US1877804A - Diaphragm or diaphragm mount for loudspeakers or other sound reproducing devices - Google Patents

Diaphragm or diaphragm mount for loudspeakers or other sound reproducing devices Download PDF

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Publication number
US1877804A
US1877804A US205936A US20593627A US1877804A US 1877804 A US1877804 A US 1877804A US 205936 A US205936 A US 205936A US 20593627 A US20593627 A US 20593627A US 1877804 A US1877804 A US 1877804A
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US
United States
Prior art keywords
diaphragm
loudspeakers
edge
sound reproducing
mount
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
US205936A
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English (en)
Inventor
Bruijnes Johannes
Arend Thomas Van Urk
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.)
RCA Corp
Original Assignee
RCA Corp
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
Priority claimed from GB2530426A external-priority patent/GB280013A/en
Application filed by RCA Corp filed Critical RCA Corp
Application granted granted Critical
Publication of US1877804A publication Critical patent/US1877804A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H04R7/16—Mounting or tensioning of diaphragms or cones
    • H04R7/18—Mounting or tensioning of diaphragms or cones at the periphery
    • H04R7/20—Securing diaphragm or cone resiliently to support by flexible material, springs, cords, or strands

Definitions

  • This invention relates to loudspeakers or like apparatus provided with diaphragms or vibrating members which are supported at their edge for example by baflle.
  • plates or The term baffle plate must be understood to mean a plate which surrounds the edge of the diaphragm or vibrating member so that the free air path between the front and rear sides of the said diaphragm is lengthm ened.
  • the edge of the diaphragm should be secured to the plate in such a manner that the diaphragm is free to move without air streaming between the diaphragm and the baffle plate. Due to this air stream, rarefactions and compressions which are caused by the vibrating movement of the diaphragm, will weaken one another, and therefore low tones will disappear from the sound of the loudspeaker and a faithful reproduction is impossible.
  • the diaphragm and the baflle plate are secured to each other by means of a yieldin substance which is fixed to the edge of the diaphragm and to the baffle plate. Besides the difiiculties met with in the manufacture of this construction it also has the disadvantage in that a rustling noise is produced. This noise is caused by the yielding substance moving together with the diaphragm whereby it is bent and produces sound.
  • the edge of the diaphragm or vibrating member is located between strips of a yielding substance, said strips being secured to a rigid support or to a battle plate.
  • the diaphragm is not secured to these strips but is loosely located between them.
  • the strips are made of textile fabric, preferably of woolen fabric such as flannel or serge, since these substances have the ad vantage of being very supple so that the crackling noise which frequently occurs when leather is used, is not produced.
  • a conical diaphragm has been provided, the edge of which is provided with a collar located between strips of woolen fabric.
  • the conical member is made of celluloid, which in combination with the above mentioned special support enables the manufacturer to build a very cheap, reliable and solid sound reproducing device.
  • FIG. 1 is a front view of a loud-speaker provided with a baffle plate having secured 7
  • 1 is a conical vibrating member which is set in vibration by a style 2 which may be coupled to a magnet system.
  • the cone 1 is provided with a ring or collar 8located between flannel strips 3 and 4 which by means of clamping rings 5 and 6 are secured to a baffle plate 7.
  • the construction which is more clearly shown in Figure 3, serves to support the edge of the cone in such a manner that the latter is free to move and practically no air can stream from the fore to the rearside of the vibrating member.
  • the strips preferably are flannel inasmuch as woolen fabrics are very supple and assure a satisfactory obturation.
  • a loud speaker comprising a vibrating member, a stationary member, and fabric strips each fastened at an edge only to one of said members and loosely in contact at their free portions with opposite sides of the other member.
  • An acoustic device comprising a vibratile member, a stationary member having an edge portion adjacent to the periphery of said vibratile member but out of contact therewith,
  • each of said flat yieldable members being fastened to said edge portion so that a part thereof extends freely beyond said edge portion to loosely engage said vibratile member near its periphery.
  • An acoustic device in which said vibratile member consists of a conical diaphmgm provided at its edge with a collar which is positioned between said pair of flat yieldable members.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
US205936A 1926-09-13 1927-07-15 Diaphragm or diaphragm mount for loudspeakers or other sound reproducing devices Expired - Lifetime US1877804A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1877804X 1926-09-13
GB2530426A GB280013A (en) 1926-10-11 1926-10-11 Improvements in or relating to diaphragms or diaphragm mounts for loud speakers or other sound reproducing devices

Publications (1)

Publication Number Publication Date
US1877804A true US1877804A (en) 1932-09-20

Family

ID=26257607

Family Applications (1)

Application Number Title Priority Date Filing Date
US205936A Expired - Lifetime US1877804A (en) 1926-09-13 1927-07-15 Diaphragm or diaphragm mount for loudspeakers or other sound reproducing devices

Country Status (3)

Country Link
US (1) US1877804A (enrdf_load_stackoverflow)
BE (1) BE343810A (enrdf_load_stackoverflow)
FR (1) FR638593A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106460827A (zh) * 2014-05-29 2017-02-22 查莱斯奥斯藤泵有限公司 旋转泵

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106460827A (zh) * 2014-05-29 2017-02-22 查莱斯奥斯藤泵有限公司 旋转泵
US20170198686A1 (en) * 2014-05-29 2017-07-13 Charles Austen Pumps Ltd. A rotary pump
US10371138B2 (en) * 2014-05-29 2019-08-06 Charles Austen Pumps Ltd. Rotary pump

Also Published As

Publication number Publication date
BE343810A (enrdf_load_stackoverflow)
FR638593A (fr) 1928-05-29

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