ES420820A1 - Mejoras en los microfonos de carbon. - Google Patents

Mejoras en los microfonos de carbon.

Info

Publication number
ES420820A1
ES420820A1 ES420820A ES420820A ES420820A1 ES 420820 A1 ES420820 A1 ES 420820A1 ES 420820 A ES420820 A ES 420820A ES 420820 A ES420820 A ES 420820A ES 420820 A1 ES420820 A1 ES 420820A1
Authority
ES
Spain
Prior art keywords
carbon
mixture
carbon microphone
powder lubricant
microphone
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
ES420820A
Other languages
English (en)
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.)
Nokia Spain SA
Original Assignee
Alcatel Espana SA
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 Alcatel Espana SA filed Critical Alcatel Espana SA
Publication of ES420820A1 publication Critical patent/ES420820A1/es
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
    • H04R21/00—Variable-resistance transducers
    • H04R21/02—Microphones
    • H04R21/021—Microphones with granular resistance material

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Lubricants (AREA)
  • Telephone Set Structure (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Carbon And Carbon Compounds (AREA)
ES420820A 1972-11-24 1973-11-24 Mejoras en los microfonos de carbon. Expired ES420820A1 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5431472A GB1360559A (en) 1972-11-24 1972-11-24 Carbon microphone

Publications (1)

Publication Number Publication Date
ES420820A1 true ES420820A1 (es) 1976-04-01

Family

ID=10470609

Family Applications (1)

Application Number Title Priority Date Filing Date
ES420820A Expired ES420820A1 (es) 1972-11-24 1973-11-24 Mejoras en los microfonos de carbon.

Country Status (15)

Country Link
US (1) US3859478A (es)
JP (1) JPS4984430A (es)
AR (1) AR199010A1 (es)
AT (1) ATA982873A (es)
AU (1) AU6192973A (es)
BE (1) BE807626A (es)
BR (1) BR7308746D0 (es)
CA (1) CA995349A (es)
CH (1) CH558626A (es)
DE (1) DE2358243A1 (es)
ES (1) ES420820A1 (es)
FR (1) FR2208266B3 (es)
GB (1) GB1360559A (es)
IT (1) IT1001915B (es)
NL (1) NL7315631A (es)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5541570A (en) * 1994-12-09 1996-07-30 Force Imaging Technologies, Inc. Force sensing ink, method of making same and improved force sensor

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US486244A (en) * 1892-11-15 Charles clamond
US919908A (en) * 1908-07-13 1909-04-27 Harold Sheen Martin Electrical-resistance device.
US1086726A (en) * 1909-03-11 1914-02-10 Johan Burchardt Opsahl Resistance unit.

Also Published As

Publication number Publication date
IT1001915B (it) 1976-04-30
AR199010A1 (es) 1974-07-31
NL7315631A (es) 1974-05-28
CA995349A (en) 1976-08-17
GB1360559A (en) 1974-07-17
JPS4984430A (es) 1974-08-14
ATA982873A (de) 1976-05-15
FR2208266A1 (es) 1974-06-21
BR7308746D0 (pt) 1974-08-22
DE2358243A1 (de) 1974-05-30
AU6192973A (en) 1975-05-01
FR2208266B3 (es) 1976-10-08
CH558626A (de) 1975-01-31
US3859478A (en) 1975-01-07
BE807626A (nl) 1974-05-22

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