CROSS-REFERENCE TO RELATED APPLICATIONS

The present application is the U.S. National Phase under 35. U.S.C. § 371 of International Application PCT/CN2018/106913, filed Sep. 21, 2018, which claims priority of Chinese Patent Application No. CN 201810455443.8, filed on May 14, 2018, the entire content of which is incorporated herein by reference.

FIELD OF THE INVENTION

The invention relates to the field of loudspeaker, in particular to a high-pitched loudspeaker.

BACKGROUND OF THE INVENTION

Existing high-pitched speaker usually comprises frame, a diaphragm arranged on the frame, a voice coil connected to the diaphragm and a magnetic circuit system fixedly connected to the frame. The magnetic circuit systems are divided into an inner magnetic structure and an outer magnetic structure. The inner magnetic structure includes a T-iron, and an air gap cavity is formed between the T-iron and the voice coil and the diaphragm; the outer magnetic structure includes a front plate, a magnetic steel and a U-iron which are sequentially stacked, and an air gap cavity is formed between the front plate and the voice coil and the diaphragm. The air gap cavity of the existing high-pitched loudspeaker is small, the starting frequency is narrow and the distortion is large.

SUMMARY OF THE INVENTION

In order to solve the above-mentioned problems, the present disclosure aims to provide a high-pitched loudspeaker, which widens the starting frequency of the high-pitched loudspeaker, and the high-pitched loudspeaker has a smoother intermediate frequency curve and less distortion.

The present disclosure provides a high-pitched loudspeaker, comprising a magnetic circuit system, a voice coil and a diaphragm connected to the voice coil, a first cavity is formed between the magnetic circuit system and the voice coil and the diaphragm, wherein the high-pitched loudspeaker further comprises a back cover, the magnetic circuit system is arranged between the diaphragm and the back cover, and a second cavity is formed between the back cover and the magnetic circuit system, a through-hole is opened in the magnetic circuit system, and the through-hole communicates the first cavity and the second cavity to form an air gap cavity of the high-pitched loudspeaker.

In an embodiment, the high-pitched loudspeaker further comprises a damping material arranged in the air gap cavity.

In an embodiment, the damping material is arranged in the first cavity and/or the second cavity of the air gap cavity.

In an embodiment, the damping material is arranged between the magnetic circuit system and the back cover and covers the through-hole.

In an embodiment, the damping material is polyurethane foam or foamed rubber or felt.

In an embodiment, one or more though holes are opened in the magnetic circuit system, and the through-hole is a round hole, a elliptical hole or a polygonal hole.

In an embodiment, the magnetic circuit system includes a T-iron, the magnetic steel and the front plate arranged around the T-iron, and the through-hole is arranged on the T-iron.

In an embodiment, the diaphragm is arranged on a frame, the front plate, the magnetic steel and the T-iron are fixedly connected to the frame, and the back cover is fixedly connected to the magnetic steel.

In an embodiment, the magnetic circuit system includes a front plate, a magnetic steel, and a U-iron sequentially arranged, the diaphragm is arranged on a frame, and an outer edge of the U-iron is fixedly connected between the frame, the front plate and the magnetic steel are located between the diaphragm and the U-iron, and the through-hole is arranged on the front plate, the magnetic steel and the U-iron, and sequentially penetrates the front plate, the magnetic steel and the U-iron.

In an embodiment, the back cover is fixedly connected to the frame.

Due to the use of the above scheme, the present disclosure has the following advantages compared with the prior art:

a back cover is arranged on the back side of the magnetic circuit system, a through-hole is opened on the magnetic circuit system of the high-pitched loudspeaker, and the cavity at the back of the high-pitched loudspeaker is increased, and the air gap of the high-pitched loudspeaker is increased, such that the FO (loudspeaker's resonance frequency) of the high-pitched loudspeaker is lowered, the intermediate frequency portion of the high-pitched loudspeaker is extended forward further to widen the starting frequency of the high-pitched loudspeaker; the Q (quality factor) value of the high-pitched loudspeaker is reduced, thereby smoothing the intermediate frequency curve of the high-pitched loudspeaker, reducing the distortion of the high-pitched loudspeaker, and improving the sound quality.

