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US 5,715,324 AGranted
Speaker having magnetic circuit
AssigneeAlpine Electronics, Inc.
InventorsKei Tanabe, Nobuo Kakinuma, Shigeki Takei
Life of this patent
Estimating the term…
Abstract
A speaker in which the inner peripheral face of a ring-shaped soft ferrite core is cemented to a cylindrical projection extending from a lower portion of a bowl-shaped frame. An outer peripheral surface of a co-axially disposed ring-shaped bond magnet is fitted into a recess of the frame. Two magnetic gaps are formed between facing surfaces of the ring-shaped bond magnet and the ring-shaped soft ferrite core. Two voice coils are mounted on a cylindrical bobbin and suspended from a vibratory diaphragm such that the voice coils are inserted into the magnetic gaps.
Claims19
A speaker comprising:
- a frame having a base integrally connected to a cone member, the cone member having a narrow end connected to the base and a wide end,
- a magnetic circuit connected to the base, the magnetic circuit including a magnet structure and a magnetic member disposed coaxially with the magnet structure,
- a vibratory diaphragm having an outer edge connected to the wide end of the cone, the vibratory diaphragm having an inner edge,
- a cylindrical bobbin connected to the inner edge of the vibratory diaphragm, the cylindrical bobbin extending in an axial direction, and
- a plurality of voice coils wound upon the bobbin and spaced apart in the axial direction,
- wherein a plurality of coaxial ring-shaped magnetic gaps are formed between peripheral faces of the magnet structure and the magnetic member, each of the plurality of magnetic gaps having a common gap distance separating the magnet structure and the magnetic member,
- wherein each of the plurality of voice coils is positioned in one of the plurality of magnetic gaps, and
- wherein the plurality of voice coils are wound such that current flow through the voice coils produces driving forces which are exerted on the voice coils in a common axial direction.
5 more elements
A speaker comprising:
- a frame having a base integrally connected to a cone member, the cone member having a narrow end connected to the base and a wide end,
- a magnetic circuit connected to the base and forming a magnetic gap,
- a vibratory diaphragm having an outer edge connected to the wide end of the cone, the vibratory diaphragm having an inner edge,
- a cylindrical bobbin connected to the inner edge of the vibratory diaphragm, and
- a voice coil wound upon the bobbin and inserted in the magnetic gap of the magnetic circuit,
- wherein the magnetic circuit includes a magnet structure and a magnetic member disposed coaxially with the magnet structure,
- wherein the base of the frame includes an outer cylindrical portion connected to the cone, a bottom wall connected to the outer cylindrical portion, and an inner cylindrical portion connected to the bottom wall such that a recess is formed between the outer cylindrical portion and the inner cylindrical portion,
- wherein the magnetic member includes an outer peripheral surface which is smaller in diameter than an inner peripheral surface of the magnet structure, the magnetic gap being formed between the outer peripheral surface of the magnetic member and the inner peripheral surface of the magnet structure, and
- wherein the magnetic member and the magnet structure are positioned in the recess formed by the base, the magnetic member having a central opening receiving the inner cylindrical portion, and the magnet structure having an outer peripheral surface contacting an inner surface of the outer cylindrical portion of the base.
6 more elements
A speaker comprising:
- a frame having a base integrally connected to a cone member, the base including an outer cylindrical portion, a bottom wall connected to the outer cylindrical portion, and an inner cylindrical portion connected to the bottom wall such that a recess is formed between the outer cylindrical portion and the inner cylindrical portion, the cone member having a narrow end connected to the outer cylindrical portion and a wide end,
- a magnetic circuit received in the recess of the base and forming a magnetic gap,
- a vibratory diaphragm having an outer edge connected to the wide end of the cone, the vibratory diaphragm having an inner edge,
- a cylindrical bobbin connected to the inner edge of the vibratory diaphragm, and
- a voice coil wound upon the bobbin and being positioned in the magnetic gap of the magnetic circuit,
- wherein the magnetic circuit includes a magnet structure and a magnetic member disposed coaxially with the magnet structure, the magnetic gap being formed between peripheral faces of the magnet structure and the magnetic member,
- wherein the magnet structure includes an outer peripheral surface which is smaller in diameter than an inner peripheral surface of the magnetic member, the magnetic gap being formed between the outer peripheral surface of the magnet structure and the inner peripheral surface of the magnetic member,
- wherein the magnetic member and the magnet structure are positioned in the recess formed by the base, the magnet structure having a central opening receiving the inner cylindrical portion, and the magnetic member having an outer peripheral surface contacting an inner surface of the outer cylindrical portion of the base.
5 more elements
Dependencies are inferred from the claim text.