Results 241 to 250 of about 658,400 (290)

Ferrofluid Centered Voice Coil Speaker

The Journal of the Acoustical Society of America, 2011
An audio speaker has a driver unit having a support frame with a central portion forming a magnetic structure defining an annular gap around a central magnetic post, a vibration system having a diaphragm and a voice coil, the voice coil is attached to one side of the diaphragm where the vibration system is fixed to the support frame and where the voice
Shiro Tsuda, Ronald E. Rosensweig
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Electromagnetic actuator for voice coil

The Journal of the Acoustical Society of America, 1979
An electromagnetic actuator for linear driving of movable heads of a magnetic disc unit in an information processing system. A plurality of slits or plates are provided with a magnetic pole inscribed directly on the internal surface of a permanent magnet, and increase magnetic reluctance of the magnetic path and reduce inductance of a moving coil, thus
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Loudspeaker voice coil bearing

The Journal of the Acoustical Society of America, 1979
A dynamic loudspeaker which operates over a wide band of audio frequencies is disclosed. The speaker includes a speaker cone and voice coil structure of very low mass. A configuration of ribs on the cone and dust cap is important to both high and low frequency performance.
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Voice coil bobbin for planar diaphragm

The Journal of the Acoustical Society of America, 1983
A voice coil bobbin construction for a planar diaphragm loudspeaker including plural bobbin frames joined together to form the composite voice coil bobbin. In one embodiment, the bobbin frames each have a coupling member at each end thereof which are bonded together in a planar contact.
Kunihiko Shimada, Yukio Tsuchiya
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Audio transducer with etched voice coil

The Journal of the Acoustical Society of America, 1996
An audio transducer having a voice coil formed by an etched, flexible circuit having an elongated, oblong spiral loop and rolled into a cylindrical tube. The coil cooperates with a magnetic structure including a circular, central magnet having a front north pole plate and rear south pole plate sized to fit closely within the cylindrical coil, and an ...
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Loudspeaker with improved voice coil support

The Journal of the Acoustical Society of America, 1980
A loudspeaker comprising a voice coil bobbin with a voice coil wound around its periphery and a line spanned so as to surround the voice coil bobbin, which includes hanging zones for passing by the voice coil bobbin and connecting portions for linking the hanging zones.
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Multiple voice-coil cone-driver

The Journal of the Acoustical Society of America, 2006
A multiple voice-coil cone-driver for driving a loudspeaker includes a first voice-coil, and a second voice-coil coupled in parallel to the first voice-coil. Together, the first and second voice-coils in parallel are characterized by a baseline frequency response with an upper threshold frequency.
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Voice coil navigation sensor for endoscopic silicone intubation

2014 11th International Conference on Ubiquitous Robots and Ambient Intelligence (URAI), 2014
This paper presents a novel sensor structure that can be used for navigation in medical intubation or endoscopie procedures. By utilizing coil sets of untraditional shape, a compact and easily implementable system can be designed. Unlike oxygen sensors or x-ray imaging equipment, it requires minimum modification on existing intubation devices. Modeling
Wu Fang, Seung Ki Moon, Hungsun Son
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Optimal control of a voice-coil-motor with Coulombic friction

2008 47th IEEE Conference on Decision and Control, 2008
The voice-coil-motor is a widely used mechatronic device, which represents a typical electrodynamic actuator for machine tool axes, bonding machines and hydraulic/pneumatic valve drives. One principal task consists in steering the system precisely to a prescribed target in minimal time or with minimal energy.
Bahne Christiansen, Helmut Maurer, Oliver Zirn   +2 more
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VOICE COIL BOBBIN AND SPEAKER SYSTEM

The Journal of the Acoustical Society of America, 2012
A voice coil bobbin, which transmits a motive force from the voice coil wound around the bobbin to a diaphragm, includes a main part, a reinforcement part formed on the surface side of the main part, and a middle part formed between the main part and the reinforcement part and made of a material which has a lower density than the other two parts ...
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