Front Surface Mirror

• US 20080253009A1
• Filed: 05/24/2006
• Published: 10/16/2008
• Est. Priority Date: 06/02/2005
• Status: Abandoned Application

• Current Assignee: Central Glass Company Limited
• Original Assignee: Central Glass Company Limited
• Inventors: Onishi, Tadashi, Kitagawa, Katsuhiko, Miyamoto, Minoru, Ueno, Yasushi
• Application Number:
  US11/910,005
• Publication Number:
  US 20080253009A1
• Time in Patent Office: Days
• US Class Current: 359/883
• CPC Class Codes: C03C 17/36 at least one coating being a metal
• CPC Class Codes: C03C 17/361 Coatings of the type glass/metal/inorganic compound/metal/inorganic compound/other
• CPC Class Codes: C03C 17/3618 Coatings of type glass/inorganic compound/other inorganic layers, at least one layer being metallic
• CPC Class Codes: C03C 17/3649 made of metals other than silver
• CPC Class Codes: C03C 17/3663 specially adapted for use as mirrors
• CPC Class Codes: C03C 2217/78 Coatings specially designed to be durable, e.g. scratch-resistant
• CPC Class Codes: C23C 14/225 Oblique incidence of vaporised material on substrate
• CPC Class Codes: G02B 5/0858 the reflecting layers comprising a single metallic layer with one or more dielectric layers
• CPC Class Codes: G03B 21/28 Reflectors in projection beam in illumination beam G03B21/2066

Abstract

In a front surface mirror used for a rear projection television, in which a metal film and a metal oxide film are formed on a glass substrate in this order, the front surface mirror being characterized in that a surface of the glass substrate is reformed by ion etching and that the metal film is an Al film.

Claims

1-4. -4. (canceled)

5. A front surface mirror used for a rear projection television, comprising:

a glass substrate having a surface reformed by ion etching;

an Al film formed on the surface of the glass substrate; and

a metal oxide film formed on the Al film.

6. A front surface mirror according to claim 5, wherein the metal oxide film comprises a first SiO₂ film formed on the Al film, and a Nb₂O₅ film formed on the first SiO₂ film.

7. A front surface mirror according to claim 5, wherein a second SiO₂ film is formed between the glass substrate and the Al film.

8. A front surface mirror according to claim 7, wherein the second SiO₂ film is formed directly on the surface of the glass substrate, and the Al film is formed directly on the second SiO₂ film.

9. A front surface mirror according to claim 5, wherein the Al film is formed directly on the surface of the glass substrate.

10. A front surface mirror according to claim 5, wherein the Al film comprises 5 wt % or less, based on the total weight of Al of the Al film, of at least one element selected from the group consisting of Mn, Mg, Si, and Nd.

11. A method for producing a front surface mirror used for a rear projection television, comprising the steps of:

(a) reforming a surface of a glass substrate by an ion etching;

(b) forming an Al film on the surface of the glass substrate; and

(c) forming a metal oxide film on the Al film.

12. A method according to claim 11, wherein the step (c) comprises the steps of:

(d) forming a first SiO₂ film on the Al film; and

(e) forming a Nb₂O₅ film on the first SiO₂ film.

13. A method according to claim 11, further comprising the step of (f) forming a second SiO₂ film directly on the surface of the glass substrate, between the steps (a) and (b).

14. A method according to claim 11, wherein the step (b) is conducted by forming the Al film directly on the surface of the glass substrate.

15. A method according to claim 11, wherein the step (b) is conducted by a sputtering to make the Al film contain 5 wt % or less, based on the total weight of Al of the Al film, of at least one element selected from the group consisting of Mn, Mg, Si, and Nd.