Speaker
AssigneeGenus Audio Corp.
InventorEiji Yamazaki
Life of this patent
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Abstract
A cone speaker that outputs audio by transmitting to a truncated cone, the movements of a voice coil driven when an audio current is transmitted through a voice coil placed inside a magnetic circuit formed in a space that surrounds a pole piece. Inside a space between the back surface of a center cap attached to a central portion of the cone and the apical surface of the pole piece that faces the center cap, a first filling material composed of a flexible porous body with a low porosity fills the periphery of the space and a second filling material composed of a flexible porous body with a higher porosity than the first filling material fills the central portion thereof.
Claims20
A cone speaker for transmitting to a truncated conical cone a motion of a voice coil that is driven by making audio current flow through a voice coil placed in a magnetic circuit formed in a space surrounding a pole piece, thereby causing the output of sound, characterized in that a first filler formed of a soft porous material having a low porosity is filled at a peripheral portion and a second filler formed of a soft porous material having a higher porosity than the first filler is filled at a center portion in a space between a back surface of a center cap secured to the center portion of the cone and an apical surface of the pole piece confronting the center cap.
A dome speaker for transmitting to a convex dome type vibrating plate projecting forward a motion of a voice coil that is driven by making audio current flow through a voice coil placed in a magnetic circuit formed in a space surrounding a pole piece, thereby causing the output of sound, characterized in that a first filler formed of a soft porous material having a low porosity is filled at a peripheral portion and a second filler formed of a soft porous material having a higher porosity than the first filler is filled at a center portion in a space between a back surface of the dome type vibrating plate and an apical surface of the pole piece confronting the dome type vibrating plate.
A horn speaker for transmitting to a convex vibrating plate projecting forward a motion of a voice coil that is driven by making audio current flow through a voice coil placed in a magnetic circuit formed in a space surrounding a pole piece, thereby causing the output of sound, and amplifying the sound through a horn provided at the front side of the vibrating plate, characterized in that a first filler formed of a soft porous material having a low porosity is filled at a peripheral portion and a second filler formed of a soft porous material having a higher porosity than the first filler is filled at a center portion in a space between a back surface of the convex vibrating plate projecting forward and an apical surface of the pole piece confronting the convex vibrating plate.
A horn speaker for transmitting to a convex vibrating plate projecting backward a motion of a voice coil that is driven by making audio current flow through a voice coil placed in a magnetic circuit formed in a space surrounding a pole piece, thereby causing the output of sound, and amplifying the sound through a horn provided at the front side of the vibrating plate, characterized in that a back cover is secured at the backside of the convex vibrating plate projecting backward so as to be spaced from the convex vibrating plate through a predetermined gap, and in a space between a back surface of the vibrating plate and an inner surface of the back cover, a first filler formed of a soft porous material having a low porosity is filled at a peripheral portion and a second filler formed of a soft porous material having a higher porosity than the first filler is filled at a center portion.
Dependencies are inferred from the claim text.