CN109256609A - Has the contactless frequency automatic adjusting and testing filter of anti-leak chamber - Google Patents
Has the contactless frequency automatic adjusting and testing filter of anti-leak chamber Download PDFInfo
- Publication number
- CN109256609A CN109256609A CN201710568168.6A CN201710568168A CN109256609A CN 109256609 A CN109256609 A CN 109256609A CN 201710568168 A CN201710568168 A CN 201710568168A CN 109256609 A CN109256609 A CN 109256609A
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- China
- Prior art keywords
- movable part
- cavity
- shell
- opening
- automatic adjusting
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/207—Hollow waveguide filters
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/207—Hollow waveguide filters
- H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
Abstract
The present invention provides a kind of contactless frequency automatic adjusting and testing filter for having anti-leak chamber, it includes first cavity with the first opening in first shell and the first shell, movable part and the second cavity, and second cavity has second shell, first chamber in the second shell, and penetrate through the second opening and third opening of the second shell, the movable part is open to be inserted into first cavity or be open from the third from the third and be inserted between third opening and first cavity, the neighbouring movable part of second opening and a part for constituting the chamber, and the second shell has compartment at the neighbouring movable part to separate the movable part and the chamber, and the first shell and the second shell are not contacted with the movable part.The present invention can solve centre frequency and when Bandwidth adjustment electromagnetism that leaks involves the unstable problem of frequency shifting.
Description
Technical field
The present invention relates to a kind of technical fields of automatic mode filter, more specifically, being a kind of by mobile activity
Part and the contactless frequency automatic adjusting and testing filter for changing the tool anti-leak chamber of filter centre frequency and bandwidth.
Background technique
It only include first had in first shell and the first shell in traditional frequency automatic adjusting and testing filter
The first cavity and movable part of opening, the movable part are inserted into first opening.And between the movable part and the first shell
It in the case where being in contact with each other, will cause to generate friction between the movable part and the first shell, so that filter center frequency occur
Rate generates wild effect in migration process.And if each other because of phase caused by rubbing between the movable part and the first shell
To position disturbance, local deformation and/or gap, and or machining accuracy it is bad caused by discontiguous situation under, the first cavity
Electromagnetic wave will be largely dissipated to except traditional frequency automatic adjusting and testing filter from the gap, to seriously harm electromagnetic wave just
Really transmission.
Summary of the invention
The present invention provides a kind of contactless frequency automatic adjusting and testing filter for having anti-leak chamber comprising has first
The first cavity, the first movable part and the second cavity of the first opening on shell and the first shell, and second cavity has
There are second shell, the first chamber in the second shell and the second opening and third opening that penetrate through the second shell, this
One movable part from the third be open be inserted into first cavity or from the third be open be inserted into the third opening with first cavity it
Between, and the neighbouring part for being inserted into first movable part of the second shell is adapted to the shape of first movable part, second opening is adjacent
Nearly first movable part and a part for constituting the first chamber, and between the second shell has at neighbouring first movable part
Every part to separate first movable part and the first chamber, and the first shell and the second shell and first movable part are not
Contact.
The contactless frequency automatic adjusting and testing filter of tool anti-leak chamber of the invention further includes driving unit to adjust
The insertion depth of first movable part.
The contactless frequency automatic adjusting and testing filter of tool anti-leak chamber of the invention, wherein first cavity and should
The number of first movable part is that plural and those the first cavitys at least the two communicates.
The contactless frequency automatic adjusting and testing filter of tool anti-leak chamber of the invention further includes moving part, and connection is matched
Belong to respectively first movable part of different first cavitys, to coordinate the insertion depth of respectively first movable part.
The contactless frequency automatic adjusting and testing filter of tool anti-leak chamber of the invention, wherein attach different this
It is not communicated between respectively second cavity of one cavity.
The contactless frequency automatic adjusting and testing filter of tool anti-leak chamber of the invention further includes the second movable part and
Five openings, those the first cavitys both at least its communicated with the first cavity lane, first movable part and second movable part
Sum and third opening with the 5th opening sum to be equal a plurality of, and second movable part and the 5th be open it
Corresponding first cavity lane, so that second movable part is inserted into first cavity lane from the 5th opening or opens from the 5th
Between the 5th opening of mouth insertion and first cavity lane.
The contactless frequency automatic adjusting and testing filter of tool anti-leak chamber of the invention, wherein the first shell has
Opposite first part and second part, it is arranged at the first part second cavity, and further includes third movable part, should
It is more provided at second part with the second chamber in third shell, the third shell and penetrates through the of the third shell
It corresponds to first cavity lane for the third cavity of six openings, the third movable part and the 6th opening, for the third activity
Part is inserted into first cavity lane from the 6th opening or is open and first cavity lane from the 6th opening insertion the 6th
Between.
The contactless frequency automatic adjusting and testing filter of tool anti-leak chamber of the invention, wherein the tool anti-leak chamber
Contactless frequency automatic adjusting and testing filter its by first cavity reach filter from different movable parts for going deep into depth
The automatic tuning of wave device centre frequency or bandwidth.
Compared to known technology, the present invention proposes a structure with anti-leak chamber, and allows movable part and filter sheet
A spacing is generated between body, and then stablizes the movement of movable part, but can't cause a large amount of leakage of information.
Detailed description of the invention
Fig. 1 is the cut-away view of the contactless frequency automatic adjusting and testing filter of tool anti-leak chamber of the invention；
Fig. 2 is the partial enlarged view of Fig. 1；
Fig. 3 A and Fig. 3 B are respectively the contactless frequency of the tool anti-leak chamber of one embodiment of the invention and another embodiment
The explosive view of rate automatic adjusting and testing filter；
Fig. 4 A and Fig. 4 B are respectively the contactless frequency automatic adjusting and testing of the tool anti-leak chamber of further embodiment of this invention
The internal cross section schematic diagram and explosive view of filter；
Fig. 5 is the contactless frequency automatic adjusting and testing filter of the tool anti-leak chamber of one embodiment of the invention in transmission electricity
The effect of electromagnetism leaked wave is prevented when magnetic wave schematic diagram.
Symbol description:
The contactless frequency automatic adjusting and testing filter of 1 tool anti-leak chamber
10 first cavitys
10a first part
10b second part
101 first shells
102 first openings
103 resonant cavities
104 first cavity lanes
20 first movable parts
20 ' second movable parts
20 ' ' third movable part
201 side surfaces
30 second cavitys
30 ' third cavitys
301 second shells
301 ' third shells
302 first chambers
302 ' second chambers
303 second openings
303 ' the 4th openings
304 thirds opening
304 ' the 5th openings
304 ' ' the 6th opening
306 compartments
308 lids
309 flanges
40 moving parts
50 input terminals
60 output ends
2 leak electromagnetic wave
C, C' direction of insertion
The path F
V normal
The first spacing of P1
The second spacing of P2
Specific embodiment:
To fully understand the purpose of the present invention, feature and effect, hereby by following specific embodiments, and cooperate institute's attached drawing
Formula is described in detail the present invention, illustrates as after:
Please referring to Fig. 1, Fig. 2, Fig. 3 A and Fig. 3 B, Fig. 1 is the contactless of the tool anti-leak chamber of one embodiment of the invention
The cut-away view of frequency automatic adjusting and testing filter, and Fig. 2 is the partial enlarged view of Fig. 1, another Fig. 3 A and Fig. 3 B are respectively the present invention one
The explosive view of the contactless frequency automatic adjusting and testing filter of the tool anti-leak chamber of embodiment and another embodiment.In Fig. 1,
The contactless frequency automatic adjusting and testing filter 1 of tool anti-leak chamber of the invention includes the first cavity 10, the first movable part 20
And second cavity 30.
Single first cavity 10 as described above can have the first opening in first shell 101 and first shell 101
102.First opening 102 can at least run through a part of first shell 101, to form resonant cavity in the insertion of the first movable part 20
103, to enable the electromagnetic wave of transmission not dissipate, so as to electromagnetic transmission.And in 20 number of the first cavity 10 and the first movable part
In the case where plural number, at least the two of those the first cavitys 10 can be communicated, i.e., as shown in Fig. 1 to Fig. 3 A and Fig. 3 B, two is adjacent
There is the first cavity lane 104, so that electromagnetic wave is transmitted along a series of first cavitys 10 between first cavity 10.It is more specific and
Speech, as shown in Fig. 3 A and Fig. 3 B, electromagnetic wave can enter a series of first cavitys 10 by input terminal 50 and the first cavity lane 104 passes
Transport to output end 60.
Single second cavity 30 as described above can be associated with single first cavity 10, and be multiple in 10 number of the first cavity
In the case where number, the number of the second cavity 30 can be equal to the number of the first cavity 10, and be associated with the first different cavitys 10
It can be not communicated between each second cavity 30.In the case where being associated with single first cavity 10 is single second cavity 30, second
Cavity 30 can have the second of second shell 301, the first chamber 302 in second shell 301 and perforation second shell 301
Opening 303 and third opening 304, third opening 304 can correspond to the first opening 102 so that the first movable part 20 is open from third
304 the first cavitys 10 (person between as shown in figure 1) of insertion are inserted between third opening 304 and the first cavity 10 from third opening 304,
And the part of the first movable part 20 of neighbouring insertion of second shell 301 is adapted to the shape of the first movable part 20.For example, such as Fig. 2
Shown, the extended line and the first movable part 20 of the normal V of the second opening 303 are inserted into the road of the first opening 102 from third opening 304
Between the extended line of diameter F can at an acute angle or right angle, be adapted to 20 shape of the first movable part be irregular situation, particularly,
It can be rectangular between the extended line of normal V and the side surface 201 of the first movable part 20 of second opening 303.And the second opening 303
Can be adjacent to the first movable part 20 and a part of composition first chamber 302, and second shell 301 is at neighbouring first movable part 20
With compartment 306 to separate the first movable part 20 and first chamber 302.Via this design of the present invention, the first movable part
20 when moving, and the electromagnetic wave of the first cavity 10 can be open between 304 without the first movable part 20 and third because of the first movable part
20 mobile be may cause gaps and be largely dissipated to tool anti-leak chamber contactless frequency automatic adjusting and testing filter 1 it
Outside, but conduction is to the second cavity 30 in a small amount through the second opening 303, to farthest keep the correct transmission of electromagnetic wave.
Alternatively, as shown in the left and right ends Fig. 3 B, those the first cavitys 10 both at least its with 104 phase of the first cavity lane
It is logical, and the contactless frequency automatic adjusting and testing filter 1 of tool anti-leak chamber of the invention can further include the second movable part 20 ' and
5th opening 304 ', the first movable part 20 and 20 ' sum of the second movable part can be open with third 304 with the 5th be open 304 ' it is total
Number be it is equal a plurality of, and the second movable part 20 ' and the 5th opening 304 ' its correspond to first cavity lanes 104, for second
Movable part 20 ' along Fig. 3 B direction of insertion C and from the 5th opening 304 ' insertion the first cavity lanes 104 or from the 5th opening 304 '
It is inserted between the 5th opening 304 ' and the first cavity lane 104.
It is worth noting that, as shown in the left and right ends Fig. 3 B from the 5th opening 304 ' insertion the first cavity lanes 104 or
It also may be designed as from the second movable part 20 ' between the 5th opening 304 ' of 304 ' insertion of the 5th opening and the first cavity lane 104
Corresponding to the first cavity lane of centre 104 or other first cavity lane 104 of a series of first cavity channels 104, without
Only correspond to a series of the first cavity lane of left and right ends edge 104 of first cavity channels 104 for design.
Second cavity 30 can have stepped flange 309 far from the second shell 301 at the first cavity 10, for having
Lid 308 and the second shell 301 of third opening 304 in conjunction with and jointly as second shell 301.However in the 3D printing system of use
In the case where making, second shell 301 can be one of the forming.And the shape of lid 308 can for round, ellipse, polygon or its
Combination.
It can not be contacted between the second shell 301 and the first movable part 20 of (as shown in Figure 2) of the invention, to avoid first
When movable part 20 is mobile, because of second shell 301 and the first work caused by the friction between second shell 301 and the first movable part 20
Filter centre frequency produces in migration process caused by relative position disturbance, local deformation and/or gap between moving part 20
Raw wild effect.Particularly, second shell 301 has between the first movable part 20 of insertion at third opening 304
There is the first spacing P1.
For similar, there is the second spacing between the compartment 306 of second shell 301 and the first movable part 20 of insertion
P2, wherein the first above-mentioned spacing P1 can be equal to the second spacing P2, and compartment 306 can also illustrate the first movable part 20
It maintains to stablize when moving, to avoid generating wild effect as described above when the first movable part 20 is mobile.Although second
Have between shell 301 and the first movable part 20 of insertion and electromagnetic wave is caused largely to be dissipated to the contactless of tool anti-leak chamber
Spacing except frequency automatic adjusting and testing filter 1, however, since the present invention uses the electromagnetic wave that will be leaked in a small amount through the second opening
303 import the design of first chamber 302 and use discontiguous design between second shell 301 and the first movable part 20, thus
Filter centre frequency generates in migration process caused by avoiding because of the friction between second shell 301 and the first movable part 20
Wild effect, and can not make electromagnetic wave be largely dissipated to tool anti-leak chamber contactless frequency automatic adjusting and testing filter
Except 1, farthest to keep the correct transmission of electromagnetic wave.
It is worth noting that, the second cavity 30 at corresponding first cavity lane 104 also may include similar first movable part
Second opening 303 of the second cavity 30 of 20 insert divisions and the structure of compartment 306, i.e., the 4th opening 303 ' and the corresponding 4th
The compartment 306 of opening 303 '.
Similarly, first shell 101 can not also be contacted with the first movable part 20, to avoid because of first shell 101 and
The wild effect that filter centre frequency caused by friction between one movable part 20 generates in migration process.
The contactless frequency automatic adjusting and testing filter 1 of tool anti-leak chamber of the invention can further include driving unit to adjust
The insertion depth of whole first movable part 20 reaches frequency shift (FS) to cause frequency disturbance.Driving unit can be with linear activity group
Part and control panel collocation running, so that the first movable part 20 for example be enabled to move up and down with respect to the first cavity 10.In addition, this hair
The contactless frequency automatic adjusting and testing filter 1 of bright tool anti-leak chamber can also further include connection and attach the first different cavitys
The moving part 40 of 10 each first movable part 20, to coordinate the insertion depth of each first movable part 20.
As shown in fig. 4 a and fig. 4b, be respectively further embodiment of this invention tool anti-leak chamber contactless frequency
The internal cross section schematic diagram and explosive view of automatic adjusting and testing filter.In this embodiment, first shell 101 has opposite first
Part 10a and second part 10b.In the case where first shell 101 is round or oval, first part 10a and second
Divide 10b that can be round or oval two parts being relatively distant from shell, and in the case where first shell 101 is polyhedral situation,
First part 10a and second part 10b can be the two side faces being relatively distant from.It is arranged at first part 10a second cavity 30,
And the contactless frequency automatic adjusting and testing filter 1 for having anti-leak chamber further includes third movable part 20 ", at second part 10b
It is more provided with the second chamber 302 ' in third shell 301 ', third shell 301 ' and penetrates through third shell 301 '
The third cavity 30 ' of 6th opening 304 ", third movable part 20 " and the 6th opening 304 " can correspond to the first cavity lane 104, with
For third movable part 20 " along direction of insertion C ' from the 6th opening 304 " insertion the first cavity lanes 104 or from the 6th opening 304 "
It is inserted between the 6th opening 304 " and the first cavity lane 104.It is worth noting that, third cavity 30 ' also may include similar the
The 4th opening 303 ', compartment 306, lid 308 and/or the flange 309 of two cavitys 30, and third movable part 20 " and first
It can not be contacted between shell 101 and/or third shell 301 ', and third shell 301 ' can be wholely set with first shell 101, or
Person's third shell 301 ' can be with 101 discrete combined of first shell.
In addition, first can be divided into third movable part to third movable part jointly with same moving part 40 or first
Using different moving parts, and or the present invention above combination can be used.Furthermore third movable part 20 ", which can be not only located at, to be corresponded to
A series of the first cavity lane of centre 104 of first cavity channels 104, third movable part 20 " also can correspond to a series of first
The first cavity lane of left and right ends edge 104 of cavity channel 104.
As shown in figure 5, its contactless frequency automatic adjusting and testing filtering for the tool anti-leak chamber of one embodiment of the invention
The effect of device prevents electromagnetism leaked wave when transmitting electromagnetic wave schematic diagram.In electromagnetic transmission to the first movable part 20 insertion first
When cavity 10, since the present invention makes the electromagnetic wave 2 that leaks leaked from the first cavity 10 can be without first using the second cavity 30
Tool is largely dissipated to because of the be may cause spacing of the first movable part 20 movement between movable part 20 and third opening 304 to prevent letting out
Leak except the contactless frequency automatic adjusting and testing filter 1 of chamber that (i.e. the electromagnetic wave 2 that prevents from leaking expressed by X symbol in Fig. 5 is logical
The meaning crossed), but conduction is to the second cavity 30 in a small amount through the second opening 303, to farthest keep the correct of electromagnetic wave
Transmission.
In conclusion the present invention by by the electromagnetic wave to leak in a small amount through the second cavity second opening import chamber and with
Movable part and the discontiguous design of second shell, can be such that the contactless frequency automatic adjusting and testing of tool anti-leak chamber of the invention filters
Wave device has simultaneously avoids a lot of leakage electromagnetism from involving wild effect that filter centre frequency generates in migration process
The effect of problem.
The present invention is hereinbefore disclosed with preferred embodiment, and being so familiar with the technology person should be understood that the embodiment
It is only used for describing the present invention, and is not construed as limiting the scope of the invention.It should be noted that such as equivalent with the embodiment
Variation and displacement, should all be set as being covered by scope of the invention.Therefore, protection scope of the present invention is when with scope of the claims
Subject to institute's defender.
Claims (8)
1. a kind of contactless frequency automatic adjusting and testing filter for having anti-leak chamber characterized by comprising
First cavity, with the first opening in first shell and the first shell；
First movable part；And
Second cavity, with second shell, the first chamber in the second shell and the second opening for penetrating through the second shell
And third opening, which, which is open to be inserted into first cavity or be open from the third from the third, is inserted into third opening
Between first cavity, and the neighbouring part for being inserted into first movable part of the second shell is adapted to the shape of first movable part
Shape, this second is open and neighbouring first movable part and constitutes some of the first chamber, and the second shell in it is neighbouring this
Have compartment to separate first movable part and the first chamber, and the first shell and the second shell at one movable part
It is not contacted with first movable part.
2. the contactless frequency automatic adjusting and testing filter of tool anti-leak chamber as described in claim 1, which is characterized in that more
The insertion depth of first movable part is adjusted including driving unit.
3. the contactless frequency automatic adjusting and testing filter of tool anti-leak chamber as described in claim 1, which is characterized in that its
In, the number of first cavity and first movable part is that plural and those the first cavitys at least the two communicates.
4. the contactless frequency automatic adjusting and testing filter of tool anti-leak chamber as claimed in claim 3, which is characterized in that more
Including moving part, respectively first movable part of different first cavitys is attached in connection, to coordinate each first movable part
Insertion depth.
5. the contactless frequency automatic adjusting and testing filter of tool anti-leak chamber as claimed in claim 3, which is characterized in that its
In, attach and is not communicated between respectively second cavity of different first cavitys.
6. the contactless frequency automatic adjusting and testing filter of tool anti-leak chamber as claimed in claim 3, which is characterized in that more
Be open including the second movable part and the 5th, those the first cavitys both at least its communicated with the first cavity lane, this is first living
The sum of moving part and second movable part its with third opening with the sum of the 5th opening to be equal a plurality of, and this
It corresponds to first cavity lane for two movable parts and the 5th opening, for second movable part from the 5th opening insertion this
One cavity lane is open between first cavity lane from the 5th opening insertion the 5th.
7. the contactless frequency automatic adjusting and testing filter of tool anti-leak chamber as claimed in claim 3, which is characterized in that its
In, which has opposite first part and second part, and second cavity setting is wrapped at the first part, and more
Movable part containing third is more provided at the second part with the second chamber and perforation in third shell, the third shell
It corresponds to first cavity lane for the third cavity of 6th opening of the third shell, the third movable part and the 6th opening,
For the third movable part from the 6th opening be inserted into first cavity lane or from the 6th opening insertion the 6th opening with
Between first cavity lane.
8. the contactless frequency automatic adjusting and testing filter of tool anti-leak chamber as described in claim 1, which is characterized in that its
In, the contactless frequency automatic adjusting and testing filter of the tool anti-leak chamber its by first cavity and different depth of going deep into
First movable part and the automatic tuning for reaching filter centre frequency or bandwidth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710568168.6A CN109256609B (en) | 2017-07-13 | 2017-07-13 | Non-contact type frequency automatic adjusting and detecting filter with leakage-proof cavity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710568168.6A CN109256609B (en) | 2017-07-13 | 2017-07-13 | Non-contact type frequency automatic adjusting and detecting filter with leakage-proof cavity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109256609A true CN109256609A (en) | 2019-01-22 |
| CN109256609B CN109256609B (en) | 2020-04-03 |
Family
ID=65051672
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710568168.6A Expired - Fee Related CN109256609B (en) | 2017-07-13 | 2017-07-13 | Non-contact type frequency automatic adjusting and detecting filter with leakage-proof cavity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109256609B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201749918U (en) * | 2010-05-31 | 2011-02-16 | 深圳市大富科技股份有限公司 | Cavity filter and filter cavity |
| CN202050042U (en) * | 2011-01-27 | 2011-11-23 | 中兴通讯股份有限公司 | Filter |
| CN204905394U (en) * | 2015-09-01 | 2015-12-23 | 昇达科技股份有限公司 | Wave filter with adjustable |
| CN105489989A (en) * | 2015-12-24 | 2016-04-13 | 中国电子科技集团公司第五十四研究所 | High-power waveguide electrically tunable filter |
| CN106469842A (en) * | 2015-09-01 | 2017-03-01 | 昇达科技股份有限公司 | Adjustable frequency and the wave filter of frequency range |
| CN206148592U (en) * | 2016-09-02 | 2017-05-03 | 摩比天线技术（深圳）有限公司 | Prevent cavity filter that signal revealed |
-
2017
- 2017-07-13 CN CN201710568168.6A patent/CN109256609B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201749918U (en) * | 2010-05-31 | 2011-02-16 | 深圳市大富科技股份有限公司 | Cavity filter and filter cavity |
| CN202050042U (en) * | 2011-01-27 | 2011-11-23 | 中兴通讯股份有限公司 | Filter |
| CN204905394U (en) * | 2015-09-01 | 2015-12-23 | 昇达科技股份有限公司 | Wave filter with adjustable |
| CN106469842A (en) * | 2015-09-01 | 2017-03-01 | 昇达科技股份有限公司 | Adjustable frequency and the wave filter of frequency range |
| CN105489989A (en) * | 2015-12-24 | 2016-04-13 | 中国电子科技集团公司第五十四研究所 | High-power waveguide electrically tunable filter |
| CN206148592U (en) * | 2016-09-02 | 2017-05-03 | 摩比天线技术（深圳）有限公司 | Prevent cavity filter that signal revealed |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109256609B (en) | 2020-04-03 |
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