetic material.
  • the apparatus of the present invention has an advantage over known electromagnetic apparatus, which have luted joints in their acoustical chambers, in that disturbances caused by the vibration of wire-like projections of lute are avoided. Joints which are united with soft lutes usually form such wire-like projections as a result of the contact between the diaphragm and the luted portion of the chamber, whereas the apparatus of the present invention entirely eliminates the use of luted joints.
  • the air-gap is very efficiently protected against fouling, particularly by small particles from the poleshoes which, in the known constructions, are fixed in the lute but which may gain access to the air-gap in due time and render the telephone and microphone unserviceable.
  • the telephone comprises a chamber 1 which is situated behind the diaphragm 2 and closed except for the acoustical resistance, that is, an opening 3 which is filled with a material having a predetermined acoustical resistance.
  • the telephone furthermore comprises a magnet 4 contiguous with two poleshoes 5 and 6 carrying a winding 7. Opening 3 is provided in cover 8 and two additional openings are also provided in cover 8 with sufiicient clearance so that the ends of poleshoes 5 and 6 may engage foil 9. The engagement of foil 9 with cover 8 and the ends of the poleshoes 5 and 6 seals ofi chamber 1.
  • the foil may, for example, consist of aluminum or other non-magnetic material such as acetobutyrate and is, for example, 10 to 20 microns thick.
  • the aperture 3 is not covered with foil 9, in order to permit the passage of ambient air through the acoustical resistance material.
  • a telephone and microphone comprising an openended receptacle, an electromagnet having spaced-apart poleshoes in said receptacle contiguous with said electromagnet, a closure means on said receptacle for forming an acoustical chamber therein, said closure means having at least three apertures therein, an acoustical plug of predetermined acoustical resistance in one of the apertures of said closure means, the ends of said poleshoes extending through the other apertures in said closure means, a non-magnetic foil superposed and engaging a large portion of said closure means and over the ends of the pole shoes, said foil having an opening therein substantially the same size as said one aperture in the closure means and a-diaphragm mounted adjacent said foil, the ends of said pole shoes engaging said foil at adjacent portions thereof.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Telephone Set Structure (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
US520886A 1954-07-23 1955-07-08 Telephone and microphone Expired - Lifetime US2852627A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL331379X 1954-07-23

Publications (1)

Publication Number Publication Date
US2852627A true US2852627A (en) 1958-09-16

Family

ID=19784383

Family Applications (1)

Application Number Title Priority Date Filing Date
US520886A Expired - Lifetime US2852627A (en) 1954-07-23 1955-07-08 Telephone and microphone

Country Status (5)

Country Link
US (1) US2852627A (enrdf_load_stackoverflow)
BE (1) BE540009A (enrdf_load_stackoverflow)
CH (1) CH331379A (enrdf_load_stackoverflow)
GB (1) GB791295A (enrdf_load_stackoverflow)
NL (1) NL85836C (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3179749A (en) * 1960-03-03 1965-04-20 Milton L Snow Telephone instrument controlling device
US3261927A (en) * 1961-02-10 1966-07-19 Siemens Ag Electroacoustic transducer comprising a magnetic system with annular air gap and a resonator

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1644788A (en) * 1922-12-08 1927-10-11 Western Electric Co Acoustic device
US2249161A (en) * 1939-05-19 1941-07-15 Bell Telephone Labor Inc Electroacoustic device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1644788A (en) * 1922-12-08 1927-10-11 Western Electric Co Acoustic device
US2249161A (en) * 1939-05-19 1941-07-15 Bell Telephone Labor Inc Electroacoustic device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3179749A (en) * 1960-03-03 1965-04-20 Milton L Snow Telephone instrument controlling device
US3261927A (en) * 1961-02-10 1966-07-19 Siemens Ag Electroacoustic transducer comprising a magnetic system with annular air gap and a resonator

Also Published As

Publication number Publication date
GB791295A (en) 1958-02-26
CH331379A (de) 1958-07-15
NL85836C (enrdf_load_stackoverflow)
BE540009A (enrdf_load_stackoverflow)

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