CN216133188U - Electric wave penetration cover - Google Patents
Electric wave penetration cover Download PDFInfo
- Publication number
- CN216133188U CN216133188U CN202090000447.8U CN202090000447U CN216133188U CN 216133188 U CN216133188 U CN 216133188U CN 202090000447 U CN202090000447 U CN 202090000447U CN 216133188 U CN216133188 U CN 216133188U
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- Prior art keywords
- radio wave
- thin film
- conductive thin
- regions
- resonance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/93—Radar or analogous systems specially adapted for specific applications for anti-collision purposes
- G01S13/931—Radar or analogous systems specially adapted for specific applications for anti-collision purposes of land vehicles
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/03—Details of HF subsystems specially adapted therefor, e.g. common to transmitter and receiver
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Radar Systems Or Details Thereof (AREA)
- Details Of Aerials (AREA)
Abstract
The radio wave transmission cover has a cover base material made of resin and provided on a path of a radio wave transmitted and received by the device, and a conductive thin film provided on a surface of the cover base material and generating heat by energization. The conductive thin film has a plurality of opening regions each formed by an annular hole, and a plurality of resonance regions each insulated by being surrounded by each opening region. The open regions and the resonance regions are provided at intervals from each other so as to be regularly arranged with respect to the conductive thin film. The size of each resonance region is set to a size such that when the radio wave is input to the resonance region, a radio wave having a wavelength equal to that of the radio wave is output. The interval between the open regions is set to an interval that satisfies the heat generation performance required for the conductive thin film.
Description
Technical Field
The present invention relates to a radio wave transmission cover.
Background
A vehicle such as an automobile is equipped with a device for transmitting and receiving radio waves such as a radio wave radar. The radio wave radar is used for transmitting electric waves such as millimeter waves toward the outside of the vehicle, receiving the electric waves (reflected waves) reflected by an object that touches the outside of the vehicle, and detecting the object outside the vehicle by transmitting and receiving the electric waves as described above. Further, a radio wave penetration cover for preventing the radio wave radar from being directly viewed from the outside of the vehicle is provided on the front side (vehicle outside) in the transmission direction of the radio wave radar. The radio wave transmitting cover is located on a path of a radio wave transmitted and received by the radio wave radar.
Patent document 1 discloses a radio wave transmitting cover having a finely extended conductor. In the radio wave transmission cover, the conductor is heated by applying current to the conductor, and thus the ice and snow adhering to the radio wave transmission cover melt. Incidentally, in patent document 1, the conductor is disposed so as to extend back and forth. In this conductor, a predetermined interval is provided between portions extending in parallel. Further, if the ice and snow adhering to the radio wave transmission cover are melted as described above, the deterioration of the detection performance of the radio wave radar due to the attenuation of the radio wave caused by the adhesion of the ice and snow is suppressed.
Patent document 1: japanese laid-open patent publication No. 4-150302
Disclosure of Invention
However, in the radio wave transmitting cover, the radio wave is cut off by the electric conductor. Therefore, by spacing the parallel portions of the conductor at a predetermined interval, the radio wave can penetrate the gap between the parallel portions. However, it is not clear how much the electric conductor arranged as described above affects the transmission performance of the radio wave through the radio wave shield. Therefore, the radio wave transmission performance required for the radio wave transmission cover may not be obtained.
In addition, it is also conceivable to increase the gap between the parallel portions in the conductor for the purpose of improving the radio wave transmission performance of the radio wave transmission cover. However, in this case, the amount of the electric conductor is reduced, and therefore, there is a possibility that the heat generation performance of the electric conductor for melting the ice and snow adhering to the radio wave transmission cover is insufficient.
The purpose of the present invention is to provide a radio wave transmission cover that can achieve both the suppression of the lack of heat generation performance and the securing of the required radio wave transmission performance.
Means for solving the above problems and the effects thereof will be described below.
The radio wave transmission cover includes a cover base made of resin and provided on a path of a radio wave transmitted and received by a device, and a conductive thin film provided on a surface of the cover base and generating heat by energization. The conductive thin film has a plurality of opening regions each formed by an annular hole and a plurality of resonance regions each insulated by being surrounded by the opening regions. The open regions and the resonance regions are provided at intervals so as to be regularly arranged with respect to the conductive thin film. The size of each resonance region is set to a size that outputs a radio wave having a wavelength equal to that of the radio wave when the radio wave is incident on the resonance region. The interval between the opening regions is set to satisfy the heat generation performance required by the conductive thin film. The distance is preferably a distance at which a grating lobe does not occur.
According to the above configuration, the conductive thin film is provided on the surface of the cover base material of the radio wave transmission cover, and the portion other than the opening region and the resonance region of the conductive thin film is a portion that generates heat by energization. The heat generation of the portion satisfies the heat generation performance required for the conductive thin film. Further, if a radio wave is incident on the resonance region of the conductive thin film, a radio wave having a wavelength equal to that of the radio wave is output from the resonance region. Therefore, the radio wave is in the same state as the state after passing through the resonance region, and thus the required radio wave transmission performance is also ensured. As described above, both suppression of the shortage of the heat generation performance of the radio wave transmission cover and securing of the required radio wave transmission performance can be achieved.
In the radio wave transmitting cover, it is preferable that the resonance regions are arranged so as to form a square having a side length a and have a distance p between centers of adjacent resonance regions, the opening regions are formed so as to have a width w around a corresponding one of the resonance regions, the size of each resonance region is set to a size that outputs a radio wave having a wavelength equal to the radio wave when the radio wave is incident on the resonance region, and the interval between the opening regions is set to an interval that satisfies a heat generation performance required for the conductive thin film, and the following expression "(a +2w) < p is satisfied with respect to a wavelength λ of the radio wave incident on the resonance region
And < (λ/2) < (λ + a +2w) "is achieved by determining the length a, the distance p, and the width w.
According to the above configuration, the resonance region and the opening region are square, and therefore they are easily arranged regularly with respect to the conductive thin film. Further, by determining the length a, the distance p, and the width w so as to satisfy the above expression, it is possible to suppress the lack of the heat generation performance of the radio wave transparent cover, and to suppress the generation of grating lobes, thereby ensuring the required radio wave transparent performance.
In the radio wave-transparent cover, it is preferable that each of the opening regions is disposed to have a distance 2d between adjacent opening regions, and the length a, the distance p, the width w, and the distance 2d are determined so as to satisfy the following expressions "p ═ a +2w +2 d" and "2 d ═ a +2 w".
If the distance 2d is set to "2 d < a +2 w", the resistance value of the conductive thin film becomes large, and it becomes difficult for current to flow, and there is a possibility that the power generation performance required of the conductive thin film cannot be satisfied. Further, if the distance 2d is set to "2 d > a +2 w", the resistance value of the conductive thin film decreases, and therefore, the conductive thin film may not sufficiently generate heat due to the value of the current flowing through the conductive thin film, and the power generation performance required of the conductive thin film may not be satisfied. According to the above configuration, the distance 2d is determined so as to satisfy the expressions "p + a +2w +2 d" and "2 d + a +2 w", and therefore, it is possible to suppress the failure to satisfy the power generation performance required for the conductive thin film as described above. As a result, the heat generation performance of the conductive thin film when the conductive thin film is energized can be made to be the performance required for the conductive thin film.
In the radio wave transmitting cover, it is preferable that the cover base is provided on a path of a radio wave transmitted and received by a radio wave radar mounted on a vehicle, and the conductive thin film is provided on a surface of the cover base on the vehicle exterior side and is formed to be transparent.
According to this configuration, the ice and snow adhering to the radio wave transmission cover can be efficiently melted by heat generated by the conductive thin film provided on the surface of the cover base material on the vehicle exterior side. Further, since the conductive thin film is formed to be transparent, when decoration is applied to the cover base material so as to be visible from the vehicle exterior side, the decoration can be prevented from being hidden by the conductive thin film.
Drawings
Fig. 1 is a cross-sectional view showing a radio wave radar and a radio wave-transmitting cover mounted on a vehicle.
Fig. 2 is a front view of the conductive thin film as viewed from the left side of fig. 1.
Detailed Description
Next, a radio wave transmission cover 2 according to an embodiment will be described with reference to fig. 1 and 2.
Fig. 1 schematically shows a radio wave radar 1 and a radio wave-transparent cover 2 mounted on a vehicle. The radio wave radar 1 transmits radio waves such as millimeter waves toward the outside of the vehicle (left side in fig. 1), receives the radio waves (reflected waves) reflected by an object that touches the outside of the vehicle, and detects the object outside the vehicle by transmitting and receiving the radio waves as described above. The radio wave transparent cover 2 is located on the front side (vehicle outside) in the radio wave transmission direction of the radio wave radar 1, and is provided so that the radio wave radar 1 cannot be directly viewed from the outside of the vehicle. The radio wave transmission cover 2 is located on a path of a radio wave transmitted and received by the radio wave radar 1.
The cover base material 3 of the radio wave transmission cover 2 has a base layer 4 formed of ASA (Acrylate styrene Acrylonitrile) resin. A convex portion 5 is formed on the surface (left surface in fig. 1) of the base layer 4 opposite to the radio wave radar 1. A design layer 6 is formed at the tip in the projecting direction of the projection 5. The design layer 6 is formed of a metal having radio wave permeability. In this way, decoration is applied to the surface of the base layer 4 on which the convex portions 5 are provided by the design layer 6. The cover substrate 3 further includes a transparent layer 7 covering the surface of the base layer 4 on which the convex portions 5 are provided. The transparent layer 7 is formed of a transparent resin, i.e., polycarbonate.
A conductive thin film 8 that generates heat by energization is provided on the vehicle exterior surface (left surface in fig. 1) of the cover base 3. The conductive thin film 8 is formed of a conductor such as silver (Ag) so as to be transparent. The surface of the conductive film 8 on the vehicle outer side is covered with a protective layer 9 made of polycarbonate. The cover base material 3 formed as described above is also positioned on the path of the radio wave transmitted and received by the radio wave radar 1.
Next, the conductive thin film 8 will be described in detail.
Fig. 2 shows a state in which the conductive thin film 8 is viewed from the left side of fig. 1. As is apparent from fig. 2, the conductive thin film 8 has a plurality of opening regions 10 each formed by an annular hole 12 and a plurality of resonance regions 11 each insulated by being surrounded by each opening region 10. These open regions 10 and resonance regions 11 are provided at intervals so as to be regularly arranged with respect to the conductive thin film 8. The interval is set to an interval in which so-called grating lobes do not occur. Each resonance region 11 is formed in a square shape having a side length a, and is disposed with a distance p between centers of adjacent resonance regions 11. Each of the opening regions 10 is formed to have a width w around a corresponding one of the resonance regions 11, and is square like the resonance region 11.
The size of each resonance region 11 is set to a size that outputs a radio wave having a wavelength equal to that of a radio wave transmitted from the radio wave radar 1 when the radio wave is incident on the resonance region 11. The interval between the opening regions 10 is set to satisfy the heat generation performance required for the conductive thin film 8, in other words, the interval of the heat generation performance of the conductor that can melt the ice and snow adhering to the radio wave transmission cover. Specifically, the length a, the distance p, and the width w are determined so as to satisfy the following expression "(a +2w) < p < (λ/2) < (λ + a +2w) … (a)" with respect to the wavelength λ of the radio wave incident on the resonance region 11.
By determining the length "a" in this manner, the size of each resonance region 11 can be set to a size that enables a radio wave having a wavelength equal to that of the radio wave to be output when the radio wave is incident on the resonance region 11. By determining the distance p and the width w as described above, the interval between the opening regions 10 is set to satisfy the heat generation performance required for the conductive thin film 8.
Each of the open regions 10 is arranged to have a distance 2d between adjacent open regions 10. The length a, the distance p, the width w, and the distance 2d are also determined so as to satisfy the following expressions "p ═ a +2w +2d … (B)" and "2 d ═ a +2w … (C)".
Next, the operation of the radio wave transmission cover 2 will be described.
A conductive thin film 8 is provided on the surface of the cover base material 3 of the radio wave transmission cover 2 on the vehicle exterior side, and the portions other than the opening region 10 and the resonance region 11 of the conductive thin film 8 generate heat by energization. The heat generation of this portion satisfies the heat generation performance required for the conductive thin film 8. Further, if a radio wave is incident on the resonance region 11 of the conductive thin film 8, a radio wave having a wavelength equal to that of the radio wave is output from the resonance region 11. Therefore, the radio wave is in the same state as the state after passing through the resonance region 11, and the required radio wave transmission performance is also ensured.
According to the present embodiment described in detail above, the following effects are obtained.
(1) Both suppression of the shortage of the heat generation performance of the radio wave transmission cover 2 and securing of the required radio wave transmission performance can be achieved.
(2) Since the resonance region 11 and the open region 10 are square, they are easily arranged regularly with respect to the conductive thin film 8. Further, by determining the length a, the distance p, and the width w so as to satisfy the above expression (a), it is possible to suppress the lack of the heat generation performance of the radio wave transmission cover 2, and to suppress the generation of grating lobes to ensure the required radio wave transmission performance.
(3) If the distance 2d is set to "2 d < a +2 w", the resistance value of the conductive thin film 8 increases, and it becomes difficult for current to flow, and there is a possibility that the power generation performance required for the conductive thin film 8 cannot be satisfied. On the other hand, if the distance 2d is set to "2 d > a +2 w", the resistance value of the conductive thin film 8 decreases, and therefore, the conductive thin film 8 may not generate heat sufficiently due to the value of the current flowing through the conductive thin film 8, and the power generation performance required of the conductive thin film 8 may not be satisfied. However, since the distance 2d is determined so as to satisfy the formulas (B) and (C), it is possible to suppress the failure to satisfy the power generation performance required for the conductive thin film 8 as described above. As a result, the heat generation performance of the conductive thin film 8 when the current is applied to the conductive thin film 8 can be set to the performance required for the conductive thin film 8.
(4) Since the conductive thin film 8 is provided on the surface of the cover base material 3 on the vehicle exterior side, the ice and snow adhering to the radio wave transmission cover 2 can be efficiently melted by the heat generation of the conductive thin film 8. Further, since the conductive thin film 8 is formed to be transparent, it is possible to suppress the decoration applied to the cover base material 3 from being hidden by the conductive thin film 8 when viewed from the vehicle exterior side.
The above embodiment can be modified as follows, for example.
The distance 2d does not need to be determined so as to satisfy the formula (C). For example, the distance 2d may be determined to be a value close to "a +2 w".
The radio wave radar 1 is exemplified as a device that transmits and receives radio waves, but other devices may be used.
The conductive thin film 8 need not necessarily be provided on the vehicle exterior side surface of the cover substrate 3, and may be provided on the vehicle interior side surface of the cover substrate 3 (the right side in fig. 1).
The shapes of the resonance region 11 and the opening region 10 may be other than a square such as a circle.
The radio wave transmitted and received by the radio wave radar 1 may be a radio wave other than a millimeter wave.
The conductive thin film 8 need not necessarily be formed of silver, and can be formed of other materials such as Indium Tin Oxide (ITO), for example.
The cover base 3 may be formed of a resin other than ASA resin such as AES resin.
The transparent layer 7 and the protective layer 9 may be formed of a transparent resin other than polycarbonate such as acrylic resin.
Description of the reference numerals
1 … wave radar, 2 … wave penetration cover, 3 … cover substrate, 4 … base layer, 5 … convex part, 6 … design layer, 7 … transparent layer, 8 … conductive film, 9 … protective layer, 10 … opening region, 11 … resonance region and 12 … hole.
Claims (4)
1. A radio wave transmitting cover comprising a cover base material made of resin and provided on a path of a radio wave transmitted and received by a device, and a conductive thin film provided on a surface of the cover base material and generating heat by energization,
the radio wave transmission cover is characterized in that:
the conductive thin film has a plurality of opening regions each formed by an annular hole and a plurality of resonance regions each insulated by being surrounded by the opening regions, the opening regions and the resonance regions being provided at intervals so as to be regularly arranged with respect to the conductive thin film,
the size of each resonance region is set to a size that outputs a radio wave having a wavelength equal to that of the radio wave when the radio wave is incident on the resonance region,
the interval between the open regions is set to an interval that satisfies the heat generation performance required for the conductive thin film.
2. A radio wave penetration cover according to claim 1,
each resonance region is arranged so as to form a square having a side length of a and to have a distance p between centers of adjacent resonance regions,
each of the opening regions is formed to have a width w around a corresponding one of the plurality of resonance regions,
the size of each resonance region is set to a size that outputs a radio wave having a wavelength equal to the radio wave when the radio wave is incident on the resonance region, and the interval between the opening regions is set to an interval that satisfies the heat generation performance required for the conductive thin film, and the length a, the distance p, and the width w are determined so that the following expression "(a +2w) < p < (λ/2) < (λ + a +2 w)" is satisfied with respect to the wavelength λ of the radio wave incident on the resonance region.
3. A wave-penetrating cover according to claim 2,
each opening region is arranged with a distance 2d between the opening regions adjacent thereto,
the length a, the distance p, the width w, and the distance 2d are determined so as to satisfy the following expressions "p + a +2w +2 d" and "2 d + a +2 w".
4. The radio wave penetration cover according to any one of claims 1 to 3,
the cover base material is arranged on a path of a radio wave received and transmitted by a radio wave radar mounted on a vehicle,
the conductive thin film is provided on the surface of the cover base material on the vehicle exterior side, and is formed in a transparent manner.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019-064012 | 2019-03-28 | ||
| JP2019064012A JP2020165691A (en) | 2019-03-28 | 2019-03-28 | Radio wave transmission cover |
| PCT/JP2020/007819 WO2020195493A1 (en) | 2019-03-28 | 2020-02-26 | Radio wave transmissive cover |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216133188U true CN216133188U (en) | 2022-03-25 |
Family
ID=72611859
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202090000447.8U Active CN216133188U (en) | 2019-03-28 | 2020-02-26 | Electric wave penetration cover |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2020165691A (en) |
| CN (1) | CN216133188U (en) |
| WO (1) | WO2020195493A1 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4999639A (en) * | 1989-03-03 | 1991-03-12 | Hazeltine Corporation | Radome having integral heating and impedance matching elements |
| JP2014158073A (en) * | 2013-02-14 | 2014-08-28 | Mitsubishi Electric Corp | Antenna device |
| CN204125790U (en) * | 2014-09-17 | 2015-01-28 | 中国人民解放军总后勤部军需装备研究所 | Wave frequency selects logical textiles thoroughly |
| JP6738778B2 (en) * | 2017-08-24 | 2020-08-12 | 株式会社Ｓｏｋｅｎ | Radar equipment |
-
2019
- 2019-03-28 JP JP2019064012A patent/JP2020165691A/en active Pending
-
2020
- 2020-02-26 WO PCT/JP2020/007819 patent/WO2020195493A1/en active Application Filing
- 2020-02-26 CN CN202090000447.8U patent/CN216133188U/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020195493A1 (en) | 2020-10-01 |
| JP2020165691A (en) | 2020-10-08 |
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