Moving-coil speaker

[0001] The disclosure relates to a moving-coil speaker, and particularly to a small size speaker having a diameter of 45 mm.

[0002] A moving-coil earphone is a most ordinary and common earphone. A driving unit of the moving-coil earphone is substantially a small size moving-coil speaker in which a voice coil in a permanent magnetic field drives a vibration membrane (or diaphragm) connected to the voice coil to vibrate. The moving-coil earphone has a high efficiency, can output driving power to an earphone of audio equipment, and is reliable and durable.

[0003] A headphone in current market uses a micro-speaker having a diameter of 30 mm, 40 mm, 50 mm, 57 mm, 60 mm and etc. However, for a supra-aural earphone, a speaker having a diameter of 40 mm is too small in size, has a relatively small radiation area, and has an insufficient radiated sound pressure when volume up is pressed. But a speaker having a diameter of 50 mm is relatively big, thus makes the whole set bulky.

[0004] The disclosure is intended to provide a moving-coil speaker having a diameter of 45 mm and an improved frequency-response curve.

[0005] To this end, embodiments of the disclose provide a moving-coil speaker, including a magnetic circuit unit and a toroidal support, connected to an exterior of the magnetic circuit unit, arranged to carry a diaphragm, the support being provided with a Printed Circuit Board (PCB) for soldering a wire thereon and performing current conduction, wherein the support has an outer diameter of 45 mm and has a positioning bone, arranged on a front surface of the support, which coincides with an extending line of a middle axis of the PCB, two groups of air holes are provided symmetrically on the support on both sides of the positioning bone, a tuning paper is attached on a surface of the support on each side of the positioning bone, and a distance between a first air hole of each group of air holes and the positioning bone is equal to a distance between a second air hole of said each group of air holes and a side edge of the PCB, the first air hole and the second air hole being located in a first place and a last place among said each group of air holes.

[0006] In an embodiment, each of the first and second air holes is in the shape of a circle, and a connection line from a center of the first air hole to a center of the support forms an included angle of 20 degree with an extending line of the positioning bone; and

[0007] a connection line from a center of the second air hole to the center of the support forms an included angle of 20 degree with an extending line of the side edge of the PCB.

[0008] In an embodiment, the diaphragm comprises a dome portion and an outer arc portion connected with an outer edge of the dome portion, there being at least 55 ribs disposed with uniform intervals on a surface of the outer arc portion.

[0009] In an embodiment, the diaphragm comprises a metallic coating layer coated at least on a surface of the dome portion.

[0010] In an embodiment, the diaphragm is made of a PAR material layer, a PU material layer and a PEEK material layer having a same shape.

[0011] In an embodiment, the diaphragm is made of PET material.

[0012] In an embodiment, the diaphragm is made of PEN material.

[0013] In an embodiment, the diaphragm is made of PEI material.

[0014] In an embodiment, the diaphragm is made of PEEK material.

[0015] Embodiments of the disclosure have the following beneficial effects.

[0016] To make a compromise between a speaker having a diameter of 40 mm and a speaker having a diameter of 50 mm, there is provided a speaker having an outer diameter of 45 mm so as to meet requirements of such earphones on structure and appearance.

[0017] As shown in FIG. 2, a tuning paper of a conventional speaker support is a whole tuning paper, thus for an adhesive-backed tuning paper, it tends to be deflectively attached, and it is difficult to adjust a deflectively attached adhesive-backed tuning paper, thereby resulting in a high scrap rate. Based on a conventional support, embodiments of the disclosure add a positioning bone, and make air holes offset slightly into two symmetrical portions. Furthermore, four side holes have a same angle with respect to positioning studs on both sides. Thus, thus tuning papers on the left and right sides of the support can use a same tuning paper, thereby facilitating sticking of an adhesive-backed tuning paper and reducing scrap rate of the tuning paper. In the structure design of the new support, air holes adjacent on two sides of the PCB have relatively close distances, and the overall distribution of all air holes is relatively dispersive. Thus, balanced air permeability is resulted, and it is possible to achieve the objective of improving the frequency-response curve and frequency-response characteristics through optimization of size and structure taking into consideration of vibration equilibrium.

[0023] As shown in FIG. 1, a moving-coil speaker according to an embodiment of the disclosure includes: a magnetic circuit unit 1, and a toroidal support 3, connected to an exterior of the magnetic circuit unit 1, for carrying a diaphragm 2.

[0024] The support 3 is provided with a Printed Circuit Board (PCB) 4 for soldering a wire thereon and performing current conduction, and the support 3 has an outer diameter of 45 mm.

[0025] As shown in FIG. 3, the support 3 has a positioning bone 5, arranged on a front surface of the support 3, which coincides with an extending line of a middle axis of the PCB 4, two groups of air holes 6 are provided symmetrically on the support 3 on both sides of the positioning bone 5, a tuning paper 7 is attached on a surface of the support 3 on each side of the positioning bone 5, and a distance between a first air hole of each group of air holes 6 and the positioning bone 5 is equal to a distance between a second air hole of said each group of air holes 6 and a side edge of the PCB 4, herein the first air hole and the second air hole is located in a first place and a last place among said each group of air holes 6.

[0026] Each of the first and second air holes is in the shape of a circle, and a connection line from a center of the first air hole to a center of the support 3 forms an included angle of 20 degree with an extending line of the positioning bone 5; and a connection line from a center of the second air hole to the center of the support 3 forms an included angle of 20 degree with an extending line of the side edge of the PCB 4. Certainly, the air holes may also have other shapes, such as rectangle, hexagon or the like.

[0027] As shown in FIG. 4, the diaphragm 2 includes a dome portion and an outer arc portion connected with an outer edge of the dome portion, and there are at least 55 ribs 8 disposed with uniform intervals on a surface of the outer arc portion. The diaphragm 2 has a metallic coating layer coated on a surface of the dome portion and on a partial surface of the outer arc portion. For tuning voice, position and area of the metallic coating layer may change arbitrarily.

[0028] In an embodiment, the diaphragm 2 is made of a PAR material layer, a PU material layer and a PEEK material layer having a same shape.

[0029] In an embodiment, the diaphragm 2 is made of PET material.

[0030] In an embodiment, the diaphragm 2 is made of PEN material.

[0031] In an embodiment, the diaphragm 2 is made of PEI material.

[0032] In an embodiment, the diaphragm 2 is made of PEEK material.

[0033] The disclosure is not limited to the above embodiments. Technical solutions according to above embodiments can be combined to obtain new technical solutions. In addition, all equivalents of the technical solutions of the disclosure fall within the scope of the claims.