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US1689030A - Acoustic diaphragm - Google Patents

Acoustic diaphragm Download PDF

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Publication number
US1689030A
US1689030A US115472A US11547226A US1689030A US 1689030 A US1689030 A US 1689030A US 115472 A US115472 A US 115472A US 11547226 A US11547226 A US 11547226A US 1689030 A US1689030 A US 1689030A
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US
United States
Prior art keywords
diaphragm
acoustic diaphragm
metals
acoustic
porous
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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
US115472A
Inventor
Newman H Holland
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.)
AT&T Corp
Original Assignee
Bell Telephone Laboratories Inc
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 Bell Telephone Laboratories Inc filed Critical Bell Telephone Laboratories Inc
Priority to US115472A priority Critical patent/US1689030A/en
Application granted granted Critical
Publication of US1689030A publication Critical patent/US1689030A/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

Definitions

  • NEWMAN H. HOLLAND OF MONTCLAIR, NEW JERSEY, ASSIGNOR T BELL TELEPHONE LABORATORIES, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.
  • This invention relates to acoustic diaphragms and more especially to such (liaphragms 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 is strong and can be produced economically.
  • such a diaphragm is attained by utilizing a substance Which is intrinsically strong, impervious to moisture and has a large number of holes, voids or cells distributed substantiallly uniformly throughout the structure.
  • Fig. 1 is a front View of a diaphragm in accordance with this invention and Fig. 2 shows the diaphragm in section mounted in a phonograph sound box.
  • the drawing illustrates a diaphragm 13 made from one of the so-called prepared porous metals.
  • the pores or holes 14 are not uniform in size but are substantially evenly distributed.
  • Porous metals are made in a variety of Ways. Basically, however, the methods consist in mixing two or more metals and then removing one or more of them by differential chemical, mechanical, electrical or electrochemical process. The various methods are diiferentiated by the manner of removing the metals not wanted, and'form no part of this invention.
  • the strength and elasticity of the diaphragm will depend uponthe metal or metals of which it is made and its mass will be small as compared with a non-porous piece of the same size. 4
  • spongy celluloid which is ordinary celluloid treated to make it porous.
  • This material may be produced by the process, for example, disclosed in Austrian Patent 8,607, October 8, 1913, which is an addition to No. 63,556. See also U. S. Patent 1,142,619 to G. Film and A. Glaessner.
  • the outer edge of the diaphragm is pref- 0 erably reduced in thickness and is clamped between rings 15 of a resilient material such as rubber.
  • a clamping ring 16 holds the rings 15 in position. 7
  • An acoustic diaphragm comprising a thin metallic disc of porous construction.

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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

Oct. 23, 1928. N. H. HOLLAND ACOUSTIC DIAPHRAGM Filed June 12, 1926 Patented Oct. 23, 1928 UNITED STATES PATENT OFFICE.
NEWMAN H. HOLLAND, OF MONTCLAIR, NEW JERSEY, ASSIGNOR T BELL TELEPHONE LABORATORIES, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.
ACOUSTIC DIAPHRAGM.
Application filed June 12, 1926 Serial No. 115,472.
This invention relates to acoustic diaphragms and more especially to such (liaphragms 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 is strong and can be produced economically.
' In accordance with this invention such a diaphragm is attained by utilizing a substance Which is intrinsically strong, impervious to moisture and has a large number of holes, voids or cells distributed substantiallly uniformly throughout the structure.
.The invention will be better understood from the following description in connection with the attached drawing in which Fig. 1 is a front View of a diaphragm in accordance with this invention and Fig. 2 shows the diaphragm in section mounted in a phonograph sound box.
The drawing illustrates a diaphragm 13 made from one of the so-called prepared porous metals. The pores or holes 14 are not uniform in size but are substantially evenly distributed.
Porous metals are made in a variety of Ways. Basically, however, the methods consist in mixing two or more metals and then removing one or more of them by differential chemical, mechanical, electrical or electrochemical process. The various methods are diiferentiated by the manner of removing the metals not wanted, and'form no part of this invention.
The strength and elasticity of the diaphragm will depend uponthe metal or metals of which it is made and its mass will be small as compared with a non-porous piece of the same size. 4
Another material which may be used for diaphragms in accordance with this invention is what is known as spongy celluloid, which is ordinary celluloid treated to make it porous. This material may be produced by the process, for example, disclosed in Austrian Patent 8,607, October 8, 1913, which is an addition to No. 63,556. See also U. S. Patent 1,142,619 to G. Film and A. Glaessner.
The outer edge of the diaphragm is pref- 0 erably reduced in thickness and is clamped between rings 15 of a resilient material such as rubber. A clamping ring 16 holds the rings 15 in position. 7
What is claimed is: An acoustic diaphragm comprising a thin metallic disc of porous construction.
In witness whereof, I hereunto subsu-ibe my name this 10th day of June, A. D., 1926.
NEWMAN H. HOLLAND.
US115472A 1926-06-12 1926-06-12 Acoustic diaphragm Expired - Lifetime US1689030A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2462045A (en) * 1942-04-04 1949-02-15 Wulff John Method of producing filters
US2486436A (en) * 1946-05-10 1949-11-01 Rothstein Jerome Contamination control
US2696434A (en) * 1947-10-02 1954-12-07 Thompson Prod Inc Process of producing cylinder sleeves

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2462045A (en) * 1942-04-04 1949-02-15 Wulff John Method of producing filters
US2486436A (en) * 1946-05-10 1949-11-01 Rothstein Jerome Contamination control
US2696434A (en) * 1947-10-02 1954-12-07 Thompson Prod Inc Process of producing cylinder sleeves

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