Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
  • H04R1/00—Details of transducers, loudspeakers or microphones
  • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
  • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
  • H04R1/24—Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
  • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
  • H04R9/02—Details
  • H04R9/025—Magnetic circuit
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
  • H04R1/00—Details of transducers, loudspeakers or microphones
  • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
  • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
  • H04R1/30—Combinations of transducers with horns, e.g. with mechanical matching means, i.e. front-loaded horns
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; 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

• the first driver assembly includes a first top plate disposed coaxially above the first annular diaphragm
• the second driver assembly includes a second top plate disposed coaxially below the second annular diaphragm, the shared annular magnet disposed between the first top plate and the second top plate.
• the first phasing plug has a first inner edge and the second phasing plug has a second inner edge, wherein the first inner edge and the second inner edge are adjacent to each other such that the first acoustic pathway and the second acoustic pathway converge.
• a dual compression driver includes a first driver assembly including a first annular diaphragm disposed about a central axis, a first phasing plug disposed coaxially below the first annular diaphragm and having a first inner edge, and a first top plate disposed coaxially above the first annular diaphragm, the first phasing plug including a first plurality of apertures extending therethrough.
• a back cover is mounted to the first phasing plug, wherein an inner surface of the back cover and the output side of the first phasing plug form a first acoustic pathway for acoustic signals from the first plurality of apertures.
• a front adapter is mounted to the second phasing plug and having a hollow conduit formed therein along the central axis, the hollow conduit having a bottom end adjacent to the second phasing plug and a top end defining a circular exit of the dual compression driver, wherein an inner surface of the front adapter and the output side of the second phasing plug form a second acoustic pathway for acoustic signals from the second plurality of apertures. Acoustic signals from the first plurality of apertures and acoustic signals from the second plurality of apertures merge and radiate through the hollow conduit to the circular exit.
• a dual compression driver 100 is disclosed herein including a first or rear driver assembly 102 and a second or front driver assembly 104 which may be utilized in a transducer or loudspeaker.
• the first driver assembly 102 and the second driver assembly 104 may be configured to operate in the same frequency range or in different frequency ranges.
• the various components of the dual compression driver 100 may be disposed generally about a central axis 106.
• the first driver assembly 102 includes a first annular diaphragm 108 disposed about the central axis 106
• the second driver assembly 104 includes a second annular diaphragm 110 disposed about the central axis 106.
• the first annular diaphragm 108 and the second annular diaphragm 110 may be constructed from a polymer film.
• the first annular diaphragm 108 and the second annular diaphragm 110 are identical, but disposed with opposing orientations. As shown in FIGS.
• the first annular diaphragm 108 and the second annular diaphragm 110 each have an external portion 112 and an internal portion 114 joined by a middle portion 116.
• the middle portion 116 may include a coating to increase its stiffness or it may be constructed from a stiffer material compared with the external portion 112 and the internal portion 114, such that the external portion 112 and the internal portion 114 may act as flexible suspensions.
• Conventional annular diaphragms may include a V-shaped section between inner and outer, coplanar clamping portions.
• the middle portion 116 includes a step section 118 configured for attaching a first voice coil 120 to the first annular diaphragm 108 and a second voice coil 122 to the second annular diaphragm 110 ( FIG. 3 ).
• a step section 118 configured for attaching a first voice coil 120 to the first annular diaphragm 108 and a second voice coil 122 to the second annular diaphragm 110 ( FIG. 3 ).
• each segment 116a and 116b of the middle portion 116 is depicted herein as having the same angle with respect to the external portion 112 and the internal portion 114 and with respect to each other, these segments 116a, 116b instead may have different angles with respect to the external portion 112 and the internal portion 114 and with respect to each other.
• the step section 118 may be biased inward such that an internal angle between the segments 116a, 116b is obtuse, or the step section 118 may be biased outward such that the internal angle between the segments 116a, 116b is acute. Either of these configurations may provide added flexibility in controlling the mechanical behavior of the first annular diaphragm 108 and the second annular diaphragm 110.
• the first driver assembly 102 includes a first phasing plug 124 is disposed coaxially below the first annular diaphragm 108
• the second driver assembly 104 includes a second phasing plug 126 disposed coaxially above the second annular diaphragm 110.
• the first phasing plug 124 and the second phasing plug 126 are identical, but disposed with opposite orientations.
• the first phasing plug 124 and includes an input side 128 oriented toward the first annular diaphragm 108 and an output side 130 oriented away from the first annular diaphragm 108.
• the second phasing plug 126 includes an input side 128 oriented toward the second annular diaphragm 110 and an output side 130 oriented away from the second annular diaphragm 110.
• the first phasing plug 124 includes a first plurality of apertures 132 extending therethrough from the input side 128 to the output side 130
• the second phasing plug 126 includes a second plurality of apertures 134 extending therethrough from the input side 128 to the output side 130.
• the first phasing plug 124 and the second phasing plug 126 may be configured to correspond to the shape of the first annular diaphragm 108 and second annular diaphragm 110, respectively.
• the first phasing plug 124 and the second phasing plug 126 each have an outer portion 136 and an inner portion 138 joined by an intermediate portion 140.
• each outer portion 136 may be generally planar and lie in a plane orthogonal to the central axis 106.
• Each intermediate portion 140 has an inclined section 142 and a flat section 144.
• the inner portion 138 of the first phasing plug 124 is generally sloped and terminates in a first inner edge 146 and the inner portion 138 of the second phasing plug 126 is generally sloped and terminates in a second inner edge 148.
• the output side 130 of the first phasing plug 124 includes a first plurality of radial channels 150 extending inwardly from the first plurality of apertures 132 to the first inner edge 146, and the output side 130 of the second phasing plug 126 includes a second plurality of radial channels 152 extending inwardly from the second plurality of apertures 134 to the second inner edge 148.
• Each of the first and second pluralities of apertures 132, 134 is therefore acoustically connected to a corresponding one of the first and second pluralities of radial channels 150, 152.
• the first plurality of apertures 132 are formed in the intermediate portion 140 of the first phasing plug 124
• the second plurality of apertures 134 are formed in the intermediate portion 140 of the second phasing plug 126.
• the volume of air entrapped in the compression chamber is characterized by an acoustical compliance which is proportional to the volume of compression chamber.
• the height of the compression chamber may be quite small (e.g., approximately 0.5 mm or less) such that the volume of the compression chamber is also small.
• the small radial dimension of the first annular diaphragm 108 and the second annular diaphragm 110 corresponds to the small radial dimensions of the matching compression chamber 154, 156, which shifts undesirable air resonances (cross-modes) in the compression chamber 154, 156 to higher frequencies, sometimes above the audio range.
• the first phasing plug 124 and the second phasing plug 126 are directed radially towards each other at an angle.
• the middle portion 116 of the first annular diaphragm 108 is aligned with the inclined section 142 of the first phasing plug 124
• the middle portion 116 of the second annular diaphragm 110 is aligned with the inclined section 142 of the second phasing plug 126.
• the inner portion 138 of the first phasing plug 124 is configured to extend through the first annular diaphragm 108
• the inner portion 138 of the second phasing plug 126 is configured to extend through the second annular diaphragm 110.
• the configuration of the first and second annular diaphragms 108, 110 and the first and second phasing plugs 124, 126 contributes to minimizing the distance between the radial exits of the first and second phasing plugs 124, 126 (the first and second pluralities of radial channels 150, 152) at the first inner edge 146 and the second inner edge 148, such that the radial exits of the first and second phasing plugs 124, 126 converge with a minimum axial distance between them.
• the first driver assembly 102 includes a first annular top plate 158 disposed coaxially above the first annular diaphragm 108
• the second driver assembly 104 includes a second annular top plate 160 disposed coaxially below the second annular diaphragm 110.
• the dual compression driver 100 includes a single, shared annular permanent magnet 162 disposed between the first driver assembly 102 and the second driver assembly 104, such as between the first top plate 158 and the second top plate 160.
• the first plurality of apertures 132 and the second plurality of apertures 134 may each be arranged generally circumferentially about the central axis 106, generally forming a circle.
• the first plurality of apertures 132 and the second plurality of apertures 134 each have a "zig-zag" or sawtooth type configuration arranged generally circumferentially about the central axis 106 as shown.
• Such a meandering configuration of the apertures 132, 134 helps to mitigate any adverse influence of diaphragm breakups on frequency response, and may have the effect of smearing the air resonances in the first and second compression chambers 154, 156 so as to shape and improve the wavefront exiting the dual compression driver 100.
• the first plurality of apertures 132 and the second plurality of apertures 134 are not limited to the embodiments depicted herein and may include other suitable shapes and configurations.
• the first driver assembly 102 may also include a first annular pole piece 164 disposed coaxially above the first annular diaphragm 108 and inset from the first top plate 158.
• the second driver assembly 104 may also include a second annular pole piece 166 disposed coaxially below the second annular diaphragm 110 and inset from the second top plate 160. As shown in FIG. 3 , a top surface 168 of the first pole piece 164 abuts a bottom surface 170 of the second pole piece 166.
• an inner surface 204 of the back cover 194 and the output side 130 of the first phasing plug 124 form a first acoustic pathway 206 for acoustic signals from the first plurality of apertures 132 and the first driver assembly 102.
• acoustic signals from the first plurality of apertures 132 radiate inward along the first acoustic pathway 206 and acoustic signals from the second plurality of apertures 134 radiate inward along the second acoustic pathway 218 and merge at the central bore 192, then radiate through the hollow conduit 210 of the front adapter 208 to the circular exit 214 of the dual compression driver 100.

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• Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• Acoustics & Sound (AREA)
• Signal Processing (AREA)
• Health & Medical Sciences (AREA)
• Otolaryngology (AREA)
• Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

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Family Applications (1)

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Citations (3)

• 2024
  • 2024-12-18 EP EP24220852.8A patent/EP4589985A1/de active Pending

Patent Citations (3)

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