CN111293417A - Antenna, intelligent communication equipment and manufacturing method of antenna - Google Patents
Antenna, intelligent communication equipment and manufacturing method of antenna Download PDFInfo
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- CN111293417A CN111293417A CN202010117291.8A CN202010117291A CN111293417A CN 111293417 A CN111293417 A CN 111293417A CN 202010117291 A CN202010117291 A CN 202010117291A CN 111293417 A CN111293417 A CN 111293417A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
- H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
- H01Q1/244—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas extendable from a housing along a given path
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
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Abstract
The invention discloses an antenna, intelligent communication equipment and a manufacturing method of the antenna. The antenna comprises a first support, an antenna body and a second support, wherein the antenna body is formed on the surface of the first support through an LDS (laser direct structuring) process; the second support is arranged on one surface of the first support, which is provided with the antenna body, so that the antenna body is positioned between the first support and the second support; wherein the first bracket and the second bracket are both formed by injection molding. For the antenna, the antenna body is arranged between the first support and the second support, so that the influence of factors such as scraping and collision on the performance of the antenna body is effectively avoided, and the use reliability of the antenna is improved; because first support and second support all form through moulding plastics, the clearance between antenna and the second support is eliminated to a certain extent for the offset between antenna and the second support reduces, thereby makes the uniformity of antenna better.
Description
Technical Field
The invention relates to the field of intelligent communication equipment, in particular to an antenna, intelligent communication equipment and a manufacturing method of the antenna.
Background
Along with the development of mobile communication technology, the application of the intelligent handheld and wearable terminal is more and more popular, and the intelligent handheld and wearable terminal relies on an antenna for receiving and transmitting signals. The space that the terminal was left for the antenna is handheld and dressed to intelligence is less, also constantly improving to the performance requirement of antenna simultaneously, and traditional FPC antenna, sheetmetal antenna can not satisfy above-mentioned requirement already. At present, most mobile phone part manufacturers adopt an LDS (laser direct structuring) process to realize antenna circuit wiring. The LDS antenna technology is a Laser-Direct-structuring technology (Laser-Direct-structuring), which uses a computer to control the movement of Laser according to the trace of a conductive pattern, so as to project the Laser onto a molded three-dimensional plastic device, and activate a circuit pattern within a few seconds. Briefly (for the design and production of the mobile phone antenna), a metal antenna is formed on a molded plastic support by directly plating the support by using a laser technology.
The antenna consistency refers to the consistency of the parameter performance of the antenna products of the same model, which requires that the performance difference of all antennas in the production cannot exceed the tolerance threshold allowed by the performance, and the antenna performance exceeding the threshold cannot meet the design requirement standard.
In the prior art, an antenna using LDS is usually disposed on an antenna support, and the outside of the antenna is adhered by using the outer wall of the housing as a decoration, so that the antenna is sealed between the support and the outer wall of the housing. Because the gluing mode is adopted, the gluing gap is formed between the support and the outer wall of the shell, and the thickness of the outer wall of the shell is at least 0.7 mm-1 mm, under the condition that the total thickness of the mobile phone is not changed, the thickness of the outer wall of the shell and the gluing gap enable the antenna to be closer to the main board, and the clearance of the antenna is reduced; in addition, the width of the reserved adhesive position in the antenna wiring area is large, the structural design buckle position is adopted, and the antenna wiring area is limited. Antenna performance is affected by reduced antenna headroom and limited routing area. Due to the adoption of the gluing mode, the offset between the antenna and the decorating part is large, the tolerance is large, and the consistency of the antenna is poor.
Disclosure of Invention
The invention aims to overcome the defect of poor antenna consistency in the prior art and provides an antenna, intelligent communication equipment and a manufacturing method of the antenna.
The invention solves the technical problems through the following technical scheme:
an antenna, characterized in that it comprises:
a first bracket;
the antenna body is formed on the surface of the first support through an LDS (laser direct structuring) process;
the second support is arranged on one surface, provided with the antenna body, of the first support, so that the antenna body is positioned between the first support and the second support;
wherein the first bracket and the second bracket are both formed by injection molding.
In the scheme, when the antenna is applied to the intelligent communication equipment, the first support can be used as a carrier of the antenna body, the second support can be used as an outer wall of a machine shell or a decoration part, and the antenna body is arranged between the first support and the second support, so that the influence of factors such as scraping and collision on the performance of the antenna body is avoided; because first support and second support all form through moulding plastics, compare in the great gluing clearance between antenna body and casing outer wall or decoration, the clearance between antenna body and the second support can be controlled in very little scope for the offset between antenna body and the second support reduces, thereby makes the uniformity of antenna better.
Preferably, the first support has a through hole, and the antenna body passes through the through hole from the upper surface of the first support and extends to the lower surface of the first support; the upper surface is a surface of the first support having the antenna body, and the lower surface is opposite to the upper surface.
In this scheme, the antenna body is routed from the upper surface to the lower surface through the through hole, so that the antenna body of the lower surface can be electrically connected to the main board of the communication device.
Preferably, the thickness of the second bracket is 0.4mm to 0.7 mm.
In this scheme, for the inside of affixing the antenna to the casing outer wall that thickness is 0.7mm ~ 1mm, the thickness of the second support that forms of moulding plastics is littleer, when the second support was as the casing, under the unchangeable circumstances of the whole thickness of intelligent communication equipment, the distance between the mainboard of antenna body and communication equipment is bigger to increase the antenna headroom, make the performance reinforcing of antenna.
Preferably, the antenna body includes main antenna, GPS antenna and WIFI antenna, wherein, main antenna set up in first support is along the first half of antenna body extending direction, GPS antenna and WIFI antenna set up in first support is along the latter half of antenna body extending direction.
In this scheme, when the antenna was used to intelligent communications facilities, and intelligent communications facilities was the intelligent wrist-watch, arranged main antenna, GPS antenna and WIFI antenna according to above-mentioned mode, reducible wearer's arm and health are to the influence of antenna performance to promote the performance of antenna.
An intelligent communication device is characterized by comprising the antenna, wherein a shell of the intelligent communication device is used as the second support, and the first support is positioned in the shell.
In this scheme, regard the second support as intelligent communications facilities's shell for the thickness of shell reduces, thereby makes the distance between antenna and the mainboard increase, thereby increases the antenna headroom, promotes the performance of antenna.
The utility model provides an intelligent communication equipment, includes display screen and shell, its characterized in that, intelligent communication equipment still includes above-mentioned antenna, the antenna is located in the shell, and be located the below of display screen, the second support for first support is closer to the display screen.
In this scheme, compare in the shell, the distance of display screen and mainboard is farther, sets up the antenna in the display screen below, but furthest increases the antenna headroom, promotes the performance of antenna.
The manufacturing method of the antenna is characterized by comprising the following steps:
s10, forming a first bracket through an injection molding process;
s20, forming the antenna body on the first bracket by adopting an LDS process;
and S30, forming a second support on the surface of the first support, which is provided with the antenna body, through an injection molding process, so that the antenna body is positioned between the first support and the second support.
Preferably, the step S20 includes the steps of:
s21, carrying out laser etching LDS routing on the first support;
the laser power of the laser etching LDS routing is 4W to 8W;
and/or the laser moving speed of the laser etching LDS routing is 1000 mm/S-3000 mm/S;
and/or the laser frequency of the laser etching LDS routing is 30KHz to 70 KHz;
and/or the laser-etched LDS routing generates textures comprising a first group of lines and a second group of lines on the first support, wherein the first group of lines and the second group of lines respectively comprise a plurality of mutually parallel lines, the distance between two adjacent lines in the first group of lines is 0.01-0.1 mm, and the distance between two adjacent lines in the second group of lines is 0.01-0.1 mm;
and/or the first group of lines and the second group of lines form an included angle of 45 degrees or an included angle of 90 degrees.
In this scheme, set up the texture as above on the first support for the cladding material is difficult for droing, is favorable to the cladding material to adhere to on the first support more firmly.
Preferably, after the step S21, the manufacturing method further includes the steps of:
s22, forming a plating layer on the surface of the first support through LDS chemical plating to form the antenna body;
wherein the components of the plating layer are respectively copper and nickel or copper and gold from inside to outside; the thickness of each component of the plating layer is respectively as follows: copper 12 μm to 25 μm, nickel 2 μm to 4 μm, gold 0.1 μm to 0.15 μm.
In the scheme, the copper layer is used as an antenna body, the thickness of the copper layer is set to be 12-25 μm, if the thickness of the copper layer is lower than the range, the adhesion effect of the copper layer is poor, and the copper layer is easy to fall off in use so as to influence the performance of the antenna; if the thickness of the copper layer is higher than the above range, the chemical plating process takes longer time and costs more, which affects the production efficiency. And a layer of nickel or gold is plated on the copper layer to play a role of oxidation resistance. Since gold has oxidation resistance superior to nickel, the thickness of the gold layer may be set smaller than that of the nickel layer if both are to achieve the same or approximately the same oxidation resistance.
Preferably, in the step S30, the injection molding process has at least three sections, the initial material temperature of the injection molding material of the second bracket is 250 ℃ to 280 ℃, and the material temperature of each subsequent section is sequentially decreased by 5 ℃; the injection speed of the injection molding process is 25-100 mm/s.
In the scheme, the material temperature is selected, so that on one hand, the influence of overhigh injection molding material temperature on the state of the antenna is prevented; on the other hand, it is also prevented that the temperature is too low to be advantageous for the molding of the second holder. In addition, the injection speed of the injection molding process for forming the second support is 25-100 mm/s, the injection speed is high, the time for forming the second support can be shortened, and therefore the first support is prevented from being melted in the process of forming the second support.
On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.
The positive progress effects of the invention are as follows:
for the antenna, the antenna body is arranged between the first support and the second support, the antenna body is better in airtightness, meanwhile, the influence of factors such as scraping and collision on the performance of the antenna body is effectively avoided, the use reliability of the antenna is improved, and the service life of the antenna is prolonged; because first support and second support all form through moulding plastics, the clearance between antenna and the second support is eliminated to a certain extent for the offset between antenna and the second support reduces, thereby makes the uniformity of antenna better, has improved the yields of antenna production.
Drawings
Fig. 1 is a schematic perspective view of an antenna according to embodiment 1 of the present invention.
Fig. 2 is a partial sectional view of an antenna according to embodiment 1 of the present invention.
Fig. 3 is a sectional view showing the position of a through hole of an antenna according to embodiment 1 of the present invention.
Fig. 4 is a schematic perspective view of an antenna body according to embodiment 1 of the present invention.
Fig. 5 is a flowchart of a method for manufacturing an antenna according to embodiment 2 of the present invention.
Description of reference numerals:
Through-hole 204
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
Example 1
In the present embodiment, as shown in fig. 1 and 2, the antenna includes a first support 10, an antenna body 20, and a second support 30. Wherein, the antenna body 20 is formed on the surface of the first support 10 by an LDS process; the second support 30 is disposed on the side of the first support 10 having the antenna body 20, such that the antenna body 20 is located between the first support 10 and the second support 30; the first bracket 10 and the second bracket 30 are each formed by injection molding.
In this embodiment, when the antenna is applied to an intelligent communication device, the first bracket 10 may serve as a carrier of the antenna body, the second bracket 30 may serve as an outer wall of a housing or a decoration, and the antenna body 20 is disposed between the first bracket 10 and the second bracket 30, so as to avoid the factors such as scraping and collision from affecting the performance of the antenna body 20; because first support 10 and second support 30 are all formed through moulding plastics, compare in the great gluing clearance between antenna body 20 and casing outer wall or decoration, the clearance between antenna body 20 and the second support 30 can be controlled at very little scope for the offset between antenna body 20 and the second support 30 reduces, thereby makes the uniformity of antenna better. It should be noted that the smart communication device mentioned herein may be a smart phone or a smart watch.
As shown in fig. 3 and 4, the first support 10 has a through hole 204, and the antenna body 20 passes through the through hole 204 from the upper surface of the first support 10 and extends to the lower surface of the first support 10; the upper surface is a surface of the first bracket 10 having the antenna body 20, and the lower surface is opposite to the upper surface.
In the present embodiment, the antenna body 20 is routed from the upper surface to the lower surface of the first bracket 10 through the through hole 204, so that the antenna body 20 on the lower surface can be electrically connected to the main board of the communication device.
The thickness of the second support 30 is 0.4mm to 0.7mm, wherein, for the inside of attaching the antenna to the outer wall of the casing with the thickness of 0.7mm to 1mm, the thickness of the second support 30 formed by injection molding is smaller, when the second support 30 is used as the casing, under the condition that the whole thickness of the intelligent communication equipment is not changed, the distance between the antenna body 20 and the main board of the communication equipment is larger, thereby increasing the clearance of the antenna and enhancing the performance of the antenna.
As shown in fig. 4, the antenna body 20 includes a main antenna 201, a GPS antenna 202, and a WIFI antenna 203, where the main antenna 201 is disposed on the upper half portion of the first support 10 along the extending direction of the antenna body 20, and the GPS antenna 202 and the WIFI antenna 203 are disposed on the lower half portion of the first support 10 along the extending direction of the antenna body 20.
In this embodiment, when the antenna is applied to the smart communication device and the smart communication device is a smart watch, the main antenna 201, the GPS antenna 202 and the WIFI antenna 203 are arranged in the above manner, so that the influence of the arm and the body of the wearer on the performance of the antenna can be reduced, and the performance of the antenna can be improved.
The present embodiment also provides an intelligent communication device comprising the above antenna, wherein the housing of the intelligent communication device is used as the second support 30, and the first support 10 is located inside the housing. The intelligent communication device can be a smart phone or a smart watch.
In this embodiment, the second bracket 30 is used as the housing of the intelligent communication device, so that the thickness of the housing is reduced, the distance between the antenna and the main board is increased, the clearance of the antenna is increased, and the performance of the antenna is improved.
The embodiment further provides an intelligent communication device, which comprises a display screen, a housing and the antenna, wherein the antenna is located in the housing and below the display screen, and the second support 30 is closer to the display screen than the first support 10. The intelligent communication device can be a smart phone or a smart watch.
In this embodiment, compare in the shell, the distance of display screen and mainboard is farther, sets up the antenna in the display screen below, can furthest increase the antenna headroom, promotes the performance of antenna.
Example 2
The present embodiment provides a method for manufacturing the antenna described in embodiment 1. Wherein, the same reference numerals as in embodiment 1 denote the same structures in this embodiment. As shown in fig. 5, the manufacturing method of the antenna includes the following steps: s10, forming the first bracket 10 through an injection molding process; s20, forming the antenna body 20 on the first support 10 by adopting an LDS process; s30, forming the second bracket 30 on the side of the first bracket 10 having the antenna body 20 by an injection molding process such that the antenna body 20 is located between the first bracket 10 and the second bracket 30.
Step S20 includes the steps of: s21, performing laser etching LDS routing on the first support 10; the laser power of the laser etching LDS routing is 4W to 8W; the laser moving speed of the laser carving LDS routing is 1000 mm/S-3000 mm/S; the laser frequency of the laser carving LDS routing is 30KHz to 70 KHz; the laser etching LDS routing generates textures comprising a first group of lines and a second group of lines on the first support 10, wherein the first group of lines and the second group of lines respectively comprise a plurality of lines which are parallel to each other, the distance between two adjacent lines in the first group of lines is 0.01-0.1 mm, and the distance between two adjacent lines in the second group of lines is 0.01-0.1 mm; the first set of lines and the second set of lines form a 45 degree angle or a 90 degree angle.
In the present embodiment, the laser etching refers to a laser engraving technique in which laser is irradiated onto the first support 10, and the light energy of the laser causes chemical and physical changes of the surface material of the first support 10 to etch traces, thereby activating a desired trace pattern. The texture is arranged on the first support 10, so that the plating layer attached by chemical plating is not easy to fall off, and the plating layer is more stably attached to the first support 10.
After step S21, the manufacturing method further includes the steps of: s22, forming a plating layer on the surface of the first support 10 by LDS electroless plating to form the antenna body 20; wherein, the components of the plating layer are respectively copper and nickel or copper and gold from inside to outside; the thicknesses of the components of the plating layer are respectively as follows: copper 12 μm to 25 μm, nickel 2 μm to 4 μm, gold 0.1 μm to 0.15 μm.
In this embodiment, the principle of the electroless plating (electroless plating) technique is a method of forming a dense plating layer by reducing metal ions to metal in a solution containing metal ions by a strong reducing agent based on the principle of a redox reaction and depositing the metal ions on the surface of a material (first rack). Specifically, in the electroless plating process, the rate of copper plating should be as slow as possible so that copper is more uniformly and stably attached to the surface of the first support 10, thereby improving the adhesion of the copper layer. The copper layer is used as an antenna body, the thickness of the copper layer is set to be 12-25 μm, if the thickness of the copper layer is lower than the range, the adhesion effect of the copper layer is poor, and the copper layer is easy to fall off in use so as to influence the performance of the antenna; if the thickness of the copper layer is higher than the above range, the chemical plating process takes longer time and costs more, which affects the production efficiency. A layer of nickel or gold is plated on the copper layer to play a role of oxidation resistance, so that the service life of the antenna body 20 is prolonged. Since gold has oxidation resistance superior to nickel, the thickness of the gold layer may be set smaller than that of the nickel layer if both are to achieve the same or approximately the same oxidation resistance.
In step S30, the injection molding process has at least three segments, where the initial material temperature in the injection molding process is the initial material temperature, the initial material temperature of the injection molding material of the second bracket 30 is 250 ℃ to 280 ℃, and the material temperature of each segment at the back is sequentially decreased by 5 ℃; the injection speed of the injection molding process is 25-100 mm/s.
In the present embodiment, the material temperature is selected as described above, so that on one hand, the condition of the antenna is prevented from being affected by the excessively high temperature of the injection molding material; on the other hand, it is also prevented that the temperature is too low to be advantageous for the molding of the second holder. In addition, the injection speed of the injection molding process for forming the second bracket 30 is 25-100 mm/s, the injection speed is high, the time for forming the second bracket 30 can be shortened, and therefore the first bracket 10 is prevented from being melted in the process of forming the second bracket 30.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore, should not be construed as limiting the present invention unless otherwise specified herein.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (10)
1. An antenna, characterized in that the antenna comprises:
a first bracket;
the antenna body is formed on the surface of the first support through an LDS (laser direct structuring) process;
the second support is arranged on one surface, provided with the antenna body, of the first support, so that the antenna body is positioned between the first support and the second support;
wherein the first bracket and the second bracket are both formed by injection molding.
2. The antenna of claim 1, wherein the first support has a through hole, the antenna body passing through the through hole from an upper surface of the first support and extending to a lower surface of the first support; the upper surface is a surface of the first support having the antenna body, and the lower surface is opposite to the upper surface.
3. The antenna of claim 1, wherein the second support has a thickness of 0.4mm to 0.7 mm.
4. The antenna of any one of claims 1-3, wherein the antenna body comprises a main antenna, a GPS antenna, and a WIFI antenna, wherein the main antenna is disposed on an upper half of the first bracket in a direction of antenna extension, and the GPS antenna and the WIFI antenna are disposed on a lower half of the first bracket in the direction of antenna extension.
5. An intelligent communications device, comprising an antenna according to any of claims 1-4, wherein a housing of the intelligent communications device serves as the second support, and wherein the first support is located inside the housing.
6. An intelligent communications device comprising a display screen and a housing, wherein the intelligent communications device further comprises an antenna according to any one of claims 1 to 4, the antenna being located within the housing and below the display screen, the second support being closer to the display screen than the first support.
7. A method of manufacturing an antenna according to any of claims 1 to 4, comprising the steps of:
s10, forming a first bracket through an injection molding process;
s20, forming the antenna body on the first bracket by adopting an LDS process;
and S30, forming a second support on the surface of the first support, which is provided with the antenna body, through an injection molding process, so that the antenna body is positioned between the first support and the second support.
8. The method for manufacturing an antenna according to claim 7, wherein the step S20 includes the steps of:
s21, carrying out laser etching LDS routing on the first support;
the laser power of the laser etching LDS routing is 4W to 8W;
and/or the laser moving speed of the laser etching LDS routing is 1000 mm/S-3000 mm/S;
and/or the laser frequency of the laser etching LDS routing is 30KHz to 70 KHz;
and/or the laser-etched LDS routing generates textures comprising a first group of lines and a second group of lines on the first support, wherein the first group of lines and the second group of lines respectively comprise a plurality of mutually parallel lines, the distance between two adjacent lines in the first group of lines is 0.01-0.1 mm, and the distance between two adjacent lines in the second group of lines is 0.01-0.1 mm;
and/or the first group of lines and the second group of lines form an included angle of 45 degrees or an included angle of 90 degrees.
9. The method of manufacturing an antenna according to claim 7, wherein after the step S21, the method further comprises the steps of:
s22, forming a plating layer on the surface of the first support through LDS chemical plating to form the antenna body;
wherein the components of the plating layer are respectively copper and nickel or copper and gold from inside to outside; the thickness of each component of the plating layer is respectively as follows: copper 12 μm to 25 μm, nickel 2 μm to 4 μm, gold 0.1 μm to 0.15 μm.
10. The method of claim 7, wherein in the step S30, the injection molding process has at least three sections, the initial material temperature of the injection molding material in the injection molding process is an initial material temperature, the initial material temperature of the injection molding material of the second bracket is 250 ℃ to 280 ℃, and the material temperature of each subsequent section is sequentially decreased by 5 ℃; the injection speed of the injection molding process is 25-100 mm/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010117291.8A CN111293417A (en) | 2020-02-25 | 2020-02-25 | Antenna, intelligent communication equipment and manufacturing method of antenna |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010117291.8A CN111293417A (en) | 2020-02-25 | 2020-02-25 | Antenna, intelligent communication equipment and manufacturing method of antenna |
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| CN111293417A true CN111293417A (en) | 2020-06-16 |
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| CN202010117291.8A Pending CN111293417A (en) | 2020-02-25 | 2020-02-25 | Antenna, intelligent communication equipment and manufacturing method of antenna |
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Cited By (1)
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| CN112002991A (en) * | 2020-08-27 | 2020-11-27 | 努比亚技术有限公司 | Antenna structure and wearable equipment |
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| CN112002991B (en) * | 2020-08-27 | 2024-02-09 | 努比亚技术有限公司 | Antenna structure and wearable equipment |
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Application publication date: 20200616 |