DE2164691C3 - Kohiemikrophon - Google Patents

Kohiemikrophon

Info

Publication number
DE2164691C3
DE2164691C3 DE2164691A DE2164691A DE2164691C3 DE 2164691 C3 DE2164691 C3 DE 2164691C3 DE 2164691 A DE2164691 A DE 2164691A DE 2164691 A DE2164691 A DE 2164691A DE 2164691 C3 DE2164691 C3 DE 2164691C3
Authority
DE
Germany
Prior art keywords
carbon
microspheres
hollow
pitch
temperature
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
DE2164691A
Other languages
German (de)
English (en)
Other versions
DE2164691B2 (de
DE2164691A1 (de
Inventor
Yasuo Amagi
Masaaki Urawa Saitama Nakao
Zenya Shiiki
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.)
Kureha Corp
Toyobo Co Ltd
Original Assignee
Kureha Corp
Toyobo Co Ltd
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 Kureha Corp, Toyobo Co Ltd filed Critical Kureha Corp
Publication of DE2164691A1 publication Critical patent/DE2164691A1/de
Publication of DE2164691B2 publication Critical patent/DE2164691B2/de
Application granted granted Critical
Publication of DE2164691C3 publication Critical patent/DE2164691C3/de
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
    • C04B35/52—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R21/00—Variable-resistance transducers
    • H04R21/02—Microphones
    • H04R21/021—Microphones with granular resistance material

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Ceramic Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Carbon And Carbon Compounds (AREA)
DE2164691A 1970-12-29 1971-12-27 Kohiemikrophon Expired DE2164691C3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45120975A JPS4939015B1 (https=) 1970-12-29 1970-12-29

Publications (3)

Publication Number Publication Date
DE2164691A1 DE2164691A1 (de) 1972-07-13
DE2164691B2 DE2164691B2 (de) 1979-03-15
DE2164691C3 true DE2164691C3 (de) 1979-10-31

Family

ID=14799655

Family Applications (1)

Application Number Title Priority Date Filing Date
DE2164691A Expired DE2164691C3 (de) 1970-12-29 1971-12-27 Kohiemikrophon

Country Status (4)

Country Link
US (1) US3835266A (https=)
JP (1) JPS4939015B1 (https=)
DE (1) DE2164691C3 (https=)
GB (1) GB1366159A (https=)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4952963U (https=) * 1972-08-15 1974-05-10
JPH02125764U (https=) * 1989-03-24 1990-10-17
ES2155741B1 (es) * 1998-04-03 2001-12-01 Consejo Superior Investigacion Fabricacion de granulos de carbono para su uso en microfonos.
CN106744783B (zh) * 2017-03-20 2018-12-25 福州大学 一种石墨化空心炭微球的制备方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2697136A (en) * 1951-04-28 1954-12-14 Bell Telephone Labor Inc Microphone and microphone granules
FR1458195A (fr) * 1965-05-31 1966-11-10 Charbonnages De France Microbilles de carbone et leur procédé de fabrication

Also Published As

Publication number Publication date
DE2164691B2 (de) 1979-03-15
JPS4939015B1 (https=) 1974-10-22
DE2164691A1 (de) 1972-07-13
US3835266A (en) 1974-09-10
GB1366159A (en) 1974-09-11

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Legal Events

Date Code Title Description
C3 Grant after two publication steps (3rd publication)
EHJ Ceased/non-payment of the annual fee