H04R2209/00 - CPC Classification Index

ClassID:

232134 ⎘

H04R2209/00 - CPC Classification

Classification description:

Details of transducers of the moving-coil, moving-strip, or moving-wire type covered by but not provided for in any of its subgroups

Sub-classes:

H04R2209/021 » Reduction of eddy currents in the magnetic circuit of electrodynamic loudspeaker transducer 18
H04R2209/022 » Aspects regarding the stray flux internal or external to the magnetic circuit, e.g. shielding, shape of magnetic circuit, flux compensation coils 137
H04R2209/024 » Manufacturing aspects of the magnetic circuit of loudspeaker or microphone transducers 132
H04R2209/026 » Transducers having separately controllable opposing diaphragms, e.g. for ring-tone and voice 39
H04R2209/027 » Electrical or mechanical reduction of yoke vibration 77
H04R2209/041 » Voice coil arrangements comprising more than one voice coil unit on the same bobbin 122
H04R2209/043 » Short circuited voice coils driven by induction 2

Recent Application in this class:

20210329384

Energy harvesting circuit comprising an active rectifier

20210016164

Content presentation system, content presentation device, and wind presenting device

20190327560

Speaker and terminal component thereof

20190098415

Evacuation of liquid from acoustic space

20180262840

Evacuation of liquid from acoustic space

20150319534

Evacuation of liquid from acoustic space

20140376766

Miniature moving-coil speaker

20140348373

Heat dissipation device for moving-coil loudspeaker

20140254191

Electrodynamic exciter and vehicle lamp employing the same

20140161303

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