CN108705975B

CN108705975B - Rear-view mirror

Info

Publication number: CN108705975B
Application number: CN201810517370.0A
Authority: CN
Inventors: 潘磊
Original assignee: Shenzhen Germid Electronic Technology Co Ltd
Current assignee: Shenzhen Germid Electronic Technology Co Ltd
Priority date: 2018-05-25
Filing date: 2018-05-25
Publication date: 2020-03-17
Anticipated expiration: 2038-05-25
Also published as: CN108705975A; WO2019223050A1

Abstract

The invention provides a rearview mirror, and belongs to the field of vehicle equipment. The rearview mirror comprises a rearview mirror body and a rearview mirror bracket; an ETC module and an anti-disassembly detection circuit are arranged in the rearview mirror body; the rearview mirror bracket comprises a hollow connecting rod and a base communicated with the hollow connecting rod; the rearview mirror body is connected with the base through the hollow connecting rod; the base is provided with a touch switch circuit and a protection piece, the protection piece covers the rest part of the touch switch circuit except for a switch contact, the base is fixed on a windshield through a bottom piece, and the switch contact is abutted against the side end, adjacent to the windshield, of the bottom piece; the touch switch circuit is electrically connected with the anti-dismantling detection circuit through a lead penetrating through the hollow connecting rod, and the anti-dismantling detection circuit is used for detecting the state of the switch contact. The rearview mirror is provided with a tight anti-cracking anti-dismantling system, and the anti-dismantling performance is effectively improved.

Description

Rear-view mirror

Technical Field

The invention relates to the technical field of vehicle equipment, in particular to a rearview mirror.

Background

For convenience of passage, more and more vehicle owners install ETC modules, which are generally attached to a windshield on one side of a steering wheel of a passenger car. There are also direct latching of the module to the rear view mirror. In order to prevent the ETC module from being detached for other vehicles, such as large and small vehicles, for fee evasion, and the like, part of the ETC module is provided with a detachment prevention function.

The technology is prevented tearing open by current rear-view mirror ETC module, has proposed can realize preventing the purpose of tearing open with a touch switch. However, the existing technology does not reasonably design the position of the touch switch, so that the ETC module is still easy to dismantle and crack, and can be used for other vehicles after being cracked, and the due anti-dismantling effect is not realized.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides a rearview mirror.

In order to achieve the above object, the technical solutions provided by the embodiments of the present invention are as follows:

the embodiment of the invention provides a rearview mirror, which comprises a rearview mirror body and a rearview mirror bracket, wherein the rearview mirror body is provided with a front mirror base and a rear mirror base; an ETC module and an anti-disassembly detection circuit are arranged in the rearview mirror body; the rearview mirror bracket comprises a hollow connecting rod and a base communicated with the hollow connecting rod; the rearview mirror body is connected with the base through the hollow connecting rod; the base is provided with a touch switch circuit and a protection piece, the protection piece covers the rest part of the touch switch circuit except for a switch contact, the base is fixed on a windshield through a bottom piece, and the switch contact is abutted against the side end, adjacent to the windshield, of the bottom piece; the touch switch circuit with prevent tearing open detection circuitry and locate through wearing to establish the inside wire electricity of cavity connecting rod is connected, prevent tearing open detection circuitry and be used for detecting the state of switch contact, and according to state control the operating condition of ETC module.

The mirror support is mounted to the base plate and the switch contacts are pressed in. The touch switch circuit and the lead connecting the touch switch circuit and the anti-disassembly detection circuit are tightly clamped among the windshield, the bottom plate and the rearview mirror bracket, and foreign matters cannot contact the rearview mirror bracket. Therefore, a tight protection system is formed for the touch switch circuit and the lead, and the absolute tightness of the anti-disassembly system is ensured.

Furthermore, a resistor is connected in series on a loop of the touch switch circuit, and the anti-disassembly detection circuit is used for determining the state of the switch contact by detecting the voltage of the resistor.

The voltage of resistance can be confirmed the state of switch contact, so touch switch circuit can turn into the state of switch contact and transmit for the signal of telecommunication prevents tearing open detection circuitry, thereby control the operating condition of ETC module, the effectual purpose of preventing tearing open.

In the embodiment of the invention, the base is further provided with a hardware matching loop connected with the touch switch circuit in parallel, the anti-dismantling detection circuit is electrically connected with the hardware matching loop through the conducting wire, and the anti-dismantling detection circuit is further used for controlling the working state of the ETC module by detecting the signal of the hardware matching loop.

Furthermore, the hardware matching loop comprises at least one device, the state of the device is changed when the signal of the device senses the dismantling action, and the dismantling prevention detection circuit is used for controlling the working state of the ETC module according to the state of the signal.

The hardware matching circuit is equivalent to a disassembly-preventing circuit which can realize the disassembly-preventing function same as that of the touch switch circuit, and can also control the working state of the ETC module, so that the disassembly-preventing capability is improved through the hardware matching circuit.

In the embodiment of the present invention, a surface of the protector which contacts the base plate is inclined.

The surface of the protection piece contacting with the bottom plate is inclined to prevent a person from extending into the bottom plate from the upper part of the base to press the switch.

In the embodiment of the invention, the rearview mirror body comprises a front shell, a rear shell and a processing chip, wherein a lens connected with the processing chip is installed on the rear shell, and the processing chip is used for receiving an image acquired by the lens and controlling the image to be displayed on a display device connected with the processing chip.

Furthermore, a display screen is embedded on the front shell, the display screen is connected with the processing chip, and the processing chip controls the image to be displayed on the display screen.

The lens can record the running state of the vehicle, so that the rearview mirror has the function of an automobile data recorder.

Further, the rear-view mirror body still includes light guide plate and chip frame, handle the chip set up in on the chip frame, the light guide plate is located the chip frame with between the display screen, still be provided with the LED lamp on the processing chip, the light that the LED lamp launches pierces through the light guide plate will preset mark on the light guide plate is shown on the display screen.

Through the chip frame with the cooperation of light guide plate can show preset mark on the display screen, save the cost.

Furthermore, a loudspeaker is arranged on the processing chip and used for outputting prompt information.

Through setting up loudspeaker, when carrying out relevant operation, loudspeaker can indicate relevant information.

Furthermore, a key is arranged on the front shell, the key is connected with the processing chip, and the processing chip is used for receiving key operation through the key and controlling the output volume of the loudspeaker according to the key operation.

Through setting up the button, the button can control the volume of loudspeaker makes the loudspeaker volume adjust according to specific environment.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below. It is appreciated that the following drawings depict only some embodiments of the invention and are therefore not to be considered limiting of its scope, for those skilled in the art will be able to derive additional related drawings therefrom without the benefit of the inventive faculty.

FIG. 1 is a cross-sectional view of a rearview mirror provided in accordance with an embodiment of the present invention;

FIG. 2 is an exploded view of a rearview mirror provided in accordance with an embodiment of the present invention;

FIG. 3 is a schematic view of a first angle of a partial first embodiment of a rearview mirror in accordance with an embodiment of the present invention;

FIG. 4 is a second perspective view of a portion of a first embodiment of a rearview mirror in accordance with the present invention;

FIG. 5 is a schematic view of a second embodiment of a portion of a rearview mirror provided in accordance with an embodiment of the present invention;

FIG. 6 is a schematic diagram of a partial circuit structure of a rearview mirror provided in an embodiment of the present invention;

FIG. 7 is a flowchart illustrating operation of a tamper detection circuit according to an embodiment of the present invention;

fig. 8 is a block diagram of a portion of a rearview mirror system provided in accordance with an embodiment of the present invention.

Icon: 10-rear view mirror; 11-a rearview mirror body; 110-a front shell; 1101-a keypad; 112-rear shell; 1120-first rubber column; 1122-second silica gel column; 113-an ETC module; 114-a display screen; 115-a chip holder; 116-a processing chip; 117-a light guide plate; 118-a horn; 12-a rearview mirror bracket; 120-hollow connecting rod; 122-a base; 1221-touch switch circuit; 1222-a PCB cover; 1223-touch switch; 1224 — first screw; 1226-stop; 1227-a second screw; 20-a negative film; 30-a windshield; 40-a wire; 50-a lens; 51-a lens holder; 300-touch switch loop; 400-hardware matching loop.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "middle", "upper", "lower", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally laid out when products of the present invention are used, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should be noted that the terms "disposed," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless otherwise explicitly stated or limited. Either mechanically or electrically. They may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

Referring to fig. 1 and 2, the rearview mirror 10 includes a rearview mirror body 11 and a rearview mirror bracket 12; the rearview mirror body 11 is internally provided with an ETC module 113 and an anti-disassembly detection circuit; the mirror support 12 comprises a hollow connecting rod 120 and a base 122 communicating with the hollow connecting rod 120; the rearview mirror body 11 is connected with the base 122 through the hollow connecting rod 120; the base 122 is provided with a touch switch circuit 1221 and a protector, the protector 1222 covers the rest part of the touch switch circuit 1221 except for a switch contact, the base 122 is fixed on a windshield 30 through a bottom plate 20, and the switch contact abuts against the side end of the bottom plate 20 adjacent to the windshield 30; the touch switch circuit 1221 with prevent tearing open the detection circuitry through wear to establish with the inside wire 40 electricity of cavity connecting rod 120 is connected, prevent tearing open the detection circuitry and be used for detecting the state of switch contact, and according to the control state of state control ETC module 113.

Alternatively, the surface of the protector which contacts the base sheet 20 is inclined.

Optionally, the lead 40 may be configured as a single lead unit, or may be integrated with a plurality of lead units, or may be configured with a lead protection sleeve, so as to increase the service life of the lead 40.

Alternatively, referring to fig. 3 and 4, the protection member may be a PCB cover 1222, a square hole 1225 is formed in the base 122 for accommodating the touch switch circuit 1221, the touch switch circuit 1221 is placed in the square hole 1225, and the PCB cover 1222 is fixed to the base 122 by a first screw 1224, so as to cover the touch switch circuit 1221 except for the touch switch 1223 contact; the side end of the base sheet 20 adjacent to the windshield 30 abuts the contact, and the side of the PCB cover 1222 contacting the side end is disposed obliquely. The base sheet 20 may be fixed on the windshield, and then the base 122 is attached to the base sheet 20, and the positions of the base 122 and the base sheet 20 are fixed by screws.

Optionally, referring to fig. 5, the protecting member may be a stopper 1226, a space for accommodating the touch switch circuit 1221 is formed in the base 122, and a baffle is disposed on a surface of the accommodating space contacting the bottom plate 20. The touch switch circuit 1221 is placed in the accommodating space, and a part of the touch switch 1223 except for the contact point is covered by the baffle, and the other part is covered by the stopper 1226; the side end of the bottom plate 20 adjacent to the windshield is abutted against the contact point, the stopper 1226 is in contact with the side end, the side of the stopper 1226 in contact with the side end is arranged obliquely, and the stopper 1226 can be fixed on the bottom plate 20 or the base 122 by screws. The base sheet 20 may be fixed on the windshield, and then the base 122 is attached to the base sheet 20, and the positions of the base 122 and the base sheet 20 are fixed by screws.

Alternatively, the base plate 20 may be a glass base plate or a rubber base plate, and the mirror support 12 may be a metal support or an alloy support.

The mirror support 12 is mounted to the base plate 20 and the touch switch circuit 1221 is pressed in. The touch switch circuit 1221 and the lead wire 40 are tightly sandwiched between the windshield 30, the base sheet 20 and the rearview mirror support 12, forming a tight protection system; and the surface of the protection member contacting the base sheet 20 is inclined, preventing a person from pressing the touch point of the touch switch 1223 by hand, and ensuring the tightness of the anti-detachment system.

Optionally, referring to fig. 6, a resistor R is connected in series to the touch switch circuit 300, and the tamper detection circuit is configured to determine the state of the switch contact by detecting a voltage of the resistor R.

Since the resistor R is connected in series with the touch switch 1223, the voltage of the resistor R may be changed due to the state of the switch contact. When the switch contact is in a conducting state, the normal voltage value of the resistor R is detected in the anti-disassembly detection circuit; when the state of the switch contact is an open state, the touch switch circuit 300 may be in an open or short circuit state, the voltage value of the resistor R may be reduced or changed to 0, and the tamper detection circuit detects an abnormal voltage value of the resistor R, so as to control the ETC module 113 to fail and stop working.

Optionally, the base 122 is further provided with a hardware matching loop 400 connected with the touch switch loop 300 in parallel, the tamper detection circuit is connected to the hardware matching loop 400 through the conducting wire 40, and the tamper detection circuit is used for controlling the working state of the ETC module 113 through the signal of the hardware matching loop 400.

Optionally, the hardware matching loop 400 includes at least one device C, a signal of the device C is affected and changed, and the tamper detection circuit is configured to control an operating state of the ETC module 113 according to a state of the signal.

Optionally, the device C may be a resistor, an encryption IC, or another device. When the device C senses an external removal action, a signal sent by the device C changes, and the sent signal may be a device parameter value or a digital code of the device C. When the tamper detection circuit cannot detect the parameter value or the digital code of the device C; or the parameter value of the device C is abnormal or the digital code is changed, the tamper-proof detection circuit controls the ETC module 113 to fail and not work any more.

Referring to fig. 7, a working flow of the tamper detection circuit is shown. Optionally, the working process includes: step 500: and (6) electrifying and self-checking. The content of the self-check can be signal parameters and digital codes generated by detecting the touch switch loop 300 and the hardware matching loop 400; when the ETC module 113 is activated by the activation authority card of the ETC module 113, the tamper-proof detection circuit may use the detected parameter value or digital code of the device C as the initial parameter value or initial digital code of the device C; step 501: touch switch 1223 detects. Detecting that the touch switch 1223 is closed, execute step 502; when the touch switch is detected to be turned off, step 503 is executed. Step 502: and (5) matching hardware. Matching with a device C of the hardware matching loop 400, if the matched value is the same as the initial parameter value or the initial digital code of the device C, executing step 504; if the matched value is different from the initial parameter value or initial digital code of the device C, step 503 is performed. Step 503: and controlling the ETC module 113 to be invalid and not working. Step 504: and controlling the ETC module 113 to work normally.

On one hand, the voltage of the resistor R can determine the state of the switch contact, so the touch switch circuit 300 can convert the state of the switch contact into an electric signal to be transmitted to the tamper detection circuit, thereby controlling the working state of the ETC module 113 and effectively achieving the purpose of tamper prevention. On the other hand, the hardware matching circuit 400 is equivalent to a reinforced anti-disassembly circuit capable of realizing the same anti-disassembly function as the touch switch circuit 300, and can also control the working state of the ETC module 113, and the anti-disassembly capability is increased by the cooperation of the hardware matching circuit 400 and the touch switch circuit 300.

Optionally, referring to fig. 2 again, the rearview mirror body 11 includes a front shell 110, a rear shell 112 and a processing chip 116, the lens 50 connected to the processing chip 112 is installed on the rear shell 112, and the processing chip 116 is configured to receive an image acquired by the lens 50 and control the image to be displayed on a display device connected to the processing chip 116.

Alternatively, the ETC module 113 may be placed in the rear housing 112, the front housing 110 and the rear housing 112 may be fixed to form the mirror body 11 integrally by a first rubber column 1120 disposed at a first end of the inside and a second silica gel column 1122 disposed at a second end of the inside, and the front housing 110 and the rear housing 112 may be respectively provided with screws to further fasten the positions of the front housing 110 and the rear housing 112.

Optionally, the display device may be a vehicle-mounted display in the vehicle cabin, or may be a display screen of the rearview mirror 10. The lens 50 may be mounted on the rear case 112 through a lens holder 51.

Optionally, a display screen 114 is embedded in the front shell 110, the display screen 114 is connected to the processing chip 116, and the processing chip 116 controls the image to be displayed on the display screen 114.

Optionally, the display screen 114 may be an anti-glare glass, which can prevent the eyes of the driver from being affected while driving; the display 114 may also be a touchable display.

The lens 50 can record the driving state of the vehicle by acquiring an image, so that the rearview mirror 10 has the function of a driving recorder.

Optionally, the rearview mirror body 11 further includes a light guide plate 117 and a chip frame 115, the processing chip 116 is disposed on the chip frame 115, the light guide plate 117 is located between the chip frame 115 and the display screen 114, an LED lamp is further disposed on the processing chip 116, light emitted by the LED lamp penetrates through the light guide plate 117, and a preset mark on the light guide plate 117 is displayed on the display screen 114.

Optionally, the preset mark may be specifically designed according to a function prompt mark to be displayed on the display screen 114.

Through the cooperation of the chip frame 115 and the light guide plate 117, characters can be displayed in a simple manner, and corresponding icons do not need to be designed on the display screen 114 in other manners independently, so that the cost is saved, meanwhile, the display screen 114 can have the function of a touch screen, and the corresponding function can be realized by touching the corresponding icons.

Optionally, a speaker 118 is disposed on the processing chip 116, and the speaker 118 is configured to output a prompt message.

Optionally, the speaker 118 may prompt whether the stored-value card is inserted; or when the vehicle passes through the toll station, generating a deduction time, and prompting deduction cost information and balance information.

Optionally, a key is disposed on the front shell 110, the key is connected to the processing chip 116, and the processing chip 116 is configured to receive a key operation through the key and control the output volume of the speaker 118 according to the key operation.

Optionally, the key may be a key plate 1101, a groove or a hole for accommodating the key plate 1101 is formed in the front case 110, the key plate 1101 is clamped in the groove or the hole and is connected to the processing chip 116, and the processing chip 116 senses an operation of the key plate 1101 to control an output volume of the speaker 118.

The volume of the loudspeaker 118 is controlled by setting keys, so that the volume of the loudspeaker 118 can be adjusted, and the volume can be changed as required.

Optionally, referring to fig. 8, the processing chip 116 controls the display screen 114, the speaker 118, the keys and the LEDs; the tamper detection circuit may also be disposed on the processing chip 116 or may be a separate circuit module connected to the processing chip 116. The processing chip 116 may be an integrated circuit board including a plurality of devices and circuits, or may be a microchip integrated with a microelectronic element. The processing chip 116 may also be connected to an on-board central control system.

In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

In addition, the functional modules in the embodiments of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.

The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A rearview mirror, characterized in that the rearview mirror comprises a rearview mirror body and a rearview mirror bracket; an ETC module and an anti-disassembly detection circuit are arranged in the rearview mirror body; the rearview mirror bracket comprises a hollow connecting rod and a base communicated with the hollow connecting rod; the rearview mirror body is connected with the base through the hollow connecting rod; the base is provided with a touch switch circuit and a protection piece, the protection piece covers the rest part of the touch switch circuit except for a switch contact, the base is fixed on a windshield through a bottom piece, and the switch contact is abutted against the side end, adjacent to the windshield, of the bottom piece; the surface of the protection piece, which is in contact with the bottom piece, is inclined; the touch switch circuit is electrically connected with the anti-dismantling detection circuit through a lead penetrating through the hollow connecting rod, and the anti-dismantling detection circuit is used for detecting the state of the switch contact and controlling the working state of the ETC module according to the state;

wherein the protection member is a PCB cover or a stopper; when the protection piece is a PCB cover, a square hole for accommodating the touch switch circuit is formed in the base, the touch switch circuit is placed in the square hole, and the PCB cover is fixed with the base through a first screw so as to cover the part of the touch switch circuit except for a touch switch contact; when the protection piece is a stop block, an accommodating space for accommodating the touch switch circuit is formed in the base, a baffle is arranged on one surface of the accommodating space, which is in contact with the negative, the touch switch circuit is placed in the accommodating space, one part of the touch switch circuit except for the contact is covered by the baffle, and the other part of the touch switch circuit is covered by the stop block.

2. The rearview mirror according to claim 1, wherein a resistor is connected in series to a circuit of the touch switch circuit, and the tamper detection circuit is configured to determine the state of the switch contact by detecting a voltage of the resistor.

3. The rearview mirror according to claim 1, wherein a hardware matching loop connected in parallel with the touch switch circuit is further disposed on the base, the tamper detection circuit is electrically connected to the hardware matching loop through the wire, and the tamper detection circuit is further configured to control an operating state of the ETC module by detecting a signal of the hardware matching loop.

4. The rearview mirror of claim 3, wherein said hardware matching circuit includes at least one device, a signal of said device is used for sensing a state change when in a dismantling action, and said tamper detection circuit is used for controlling an operating state of said ETC module according to a state of said signal.

5. The rearview mirror according to claim 1, wherein the rearview mirror body comprises a front shell, a rear shell and a processing chip, a lens connected with the processing chip is mounted on the rear shell, and the processing chip is used for receiving an image acquired by the lens and controlling the image to be displayed on a display device connected with the processing chip.

6. The rearview mirror according to claim 5, wherein a display screen is embedded in the front shell, the display screen is connected with the processing chip, and the processing chip controls the image to be displayed on the display screen.

7. The rearview mirror of claim 6, wherein the mirror body further comprises a light guide plate and a chip holder, the processing chip is disposed on the chip holder, the light guide plate is disposed between the chip holder and the display screen, and the processing chip is further disposed thereon with an LED lamp, the LED lamp emits light that penetrates through the light guide plate to display the predetermined mark on the light guide plate on the display screen.

8. The rearview mirror of claim 7, wherein a speaker is disposed on the processing chip, and the speaker is configured to output a prompt message.

9. The rearview mirror according to claim 8, wherein a key is arranged on the front shell, the key is connected with the processing chip, and the processing chip is used for receiving key operation through the key and controlling the output volume of the loudspeaker according to the key operation.