US1808238A - Diaphragm for sound reproduction - Google Patents

Diaphragm for sound reproduction Download PDF

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Publication number
US1808238A
US1808238A US302466A US30246628A US1808238A US 1808238 A US1808238 A US 1808238A US 302466 A US302466 A US 302466A US 30246628 A US30246628 A US 30246628A US 1808238 A US1808238 A US 1808238A
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US
United States
Prior art keywords
diaphragm
box frame
diaphragms
sound
straight
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
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US302466A
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English (en)
Inventor
Locke Karl
Sachs Hugo
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Individual
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Individual
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Publication date
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Publication of US1808238A publication Critical patent/US1808238A/en
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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
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12—Non-planar diaphragms or cones

Definitions

  • This invention relates to a sound-reproducing diaphragm for loud speakers, talking machines or the like, in which curved strip-like or plate-shaped oscillating bodies ⁇ E are employed.
  • Sound-reproducing diaphragms of this type are already known, the oscillations being transmitted, tangentially to the surface, to the marginal rim of one or more 1 arcuate diaphragms.
  • Such diaphragms are attended with the drawback that the actuated marginal rim describes the most powerful oscillations, whilst the oscillations become progressively weaker towards the point of support of the diaphragm.
  • a plurality of such oscillating bodies may be disposed side by side or one within another.
  • the arrangement may also be such that the oscillatory oppositely acting surfaces encounter an interposed column of air interposed between them, which is suitably loosely coupled to the atmosphere, an arrangement which ensures very good reproduction of low frequencies.
  • the arrangement also enables very large surfaces-for example of several thousand square centimetres-to be set in oscillation with a small amount of energy, thereby ensuring reproduction over a very wide range of frequencles.
  • Fig. 1 shows a simple bent oscillating body which is suitably fixed to a support at one side, and is actuated in the direction of the 302,466, and in Austria. February 2, 1928.
  • Fig. 2 represents a bent surface, which may, of course also consist of two individual surfaces; and the surface or surfaces may be constructed of a plurality of strips or the like. In this case also, the oscillations are transmitted to the diaphragm in the direction of the chord of the arc.
  • oscillating bodies may be combined to form a reproducing diaphragm, as shown in Fig. 3.
  • the individual. oscillating bodies may also be made of different dimensions, in order to enable them to deal with different ranges of tones.
  • Fig. 4 is a diagrammatic representation of a diaphragm according to the invention, applied to a talking machine and actuated by a sound record disc and needle.
  • the oscillating body 0 is actuated by the needle holder a.
  • the sound record is directed parallel to the surface of the sound record disc.
  • Fig. 5 shows a side elevation of a typical arrangement applied to a talking machine, in which the sound record is directed at right angles to the surface of the record disc; and Fig. 6 is a front elevation of this arrangement.
  • the oscillating body or diaphragm c is preferably fixed into the top of a frame, and carries the needle holder at on its lower end, said holder running on the record 6 and moving up and down.
  • Fig. 7 is a side elevation
  • Fig. 8 a front elevation of a typical loud speaker, the diaphragms in this case being connected by one straight border to the armature of the electro-magnetic operating means f, and secured at the lower opposite straight border to the frame 9 of the box, which latter may be covered in known manner with two coverings of stretched fabric or otherwise, permittlng passage of sound.
  • the diaphragms have their convex surfaces mutually oppositely and outwardly directed and are integrally united at their free border which is acted upon by the electro-magnetic means f.
  • an open sided rectangular box frame a pair of straight-bordered curved diaphragms Within said box frame arranged with their convex surfaces mutually oppositely and outwardly directed and each secured by one stralght border to one side of said box frame, and
  • an o'pen sided rectangular box frame a straight-bordered curved diaphragm of a size exceeding 2000 square centimetres Within said box frame and secured by one-straight border to oneside thereof, and means mounted on said box frame for vibrating the opposite straight border of said diaphragm in the direction of the chord of the curvature of said diaphragm.
  • a pair of straight-bordered curved diaphragms each of a size exceeding 2000 square centimetres Within said box frame arranged With their convex -surfaces mutually oppositely and out- 'W'ardly directed and each secured by one stralght border to one side of said box frame,

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
US302466A 1928-02-02 1928-08-28 Diaphragm for sound reproduction Expired - Lifetime US1808238A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT1808238X 1928-02-02

Publications (1)

Publication Number Publication Date
US1808238A true US1808238A (en) 1931-06-02

Family

ID=3689007

Family Applications (1)

Application Number Title Priority Date Filing Date
US302466A Expired - Lifetime US1808238A (en) 1928-02-02 1928-08-28 Diaphragm for sound reproduction

Country Status (3)

Country Link
US (1) US1808238A (en:Method)
BE (1) BE349785A (en:Method)
GB (1) GB311461A (en:Method)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110232990A1 (en) * 2009-12-25 2011-09-29 Pioneer Corporation Vibrating body for speaker and speaker device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110232990A1 (en) * 2009-12-25 2011-09-29 Pioneer Corporation Vibrating body for speaker and speaker device
US8235167B2 (en) * 2009-12-25 2012-08-07 Pioneer Corporation Vibrating body for speaker and speaker device

Also Published As

Publication number Publication date
GB311461A (en) 1929-05-13
BE349785A (en:Method)

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