CN216700318U - Megaphone - Google Patents

Abstract

The utility model discloses a megaphone, and relates to the technical field of public address equipment, wherein the megaphone comprises a horn, a megaphone body, a microphone and a loudspeaker; the horn is of a direct-injection integrated structure and comprises a connecting section and a sound outlet section, and a loudspeaker is installed in the connecting section; the second end of the connecting section is connected with one end of the megaphone body, the first end of the sound outlet section is used as a sound outlet end of the megaphone, and the other end of the megaphone body is connected with the megaphone; the microphone includes the miaow head, and miaow head one end is located inside the casing of megaphone body, and the other end is located the casing outside of megaphone body, and the miaow head outside is provided with the miaow head apron, and it has the sound hole to open on the miaow head apron. The megaphone has the characteristics of miniaturization of equipment and convenience in use, can realize remote transmission of sound, has directivity in sound transmission, inhibits howling to a certain extent, improves sound pressure level, and has a good transmission effect.

Description

Megaphone

Technical Field

The utility model relates to the technical field of public address equipment, in particular to a megaphone.

Background

The megaphone is widely applied to various aspects of life due to the characteristics of simple structure, portability in holding and convenience in use. The megaphone has a sound amplification effect, so that the sound can be transmitted remotely, and people at a distance can know the sound amplification content more clearly. When the horn megaphone works, the electric signal that the megaphone sent produces magnetic field when the voice coil loudspeaker voice coil, this magnetic field and megaphone produce the interact from the magnetic field of taking the magnet to produce, and this interact makes the voice coil loudspeaker voice coil vibrate along with audio current power in megaphone magnetic field, when the voice coil loudspeaker voice coil vibrates together with the vibrating diaphragm, promotes the ambient air vibration and produces sound, and the sound of production propagates far away through the horn, has the directive property.

At present, the microphone directive property that megaphone on the market adopted is not strong, in order to improve the sound pressure level, makes people in distance clearly hear the sound content, needs to improve the gain, and when improving the gain, the sound that the speaker sent passes through the space and passes back to the microphone, produces acoustic feedback, has restrained the transmission of sound for the sound that megaphone sent is unclear, and in serious time, can damage the megaphone, causes economic loss.

SUMMERY OF THE UTILITY MODEL

At least one of the objects of the present invention is to overcome the problems of the prior art that the directivity of the microphone is not strong and the microphone howls, and to provide a microphone which improves the sound pressure level of the microphone and improves the sound production effect of the microphone by improving the directivity of the microphone and suppressing the howling.

In order to achieve the above object, the present invention adopts the following aspects.

A megaphone, the megaphone comprising: a horn, a megaphone body, a microphone, and a speaker; the horn is a direct-injection horn; the horn comprises a connecting section and a sound outlet section, wherein the first end of the connecting section is connected with the second end of the sound outlet section, the second end of the connecting section is connected with one end of the megaphone body, and the first end of the sound outlet section is used as a sound outlet; the loudspeaker comprises a loudspeaker body and a connecting section, wherein the connecting section is internally provided with an installation section, a first end of the installation section is connected with a second end of a sound outlet section, the second end of the installation section is positioned in the connecting section and is connected with a loudspeaker, and the other end of the loudspeaker body is connected with a microphone; the microphone comprises a microphone, one end of the microphone is located inside a shell of the microphone body, the other end of the microphone is located outside the shell of the microphone body, and a microphone cover plate is arranged outside the microphone.

Preferably, the miaow head apron is the cylindricality structure, and the side of miaow head apron is the arc, sets the side of miaow head apron into the arc, when external sound transmission to microphone department, takes place parabolic reflection in the side of miaow head apron for part sound is blockked by miaow head apron, has restrained acoustic feedback.

Preferably, the acoustic net is attached to the inner surface of the side surface of the microphone cover plate, sound reaching the bottom surface and the side surface of the microphone cover plate generates a phase difference through the filtering effect of the acoustic net, so that the microphone has high sound receiving degree in the direction from the bottom surface of the microphone cover plate and low sound receiving degree in the direction from the side surface of the microphone cover plate, and howling is suppressed.

The bottom surface and the side surface of the microphone cover plate are provided with sound outlet holes, so that sound can reach the microphone through the sound outlet holes conveniently.

Preferably, a gap of 3-5mm is reserved between the microphone cover plate and the microphone, so that a sound cavity with a certain distance is reserved between the microphone cover plate and the microphone, and the sound transmission effect is improved. The aperture of the sound outlet hole of the microphone cover plate is 1-2 mm.

Preferably, the miaow head is moving coil miaow head, and moving coil miaow head's directive property is good, and the stable performance can bear high acoustic pressure, and then when shouting to the distance under the condition that improves the sound pressure level, tone quality is clear, and the distortion is less.

Preferably, the length of the installation section is smaller than that of the connection section, so that a space is reserved in the connection section for installing the loudspeaker, the loudspeaker is installed in the connection section, the space of the megaphone body is not occupied, the size of the megaphone body can be reduced, the size of the whole megaphone is reduced, the overall structure of the megaphone is miniaturized, and the portability of the megaphone is improved; the length of the connecting section is smaller than that of the sound outlet section, and when the horn is connected to the megaphone body, the distance between the megaphone and the sound outlet of the horn is increased, so that howling can be inhibited; the internal diameter of installation section is greater than the external diameter of speaker radiation mouth for the radiation mouth of speaker is installed in the installation section, makes the sound that the speaker sent transmit to sound export section through the installation section, passes through sound export section again and transmits to the target location, reduces the sound wave loss, improves the transmission effect of sound.

Preferably, the connecting section, the mounting section and the sound outlet section are coaxially arranged to form a cavity structure with a closed side wall, so that sound emitted by the loudspeaker reaches the sound outlet section through the mounting section and is uniformly transmitted to the outside in the sound outlet section, the directivity of sound transmission is improved, the standing wave distortion of sound caused by reflection is reduced, and the transmission effect is improved.

Preferably, the second end of the connecting section is provided with a threaded hole, so that the horn and the megaphone body can be conveniently connected through screws or bolts; the junction of speaker and installation section is provided with the tensioning flange for the tensioning effect through the tensioning flange, the speaker fastening is in the installation section, prevents that the megaphone from rocking because of the installation insecure when using, influences the sound producing effect of speaker.

Preferably, the sensitivity of the loudspeaker is more than 90dB/W/m, the loudspeaker with the sensitivity more than 90dB/W/m is a high-sensitivity loudspeaker, the input power of the loudspeaker can be reduced by using the loudspeaker with the sensitivity more than 90dB/W/m, under the same input power, the sound output by the high-sensitivity loudspeaker is larger, the sound distortion can be reduced, and further the sound content can be clearly heard at a far distance; through using high sensitivity speaker, the effect that makes the sound that the speaker sent through the horn makes the maximum sound pressure level of megaphone not less than 141dB, and sound quality is good, and the loudness is high.

Preferably, the handle is installed to a side of megaphone body, sets up the handle on the megaphone body for the megaphone is held when using conveniently, improves the portability of megaphone.

In summary, due to the adoption of the technical scheme, the utility model at least has the following beneficial effects:

by adopting the direct-injection type horn, the standing wave distortion phenomenon generated by the sound wave after multiple reflections can be reduced, and the radiation efficiency of the sound is improved. The loudspeaker is arranged in the horn, so that the volume of the megaphone body connected with the horn can be reduced, the overall size of the whole megaphone equipment is reduced, and the whole megaphone equipment is favorably miniaturized; meanwhile, the length of the horn is lengthened, so that the distance between the microphone and the sound radiation port of the horn is increased, and squeal is reduced to a certain extent.

The microphone adopts the moving-coil type microphone, and the directive property of moving-coil type microphone is good, the stable performance, and frequency characteristic is good, can bear high acoustic pressure, and then when shouting to the distance under the condition that improves sound pressure level, tone quality is clear, and sound loudness is high, and the distortion is less.

The acoustic net is pasted on the inner surface of the side face of the microphone cover plate, so that phase difference is generated between sound transmitted in the front face and the side face direction of the microphone cover plate, the microphone only receives sound within a certain range, the purpose of suppressing squeaking is achieved, the sound pressure level of the microphone is improved, and the loudness of the sound is improved.

Through set up the handle on the megaphone body, make the megaphone hold when using and take the convenience.

Drawings

Fig. 1 is a schematic diagram of the structure of a megaphone according to an exemplary embodiment of the present invention.

Fig. 2 is a front view of the megaphone shown in fig. 1.

Fig. 3 is a cross-sectional view of the megaphone a-a shown in fig. 2.

Fig. 4 is a partial view of the megaphone shown in fig. 3.

Fig. 5 is a cross-sectional view of the megaphone B-B shown in fig. 2.

Fig. 6 is a sectional view of the horn structure of the megaphone shown in fig. 1.

Reference numerals: 1-horn, 101-connecting section, 1011-connecting section first end, 1012-connecting section second end, 102-sound outlet section, 1021-sound outlet section first end, 1021-sound outlet section second end, 103-mounting section, 1031-mounting section first end, 1032-mounting section second end, 104-threaded hole, 105-buffer section, 1051-buffer section first end, 1052-buffer section second end, 2-megaphone body, 3-microphone, 301-microphone, 302-microphone cover plate, 303-sound outlet hole, 4-loudspeaker, 5-handle, 6-tensioning flange.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and embodiments, so that the objects, technical solutions and advantages of the present invention will be more clearly understood. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

As shown in fig. 1, 2, 5, 6, the present invention provides a megaphone including a horn 1, a megaphone body 2, a microphone 3, and a speaker 4; the shell of the megaphone body 2 is of a cubic structure (can also be set to be a cylindrical structure), and the horn 1 is of a direct-injection integrated structure. The horn 1 comprises a connecting section 101 and a sound outlet section 102, a first end 1011 of the connecting section 101 is connected with a second end 1022 of the sound outlet section 102, a second end 1012 of the connecting section 101 is connected with one end of the megaphone body connection 2, and a first end 1021 of the sound outlet section 102 is used as a sound outlet of the megaphone; the connection section 101 is internally provided with a mounting section 103 and a buffer section 105, a first end 1031 of the mounting section 103 is connected with a second end 1052 of the buffer section 105, a first end 1051 of the buffer section 105 is connected with a second end 1022 of the sound outlet section 102 (the buffer section is not required, so that the first end 1031 of the mounting section 103 is directly connected with the second end 1022 of the sound outlet section), a second end 1032 of the mounting section 103 is positioned in the connection section 101 and is connected with the loudspeaker 4, and the other end of the megaphone body 2 is connected with the microphone 3.

As shown in fig. 3 and 4, microphone 3 includes microphone 301, microphone 301 one end is located inside the casing of microphone body 2, and the other end is located outside the casing of microphone body 2 to be provided with microphone apron 302 in the microphone outside, prevent that the dust from influencing the sensitivity of microphone, also can prevent to be just spit when microphone 3 shouts and wet the microphone, influence the sensitivity of microphone, microphone apron 302 is the cylindricality structure, sound hole 303 has all been opened to the bottom surface and the side on the microphone apron 302, can make the sound of sending pass through sound hole 303 and transmit to microphone 301 department, improves sound transmission efficiency.

A second end 1012 of the horn connecting section 101 is provided with a threaded hole 104 (a plurality of threaded holes can be arranged and uniformly distributed on the second end to enhance the connecting strength), so that the horn 1 can be conveniently installed on the megaphone body 2 by using screws or bolts; the total length of the mounting section 103 and the buffer section 105 of the horn is smaller than that of the connecting section 101, so that a space is reserved in the connecting section 101 for mounting the loudspeaker; the loudspeaker is arranged in the connecting section 101 of the horn, so that the volume of the megaphone body 2 connected with the horn can be reduced, and the megaphone equipment is favorably miniaturized; the connecting section 101 length of horn is less than sound outlet section 102 length, through the length of extension sound outlet section 102, has increased the whole length of horn, when the horn was installed on the megaphone, has increased the distance of microphone and horn radiation mouth, can reduce to a certain extent and whistle.

A tensioning flange 6 is arranged at the joint of the loudspeaker 4 and the mounting section 103; make speaker 4 and erection segment 103 fastening connection through setting up the tensioning flange, through the tensioning effect, prevent that the junction of speaker 4 and erection segment 103 is not hard up, influences the sound production effect.

The installation section 103, the buffer section 105 and the sound outlet section 102 are coaxially arranged to form a cavity structure with a closed side wall, so that sound emitted by the loudspeaker reaches the sound outlet section 102 through the installation section 103 and the buffer section 105, and is uniformly transmitted to the outside in the sound outlet section 102, the directivity of sound transmission is improved, the standing wave distortion of the sound caused by reflection is reduced, and the transmission effect is improved. The inner diameter of the mounting section 103 is larger than the outer diameter of the radiation port of the loudspeaker 4, so that the radiation port of the loudspeaker 4 is mounted in the mounting section 103, and the sound emitted by the loudspeaker is transmitted to the sound outlet section 102 through the mounting section 103 and then transmitted to a target position through the sound outlet section 102, thereby reducing the sound wave loss, improving the sound transmission effect and reducing the sound distortion phenomenon; the narrow caliber of the mounting section 103 reduces the sectional area of the air flow, and improves the sound radiation efficiency of the loudspeaker diaphragm.

In a preferred embodiment, the sensitivity of the loudspeaker 4 is greater than 90dB/W/m, the loudspeaker with the sensitivity greater than 90dB/W/m is a high-sensitivity loudspeaker, the input power of the loudspeaker can be reduced by using the loudspeaker with the sensitivity greater than 90dB/W/m, under the same input power, the sound output by the high-sensitivity loudspeaker is larger, the sound distortion can be reduced, and the sound content can be clearly heard at a far distance; through using high sensitivity speaker, the effect that makes the sound that the speaker sent through the horn makes the maximum sound pressure level of megaphone not less than 141dB, and sound quality is good, and the loudness is high.

A gap of 3-5mm is reserved between the microphone cover plate 302 and the microphone 301, so that a sound cavity with a certain distance is reserved between the microphone cover plate 302 and the microphone 301, and the sound transmission effect is improved; the side of the microphone cover 302 is arc-shaped, and when external sound is transmitted to the microphone 3, parabolic reflection occurs at the side of the microphone cover 302, so that part of the sound is blocked by the microphone cover 302, and acoustic feedback is suppressed.

Further, the aperture of the sound outlet hole 303 is 1-2 mm.

The inner surface of the side surface of the microphone cover plate 302 can be provided with an acoustic net, when the shouting sound reaches the microphone 3, the shouting sound reaches the microphone through the sound outlet holes 302 on the bottom surface and the side surface of the microphone cover plate 302, at the moment, the sound on the side surface of the microphone cover plate 302 is filtered by the acoustic net, so that the sound on the bottom surface and the side surface of the microphone cover plate 302 generates a phase difference, the sound generating the phase difference forms phase interference at the vibrating diaphragm of the microphone 301, the sound is attenuated, and the microphone 301 has high sound receiving degree from the bottom surface of the microphone cover plate and small sound receiving degree from the side surface direction of the microphone cover plate; when the acoustic net blocks the sound from the side surface of the microphone cover plate, the microphone 301 only receives the sound from the bottom surface direction of the microphone cover plate, so that the directivity of the sound is improved, the howling is further inhibited, and the transmission effect of the sound is improved; when improving sound directive property, increased the distance of sound source and microphone 3 for microphone 3 need not be pressed close to the sound source, when sounding in 0 ~ 50cm apart from miaow head cover 302 bottom surface, the sound effect that the megaphone sent is equally good.

Microphone's miaow head 301 can adopt the moving coil miaow head, and the directive property of moving coil miaow head is good, stable performance, and frequency characteristic is good, can bear high acoustic pressure, and then when shouting far away under the circumstances that improves the sound pressure level, tone quality is clear, and sound loudness is high, and the distortion is less.

In a preferred embodiment, the horn is a direct-emitting horn, and the sound emitted from the loudspeaker diaphragm reaches the sound outlet section 102 through the mounting section 103 and the buffer section 105, and is directly transmitted out in the sound outlet section 102 without reflection; the direct-emitting horn is adopted, so that standing wave loss caused by multiple reflections of sound can be reduced, the radiation efficiency of the sound is improved, and the sound pressure level of the megaphone is improved; simultaneously, when preventing to whistle and handle, the distance that only needs to increase microphone and sound export through the sound export section 102 length of extension horn, need not increase the volume of the megaphone body of being connected with the horn to make the whole volume of megaphone reduce, make the megaphone use, carry more convenient.

In a preferred embodiment, a handle 5 is mounted on one side of the megaphone body 2 to facilitate holding the megaphone in use.

The megaphone has the characteristics of miniaturization of equipment and convenience in holding, the overall size of the megaphone is smaller than 400mm (length) 200mm (width) 200mm (height), and the weight of the megaphone is smaller than 2.3 kg. The megaphone is suitable for occasions needing sound amplification, and can realize long-distance transmission with the sound transmission distance larger than 1000m in open space; through the horn effect, the sound transmission has directivity and the transmission effect is good; the microphone cover plate is arranged at the microphone, and the acoustic net is arranged on the inner surface of the microphone cover plate, so that the directivity of the microphone is improved, squeaking is inhibited to a certain degree, and the sound pressure level is improved; the maximum sound pressure level of the megaphone is not less than 141dB, and when the megaphone is used for long-distance megaphone, the sound quality distortion degree is small, and the sound is clear. When using, hand megaphone, select the target location, to microphone sound production in 0 ~ 50cm apart from miaow head apron bottom surface, sound changes the signal of telecommunication through the microphone, the signal of telecommunication is enlargied through the megaphone body (this internal power that is provided with of megaphone, power amplifier, devices such as player), change into acoustic signal through the speaker again, acoustic signal radiates to the target location through the horn and can call the target location, when the definition that needs improve sound, can increase the volume of sound source, improve the sound pressure level of megaphone. When the loudspeaker is used, the function can be adjusted through the keys on the loudspeaker body according to the actual use condition. The megaphone body passes through screw or bolt can dismantle the connection with the horn, when carrying, can unpack megaphone body and horn apart, installs on the use scene, improves the portability of megaphone.

The foregoing is merely a detailed description of specific embodiments of the utility model and is not intended to limit the utility model. Various alterations, modifications and improvements will occur to those skilled in the art without departing from the spirit and scope of the utility model.

Claims (10)

1. A megaphone, comprising: a horn, a megaphone body, a microphone, and a speaker; the horn is a direct-injection horn; the horn comprises a connecting section and a sound outlet section, wherein the first end of the connecting section is connected with the second end of the sound outlet section, the second end of the connecting section is connected with one end of the megaphone body, and the first end of the sound outlet section is used as a sound outlet of the megaphone; the loudspeaker comprises a loudspeaker body and a connecting section, wherein the connecting section is internally provided with an installation section, a first end of the installation section is connected with a second end of a sound outlet section, the second end of the installation section is positioned in the connecting section and is connected with a loudspeaker, and the other end of the loudspeaker body is connected with a microphone; the microphone comprises a microphone, one end of the microphone is located inside a shell of the microphone body, the other end of the microphone is located outside the shell of the microphone body, and a microphone cover plate is arranged outside the microphone.

2. The microphone of claim 1 wherein the microphone cover plate is cylindrical and the side of the microphone cover plate is arcuate.

3. The megaphone of claim 1 wherein the inner surface of the side of the microphone cover is attached with an acoustic net, and the bottom and side of the microphone cover are provided with sound holes.

4. The megaphone as claimed in claim 3, wherein a gap of 3-5mm is left between the cover plate and the microphone, and the aperture of the sound outlet hole is 1-2 mm.

5. The megaphone of claim 1, wherein the microphone is a moving coil microphone.

6. A megaphone in accordance with any one of claims 1 to 5, wherein the mounting section length is less than the connecting section length, the connecting section length is less than the sound outlet section length, and the inner diameter of the mounting section is greater than the outer diameter of the speaker radiation port.

7. The megaphone as claimed in any one of claims 1 to 5, wherein the connecting section, the mounting section and the sound outlet section are coaxially arranged in a cavity structure with closed side walls.

8. The megaphone as claimed in any one of claims 1 to 5, wherein the second end of the connecting section is provided with a threaded hole, and a tension flange is arranged at the connection position of the loudspeaker and the mounting section.

9. A megaphone as claimed in any one of claims 1 to 5, wherein the sensitivity of the loudspeaker is greater than 90 dB/W/m.

10. A megaphone as claimed in any one of claims 1 to 5, wherein a handle is mounted on one side of the megaphone body.

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