Speaker diaphragm assembly and a method of manufacturing the same
First Claim
1. A method of making a speaker diaphragm assembly comprising:
- (a) forming a foam resin body having front and rear end portions and a uniform density throughout the inside of said body by heating a first raw material having a relatively great foam magnification; and
(b) forming a sound radiating surface portion that is made of the same sort resin as said foam resin and is integrally formed on said front end portion of said body by heating a second raw material resting on the front end portion of the body, the second raw material having a relatively small foam magnification so that the density of said sound radiating surface portion is greater than the density inside of said body.
1 Assignment
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Accused Products
Abstract
A speaker diaphragm assembly comprises a body made of a foam resin, and a sound radiating surface portion integrally formed with the body. In one embodiment, the sound radiating surface portion is made of a foam resin the density of which is greater than that at the body. In another embodiment, the sound radiating surface portion comprises a thin layer made of a solid resin, which thin layer is welded to the body. The rear end portion of the body may be reinforced in the same manner. In another embodiment, a supporting member is attached to the side surface of the diaphragm body for increasing the efficiency in vibration transmission from the voice coil. In another embodiment, a ring-like recess is made in the side surface of the body for spaced electrical terminals, to which heat is transmitted from the voice coil via lead wires, from the body, while a sub cone having low thermal conductivity is sandwiched between the lead wires and the body.
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Citations
30 Claims
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1. A method of making a speaker diaphragm assembly comprising:
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(a) forming a foam resin body having front and rear end portions and a uniform density throughout the inside of said body by heating a first raw material having a relatively great foam magnification; and (b) forming a sound radiating surface portion that is made of the same sort resin as said foam resin and is integrally formed on said front end portion of said body by heating a second raw material resting on the front end portion of the body, the second raw material having a relatively small foam magnification so that the density of said sound radiating surface portion is greater than the density inside of said body.
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2. A method of manufacturing a speaker diaphragm, comprising the steps of:
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(a) placing a thin layer made of a resin on a lower mold for forming a sound radiating surface of said diaphragm; (b) placing an upper mold on said lower mold, said upper mold extending upwardly and having a hole at the top thereof for receiving a cap; (c) putting a raw material of a foam resin, of the same sort as said resin, in said upper mold in such a manner that said raw material is placed on said thin layer; (d) tightening said cap; and (e) heating said upper and lower molds to effect foaming of said raw material so that said thin layer is welded to the body of said diaphragm made of said foam resin. - View Dependent Claims (3)
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4. A method of manufacturing a speaker diaphragm made of a foam resin, comprising the steps of:
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(a) putting a first raw material of a foam resin, the foam magnification of which is relatively small, in a mold constructed of a lower mold for forming a sound radiating surface of said speaker diaphragm, an upper mold extending upwardly from said lower mold, and a cap to be inserted in a hole made in said upper mold; (b) putting a second raw material of a foam resin, the foam magnification of which is relatively great, in said mold in such a manner that said second raw material is placed on said first raw material; (c) tightening said cap; and (d) heating said mold to effect foaming of said first and second raw materials so that said speaker diaphragm having said sound radiating surface, at which the density of the foam resin is greater than that at the inside of said speaker diaphragm, is obtained. - View Dependent Claims (5, 6)
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7. A speaker diaphragm assembly comprising:
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(a) a foam resin body having front and rear end portions, said foam resin having uniform density throughout the inside of said body as is obtained by heating a first raw material having a relatively great foam magnification; and (b) a sound radiating surface portion of the same sort of resin as said foam resin and integrally formed with said front end portion of said body, said foam resin of said sound radiating surface portion having a density greater than that at the inside of said body as formed by heating a second raw material having a relatively small foam magnification.
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8. A speaker diaphragm assembly comprising:
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(a) a foam resin body having front and rear end portions, said foam resin having uniform density throughout the inside of said body, said foam resin being formed by heating a first raw material having a relatively great foam magnification; and (b) a sound radiating surface portion made of the same sort of resin as said foam resin and integrally formed with said front end portion of said body, said foam resin of said sound radiating surface portion being formed by heating a second raw material having a relatively small foam magnification so that the density of said sound radiating surface portion is greater than that at the inside of said body. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A speaker comprising:
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(a) a housing; (b) a magnetic circuit means having a magnetic gap, said circuit means being connected fixedly to said housing; (c) a voice coil bobbin reciprocally movable in said magnetic gap; (d) a voice coil wound around the bobbin; (e) an electric circuit having electrical connections between said voice coil and speaker terminals; (f) a damper connected between said voice coil bobbin and said housing; and (g) a diaphragm assembly having a body made of a foam resin, a sound radiating surface portion, and a supporting member, said body having a front end portion integrally formed with said sound radiating surface portion, a rear end portion, and a side surface extending between said sound radiating surface portion and said rear end portion, said rear end portion being fixedly connected to one end of said voice coil bobbin, said supporting member having one end connected to said voice coil bobbin and extending toward said sound radiating surface portion along said side surface to terminate at a point between said sound radiating surface portion and said rear end portion so that said supporting member covers half or less than half of the entire side surface, said supporting member being fixedly connected to said side surface to cover a portion of said side surface close to said rear end portion, said body having front and rear end portions, said foam resin constituting said body having uniform density throughout the inside of said body as formed by heating a first raw material having a relatively great foam magnification, said sound radiating surface portion having a density greater than that at the inside of said body as formed by heating a second raw material having a relatively small foam magnification, the sound radiating surface portion being made of the same sort resin as said foam resin of said body and integrally formed with said front end portion of said body. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A speaker comprising:
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(a) a housing; (b) a magnetic circuit means having a magnetic gap and connected fixedly to said housing; (c) a voice coil wound around a voice coil bobbin which is reciprocally movable in said magnetic gap; (d) electrical circuits for establishing electrical connections between said voice coil and speaker terminals; (e) a damper connected between said voice coil bobbin and said housing; and (f) a diahragm assembly having a body made of a foam resin, a sound radiating surface portion, and a supporting member, said body having a front end portion integrally formed with said sound radiating surface portion, a rear end portion, and a side surface extending between said sound radiating surface portion and said rear end portion, said rear end portion being fixedly connected to one end of said voice coil bobbin, said supporting member having one end connected to said voice coil bobbin and extending toward said sound radiating surface portion along said side surface to terminate at a point between said sound radiating surface portion and said rear end portion so that said supporting member covers half or less than half of the entire side surface, said supporting member being fixedly connected to said side surface to cover a portion of said side surface close to said rear end portion, said supporting member being made of a material having a low thermal conductivity, a recess on said side surface, said supporting member having through-holes for receiving respective electrical terminal means, the positions of said through-holes being selected so that said through-holes correspond to said recess. - View Dependent Claims (28, 29, 30)
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Specification