Small-size walkie-talkie

Abstract

Provided is a small-size walkie-talkie, which comprises a casing, a circuit board, a walkie-talkie module, a battery, and an antenna, the circuit board being electrically connected to the walkie-talkie module, the battery, and the antenna; the circuit board is fixed in the casing, and the antenna is close to an inner wall of the casing; the antenna and the circuit board are placed at an interval; the battery is flat and is stacked with the circuit board; and the overall size of the casing is constrained in a space having a range of 70 mm * 70 mm * 40 mm. In the present invention, the arrangement of the antenna, the circuit board, and the battery is integrated in the walkie-talkie, and the positions of the electronic components are logically designed, such that the functions of the walkie-talkie are implemented using a more compact and concise design solution, thereby reducing the overall size of the walkie-talkie, and improving the portability of the walkie-talkie and user experience.

Description

A small-sized walkie-talkie Technical Field

[0001] The present invention relates to the field of intercoms, and in particular to a small-sized intercom. Background Art

[0002] A walkie-talkie is a point-to-multipoint communication terminal device, enabling multiple people to communicate simultaneously. Despite the continuous advancement of communication equipment, walkie-talkies, as a convenient communication tool, continue to play a vital role in our daily lives. Compared to other communication methods, walkie-talkies offer instant communication, a single call with hundreds of responses, economical and practical features, low operating costs, no call charges, and ease of use. They also feature group calling, system calling, and confidential calling. Their role in handling emergencies and conducting dispatch and command operations is irreplaceable.

[0003] However, with technological advancements and the increasing demand for portability, technical challenges associated with the large size of walkie-talkies have gradually emerged. The main reason for the large size of walkie-talkies is the internal components, such as the circuit board, antenna, and battery. To achieve better communication and longer talk time, walkie-talkies require large batteries, while the antenna requires ample space to ensure signal reception and transmission. Furthermore, traditional circuit board designs also result in a larger size. These issues have resulted in existing walkie-talkies being larger and less portable.

[0004] Large-sized walkie-talkies are not only inconvenient to carry around, but also make people feel tired when carried for a long time. In addition, the excessive size and weight may make the performance of the walkie-talkie unstable and affect the communication effect.

[0005] Summary of the Invention

[0006] In view of the problems existing in the prior art, the present invention provides a small-sized intercom. The specific technical solution is as follows:

[0007] A small-sized intercom comprises a housing, a circuit board, an intercom module, a battery and an antenna, wherein the circuit board electrically connects the intercom module, the battery and the antenna;

[0008] The circuit board is located inside the housing, the antenna is close to the inner wall of the housing, and there is a gap between the antenna and the circuit board;

[0009] The battery is flat and arranged in a stacked manner with the circuit board;

[0010] The overall size of the housing is constrained within a space of 70 mm*70 mm*40 mm.

[0011] In a specific embodiment, the antenna is disposed on one side of the circuit board and extends in substantially the same direction as the circuit board, and the distance between the antenna and the circuit board is within a range of 2 mm to 18 mm.

[0012] In a specific embodiment, the antenna is located around the circuit board, and the distance between the antenna and the circuit board or the battery is within 2 mm-15 mm.

[0013] In a specific embodiment, the device further includes a speaker, a microphone, and a first button, wherein the circuit board is electrically connected to the speaker, the microphone, and the first button, and the first button protrudes relative to the circuit board toward the antenna;

[0014] The area on the shell directly above the first button is a pressing area, and a pressing portion connected to the first button extends from the inner wall of the pressing area toward the circuit board. The pressing portion is used to press the first button when the pressing area is pressed by external force.

[0015] In a specific embodiment, the housing includes a side housing and an upper housing and a lower housing respectively connected to the side housing, the side housing is located between the upper housing and the lower housing; the lower housing is used to be close to the user when the user wears it;

[0016] The antenna is close to the upper shell or is arranged on the upper shell;

[0017] The microphone and the speaker are close to the side housing or the upper housing.

[0018] In a specific embodiment, the circuit board is also electrically connected to an interface, and the interface is located on the side housing or the lower housing.

[0019] In a specific embodiment, it further includes a second button electrically connected to the circuit board, and the second button is distributed on the side housing.

[0020] In a specific embodiment, the speaker is arranged perpendicular to the circuit board, and the rear sound cavity of the speaker is close to the circuit board, and the front sound cavity is close to the inner wall of the shell.

[0021] In a specific embodiment, an inner bracket is further included in the shell, and the inner bracket is connected to the circuit board and is used to mount the circuit board inside the shell.

[0022] In a specific embodiment, the shape of the upper shell and / or the lower shell includes a rectangular shape and a circular shape, and all or part of the side shell is arc-shaped.

[0023] In a specific embodiment, it further includes: a speaker and a microphone;

[0024] The shell has a mutually orthogonal thickness direction, height direction and width direction, wherein the thickness direction is defined as the direction closer to or farther from the side of the human body when worn; the height direction is defined as the direction in which the head and feet of the human body extend; and the width direction is perpendicular to the height direction.

[0025] The shell has a wearing surface close to the human body along the thickness direction and a pressing surface away from the human body along the thickness direction;

[0026] When worn, the vibration directions of the speaker and the microphone are between the height direction and the width direction, and the speaker and the microphone are both facing the head position of the human body.

[0027] In a specific embodiment, the housing further comprises a connecting surface connecting the wearing surface and the pressing surface;

[0028] The connecting surface is provided with sound outlet holes and sound receiving holes. The sound outlet holes are distributed in the vibration direction of the speaker, and the sound receiving holes are distributed in the vibration direction of the microphone.

[0029] In a specific embodiment, in the wearing state, when viewed along the thickness direction, the angle between the extension direction of the sound outlet of the speaker and the height direction is between 0 degrees and 63.5 degrees;

[0030] When viewed along the width direction, an angle between the extension direction of the sound outlet of the speaker and the height direction is between 0 degrees and 80.5 degrees.

[0031] In a specific embodiment, the speaker and the microphone are disposed in the housing, and the speaker and the microphone are located on the same side;

[0032] A lanyard hole for connecting a lanyard is provided on one side of the housing where the speaker and the microphone are distributed;

[0033] The housing is provided with a back clip and / or a magnetic module;

[0034] The magnetic module includes a magnetic block provided on the housing and a magnetic seat provided corresponding to the magnetic block;

[0035] The back clip and the magnetic module are used to realize different wearing methods of the walkie-talkie.

[0036] In a specific embodiment, the sound outlet of the speaker and the sound receiving hole of the microphone are oriented in different directions, and the sound propagation path of the speaker and the sound receiving path of the microphone are different;

[0037] The number of the sound holes includes one or more, and the sound holes are staggered in an upper and lower manner;

[0038] The housing is further provided with a plurality of cavities, wherein the speaker and the microphone are provided in different cavities;

[0039] The size of the cavity in which the loudspeaker is arranged gradually decreases along the sound propagation direction; the size of the cavity in which the microphone is arranged gradually increases along the sound propagation direction.

[0040] In a specific embodiment, the invention comprises a flat housing and a speaker arranged in the housing;

[0041] The housing includes a wearing surface for being worn on a human body, a pressing surface opposite to the wearing surface, and a connecting surface connecting the wearing surface and the pressing surface, wherein the pressing surface or the connecting surface is provided with a sound outlet, and the speaker is connected to the circuit board and emits sound toward the sound outlet;

[0042] A first space is formed directly above the circuit board and the pressing surface, and a second space is formed directly below the circuit board and the wearing surface. The rear sound cavity located at the rear of the speaker is set in the first space and / or the second space, and the volume of the rear sound cavity is greater than 0.5cc and less than 8cc.

[0043] In a specific embodiment, the distance from the wearing surface to the pressing surface is greater than 6 mm and less than 35 mm.

[0044] In a specific embodiment, the housing is further provided with an inner bracket and an antenna, the antenna is electrically connected to the circuit board, and the inner bracket is used to set up the antenna in the first space;

[0045] The inner bracket connects the edge of the circuit board and the inner wall of the housing, the speaker is located in the inner bracket, and a front sound cavity is formed between the front of the speaker and the inner bracket;

[0046] A battery for power supply is also provided in the housing, and the battery is located in the second space.

[0047] In a specific embodiment, a microphone is also provided in the shell, a sound receiving cavity is formed between the inner bracket and the inner wall of the shell, the microphone is located in the sound receiving cavity, and a sound receiving hole is provided in the shell corresponding to the sound receiving cavity; the sound receiving hole is located on the pressing surface or the connecting surface.

[0048] In a specific embodiment, the sound receiving hole is used to direct the sound receiving direction of the microphone toward the user's mouth area, and the sound outlet hole is used to direct the sound emitting direction of the speaker toward the user's ear;

[0049] The housing is further provided with a first button and a second button electrically connected to the circuit board, wherein the first button faces the pressing surface and the second button faces the connecting surface. Beneficial effects:

[0050] The present invention provides a small-sized walkie-talkie. By integrating the arrangement of the walkie-talkie's internal antenna, circuit board, docking module and battery, and rationally designing the position of electronic components, the functions of the walkie-talkie are realized in a more compact and simple design scheme, thereby reducing the overall size of the walkie-talkie and improving the portability and user experience of the walkie-talkie.

[0051] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0053] FIG1 is a schematic diagram of a circular structure of an intercom according to the present invention;

[0054] FIG2 is a schematic diagram of the square structure of the intercom of the present invention;

[0055] FIG3 is a schematic diagram of the interior of a circular structure of the present invention;

[0056] FIG4 is a schematic diagram of the interior of the square structure of the present invention;

[0057] FIG5 is a side sectional view of the intercom of the present invention;

[0058] FIG6 is a perspective schematic diagram of an intercom according to an embodiment;

[0059] FIG7 is a cross-sectional view of an intercom according to an embodiment;

[0060] FIG8 is a top view of an intercom according to an embodiment;

[0061] FIG9 is a perspective schematic diagram of an intercom according to an embodiment;

[0062] FIG10 is a cross-sectional view of an intercom according to an embodiment;

[0063] FIG11 is a top view of an intercom according to an embodiment;

[0064] FIG12 is a side view of an embodiment;

[0065] FIG13 is a side view of an embodiment;

[0066] FIG14 is a diagram showing a walkie-talkie wearing embodiment;

[0067] FIG15 is a second diagram of wearing a walkie-talkie according to an embodiment;

[0068] Figure 16 is a diagram showing the third embodiment of the walkie-talkie wearing method;

[0069] FIG17 is a fourth diagram of wearing a walkie-talkie according to an embodiment;

[0070] FIG18 is a schematic diagram of a transverse cross-sectional structure of a first embodiment of the present invention;

[0071] FIG19 is a schematic diagram of a vertical cross-sectional structure of a first embodiment of the present invention;

[0072] FIG20 is a schematic diagram of a vertical cross-sectional structure of a second embodiment of the present invention;

[0073] FIG. 21 is a schematic structural diagram of a pressing surface in a second embodiment of the present invention.

[0074] Reference numerals:

[0075] 1-shell; 101-pressing surface; 102-wearing surface; 103-connecting surface; 2-inner bracket; 3-circuit board; 301-sound outlet; 302-sound receiving hole; 4-battery; 41-cavity; 5-speaker; 51-lanyard hole; 6-microphone; 61-back clip; 7-antenna; 71-magnetic seat; 8-first button; 9-second button; 9a-first space; 10a-second space; 11-upper shell; 12-lower shell; 12a-rear sound cavity; 13-side shell; 14-pressing area; 14a-front sound cavity; 15-pressing part; 16-sound receiving cavity. DETAILED DESCRIPTION

[0076] Hereinafter, various embodiments of the present disclosure will be described more fully. The present disclosure may have various embodiments, and adjustments and changes may be made therein. However, it should be understood that there is no intention to limit the various embodiments of the present disclosure to the specific embodiments disclosed herein, but rather that the present disclosure should be construed to encompass all adjustments, equivalents, and / or alternatives falling within the spirit and scope of the various embodiments of the present disclosure.

[0077] Hereinafter, the terms "include" or "may include" as used in various embodiments of the present disclosure indicate the presence of disclosed functions, operations, or elements, and do not limit the addition of one or more functions, operations, or elements. In addition, as used in various embodiments of the present disclosure, the terms "include," "have," and their cognates are intended only to indicate specific features, numbers, steps, operations, elements, components, or combinations of the foregoing, and should not be understood as excluding the presence of one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing, or the possibility of adding one or more features, numbers, steps, operations, elements, components, or combinations of the foregoing.

[0078] In various embodiments of the present disclosure, the expression "or" or "at least one of A or / and B" includes any or all combinations of the words listed simultaneously. For example, the expression "A or B" or "at least one of A or / and B" may include A, may include B, or may include both A and B.

[0079] The expressions (such as "first", "second", etc.) used in the various embodiments of the present disclosure may modify the various constituent elements in the various embodiments, but may not limit the corresponding constituent elements. For example, the above expressions do not limit the order and / or importance of the elements. The above expressions are only used to distinguish one element from other elements. For example, a first user device and a second user device indicate different user devices, although both are user devices. For example, without departing from the scope of the various embodiments of the present disclosure, a first element may be referred to as a second element, and similarly, a second element may also be referred to as a first element.

[0080] It should be noted that when a component is described as being “connected” to another component, the first component may be directly connected to the second component, and a third component may be “connected” between the first and second components. Conversely, when a component is described as being “directly connected” to another component, it can be understood that there is no third component between the first and second components.

[0081] The term “user” used in various embodiments of the present disclosure may indicate a person using an electronic device or a device (eg, an artificial intelligence electronic device) using the electronic device.

[0082] The terms used in the various embodiments of the present disclosure are only used to describe the purpose of specific embodiments and are not intended to limit the various embodiments of the present disclosure. As used herein, the singular form is intended to also include the plural form, unless the context clearly indicates otherwise. Unless otherwise specified, all terms used herein (including technical terms and scientific terms) have the same meaning as those generally understood by those skilled in the art to which the various embodiments of the present disclosure belong. The terms (such as those defined in generally used dictionaries) will be interpreted as having the same meaning as the contextual meaning in the relevant technical field and will not be interpreted as having an idealized meaning or an overly formal meaning, unless clearly defined in the various embodiments of the present disclosure.

[0083] Example 1

[0084] In response to the shortcomings of the existing technology, this embodiment provides a small-sized walkie-talkie, which reduces the overall size of the walkie-talkie and improves the portability and user experience of the walkie-talkie. The structure of the walkie-talkie is shown in Figures 1-5 of the specification, and the specific solution is as follows:

[0085] A small-sized intercom comprises a housing 1, a circuit board 3, an intercom module and a battery 4 connected to the circuit board 3, wherein the intercom module is integrated on the circuit board 3 and is therefore not shown in the accompanying drawings. Preferably, an inner bracket 2 is further provided inside the housing 1. The battery 4 and the circuit board 3 are located in the inner space of the housing 1 and can be fixed by the inner bracket 2 or directly connected and fixed to the inner wall of the housing 2. The shape of the housing 1 is arbitrary. In the accompanying drawings 1 and 2 of the specification, schematic diagrams are respectively given in which the main view is circular and the main view is rectangular. In this embodiment, a series of electronic components such as a speaker 5, a microphone 6, an antenna 7, an interface, and buttons are electrically connected to the circuit board 3. The circuit board 3 can use a highly integrated chip to simplify the circuit structure. Devices such as the antenna 7, the speaker 5 and the microphone 6 can be placed close to the inner wall of the housing 1 under the support of the inner bracket 2.

[0086] The battery 4 is a flat structure and is stacked with the circuit board 3. This ensures that the internal space of the housing 1 is properly arranged while ensuring the storage of electrical energy, thereby further reducing the size of the intercom.

[0087] In this embodiment, the internal structure of the intercom is optimized to achieve its basic functions in a more compact and concise design. This allows the overall size of the housing 1 to be constrained to a spatial range of 70mm * 70mm * 40mm. This 70mm * 70mm * 40mm form a rectangular parallelepiped structure, which can be understood as the minimum circumscribed rectangular parallelepiped of the intercom. This is merely a dimensional limitation and does not necessarily imply that the intercom of this application must be rectangular. In other words, the intercom of this embodiment can be of any shape, but the volume must be smaller than the 70mm * 70mm * 40mm range. The 70mm * 70mm size is based on the gripping area of ​​the human hand. When using an intercom, not only is user experience important, but also ensuring a secure grip and preventing it from slipping. Normally, users tend to grip objects using the upper middle area of ​​the palm and the base joints of the middle three fingers. This grip is most comfortable and prevents slipping. The palm width of an adult male is approximately between 75 mm and 100 mm, while the palm width of an adult female is usually between 65 mm and 85 mm. 70 mm*70 mm can cover the palm width of most users.

[0088] For the convenience of description, the shell 1 is divided into three parts: an upper shell 11, a lower shell 12 and a side shell 13. The side shell 13 is located between the upper shell 11 and the lower shell 12, and is connected to the upper shell 11 and the lower shell 12 respectively. When the user wears it, the lower shell 13 will fit the user and be closer to the user than the upper shell 11. The material of the shell 1 can be selected from the materials commonly used in walkie-talkies. In Figure 3, the upper shell 11 and / or the lower shell 12 are circular and have a diameter of less than 70 mm. In Figure 4, the upper shell 11 and / or the lower shell 12 are square and have a length of no more than 70 mm and a width of no more than 60 mm. Preferably, in order to further reduce the volume and improve the grip of the walkie-talkie, all or part of the side shell 13 is set to be arc-shaped.

[0089] In this embodiment, two possible arrangements exist for the antenna 7 and the circuit board 3. One is that the antenna 7 and the circuit board 3 are located on separate planes and arranged parallel to each other; the other is that the antenna 7 and the circuit board 3 are located on the same plane and around the circuit board 3. Both arrangements require a distance between the antenna 7 and the circuit board 3. In practical applications, to ensure the communication bandwidth of the walkie-talkie, the antenna 7 needs to be designed to be long. If it is integrated into the circuit board 3, it will inevitably increase the layout difficulty and the size of the walkie-talkie. Moreover, radiation from the circuit board 3 will interfere with the operation of the antenna 7. Therefore, in this embodiment, the antenna 7 needs to be spaced apart from the circuit board 3.

[0090] In one embodiment, the antenna 7 is located on one side of the circuit board 3, and the two extend in substantially the same direction, for example, arranged in parallel with a gap, as shown in Figure 5. The circuit board 3 is supported by the inner bracket 2 and is located within the interior space of the housing 1. The plane on which the circuit board 3 is located divides the interior space of the housing 1 into two parts, one of which is provided with the antenna 7 and the other is provided with the battery. The antenna 7 is built-in and has a planar structure, arranged parallel to the circuit board 3, thereby optimizing the design of the antenna 7, improving the gain and efficiency of the antenna 7, and reducing the size of the antenna 7. The battery is a flat structure and occupies a different space from the antenna 7. The design of the battery compartment is optimized, allowing the battery 4 to be placed more compactly, thereby reducing the thickness of the walkie-talkie.

[0091] In FIG5 , antenna 7 uses circuit board 3 as a reference plane. The distance between antenna 7 and circuit board 3 cannot be too close, otherwise it will block the signal, particularly negatively impacting the transmission of short-wavelength signals (RF), thus affecting the transmission of antenna 7. Therefore, in this embodiment, the distance between antenna 7 and circuit board 3 is limited. Specifically, the distance between the plane of antenna 7 closest to circuit board 3 and the plane of circuit board 3 closest to antenna 7 is between 2 mm and 18 mm. This distance is shown in FIG5 , B. Experimental verification has shown that 2 mm is the maximum distance between antenna 7 and circuit board 3. While it negatively impacts RF signal transmission, it allows for substantial signal transmission. Exceeding this limit prevents full signal transmission. The value of 18 mm is calculated by subtracting the thicknesses of the upper and lower housings 11 and 12, the thickness of the circuit board 3, the thickness of the battery 4, and the heat dissipation distance between the battery 4 and the lower housing 12 from the maximum thickness of the walkie-talkie.

[0092] In another embodiment, antenna 7 is positioned around circuit board 3. If the two are in the same plane, this solution will inevitably increase the width of the walkie-talkie. In this case, the distance between antenna 7 and circuit board 3 or battery 4 must be between 2 and 15 mm. 2 mm is also the maximum distance between antenna 7 and circuit board 3 or battery 4, and will negatively impact RF signal transmission, but it will generally ensure signal transmission. Beyond this limit, complete signal transmission is impossible. 15 mm is a consideration for the width of the walkie-talkie, ensuring it does not exceed 70 mm.

[0093] In Figures 1 and 2 , the outer surface of the intercom is provided with a pressable pressing area 14. A button is connected below this pressing area 14. Pressing this area activates intercom communication. Specifically, the intercom of this embodiment also includes a first button 8, which is electrically connected to the circuit board 3 and protrudes relative to the circuit board 3 toward the antenna 7. The area on the housing 1 directly above the first button 8 is the pressing area 14. Extending from the inner wall of the pressing area 14 toward the circuit board 3 is a pressing portion 15 connected to the first button 8. This pressing portion 15 is designed to activate the first button 8 when pressed by an external force. The structure of the pressing portion 15 is shown in Figure 5 . Multiple buttons can be positioned below the pressing area 14. In Figures 2 and 4 , the pressing area 14 corresponds to a button for intercom communication and a button for volume control. In actual use, buttons with different functions can be integrated according to actual circumstances. The pressing area 14 has a wide pressable range, making it convenient for users to press.

[0094] Due to the presence of pressing area 14, the material of housing 1 in this area is elastic. To prevent pressure on internal circuitry, this embodiment provides a pressing portion 15 between pressing area 14 and first button 8. This portion acts as an extension of pressing area 14, separating pressing area 14 from circuit board 3. To prevent pressure on antenna 7, a notch is preferably provided near antenna 7. This notch notches not only reduces the obstruction of antenna 7 by housing 1 but also prevents pressure on antenna 7. The notch is illustrated in area A of FIG5 . Specifically, a portion of antenna 7 is located directly below pressing area 14. The notch is provided near antenna 7 to provide a flexible space when pressed, preventing contact between pressing area 14 and antenna 7. If no internal bracket is present, the notch may be omitted.

[0095] In this embodiment, essential electronic components, such as the microphone 6, speaker 5, and buttons, are strategically positioned. For example, the antenna 7 is positioned near or on the upper housing 11; the microphone 6 and speaker 5 are positioned near the side housing 13 and the upper housing 11, enabling wider-angle and multi-directional sound transmission. Given the compact size of this embodiment, the intercom can be handheld or clipped onto clothing. Attaching the speaker 5 and microphone 6 to the side housing 13 allows for wider sound transmission, enhancing the user experience.

[0096] For example, the circuit board 3 is also electrically connected with an interface, which is located on the side housing 13 to facilitate data transmission and power transmission. In addition, the interface can also be set on the lower housing 12.

[0097] In addition, the intercom of this embodiment places other function keys, such as the power button and pairing button, on the side housing 13, while retaining the first buttons 8, such as the intercom button, on the upper housing 11. Specifically, the intercom also includes a second button 9 electrically connected to the circuit board 3 and distributed on the housing 1. The first and second buttons 8, 9 are divided by area, not by function. All buttons on the upper housing 11 are referred to as first buttons 8, and all buttons on the side housing 13 are referred to as second buttons 9. The allocation of first and second buttons 8, 9 can be flexibly set according to actual application.

[0098] Regarding the specific arrangement of the speaker 5 and the microphone 6. For example, the speaker 5 is arranged perpendicular to the circuit board 3, and the rear sound cavity of the speaker 5 is close to the circuit board 3, and the front sound cavity is close to the inner wall of the shell 1. In this embodiment, the interior of the intercom is not strictly sealed, and the rear sound cavity of the speaker 5 does not independently open up a sealed space, so that the speaker 5 can use the remaining space inside as the rear sound cavity, while ensuring the acoustic characteristics of the speaker 5 and reducing the volume of the intercom. The front sound cavity can be formed by appropriately maintaining a certain distance from the inner wall of the shell 1. Preferably, the speaker 5 and the microphone 6 can share a sound cavity, or they can set the sound cavity separately.

[0099] The present invention provides a small-sized walkie-talkie. By integrating the layout of the walkie-talkie's internal antenna, circuit board, and battery, and rationally designing the positions of electronic components such as speakers and microphones, the functions of the walkie-talkie are realized in a more compact and simple design, thereby reducing the overall size of the walkie-talkie and improving the portability and user experience of the walkie-talkie.

[0100] Example 2

[0101] This embodiment also provides another small-sized intercom, comprising a housing 1, a circuit board 3, an intercom module, and a battery 4 connected to the circuit board 3.

[0102] Also includes: a speaker 5 and a microphone 6;

[0103] The speaker 5 may be a horn; the housing 1 has mutually orthogonal thickness, height, and width directions, wherein the thickness direction is defined as the direction toward or away from the human body when worn; the height direction is defined as the direction extending from the head and feet of the human body; and the thickness direction is perpendicular to the height direction and the width direction respectively.

[0104] Specifically, as shown in Figures 6 to 17, the thickness direction is the Z-axis direction shown in the coordinate axis of the figure, the height direction is the Y-axis direction shown in the coordinate axis, and the width direction is the X-axis direction shown in the coordinate axis;

[0105] As shown in FIG6 to FIG9, the housing 1 has a wearing surface 102 close to the human body along the thickness direction and a pressing surface 101 away from the human body along the thickness direction;

[0106] When worn, the vibration direction of the speaker 5 and the microphone 6 is between the height direction and the width direction, and is toward the head position of the human body.

[0107] The orientation of the loudspeaker 5 helps reduce the scattering and attenuation of sound in the air, thereby improving the clarity and accuracy of the sound; and also helps reduce the interference of ambient noise on sound transmission.

[0108] As for the microphone 6, the microphone 6 mainly receives the sound from the direction it is facing rather than the noise of the surrounding environment.

[0109] Furthermore, as shown in FIG7 and FIG10 , the housing 1 further comprises a connecting surface 103 connecting the wearing surface 102 and the pressing surface 101 ; a sound outlet 301 and a sound receiving hole 302 are provided on the connecting surface 103 , the sound outlet 301 is provided in the vibration direction of the speaker 5 , and the sound receiving hole 302 is provided in the vibration direction of the microphone 6 ;

[0110] In the wearing state, as shown in FIG14 and FIG15 , when viewed along the thickness direction, the angle between the extension direction of the sound outlet 301 of the speaker 5 and the height direction is between 0 degrees and 63.5 degrees;

[0111] As shown in FIG. 14 , when viewed along the width direction, the angle between the extension direction of the sound outlet 301 of the speaker 5 and the height direction is between 0 degrees and 80.5 degrees.

[0112] In the above range, the propagation effect of the loudspeaker 5 is relatively good, which helps to optimize the user experience and ensures that the sound is relatively clear and the sound quality is relatively good.

[0113] Furthermore, as shown in FIG7 and FIG10 , the speaker 5 and the microphone 6 are arranged on the same side;

[0114] On the one hand, it can solve the problem of echo and howling caused by sound propagation in the air when the speaker 5 and the microphone 6 are close to each other but located on different connection surfaces 103; arranging the speaker 5 and the microphone 6 on the same side can reduce echo and howling, providing clearer voice transmission;

[0115] On the other hand, the speaker 5 and microphone 6 are arranged on the same side, which is convenient for the user to operate and control: when wearing it, the user can more naturally face the speaker 5 and microphone 6 towards himself, which is convenient to use without excessive posture adjustment, thereby improving the user experience;

[0116] On the other hand, arranging the loudspeaker 5 and the microphone 6 on the same side can also help optimize the spatial layout and design of the intercom, making the intercom thinner and more portable.

[0117] Furthermore, as shown in FIG8 , a lanyard hole 51 for connecting a lanyard is provided on one side of the housing 1 where the speaker 5 and the microphone 6 are provided, so that the intercom can be hung and worn.

[0118] Furthermore, as shown in FIG12 and FIG13 , a back clip 61 is further provided on the housing 1, and a magnetic attraction module is further provided on the wearing surface 102 along the thickness direction;

[0119] The magnetic module includes a magnetic block (not shown in the figure) provided on the housing 1 and a magnetic seat 71 used in conjunction with the magnetic block.

[0120] Through the cooperation of the magnetic block and the magnetic seat 71, the clothes can be clamped and are easy to wear;

[0121] The back clip 61 and the magnetic module are used to realize different wearing methods.

[0122] Specifically, the wearing effects are shown in Figures 14 to 17. The diverse wearing methods are more convenient to operate and carry, allowing users to choose the most suitable method according to specific scenarios and needs, meeting users' diverse usage needs.

[0123] Furthermore, the sound outlet 302 of the loudspeaker 5 and the sound receiving hole 302 of the microphone 6 are oriented in different directions, and the propagation path of the sound of the loudspeaker 5 and the propagation path of the sound of the microphone 6 are different;

[0124] That is, the sound propagation path of the loudspeaker 5 is different from the sound reception path of the microphone 6, and there is no intersection or the intersection is very limited, thereby reducing the interference effect between them;

[0125] The microphone 6 and the speaker 5 are oriented in different directions, which can effectively avoid the occurrence of echo and improve the clarity of the sound;

[0126] On the other hand, such a design ensures that the sound propagation path of the speaker 5 does not pass directly through the microphone 6, thereby reducing the interference of non-direct sound waves on the microphone 6 and improving the directional performance of the microphone 6; this can enable the microphone 6 to receive sounds in a specific direction more concentratedly, thereby improving the quality and clarity of the voice signal.

[0127] In summary, the different orientations of the intercom microphone 6 and speaker 5 can reduce echo, improve the directivity and clarity of sound, and reduce noise and environmental interference. These factors work together to improve the sound quality of the intercom and optimize the user experience.

[0128] Furthermore, a cavity 41 is provided on the housing 1 , and the speaker 5 and the microphone 6 are provided in different cavities 41 ;

[0129] Such a design actually separates the positions of the speaker 5 and the microphone 6, which is also commonly referred to as acoustic isolation or acoustic separation.

[0130] The cavity 41 protects the speaker 5 and the microphone 6 from the external environment, isolating most of the external noise. The sound is received through the sound receiving hole 302 and released through the sound outlet 301, thereby enhancing the directionality of the sound reception and release.

[0131] Specifically, inside the intercom, when the distance between the speaker 5 and the microphone 6 is too close, the sound may produce an echo and affect the sound reception effect of the microphone 6. At the same time, the sound output by the speaker 5 may also directly enter the microphone 6, causing noise or interference; by separating the positions of the speaker 5 and the microphone 6, the possibility of echo and interference can be effectively reduced, thereby improving the clarity and purity of the sound effect.

[0132] In addition, when the speaker 5 and the microphone 6 are too close to each other, the surrounding environmental noise will be amplified and diffused, affecting the quality of the sound effect.

[0133] In summary, in a walkie-talkie, locating the speaker 5 and the microphone 6 in different cavities 41 is an important design factor for optimizing the sound effect, which can improve the clarity and purity of the sound effect.

[0134] Furthermore, as shown in FIG7 , the size of the cavity 41 in which the loudspeaker 5 is provided gradually decreases from the inside to the outside along the sound propagation direction;

[0135] The cavity 41 in which the microphone 6 is disposed has a size that gradually decreases from the outside to the inside along the sound propagation direction.

[0136] This design in which the size of the cavity 41 of the loudspeaker 5 and the microphone 6 gradually decreases along the sound propagation direction is called an acoustic waveguide.

[0137] The design of gradually reducing the size of the cavity 41 of the speaker 5 and the microphone 6 along the direction of sound propagation is consistent with the distance of the acoustic waveguide, which can enhance the diffusion and directivity of the sound waves, improve the focus and directionality of the sound, and optimize the sound experience of the user.

[0138] The gradually shrinking cavity 41 also reduces sound scattering. Scattering refers to the phenomenon where sound waves are reflected and diffused when they encounter obstacles or boundaries. By gradually shrinking cavity 41, the collision of sound waves with the boundaries of cavity 41 is reduced, thereby reducing sound diffusion and reflection, allowing sound to be transmitted more accurately to the target area.

[0139] During sound propagation, the energy of sound usually decays as the distance increases; the gradually shrinking cavity 41 design can control the degree of sound attenuation, so that the sound maintains higher energy and sound quality during the propagation process.

[0140] In general, gradually reducing the size of the cavity 41 of the speaker 5 and microphone 6 along the sound propagation direction can provide better sound focus, directionality, and accuracy. This design is commonly used in applications such as audio systems and speaker and microphone 6 arrays to improve sound propagation.

[0141] Furthermore, the number of the sound holes 301 includes one or more, and the sound holes 301 are staggered in an upper and lower arrangement;

[0142] The staggered arrangement of sound holes 301 can reduce audio issues caused by resonance or distortion. Sound waves may interfere with or reflect from other components during propagation, and the staggered arrangement of sound holes 301 can reduce this problem, thereby improving audio quality and clarity.

[0143] The embodiments of the present invention have at least the following beneficial effects:

[0144] The embodiment of the present invention provides a small-sized walkie-talkie, which optimizes the setting position and orientation angle of the speaker 5, and helps to improve the communication sound quality; the sound outlet 301 is distributed in the vibration direction of the speaker 5, and the sound receiving hole 302 is distributed in the vibration direction of the microphone 6, which further enhances the directionality of sound propagation and optimizes the position distribution relationship of the sound outlet 301. There is a difference in the orientation of the sound outlet 301 and the sound receiving hole 302. The speaker 5 and the microphone 6 are set in different cavities 41 on the same side. The size of the cavity 41 with the speaker 5 gradually becomes smaller along the sound propagation direction; the size of the cavity 41 with the microphone 6 gradually becomes larger along the sound propagation direction; under the joint action of the above designs, the clarity and purity of the sound effect are improved; a lanyard hole 51, a back clip 61, and a magnetic suction module are provided; a variety of wearing methods are provided, which is more convenient to operate and carry.

[0145] The rest of the contents that are the same as those in Example 1 are not repeated here.

[0146] Example 3

[0147] This embodiment also provides a small-sized intercom. The design of the sound cavity makes the output volume of the intercom higher and louder. The structure of the intercom is shown in Figures 18-23 of the specification. The specific scheme is as follows:

[0148] A small-sized walkie-talkie includes a flat shell 1 and a circuit board 3 and a speaker 5 arranged in the shell 1. The shell 1 includes a wearing surface 102 for being worn on the human body, a pressing surface 101 opposite to the wearing surface 102, and a connecting surface 103 connecting the wearing surface 102 and the pressing surface 101.

[0149] Preferably, the connection surface 103 is provided with a sound hole 301, and the speaker 5 is located on the circuit board 3 and emits sound toward the sound hole 301. Since the intercom is usually worn on the chest, arm, or helmet, the sound emitted by the sound hole 301 located on the connection surface 103 can be better heard by the user in these wearing methods, thereby improving the user experience. In other embodiments, the sound hole 301 is located on the pressing surface 101, in which case the intercom is best worn on the shoulder.

[0150] The sound outlet 301 is the sound emitting hole. For example, the overall shape of the housing 1 is flat. This flatness enhances the stability of the housing 1 and prevents the walkie-talkie from rolling when worn with the lanyard. In a first embodiment, as shown in Figures 18 and 19, the housing 1 is shaped like a pancake, and the connecting surface 103 is a curved surface with a certain curvature, giving the walkie-talkie a rounded appearance and enhancing the grip. In a second embodiment, as shown in Figures 20 and 21, the housing 1 is shaped like a square box. In other embodiments, the housing 1 can also be shaped like a hexagonal box or an octagonal box. Preferably, the distance between the wearing surface 102 and the pressing surface 101 is greater than 6 mm and less than 35 mm. Because the housing 1 contains components such as the circuit board 3 and the battery 4, and to maintain a certain level of structural strength, the distance between the wearing surface 102 and the pressing surface 101 is greater than 6 mm. A distance of less than 35 mm facilitates wearing and holding the walkie-talkie and makes it easier to fit in a pocket. Specifically, the distance between the wearing surface 102 and the pressing surface 101 is the thickness of the flat housing 1. When the housing 1 is at its thinnest, while ensuring structural strength, the thickness of the wearing surface 102 and the pressing surface 101 are 0.6 mm. To reduce the thickness of the housing 1, the battery 4 is a low-profile battery, and the circuit board 3 can be placed side by side with the battery 4 within the housing 1.

[0151] Specifically, as shown in FIG18 , the internal space of the housing 1 directly above the circuit board 3 is a first space 9a close to the pressing surface 101, and directly below the circuit board 3 is a second space 10a close to the wearing surface 102. A rear sound cavity 12a located at the rear of the speaker 5 for enhancing the sound effect of the speaker 5 is provided in the first space 9a and / or the second space 10a. The volume of the rear sound cavity 12a is greater than 0.5cc and less than 8cc. "cc" is the abbreviation of "cubic centimeter" and can also be expressed as "cm 3The volume of the rear acoustic cavity 12a can be adjusted between 0.5cc and 8cc according to different needs. Since the first space 9a and the second space 10a are affected by the size of the housing 1 and electronic devices and circuits are installed therein, the rear acoustic cavity 12a located in the first space 9a and the second space 10a is limited to less than 8cc. Secondly, when the volume of the rear acoustic cavity is larger than 8cc, its volume change will have a relatively small impact on the low-frequency performance. When the volume of the rear acoustic cavity 12a is less than 0.5cc, low-frequency signals have difficulty passing through the rear acoustic cavity 12a, resulting in poor bass effect and low volume output by the intercom.

[0152] Furthermore, the rear sound cavity 12a is preferably a sealed cavity, which can effectively isolate interference from external sounds and noise, providing more accurate and clear sound effects. In other embodiments, the rear sound cavity 12a is an unsealed cavity. Unsealed cavities can increase the extension and depth of low-frequency response, but are also susceptible to external noise and interference.

[0153] Preferably, the speaker 5 is located at an edge of the circuit board 3 and is perpendicular to the circuit board 3. The first space 9a and the second space 10a are located at the rear of the speaker 5. The rear sound cavity 12a is provided in both the first space 9a and the second space 10a. In other embodiments, for example, the sound outlet 301 is located in the pressing surface 101. In this case, the speaker 5 is located in the first space 9a, and the rear of the speaker 5 is located in the first space 9a. Therefore, the rear sound cavity 12a is provided only in the first space 9a.

[0154] Furthermore, an inner bracket 2 and an antenna 7 are provided in the housing 1. The antenna 7 is used to receive and transmit radio signals. The antenna 7 is electrically connected to the circuit board 3. The inner bracket 2 is used to set up the antenna 7 in the first space 9a. The components, circuits, etc. on the circuit board 3 may block or interfere with the wireless signal. For example, if the layout distance between the high-frequency circuit and the antenna is too close, it may cause interference between them. In addition, the signal lines on the circuit board 3 may generate crosstalk, causing problems such as mutual interference and cross coupling of signals. Therefore, setting up the antenna 7 on the circuit board 3 can improve the communication range and communication quality of the walkie-talkie.

[0155] Preferably, the inner bracket 2 connects the edge of the circuit board 3 and the inner wall of the housing 1, which can enhance the sealing of the intercom. The speaker 5 is located within the inner bracket 2, and a front sound cavity 14a is formed between the front of the speaker 5 and the inner bracket 2. When the speaker 5 pushes air forward, the air in the front cavity rebounds, forming a resonance effect, which increases the sound pressure of the sound wave, reduces high-frequency noise, and outputs the sound to a greater distance.

[0156] Furthermore, a battery 4 for power supply is also provided in the shell 1, and the battery 4 is located in the second space 10a. The shape of the battery 4 is preferably flat, and is stacked up and down with the circuit board 3 to reduce the thickness of the walkie-talkie. A microphone 6 is also provided in the shell 1, and a sound receiving cavity 16 is formed between the inner bracket 2 and the inner wall of the shell 1. The microphone 6 is located in the sound receiving cavity 16, and a sound receiving hole 302 is provided in the shell 1 corresponding to the sound receiving cavity 16. Walkie-talkies are often used outdoors or in windy environments, and wind noise can cause great interference to voice communications. The sound receiving cavity 16 can play a certain windproof effect. When strong wind enters the sound receiving hole 302 and the sound receiving cavity 16 at an angle, the sound receiving cavity 16 can attenuate the flow rate and pressure of the airflow, reduce the impact of wind noise on the microphone 6, and improve the clarity of voice communication.

[0157] Preferably, the sound receiving hole 302 is located on the connecting surface 103. Similar to the sound outlet hole 301, the sound receiving hole 302 located on the connecting surface 103 can better collect the sound of the user speaking, so that the user's sound waves are directly facing the sound receiving hole 302. In other embodiments, the sound receiving hole 302 is located on the pressing surface 101. In this case, it is suitable for wearing the walkie-talkie close to the throat, so that when the user lowers his head, he is facing the sound receiving hole 302. Preferably, the housing 1 is also provided with a first button 8 and a second button 9 electrically connected to the circuit board 3, with the first button 8 facing the pressing surface 101 and the second button 9 facing the connecting surface 103.

[0158] Furthermore, the sound outlet 301 and the sound receiving hole 302 face different directions, and the sound propagation path of the speaker 5 is different from the sound receiving path of the microphone 6. Preferably, when worn, the sound receiving hole 302 faces the human mouth, and the sound outlet 301 faces the human ear. In a first embodiment, the shape of the housing 1 is similar to a pancake, and the sound outlet 301 and the sound receiving hole 302 are located on the arc-shaped connecting surface 4. In a second embodiment, the shape of the housing 1 is similar to a square box, and the connecting surface 103 is a plurality of side planes. Preferably, the sound outlet 301 and the sound receiving hole 302 are located on the same side plane.

[0159] Exemplarily, a depressible pressing portion 15 is provided on the pressing surface 101 to trigger the first button 8 when pressed by an external force. In a first embodiment, as shown in FIG1 , the depressible pressing area 14 covers the entire pressing surface 101, facilitating control of the first button 8. In a second embodiment, as shown in FIG21 , a depressible pressing portion 15 is provided on a portion of the pressing surface 101, wherein the pressing area 14 and the pressing portion 15 are adjacent to each other.

[0160] Beneficial Effects: The present invention provides a compact intercom that, in addition to having a convenient button-activated function, includes a rear sound cavity 12a within the first space 9a and / or the second space 10a within the housing 1. This provides clearer, more natural, and more balanced sound, and increases the amplitude and intensity of the sound, resulting in a higher volume and louder sound output from the intercom. Furthermore, the volume of the rear sound cavity 12a is greater than 0.5cc and less than 8cc, which enhances low-frequency sound waves, making the low-frequency sound more mellow and improving the user experience.

[0161] The rest of the contents that are the same as those in Example 1 are not repeated here.

[0162] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of a preferred implementation scenario, and the modules or processes in the accompanying drawings are not necessarily required to implement the present invention.

[0163] Those skilled in the art will appreciate that the modules in the devices in the implementation scenario can be distributed in the devices of the implementation scenario according to the implementation scenario description, or can be modified accordingly and located in one or more devices different from the implementation scenario. The modules in the above implementation scenario can be combined into one module or further split into multiple submodules.

[0164] The above serial numbers of the present invention are for description only and do not represent the advantages or disadvantages of the implementation scenarios.

[0165] The above disclosures are only several specific implementation scenarios of the present invention. However, the present invention is not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the scope of protection of the present invention.

Claims

1. A small-sized intercom, characterized in that: It includes a housing, a circuit board, an intercom module, a battery and an antenna, wherein the circuit board electrically connects the intercom module, the battery and the antenna; The circuit board is located inside the shell, the antenna is close to the inner wall of the shell, and there is a gap between the antenna and the circuit board; The battery is flat and arranged in a stacked manner with the circuit board; The overall size of the housing is constrained within a space of 70 mm*70 mm*40 mm.

2. A small-sized intercom according to claim 1, characterized in that: The antenna is arranged on one side of the circuit board and extends in substantially the same direction as the circuit board, and the distance between the antenna and the circuit board is within a range of 2 mm to 18 mm.

3. A small-sized intercom according to claim 1, characterized in that: The antenna is located around the circuit board, and the distance between the antenna and the circuit board or the battery is within 2 mm-15 mm.

4. A small-sized intercom according to claim 1, characterized in that: It also includes a speaker, a microphone and a first button, the circuit board is also electrically connected to the speaker, the microphone and the first button, and the first button protrudes toward the antenna relative to the circuit board; The area on the shell directly above the first button is a pressing area, and a pressing portion connected to the first button extends from the inner wall of the pressing area toward the circuit board. The pressing portion is used to press the first button when the pressing area is pressed by external force.

5. A small-sized intercom according to claim 4, characterized in that: The shell comprises a side shell and an upper shell and a lower shell respectively connected to the side shell, wherein the side shell is located between the upper shell and the lower shell; the lower shell is used to be close to the user when the user wears it; The antenna is close to the upper housing or is arranged on the upper housing; The microphone and the speaker are close to the side housing or the upper housing.

6. A small-sized intercom according to claim 5, characterized in that: The circuit board is also electrically connected with an interface, and the interface is located on the side housing or the lower housing.

7. A small-sized intercom according to claim 5, characterized in that: It also includes a second button electrically connected to the circuit board, and the second button is distributed on the side shell.

8. A small-sized intercom according to claim 4, characterized in that: The speaker is arranged perpendicular to the circuit board, and the rear sound cavity of the speaker is close to the circuit board, and the front sound cavity is close to the inner wall of the shell.

9. A small-sized intercom according to claim 1, characterized in that: It also includes an inner bracket located in the shell, the inner bracket is connected to the circuit board and is used to mount the circuit board inside the shell.

10. The small-sized intercom according to claim 5, characterized in that: The upper shell and / or the lower shell may have a rectangular or circular shape, and all or part of the side shell may be arc-shaped.

11. A small-sized intercom according to claim 1, characterized in that: Also includes: The housing has a thickness direction, a height direction and a width direction which are orthogonal to each other, and the thickness direction is defined as a direction which is close to or away from a side of a human body when worn; The height direction is defined as the extension direction of the head and feet of the human body; the width direction is perpendicular to the height direction; the shell has a wearing surface close to the human body along the thickness direction and a pressing surface away from the human body along the thickness direction; When worn, the vibration directions of the speaker and the microphone are between the height direction and the width direction, and the speaker and the microphone are both facing the head of the human body.

12. A small-sized intercom according to claim 11, characterized in that: The housing also has a connecting surface connecting the wearing surface and the pressing surface; The connecting surface is provided with sound outlet holes and sound receiving holes. The sound outlet holes are distributed in the vibration direction of the speaker, and the sound receiving holes are distributed in the vibration direction of the microphone.

13. A small-sized intercom according to claim 12, characterized in that: In the wearing state, when observed along the thickness direction, the angle between the extension direction of the sound outlet of the speaker and the height direction is between 0 degrees and 63.5 degrees; Observing along the width direction, an angle between the extension direction of the sound outlet of the speaker and the height direction is between 0 degrees and 80.5 degrees.

14. The small-sized intercom according to claim 11, characterized in that: The speaker and the microphone are arranged in the housing, and the speaker and the microphone are located on the same side; A lanyard hole for connecting a lanyard is also provided on one side of the housing where the speaker and the microphone are distributed; The housing is provided with a back clip and / or a magnetic suction module; The magnetic suction module comprises a magnetic suction block arranged on the shell and a magnetic suction seat arranged corresponding to the magnetic suction block; The back clip and the magnetic module are used to realize different wearing methods of the walkie-talkie.

15. The small-sized intercom according to claim 12, characterized in that: The sound outlet of the speaker and the sound receiving hole of the microphone are oriented in different directions, and the sound propagation path of the speaker and the sound receiving path of the microphone are different; the number of the sound outlet holes includes one or more, and the sound outlet holes are staggered up and down; a plurality of cavities are further provided in the shell, and the speaker and the microphone are provided in different cavities; The size of the cavity in which the speaker is arranged gradually decreases along the sound propagation direction; the size of the cavity in which the microphone is arranged gradually increases along the sound propagation direction.

16. A small-sized intercom according to claim 1, characterized in that: It comprises a flat shell and a speaker arranged in the shell; The shell comprises a wearing surface for being worn on a human body, a pressing surface opposite to the wearing surface, and a connecting surface connecting the wearing surface and the pressing surface, the pressing surface or the connecting surface is provided with a sound outlet, the speaker is connected to the circuit board and the sound emission direction is toward the sound outlet; A first space is formed directly above the circuit board and the pressing surface, and a second space is formed directly below the circuit board and the wearing surface. The rear sound cavity located at the rear of the speaker is arranged in the first space and / or the second space, and the volume of the rear sound cavity is greater than 0.5cc and less than 8cc.

17. A small-sized intercom according to claim 16, characterized in that: The distance from the wearing surface to the pressing surface is greater than 6 mm and less than 35 mm.

18. A small-sized intercom according to claim 16, characterized in that: The housing is further provided with an inner bracket and an antenna, the antenna is electrically connected to the circuit board, and the inner bracket is used to set up the antenna in the first space; The inner bracket connects the edge of the circuit board and the inner wall of the shell, and the speaker is located on the inner bracket. A front sound cavity is formed between the front of the speaker and the inner bracket; a battery for power supply is also provided in the shell, and the battery is located in the second space.

19. A small-sized intercom according to claim 18, characterized in that: A microphone is also provided in the shell, a sound receiving cavity is formed between the inner bracket and the inner wall of the shell, the microphone is located in the sound receiving cavity, and a sound receiving hole is provided in the shell corresponding to the sound receiving cavity; the sound receiving hole is located on the pressing surface or the connecting surface.

20. A small-sized intercom according to claim 19, characterized in that: The sound receiving hole is used to make the sound receiving direction of the microphone toward the user's mouth area, and the sound outlet hole is used to make the sound emitting direction of the speaker toward the user's ear; The housing is also provided with a first button and a second button electrically connected to the circuit board, wherein the first button faces the pressing surface, and the second button faces the connecting surface.

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