Narrow-angle strong-directivity microphone

Abstract

The utility model provides a narrow-angle strong-directivity microphone which is characterized in that the narrow-angle strong-directivity microphone comprises an interference tube, a rear tube, a cylindrical damping layer, a consonant head, an acoustic isolation piece, a main sound head and an output circuit board, the consonant head and the main sound head are opposite in phase, and the consonant head and the main sound head are coaxially installed at the two ends of the acoustic isolation piece in a back-to-back mode and then are sleeved with the interference tube. The consonant head and the main sound head are respectively and electrically connected with the output circuit board, a consonant head main sound inlet hole and a consonant head main rear sound inlet hole are respectively arranged on two sides of the consonant head on the interference tube, and a main sound head main sound inlet hole and a main sound head main rear sound inlet hole are respectively arranged on two sides of the main sound head on the interference tube. The microphone is small in size, compact in structure, low in manufacturing cost and easy to produce and assemble, can better restrain sound signals outside the forward direction compared with a microphone with a single interference tube, has the function of controlling the sound field to be stable in real time to a certain extent due to the fact that the consonant head and the main sound head are opposite in phase in the sound amplification process, can effectively improve the pickup distance, and improves the sound amplification effect. And howling is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of microphones, and particularly relates to a narrow-angle highly directional microphone. Background Art

[0002] The directivity of a microphone refers to the sensitivity (input level) of the microphone at different incident angles with respect to the front (main axis direction). This angle-dependent response can be plotted as a graph to represent the microphone sensitivity determined by direction and frequency changes within a 360° range.

[0003] Generally speaking, the directivity of a microphone can be divided into the following two types: one is an omnidirectional microphone, which is a pressure-type microphone that can receive sounds from all directions. In other words, the diaphragm can receive sound pressure changes from all directions; the other is a directional microphone. This uses a pressure-difference sound reception method, that is, the pressure difference from the front, back, and sides of the diaphragm is picked up.

[0004] The directional microphones in the prior art, such as a narrow-angle directional capacitive microphone disclosed in the utility model patent CN207266290U, include a mounting bracket, a transmission wire for transmitting sound signals, and a shielding net with micropores. An inner cavity is formed within the shielding net. The mounting bracket is arranged within the inner cavity and is in close contact with the inner wall of the inner cavity. A sound head module is arranged within the mounting bracket, and the sound head module is connected to the transmission wire. The shielding net can effectively shield interference for the sound head module, helping to overcome technical drawbacks such as deteriorated frequency response, phase distortion, deteriorated directivity, and excessive directivity angle in traditional sound heads.

[0005] However, the directional microphones in the prior art are large in volume, high in manufacturing cost, and not easy to produce and assemble; moreover, the directivity distance needs to be improved, and the occurrence of howling during sound reinforcement still needs to be further reduced. Summary of the Utility Model

[0006] In order to make up for the deficiencies in the prior art, the utility model provides a narrow-angle highly directional microphone, which is small in volume, low in manufacturing cost, easy to produce and assemble, and can effectively increase the pickup distance and reduce the occurrence of howling.

[0007] In order to achieve the above object, the technical solution adopted by the utility model is as follows:

[0008] A narrow-angle highly directional microphone, comprising an interference tube, a rear tube, a cylindrical damping layer, a consonant head, an acoustic isolator, a main head, and an output circuit board. The phases of the consonant head and the main head are opposite, and the two are coaxially and oppositely mounted at both ends of the acoustic isolator and then inserted into the interference tube. The consonant head and the main head are respectively electrically connected to the output circuit board. Main sound inlet holes and rear sound inlet holes of the main head are respectively provided at the front end and both sides of the main head on the interference tube. Consonant head main sound inlet holes and consonant head rear sound inlet holes are respectively provided on both sides of the rear tube where the consonant head is located.

[0009] Further, a plurality of the consonant head main sound inlet holes and the consonant head rear sound inlet holes are provided and distributed along the circumferential direction of the rear tube.

[0010] Further, a plurality of the main head main sound inlet holes are provided and distributed along the radial direction of the interference tube, and a plurality of the main head rear sound inlet holes are provided and distributed along the radial direction of the interference tube.

[0011] Further, the interference tube is threadedly connected to the rear tube.

[0012] Further, a metal mesh cylinder is further provided in the interference tube, and the consonant head, the acoustic isolator, and the main head are provided in the metal mesh cylinder.

[0013] Further, a mesh cover is provided at the front end of the interference tube.

[0014] Compared with the prior art, the present utility model has the following beneficial technical effects:

[0015] The narrow-angle highly directional microphone of the present utility model combines the interference method and the phase method to achieve complementarity, can effectively eliminate the proximity effect, increase the pickup distance, make the product easy to debug, can better reduce the product volume and reduce the cost; at the same time, by using the characteristic that the consonant head and the main head are out of phase, the occurrence of howling during the sound reinforcement process can be reduced. Description of the Drawings

[0016] Figure 1 is a structural diagram of a narrow-angle highly directional microphone of the present utility model.

[0017] Figure 2 is an exploded view of a narrow-angle highly directional microphone of the present utility model.

[0018] Wherein: 1. Consonant head; 2. Acoustic isolator; 3. Main head; 4. Output circuit board; 5. Metal mesh cylinder; 6. Cylindrical damping layer; 7. Mesh cover; 8. Interference tube; 81. Main head main sound inlet hole; 82. Main head rear sound inlet hole; 9. Rear tube; 91. Consonant head main sound inlet hole; 92. Consonant head rear sound inlet hole. Detailed Embodiment

[0019] In the following description, many specific details are set forth in order to provide a thorough understanding of the present utility model. However, the present utility model can be implemented in many other ways different from this description, and those skilled in the art can make similar extensions without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0020] Embodiment 1

[0021] As Figure 1 、 2 shown, a narrow-angle strongly directional microphone includes a consonant head 1, an acoustic isolation member 2, a main sound head 3, an output circuit board 4, a metal mesh cylinder 5, a cylindrical damping layer 6, a metal mesh cover 7, an interference tube 8, and a rear tube 9.

[0022] The interference tube 8 and the rear tube 9 are connected by threads, which is easy for production and assembly. The phases of the consonant head 1 and the main sound head 3 are opposite, and they are coaxially and oppositely disposed at both ends of the acoustic isolation member 2. The consonant head 1 and the main sound head 3 are respectively electrically connected to the output circuit board 4.

[0023] There are two metal mesh cylinders 5, which are sleeved outside the combination formed by connecting the consonant head 1, the acoustic isolation member 2, the main sound head 3, and the output circuit board 4. Among them, the consonant head 1 and the output circuit board 4 are disposed inside the rear tube 9. On both sides of the consonant head 1 on the rear tube 9, there are respectively provided a main inlet sound hole 91 of the consonant head and a rear inlet sound hole 92 of the consonant head. Both the main inlet sound hole 91 of the consonant head and the rear inlet sound hole 92 of the consonant head are provided with a plurality of holes, and they are equally spaced along the circumferential direction of the rear tube 9.

[0024] The main sound head 3 is disposed inside the interference tube 8. On both sides of the main sound head 3 on the interference tube 8, there are respectively provided a main inlet sound hole 81 of the main sound head and a rear inlet sound hole 82 of the main sound head. A plurality of main inlet sound holes 81 of the main sound head are provided and distributed along the radial direction of the interference tube 8. A plurality of rear inlet sound holes 82 of the main sound head are provided and equally spaced along the radial direction of the interference tube 8.

[0025] The hole shape of the main inlet sound hole 81 of the main sound head can be a round hole, a square hole, or a strip hole, and is not limited herein. A cylindrical damping layer 6 covering the main inlet sound hole 81 is provided inside the interference tube 8. The mesh cover 7 is disposed at the front end of the interference tube.

[0026] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A narrow-angle highly directional microphone, characterized in that: It includes an interference tube, a rear tube, a cylindrical damping layer, a consonant head, an acoustic isolator, a main tone head, and an output circuit board. The phases of the consonant head and the main tone head are opposite, and they are coaxially and oppositely installed at both ends of the acoustic isolator and then inserted into the interference tube. The consonant head and the main tone head are respectively electrically connected to the output circuit board. On the interference tube, main tone head main sound inlet holes and main tone head rear sound inlet holes are respectively provided at the front end and both sides of the main tone head. On the rear tube, consonant head main sound inlet holes and consonant head rear sound inlet holes are respectively provided on both sides of the consonant head.

2. The narrow-angle highly directional microphone according to claim 1, characterized in that: There are multiple consonant head main sound inlet holes and consonant head rear sound inlet holes, and they are distributed along the circumferential direction of the rear tube.

3. The narrow-angle highly directional microphone according to claim 2, characterized in that: There are multiple main tone head main sound inlet holes and they are distributed along the radial direction of the interference tube. There are multiple main tone head rear sound inlet holes and they are distributed along the radial direction of the interference tube.

4. The narrow-angle highly directional microphone according to claim 3, characterized in that: The interference tube is threadedly connected to the rear tube.

5. The narrow-angle highly directional microphone according to claim 4, characterized in that: A metal mesh cylinder is further provided inside the interference tube, and the consonant head, the acoustic isolator, and the main tone head are arranged inside the metal mesh cylinder.

6. The narrow-angle highly directional microphone according to claim 5, wherein: A mesh cover is provided at the front end of the interference tube.

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