US1719472A - Acoustic diaphragm - Google Patents

Acoustic diaphragm Download PDF

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Publication number
US1719472A
US1719472A US115476A US11547626A US1719472A US 1719472 A US1719472 A US 1719472A US 115476 A US115476 A US 115476A US 11547626 A US11547626 A US 11547626A US 1719472 A US1719472 A US 1719472A
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United States
Prior art keywords
diaphragm
acoustic diaphragm
straw
convolutions
acoustic
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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
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US115476A
Inventor
Newman H Holland
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AT&T Corp
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Bell Telephone Laboratories Inc
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Publication date
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Priority to US115476A priority Critical patent/US1719472A/en
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Publication of US1719472A publication Critical patent/US1719472A/en
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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

  • FIG. 1 is a frontfiiew and Fig. 2 a view in partial section of the diaphragm mounted in a phonograph sound box. 7
  • one'end of apiece of light tubular material such as straw
  • a small spool-shaped piece 4 which may be of metal
  • the spirals may be made by any of the well known methods of coiling or bending tubular materials.
  • tubular straw When tubular straw is used it may be coiled by the method employed in making straw hats of similar material.
  • Tubular straw has the. advantage of lightness over metal tubes although itis more difficult to wind owing to the tendency of the straw to kink or collapse at intervals especially when the radius of the bend is small. However any kinks that occur do not noticeably affect the operation of the diaphragm.
  • a small amount of adhesive material such for example as a moisture proof element, is introduoed so that adjacent eonvolutions are held together.
  • the outside end of the tubular material may be tapered as shown at 5 either by cutting the end of the tube on the bias or collapsing it.
  • ⁇ Vhen appliedto a phonograph sound box the diaphragm is clamped between rings 6 of a resilient material such as rubber by a cap 7 which is attached to the main body 8 of the sound. box by means of a number of screws 9.
  • the pressure of the rings 6 on the diaphragm should only be suflicient to insure an air-tight joint.
  • the stylus arm 10 attached to spool 4 and pivotally supported at 11, has a needle 12 held therein which cooperates with a phonograph record, not shown. The vibrations of the record are transmitted to the diaphragm through the needle and stylus arm.
  • An acousticv diaphragm comprising a plurality of convolutions of a light tubular material.
  • An acoustic diaphragm comprising a plurality of convolutions of a tubular material, the adjacent convolutions being in contact.
  • An acoustic diaphragm comprising a plurality of convolutions'of straw.
  • An acoustic diaphragm comprising a plurality of convolutions'of straw, adjacent convolutions being held in contact by an adhesive substance.

Description

July 2, 1929. ND 1,719.472
ACOUSTIC DIAPHRAGM Filed June 12, 1926 Patented July 2, 1929.
UNITED STATES PATENT OFFICE.
NEWMAN H. HOLLANQ'OF MONTCLAIR, NEW .TERsEY, ASSIGNOR 'ro BELL TELEPHONE LABORATORIES, INCORPORATED, OF NEW YoEx, N.- Y., A CORPORATION OF NEW YORK. t
ACOUSTIC IJIAPIBIR AGIMI.
Application filed June 12, 1926. Serial No. 115,476.
by winding a light tubular material in the form of a flat spiral, the adjacent convolutions of which are held in contact by an ad-' hesive substance.
A preferred form of the invention is shown on. the attached drawing in which Fig. 1 is a frontfiiew and Fig. 2 a view in partial section of the diaphragm mounted in a phonograph sound box. 7
As illustrated, one'end of apiece of light tubular material, such as straw, is attached. to a small spool-shaped piece 4, which may be of metal, and is then wound in the form of a -fiat spiral substantially as shown. The spirals may be made by any of the well known methods of coiling or bending tubular materials. When tubular straw is used it may be coiled by the method employed in making straw hats of similar material. Tubular straw has the. advantage of lightness over metal tubes although itis more difficult to wind owing to the tendency of the straw to kink or collapse at intervals especially when the radius of the bend is small. However any kinks that occur do not noticeably affect the operation of the diaphragm. During the winding process a small amount of adhesive material, such for example as a moisture proof element, is introduoed so that adjacent eonvolutions are held together. The outside end of the tubular material may be tapered as shown at 5 either by cutting the end of the tube on the bias or collapsing it.
\Vhen appliedto a phonograph sound box the diaphragm is clamped between rings 6 of a resilient material such as rubber by a cap 7 which is attached to the main body 8 of the sound. box by means of a number of screws 9. The pressure of the rings 6 on the diaphragm should only be suflicient to insure an air-tight joint.
The stylus arm 10, attached to spool 4 and pivotally supported at 11, has a needle 12 held therein which cooperates with a phonograph record, not shown. The vibrations of the record are transmitted to the diaphragm through the needle and stylus arm.
\Vhat is claimed is:
1. An acoustic diaphragm light. tubular material woun in a spiral. r a
2. An acousticv diaphragm comprising a plurality of convolutions of a light tubular material. I
'3. An acoustic diaphragm comprising a plurality of convolutions of a tubular material, the adjacent convolutions being in contact. I
4. An acoustic diaphragm comprising a plurality of convolutions'of straw.
5. An acoustic diaphragm comprising a plurality of convolutions'of straw, adjacent convolutions being held in contact by an adhesive substance. Y
In witness whereof, I hereunto subscribe my name this 10th day of June A. D., 1926.
NEWMAN H. HOLLAND.
comprising the form of
US115476A 1926-06-12 1926-06-12 Acoustic diaphragm Expired - Lifetime US1719472A (en)

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US115476A US1719472A (en) 1926-06-12 1926-06-12 Acoustic diaphragm

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US1719472A true US1719472A (en) 1929-07-02

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3076062A (en) * 1959-10-30 1963-01-29 Dyna Magnetic Devices Inc Hearing-aid sound transducer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3076062A (en) * 1959-10-30 1963-01-29 Dyna Magnetic Devices Inc Hearing-aid sound transducer

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