US1873335A - Diaphragm for sound receiving, reproducing, amplifying, and transmitting instruments - Google Patents

Diaphragm for sound receiving, reproducing, amplifying, and transmitting instruments Download PDF

Info

Publication number
US1873335A
US1873335A US481031A US48103130A US1873335A US 1873335 A US1873335 A US 1873335A US 481031 A US481031 A US 481031A US 48103130 A US48103130 A US 48103130A US 1873335 A US1873335 A US 1873335A
Authority
US
United States
Prior art keywords
diaphragm
reproducing
sound receiving
amplifying
strips
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
US481031A
Inventor
Schmidt Hans
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of US1873335A publication Critical patent/US1873335A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • H04R7/12—Non-planar diaphragms or cones

Definitions

  • Diaphragms used in sound receiving, reproducing amplilying and transmitting apparatus which I will refer to generally as acoustic diaphragms, constructed solely of paper or some such material, have the defect that the vibration thereof does not proceed solely in the direction of the impulse producing it, but also in transverse directions, and this produces impure or distorted acoustic effects.
  • the diaphragm of a very thin sheet, e. g. of paper, with strips stuck thereto side by side, the strips consisting of fibrous vegetable material of a kind in which the fibres enclose pith, and the fibres extending longitudinally of the strips, from the part where the impulse is applied substantially in the direction in which the vibration is to be propagated.
  • Plant stalks e. g. straw stalks, are suitable for this purpose, the same being flattened by suitable means. I may for example slit the stalks, heat them by means of steam, and flatten them by pressing, ironing or other convenient means.
  • FIG. 1 is a plan view of the blank partially formed.
  • Fig. 2 is a side elevation of the diaphragm.
  • the diaphragm shown comprises a thin sheet a of paper of coned shape, truncated so that there is a hole b at the apex. To this sheet are stuck sector shaped strips 0 of flattened straw.
  • Straw is a very light material, with a high degree of internal damping, due largely to the loose textured pith and its dense fibrous structure enables it to transmit even minute mechanical vibrations in the direction in which it is layed.
  • the invention is applicable to acoustic diaphragms for all purposes, including dia-- phragms for loud-speakers.
  • the soundreproduction obtained is exceedingly true, over a very wide range of notes, including the over-tones.
  • An acoustic diaphragm consisting of a thin sheet and flattened straw-stalks stuck side by side to saidshcet, the fibres of the stalks extending substantially in the direction in which the vibration is to be transmitted.
  • An acoustic diaphragm consisting of a thin sheet and strips of fibrous material stuck" side by side to said sheet, the fibres extending substantially in the direction in which the vibration. is to be transmitted, said strips cons sting of straw stalks slit open, steamed and flattened.
  • An acoustic diaphragm consisting of a thin'sheet of conical shape, and strips stuck side by side to said sheet, the strips consisting of fibrous vegetable material and having an inside layer of pith, and extending in the direction in which the vibration is to be transmitted.
  • An acoustic diaphragm consisting of a thin sheet of conical shape and strips stuck side by side to said sheet, said strips consist ing of fibrous vegetable material composed of a layer of fibres and a layer of pith upon said fibres, and said fibres extending in the direction in which the vibration is to be transmitted.
  • An acoustic diaphragm consisting of a thin sheet of conical shape and sector shaped strips stuck side by side to said sheet, extending from the center thereof to the circumference, said strips consisting of fibrous vegetable material composed of a. layer of fibres and a layer of pith upon said fibres.

Description

Aug. 23, 1932. -r 1,873,335
DIAPHRAGI FOR SOUND RECEIVING, REPRODUCING,
ANPLIFYING AND TRANSMITTING INSTRUMENTS Filed Sept. 10. 1930 INVENTo HANS. SCHMIDT.
ATTORNEY.
Patented Aug. 23, 1932 UNITED STATES HANS SCHMIDT, OF JENA, GERMANY DIAPHRAGM FOR SOUND RECEIVING, BEPRODUCING, AMPLIFYING, AND TRANSMIT- TING INSTRUMENTS Application filed September 10, 1980, Serial No. 481,031, and in Germany October 15, 1929.
Diaphragms used in sound receiving, reproducing amplilying and transmitting apparatus, which I will refer to generally as acoustic diaphragms, constructed solely of paper or some such material, have the defect that the vibration thereof does not proceed solely in the direction of the impulse producing it, but also in transverse directions, and this produces impure or distorted acoustic effects.
According to my invention, which relates to coned diaphragms, this defect is overcome by constructing the diaphragm of a very thin sheet, e. g. of paper, with strips stuck thereto side by side, the strips consisting of fibrous vegetable material of a kind in which the fibres enclose pith, and the fibres extending longitudinally of the strips, from the part where the impulse is applied substantially in the direction in which the vibration is to be propagated. Plant stalks, e. g. straw stalks, are suitable for this purpose, the same being flattened by suitable means. I may for example slit the stalks, heat them by means of steam, and flatten them by pressing, ironing or other convenient means.
An example is illustrated in the accompanying drawing in which Fig. 1 is a plan view of the blank partially formed.
Fig. 2 is a side elevation of the diaphragm.
The diaphragm shown comprises a thin sheet a of paper of coned shape, truncated so that there is a hole b at the apex. To this sheet are stuck sector shaped strips 0 of flattened straw.
Straw is a very light material, with a high degree of internal damping, due largely to the loose textured pith and its dense fibrous structure enables it to transmit even minute mechanical vibrations in the direction in which it is layed.
The invention is applicable to acoustic diaphragms for all purposes, including dia-- phragms for loud-speakers. The soundreproduction obtained is exceedingly true, over a very wide range of notes, including the over-tones.
WVhat I claim as my invention and desire to secure by Letters Patent of the United States 1s:
1. An acoustic diaphragm consisting of a thin sheet and flattened straw-stalks stuck side by side to saidshcet, the fibres of the stalks extending substantially in the direction in which the vibration is to be transmitted.
' 2. An acoustic diaphragm consisting of a thin sheet and strips of fibrous material stuck" side by side to said sheet, the fibres extending substantially in the direction in which the vibration. is to be transmitted, said strips cons sting of straw stalks slit open, steamed and flattened.
3. An acoustic diaphragm consisting of a thin'sheet of conical shape, and strips stuck side by side to said sheet, the strips consisting of fibrous vegetable material and having an inside layer of pith, and extending in the direction in which the vibration is to be transmitted.
4. An acoustic diaphragm consisting of a thin sheet of conical shape and strips stuck side by side to said sheet, said strips consist ing of fibrous vegetable material composed of a layer of fibres and a layer of pith upon said fibres, and said fibres extending in the direction in which the vibration is to be transmitted.
5. An acoustic diaphragm consisting of a thin sheet of conical shape and sector shaped strips stuck side by side to said sheet, extending from the center thereof to the circumference, said strips consisting of fibrous vegetable material composed of a. layer of fibres and a layer of pith upon said fibres.
' HANS SCHMIDT.
US481031A 1929-10-15 1930-09-10 Diaphragm for sound receiving, reproducing, amplifying, and transmitting instruments Expired - Lifetime US1873335A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE352798X 1929-10-15

Publications (1)

Publication Number Publication Date
US1873335A true US1873335A (en) 1932-08-23

Family

ID=6277679

Family Applications (1)

Application Number Title Priority Date Filing Date
US481031A Expired - Lifetime US1873335A (en) 1929-10-15 1930-09-10 Diaphragm for sound receiving, reproducing, amplifying, and transmitting instruments

Country Status (2)

Country Link
US (1) US1873335A (en)
GB (1) GB352798A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2624417A (en) * 1947-02-20 1953-01-06 Joseph B Brennan Acoustic diaphragm with flexible rim portion and rigid body portion

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2624417A (en) * 1947-02-20 1953-01-06 Joseph B Brennan Acoustic diaphragm with flexible rim portion and rigid body portion

Also Published As

Publication number Publication date
GB352798A (en) 1931-07-16

Similar Documents

Publication Publication Date Title
US1873335A (en) Diaphragm for sound receiving, reproducing, amplifying, and transmitting instruments
GB405613A (en) Improvements in and relating to the directive discrimination of sound beams
US1744032A (en) Diaphragm
US1856791A (en) Vibrator for loud speakers
US1722485A (en) Sound-reproducing device and method for making same
US1708943A (en) Acoustic device
US1828513A (en) Sound reproducer
GB231421A (en) Improvements in sound-reproducing apparatus
US1381430A (en) Amplifier for phonographs and the like
US1723550A (en) Sound-producing diaphragm
US1666226A (en) Musical instrument
US1814603A (en) Art of the transmission of sound waves
US1118345A (en) Sound-box for talking-machines.
US953889A (en) Diaphragm.
US1735905A (en) Microphone mounting
US1692868A (en) Acoustical apparatus for telephonic communication
US1763055A (en) Loud-speaker
US1552631A (en) Sound amplifier
US1369795A (en) Sound-box
US1931886A (en) Acoustic apparatus
US1271529A (en) Acoustic device.
US1722656A (en) Duplex motive transmission for vibratory elements
US1653159A (en) Badiorepbodtjcer
US1809314A (en) Sound amplifying device
SU29049A1 (en) Sound Amplifier for Hearing Aid