Highly reflective plastic reflector with crystalline inorganic film coating

• US 4,364,637 A
• Filed: 06/13/1979
• Issued: 12/21/1982
• Est. Priority Date: 06/13/1978
• Status: Expired due to Term

• Current Assignee: NHK Spring Company Limited 1 Shinisogocho Isogo-Ku Yokohama-Shi Kanagawa Japan A Body Corporation of Japan, Yokohama KIKO Company Limited 12 Yatsu-Cho Kanazawa-Ku Yokohama-Shi Kanagawa Japan
• Original Assignee: NHK Spring Company Limited, Yokohama KIKO Company Limited (NHK Spring Company Limited)
• Inventors: Ohno, Akira, Katayama, Shitomi, Senaha, Susumu, Akagami, Akira, Kyo, Suizo
• Primary Examiner(s): Henry, Jon W.
• Application Number:
  US06/048,312
• Time in Patent Office: 1,287 Days
• Field of Search: 350/288, 350/299, 350/303, 427/162, 427/294, 427/248 J, 427/250, 427/296, 427/164, 260/37 PC, 260/39, 260/39 SB, 428/433
• US Class Current: 359/884
• CPC Class Codes: G02B 5/0858 the reflecting layers comprising a single metallic layer with one or more dielectric layers

Abstract

The present invention relates to a plastic reflector having high reflective properties and the method of preparing the same. The reflector is obtained by disposing a reflective film in which a light-reflective metal is coated by a vacuum coating method on one or all sides of a molded body made of polymeric materials or the derivative thereof and further by disposing a light-transmissible coated film in which an inorganic substance selected from metallic oxides and oxides of amphoteric elements or a derivative thereof is vacuum coated on the reflective film.

Claims

1. A reflector comprising a light-reflecting metallic film vacuum coated on one or more sides of a molded body of polymeric material or a composite thereof, with the surface of said body formed of a thermosetting resin devoid of volatile components, and a light-transmissible crystalline film of an inorganic material selected from the group consisting of a metal oxide, an oxide of an amphoteric element and a mixture thereof vacuum coated on said light-reflecting metallic film.

2. The reflector as set forth in claim 1, in which said polymeric material is selected from the group consisting of a volatile matter-free thermosetting resin and a mixture thereof, with one or more of a reinforcing filler, a flame retardant and a self fire-extinguishing agent, which are free of volatile components under a vacuum.

3. The reflector as set forth in claim 2, wherein said thermosetting resin is a polycarbonate resin, a polyester resin, a phenol resin, a urea resin, a furfural resin, an allyl resin, an epoxy resin, a silicone resin, a borosilicone resin and a carbosilicone resin;

and said reinforcing filler is glass fiber, mica, or asbestos.

4. The reflector as set forth in claim 1, in which said light-reflecting metallic film is a film of a colorless light-reflecting metal selected from the group consisting of aluminum, silver, chromium, nickel, platinum and alloys thereof;

a colored light-reflective metal or metallic compound selected from the group consisting of copper, gold, alloys thereof and nitrides thereof, brass, and nitrides of titanium.

5. The reflector as set forth in claim 1, in which said metal oxide is a crystallized quartz;

a metal oxide ceramic selected from the group consisting of magnesia, alumina, and zirconia;

spinel;

a cordierite ceramic;

or a lithia ceramic.

6. The reflector as set forth in claim 1, wherein the thickness of the light-reflecting metal film is several thousand Angstroms to 1 micron and the thickness of the light-transmissible film is several thousand Angstroms to 4 microns.