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WO2002056636A2 - Transducteur acoustique - Google Patents

Transducteur acoustique Download PDF

Info

Publication number
WO2002056636A2
WO2002056636A2 PCT/US2002/001319 US0201319W WO02056636A2 WO 2002056636 A2 WO2002056636 A2 WO 2002056636A2 US 0201319 W US0201319 W US 0201319W WO 02056636 A2 WO02056636 A2 WO 02056636A2
Authority
WO
WIPO (PCT)
Prior art keywords
diaphragm
magnets
voice coil
audio transducer
transducer
Prior art date
Application number
PCT/US2002/001319
Other languages
English (en)
Other versions
WO2002056636A3 (fr
Inventor
Paul W. Paddock
Original Assignee
Paddock Paul W
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 Paddock Paul W filed Critical Paddock Paul W
Priority to AU2002248359A priority Critical patent/AU2002248359A1/en
Publication of WO2002056636A2 publication Critical patent/WO2002056636A2/fr
Publication of WO2002056636A3 publication Critical patent/WO2002056636A3/fr
Priority to US10/909,231 priority patent/US20050152575A1/en

Links

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 is related to audio transducers, and in particular to a novel audio transducer design that exhibits unusually good efficiency, frequency response, and accuracy.
  • An object of this invention is to provide an improved transducer featuring a construction which overcomes the difficulties and shortcomings indicated.
  • an object of the invention is to provide a transducer with an
  • Another object of the invention is to . provide a high performance transducer that may be inexpensively manufactured, having a small number of parts and requiring few complex manufacturing processes.
  • a further object of the invention is to provide a transducer having a rigid moving mass of reduced weight.
  • Yet another object of the invention is to provide a transducer wherein the diaphragm may be easily and precisely aligned within the magnet gap to safely permit a narrowed magnet gap such that the alignment remains fixed over use and time.
  • a further object of the invention is to provide a transducer having a diaphragm alignment system that distributes suspension forces equally along the length of the diaphragm.
  • a further object of the invention is to provide a transducer with a diaphragm constructed from a material that has a high strength-to-weight ratio, is resistant to solvents and acids, which resists degradation on exposure to ultraviolet radiation, which has a surface that is compatible with a wide variety of standard adhesives, and which is highly thermally transmissive without warpage at high temperatures and temperature differentials.
  • the present invention is embodied in an audio transducer that exhibits excellent audio characteristics.
  • the present invention includes a single, curved planar diaphragm that is mounted at its driven end between a pair of spaced-apart magnets.
  • the diaphragm is curved in an asymmetric shape similar to that of a curved resilient spring, i.e. a cross-sectional view of the diaphragm shows the edge of the diaphragm as a sort of spiral where the radius of curvature increases continually along the length of the diaphragm.
  • FIG. 1 is a perspective view of a diaphragm according to a preferred embodiment of the invention.
  • FIG. 2 is a top schematic view of a preferred embodiment of the invention showing the arrangement of the diaphragm and the magnets.
  • FIG. 3 is a top schematic view of a preferred embodiment of the invention showing the arrangement of the diaphragm and the magnets, and also showing the optimal radiating angles.
  • FIG. 4 is a cross-sectional view of the magnets comprising the linear drivers in a preferred embodiment.
  • FIG. 5 is a top schematic view of the embodiment shown in FIG. 2, and showing the suspension and centering apparatus.
  • FIG. 6 is a side cross sectional view of the suspension and centering system.
  • FIG. 7 is a side view of the diaphragm showing the diaphragm with the attached voice coil and the damping strips that in this instance, extend to near the distal end of the diaphragm.
  • FIG. 8 is a top view of the mounting plate showing the tube stays.
  • FIG. 9 is a top view of the mounting plate shown in FIG. 8 and also showing the magnet assemblies and diaphragms mounted therein, and in particular showing the distal end of the diaphragm adhered to one of the tube stays by means of two sided tape.
  • the audio transducer includes a curved diaphragm 12 having a driven end 14 and a dampened end 16.
  • the diaphragm 12 can be thought of as a rectangular planar member with the driven end 14 mounted between a pair of spaced-apart magnets 18 and 20 that in part form the driver.
  • a flat, rectangular voice coil 15 is mounted on the driven end 14, and is either adhered or mechanically attached to the driven end 14 of the diaphragm to form the diaphragm assembly 17. (See Fig 2).
  • the voice coil 1 5 and driven end 14 are suspended within the magnetic gap in such a manner that a back and forth motion is initiated in step with an applied audio voltage.
  • the driver includes magnets 18 and 20 that extend along and are co-extensive with the driven end 12 of diaphragm assembly 1 7.
  • This structure is referred to as a "linear driver", and was described in detail in my earlier patent US 5,320,021, the specification of which is hereby incorporated by reference.
  • the magnet gap should be as narrow as possible while allowing sufficient clearance to permit passage of a planar diaphragm 46 as will be discussed below.
  • the ideal gap width varies depending on the size of the transducer and application being fulfilled.
  • the magnet gap 40 may range between 0.020 and 0.062 inch, with a spacing of inch being preferred in the particular high frequency transducer 20 illustrated.
  • each magnet assembly 36, 38 comprises a magnetic core, 48, 50, respectively, with a pair of rigid, ferro-magnetic metal pole plates 52 affixed to the opposite sides of each magnetic core.
  • the pole plates 52 are generally coextensive with the magnetic cores 48, 50, extending slightly beyond the magnetic cores in the direction of the magnet gap 40 so that the separation between opposed pole plates 52 defines the magnet gap.
  • the magnetic cores 52 are magnetically oriented so that each pole plate is of opposite magnetic polarity from the other pole plate attached to the same magnetic core and so that each pole plate 52 is also magnetically opposite from its counterpart across the magnet gap 40.
  • the diaphragm assembly is mounted and centered in the driver assembly as follows.
  • the end portion of the diaphragm includes damping strips adhered thereto.
  • a series of holes are drilled or stamped in their predetermined locations to align with the centering tabs as shown in FIG. 6.
  • the holes are sized to allow reliable registry with and entry of the pointed tabs and adhering thereto.
  • the voice coil is wound of wire as previously described on an aluminum foil strip. This assembly is laminated to the plastic diaphragm between the two strips of vertical holes. The damping strips are provided to control unwanted oscillation of the diaphragm.
  • the diaphragm is centered by means of a suspension centering system that functions as follows.
  • the centering tabs are aligned vertically along one side of the front and back of the magnet structure only.
  • the tabs are tapered to a point to allow them to enter the matching holes in the diaphragm.
  • the tabs are affixed by glue so that the diaphragm is centered in relation to the magnetic gap.
  • the vertical strips of foam tape spaces the tabs away from the magnetic structure allowing free lateral motion of the diaphragm into and out of the magnetic gap.
  • the tabs could be cast in a comb like structure as well.
  • the foam tape is a commercially available double sided tape of cellulose urethane.
  • the tabs can be formed of any of a number of flexible films or papers, and none in particular demonstrates any clearly superior performance. Elongation of the tabs is not required, eliminating an onerous problem often encountered in manufacturing. The amount of tabs, their spacing, the amount of free length, their shape can be determined to most readily accommodate ease of manufacture.
  • the diaphragm 12 extends from between the magnets and curves asymmetrically to position the opposite dampened end 16 of the diaphragm to the side and behind the magnets and driven end 12.
  • the curvature of the diaphragm was determined experientially to yield the broadest, flattest frequency response.
  • the curvature is that of a tensioned spring, and which can be generally described as having an initial radius adjacent to the driven end 14, and in which the radius increases along the curvature of the diaphragm to its dampened end.
  • the dampened end 16 of diaphragm 12 is mounted in the frame assembly
  • a frame includes top and bottom members that are shaped in the same general shape as the diaphragm, only larger.
  • the frame members are slotted to receive the magnetic blocks, and are spaced apart by 2 or three vertical members, allowing for as much open frame width as possible. Holes are let into the plates' central to the tube stays to allow vertical stacking of multiple transducers into a large assembly using a long threaded rod.
  • an audio signal is applied to the linear driver in a conventional fashion.
  • the voice coil 15 is oscillated back and forth in the magnetic gap of the linear driver, vibrating the diaphragm driven end 14. This physical motion travels through the diaphragm and expends some of its energy as sound.
  • the primary radiation area is across an angle extending from a plane tangent to the magnet structure to about 90 degrees to 120 degrees. (See Fig. 4).
  • the device maintains its flat power output over this broad angle. It can also be seen that this is an asymmetric device and is unique in that regard.
  • Initial tests were performed with assemblies having a diaphragm 6" high by 4"wide by 6"-8" deep. These devices exhibited a frequency response exceeding 5 octaves with an essentially flat output, i.e. within a 3db range from 500 hz to 18khz. This indicates unusually good transient response with very low coloration.
  • the device in another aspect of the invention, unlike other speaker designs the device actually benefits from being placed in a wall surface such as the dotted line represented by 'A' in FIG. 4. This presents a perfect half-plane environment over the midrange and top end yielding very smooth response in this difficult application. It is anticipated that the present invention is therefore well suited to "in wall” mounting, to mounting in a television enclosure, and in particular to incorporation with "flat panel” television units.

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)

Abstract

L'objet de la présente invention est un transducteur audio présentant d'excellentes caractéristiques audio. L'invention concerne notamment une membrane unique plane courbée qui est montée, au niveau de son extrémité entraînée, entre deux aimants linéaires espacés. Cette membrane est courbée selon une forme asymétrique semblable à celle d'un ressort élastique courbé. En d'autres termes, le rayon de courbure de la membrane augmente de façon continue sur la longueur de la membrane. Le haut-parleur conçu selon la présente invention présente d'excellentes caractéristiques lorsqu'il est monté sur une surface plane telle qu'un mur. De ce fait, il est particulièrement adapté à une utilisation dans des applications vidéo.
PCT/US2002/001319 2001-01-12 2002-01-14 Transducteur acoustique WO2002056636A2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2002248359A AU2002248359A1 (en) 2001-01-12 2002-01-14 Loudspeaker transducer
US10/909,231 US20050152575A1 (en) 2002-01-14 2004-07-29 Loudspeaker transducer

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US17564801P 2001-01-12 2001-01-12
US60/175,648 2001-01-12

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US10/909,231 Continuation US20050152575A1 (en) 2002-01-14 2004-07-29 Loudspeaker transducer

Publications (2)

Publication Number Publication Date
WO2002056636A2 true WO2002056636A2 (fr) 2002-07-18
WO2002056636A3 WO2002056636A3 (fr) 2002-10-31

Family

ID=22641077

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2002/001319 WO2002056636A2 (fr) 2001-01-12 2002-01-14 Transducteur acoustique

Country Status (2)

Country Link
AU (1) AU2002248359A1 (fr)
WO (1) WO2002056636A2 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1560502A (en) * 1925-01-15 1925-11-03 Forest Lee De Sound-reproducing device
US1638245A (en) * 1925-07-17 1927-08-09 Davis Charles Crawford Loud speaker
US1667149A (en) * 1925-08-11 1928-04-24 Siemens Ag Acoustic device
US1895494A (en) * 1926-08-17 1933-01-31 Western Electric Co Sound reproducer
US4584439A (en) * 1983-12-01 1986-04-22 Floating Membranes, Inc. Audio transducer with controlled flexibility diaphragm

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1560502A (en) * 1925-01-15 1925-11-03 Forest Lee De Sound-reproducing device
US1638245A (en) * 1925-07-17 1927-08-09 Davis Charles Crawford Loud speaker
US1667149A (en) * 1925-08-11 1928-04-24 Siemens Ag Acoustic device
US1895494A (en) * 1926-08-17 1933-01-31 Western Electric Co Sound reproducer
US4584439A (en) * 1983-12-01 1986-04-22 Floating Membranes, Inc. Audio transducer with controlled flexibility diaphragm

Also Published As

Publication number Publication date
WO2002056636A3 (fr) 2002-10-31
AU2002248359A1 (en) 2002-07-24

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