1. Technical Field
The present disclosure relates to a film structure and a portable electronic device employing the film structure.
2. Description of Related Art
Antennas are accommodated in the shells of many cell phones. The human body is a conductor, because of this, if the shell is made of metal, the metallic shell is grounded via the user when the cell phone is being held. In this case, the metallic shell may block the radio waves, generating a weak signal from the cell phone.
Therefore, it is desirable to provide a film structure and a portable electronic device, which can overcome the above-mentioned limitations.
Referring to
The metal substrate 12 may be made of pure metal, such as copper, chromium, gold, or silver. The metal substrate 12 may also be made of alloy, for example, stainless steel, or aluminum alloy. In the present embodiment, the metal substrate 12 is made of stainless steel SUB 304.
The metal film 14 is made of pure metal, such as, aluminum, copper, chromium, gold, or silver. The metal film 14 may be formed by sputtering. A thickness of the metal film may be in an approximate range from about 2 nm to about 7 nm.
The optical film 16 is made of transparent insulating material, such as titanium dioxide, tantalum pentoxide, niobium pentoxide, silicon dioxide, aluminum oxide, or zirconium dioxide. In the present embodiment, the optical film is made of silicon dioxide. The optical film 16 may be formed by sputtering. A thickness of the optical film may be in an approximate range from about 2100 nm to about 2300 nm.
The metal film 14 eliminates an interference color of the optical film 16 caused by thin-film interference. That is, the thicknesses of the metal film 14 and the optical film 16 are adjusted based on the thin-film interference so that the color of the film structure 10 is substantially the same as the metal substrate 12.
In the present embodiment, a Lab color of the metal substrate 12 is (85.75, 2.67, 6.5), and the thickness of the metal substrate 12 is about 2200 nm. The thickness of the metal film 14 is about 3 nm. The thickness of the optical film 16 is about 2200 nm. The Lab color of the film structure 10 is (85.37, 2.65, 6.57). The color of the film structure 10 is substantially the same as the metal substrate 12.
Referring to
In the present embodiment, because the optical film 16 is insulating, the metal substrate 12 will not block radio waves when the user holds the portable electronic device 20. Since the metal film eliminates the interference color of the optical film 16, the shell 22 has a metallic appearance.
While various embodiments have been described, it is to be understood that the disclosure is not limited thereto. To the contrary, various modifications and similar arrangements (as would be apparent to those skilled in the art), are also intended to be covered. Therefore, the scope of the appended claims should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements.
Number | Date | Country | Kind |
---|---|---|---|
99142476 | Dec 2010 | TW | national |