CN109659671B - Communication terminal and antenna state control method - Google Patents
Communication terminal and antenna state control method Download PDFInfo
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- CN109659671B CN109659671B CN201811493831.1A CN201811493831A CN109659671B CN 109659671 B CN109659671 B CN 109659671B CN 201811493831 A CN201811493831 A CN 201811493831A CN 109659671 B CN109659671 B CN 109659671B
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- frame body
- metal sub
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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
- H01Q1/44—Details of, or arrangements associated with, antennas using equipment having another main function to serve additionally as an antenna, e.g. means for giving an antenna an aesthetic aspect
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
- H04M1/026—Details of the structure or mounting of specific components
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Support Of Aerials (AREA)
- Telephone Set Structure (AREA)
Abstract
The invention provides a communication terminal and an antenna state control method, wherein the communication terminal comprises a shell and a driving mechanism arranged in the shell, the shell comprises a metal frame body, and the metal frame body comprises a first metal sub-frame body, a second metal sub-frame body and a third metal sub-frame body; the first metal sub-frame body and the second metal sub-frame body are fixed on the shell, the first metal sub-frame body and the second metal sub-frame body are arranged separately, the third metal sub-frame body is connected with the driving mechanism, and the driving mechanism drives the third metal sub-frame body to be in a first state or drives the third metal sub-frame body to be in a second state; the first state is that the third metal sub-frame body is away from the second metal sub-frame body by a first distance and is used as a radiation main body of the communication terminal; the second state is a state that the three-metal sub-frame body is separated from the second metal sub-frame body by a second distance and coupled with the second metal sub-frame body and is used as a parasitic radiator of the communication terminal. The embodiment of the invention can meet the performance requirement of antenna radiation.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a communication terminal and an antenna state control method.
Background
With the rapid development of antenna technology, the use of a metal structure of a communication terminal housing as an antenna radiation unit has become a mainstream, and there is a housing which can be lifted and cannot be lifted in the metal structure of the housing. When the liftable frame body is relatively incapable of being extended or retracted, the radiation environment of the antenna is greatly changed, and the liftable frame body of the communication terminal cannot meet the performance requirement of antenna radiation when being extended or retracted.
Disclosure of Invention
The embodiment of the invention provides a communication terminal and an antenna state control method, which aim to solve the problem that a liftable frame body of the communication terminal cannot meet the performance requirement of antenna radiation when the liftable frame body extends out or retracts.
In order to solve the technical problem, the invention is realized as follows:
in a first aspect, an embodiment of the present invention provides a communication terminal, including a housing and a driving mechanism disposed in the housing, where the housing includes a metal frame, and the metal frame includes a first metal sub-frame, a second metal sub-frame, and a third metal sub-frame;
the first metal sub-frame body and the second metal sub-frame body are fixed on the shell, the first metal sub-frame body and the second metal sub-frame body are arranged separately, the third metal sub-frame body is connected with the driving mechanism, and the driving mechanism drives the third metal sub-frame body to be in a first state or drives the third metal sub-frame body to be in a second state;
the first state is a state that the third metal sub-frame body is away from the second metal sub-frame body by a first distance and is used as a radiation main body of the communication terminal;
the second state is a state that the three-metal sub-frame body is separated from the second metal sub-frame body by a second distance and coupled with the second metal sub-frame body and is used as a parasitic radiator of the communication terminal;
and when the third metal sub-frame body is in the first state, the second metal sub-frame body is grounded.
In a second aspect, an embodiment of the present invention further provides an antenna state control method, which is applied to a communication terminal, and includes a housing and a driving mechanism disposed in the housing, where the housing includes a metal frame, and the metal frame includes a first metal sub-frame, a second metal sub-frame, and a third metal sub-frame; the first metal sub-frame body and the second metal sub-frame body are fixed on the shell, the first metal sub-frame body and the second metal sub-frame body are arranged separately, the third metal sub-frame body is connected with the driving mechanism, and the antenna state control method comprises the following steps:
controlling the third metal sub-frame body to be in a first state, or controlling the third metal sub-frame body to be in a second state;
the first state is a state that the third metal sub-frame body is away from the second metal sub-frame body by a first distance and is used as a radiation main body of the communication terminal; the second state is a state in which the three-metal sub-frame body is separated from the second metal sub-frame body by a second distance and coupled with the second metal sub-frame body, and is used as a parasitic radiator of the communication terminal.
The communication terminal comprises a shell and a driving mechanism arranged in the shell, wherein the shell comprises a metal frame body, and the metal frame body comprises a first metal sub-frame body, a second metal sub-frame body and a third metal sub-frame body; the first metal sub-frame body and the second metal sub-frame body are fixed on the shell, the first metal sub-frame body and the second metal sub-frame body are arranged separately, the third metal sub-frame body is connected with the driving mechanism, and the driving mechanism drives the third metal sub-frame body to be in a first state or drives the third metal sub-frame body to be in a second state; the first state is a state that the third metal sub-frame body is away from the second metal sub-frame body by a first distance and is used as a radiation main body of the communication terminal; the second state is a state that the three-metal sub-frame body is separated from the second metal sub-frame body by a second distance and coupled with the second metal sub-frame body and is used as a parasitic radiator of the communication terminal; and when the third metal sub-frame body is in the first state, the second metal sub-frame body is grounded. In this way, the driving mechanism can drive the third metal sub-frame body to be in the first state or the second state, so that the performance requirement of antenna radiation can be met.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a communication terminal according to an embodiment of the present invention;
fig. 2 is a second schematic structural diagram of a communication terminal according to an embodiment of the present invention;
fig. 3 is a third schematic structural diagram of a communication terminal according to an embodiment of the present invention;
fig. 4 is a fourth schematic structural diagram of a communication terminal according to an embodiment of the present invention;
fig. 5 is a flowchart of an antenna state control method according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 and 2, fig. 1 and 2 are schematic structural diagrams of a communication terminal according to an embodiment of the present invention. As shown in fig. 1 and 2, the communication terminal includes a housing and a driving mechanism disposed in the housing, the housing includes a metal frame, and the metal frame includes a first metal sub-frame 1, a second metal sub-frame 2, and a third metal sub-frame 3; the first metal sub-frame body 1 and the second metal sub-frame body 2 are fixed to the shell, the first metal sub-frame body 1 and the second metal sub-frame body 2 are arranged separately, the third metal sub-frame body 3 is connected with the driving mechanism, and the driving mechanism drives the third metal sub-frame body 3 to be in a first state or drives the third metal sub-frame body 3 to be in a second state; the first state is a state that the third metal sub-frame body 3 is away from the second metal sub-frame body 2 by a first distance and is used as a radiation main body of the communication terminal; the second state is a state in which the three-metal sub-frame body 3 is separated from the second metal sub-frame body 2 by a second distance and coupled to the second metal sub-frame body, and is used as a parasitic radiator of the communication terminal; the first distance is greater than the second distance, and when the third metal sub-frame body 3 is in the first state, the second metal sub-frame body 2 is grounded.
In this embodiment, the second metal sub-frame body 2 and the third metal sub-frame body 3 may be metal components of the intermediate frame. The communication terminal can further comprise a feed source 4, and when the third metal sub-frame body 3 is in the first state or the second state, the feed source 4, the second metal sub-frame body 2 and the third metal sub-frame body 3 can have different connection states so as to meet the performance requirements of antenna radiation under different conditions.
In this embodiment, the first state is a state in which the third metal sub-frame 3 is separated from the second metal sub-frame 2 by a first distance and is used as a radiation subject of the communication terminal. The first distance may be a distance at which the third metal sub-frame 3 is farthest from the second metal sub-frame 2 in a process of being driven by the driving mechanism. And when the third metal sub-frame body 3 is in the first state, the third metal sub-frame body 3 is connected with the feed source 4, and is disconnected with the ground end, so as to be used as a radiation main body of the communication terminal. This may be as shown in figure 1.
In this embodiment, the second state is a state in which the tri-metal sub-frame 3 is coupled to the second metal sub-frame 2 at a second distance and is used as a parasitic radiator of the communication terminal. The second distance may be a distance at which the third metal sub-housing 3 is closest to the second metal sub-housing 2 in a process of being driven by the driving mechanism. And when the third metal sub-frame body 3 is in the second state, the third metal sub-frame body 3 is disconnected from the feed source 4, and is connected with the ground end to serve as a parasitic radiator of the communication terminal. This can be as shown in figure 2.
In this embodiment, the driving mechanism drives the third metal sub-frame 3 to be in the first state, or drives the third metal sub-frame 3 to be in the second state, where the third metal sub-frame 3 is a radiation main body of the communication terminal in the first state, and the third metal sub-frame 3 is a parasitic radiation body of the communication terminal in the second state. Therefore, the radiation performance requirements of the antenna under different states can be met.
In this embodiment, when the side edge or the bottom of the communication terminal uses the retractable structure, the feeding manner can be applied as well. When the position of the breakpoint of the metal middle frame is changed, the above feeding method can also be applied.
Optionally, the communication terminal further includes a feed source 4 and a controller, the feed source 4 is connected to the second metal sub-frame 2 through a first switch, the feed source is connected to the third metal sub-frame 3 through a second switch, and the controller controls the first switch and/or the second switch to be turned on or turned off.
In this embodiment, the controller may be a processor of the communication terminal, or may be a controller independent from the processor in the communication terminal. Of course, the preferred controller may be a processor of the communication terminal, so that the first switch and the second switch are controlled without adding an additional controller, thereby saving the cost of the communication terminal.
In this embodiment, the controller controls the first switch and/or the second switch to be turned on or off, so that the third metal sub-frame body 3 can be in the first state or the second state, which is convenient for meeting the performance requirements of antenna radiation in different states.
Optionally, a third switch is disposed between the second metal sub-frame 2 and the ground terminal, a fourth switch is disposed between the third metal sub-frame 3 and the ground terminal, and the controller controls on/off of the third switch and/or the fourth switch.
In this embodiment, the controller may be a processor of the communication terminal, or may be a controller independent from the processor in the communication terminal. Of course, the preferred controller may be a processor of the communication terminal, so that the third switch and the fourth switch are controlled without adding an additional controller, thereby saving the cost of the communication terminal.
In this embodiment, the controller controls the third switch and/or the fourth switch to be turned on or off, so that the third metal sub-frame body 3 can be in the first state or the second state, which is convenient for meeting the performance requirements of antenna radiation in different states.
Optionally, the branch where the first switch is located and the branch where the second switch is located are linked with the driving mechanism.
In this embodiment, the branch where the first switch is located, the branch where the second switch is located, and the driving mechanism are linked, so that the driving mechanism can perform different controls according to different requirements, and thus two paths of independent feeds can be achieved without affecting each other.
Optionally, when the third metal sub-frame body 3 is in the first state, the controller controls the first switch 5 to be turned off, and the second switch 6 to be turned on.
In this embodiment, when the third metal sub-frame 3 is in the first state, the controller may control the first switch 5 to be turned off, the second switch 6 to be turned on, the third switch 7 to be turned on, and the fourth switch 8 to be turned off.
For better understanding of the above process, please refer to fig. 3, and fig. 3 is a schematic structural diagram of a communication terminal according to an embodiment of the present invention. As shown in fig. 3, the controller controls the first switch 5 to be opened, the second switch 6 to be closed, the third switch 7 to be closed, and the fourth switch 8 to be opened.
In this way, the third metal sub-frame 3 becomes a monopole type antenna, and the third metal sub-frame 3 serves as a radiation main body, and since the third metal sub-frame is far from the main board, the clearance is sufficient, and good radiation performance can be ensured. In addition, the second metal sub-frame body 2 is integrally grounded, so that the overall performance of the communication terminal is not affected.
Optionally, when the third metal sub-frame body 3 is in the second state, the controller controls the first switch 5 to be turned on, the second switch 6 to be turned off, the third switch 7 to be turned off, and the fourth switch 8 to be turned on.
For better understanding of the above process, please refer to fig. 4, and fig. 4 is a schematic structural diagram of a communication terminal according to an embodiment of the present invention. As shown in fig. 4, the controller controls the first switch 5 to be closed, the second switch 6 to be open, the third switch 7 to be open, and the fourth switch 8 to be closed.
In this way, the second metal sub-housing 2 can radiate as an antenna. In addition, the third metal sub-frame body 3 is excited by the surface current of the second metal sub-frame body 2, and the third metal sub-frame body and the second metal sub-frame body 2 participate in radiation together as a parasitic path, so that the area of the frame is utilized to the maximum extent, and the problem of insufficient bandwidth of medium and low frequency can be relieved to a certain extent.
Optionally, the branch where the fourth switch is located is linked with the driving mechanism.
In this embodiment, the branch where the fourth switch is located is linked with the driving mechanism, and the branch where the third switch is located may also be linked with the driving mechanism. The driving mechanism can be controlled differently according to different requirements.
The communication terminal comprises a shell and a driving mechanism arranged in the shell, wherein the shell comprises a metal frame body, and the metal frame body comprises a first metal sub-frame body 1, a second metal sub-frame body 2 and a third metal sub-frame body 3; the first metal sub-frame body 1 and the second metal sub-frame body 2 are fixed to the shell, the first metal sub-frame body 1 and the second metal sub-frame body 2 are arranged separately, the third metal sub-frame body 3 is connected with the driving mechanism, and the driving mechanism drives the third metal sub-frame body 3 to be in a first state or drives the third metal sub-frame body 3 to be in a second state; the first state is a state that the third metal sub-frame body 3 is away from the second metal sub-frame body 2 by a first distance and is used as a radiation main body of the communication terminal; the second state is a state in which the three-metal sub-frame body 3 is separated from the second metal sub-frame body 2 by a second distance and coupled to the second metal sub-frame body, and is used as a parasitic radiator of the communication terminal; the first distance is greater than the second distance, and when the third metal sub-frame body 3 is in the first state, the second metal sub-frame body 2 is grounded. In this way, the driving mechanism can drive the third metal sub-frame 3 to be in the first state or the second state, so that the performance requirement of antenna radiation can be met.
Referring to fig. 5, fig. 5 is a flowchart of an antenna state control method provided in an embodiment of the present invention, and is applied to a communication terminal, and the antenna state control method includes a housing and a driving mechanism disposed in the housing, where the housing includes a metal frame, and the metal frame includes a first metal sub-frame, a second metal sub-frame, and a third metal sub-frame; as shown in fig. 5, the antenna state control method includes:
the first state is a state that the third metal sub-frame body is away from the second metal sub-frame body by a first distance and is used as a radiation main body of the communication terminal; the second state is a state in which the three-metal sub-frame body is separated from the second metal sub-frame body by a second distance and coupled with the second metal sub-frame body, and is used as a parasitic radiator of the communication terminal.
In this embodiment, the specific process of step 501 has been explained in detail in the foregoing embodiments, and is not repeated herein.
In this embodiment, the communication terminal may be a Mobile phone, a Tablet Personal Computer (Tablet Personal Computer), a Laptop Computer (Laptop Computer), a Personal Digital Assistant (PDA), a Mobile Internet Device (MID), a Wearable Device (Wearable Device), or the like.
The antenna state control method is applied to a communication terminal and comprises a shell and a driving mechanism arranged in the shell, wherein the shell comprises a metal frame body, and the metal frame body comprises a first metal sub-frame body, a second metal sub-frame body and a third metal sub-frame body; the first metal sub-frame body and the second metal sub-frame body are fixed on the shell, the first metal sub-frame body and the second metal sub-frame body are arranged separately, the third metal sub-frame body is connected with the driving mechanism, and the antenna state control method comprises the following steps: controlling the third metal sub-frame body to be in a first state, or controlling the third metal sub-frame body to be in a second state; the first state is a state that the third metal sub-frame body is away from the second metal sub-frame body by a first distance and is used as a radiation main body of the communication terminal; the second state is a state in which the three-metal sub-frame body is separated from the second metal sub-frame body by a second distance and coupled with the second metal sub-frame body, and is used as a parasitic radiator of the communication terminal. Therefore, the third metal sub-frame body can be controlled to be in the first state or the second state, and the performance requirement of antenna radiation can be met.
It should be noted that, in this document, 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 an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. The communication terminal is characterized by comprising a shell and a driving mechanism arranged in the shell, wherein the shell comprises a metal frame body, and the metal frame body comprises a first metal sub-frame body, a second metal sub-frame body and a third metal sub-frame body;
the first metal sub-frame body and the second metal sub-frame body are fixed on the shell, the first metal sub-frame body and the second metal sub-frame body are arranged separately, the third metal sub-frame body is connected with the driving mechanism, and the driving mechanism drives the third metal sub-frame body to be in a first state or drives the third metal sub-frame body to be in a second state;
the first state is a state that the third metal sub-frame body is away from the second metal sub-frame body by a first distance and is used as a radiation main body of the communication terminal;
the second state is a state that the three-metal sub-frame body is separated from the second metal sub-frame body by a second distance and coupled with the second metal sub-frame body and is used as a parasitic radiator of the communication terminal;
and when the third metal sub-frame body is in the first state, the second metal sub-frame body is grounded.
2. The communication terminal according to claim 1, further comprising a feed source and a controller, wherein the feed source is connected to the second metal sub-frame body through a first switch, the feed source is connected to the third metal sub-frame body through a second switch, and the controller controls the first switch and the second switch to be turned on or off.
3. The communication terminal according to claim 2, wherein a third switch is disposed between the second metal sub-frame and a ground terminal, a fourth switch is disposed between the third metal sub-frame and the ground terminal, and the controller controls the third switch and the fourth switch to be turned on or off.
4. The communication terminal according to claim 3, wherein the branch of the first switch and the branch of the second switch are linked with the driving mechanism.
5. The communication terminal according to claim 4, wherein the controller controls the first switch to be open and the second switch to be closed when the third metal subframe is in the first state.
6. The communication terminal of claim 4, wherein the controller controls the first switch to be closed, the second switch to be open, the third switch to be open, and the fourth switch to be closed when the third metal subframe is in the second state.
7. The communication terminal according to claim 4, wherein the branch of the fourth switch is linked with the driving mechanism.
8. An antenna state control method is applied to a communication terminal and comprises a shell and a driving mechanism arranged in the shell, wherein the shell comprises a metal frame body, and the metal frame body comprises a first metal sub-frame body, a second metal sub-frame body and a third metal sub-frame body; the first metal sub-frame body and the second metal sub-frame body are fixed on the shell, the first metal sub-frame body and the second metal sub-frame body are arranged separately, and the third metal sub-frame body is connected with the driving mechanism, and the antenna state control method is characterized by comprising the following steps:
controlling the third metal sub-frame body to be in a first state, or controlling the third metal sub-frame body to be in a second state;
the first state is a state that the third metal sub-frame body is away from the second metal sub-frame body by a first distance and is used as a radiation main body of the communication terminal; the second state is a state in which the three-metal sub-frame body is separated from the second metal sub-frame body by a second distance and coupled with the second metal sub-frame body, and is used as a parasitic radiator of the communication terminal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811493831.1A CN109659671B (en) | 2018-12-07 | 2018-12-07 | Communication terminal and antenna state control method |
| PCT/CN2019/116597 WO2020114194A1 (en) | 2018-12-07 | 2019-11-08 | Communication terminal and antenna state control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811493831.1A CN109659671B (en) | 2018-12-07 | 2018-12-07 | Communication terminal and antenna state control method |
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| CN109659671A CN109659671A (en) | 2019-04-19 |
| CN109659671B true CN109659671B (en) | 2020-08-28 |
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| WO (1) | WO2020114194A1 (en) |
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| CN109659671B (en) * | 2018-12-07 | 2020-08-28 | 维沃移动通信有限公司 | Communication terminal and antenna state control method |
| CN112018519B (en) * | 2020-08-31 | 2022-03-15 | 维沃移动通信有限公司 | Antenna structure and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5904459A (en) * | 1997-06-03 | 1999-05-18 | Motorola Inc. | Fastener apparatus and system with self-setting torque and over-torque protection |
| SE528569C2 (en) * | 2004-09-13 | 2006-12-19 | Amc Centurion Ab | Antenna device and portable radio communication device including such antenna device |
| US7460076B2 (en) * | 2006-06-13 | 2008-12-02 | Sony Ericsson Mobile Communications Ab | Mobile wireless communications terminals and wireless communications cards for use with an electronic device |
| US20120162040A1 (en) * | 2009-03-23 | 2012-06-28 | Toru Taura | Mobile wireless terminal |
| CN104659484B (en) * | 2015-02-03 | 2018-06-19 | 小米科技有限责任公司 | Detachable antenna equipment, the method and device of control antenna equipment rotation |
| CN105572506B (en) * | 2016-01-04 | 2018-11-23 | 广州市诚臻电子科技有限公司 | A kind of nonmetallic position sensor, antenna automatic positioning equipment and system for electromagnetic compatibility test |
| CN109659671B (en) * | 2018-12-07 | 2020-08-28 | 维沃移动通信有限公司 | Communication terminal and antenna state control method |
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| CN109659671A (en) | 2019-04-19 |
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