JPS5623097A - Diaphragm for speaker and its production - Google Patents

Diaphragm for speaker and its production

Info

Publication number
JPS5623097A
JPS5623097A JP9894379A JP9894379A JPS5623097A JP S5623097 A JPS5623097 A JP S5623097A JP 9894379 A JP9894379 A JP 9894379A JP 9894379 A JP9894379 A JP 9894379A JP S5623097 A JPS5623097 A JP S5623097A
Authority
JP
Japan
Prior art keywords
diaphragm
polyurethane
closed mold
center
foaming magnification
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.)
Pending
Application number
JP9894379A
Other languages
Japanese (ja)
Inventor
Hirotoshi Niiguchi
Toru Yamamoto
Mitsuru Yashiro
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP9894379A priority Critical patent/JPS5623097A/en
Publication of JPS5623097A publication Critical patent/JPS5623097A/en
Pending 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
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Abstract

PURPOSE:To make it possible to obtain a light-weight and large-internal loss diaphragm, by using a polyurethane, which has independent bubbles of a higher foaming magnification toward the center, as the diaphragm. CONSTITUTION:Diaphragm 3 is formed with a polyurethane which has independent bubbles of a higher foaming magnification toward the center. Therefore, diaphragm 3 is low-density and light-weight and has a three-dimensional structure, so that stiffness can be improved and elastic modulus and internal loss can be high in diaphragm 3. For production of this diaphragm, isocyanate, polyol, and a blowing agent are mixed, and this liquid material is injected into a closed mold immediately. In this closed mold, polymerization reaction is caused to form a polyurethane, and the blowing agent is decomposed by heat generated at this time. In this case, the polyurethane is hardly foamed in parts brought into contact with the closed mold and forms independent bubbles of a higher foaming magnification toward the center because the temperature of the closed mold is low.
JP9894379A 1979-08-01 1979-08-01 Diaphragm for speaker and its production Pending JPS5623097A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9894379A JPS5623097A (en) 1979-08-01 1979-08-01 Diaphragm for speaker and its production

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9894379A JPS5623097A (en) 1979-08-01 1979-08-01 Diaphragm for speaker and its production

Publications (1)

Publication Number Publication Date
JPS5623097A true JPS5623097A (en) 1981-03-04

Family

ID=14233182

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9894379A Pending JPS5623097A (en) 1979-08-01 1979-08-01 Diaphragm for speaker and its production

Country Status (1)

Country Link
JP (1) JPS5623097A (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5876892A (en) * 1981-10-30 1983-05-10 日本電気株式会社 Voice recognition equipment
WO2000054555A1 (en) * 1999-03-09 2000-09-14 Inoac Corporation Speaker edge
JP2000343554A (en) * 1995-06-14 2000-12-12 Pioneer Electronic Corp Injection foam molded body and speaker diaphragm prepared by using injection foam molded body
GB2358545A (en) * 1999-10-28 2001-07-25 Goodmans Loudspeakers Ltd Partially hollow loudspeaker components
JP2005328297A (en) * 2004-05-13 2005-11-24 Sony Corp Diaphragm of speaker and method for manufacturing diaphragm of speaker
CN114827875A (en) * 2021-01-29 2022-07-29 歌尔股份有限公司 Vibrating diaphragm and sound generating device
CN114827879A (en) * 2021-01-29 2022-07-29 歌尔股份有限公司 Vibrating diaphragm and sound generating device
CN114827878A (en) * 2021-01-29 2022-07-29 歌尔股份有限公司 Vibrating diaphragm and sound generating device
CN114827870A (en) * 2021-01-29 2022-07-29 歌尔股份有限公司 Vibrating diaphragm and sound generating device
CN114827876A (en) * 2021-01-29 2022-07-29 歌尔股份有限公司 Vibrating diaphragm and sound generating device
CN114827877A (en) * 2021-01-29 2022-07-29 歌尔股份有限公司 Vibrating diaphragm and sound generating device

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5876892A (en) * 1981-10-30 1983-05-10 日本電気株式会社 Voice recognition equipment
JPH0119597B2 (en) * 1981-10-30 1989-04-12 Nippon Electric Co
JP2000343554A (en) * 1995-06-14 2000-12-12 Pioneer Electronic Corp Injection foam molded body and speaker diaphragm prepared by using injection foam molded body
WO2000054555A1 (en) * 1999-03-09 2000-09-14 Inoac Corporation Speaker edge
US6543574B1 (en) 1999-03-09 2003-04-08 Inoac Corporation Method of making a speaker edge containing isocyanate and polyol
GB2358545A (en) * 1999-10-28 2001-07-25 Goodmans Loudspeakers Ltd Partially hollow loudspeaker components
GB2358545B (en) * 1999-10-28 2004-04-14 Goodmans Loudspeakers Ltd Loudspeaker
JP2005328297A (en) * 2004-05-13 2005-11-24 Sony Corp Diaphragm of speaker and method for manufacturing diaphragm of speaker
CN114827878A (en) * 2021-01-29 2022-07-29 歌尔股份有限公司 Vibrating diaphragm and sound generating device
CN114827879A (en) * 2021-01-29 2022-07-29 歌尔股份有限公司 Vibrating diaphragm and sound generating device
CN114827875A (en) * 2021-01-29 2022-07-29 歌尔股份有限公司 Vibrating diaphragm and sound generating device
CN114827870A (en) * 2021-01-29 2022-07-29 歌尔股份有限公司 Vibrating diaphragm and sound generating device
CN114827876A (en) * 2021-01-29 2022-07-29 歌尔股份有限公司 Vibrating diaphragm and sound generating device
CN114827877A (en) * 2021-01-29 2022-07-29 歌尔股份有限公司 Vibrating diaphragm and sound generating device
WO2022160947A1 (en) * 2021-01-29 2022-08-04 歌尔股份有限公司 Diaphragm and sound generation device
WO2022160688A1 (en) * 2021-01-29 2022-08-04 歌尔股份有限公司 Diaphragm and sound generating apparatus
CN114827878B (en) * 2021-01-29 2023-08-08 歌尔股份有限公司 Vibrating diaphragm and sound generating device
CN114827876B (en) * 2021-01-29 2023-08-08 歌尔股份有限公司 Vibrating diaphragm and sound generating device
CN114827879B (en) * 2021-01-29 2023-08-08 歌尔股份有限公司 Vibrating diaphragm and sound generating device
CN114827877B (en) * 2021-01-29 2023-08-08 歌尔股份有限公司 Vibrating diaphragm and sound generating device
CN114827875B (en) * 2021-01-29 2023-08-08 歌尔股份有限公司 Vibrating diaphragm and sound generating device

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