ELECTROACOUSTIC TRANSDUCER AND MAGNETIC CIRCUIT UNIT

An electroacoustic transducer includes a magnetic circuit unit having a yoke, a magnet secured to the top of the bottom wall portion of the yoke, and a top plate secured to the top of the magnet. An annular magnetic gap is defined between the peripheral wall portion of the yoke and the top plate. A...

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Bibliographic Details
Main Author ITAKURA TOSHIO
Format Patent
LanguageEnglish
Published 18.12.2008
Subjects
DEAF-AID SETS
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS
PUBLIC ADDRESS SYSTEMS
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Summary:An electroacoustic transducer includes a magnetic circuit unit having a yoke, a magnet secured to the top of the bottom wall portion of the yoke, and a top plate secured to the top of the magnet. An annular magnetic gap is defined between the peripheral wall portion of the yoke and the top plate. A voice coil is disposed in the magnetic gap of the magnetic circuit unit. A diaphragm is secured to the voice coil, and a space is formed between the diaphragm and the top plate. The outside of the transducer and the space are communicated with each other through mutually communicated through-holes formed in the bottom wall portion of the yoke, the magnet and the top plate, respectively. The through-hole of the yoke has an inner diameter larger than the inner diameter of the through-hole of the magnet. A filter is disposed in the through-hole of the yoke and bonded to the magnet, thereby preventing entry of contamination into the space from the outside of the electroacoustic transducer.
Bibliography:Application Number: US20080140800