JPS5763995A - Diaphragm for acoustic device - Google Patents

Diaphragm for acoustic device

Info

Publication number
JPS5763995A
JPS5763995A JP13880880A JP13880880A JPS5763995A JP S5763995 A JPS5763995 A JP S5763995A JP 13880880 A JP13880880 A JP 13880880A JP 13880880 A JP13880880 A JP 13880880A JP S5763995 A JPS5763995 A JP S5763995A
Authority
JP
Japan
Prior art keywords
foamed body
disk
density
conical
result
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
JP13880880A
Other languages
Japanese (ja)
Inventor
Makoto Kobashi
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP13880880A priority Critical patent/JPS5763995A/en
Publication of JPS5763995A publication Critical patent/JPS5763995A/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
    • H04R7/04—Plane diaphragms
    • H04R7/06—Plane diaphragms comprising a plurality of sections or layers
    • H04R7/10—Plane diaphragms comprising a plurality of sections or layers comprising superposed layers in contact

Landscapes

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

Abstract

PURPOSE:To improve the degree of freedom for designing of a magnetic circuit as well as a voice coil bobbin, etc., by forming a flat plate through connecting plural porous foamed body having different levels of apparent density and thus obtaining a desired density distribution. CONSTITUTION:A porous foamed body 1a is conical in shape, and a porous foamed body 1b is conical with hole. Such foamed bodies 1a and 1b are connected together with an adhesive and formed into a disk having such a section as shown in the diagram. The surface is fixed in the ordinary way. Then the density of the foamed body 1a is set higher than that of the foamed body 1b. As a result, the density at the center part of the disk becomes higher than that at the outer circumference part. Accordingly the position of a nodal ring caused under such conditions is shifted toward the center of the disk in comparison with the case of the even density. As a result, the drive diameter of a disk-shaped diaphragm becomes smaller than the ordinary case.
JP13880880A 1980-10-06 1980-10-06 Diaphragm for acoustic device Pending JPS5763995A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13880880A JPS5763995A (en) 1980-10-06 1980-10-06 Diaphragm for acoustic device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13880880A JPS5763995A (en) 1980-10-06 1980-10-06 Diaphragm for acoustic device

Publications (1)

Publication Number Publication Date
JPS5763995A true JPS5763995A (en) 1982-04-17

Family

ID=15230714

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13880880A Pending JPS5763995A (en) 1980-10-06 1980-10-06 Diaphragm for acoustic device

Country Status (1)

Country Link
JP (1) JPS5763995A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6742622B2 (en) * 1999-03-04 2004-06-01 Pioneer Corporation Molded foam resin, process for forming the same and speaker diaphragm consisting of the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6742622B2 (en) * 1999-03-04 2004-06-01 Pioneer Corporation Molded foam resin, process for forming the same and speaker diaphragm consisting of the same

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