CN218548795U - Electronic device - Google Patents

Abstract

The utility model relates to an electronic equipment. The electronic equipment comprises a bracket and an antenna; the bracket is connected with an excitation unit; the antenna comprises a feed part and a radiator; the feeding portion is electrically connected with the bracket and is configured to input an electric signal to the excitation unit through the bracket; the exciting unit is configured to generate an electric field according to the electric signal and feed a radio frequency signal into the radiator; the radiator is configured to radiate and receive radio frequency signals. The electronic device connects and fixes the excitation unit on the bracket, so that the antenna signal is transmitted to the bracket and the excitation unit connected with the bracket by the feeding part, and is fed into the radiator through the processes of coupling feeding between the excitation unit and the radiator and the like, and the radiator radiates the radio frequency signal outwards. Compare in conventional antenna receiving and dispatching signal's mode, the utility model discloses an electronic equipment can realize better antenna performance to can help electronic equipment to realize miniaturization, frivolousization and big screen on the whole and account for the ratio.

Description

Electronic device

Technical Field

The utility model relates to an antenna technology field especially relates to an electronic equipment.

Background

In the existing electronic equipment such as a smart watch and a mobile phone, an antenna is a necessary component for realizing interaction with an external signal, the performance of the antenna directly determines the communication performance of the electronic equipment, and the use experience of the electronic equipment and even the realization of corresponding functions are directly influenced.

For electronic equipment such as smartwatches and mobile phones, miniaturization, lightness, thinness and larger screen ratio are continuous development directions, which all provide challenges for the structural design inside the electronic equipment and bring greater difficulty. Particularly, for the antenna modules in these electronic devices, the sacrifice of miniaturization, lightness, thinness, and larger screen occupation ratio leads to poor signals of some existing electronic devices.

SUMMERY OF THE UTILITY MODEL

The utility model provides an electronic equipment to solve among the above-mentioned prior art electronic equipment for realizing miniaturization, frivolousization and big screen account for than and lead to the relatively poor technical problem of antenna performance.

The utility model provides an electronic device, which comprises a bracket and an antenna; the bracket is connected with an excitation unit; the antenna comprises a feed part and a radiator; the feeding section is electrically connected to the bracket and configured to input an electrical signal to the exciting unit through the bracket; the excitation unit is configured to generate an electric field according to the electric signal and feed a radio frequency signal to the radiator; the radiator is configured to radiate and receive radio frequency signals.

The electronic equipment comprises a mainboard, a clearance area is arranged on the mainboard, the clearance area divides the mainboard into a main body part and a split part, a first conductive part is arranged on the split part, and the first conductive part is used as a radiating body of the antenna.

Wherein the feeding portion is connected to the first conductive portion.

The main body part is provided with a second conductive part and a grounding end; the antenna is connected to the ground terminal of the main body.

The electronic equipment further comprises a first device unit, wherein the first device unit comprises a third conductive part connected with the first conductive part.

The first device unit is a camera.

Wherein, the clearance area is gap form.

The clearance area is arranged in the length direction or the width direction of the main board and is adjacent to any side edge of the main board.

Wherein the bracket has an edge shape substantially corresponding to the main plate.

And the projection of the main board on the plane of the bracket is positioned in the edge of the bracket.

The bracket is a whole pattern, or the bracket is provided with a hollow pattern.

The utility model provides an above-mentioned electronic equipment compares with prior art and has following advantage:

the utility model provides an electronic equipment, its fixed excitation unit of connection on the bracket makes antenna signal transmit the bracket and with bracket connection's excitation unit by feed portion, in process such as coupling feed between excitation unit and the irradiator feed into the irradiator, by the outside radio frequency signal that radiates of irradiator. Compare in conventional antenna receiving and dispatching signal's mode, the utility model discloses an electronic equipment can realize better antenna performance to can help electronic equipment to realize miniaturization, frivolousization and big screen on the whole and account for the ratio.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.

Fig. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present invention;

FIG. 2 is a schematic view of the electronic device shown in FIG. 1 from another viewing angle;

FIG. 3 is a schematic view of the electronic device (without the housing) shown in FIG. 1;

FIG. 4 is a schematic diagram of the electronic device (without the housing and the display) shown in FIG. 1;

FIG. 5 is a schematic diagram of the electronic device shown in FIG. 4 in a top view;

FIG. 6 is a schematic view of the electronic device shown in FIG. 4 in a bottom view;

fig. 7 is a schematic structural diagram of a main board of an electronic device according to another embodiment of the present invention;

fig. 8 is a schematic structural diagram of a main board of an electronic device according to another embodiment of the present invention;

fig. 9 is a schematic structural diagram of a main board of an electronic device according to another embodiment of the present invention;

fig. 10 is a schematic structural diagram of a main board of an electronic device according to another embodiment of the present invention;

fig. 11 is a schematic structural diagram of a main board of an electronic device according to another embodiment of the present invention;

FIG. 12 is a schematic view of the bracket in a full-face configuration;

FIG. 13 is a schematic view of a bracket with a rectangular cutout;

FIG. 14 is a schematic view of a bracket with two right-angled triangular cutouts;

FIG. 15 is a schematic view of a tray having four right triangle cut-out patterns separated by diamond patterns;

FIG. 16 is a schematic view of a tray having four cutouts separated by ellipses;

FIG. 17 is a schematic view of a tray having two rectangular cutouts separated by a cross-bar;

FIG. 18 is a schematic view of a bracket having a full-face configuration and a rounded rectangle.

In the figure:

10-a main board; 11-a clearance zone; 12-a body portion; 13-a split portion;

20-an antenna; 21-a feeding part; 22-a radiator; 23-an excitation unit;

30-a bracket; 301-hollowed out pattern;

40-a first device cell; 401-a third conductive portion;

50-a housing; 60-a display screen; 70-a battery; 80-a speaker; 90-push button; 100-watchband.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions 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, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Embodiments of the electronic device provided by the present invention are described below with reference to the drawings.

In this embodiment, the electronic device may implement a communication function by using a communication technology, for example: bluetooth (BT) communication technology, global Positioning System (GPS) communication technology, wireless fidelity (Wi Fi) communication technology, global system for mobile communications (GSM) communication technology, wideband Code Division Multiple Access (WCDMA) communication technology, long Term Evolution (LTE) communication technology, 5G communication technology, sub 6G communication technology, future other communication technologies, and the like. For example, the electronic device may employ one communication technology or may employ multiple communication technologies, which is not limited by the present invention.

In an embodiment of the electronic device of the present invention, referring to fig. 1 to 6, the electronic device includes a main board 10, an antenna 20, and a bracket 30.

The bracket 30 is a structural member of the electronic device, which belongs to a component of an outer frame of the electronic device, and can be specifically used for connecting or installing and fixing related devices. When the electronic device is a smart watch, the bracket 30 may be a structural member located at the bottom side of the smart watch, and in this structure, the watch band 100 may be fixedly connected to the bracket 30; meanwhile, a hole structure may be reserved on the bracket 30, and the hole structure exposes a sensor, a SIM card slot, or a vibration motor and the like on the bottom side of the smart watch to implement a corresponding function, for example, the exposed sensor may contact the wrist of the user to collect related physiological information of the user, and the exposed SIM card slot facilitates installation of the SIM card. In this embodiment, the bracket 30 may be made of a conductive metal material, or may be made of a conductive rubber or a conductive plastic material.

As shown in fig. 4 and 5, the antenna 20 includes a feeding portion 21, a radiator 22, and an excitation unit 23. The exciting unit 23 is connected and fixed on the bracket 30, and forms an electrical connection with the bracket 30; that is, the bracket 30 functions to structurally fix the exciting unit 23 and to transmit an electric signal to and from the exciting unit 23, in addition to the exciting unit 23. In addition, the exciting unit 23 is generally located at a short distance from the radiator 22, so that the transmission of signals between the two is realized by means of coupling feeding and the like. For example, the distance between the excitation unit 23 and the radiator 22 may be controlled to be less than 2mm, 1mm, 0.1mm, or the like, and the coupling between the excitation unit 23 and the radiator 22 is stronger as the distance therebetween is smaller. The feeding section 21 is electrically connected to the cradle 30, and is configured to input an electrical signal to the excitation unit 23 via the cradle 30; the excitation unit 23 is configured to generate an electric field according to the electric signal and feed a radio frequency signal to the radiator 22. The radiator 22 is configured to radiate and receive radio frequency signals.

In this embodiment, the principle and process of transceiving signals by the antenna are substantially identical to those of the conventional antenna. Specifically, a Central Processing Unit (CPU) of the electronic device or the like is used as a feed source, the feed source transmits an electrical signal to the excitation unit 23 through the feed portion 21 and the bracket 30, the excitation unit 23 transmits a radio frequency signal to the radiator 22 according to a coupling mode with the radiator 22, and the radiator 22 further radiates the radio frequency signal. Specifically, the signal radiated and received by the radiator 22 may be one or more of a navigation positioning signal (such as a GPS signal, a beidou navigation signal, etc.), a WIFI signal, a 4G signal, and a 5G signal, so as to respectively realize functions of position positioning, WIFI connection, mobile data connection, and the like of the electronic device.

In this embodiment, the excitation unit 23 is connected and fixed on the bracket 30, and the connection and fixation between the excitation unit 23 and the bracket 30 may be mechanical connection, that is, the excitation unit 23 and the bracket 30 are two independent structural members, and the two structural members may be connected and fixed by bonding, clamping, screwing, or the like. In addition, the excitation unit 23 and the bracket 30 may be integrally formed, that is, the excitation unit 23 and the bracket 30 are essentially one structural member, and only different parts of the structural member respectively play different roles and are distinguished as the bracket 30 and the excitation unit 23; in this structure, the excitation unit 23 may be regarded as a protrusion of the bracket 30 further extending toward the radiator 22. It will be appreciated that the process of manufacture and assembly is made easier and easier when the excitation unit 23 and the radiator 22 are formed as a single integral structural member.

In this embodiment, the excitation unit 23 is connected and fixed to the bracket 30, so that the antenna signal is transmitted from the feeding portion 21 to the bracket 30 and the excitation unit 23 connected to the bracket 30, and is fed to the radiator 22 through a coupling feeding process between the excitation unit 23 and the radiator 22, and the radio frequency signal is radiated from the radiator 22. Compared with a conventional mode of transmitting and receiving signals by an antenna, in the embodiment, the antenna of the electronic device can achieve better antenna performance. Specifically, take GPS navigation positioning signal as an example, its signal strength can promote 6dB, take WIFI2G signal as an example, its signal strength can promote 4dB.

In one embodiment of the electronic device, as shown in fig. 4 and 5, a clearance 11 is provided on the motherboard 10, the clearance 11 divides the motherboard 10 into a main body portion 12 and a split portion 13, and the split portion 13 is provided with a first conductive portion as a radiator 22 of the antenna 20.

In this embodiment, the main Board 10 may be a Printed Circuit Board (PCB). A PCB generally includes an insulating substrate, and a conductive layer and an electronic component formed on the insulating substrate, and in an electronic device, the PCB generally functions to realize electrical connection and mount the electronic component.

In this embodiment the clearance 11 may be embodied as a slot in the PCB, which divides the PCB into two parts, a main part 12 and a separate part 13. Wherein, the main body 12 is provided with a conductive layer for realizing electric connection, and is provided with electronic components; that is, the main body 12 is a main body of the PCB, and in the PCB, each function of the PCB itself is mainly realized by the main body 12; the split portion 13 is mainly used for providing a first conductive portion, and the first conductive portion is used as a radiator of the antenna 20.

The first conductive part provided in the separate part 13 may be made of a conductive metal material, a conductive rubber, a conductive plastic, or the like.

Compared with the antenna arrangement mode in the existing electronic device in a limited space to meet the requirements of miniaturization, light weight, thinness, large screen occupation ratio and the like, in the embodiment, the clearance area 11 is formed on the main board 10, and the first conductive part arranged in the split part 13 separated by the clearance area 11 is used as a radiator, so that better antenna performance can be further realized; specifically, taking GPS navigation positioning signal as an example, its signal strength can promote 4dB, taking WIFI2G signal as an example, its signal strength can promote 2dB. Moreover, in the electronic device, there is no need to leave a large clearance area at the split part 13, and related devices containing metal materials can be arranged at the split part 13 without limitation, thereby facilitating the structural design and device arrangement inside the electronic device, and also facilitating the realization of miniaturization, light weight, large screen occupation ratio and the like of the electronic device.

In an embodiment of the electronic device, the feeding portion 21 may also be directly connected to the first conductive portion, so as to implement direct feeding of the radio frequency signal from the feeding portion 21 to the radiator 22, thereby enhancing the strength of the radio frequency signal received by the radiator 22, and contributing to obtain better antenna performance.

In one embodiment of the electronic device, the main body 12 is provided with a second conductive part and has a ground GND. The antenna 20 is connected to the ground GND of the main body 12.

In particular, the second conductive portion may be embodied as one or more conductive layers, with insulating layers separating adjacent layers when the conductive layers are multi-layered. In this embodiment, the one or more conductive layers are used to mount and connect the electronic devices to the motherboard 10 and to electrically connect the electronic devices.

The main body 12 of the main board 10 is provided with a ground GND. In the present embodiment, the antenna 20 is connected to the second conductive part and connected to the ground GND through the second conductive part, so that the noise in the radiated or received signal can be reduced and the signal quality can be improved.

In one embodiment of the electronic device, as shown in fig. 1 to 5, the electronic device further comprises a first device unit 40, and the first device unit 40 comprises a third conductive portion 401 connected to the first conductive portion.

Specifically, the first device unit 40 may be a camera, and the camera usually has a metal structure, and the metal structure is connected to the first conductive part as the third conductive part 401 (for convenience of description, a non-metal but conductive structure in the camera or the first device unit 40 may be the third conductive part 401, and for convenience of description, a metal structure is described and explained below), and in this case, the metal structure in the camera can radiate a signal, which is equivalent to a part of the radiator 22 of the antenna 20, so that the performance of the antenna 20 can be further enhanced. In addition, taking the camera as an example, the camera is usually exposed on the external surface of the electronic device, and is not completely sealed by the housing structure of the electronic device (especially when the housing structure of the electronic device is metal), which can further enhance the efficiency and performance of the radiator for transmitting and receiving signals, thereby contributing to further improving the signal strength of the antenna.

In this embodiment, the first conductive part of the main board 10 and the metal structure of the first device unit 40 are used as radiators, and a LOOP antenna (LOOP antenna) may be formed to receive and transmit GPS L1 signals, WIFI2G signals, 5G signals, and the like, so that excellent antenna performance may be achieved without adding extra wires.

When the electronic device is a smart watch, the camera serving as the first device unit 40 may be a front camera mounted on a front panel of the smart watch; when the electronic device is a mobile phone, a tablet computer, or the like, the camera may be a rear camera of the mobile phone, the tablet computer, or the like, or a front camera thereof, or both the front camera and the rear camera thereof are the first device unit 40, and are connected to the first conductive part. In other embodiments of the electronic device, the first device unit 40 may also be a structural module other than a camera.

It is understood that the conductor connecting between the first and third conductive portions may also function as the radiator 22 of the antenna 20, i.e., as the radiator 22 of the antenna 20, and therefore, in fig. 4 and 5, the conductor connector between the first and third conductive portions 401 is labeled as the radiator 22, while it is also labeled as the third conductive portion 401 for simplicity, but it will be understood by those skilled in the art that this conductor connector is not generally considered to be an integral part of the first device cell 40.

In one embodiment of the electronic device, the clearance zone 11 is slit-shaped, as shown in fig. 4 and 5. Generally, the gap-shaped structure can reduce the area of the clearance area 11, so that the main body 12 or the separate body 13 can have a larger size to achieve the effects of more convenient electrical connection routing or better antenna performance. Specifically, the slot of the clearance 11 may be set to an integral multiple of a quarter wavelength in the length direction.

Specifically, the clearance area 11 may be disposed in a length direction or a width direction of the main board 10, and disposed adjacent to any one side edge of the main board 10. For example, in the embodiment shown in fig. 4 and 5, the clearance area 11 is disposed adjacent to the upper edge of the main board 10 and is disposed to the right side in the width direction of the main board 10, the main body 12 and the split portion 13 partitioned by the clearance area 11 are juxtaposed in the up-down direction, the split portion 13 is on the top, and the main body 12 is on the bottom; in the embodiment shown in fig. 7, the clearance area 11 is provided at a position adjacent to the edge of the upper left side of the main board 10, the main body 12 partitioned by the clearance area 11 is located at the lower right side, and the split part 13 is located at the upper left side; in the embodiment shown in fig. 8, the clearance 11 is provided at a position adjacent to the edge of the upper right side of the main board 10, the main body part 12 partitioned by the clearance 11 is located at the lower left side, and the split part 13 is located at the upper right side; in the embodiment shown in fig. 9, the clearance area 11 is disposed adjacent to the lower edge of the main board 10 and is disposed to the right side in the width direction of the main board 10, the main body 12 and the split portion 13 partitioned by the clearance area 11 are juxtaposed in the up-down direction, the main body 12 is on the top, and the split portion 13 is on the bottom; in the embodiment shown in fig. 10, the clearance area 11 is disposed adjacent to the lower edge of the main board 10 and is disposed on the left side in the width direction of the main board 10, the main body portion 12 and the split portion 13 partitioned by the clearance area 11 are juxtaposed in the up-down direction, the main body portion 12 is on the top, and the split portion 13 is on the bottom; in the embodiment shown in fig. 11, the clearance area 11 is provided at a position adjacent to the right edge of the main board 10 and on the upper side in the width direction of the main board 10, the main body portion 12 and the separate portion 13 partitioned by the clearance area 11 are juxtaposed in the left and right directions, the main body portion 12 is on the left, and the separate portion 13 is on the right.

Of the two portions separated by the clearance area 11, the portion between the clearance area 11 and the adjacent one side edge is a portion 13, and the other portion is a main body portion 12, so that the divided portion 13 separated by the clearance area 11 is smaller in size area than the main body portion 12. For electronic equipment, a certain area of PCB is needed for routing arrangement to achieve electrical connection of related devices, and the greater the area is, the lower the difficulty of routing arrangement is, and the easier the implementation is; while for the first conductive part as radiator 22, it generally does not need to be particularly large in size (as far as the usual needs of electronic devices are concerned); therefore, in this embodiment, the main body portion 12 is configured to have a larger size, and the separate portion 13 is configured to have a smaller size, so that the main body portion 12 and the separate portion 13 are balanced and compatible, each of which can achieve its functional purpose well.

In an embodiment of the electronic device, the electronic device may specifically be a smart watch, a mobile phone, a laptop, a tablet computer, or an e-book reader. Taking a smart watch as an example, in addition to the above structures, with reference to fig. 1 to 4, the electronic device further includes a housing 50, a display 60, a battery 70, a speaker 80, a button 90, a watch band 100, and other structures. Wherein, the battery 70, the speaker 80, etc. are installed in the housing 50 for respectively realizing the functions of power supply and sound emission; the main board 10 is also disposed in the housing 50 for arranging electronic components and conducting electrical connection traces of related devices; a display screen 60 for realizing display of a picture is mounted on the front side surface of the housing 50; the keys 90 are disposed on a surface of the housing 50, and may be disposed on a side surface of the housing 50, and the keys 90 are configured to be triggered to generate corresponding instructions, such as turning on, turning off, adjusting volume, turning on and off the display 60, and the like. The band 100 is fixedly connected to the bracket 30, and the connection between the two may be a detachable connection, so that the user can easily replace different bands 100.

In one embodiment of the electronic device, the edge shape of the bracket 30 substantially corresponds to the motherboard 10. Here, the substantially corresponding meaning means that the sizes of the main plate 10 and the bracket 30, either of which is not significantly larger than the other, may be embodied in: the distance between the projection of the main board 10 on the surface of the bracket 30 and the edge of the bracket 30 does not exceed a set value. The set value may be an absolute value or a ratio with respect to the size of the main board 10 or the bracket 30, and may also be a smaller value or a larger value in consideration of the absolute value and the ratio with respect to the size of the main board 10 or the bracket 30. For example, according to a general evaluation standard, when an absolute value is taken, the set value may be 5mm or 2 mm; the set value may for example take 5% of the dimensions of the main plate 10 or the bracket 30, when expressed in terms of a ratio relative to the dimensions of the main plate 10 or the bracket 30.

In particular, the projection of the main plate 10 on the plane of the bracket 30 is located within the edge of the bracket 10. That is, the overall size of the outer contour of the bracket 30 is slightly larger than that of the main board 10, and this arrangement is arranged so that the conductive portion as the excitation unit 23 extends from the edge of the bracket 30 in the direction of the radiator 22.

In an embodiment of the electronic device, the bracket 30 is a full-face figure, as shown in fig. 12 and 18; alternatively, the bracket 30 may be provided with the cut-out pattern 301. Specifically, when the cutout pattern 301 is provided in the bracket 30, the cutout pattern may have a shape as shown in fig. 13 to 17.

To sum up, the electronic device according to the above embodiment of the present invention connects and fixes the excitation unit 23 to the bracket 30, so that the antenna signal is transmitted from the feeding portion 21 to the bracket 30 and the excitation unit 23 connected to the bracket 30, and is fed into the radiator 22 through the coupling feeding between the excitation unit 23 and the radiator 22, and the radiator 22 radiates the radio frequency signal outwards. Compare in conventional antenna send and receive signal's mode, the utility model discloses a better antenna performance can be realized to electronic equipment's antenna to can help electronic equipment to realize miniaturization, frivolousization and big screen on the whole and account for the ratio.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.

The above description is merely illustrative of the invention and is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (11)

1. An electronic device, characterized in that the electronic device comprises a cradle and an antenna; the bracket is connected with an excitation unit; the antenna comprises a feed part and a radiator;

the feeding section is electrically connected to the bracket and configured to input an electrical signal to the exciting unit through the bracket; the excitation unit is configured to generate an electric field according to the electric signal and feed a radio frequency signal to the radiator;

the radiator is configured to radiate and receive radio frequency signals.

2. The electronic device according to claim 1, wherein the electronic device comprises a main board, and a clearance area is disposed on the main board, and the clearance area divides the main board into a main body portion and a split portion, and a first conductive portion is disposed on the split portion, and the first conductive portion serves as a radiator of the antenna.

3. The electronic device of claim 2, wherein the power feed is connected to the first conductive portion.

4. The electronic device according to claim 2, wherein the main body portion is provided with a second conductive portion and has a ground terminal;

the antenna is connected to the ground terminal of the main body.

5. The electronic apparatus according to claim 2, further comprising a first device unit including a third conductive portion connected to the first conductive portion.

6. The electronic apparatus according to claim 5, wherein the first device unit is a camera.

7. The electronic device of claim 2, wherein the clearance area is slit-shaped.

8. The electronic device of claim 7, wherein the clearance area is disposed in a length direction or a width direction of the main board and adjacent to any one side edge of the main board.

9. The electronic device of claim 2, wherein an edge shape of the bracket substantially corresponds to the motherboard.

10. The electronic device of claim 9, wherein a projection of the motherboard onto a plane of the tray is located within an edge of the tray.

11. The electronic device according to any one of claims 1 to 10, wherein the bracket is a full-surface pattern or is provided with a hollow pattern.

Images