SPEAKER DEVICE

PURPOSE:To give damping to a minimum resonance peak caused on a sound pressure frequency characteristic in case of a constant current drive, by packing a magnetic fluid with a suitable viscosity in magnetic gap of a dynamic speaker. CONSTITUTION:A bobbin 9 wound with a voice coil on the outer circum...

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Bibliographic Details
Main Author KAWAMURA SHINICHIROU
Format Patent
LanguageEnglish
Published 21.12.1982
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:PURPOSE:To give damping to a minimum resonance peak caused on a sound pressure frequency characteristic in case of a constant current drive, by packing a magnetic fluid with a suitable viscosity in magnetic gap of a dynamic speaker. CONSTITUTION:A bobbin 9 wound with a voice coil on the outer circumference is inserted in a magnetic gap formed with a pole piece 6 and a yoke plate 7 and a magnetic fluid 5 with a suitable viscosity is packed around the voice coil 8. The bobbin 9 is fitted with a disc shape vibration diaphragm. This speaker is driven with constant current by a signal amplified with a constant current amplifier.
Bibliography:Application Number: JP19810093879