Multifunctional sound production device and electronic device

Abstract

The application provides a multifunctional sound production device and an electronic device. The multifunctional sound production device comprises a shell, a first vibration system, a second vibration system, a magnetic circuit system, a flexible circuit board and an elastic member; the magnetic circuit system is fixedly connected with the shell, the first vibration system is suspended in a receiving cavity of the shell through the magnetic circuit system; one end of the elastic member is connected with a side wall of the shell, the other end of the elastic member is connected with the second vibration system, and the second vibration system is suspended in the receiving cavity through the elastic member. The magnetic circuit system is used for driving the first vibration system to vibrate and produce sound in a first direction, and the magnetic circuit system is used for driving the second vibration system to vibrate in a second direction and / or in a third direction. In the second direction and / or the third direction, the magnetic circuit system is provided with an extension part extending to the outside of the multifunctional sound production device, and the magnetic circuit system is fixedly connected with the shell through the extension part, so as to increase the stability of the installation of the magnetic circuit system, and further increase the stability of the working of the multifunctional sound production device.

Description

Technical Field

[0001] This invention relates to the field of loudspeaker technology, and more particularly to a multifunctional sound-generating device and electronic device. Background Technology

[0002] Existing multifunctional sound-generating devices include a housing, a first vibration system, a second vibration system, a magnetic circuit system, and an elastic element. When the multifunctional sound-generating device is working, the magnetic circuit system drives the first vibration system to vibrate and generate sound, and also drives the second vibration system to vibrate. The elastic element facilitates the recovery of the second vibration system's motion. Typically, the magnetic circuit system is indirectly connected to the housing. This installation method results in poor installation strength of the magnetic circuit system. When the multifunctional sound-generating device is subjected to external forces such as impacts, the connection between the magnetic circuit system and the housing breaks, causing the multifunctional sound-generating device to malfunction.

[0003] Therefore, it is necessary to provide a multifunctional sound-generating device with higher connection stability. Summary of the Invention

[0004] This invention provides a multifunctional sound-generating device and electronic device. By directly connecting the magnetic circuit system to the housing, the stability of the magnetic circuit system connection is improved, thereby enhancing the working stability of the multifunctional sound-generating device.

[0005] The first aspect of this invention provides a multifunctional sound-generating device, comprising:

[0006] shell;

[0007] A first vibration system, capable of vibrating relative to the outer casing in a first direction to generate sound;

[0008] The second vibration system is connected to the outer casing and is capable of vibrating relative to the outer casing in a second direction and / or in a third direction. The second direction is perpendicular to the first direction, and the third direction is perpendicular to both the first and second directions.

[0009] A magnetic circuit system is used to drive the vibration of the first vibration system and the second vibration system.

[0010] Along the second direction and / or along the third direction, the magnetic circuit system is provided with an extension extending to the outside of the multifunctional sound-generating device. The magnetic circuit system is fixedly connected to the housing through the extension, and the first vibration system is suspended in the housing cavity through the magnetic circuit system.

[0011] Along the second direction and / or along the third direction, the multifunctional sound-generating device also includes an elastic element disposed opposite to it, one end of which is connected to the side wall of the housing, and the other end of which is connected to the second vibration system, which is suspended in the housing cavity by the elastic element.

[0012] In this application, the magnetic circuit system is directly and fixedly connected to the outer shell through the extension, which avoids the connection failure of the magnetic circuit system caused by external forces during the use and transportation of the multifunctional sound-generating device, thereby increasing the stability of the magnetic circuit system installation and thus increasing the stability of the multifunctional sound-generating device operation.

[0013] In one possible design, the housing is provided with a mounting hole, at least a portion of the extension is located within the mounting hole, and the extension abuts against the sidewall of the mounting hole.

[0014] In one possible design, the extension is welded to the sidewall of the mounting hole.

[0015] In one possible design, there are multiple extensions, arranged symmetrically along a second direction and / or a third direction.

[0016] In one possible design, the housing includes a first housing and a second housing, which form a receiving cavity, and the first housing and the second housing are detachably connected.

[0017] The extension is connected to the first housing, or the extension is connected to the second housing.

[0018] In one possible design, the magnetic circuit system includes a main magnet and a secondary magnet, with the secondary magnet arranged around the main magnet to form a magnetic gap;

[0019] The first vibration system includes a diaphragm and a voice coil, a portion of which abuts against the voice coil so that the voice coil drives the diaphragm to vibrate in a first direction to produce sound, and at least a portion of the voice coil is located in a magnetic gap;

[0020] The second vibration system includes a drive coil and a magnetic yoke. The drive coil is fixedly connected to the magnetic yoke so that the drive coil drives the magnetic yoke to vibrate along a second direction and / or a third direction. The drive coil includes a first side and a second side that are arranged opposite to each other. Along the first direction, the first side is arranged opposite to the main magnet, and the second side is arranged opposite to the auxiliary magnet.

[0021] In one possible design, the magnetic circuit system also includes a main pole core and a secondary pole core, with the main pole core fixedly connected to the main magnet and the secondary pole core fixedly connected to the secondary magnet, and the secondary pole core arranged around the main pole core.

[0022] The secondary electrode core includes a body portion, an extension portion disposed on the body portion, and the extension portion protrudes from the body portion along a second direction and / or along a third direction.

[0023] In one possible design, the multifunctional sound-generating device also includes multiple flexible circuit boards, some of which are connected to the first vibration system, some of which are connected to the secondary pole core, and some of which are connected to the second vibration system.

[0024] The extension is provided with a clearance hole, and at least a portion of the flexible circuit board connected to the secondary electrode core is located within the clearance hole.

[0025] In one possible design, the elastic element is connected to the second vibration system via a magnetic yoke.

[0026] A second aspect of the present invention provides an electronic device, comprising:

[0027] ontology;

[0028] A multi-functional sound-generating device, wherein the multi-functional sound-generating device is any one of the multi-functional sound-generating devices described above, and the multi-functional sound-generating device is installed on the main body.

[0029] In this application, users can control the sound and / or vibration of the multifunctional sound-generating device as needed to enhance the user experience. Attached Figure Description

[0030] Figure 1 A schematic diagram of the structure of the multifunctional sound-generating device provided by the present invention in one embodiment;

[0031] Figure 2 for Figure 1 Exploded view;

[0032] Figure 3 for Figure 1 A sectional view;

[0033] Figure 4 for Figure 3 Enlarged view of section I;

[0034] Figure 5 for Figure 2 Schematic diagram of the structure of the intermediate and auxiliary magnets;

[0035] Figure 6 for Figure 2 A schematic diagram of the structure of the first shell in the middle;

[0036] Figure 7 for Figure 3 Enlarged view of Part II;

[0037] Figure 8 for Figure 6 A schematic diagram of the structure of the first diaphragm in the middle;

[0038] Figure 9 for Figure 6 A schematic diagram of the structure of the second diaphragm in the middle;

[0039] Figure 10 for Figure 6 Schematic diagram of the diaphragm structure;

[0040] Figure 11 for Figure 6A schematic diagram of the central skeleton.

[0041] Figure label:

[0042] 1-Outer shell;

[0043] 11-Mounting holes;

[0044] 12-First shell;

[0045] 13-Second shell;

[0046] 14-Reception cavity;

[0047] 2-First vibration system;

[0048] 21-sound film;

[0049] 211-First diaphragm

[0050] 211a - First connecting part;

[0051] 211b - Second connecting part;

[0052] 212-Second diaphragm;

[0053] 212a - Third connecting part;

[0054] 212b - Fourth connecting part;

[0055] 22-Voice coil;

[0056] 23-Skeleton;

[0057] 231 - Mounting slot;

[0058] 232 - Through hole;

[0059] 24-Diaphragm;

[0060] 241 - Fifth connecting part;

[0061] 242-Sixth connecting part;

[0062] 25 - Place a planter stand on top;

[0063] 26 - Lower the planter stand;

[0064] 27 - Top of the ball;

[0065] 3-Second vibration system;

[0066] 31-Drive coil;

[0067] 311 - First side;

[0068] 312 - Second side;

[0069] 32-Magnetic yoke;

[0070] 4-Magnetic circuit system;

[0071] 41 - Main magnet;

[0072] 42-Secondary magnet;

[0073] 43-Main electrode core;

[0074] 44-Secondary electrode core;

[0075] 441-Ontology part;

[0076] 442 - Extension;

[0077] 442a - Clearance hole;

[0078] 45-Top magnet;

[0079] 5- Flexible circuit board;

[0080] 6-Elastic element.

[0081] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Detailed Implementation

[0082] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0083] This application provides an electronic device, which includes a main body and a multi-functional sound-emitting device installed on the main body. When the multi-functional sound-emitting device is working, the user can control the sound-emitting device to emit sound and / or vibrate as needed to improve the user experience.

[0084] like Figure 1 As shown, a first direction Z, a second direction X, and a third direction Y are defined. The first direction Z is the vibration direction of the first vibration system 2, and the second direction X and / or the third direction Y are the vibration directions of the second vibration system 3. The second direction X is perpendicular to the first direction Z, and the third direction Y is perpendicular to both the first and second directions.

[0085] Specifically, such as Figure 1 and Figure 2As shown, the multifunctional sound-generating device includes: a housing 1, a first vibration system 2, a second vibration system 3, a magnetic circuit system 4, a flexible circuit board 5, and an elastic element 6. The magnetic circuit system 4 is fixedly connected to the housing 1, and the first vibration system 2 is suspended in the receiving cavity 14 of the housing 1 through the magnetic circuit system 4. One end of the elastic element 6 is connected to the side wall of the housing 1, and the other end of the elastic element 6 is connected to the second vibration system 3, which is suspended in the receiving cavity 14 through the elastic element 6. The flexible circuit board 5 is used to connect the multifunctional sound-generating device to external electronic components to facilitate its use. The magnetic circuit system 4 drives the first vibration system 2 to vibrate and generate sound along a first direction Z, and also drives the second vibration system 3 to vibrate along a second direction X and / or a third direction Y, enabling the multifunctional sound-generating device to have both vibration feedback and voice feedback functions, thereby improving its performance.

[0086] like Figure 2 As shown, the magnetic circuit system 4 includes a main magnet 41 and a secondary magnet 42. The secondary magnet 42 is arranged around the main magnet 41 to form a magnetic gap. The magnetic circuit system 4 also includes a main pole core 43 attached to the main magnet 41, a secondary pole core 44 surrounding the main pole core 43 and attached to the secondary magnet 42, and an upper magnet 45 attached to the side of the main pole core 43 away from the main magnet 41. The secondary magnet 42 is installed in the receiving cavity 14 of the housing 1 through the secondary pole core 44, which simplifies the installation method of the secondary magnet 42, reduces the number of parts required for the installation of the secondary magnet 42, thereby reducing the space occupied by the receiving cavity 14 for the installation of the secondary magnet 42, and thus reducing the size of the multifunctional sound-generating device. This reduces the production cost of the multifunctional sound-generating device and the space required for its installation, making it easier to install and apply the multifunctional sound-generating device.

[0087] like Figure 2 As shown, the first vibration system 2 includes a diaphragm 21 and a voice coil 22. The diaphragm 21 includes a first diaphragm 211 and a second diaphragm 212, as shown. Figure 8 and Figure 9 As shown, the first diaphragm 211 is provided with a first connecting portion 211a and a second connecting portion 211b, and the second diaphragm 212 is provided with a third connecting portion 212a and a fourth connecting portion 212b; as Figure 2 As shown, along the first direction Z, the first vibration system 2 also includes an upper frame 25 and a lower frame 26 disposed opposite to each other, a diaphragm 24 disposed opposite to the diaphragm 21, and a frame 23 disposed between the diaphragm 21 and the diaphragm 24, as shown. Figure 10 As shown, the diaphragm 24 is disposed on the fifth connecting portion 241 and the sixth connecting portion 242. Figure 2 , Figure 3 and Figure 6As shown, the first connecting portion 211a of the first diaphragm 211 is clamped between the upper frame 25 and the lower frame 26, the second connecting portion 211b of the first diaphragm 211 is connected to one end of the frame 23, the other end of the frame 23 is connected to the sixth connecting portion 242 of the diaphragm 24, and the fifth connecting portion 241 of the diaphragm 24 is connected to the inner sidewall of the outer casing 1; wherein, the frame 23 is provided with a mounting groove 231 and a through hole 232, the third connecting portion 212a of the second diaphragm 212 is connected to the voice coil 22 through the sidewall of the mounting groove 231, and at least a portion of the upper magnet 45 passes through the through hole 232 and is connected to the fourth connecting portion 212b of the second diaphragm 212.

[0088] In this embodiment of the application, when the multifunctional sound-generating device is working, the voice coil 22 obtains alternating current from the outside. At this time, the voice coil 22 moves along the first direction Z under the action of the magnetic field generated by the main magnet 41 and the auxiliary magnet 42, and drives the diaphragm 21 to vibrate along the first direction Z through the frame 23, so that the first vibration system 2 vibrates and generates sound.

[0089] Among them, such as Figure 2 As shown, the first vibration system 2 also includes a dome 27, which is fixed on the frame 23 and located between the first connecting part 211a and the third connecting part 212a. The dome 27 can strengthen the frame 23, improve the frame 23's torsional resistance and anti-swaying ability, and improve the acoustic performance of the first vibration system 2.

[0090] like Figure 2 As shown, the second vibration system 3 includes a drive coil 31 and a magnetic yoke 32. The drive coil 31 is fixedly connected to the magnetic yoke 32 so that the drive coil 31 drives the magnetic yoke 32 to vibrate along the second direction X and / or along the third direction Y, as shown. Figure 3 As shown, the drive coil 31 includes a first side 311 and a second side 312 arranged opposite to each other. Along the first direction Z, the first side 311 is arranged opposite to the main magnet 41, and the second side 312 is arranged opposite to the auxiliary magnet 42. One end of the elastic member 6 is connected to the side wall of the outer shell 1, and the other end of the elastic member 6 is connected to the magnetic yoke 32. When the second vibration system 3 moves along the second direction X and / or along the third direction Y, the elastic member 6 can undergo elastic deformation.

[0091] In this embodiment, when the multifunctional sound-generating device is working, it moves along the second direction X and / or the third direction Y under the influence of the magnetic field generated by the main magnet 41 and auxiliary magnet 42 of the drive coil 31, causing the second vibration system 3 to vibrate. The magnetic circuit system 4 drives the magnetic yoke 32 to move through the drive coil 31, which simplifies the structure of the magnetic circuit system 4 driving the vibration of the second vibration system 3, thereby simplifying the structure of the multifunctional sound-generating device and reducing the production cost of the multifunctional sound-generating device.

[0092] When the second vibration system 3 vibrates, the elastic element 6 undergoes elastic deformation under the action of the magnetic yoke 32 and generates a restoring force. When the magnetic yoke 32 removes its restriction on the elastic element 6 or the current direction changes, the restoring force generated by the elastic element 6 can drive the second vibration system 3 to reset, facilitating the next movement of the second vibration system 3. Therefore, the inclusion of the elastic element 6 facilitates the repeated and continuous operation of the second vibration system 3, thereby improving the working stability and performance of the second vibration system 3, and ultimately enhancing the working stability of the multifunctional sound-generating device.

[0093] The number of elastic elements 6 is multiple, and the elastic elements 6 are symmetrically arranged along the second direction X and / or along the third direction Y.

[0094] In this embodiment, multiple elastic elements 6 are symmetrically arranged along the second direction X and / or along the third direction Y, that is, multiple elastic elements 6 are evenly distributed around the magnetic yoke 32, so that the force on the magnetic yoke 32 is evenly distributed, avoiding the second vibration system 3 from being unstable due to the force on one side of the magnetic yoke 32, thereby improving the stability of the second vibration system 3 and thus improving the working stability of the multifunctional sound-generating device.

[0095] like Figure 2 and Figure 3 As shown, in order to improve the stability of the magnetic circuit system 4 installation, the magnetic circuit system 4 is provided with an extension 442 extending outward to the multifunctional sound-generating device along the second direction X and / or along the third direction Y. The magnetic circuit system 4 is fixedly connected to the housing 1 through the extension 442.

[0096] In this embodiment, the magnetic circuit system 4 is directly and fixedly connected to the outer shell 1 through the extension 442, which avoids the failure of the connection of the sub-core 44 due to external forces during the use and transportation of the multifunctional sound-generating device, thereby increasing the stability of the sub-core 44 installation and thus increasing the stability of the multifunctional sound-generating device operation.

[0097] Among them, such as Figure 2 and Figure 5 As shown, the secondary electrode core 44 includes a body portion 441, an extension portion 442 disposed on the body portion 441, and the extension portion 442 protrudes from the body portion 441 along the second direction X and / or along the third direction Y.

[0098] In this embodiment, the extension 442 is disposed on the secondary electrode core 44, which facilitates the connection between the extension 442 and the outer shell 1, avoids the extension 442 being located on other structures, thus simplifying the structure of the extension 442.

[0099] Specifically, such as Figure 2 and Figure 11As shown, the housing 1 is provided with a mounting hole 11, at least a portion of the extension 442 is located inside the mounting hole 11, and the extension 442 abuts against the side wall of the mounting hole 11.

[0100] In this embodiment, the extension 442 abuts against the side wall of the mounting hole 11 to restrict the movement of the sub-core 44 relative to the outer shell 1, thereby facilitating the installation of the sub-core 44 and preventing the sub-core 44 from shifting and causing the connection between the sub-core 44 and the outer shell 1 to fail, thereby further improving the stability of the connection between the sub-core 44 and the outer shell 1.

[0101] More specifically, the extension 442 is welded to the sidewall of the mounting hole 11.

[0102] In this embodiment, the extension 442 is welded to the sidewall of the mounting hole 11, simplifying the connection between the secondary electrode core 44 and the outer shell 1. While ensuring a stable connection between the secondary electrode core 44 and the outer shell 1, this reduces the space required for the secondary electrode core 44 to be installed in the outer shell 1, thereby reducing the space occupied by the secondary electrode core 44 in the receiving cavity 14. Furthermore, the connection between the secondary electrode core 44 and the outer shell 1 can also be achieved through snap-fitting, bonding, etc. This application does not impose any special limitations on the specific connection method between the secondary electrode core 44 and the outer shell 1.

[0103] The number of extensions 442 is multiple, and the multiple extensions 442 are symmetrically arranged along the second direction X and / or along the third direction Y.

[0104] In this embodiment of the application, during the installation, use and transportation of the sub-core 44, the extension 442 will be subjected to the force of the outer shell 1. The multiple extensions 442 are symmetrically arranged so that the sub-core 44 is subjected to a uniform force, avoiding damage caused by uneven force on the sub-core 44, thereby extending the service life of the sub-core 44.

[0105] Specifically, such as Figure 2 As shown, the outer shell 1 includes a first shell 12 and a second shell 13, which form a receiving cavity 14. The first shell 12 and the second shell 13 are detachably connected. The extension 442 is connected to the first shell 12, or the extension 442 is connected to the second shell 13.

[0106] In this embodiment of the application, the outer shell 1 is divided into a first shell 12 and a second shell 13, which facilitates the installation, maintenance and replacement of various parts in the receiving cavity 14, thereby extending the service life of each part and thus extending the service life of the multifunctional sound-generating device.

[0107] like Figure 2 As shown, the extension 442 is provided with a clearance hole 442a, and at least a portion of the flexible circuit board 5 is located within the clearance hole 442a.

[0108] In this embodiment, the extension 442 is provided with a clearance hole 442a. During installation, at least a portion of the flexible circuit board 5 is located within the clearance hole 442a, which avoids interference between the flexible circuit board 5 and the extension 442, preventing the sub-core 44 from being installed. This improves the accuracy and stability of the sub-core 44 installation. At the same time, it avoids interference between the sub-core 44 and the flexible circuit board 5, preventing damage to the flexible circuit board 5 and thus extending the service life of the flexible circuit board 5.

[0109] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A multifunctional sound-generating device, characterized in that, The multifunctional sound-generating device includes: Outer shell (1); A first vibration system (2) is capable of vibrating and producing sound relative to the outer shell (1) in a first direction (Z); A second vibration system (3) is connected to the outer shell (1) and is capable of vibrating relative to the outer shell (1) along a second direction (X) and / or along a third direction (Y), wherein the second direction (X) is perpendicular to the first direction (Z) and the third direction (Y) is perpendicular to both the first direction (Z) and the second direction (X); A magnetic circuit system (4) is used to drive the first vibration system (2) and the second vibration system (3) to vibrate; Along the second direction (X) and / or along the third direction (Y), the magnetic circuit system (4) is provided with an extension (442) extending outward to the multifunctional sound-generating device. The magnetic circuit system (4) is fixedly connected to the housing (1) through the extension (442). The first vibration system (2) is suspended in the receiving cavity (14) of the housing (1) through the magnetic circuit system (4). The multifunctional sound-generating device also includes a plurality of flexible circuit boards (5), the extension (442) is provided with a clearance hole (442a), and at least a portion of the flexible circuit board (5) is located within the clearance hole (442a); Along the second direction (X) and / or along the third direction (Y), the multifunctional sound-generating device further includes an elastic element (6) disposed opposite to the second direction (X), one end of the elastic element (6) being connected to the side wall of the housing (1), and the other end of the elastic element (6) being connected to the second vibration system (3), the second vibration system (3) being suspended in the receiving cavity (14) by the elastic element (6).

2. The multifunctional sound-generating device according to claim 1, characterized in that, The outer casing (1) is provided with a mounting hole (11), at least a portion of the extension (442) is located in the mounting hole (11), and the extension (442) abuts against the side wall of the mounting hole (11).

3. The multifunctional sound-generating device according to claim 2, characterized in that, The extension (442) is welded to the sidewall of the mounting hole (11).

4. The multifunctional sound-generating device according to claim 1, characterized in that, The number of the extensions (442) is multiple, and the multiple extensions (442) are symmetrically arranged along the second direction (X) and / or along the third direction (Y).

5. The multifunctional sound-generating device according to claim 1, characterized in that, The outer shell (1) includes a first shell (12) and a second shell (13), the first shell (12) and the second shell (13) forming the receiving cavity (14), and the first shell (12) and the second shell (13) are detachably connected; The extension (442) is fixedly connected to the first housing (12), or the extension (442) is fixedly connected to the second housing (13).

6. The multifunctional sound-generating device according to any one of claims 1 to 5, characterized in that, The magnetic circuit system (4) includes a main magnet (41) and a secondary magnet (42), the secondary magnet (42) being arranged around the main magnet (41) to form a magnetic gap; The first vibration system (2) includes a diaphragm (21) and a voice coil (22), a portion of the diaphragm (21) abuts against the voice coil (22) so that the voice coil (22) drives the diaphragm (21) to vibrate and produce sound in the first direction (Z), and at least a portion of the voice coil (22) is located in the magnetic gap; The second vibration system (3) includes a drive coil (31) and a magnetic yoke (32). The drive coil (31) is fixedly connected to the magnetic yoke (32) so that the drive coil (31) drives the magnetic yoke (32) to vibrate along the second direction (X) and / or along the third direction (Y). The drive coil (31) includes a first side (311) and a second side (312) arranged opposite to each other along the first direction (Z). The first side (311) is arranged opposite to the main magnet (41), and the second side (312) is arranged opposite to the auxiliary magnet (42).

7. The multifunctional sound-generating device according to claim 6, characterized in that, The magnetic circuit system (4) further includes a main pole core (43) and a secondary pole core (44). The main pole core (43) is fixedly connected to the main magnet (41), and the secondary pole core (44) is fixedly connected to the secondary magnet (42). The secondary pole core (44) is arranged around the main pole core (43). The sub-core (44) includes a body portion (441), and an extension portion (442) is disposed on the body portion (441) and protrudes from the body portion (441) along the second direction (X) and / or along the third direction (Y).

8. The multifunctional sound-generating device according to claim 7, characterized in that, Part of the flexible circuit board (5) is connected to the first vibration system (2), part of the flexible circuit board (5) is connected to the sub-pole core (44), and part of the flexible circuit board (5) is connected to the second vibration system (3); At least a portion of the flexible circuit board (5) connected to the sub-core (44) is located within the clearance hole (442a).

9. The multifunctional sound-generating device according to claim 6, characterized in that, The elastic element (6) is connected to the second vibration system (3) via the magnetic yoke (32).

10. An electronic device, characterized in that, The electronic device includes: ontology; A multifunctional sound-generating device, wherein the multifunctional sound-generating device is any one of claims 1 to 9, and the multifunctional sound-generating device is installed on the body.

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