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Class Information
Number: 381/423
Name: Electrical audio signal processing systems and devices > Electro-acoustic audio transducer > Electromagnetic (e.g., dyynamic) > Specified diaphragm shape or structure
Description: Subject matter including a flexible membrane with a particular geometrical contour or made of a specified material.










Sub-classes under this class:

Class Number Class Name Patents
381/429 Apertures in surface 27
381/432 Conical 85
381/426 Critically defined material or lamination 115
381/430 Dome or round 117
381/431 Flat 317
381/424 Plural portions or sections 115


Patents under this class:
1 2 3 4 5 6 7 8

Patent Number Title Of Patent Date Issued
8705790 Speaker diaphragm, and speaker and handheld terminal device using said speaker diaphragm Apr. 22, 2014
8660279 Nested compound loudspeaker drive unit Feb. 25, 2014
8646570 Diaphragm of electric sound converter and its manufacturing method Feb. 11, 2014
8638975 Wiper seal for passive radiator Jan. 28, 2014
8630440 Loudspeakers Jan. 14, 2014
8625825 Electrostatic speaker Jan. 7, 2014
8582795 Robust diaphragm for an acoustic device Nov. 12, 2013
8577076 Speaker device Nov. 5, 2013
8565452 Integrated acoustic transducer in MEMS technology, and manufacturing process thereof Oct. 22, 2013
8542865 Transducer motor structure and inside-only voice coil for use in loudspeakers Sep. 24, 2013
8532327 Diaphragm and speaker device provided with the same Sep. 10, 2013
8526664 Capacitor microphone unit and capacitor microphone Sep. 3, 2013
8479872 Ring shaped membrane for an electro-acoustical loudspeaker Jul. 9, 2013
8462978 Loudspeaker diaphragm Jun. 11, 2013
8457345 Vibration plate, speaker unit and portable information terminal Jun. 4, 2013
8447063 Flat thin dynamic speaker May. 21, 2013
8442259 System for vibration confinement May. 14, 2013
8442261 Diaphragm including a first vibrating part of a dome shape or flat shape and a second vibrating part of an annular shape and a loudspeaker using the diaphragm May. 14, 2013
8437496 Membrane for an acoustic device and acoustic device May. 7, 2013
8433091 Ultra-thin loudspeaker structure Apr. 30, 2013
8428298 Damper for speaker and speaker using the damper Apr. 23, 2013
8428295 Loudspeaker that is axially stabilized out of the diaphragm suspension plane Apr. 23, 2013
8428294 Slim speaker Apr. 23, 2013
8422724 Loudspeaker with a stiffening element Apr. 16, 2013
8411894 Transducer with deformable corner Apr. 2, 2013
8385584 Diaphragm and loudspeaker using the same Feb. 26, 2013
8379907 Vibrating member and electroacoustic transducer having same Feb. 19, 2013
8374381 Diaphragm and loudspeaker using the same Feb. 12, 2013
8363858 Diaphragm for condenser microphone, and condenser microphone Jan. 29, 2013
8363859 Microelectromechanical system microphone package structure Jan. 29, 2013
8355524 Magnetic circuit Jan. 15, 2013
8347482 Method for manufacturing ferrite magnet device, method for manufacturing non-reciprocal circuit device, and method for manufacturing composite electronic component Jan. 8, 2013
8351642 Speaker Jan. 8, 2013
8345916 Electroacoustic sound transducer, receiver and microphone Jan. 1, 2013
8340341 Coated speaker dome Dec. 25, 2012
8335338 Speaker and electronic apparatus and device using the same Dec. 18, 2012
8331606 Diaphragm and loudspeaker using the same Dec. 11, 2012
8331607 Speaker Dec. 11, 2012
8320604 Composite loudspeaker cone Nov. 27, 2012
8311264 Ultra-thin speaker Nov. 13, 2012
8306247 Electronic device and electro-acoustic transducer thereof Nov. 6, 2012
8300875 Speaker diaphragm and speaker including the same Oct. 30, 2012
8290200 Diaphragm and micro-electroacoustic device incorporating the same Oct. 16, 2012
8290201 Speaker Oct. 16, 2012
8284967 Electrostatic speaker having ventilative diaphragm Oct. 9, 2012
8284983 Coaxial loudspeaker Oct. 9, 2012
8270662 Loudspeakers, systems and components thereof Sep. 18, 2012
8265332 Speaker diaphragm and speaker Sep. 11, 2012
8265307 Acoustic transducer Sep. 11, 2012
8265291 High sensitivity noise immune stethoscope Sep. 11, 2012

1 2 3 4 5 6 7 8










 
 
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