Patent ID: 8189847

Claim:
A dual-frequency coaxial earphone with a shared magnet, comprising: a housing, being provided, inside, with a receiving chamber; an outer yoke, having a hat-like shape and being arranged inside the receiving chamber of the housing, and including a crown portion and a flange portion, wherein the flange portion surrounds the crown portion, and the crown portion includes a top board and an annular wall, and wherein the top board is provided with a first central opening; a shared annular magnet, being arranged at interior of the top board of the outer yoke, and including a second central opening which is coaxial with the first central opening of the outer yoke; an inner yoke, having a flange-like shape, and including an inner sleeve and an outer disk, wherein the outer disk surrounds the inner sleeve, and, through the outer disk, the inner yoke is arranged on the shared annular magnet and located opposite to the outer yoke, and wherein the outer disk has an outer diameter smaller than an inner diameter defined by an inner wall of the outer yoke, and the inner sleeve has an outer diameter smaller than that of a diameter of the first central opening of the outer yoke, and the inner sleeve extends into the second central opening of the shared annular magnet, and into the first central opening of the outer yoke, and wherein the inner sleeve is provided, at center, with a third central opening; a low-frequency speaker part, including a low-frequency voice coil and a low-frequency diaphragm, wherein the low-frequency voice coil is disposed on the low-frequency diaphragm, and extends axially into and between the annular wall of the outer yoke and the outer disk of the inner yoke, and wherein the low-frequency voice coil, the annular wall, and the outer disk each maintains a clearance radially from one another, and wherein the low-frequency diaphragm is, circumferentially, disposed on the flange portion of the outer yoke; and a high-frequency speaker part, including a high-frequency voice coil and a high-frequency diaphragm, wherein the high-frequency voice coil is arranged on the high-frequency diaphragm and extends axially into and between the first central opening of the outer yoke and the inner sleeve of the inner yoke, and wherein the high-frequency voice coil, the first opening, and the inner sleeve each maintains another clearance radially from one another, and periphery of the high-frequency diaphragm is disposed on the crown portion of the outer yoke.