US1700530A - Acoustic diaphragm - Google Patents

Acoustic diaphragm Download PDF

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Publication number
US1700530A
US1700530A US115471A US11547126A US1700530A US 1700530 A US1700530 A US 1700530A US 115471 A US115471 A US 115471A US 11547126 A US11547126 A US 11547126A US 1700530 A US1700530 A US 1700530A
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United States
Prior art keywords
diaphragm
acoustic diaphragm
moisture
acoustic
carbonized
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
US115471A
Inventor
Newman H Holland
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AT&T Corp
Original Assignee
Bell Telephone Laboratories Inc
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Filing date
Publication date
Application filed by Bell Telephone Laboratories Inc filed Critical Bell Telephone Laboratories Inc
Priority to US115471A priority Critical patent/US1700530A/en
Application granted granted Critical
Publication of US1700530A publication Critical patent/US1700530A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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

Definitions

  • This invention relates to acoustic diaphragms and more especially to such diaphragms for use in phonographs or loud speakers as sound radiators.
  • the object of this invention is to provide a diaphragm which has high elastic reactance and small mass and which can be economically produced.
  • a diaphragm is produced by carbonizing a piece of organic material and then coating or plating it with a material impervious to moisture.
  • Fig. 1 is a front View of the diaphragm and Fig. 2 shows the diaphragm in section and mounted in a phonograph sound box.
  • the midportion 11 of the diaphragm is of cork or 7 other material which has been carbonized by the well known process of dry distillation so that only a cellular or honeycomb structure of carbon remains.
  • This piece so treated is then coated with a thin film 12 of a substance which is moisture proof.
  • a substance may be copper, aluminum or similar material and may be electrochemically deposited 4 or applied as a foil. It is essential that this coating be very thin so that the mass is not materially increased and although a metallic coating is not necessarily required it is preferred.
  • the outer edge of the diaphragm is preferably reduced in thickness and is clamped be tween rings 14 of a resilient material such as rubber. Clamping ring 15 holds the rings 14 in position.
  • An acoustic diaphragm comprising a body portion of carbonized organic material coated with a material impervious to moisture.
  • An acoustic diaphragm comprising a body portion of carbonized cork coated with a material impervious to moisture.
  • An acoustic diaphragm comprising a 56 body portion of carbonized organic material covered with a coat of metal.

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

Description

Jan. 29, 1929.
1,700,530 N. H. HOLLAND ACOUSTIC DIAPHRAGM Filed June 12, 1926 ffiVfl/O/ lam/7dr; dim/00d Patented Jan. 29, 1929.
UNITED STATES PATENT OFFICE.
NEWMAN H. HOLLAND, F MONTGLAIR, NEW
JERSEY, ASSIGNOB TO BELL TELE- PHGNE LABORATORIES, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION 015 NEW YORK.
ACOUSEKC DIAPHRAGM.
This invention relates to acoustic diaphragms and more especially to such diaphragms for use in phonographs or loud speakers as sound radiators.
5, The object of this invention is to provide a diaphragm which has high elastic reactance and small mass and which can be economically produced.
' In accordance with this invention a diaphragm is produced by carbonizing a piece of organic material and then coating or plating it with a material impervious to moisture.
A preferred form of the invention is described hereinafter in connection with the atv tached drawings in which Fig. 1 is a front View of the diaphragm and Fig. 2 shows the diaphragm in section and mounted in a phonograph sound box. 0
Referring particularly to Fig. 2 the midportion 11 of the diaphragm is of cork or 7 other material which has been carbonized by the well known process of dry distillation so that only a cellular or honeycomb structure of carbon remains. This piece so treated is then coated with a thin film 12 of a substance which is moisture proof. Such a substance may be copper, aluminum or similar material and may be electrochemically deposited 4 or applied as a foil. It is essential that this coating be very thin so that the mass is not materially increased and although a metallic coating is not necessarily required it is preferred.
Especial care must be taken it a liquid coating is used since the liquid may penetrate slightly and also fill the holes left after carbonizing, thereby adding weight. At the same time, due to the penetration, there may not be a complete covering of the surface permitting absorption of moisture, which would 4,0 also increase the Weight. a
The outer edge of the diaphragm is preferably reduced in thickness and is clamped be tween rings 14 of a resilient material such as rubber. Clamping ring 15 holds the rings 14 in position.
What is claimed is:
. 1. An acoustic diaphragm comprising a body portion of carbonized organic material coated with a material impervious to moisture.
2. An acoustic diaphragm comprising a body portion of carbonized cork coated with a material impervious to moisture.
3. An acoustic diaphragm comprising a 56 body portion of carbonized organic material covered with a coat of metal.
In witness whereof I hereunto subscribe my name this 10th day of June A. D., 1926.
NEYVMAN H. HOLLAND.
US115471A 1926-06-12 1926-06-12 Acoustic diaphragm Expired - Lifetime US1700530A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US115471A US1700530A (en) 1926-06-12 1926-06-12 Acoustic diaphragm

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US1700530A true US1700530A (en) 1929-01-29

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4308094A (en) * 1977-02-02 1981-12-29 Sanyo Electric Co., Ltd. Diaphragm for speaker and method of producing same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4308094A (en) * 1977-02-02 1981-12-29 Sanyo Electric Co., Ltd. Diaphragm for speaker and method of producing same

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