Metallic lustrous member with radio wave transmissibility, article using same, and production method therefor
A metallic lustrous member with radio wave transmissibility is provided, which is capable of being easily produced, while ensuring a structure in which not only chromium or indium but also any of some other metals such as aluminum is formed as a metal layer on a continuous surface of any of various materials, and also an article using the member is provided. A production method for a metallic lustrous member with radio wave transmissibility, which is capable of easily forming, as a metal layer, not only chromium or indium but also any of some other metals such as aluminum, on a continuous surface of any of various materials. The metallic lustrous member comprises a substrate having radio wave transmissibility, and an aluminum layer formed directly on a continuous surface of the substrate. The aluminum layer has a discontinuous region including a plurality of separated segments which are mutually discontinuous.
1. A metallic lustrous member with radio wave transmissibility, comprising:
a substrate having radio wave transmissibility;
a continuous indium oxide-containing layer on a surface of the substrate; and
an aluminum layer formed directly on the continuous indium oxide-containing layer on the surface of the substrate wherein
the aluminum layer is formed by alternating current (AC) sputtering and has a discontinuous region including that includes a plurality of separated segments which are in a discontinuous state on the continuous indium oxide-containing layer, and
the aluminum layer has a radio wave transmission attenuation amount of 10 dB or less.
2. The metallic lustrous member as recited in claim 1 , wherein the aluminum layer has a sheet resistance of 90Ω/□ or more.
3. The metallic lustrous member as recited in claim 1 , wherein the substrate is one selected from the group consisting of a film, a resin molded product, a glass product, and an article itself to be imparted with metallic luster.
4. The metallic lustrous member as recited in claim 1 , wherein the aluminum layer has a maximum thickness of 15 to 80 nm.
5. The metallic lustrous member as recited in claim 1 , wherein the aluminum layer is one of aluminum (Al) and an aluminum (Al) alloy.
6. The metallic lustrous member as recited in claim 5 , wherein a content ratio of aluminum to an entire metal component in the aluminum (Al) alloy is 50% or more.
7. The metallic lustrous member as recited in claim 1 , wherein the aluminum layer is provided on an inner surface of a transparent housing formed using the continuous surface of the substrate.
8. An article using the metallic lustrous member as recited in claim 1 .
9. The article as recited in claim 8 , which is a communication device.
10. A production method for a metallic lustrous member with radio wave transmissibility, or an article using the metallic lustrous member, the method comprising:
forming a continuous indium oxide-containing layer on a surface of a substrate having radio wave transmissibility;
forming an aluminum layer directly on the continuous indium oxide-containing layer on the surface of the substrate by alternating current (AC) sputtering,
wherein the aluminum layer is formed having a discontinuous region that includes a plurality of separated segments which are in a discontinuous state on the continuous indium oxide-containing layer, and wherein the aluminum layer has radio wave transmission attenuation amount of 10 dB or less.
11. The production method as recited in claim 10 , wherein the AC sputtering is performed under a pressure of 1.5 Pa or more.
12. The production method as recited in claim 10 , wherein, during the AC sputtering, the substrate has a temperature of 20° C. or more.