JP2011027434A - Method of forming decorative coating on surface of resin base material and exterior decoration member having the decorative coating - Google Patents

Method of forming decorative coating on surface of resin base material and exterior decoration member having the decorative coating Download PDF

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JP2011027434A
JP2011027434A JP2009170463A JP2009170463A JP2011027434A JP 2011027434 A JP2011027434 A JP 2011027434A JP 2009170463 A JP2009170463 A JP 2009170463A JP 2009170463 A JP2009170463 A JP 2009170463A JP 2011027434 A JP2011027434 A JP 2011027434A
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vapor deposition
aluminum
forming
island
base material
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Ryosuke Maekawa
諒介 前川
Yasufumi Shibata
靖文 柴田
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Toyota Motor Corp
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Toyota Motor Corp
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<P>PROBLEM TO BE SOLVED: To provide a method of forming a decorative coating having both superior artistic design properties due to metallic luster and radar beam transmittance which are equivalent to those obtianed, when using indium in spite of using metal lower in price than indium without using expensive indium, as to an exterior decoration disposed in a radar beam route of a radar device. <P>SOLUTION: Aluminum is vacuum-deposited on the surface of a resin base material at a deposition rate of 300 μm/h to 500 μm/h, thereby forming the decorative coating thereon. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、レーダ装置の経路内に配設させて用いられる樹脂基材表面上に、金属蒸着部からなる装飾皮膜を形成する方法と、該装飾皮膜を樹脂基材の表面に有する外装装飾部材に関する。   The present invention relates to a method for forming a decorative film made of a metal vapor-deposited portion on a resin base material surface used by being disposed in a path of a radar apparatus, and an exterior decorative member having the decorative film on the surface of the resin base material About.

近年、オートクルーズシステムと呼ばれる、車両前方に搭載されているセンサによって前方車両と自車との車間距離や相対速度を測定し、この情報に基づいて、スロットルやブレーキを制御し、自車を加減速しながら車間距離をコントロールする技術が注目を集めている。このオートクルーズシステムに使用されるセンサとして、一般に、ミリ波レーダなどの電波レーダ装置が使用されている。   In recent years, an inter-vehicle distance and relative speed between a vehicle in front and the vehicle is measured by a sensor mounted in front of the vehicle, called an auto-cruise system, and the throttle and brake are controlled based on this information to add the vehicle. The technology that controls the distance between vehicles while decelerating is attracting attention. Generally, a radio wave radar device such as a millimeter wave radar is used as a sensor used in the auto cruise system.

図4に示すように、車両に装備されるレーダ装置100は、上述したように車両前方の位置に設けられ、その性能を発揮するために、一般に、フロントグリル101中央の背後に配置されることとなる。フロントグリル101中央には、車両製造会社のエンブレム102や該車両に特有な装飾品が装着されるのが一般的である。よって、レーダ装置から照射されるレーダビームは、フロントグリル101およびエンブレム102を透過して検出物に向かい、その検出物から戻ってきたレーダビームもまた、フロントグリル101およびエンブレム102を透過してレーダ装置に戻ることとなる。しかし、フロントグリル101は、意匠性を高めるために金属皮膜により光輝性をもたせたものであることが多く、その場合、その金属皮膜がレーダビームを遮断、又は減衰させるため、良好なレーダの感度を得ることが困難となる場合がある。   As shown in FIG. 4, the radar device 100 installed in the vehicle is provided at a position in front of the vehicle as described above, and is generally disposed behind the center of the front grill 101 in order to exhibit its performance. It becomes. In the center of the front grill 101, an emblem 102 of a vehicle manufacturer or an ornament unique to the vehicle is generally mounted. Therefore, the radar beam emitted from the radar device passes through the front grill 101 and the emblem 102 and travels toward the detected object, and the radar beam returned from the detected object also passes through the front grill 101 and the emblem 102 and passes through the radar. Return to the device. However, in many cases, the front grill 101 is provided with glitter by a metal film in order to enhance the design, and in this case, the metal film blocks or attenuates the radar beam, so that the radar sensitivity is good. May be difficult to obtain.

このような事情から、レーダ装置が配置される箇所に対応するフロントグリルの部分に、レーダビームが透過可能な窓部が設けられる。フロントグリルに窓部が設けられることにより、レーダビームの出入りは容易となるが、その一方で、フロントグリルの外観が連続性を失うこととなり、また、この窓部より、車両の内側のレーダ装置やエンジンルームなどが目視可能となって、車両の外観が損なわれる恐れがある。   Under such circumstances, a window portion through which a radar beam can be transmitted is provided at a portion of the front grill corresponding to a location where the radar device is disposed. By providing a window on the front grille, the radar beam can easily enter and exit, but on the other hand, the appearance of the front grille loses its continuity. As a result, the exterior of the vehicle may be damaged.

その解決手段として、特許文献1には、プラスチックを複数層に積層し、前記プラスチックの外部から視認される部分に、インジウムからなる島状の金属蒸着部が不連続に存在する装飾皮膜を樹脂基材表面に有する外装装飾部材を、フロントグリルに形成した窓部に取り付けて窓部を被覆することが記載されている。そのような外装装飾部材を用いることにより、外装装飾部材中にもフロントグリルのフィン部材が連続して存在しているような印象を与えることができ、レーダビームの出入りは可能でありながら、窓部とフロントグリル本体とに一体感をもたせることができる。   As a means for solving this problem, Patent Document 1 discloses a resin coating in which a plastic film is laminated in a plurality of layers, and an island-shaped metal vapor deposition portion made of indium is discontinuously present on a portion visible from the outside of the plastic. It describes that an exterior decoration member on the surface of a material is attached to a window portion formed on a front grill to cover the window portion. By using such an exterior decoration member, it is possible to give an impression that the fin members of the front grille are continuously present in the exterior decoration member, and the radar beam can enter and exit, but the window The unit and the front grill body can have a sense of unity.

上記のように、従来、レーダ装置のレーダビーム経路内に配設される外装装飾部材において、装飾皮膜として蒸着される金属としては、電波透過性が比較的高いインジウムが一般的に用いられている。   As described above, conventionally, in an exterior decorative member disposed in a radar beam path of a radar apparatus, indium having a relatively high radio wave transmission property is generally used as a metal deposited as a decorative film. .

ところで、金属の蒸着処理では、どんな金属であっても、蒸着初期には、基材の表面に一様な膜状に形成されるのではなく、微細な島状に形成される。そして、外観上、金属光沢をもつ、と視認されるまで蒸着を続けると、ほとんどの金属の場合、各々の島状の蒸着部は成長して大きくなり、また島状の蒸着部同士が相互に連続した状態となることにより、基材の表面のほとんどが金属蒸着部で覆われ、何も蒸着されていない非蒸着部がほとんどない状態となる。すなわち、島状の蒸着部が連続構造となった装飾皮膜が形成される。   By the way, in the metal vapor deposition process, any metal is not formed in a uniform film shape on the surface of the substrate at the initial stage of vapor deposition, but is formed in a fine island shape. And if the vapor deposition is continued until it is visually recognized as having a metallic luster, in the case of most metals, each island-like vapor deposition part grows and becomes large, and the island-like vapor deposition parts mutually By being in a continuous state, most of the surface of the substrate is covered with the metal vapor deposition part, and there is almost no non-vapor deposition part where nothing is vapor deposited. That is, a decorative film is formed in which island-shaped vapor deposition portions have a continuous structure.

それに対して、インジウムは、外観上、金属光沢をもつ、と視認されるまで蒸着を続けた場合でも、基材の表面はインジウムが蒸着された微細な島状の蒸着部と、何も蒸着されていない非蒸着部とが混在した装飾皮膜、すなわち、インジウムによる島状の蒸着部が不連続に存在する装飾皮膜が形成される。そして、レーダビームのほとんどは前記非蒸着部を透過して出入りする。つまり、基材の表面に形成されたインジウムの蒸着層は、金属光沢による優れた意匠性とレーダビーム透過性の両方を兼ね備えることができる。しかしながら、蒸着金属としてインジウムを用いる場合、インジウムは高価であることから、原料コストが高くなるという問題を内在している。   On the other hand, even if indium continues to be vapor-deposited until it is visually recognized as having a metallic luster, the surface of the base material is deposited with a fine island-shaped vapor-deposited part on which indium is vapor-deposited. A decorative coating in which non-deposited portions are mixed, that is, a decorative coating in which island-shaped deposited portions of indium are discontinuously formed is formed. Then, most of the radar beam enters and exits through the non-deposition portion. That is, the indium vapor deposition layer formed on the surface of the substrate can have both excellent design properties due to metallic luster and radar beam transparency. However, when indium is used as the vapor deposition metal, indium is expensive, so that the problem of high raw material costs is inherent.

特許文献2には、電波透過性を有する外装装飾部材において、樹脂基材の表面に第1膜として、インジウムを蒸着し、該第1膜を空気に触れさせて改質させた表面に、第2膜として、インジウム以外の金属、例えばクロムを蒸着することによって前記した形態の装飾皮膜を形成することが記載されている。この形成方法を採用することにより、高価なインジウムの使用量を低減することができる。   In Patent Document 2, in an exterior decorative member having radio wave permeability, indium is vapor-deposited as a first film on the surface of a resin base material, and the first film is exposed to air and modified on the surface. It is described that the decorative film having the above-described form is formed by vapor-depositing a metal other than indium, for example, chromium, as the two films. By employing this formation method, the amount of expensive indium used can be reduced.

また、特許文献3には、電波レーダユニットの前方に配設される車両の外装装飾部材において、前記した装飾皮膜を形成する蒸着金属としてインジウムの他に、電波透過性が比較的高い、クロム、錫、アルミニウム及び金を用い得ることが記載されている。   Further, in Patent Document 3, in the exterior decorative member of a vehicle disposed in front of the radio wave radar unit, in addition to indium as a vapor deposition metal for forming the above-described decorative film, chromium, It is described that tin, aluminum and gold can be used.

特開2000−159039号公報Japanese Unexamined Patent Publication No. 2000-159039 特開2007−162125号公報JP 2007-162125 A 特開2008−24254号公報JP 2008-24254 A

レーダ装置のレーダビーム経路内に配設される外装装飾部材において、特許文献2に記載の技術を採用することにより、インジウムの使用量が低減されると同時に、樹脂基材上に金属光沢による優れた意匠性とレーダビーム透過性を有する装飾皮膜が形成することができる。しかし、少ないながらも、インジウムを使用している以上、コスト低減には限界がある。また、2段階に分けて蒸着を行っていることで、生産効率の低下も懸念される。   In the exterior decoration member arranged in the radar beam path of the radar apparatus, the amount of indium used is reduced by adopting the technique described in Patent Document 2, and at the same time, the metallic luster on the resin substrate is excellent. A decorative coating having a good design and radar beam transparency can be formed. However, although it is small, there are limits to cost reduction as long as indium is used. In addition, since the vapor deposition is performed in two stages, there is a concern about a decrease in production efficiency.

特許文献3では、電波レーダユニットの前方に配設された車両の外装装飾部材の装飾皮膜を形成する蒸着金属としてインジウム以外に、クロム、錫、アルミニウム及び金を用い得るとの記載があるが、それ以上の記載、すなわち、蒸着方法など、具体的な処理態様については、記述がなされていない。   In Patent Document 3, there is a description that chromium, tin, aluminum, and gold can be used in addition to indium as a vapor deposition metal that forms a decorative coating of a vehicle exterior decorative member disposed in front of a radio wave radar unit. No further description, that is, no specific processing mode such as a vapor deposition method is described.

本発明は、上記の事情に鑑みてなされたものであり、レーダ装置のレーダビーム経路内に配設される外装装飾部材を形成するに際し、高価なインジウムを使用することなく、インジウムより安価な金属を用いながら、インジウムを用いた場合と同等の金属光沢による優れた意匠性とレーダビーム透過性とを兼ね備えた装飾皮膜を形成することを可能とする、より改良された樹脂基材表面への装飾皮膜の形成方法を提供することを目的とする。また、インジウムより安価な金属を用いながら、インジウムを用いた場合と同等の金属光沢による優れた意匠性とレーダビーム透過性とを兼ね備えた装飾皮膜を有する、レーダ装置のレーダビーム経路内に配設される外装装飾部材を提供することも目的とする。   The present invention has been made in view of the above circumstances, and in forming an exterior decorative member disposed in a radar beam path of a radar apparatus, a metal that is less expensive than indium without using expensive indium. More improved decoration on the surface of the resin base material, which enables the formation of a decorative film that has both excellent design with a metallic luster equivalent to the case of using indium and radar beam transparency It aims at providing the formation method of a membrane | film | coat. In addition, while using a metal that is cheaper than indium, it has a decorative coating that has both a good design with a metallic luster equivalent to the case of using indium and radar beam transparency, and is placed in the radar beam path of the radar device. It is another object of the present invention to provide an exterior decoration member.

発明者らは、上記の課題を解決すべく、特許文献3などにおいて、電波レーダユニットの前方に配設される車両の外装装飾部材において、従来から使用可能であると提案されている、電波透過性が比較的高い、クロム、錫、アルミニウム及び金の中でも、特に、蒸着処理によって、島状の蒸着部が不連続に存在する、すなわち、不連続構造の装飾皮膜を形成しやすいと考えられるアルミニウムに注目し、従来知られているインジウムを蒸着する場合と同じ蒸着条件で樹脂基材上に蒸着する実験を行った。しかし、金属光沢による優れた意匠性を有する装飾皮膜は形成できなかった。
その理由は、次のように考えられる。すなわち、金属の蒸着処理においては、蒸着初期には基材上に金属の核が形成され、それが蒸着時間とともに成長していき、また、単位面積当たりに生じる前記金属の核の数は蒸着速度が小さいと少なく、蒸着速度が大きくなると増えていくことが知られている。
In order to solve the above-mentioned problems, the inventors have proposed that, in Patent Document 3 and the like, a vehicle exterior decorative member disposed in front of a radio wave radar unit can be used conventionally. Among chromium, tin, aluminum, and gold, which are relatively high in properties, in particular, it is considered that island-like vapor-deposited portions exist discontinuously by vapor deposition, that is, it is easy to form a discontinuous decorative film In view of the above, an experiment was performed in which deposition is performed on a resin base material under the same deposition conditions as those for depositing conventionally known indium. However, a decorative film having an excellent design property due to metallic luster could not be formed.
The reason is considered as follows. That is, in the metal vapor deposition process, metal nuclei are formed on the substrate at the initial stage of vapor deposition, which grows with the vapor deposition time, and the number of metal nuclei generated per unit area depends on the vapor deposition rate. It is known that when the deposition rate is large, it increases when the deposition rate increases.

図1(b)に示すように、蒸着速度が小さいときには、基材1に形成される金属の核20の数は少なく、金属の核20は隣同士が大きく離れて形成される。金属の核20は時間とともに成長し、島状の金属蒸着部21となる。この場合、島状の金属蒸着部21は隣同士が大きく離れて形成され、島上の金属蒸着部21間の金属非蒸着部22の部分が大きいので、装飾皮膜2は、金属光沢が低く、意匠性が悪いと視認される。   As shown in FIG. 1B, when the deposition rate is low, the number of metal nuclei 20 formed on the substrate 1 is small, and the metal nuclei 20 are formed so as to be separated from each other. The metal core 20 grows with time and becomes an island-shaped metal vapor deposition portion 21. In this case, the island-shaped metal vapor deposition portions 21 are formed so as to be separated from each other, and the portion of the metal non-vapor deposition portion 22 between the metal vapor deposition portions 21 on the island is large. It is visually recognized that the nature is bad.

逆に、蒸着速度が大きいときには、図1(c)に示すように、基材1に形成される金属の核20の数が多くなり、金属の核20は、隣同士が接触するように形成されたり、又は、先にできた金属の核20の上に新たに金属の核20が形成されたりする。複数の金属の核20が接着することによって、複数の核だったものが、1つの核となり、その核自体が島状の金属蒸着部21となったり、または、金属の核20が成長した、島状の金属蒸着部21同士が接触して1つの金属蒸着部21となったりする。結果として、金属蒸着部21同士が接着するくらいに密に形成された、連続構造に近い装飾皮膜2となる。この形態の装飾皮膜2は、金属光沢が高く、意匠性に優れていると視認される。しかし、この場合、金属蒸着部21の間に金属非蒸着部が存在しないことから、レーダビームの透過が困難となり、透過減衰量が非常に大きくなる。   Conversely, when the deposition rate is high, as shown in FIG. 1C, the number of metal nuclei 20 formed on the substrate 1 increases, and the metal nuclei 20 are formed so that the adjacent ones are in contact with each other. Or a new metal nucleus 20 is formed on the previously formed metal nucleus 20. By bonding a plurality of metal nuclei 20, what was a plurality of nuclei becomes one nucleus, the nucleus itself becomes an island-shaped metal vapor deposition portion 21, or the metal nucleus 20 grows. The island-shaped metal vapor deposition portions 21 come into contact with each other to form one metal vapor deposition portion 21. As a result, the decorative coating 2 is formed so densely that the metal vapor-deposited portions 21 adhere to each other and has a continuous structure close to that of the continuous structure. The decorative coating 2 of this form is visually recognized as having high metallic luster and excellent design. However, in this case, since there is no metal non-deposition portion between the metal deposition portions 21, it is difficult to transmit the radar beam, and the transmission attenuation amount becomes very large.

すなわち、レーダ装置のレーダビーム経路内に配設される外装装飾部材が有する装飾皮膜を形成するにあたって、前記外装装飾部材が、金属光沢による優れた意匠性と、必要となるレーダビームの透過性とを両立するためには、蒸着金属の種類に依存する適切な蒸着速度範囲があり、アルミニウムについて、この蒸着速度の適正な範囲を見出すことにより、前記課題を解決できると考えた。   That is, when forming the decorative coating of the exterior decoration member disposed in the radar beam path of the radar apparatus, the exterior decoration member has excellent design characteristics due to metallic luster, and required radar beam transparency. In order to achieve both, there is an appropriate deposition rate range depending on the type of deposited metal, and it was considered that the above-mentioned problem can be solved by finding an appropriate range of this deposition rate for aluminum.

そこで、アルミニウムの蒸着速度を種々変更して、樹脂基材の表面に装飾皮膜を形成する実験を行い、レーダ装置のレーダビーム経路内に配設させて用いられる樹脂基材上にアルミニウムによる装飾皮膜を形成するのに最適な蒸着速度を見出し、本発明を完成するに至った。   Therefore, various experiments were carried out to form a decorative film on the surface of the resin base material by changing the deposition rate of aluminum, and the decorative film made of aluminum was used on the resin base material that was placed in the radar beam path of the radar device. The optimum deposition rate for forming the film was found, and the present invention was completed.

すなわち、本発明の樹脂基材表面への装飾皮膜の形成方法は、レーダ装置のレーダビーム経路内に配設させて用いられる樹脂基材の表面に、金属蒸着部が不連続に存在する装飾皮膜を形成する方法であって、蒸着金属として、アルミニウムを用い、前記樹脂基材にアルミニウムを300μm/h〜500μm/hの蒸着速度で蒸着させることを特徴とする。上記の形成方法において、より好ましくは、前記蒸着速度を300μm/h〜450μm/hとする。また、上記の形成方法において、好ましくは、装飾皮膜の厚さが1〜5μmとなるようにする。   That is, the method for forming a decorative film on the surface of a resin base material according to the present invention includes a decorative film in which metal deposition portions are discontinuously present on the surface of a resin base material used by being disposed in a radar beam path of a radar apparatus. In which aluminum is used as a vapor deposition metal and aluminum is vapor-deposited on the resin substrate at a vapor deposition rate of 300 μm / h to 500 μm / h. In the above formation method, more preferably, the deposition rate is set to 300 μm / h to 450 μm / h. In the above formation method, the thickness of the decorative film is preferably 1 to 5 μm.

また、本発明は、上記の形成方法で形成された装飾皮膜を樹脂基材の表面に有する外装装飾部材も開示する。
本発明の外装装飾部材は、樹脂基材表面に島状のアルミニウム蒸着部が不連続に存在する装飾皮膜を有する、レーダ装置のレーダビーム経路内に配設される外装装飾部材であって、装飾皮膜を形成する金属蒸着部の厚さが1〜5μmであり、島状に蒸着されたアルミニウム蒸着部が前記樹脂基材に占める密度(島密度)が40個/μmであり、ミリ波透過減衰量が2dB以下であることを特徴とする。
Moreover, this invention also discloses the exterior decoration member which has the decoration film formed with said formation method on the surface of a resin base material.
An exterior decoration member of the present invention is an exterior decoration member disposed in a radar beam path of a radar apparatus, having a decoration film in which island-shaped aluminum vapor deposition portions are discontinuously present on the surface of a resin base material. The thickness of the metal deposition part forming the film is 1 to 5 μm, and the density (island density) of the aluminum deposition part deposited in an island shape in the resin base material is 40 / μm 2 , and transmits millimeter waves The attenuation is 2 dB or less.

本発明による樹脂基材表面への装飾皮膜の形成方法によると、コストを下げて、かつ先行特許文献2に示すような2段階蒸着に比べてより簡易な形成方法によって、金属光沢による優れた意匠性と高いレーダビーム透過性を両立できる装飾皮膜を樹脂基材の表面に形成することができる。また、そのようにして形成された装飾皮膜を樹脂基材の表面に有する外装装飾部材を得ることができる。   According to the method for forming a decorative film on the surface of a resin substrate according to the present invention, an excellent design due to metallic luster can be achieved by reducing the cost and by a simpler forming method as compared with the two-stage vapor deposition as shown in Prior Patent Document 2. And a radar film having a high radar beam permeability can be formed on the surface of the resin substrate. Moreover, the exterior decoration member which has the decoration film | membrane formed in that way on the surface of a resin base material can be obtained.

樹脂基材の表面に形成される装飾皮膜の構造を示した外装装飾部材の模式的な拡大断面図である。It is a typical expanded sectional view of the exterior decoration member which showed the structure of the decoration film formed on the surface of a resin base material. 本願の実施例での蒸着速度とミリ波透過減衰量の関係を示したグラフである。It is the graph which showed the relationship between the vapor deposition rate and the millimeter wave transmission attenuation amount in the Example of this application. 本願の実施例での蒸着速度と島密度の関係を示したグラフである。It is the graph which showed the relationship between the vapor deposition rate and island density in the Example of this application. 車両前方のフロントグリルおよびエンブレムと、車両内部に配置されたレーダ装置の配置関係を示した模式図である。It is the schematic which showed the arrangement | positioning relationship of the front grille and emblem of a vehicle front, and the radar apparatus arrange | positioned inside a vehicle.

本発明による樹脂基材表面への装飾皮膜の形成方法について、実施の形態に基づいて説明する。
図1(a)は、本発明の形成方法によって形成された島状の金属蒸着部が不連続に存在する、すなわち不連続構造の装飾皮膜を有する外装装飾部材の一例の模式的な拡大断面図であり、1は樹脂基材を、2はアルミニウムからなる装飾皮膜を示す。20〜22は、装飾皮膜2を形成している各要素を示しており、20は蒸着初期に形成されるアルミニウムの核、21はアルミニウムの核が時間とともに成長することによって形成される島状のアルミニウム蒸着部、22は島状のアルミニウム蒸着部間のアルミニウム非蒸着部を示す。
A method for forming a decorative film on the surface of a resin substrate according to the present invention will be described based on an embodiment.
FIG. 1A is a schematic enlarged cross-sectional view of an example of an exterior decorative member in which island-shaped metal vapor deposited portions formed by the forming method of the present invention are discontinuous, that is, has a decorative coating with a discontinuous structure. 1 represents a resin base material, and 2 represents a decorative film made of aluminum. 20-22 shows each element which forms the decorative film 2, 20 is an aluminum nucleus formed at the initial stage of vapor deposition, and 21 is an island shape formed by the aluminum nucleus growing over time. An aluminum vapor deposition part 22 is an aluminum non-vapor deposition part between the island-like aluminum vapor deposition parts.

樹脂基材としては、特に限定されないが、熱可塑性樹脂が好ましく、ポリカーボネート、アクリル樹脂、ポリスチレン、ポリ塩化ビニル、ポリウレタン等の板材、シート材、フィルム材が例示できる。中でも、ポリカーボネートは、耐候性の理由から好ましい。樹脂基材1の表面には、予め装飾皮膜の下地となる従来公知の下地膜が形成されていてもよいし、形成されていなくてもよい。   Although it does not specifically limit as a resin base material, A thermoplastic resin is preferable and plate materials, sheet materials, and film materials, such as a polycarbonate, an acrylic resin, a polystyrene, a polyvinyl chloride, a polyurethane, can be illustrated. Of these, polycarbonate is preferred for reasons of weather resistance. On the surface of the resin base material 1, a conventionally known base film that becomes a base of the decorative film may be formed in advance or may not be formed.

前記樹脂基材1の上、又は前記下地膜の上に300μm/h〜500μm/hの蒸着速度でアルミニウムを真空蒸着することで、前記した不連続構造の装飾皮膜2が形成される。蒸着方法には特に制限はなく、従来公知の方法を採用することができる。蒸着速度は、電圧・電流を変更することによって変更できる。後の実施例に示すように、蒸着速度は400μm/h前後であることは好ましく、蒸着速度が300μm/h未満の場合には、金属光沢が低く、意匠性が悪いといった不都合があり、500μm/hを超える場合には、レーダビームの透過性が悪いといった不都合があって、いずれも好ましくない。   The decorative film 2 having the above-described discontinuous structure is formed by vacuum-depositing aluminum on the resin base material 1 or the base film at a deposition rate of 300 μm / h to 500 μm / h. There is no restriction | limiting in particular in a vapor deposition method, A conventionally well-known method is employable. The deposition rate can be changed by changing the voltage / current. As shown in the following examples, the deposition rate is preferably around 400 μm / h, and when the deposition rate is less than 300 μm / h, there are disadvantages such as low metallic luster and poor design, When h is exceeded, there is an inconvenience that the permeability of the radar beam is poor, and neither is preferable.

本発明において、装飾皮膜の膜厚は特に限定されないが、1〜5μmが好ましい。1μm未満では、光輝性が低下する傾向となり、5μmを超えると、レーダビームの透過性を損なう傾向となるからである。なお、膜厚は、蒸着速度と時間とを選択することで、適宜設定することができる。   In the present invention, the thickness of the decorative film is not particularly limited, but is preferably 1 to 5 μm. If the thickness is less than 1 μm, the glitter tends to decrease, and if it exceeds 5 μm, the transparency of the radar beam tends to be impaired. The film thickness can be set as appropriate by selecting the deposition rate and time.

また、本発明の外装装飾部材においては、ミリ波透過減衰量が2dB以下であり、かつ、装飾皮膜の金属光沢を満足するために、島状のアルミニウム蒸着部の島密度が40個/μm以上であることが好ましい。ミリ波透過減衰量は2dB以下であっても、島密度が40個/μm未満では、樹脂基材表面上における島状のアルミニウム蒸着部が占める割合が低く、この場合には、金属光沢を満足しない恐れがあるので好ましくない。島密度が40個/μm以上であって金属光沢を満足している場合であっても、ミリ波透過減衰量が2dBを超えるものは、本発明の外装装飾部材として、好ましくない。この態様は、1個当たりの島状のアルミニウム蒸着部が大きくなりすぎて、非蒸着部の面積が少なくなる場合に、起こり得る。 Further, in the exterior decorative member of the present invention, the island wave density of the island-shaped aluminum vapor deposition portion is 40 / μm 2 so that the millimeter wave transmission attenuation is 2 dB or less and the metallic gloss of the decorative film is satisfied. The above is preferable. Even if the millimeter wave transmission attenuation is 2 dB or less, if the island density is less than 40 pieces / μm 2 , the proportion of the island-shaped aluminum vapor deposition portion on the surface of the resin substrate is low. It is not preferable because there is a fear of not being satisfied. Even when the island density is 40 pieces / μm 2 or more and the metallic luster is satisfied, the case where the millimeter wave transmission attenuation exceeds 2 dB is not preferable as the exterior decorative member of the present invention. This aspect can occur when the island-shaped aluminum vapor deposition portion per piece becomes too large and the area of the non-deposition portion is reduced.

本発明の装飾皮膜の形成方法によって形成された装飾皮膜を有する外装装飾部材は、従来のインジウムを用いた場合と同様に、レーダビーム透過性がよく、金属光沢による意匠性が高いため、車両のレーダビーム透過カバーとして使用が可能である。また、金属として安価なアルミニウムを採用しており、製造コストも低減する。前記透過カバーの具体的な適用部位としては、自動車のフロントグリル、エンブレム等が挙げられる。   The exterior decorative member having the decorative film formed by the method of forming the decorative film of the present invention has good radar beam permeability and high design by metallic luster, as in the case of using conventional indium. It can be used as a radar beam transmission cover. In addition, inexpensive aluminum is used as the metal, which reduces the manufacturing cost. Specific application parts of the transmission cover include a front grille, an emblem, and the like of an automobile.

以下、本発明の実施例と比較例を示す。
[実施例1〜4及び比較例1〜8]
板厚1mmの板状のポリカーボネート基材を用い、次の表1に示すとおり、実施例1〜4及び比較例1〜8の蒸着速度で、アルミニウムによる膜厚2μmの装飾皮膜を成膜し、装飾皮膜の島密度、ミリ波透過減衰量、および、色調(金属光沢)を調べた。
Examples of the present invention and comparative examples are shown below.
[Examples 1-4 and Comparative Examples 1-8]
Using a plate-like polycarbonate substrate with a plate thickness of 1 mm, as shown in the following Table 1, at a deposition rate of Examples 1 to 4 and Comparative Examples 1 to 8, a decorative film having a thickness of 2 μm was formed from aluminum. The island density, millimeter wave transmission attenuation, and color tone (metallic luster) of the decorative coating were examined.

蒸着条件は、アルバック機工社の真空蒸着装置を用い、加熱方式は電気加熱方式で、到達真空度1.3×10−4Pa以下とした。 The vapor deposition conditions were a vacuum vapor deposition apparatus manufactured by ULVAC KIKOH Co., Ltd., the heating method was an electric heating method, and the ultimate vacuum was 1.3 × 10 −4 Pa or less.

装飾皮膜の島密度は、装飾皮膜をSEMで観察し、500μm×500μmの範囲内にある島状のアルミニウム蒸着部の数を数え、1μmあたりの島状の蒸着数を島密度とした。 The island density of the decorative film was observed by SEM, the number of island-shaped aluminum vapor deposition portions in the range of 500 μm × 500 μm was counted, and the number of island-shaped vapor depositions per 1 μm 2 was defined as the island density.

ミリ波透過減衰量は、車載用のミリ波レーダの適用周波数である76.5GHzでのミリ波透過減衰量をヒューレットパッカード社のホーンアンテナを用いて測定した。色調は目視により、車両の外装装飾部材として、求められる金属光沢を満足するときはOK、金属光沢が不足するときはNGと判断した。   Millimeter-wave transmission attenuation was measured using a Hewlett-Packard horn antenna for millimeter-wave transmission attenuation at 76.5 GHz, which is an applied frequency of an in-vehicle millimeter-wave radar. The color tone was visually determined to be OK when the required metallic luster was satisfied as a vehicle exterior decoration member, and NG when the metallic luster was insufficient.

Figure 2011027434
Figure 2011027434

[考察]
図2に、蒸着速度とミリ波透過減衰量の関係をグラフとして示した。グラフ中では、表1に示すように、実施例1〜4をA〜D、比較例1〜8をE〜Lと示した。良好なレーダ性能をもつとされるのは、ミリ波透過減衰量が2dB以下とされているが、2dB以下のミリ波透過減衰量のものは、A〜Iの条件のものだけだった。これに、表1の色調(金属光沢)の結果を加えてみると、300μm/h〜500μm/hの蒸着速度でアルミニウムを蒸着した場合のみ、金属光沢、ミリ波透過減衰量を共に満足する結果が得られることが分かる。
[Discussion]
FIG. 2 is a graph showing the relationship between the deposition rate and the millimeter wave transmission attenuation. In the graph, as shown in Table 1, Examples 1 to 4 were indicated as A to D, and Comparative Examples 1 to 8 were indicated as E to L. The millimeter-wave transmission attenuation is considered to be 2 dB or less to have good radar performance, but the millimeter-wave transmission attenuation of 2 dB or less was only for the conditions of A to I. When the results of color tone (metallic luster) in Table 1 are added to this, only when aluminum is deposited at a deposition rate of 300 μm / h to 500 μm / h, both the metallic luster and millimeter wave transmission attenuation are satisfied. It can be seen that

図3に、蒸着速度と島密度の関係をグラフ化して示した。グラフにおいて、横軸は蒸着速度、縦軸は島密度である。グラフ中では、表1に示すように、実施例1〜4をA〜D、比較例1〜8をE〜Lと示した。蒸着速度400μm/hあたりまでは、蒸着速度に比例して、島密度は増加していくが、400μm/hを超えたあたりから、蒸着速度が大きくなっているにも関わらず、島密度が低下していく。特に、実施例1〜4では、最も少ない島密度で実施例1の42個/μm、最も多い島密度では実施例3の78個/μmとなっており、金属光沢(とミリ波透過性)を満足するためには島密度40個/μm以上が必要であると考えられる。 FIG. 3 is a graph showing the relationship between the deposition rate and the island density. In the graph, the horizontal axis represents the deposition rate, and the vertical axis represents the island density. In the graph, as shown in Table 1, Examples 1 to 4 were indicated as A to D, and Comparative Examples 1 to 8 were indicated as E to L. The island density increases in proportion to the deposition rate up to around the deposition rate of 400 μm / h, but the island density decreases from the point where it exceeds 400 μm / h, even though the deposition rate increases. I will do it. In particular, in Examples 1 to 4, the smallest island density was 42 / μm 2 of Example 1, and the largest island density was 78 / μm 2 of Example 3, and metallic luster (and millimeter wave transmission). It is considered that an island density of 40 pieces / μm 2 or more is necessary to satisfy the property.

これは、Iの速度範囲では、図1(b)に基づき、先に説明したようにして、IIの速度範囲では、図1(a)のような、IIIの速度範囲では図1(c)に基づき、先に説明したようにして、それぞれ装飾皮膜が形成されているからであると考えられる。すなわち、Iの速度範囲では、蒸着時に形成されるアルミニウムの核20の数が少ないため、アルミニウムの核20が時間とともに成長した島状のアルミニウム蒸着部21の数も少なく、島密度が低い。そのために、図3に示すように、ミリ波透過減衰量は2dB以下の条件は満足するが、良好な金属光沢は得られない。   In the speed range of I, as described above based on FIG. 1B, in the speed range of II, as shown in FIG. 1A, in the speed range of III, FIG. Based on the above, it is considered that the decorative films are formed as described above. That is, in the speed range of I, since the number of aluminum nuclei 20 formed at the time of vapor deposition is small, the number of island-shaped aluminum vapor-deposited portions 21 in which the aluminum nuclei 20 have grown with time is small, and the island density is low. Therefore, as shown in FIG. 3, the millimeter wave transmission attenuation amount satisfies the condition of 2 dB or less, but good metallic luster cannot be obtained.

IIの速度範囲では、アルミニウムの核20が隣同士が接触しない程度に密に形成されるため、アルミニウムの核20が時間とともに成長した島状のアルミニウム蒸着部21の数が多く、島密度が高くなる。そのために、図3に示すように、ミリ波透過減衰量は2dB以下の条件と良好な金属光沢の双方を満足する。   In the speed range of II, the aluminum nuclei 20 are formed so densely that the adjacent ones do not contact each other. Therefore, the number of island-like aluminum vapor-deposited portions 21 in which the aluminum nuclei 20 grow with time is large, and the island density is high. Become. Therefore, as shown in FIG. 3, the millimeter wave transmission attenuation satisfies both the condition of 2 dB or less and a good metallic luster.

IIIの速度範囲では、アルミニウムの核20の数が多くなり、隣同士が接触、または、形成された核の上に新たに核が形成されるなどして、複数の核が接着して1つとなって、島状のアルミニウム蒸着部21を形成したり、アルミニウムの核20が成長した島状のアルミニウム蒸着部21同士が接触して1つとなったりすることにより、島状のアルミニウム蒸着部21の数が減少している。そのために、島密度は低下しているが、良好な金属光沢は得られるが、図3に示すように、ミリ波透過減衰量は2dB以下の条件を満足しないものとなる。   In the speed range of III, the number of the aluminum nuclei 20 increases, the adjacent nuclei are in contact with each other, or new nuclei are formed on the formed nuclei. Thus, the island-shaped aluminum vapor-deposited portion 21 is formed, or the island-shaped aluminum vapor-deposited portions 21 on which the aluminum nuclei 20 are grown are brought into contact with each other to form one. The number is decreasing. Therefore, although the island density is reduced, good metallic luster can be obtained, but as shown in FIG. 3, the millimeter wave transmission attenuation does not satisfy the condition of 2 dB or less.

1…樹脂基材
2…装飾皮膜 20…金属(アルミニウム)の核
21…島状の金属(アルミニウム)蒸着部 22…金属(アルミニウム)非蒸着部
100…レーダ装置 101…フロントグリル 102…エンブレム
DESCRIPTION OF SYMBOLS 1 ... Resin base material 2 ... Decorative coating 20 ... Metal (aluminum) core
DESCRIPTION OF SYMBOLS 21 ... Island-like metal (aluminum) vapor deposition part 22 ... Metal (aluminum) non-vapor deposition part 100 ... Radar apparatus 101 ... Front grille 102 ... Emblem

Claims (5)

レーダ装置のレーダビーム経路内に配設させて用いられる樹脂基材の表面に、金属蒸着部が不連続に存在する装飾皮膜を形成する方法であって、
前記樹脂基材にアルミニウムを300μm/h〜500μm/hの蒸着速度で蒸着させることを特徴とする樹脂基材表面への装飾皮膜の形成方法。
A method of forming a decorative film in which metal vapor deposition portions exist discontinuously on the surface of a resin base material used by being disposed in a radar beam path of a radar device,
A method for forming a decorative film on the surface of a resin substrate, comprising depositing aluminum on the resin substrate at a deposition rate of 300 μm / h to 500 μm / h.
レーダ装置のレーダビーム経路内に配設させて用いられる樹脂基材の表面に、金属蒸着部が不連続に存在する装飾皮膜を形成する方法であって、
前記樹脂基材にアルミニウムを300μm/h〜450μm/hの蒸着速度で蒸着させることを特徴とする請求項1記載の樹脂基材表面への装飾皮膜の形成方法。
A method of forming a decorative film in which metal vapor deposition portions exist discontinuously on the surface of a resin base material used by being disposed in a radar beam path of a radar device,
2. The method for forming a decorative film on the surface of a resin substrate according to claim 1, wherein aluminum is deposited on the resin substrate at a deposition rate of 300 [mu] m / h to 450 [mu] m / h.
装飾皮膜を形成する金属蒸着部の厚さが1〜5μmとなるようにアルミニウムの蒸着処理を行うことを特徴とする請求項1又は2記載の樹脂基材表面への装飾皮膜の形成方法。   The method for forming a decorative coating on the surface of a resin substrate according to claim 1 or 2, wherein the vapor deposition treatment of aluminum is performed so that the thickness of the metal vapor deposition portion for forming the decorative coating is 1 to 5 µm. 請求項1ないし3のいずれか一項に記載の形成方法で形成された装飾皮膜を有する外装装飾部材。   An exterior decorative member having a decorative film formed by the forming method according to any one of claims 1 to 3. 樹脂基材表面に島状のアルミニウム蒸着部が不連続に存在する装飾皮膜を有する、レーダ装置のレーダビーム経路内に配設される外装装飾部材であって、
装飾皮膜を形成する金属蒸着部の厚さが1〜5μmであり、島状に蒸着されたアルミニウム蒸着部が前記樹脂基材に占める密度(島密度)が40個/μm以上であり、ミリ波透過減衰量が2dB以下であることを特徴とする外装装飾部材。
An exterior decorative member disposed in a radar beam path of a radar device having a decorative coating in which island-shaped aluminum vapor deposition portions exist discontinuously on the resin base material surface,
The thickness of the metal vapor deposition part that forms the decorative film is 1 to 5 μm, and the density (island density) of the aluminum vapor deposition part deposited in an island shape in the resin base material is 40 pieces / μm 2 or more, An exterior decorative member having a wave transmission attenuation of 2 dB or less.
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WO2019230955A1 (en) * 2018-06-01 2019-12-05 大日本印刷株式会社 Metallic decorative member, and metallic decorative molded body using same
JPWO2019230955A1 (en) * 2018-06-01 2021-07-29 大日本印刷株式会社 Metal-like decoration member and metal-like decoration molded body using it
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WO2021132456A1 (en) * 2019-12-26 2021-07-01 大日本印刷株式会社 Metallic decorative sheet and metallic decorative molded body provided with same
WO2021132461A1 (en) * 2019-12-27 2021-07-01 大日本印刷株式会社 Metal tone decorative sheet and metal tone decorative molded body provided with metal tone decorative sheet

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