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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Main Author | |
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Format | Patent |
Language | English |
Published |
21.12.1982
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Subjects | |
Online Access | Get full text |
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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. |
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Bibliography: | Application Number: JP19810093879 |