JP2013095997A - 電磁波透過用金属被膜、電磁波透過用金属被膜の製造方法及び車載用レーダ装置用のレドーム - Google Patents
電磁波透過用金属被膜、電磁波透過用金属被膜の製造方法及び車載用レーダ装置用のレドーム Download PDFInfo
- Publication number
- JP2013095997A JP2013095997A JP2011242302A JP2011242302A JP2013095997A JP 2013095997 A JP2013095997 A JP 2013095997A JP 2011242302 A JP2011242302 A JP 2011242302A JP 2011242302 A JP2011242302 A JP 2011242302A JP 2013095997 A JP2013095997 A JP 2013095997A
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- Prior art keywords
- electromagnetic wave
- metal
- metal film
- wave transmission
- film
- Prior art date
- 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.)
- Granted
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Classifications
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
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- B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
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- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
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- C23C18/18—Pretreatment of the material to be coated
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
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- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
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- C23C18/48—Coating with alloys
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- 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
- G01S7/032—Constructional details for solid-state radar subsystems
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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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- 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
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- 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
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Abstract
【解決手段】上記課題を解決するため、基材の表面に無電解めっき工程を経て設けられた、単位面積(1mm2)当たり10000個を超える微細金属領域から成る金属被膜であって、互いに隣接する微細金属領域が電気的に隔離されていることを特徴とする電磁波透過用金属被膜、当該電磁波透過用金属被膜の製造方法、及び当該金属被膜を用いた車載用レーダ装置用のレドームを提供する。
【選択図】図1
Description
まず、本件発明に係る電磁波透過用金属被膜について説明する。本件発明に係る電磁波透過用金属被膜は、基材の表面に電解めっき工程を経て設けられた、単位面積(1mm2)当たり10000個を超える微細金属領域の集合体から成る金属被膜であって、互いに隣接する微細金属領域が電気的に隔離されていることを特徴とする。図1に示すように、互いに隣接する微細金属領域は絶縁チャネル(クラック)により、電気的に隔離されており、当該絶縁チャネルは平面視において網目状に分布している。このように、本件発明に係る電磁波透過用金属被膜は、絶縁チャネルに囲まれた無数の微細金属領域の集合体として構成されたものである。なお、図1において、絶縁チャネルは黒い線状に視認される微細な領域であり、微細金属領域はこれらの絶縁チャネルに囲まれた白く所定の面積を有する領域である。以下、金属被膜、基材の順に説明する。なお、本実施の形態では、主として、自動車等に搭載されるミリ波レーダ装置から出入射するミリ波を透過可能なミリ波透過用の金属被膜を例に挙げて説明する。
本件発明に係る金属被膜は、上述のとおり、微細な絶縁チャネルにより囲まれた極めて微細な金属領域の集合体であり、基材の表面がこれらの微細金属領域により不連続に被覆される。
次に、上記電磁波透過用金属被膜の製造方法を説明する。本件発明に係る電磁波透過用金属皮膜の製造方法は、基材の表面に金属被膜を形成し、当該金属被膜に残留した内部応力により当該金属被膜にクラックを生じさせて、単位面積(1mm2)当たり10000個を超える微細金属領域の集合体から成る金属被膜を得ることを特徴とする。このように、本件発明では、微細金属領域の集合体としての電磁波透過用金属被膜を得る際に金属被膜を微細に分割させるための特別な処理を有していないことを特徴としている。すなわち、本件発明によれば、熱処理等の方法により、金属被膜にクラックを生じさせる方法を採用していないため、例えば、樹脂製の基材を採用した場合であっても、基材に対して熱の影響が及ぶのを防止することができ、且つ、形状の均一なムラのない金属被膜を形成することができる。
以上説明した本件発明に係る電磁波透過用金属被膜は、ミリ波レーダ装置のカバー部材(レドーム)を装飾する金属被膜として好適に用いることができる。
塩化パラジウム :0.01M(mol/L)
次亜リン酸ナトリウム :0.2M
チオジグリコール酸 :3.0g/L
比較例1では、基材を以下の無電解パラジウム−リン合金めっき浴に浸漬し、浴温を50℃、浸漬時間を30秒に変更した以外は、実施例1と同様にして電磁波透過用金属被膜を得た。このとき基材の表面に設けられた微細金属領域の分布率は3614/mm2であり、当該微細金属領域の平均最大幅は23.5μm(一辺平均長さ:5.7μm)であった。
塩化パラジウム :0.01M(mol/L)
次亜リン酸ナトリウム :0.2M
チオジグリコール酸 :200mg/L
比較例2では、基材を無電解パラジウム−リン合金めっき浴に浸漬する時間を70秒に変更した以外は、比較例1と同様にして電磁波透過用金属被膜を得た。このとき基材の表面に設けられた微細金属領域の分布率は496/mm2であり、当該微細金属領域の平均最大幅は63.5μm(一辺平均長さ:45.0μm)であった。
比較例3では、チオジグリコール酸を添加しない以外は比較例1と同様の無電解パラジウムーリン合金めっき浴を採用し、他条件は比較例1と同様にして電磁波透過用金属被膜を得た。このとき基材の表面に設けられた微細金属領域の分布率は2267/mm2であり、当該微細金属領域の平均最大幅は21.0μm(一辺平均長さ:14.9μm)であった。
比較例5では、基材を無電解パラジウムーリン合金めっき浴に浸漬する時間を70秒に変更した以外は、比較例3と同様にして電磁波透過用金属被膜を得た。このとき基材の表面に設けられた微細金属領域の分布率は887/mm2であり、当該微細金属領域の平均最大幅は47.5μm(一辺平均長さ:33.7μm)であった。
各実施例及び比較例で得た電磁波透過用金属被膜の76.6GHzにおける電磁波透過減衰量をアジレント社製 ネットワークアナライザーを用いて測定した。測定の際には、まず、ポリカーボネート製の基材自体の電磁波透過減衰量を測定しておき、次に、各実施例及び比較例において得た試料(基材+電磁波透過用金属被膜)全体の電磁波透過減衰量を測定した。そして、各試料の電磁波透過減衰量から基材自体の電磁波透過減衰量を差し引き、各実施例及び比較例で得た電磁波透過用金属被膜自体の電磁波透過減衰量を求めた。結果を表1に示す。また、微細金属領域の平均最大幅に対して、電磁波透過減衰率を示したグラフを図4に示す。
Claims (10)
- 基材の表面に無電解めっき工程を経て設けられた、単位面積(1mm2)当たり10000個を超える微細金属領域から成る金属被膜であって、互いに隣接する微細金属領域が電気的に隔離されていることを特徴とする電磁波透過用金属被膜。
- 前記微細金属領域は絶縁チャネルを介して互いに隣接し、当該絶縁チャネルは網目状に分布する請求項1に記載の電磁波透過用金属被膜。
- 前記微細金属領域の平均最大幅は、14.1μm以下である請求項1又は請求項2に記載の電磁波透過用金属被膜。
- 前記金属被膜の膜厚は、1μm以下である請求項1〜請求項3のいずれか一項に記載の電磁波透過用金属被膜。
- 当該金属被膜は、パラジウム又はパラジウム合金から成るものである請求項1〜請求項4のいずれかに一項に記載の電磁波透過用金属被膜。
- 当該金属被膜は、金属光沢を有するものである請求項1〜請求項5のいずれか一項に記載の電磁波透過用金属被膜。
- 無電解めっき法により、基材の表面に金属被膜を形成し、当該金属被膜に残留した内部応力により当該金属被膜を分割させて、単位面積(1mm2)当たり10000個を超える微細金属領域の集合体から成る金属被膜を得ること、
を特徴とする電磁波透過用金属被膜の製造方法。 - 前記金属被膜の厚みが1μm以下となるように、前記基材の表面に金属被膜を形成する請求項7に記載の電磁波透過用金属被膜の製造方法。
- 前記金属被膜を無電解めっき法により形成する際には、無電解パラジウムめっき液又は無電解パラジウム合金めっき液を用い、前記基材の表面にパラジウム被膜又はパラジウム合金被膜を形成する請求項7又は請求項8に記載の電磁波透過用金属被膜の製造方法。
- 請求項1〜請求項6のいずれか一項に記載の電磁波透過用金属被膜を基材の表面に備えたカバー部材を用いることを特徴とする車載用レーダ装置用のレドーム。
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JP2013253283A (ja) * | 2012-06-06 | 2013-12-19 | Kanto Gakuin | 無電解めっき浴 |
JP2017501376A (ja) * | 2013-10-17 | 2017-01-12 | ローベルト ボッシュ ゲゼルシャフト ミット ベシュレンクテル ハフツング | 自動車用レーダーセンサのためのカバー |
US10381718B2 (en) | 2013-10-17 | 2019-08-13 | Robert Bosch Gmbh | Cover for a radar sensor for motor vehicles |
US10629984B2 (en) | 2013-10-17 | 2020-04-21 | Robert Bosch Gmbh | Cover for a radar sensor for motor vehicles |
JPWO2017179463A1 (ja) * | 2016-04-12 | 2019-02-14 | ソニー株式会社 | 構造体、電子機器、加飾フィルム、及び構造体の製造方法 |
WO2018180476A1 (ja) * | 2017-03-31 | 2018-10-04 | ソニー株式会社 | 構造体、加飾フィルム、構造体の製造方法、及び加飾フィルムの製造方法 |
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CN103958735B (zh) | 2017-04-05 |
JP5665234B2 (ja) | 2015-02-04 |
EP2775011A1 (en) | 2014-09-10 |
WO2013065845A1 (ja) | 2013-05-10 |
EP2775011A4 (en) | 2015-08-19 |
US20140313100A1 (en) | 2014-10-23 |
EP2775011B1 (en) | 2018-02-28 |
KR20140097147A (ko) | 2014-08-06 |
KR101889044B1 (ko) | 2018-08-20 |
US9919493B2 (en) | 2018-03-20 |
CN103958735A (zh) | 2014-07-30 |
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