Patents-Review.com
ClassID:

231991 ⎘

H04R9/027 - CPC Classification

Classification description:

Transducers of moving-coil, moving-strip, or moving-wire type; Details; Magnetic circuit Air gaps using a magnetic fluid

Recent Application in this class:
#1
20250386147
2025-12-18

Acoustic electromagnetic actuator with opposed magnet and spring force and output device thereto

 #2
20250150760
2025-05-08

LOUDSPEAKERS

 #3
20250126412
2025-04-17

SOUND-GENERATING DEVICE

 #4
20250126411
2025-04-17

SPEAKER DRIVER ASSEMBLY

 #5
20240187793
2024-06-06

SPEAKER

 #6
20240080623
2024-03-07

Speaker

 #7
20240073587
2024-02-29

Sound device

 #8
20240064471
2024-02-22

Acoustic receivers with multiple diaphragms

 #9
20240056742
2024-02-15

Speaker

 #10
20240048912
2024-02-08

Loudspeaker using semiconductor voice coil and electronic device using the same

 #11
20230328427
2023-10-12

Multifunctional sounding device

 #12
20230319482
2023-10-05

LOUDSPEAKER

 #13
20230239608
2023-07-27

Speaker

 #14
20230224642
2023-07-13

Loudspeaker and earphone

 #15
20230199399
2023-06-22

Speaker

 #16
20230199398
2023-06-22

Sound production unit and speaker

 #17
20230199372
2023-06-22

Speaker

 #18
20230179921
2023-06-08

Speaker

 #19
20230164491
2023-05-25

Speaker

 #20
20230156383
2023-05-18

Speaker box

 #21
20230148010
2023-05-11

Speaker and electronic device

 #22
20230128831
2023-04-27

Loudspeaker and electronic apparatus

 #23
20230082965
2023-03-16

Acoustic receivers with multiple diaphragms

 #24
20230071811
2023-03-09

Electrodynamic actuator for a speaker or a sound transducer with improved damping

 #25
20230033025
2023-02-02

Speaker

 #26
20230031271
2023-02-02

Speaker

 #27
20230019916
2023-01-19

Loudspeaker with a fin-reinforced voice coil structure

 #28
20220394389
2022-12-08

Integrated transducer

 #29
20220369039
2022-11-17

Multi-input-driving loudspeaker

 #30
20220369009
2022-11-17

Acoustic device and electronic apparatus

 #31
20220345826
2022-10-27

Conductive film for a sound generation device and the sound generation device

 #32
20220345824
2022-10-27

Sound-producing apparatus, acoustic module provided with sound-producing apparatus, and electronic device

 #33
20220329949
2022-10-13

Sound production device and electronic apparatus therefor

 #34
20220312123
2022-09-29

Speaker

 #35
20220312122
2022-09-29

Multi magnet electrodynamic acoustic transducer and electroacoustic system

 #36
20220295173
2022-09-15

Speaker unit and speaker

 #37
20220210574
2022-06-30

Diaphragm for Waterproof Microspeaker

 #38
20220210572
2022-06-30

Speaker

 #39
20220210545
2022-06-30

Speaker device

 #40
20220174382
2022-06-02

Speaker device

 #41
20220174381
2022-06-02

Speaker device

 #42
20220150643
2022-05-12

Acoustic receivers with multiple diaphragms

 #43
20220070589
2022-03-03

Flat speaker driven by a single permanent magnet and one or more voice coils

 #44
20210368274
2021-11-25

Speaker diaphragm and speaker apparatus

 #45
20210306776
2021-09-30

Bone conduction device including a balanced electromagnetic actuator having radial and axial air gaps

 #46
20210302386
2021-09-30

ELECTROMAGNETIC TRANSDUCER WITH DUAL FLUX

 #47
20210204065
2021-07-01

Acoustic receivers with multiple diaphragms

 #48
20210029463
2021-01-28

Double voice coil loudspeaker transducer unit

 #49
20200374613
2020-11-26

LOUDSPEAKER AND EARPHONES

 #50
20200366996
2020-11-19

SOUND OUTPUT DEVICE, EARPHONE, HEARING AID, AND MOBILE TERMINAL DEVICE

 #51
20200213785
2020-07-02

LOUDSPEAKER AND ACOUSTIC DEVICE

 #52
20200213762
2020-07-02

Speaker

 #53
20200213720
2020-07-02

Speaker

 #54
20200137498
2020-04-30

Loudspeaker structure

 #55
20200045472
2020-02-06

Speaker

 #56
20200045471
2020-02-06

SPEAKER

 #57
20200045468
2020-02-06

Speaker

 #58
20200045450
2020-02-06

Loudspeaker

 #59
20190349690
2019-11-14

System with thermoelectric conversion device

 #60
20190215625
2019-07-11

Bone conduction device including a balanced electromagnetic actuator having radial and axial air gaps

 #61
20190141453
2019-05-09

DIFFERENTIAL SPEAKER APPARATUS HAVING MOTION FEEDBACK FUNCTION

 #62
20190091725
2019-03-28

Vibration actuator

 #63
20180376247
2018-12-27

Electromagnetic transducer with non-axial air gap

 #64
20180372692
2018-12-27

Electromagnetic transducer with dual flux

 #65
20180367916
2018-12-20

Receiver assembly comprising an armature and a diaphragm

 #66
20180220239
2018-08-02

EARPLUGS, EARPHONES, AND EARTIPS

 #67
20170332174
2017-11-16

Slim acoustic transducer and image display apparatus having the same

 #68
20170070831
2017-03-09

Bone conduction device including a balanced electromagnetic actuator having radial and axial air gaps

 #69
20160345102
2016-11-24

Speaker device

 #70
20160219370
2016-07-28

Loudspeaker with ducts for transducer voice coil cooling

 #71
20160192079
2016-06-30

ROTARY FLUX ACOUSTIC TRANSDUCER

 #72
20160192077
2016-06-30

METHOD AND STRUCTURE FOR INDUCING ACOUSTIC SIGNALS AND ATTENUATING ACOUSTIC SIGNALS

 #73
20160192076
2016-06-30

Audio driver assemblies, headphones including the audio driver assemblies, and related methods

 #74
20160192075
2016-06-30

Speaker and vibration control unit

 #75
20160165335
2016-06-09

Loudspeaker with a helmholtz resonator

 #76
20160127839
2016-05-05

Acoustic transducer

 #77
20150382117
2015-12-31

Hearing prosthesis having an implantable actuator system

 #78
20150372580
2015-12-24

Moving magnet motors

 #79
20150296302
2015-10-15

LOUDSPEAKER WITH COMPLIANTLY COUPLED LOW-FREQUENCY AND HIGH-FREQUENCY SECTIONS

 #80
20150263689
2015-09-17

Audio signal processing device for adjusting volume

 #81
20150256046
2015-09-10

Inhibiting rocking of loads driven by plural levers

 #82
20150222998
2015-08-06

Bone conduction device including a balanced electromagnetic actuator having radial and axial air gaps

 #83
20150195655
2015-07-09

Moving coil module comprising a substrate patterned with a conductor trace

 #84
20150189442
2015-07-02

Electromagnetic transducer

 #85
20150189428
2015-07-02

Speaker and audio-visual system

 #86
20150172821
2015-06-18

Sound generator for vehicle

 #87
20150110337
2015-04-23

Speaker unit

 #88
20150016660
2015-01-15

Speaker device, audio visual equipment, mobile information processing apparatus, vehicle, and earphone

 #89
20140355815
2014-12-04

Innovative magnetic design for speakers

 #90
20140321692
2014-10-30

Loudspeaker

 #91
20140314267
2014-10-23

Speaker device with a magnetic gap filled with magnetic fluid and changing magnetic flux density in axial and circumferential directions

 #92
20140270328
2014-09-18

Driving plural armatures with a common stator

 #93
20140254859
2014-09-11

Acoustic transducer assembly

 #94
20140205135
2014-07-24

Loudspeaker and equipment including the same

 #95
20140161303
2014-06-12

Flat-type speaker having plurality of magnetic circuits which are horizontally connected

 #96
20140153749
2014-06-05

Magnetic yoke used for a moving-iron microphone/transducer

 #97
20140112504
2014-04-24

Audio driver and method for transforming an electrical signal into air movement

 #98
20140079258
2014-03-20

Loudspeaker, inner-ear headphone including loudspeaker, and hearing aid including loudspeaker

 #99
20140056455
2014-02-27

Earphone

 #100
20130294640
2013-11-07

Loudspeaker, video device, and portable information processing apparatus

 #101
20130202140
2013-08-08

Bone conduction device including a balanced electromagnetic actuator having radial and axial air gaps

 #102
20130148834
2013-06-13

Microspeaker with inner resonance chamber

 #103
20130121522
2013-05-16

Coaxial speaker system having a compression chamber with a horn

 #104
20130064414
2013-03-14

Coaxial speaker system having a compression chamber

 #105
20130051605
2013-02-28

Speaker device with a magnetic gap filled with magnetic fluid and changing magnetic flux density in axial and circumferential direction

 #106
20120257782
2012-10-11

ACOUSTIC TRANSDUCER

 #107
20120237067
2012-09-20

Bone conduction device including a balanced electromagnetic actuator having radial and axial air gaps

 #108
20120108887
2012-05-03

Hearing prosthesis having an implantable actuator system

 #109
20120087525
2012-04-12

Speaker, hearing aid, inner-ear headphone, portable information processing device, and AV device

 #110
20120039494
2012-02-16

Loudspeakers

 #111
20110311079
2011-12-22

Method and structure for inducing acoustic signals and attenuating acoustic signals

 #112
20110188698
2011-08-04

Electrodynamic transducer, in particular of the loudspeaker type with ferrofluid suspension and related devices

 #113
20110164780
2011-07-07

Sensory signal output apparatus

 #114
20110044489
2011-02-24

Loudspeaker, video device, and portable information processing apparatus

 #115
20100177928
2010-07-15

SPEAKER AND ELECTRONIC APPARATUS EMPLOYING THE SAME

 #116
20100172520
2010-07-08

ASSEMBLING METHOD OF SPEAKER AND ELECTRONIC APPARATUS EMPLOYING THAT SPEAKER

 #117
20100014704
2010-01-21

SPHERICAL SPEAKER

 #118
20090257617
2009-10-15

Speaker, voice coil unit, and method of manufacturing the voice coil unit

 #119
20090190794
2009-07-30

Acoustic transducer

 #120
20090180648
2009-07-16

Speaker device and speaker unit

 #121
20090028374
2009-01-29

Speaker and speaker apparatus

 #122
20090010481
2009-01-08

Audio speaker utilizing an unanchored magnet for primary force generation

 #123
20080285788
2008-11-20

Electrodynamic transducer including a dome with a ferrofluid suspension

 #124
20080205687
2008-08-28

Magnetic circuit for electrodynamic moving voice coil actuators

 #125
20070189577
2007-08-16

Ferrofluid centered voice coil speaker

 #126
20070104344
2007-05-10

Hearing aid mechanism

 #127
20060133638
2006-06-22

Audio speaker utilizing an unanchored magnet for primary force generation

 #128
20050281432
2005-12-22

Speaker device

 #129
20050105758
2005-05-19

Audio speaker and method for assembling an audio speaker

 #130
16706742
2020-06-02

Speaker

 #131
13248337
2015-12-15

Transducer with modifiable passive component