Directly-drive ball top type loudspeaker

Abstract

The invention provides a direct drive global roof type loudspeaker, which includes a loudspeaker magnetic circuit structure which could generate a circle belt shaped radial permanent magnetic field, and a convex global roof shaped sound film and a corrugated rim connected therewith. The invention is characterized in that a wire-wound speech coil is directly formed on the sound film surface which is on the connection of the sound film global roof and the corrugated rim. Technically the speech coil is a lead for coating the insulating layer, and the speech coil can be directly coiled on the connection, or a pre-coiled coil which is directly fixed on the connection. Particularly, when the chose sound film is a textile sound film, the coil could be a lead for coating the insulating layer, which is weaved on the connection in the mode similar to sewing, thereby strengthening the integration of the sound film and the speech coil. The loudspeaker has the advantages of flat membrane type direct drive wide frequency response, free material-choosing of the global roof type sound film, graceful timbre, and wire-wound speech coil with small volume, high efficiency and uniform magnetic field or the like.

Description

technical field [0001] The invention relates to a structural improvement of a dome speaker. Background technique [0002] The existing dome loudspeaker has a structure such as figure 1 As shown, it includes the magnetic circuit structure of the loudspeaker composed of T-shaped iron parts (7), ring-shaped permanent magnet steel (6), and ring-shaped magnet-conducting sheet (5), a dome-shaped sound membrane (1), and a ring (2). , bobbin (4) and voice coil (3). The dome-shaped sound film can be concave or convex, and it is assembled in the center of the speaker. , diamond, ceramics and other hard shell materials, and are called soft dome speakers and hard dome speakers respectively. The outer edge of the sound film is a ring, which is generally semicircular, with both convex upward and concave downward. The ring provides the compliance and amplitude of vertical vibration, and also provides horizontal "centering" to prevent vibration. The sound film and the voice coil have la...

AI Technical Summary

Problems solved by technology

[0005] One is that the processing of the sound film is more difficult, because the heat setting of this narrow deep groove is more complicated, and it is necessary to ensure the accuracy of the inner and outer diameters and depths. For many materials such as fabrics or metal films, it may be difficult to achieve. Generally, only The technology can be implemented using a polymer resin film for heat setting, which places a limit on the performance of the loudspeaker

[0006] The second is that the voice coil is wrapped in the middle by glue and the annular voice coil frame, which is not conducive to the heat dissipation of the voice coil

Therefore, the risk of burning the voice coil due to high temperature is greatly increased when using high power

For general loudspeakers, the power of 10-20W is often required, and the temperature at the voice coil often reaches 200°C or higher. For this structure that is not conducive to heat dissipation, the temperature of the voice coil will be even higher. The sound film material of the polymer resin film is generally used at a temperature of only about 100°C, which limits this structure to only be suitable for some low-power applications, such as the receiver of the portable phone described in CN1222049A. Occasions with low requirements and compact structure

[0007] The third is the restriction on the shape of the folding ring

Since there is a magnetic pole plate under the ring, in order to ensure that the speaker has sufficient amplitude, it can only adopt the shape of a convex ring. To fill a lot of glue, the increase in mass will bring unacceptable sensitivity drop and high frequency response degradation

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