Electro-acoustic transducer
First Claim
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1. An electro-acoustic transducer, comprising:
- a vibration system having a diaphragm, a voice coil bobbin and a voice coil wound about the bobbin;
a magnetic circuit system forming a magnetic gap in which is positioned said voice coil; and
a frame supporting, via a suspension member, said diaphragm,wherein at least one of the constituent members of said vibration system is comprised of a composite material of cellular plastics and reinforcing fibers integral with the cellular plastics.
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Abstract
In an electro-acoustic transducer in a loud speaker and like devices, a diaphragm and/or a voice coil bobbin is or are formed by a composite material consisting of a foamed resin containing reinforcing fibers. Such diaphragm has a large Young'"'"'s modulus-to-density ratio E/ρ, a large internal loss tanδ and a large flexural rigidity E.I, and thus it exhibits good characteristics in sound reproducing. Such voice coil bobbin which is an electric insulator can have a small thickness and is light in weight and has a large mechanical strength, and thus it is free from adversely affecting the vibration of the diaphragm, and accordingly, the sound reproduced.
69 Citations
25 Claims
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1. An electro-acoustic transducer, comprising:
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a vibration system having a diaphragm, a voice coil bobbin and a voice coil wound about the bobbin; a magnetic circuit system forming a magnetic gap in which is positioned said voice coil; and a frame supporting, via a suspension member, said diaphragm, wherein at least one of the constituent members of said vibration system is comprised of a composite material of cellular plastics and reinforcing fibers integral with the cellular plastics. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 24, 25)
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13. An electro-acoustic transducer, comprising:
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a vibration system having a diaphragm and a voice coil bobbin wound with a voice coil; a magnetic circuit system forming a magnetic gap in which is positioned said voice coil; and a frame supporting, via a suspension member, said diaphragm, said diaphragm employing a composite material prepared with cellular plastics and its reinforcing fibers for constructing at least one constituent member of said diaphragm; wherein said diaphragm has a sandwich structure formed with a core member and at least one skin member bonded to a surface of said core member, and wherein said skin member is prepared with said composite material. - View Dependent Claims (14, 15, 20, 21, 22, 23)
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16. An electro-acoustic transducer, comprising:
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a vibration system having a diaphragm and a voice coil bobbin wound with a voice coil; a magnetic circuit system forming a magnetic gap in which is positioned said voice coil; and a frame supporting, via a suspension member, said diaphragm, said diaphragm employing a composite material prepared with cellular plastics and its reinforcing fibers for constructing at least one constituent member of said diaphragm; wherein said diaphragm has a sandwich structure formed with a core member and at least one skin member bonded to a surface of said core member, said core member being prepared with said composite material, and said skin member being prepared with a fiber-reinforced plastics reinforced by fibers selected from the group consisting of carbon fibers, glass fibers and aromatic polyamide fibers. - View Dependent Claims (18, 19)
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17. An electro-acoustic transducer, comprising:
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a vibration system having a diaphragm and a voice coil bobbin wound with a voice coil; a magnetic circuit system forming a magnetic gap in which is positioned said voice coil; and a frame supporting, via a suspension member, said diaphragm, said diaphragm employing a composite material prepared with cellular plastics and its reinforcing fibers for constructing at least one constituent member of said diaphragm; wherein said diaphragm has a sandwich structure formed with a core member and at least one skin member bonded to a surface of said core member, said core member being prepared with said composite material, and said skin member being prepared with a ceramics selected from the group consisting of beryllium oxide, magnesium oxide, alumina and silicon dioxide.
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Specification