US3722617A - Flat diaphragm for sound transducers - Google Patents

Flat diaphragm for sound transducers Download PDF

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Publication number
US3722617A
US3722617A US00258335A US3722617DA US3722617A US 3722617 A US3722617 A US 3722617A US 00258335 A US00258335 A US 00258335A US 3722617D A US3722617D A US 3722617DA US 3722617 A US3722617 A US 3722617A
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US
United States
Prior art keywords
diaphragm
channel member
electromagnetic assembly
vibration damping
band
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
US00258335A
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English (en)
Inventor
J Bertagni
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Individual
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Individual
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Filing date
Publication date
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Application granted granted Critical
Publication of US3722617A publication Critical patent/US3722617A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K13/00—Cones, diaphragms, or the like, for emitting or receiving sound in general
    • 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
    • H04R7/04—Plane diaphragms

Definitions

  • ABSTRACT Flat diaphragm for sound transducers having a flat front face and rear face defining a central figure portion connected to an electromagnetic assembly and surrounded by a marginal vibration damping portion of larger thickness than the adjacent peripheral zone of said figure portion, an endless channel member in said diaphragm, surrounding said figure portion to better acoustically separate said figure portion from said marginal vibration damping portion and if certain tones are to be emphasized a substantially straight metal band resting on said figure portion arranged between said electromagnetic assembly and said endless channel member.
  • Another object of the present invention is to provide in such an improved diaphragm.
  • a further'object of the invention isto provide in the linking zone 'of the electromagneticassembly with the rear face of said plate,-a pair of partial channel members enabling to house therein a portion of respective electric conductors which are connected to the electromagnetic assembly, to avoid that the material at the point of connection with the conductors may prematurely crack;
  • the presentinvention relates to improvements in a substantially flat diaphragm to be used in a sound transducer of the type having a flat front face and a rear face linked at one zone to an electromagnetic assembly in vibration transmitting relationship with said diaphragm, wherein said rear face forms part of a marginal vibration damping portion which substantially circumscribes a figure portion for transmitting the vibrations and to which at one zone said electromagnetic assembly is connected, the thickness of said marginal vibration damping portion is larger than the thickness of said figure portion adjacent said marginal vibration damping portion so that a lateral wall member is formed in between both and an endless channel member connecting said figure portion to said lateral wall member and defining a sudden change-in direction to increase the sound damping features and decrease the capability of sound generating vibration transmission into said marginal vibration damping portion.
  • FIG. 1 is a perspective viewof the diaphragm of the present invention showing the pertinent improvements.
  • FIG. 2 is a cross-section along line IIII of FIG. 1 and in addition the metal band is shown as housed in the pertinent recess.
  • FIGS. 3 and 4 are similar cross-sectional views as FIG. 2, but showing other alternative embodiments in relationship to the endless channel member the recess and metal band are not shown.
  • the flat diaphragm 1 of FIGS. I and 2 comprises a front face 2 which is flat and a rear facedefining a marginal vibration damping portion 3 which substantially circumscribes a figure portion 4 of a particular shape, similar to the pinna of a human ear.
  • the thickness of said figure portion 4, at least adjacent said marginal vibration damping zone 3 is smaller than the thickness of said damping zone 3 so that a side wall member 5 is formed in between both.
  • An endless channel member 6- connects said figure portion 4 to said side wall member 5 defining a sudden change in direction, to increase the damping or insulating feature and to decrease the vibration transmission feature, as to those vibrations which tend to enter into the marginal vibration damping portion 4.
  • These vibrations may be produced, for instance, at the electromagnetic assembly 7, which may also be a vibration collecting center if diaphragm l is used as a microphone instead of a loudspeaker. Since the electromagnetic assembly 7 as such does not form part of the present invention, it has merely been shown in a schematic manner in FIG. 1 and arrow 8 graphically indicates any type of means which links the electromagnetic assembly 7 and the figure portion 4, which to this end preferably includes a recess 9. Recess 9 is generally out of the geometric center of the figure portion 4.
  • the diaphragm should also include. means for emphasizing certain tones, such as for instance the high pitches, then in addition the figure portion 4 between the endless channel member 6 and the recess 9 has a channel 17, usually a straight channel, which links the recess 9 with the endless channel member 6.
  • Channel 17 has a bottom wall 17.
  • the metal band 18 is adhesively adhered to the bottom wall 17' of the channel 17.
  • the electromagnetic assembly 7 is provided with a pair of conductors l and 11 to be connected to the pertinent electric circuit. These conductors 10 and 11 are to be housed in the channel members 12, 13 formed in the figure portion 4 and which end in the recess 9. Thus it is avoided that the conductors l0 and 11 at their welding points with the electromagnetic assembly, may easily crack.
  • the endless channel member 6 may have several shapes, it being important that at the periphery 14 of the figure portion 4, the side wall 5 defines a sudden change in direction, to avoid that the vibrations which may for instance be produced at the electromagnetic assembly 7, continue their movement into the vibration damping portion 3. It is convenient that the bottom of the channel member 6 is near the front face 2.
  • channel member 6 is substantially V shaped.
  • channel member 6' has a polygonal cross-sectional area so that several sudden directional changes are achieved thereby.
  • the mould will have to include retractable members in order to be able to produce diaphragm 1 In the embodiment of FIG.
  • diaphragm 1 had a channel member 6" which is likewise V-shaped but where the arms 15" and 16" of the V define an almost straight angle.
  • the signal generated at the electromagnetic assembly 7 when the latter vibrates at a frequency corresponding to the length of the band 18 is directly transferred to the sembly of radial channels corresponds to the channel 17. Accordingly, if a loudspeaker assembly is specially used in order to achieve particular stereophonic effects and the channels 17 are arranged in this loudspeaker in different radial zones, any desired effect and shade may beobtained.
  • a substantially flat diaphragm to be used in a sound transducer having a flat front face and a rear face linked at one zone to an electromagnetic assembly formed in between both and an endless channel member connecting said figure portion to said lateral wall member and defining a sudden change in direction to increase the sound damping features and decrease the capability of sound generating vibration transmission into said marginal vibration damping portion.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
US00258335A 1971-06-08 1972-05-31 Flat diaphragm for sound transducers Expired - Lifetime US3722617A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AR23605971 1971-06-08
AR23606071 1971-06-08

Publications (1)

Publication Number Publication Date
US3722617A true US3722617A (en) 1973-03-27

Family

ID=25590907

Family Applications (1)

Application Number Title Priority Date Filing Date
US00258335A Expired - Lifetime US3722617A (en) 1971-06-08 1972-05-31 Flat diaphragm for sound transducers

Country Status (4)

Country Link
US (1) US3722617A (enrdf_load_stackoverflow)
DE (1) DE7221547U (enrdf_load_stackoverflow)
FR (1) FR2140579B3 (enrdf_load_stackoverflow)
GB (1) GB1369928A (enrdf_load_stackoverflow)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4003449A (en) * 1974-11-28 1977-01-18 Jose Juan Bertagni Planar diaphragm
US4318198A (en) * 1979-11-21 1982-03-09 Wollard Aircraft Equipment, Inc. Conveyance loader wheel position indicator
US4997058A (en) * 1989-10-02 1991-03-05 Bertagni Jose J Sound transducer
WO1995001080A1 (en) * 1993-06-17 1995-01-05 Bertagni Electronic Sound Transducers International Corporation Planar diaphragm loudspeaker with counteractive weights
US5425107A (en) * 1992-04-09 1995-06-13 Bertagni Electronic Sound Transducers, International Corporation Planar-type loudspeaker with dual density diaphragm
WO1996028949A1 (en) * 1995-03-16 1996-09-19 Transducer Valley Inc. Loudspeaker
US5693917A (en) * 1993-11-18 1997-12-02 Sound Advance Systems, Inc. Planar diaphragm loudspeaker
US5991424A (en) * 1995-04-28 1999-11-23 Sound Advance Systems, Inc. Planar diaphragm speaker with heat dissipator
US20040129492A1 (en) * 2002-10-28 2004-07-08 Alejandro Bertagni Planar diaphragm loudspeaker and related methods
US6904154B2 (en) 1995-09-02 2005-06-07 New Transducers Limited Acoustic device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015217778B4 (de) * 2015-09-17 2019-05-29 Robert Bosch Gmbh Akustischer Sensor mit einer Membran und einem elektroakustischen Wandler
GB2586959B (en) * 2019-08-08 2021-10-13 Amina Tech Limited Distributed mode loudspeaker

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4003449A (en) * 1974-11-28 1977-01-18 Jose Juan Bertagni Planar diaphragm
US4318198A (en) * 1979-11-21 1982-03-09 Wollard Aircraft Equipment, Inc. Conveyance loader wheel position indicator
US4997058A (en) * 1989-10-02 1991-03-05 Bertagni Jose J Sound transducer
US5425107A (en) * 1992-04-09 1995-06-13 Bertagni Electronic Sound Transducers, International Corporation Planar-type loudspeaker with dual density diaphragm
US5539835A (en) * 1992-04-09 1996-07-23 Sound Advance Systems, Inc. Planar-type loudspeaker with dual density diaphragm
US5615275A (en) * 1993-06-17 1997-03-25 Sound Advance Systems, Inc. Planar diaphragm loudspeaker with counteractive weights
WO1995001080A1 (en) * 1993-06-17 1995-01-05 Bertagni Electronic Sound Transducers International Corporation Planar diaphragm loudspeaker with counteractive weights
US5693917A (en) * 1993-11-18 1997-12-02 Sound Advance Systems, Inc. Planar diaphragm loudspeaker
WO1996028949A1 (en) * 1995-03-16 1996-09-19 Transducer Valley Inc. Loudspeaker
US5991424A (en) * 1995-04-28 1999-11-23 Sound Advance Systems, Inc. Planar diaphragm speaker with heat dissipator
US6904154B2 (en) 1995-09-02 2005-06-07 New Transducers Limited Acoustic device
US20050147273A1 (en) * 1995-09-02 2005-07-07 New Transducers Limited Acoustic device
US20060159293A1 (en) * 1995-09-02 2006-07-20 New Transducers Limited Acoustic device
US7158647B2 (en) 1995-09-02 2007-01-02 New Transducers Limited Acoustic device
US7194098B2 (en) 1995-09-02 2007-03-20 New Transducers Limited Acoustic device
US20040129492A1 (en) * 2002-10-28 2004-07-08 Alejandro Bertagni Planar diaphragm loudspeaker and related methods
US6929091B2 (en) 2002-10-28 2005-08-16 Sound Advance Systems, Inc. Planar diaphragm loudspeaker and related methods

Also Published As

Publication number Publication date
DE7221547U (de) 1972-09-07
GB1369928A (en) 1974-10-09
FR2140579A1 (enrdf_load_stackoverflow) 1973-01-19
FR2140579B3 (enrdf_load_stackoverflow) 1975-08-08

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