Coatings on glass

• US 5,764,415 A
• Filed: 01/09/1995
• Issued: 06/09/1998
• Est. Priority Date: 01/10/1994
• Status: Expired due to Fees

• Current Assignee: Libbey-Owens-Ford Co. (Eaton Corporation PLC.), Pilkington NA
• Original Assignee: Libbey-Owens-Ford Co. (Eaton Corporation PLC.), Pilkington NA
• Inventors: Nelson, Douglas M., Jenkinson, Timothy
• Primary Examiner(s): Shafer, Ricky D.
• Application Number:
  US08/370,418
• Time in Patent Office: 1,247 Days
• Field of Search: 359/584, 359/585, 359/589, 359/586, 359/588, 359/603, 359/883, 359/884, 359/900, 427/165, 427/166, 427/167, 427/225.7, 427/419.2, 427/419.3, 65/60.1, 65/60.2, 65/60.5, 65/60.8, 65/95
• US Class Current: 359/584
• CPC Class Codes: C03C 17/3411 with at least two coatings of inorganic materials C03C17/36, C03C17/42 take precedence
• CPC Class Codes: C03C 17/3482 comprising silicon, hydrogenated silicon or a silicide
• CPC Class Codes: G02B 5/0833 comprising inorganic materials only
• CPC Class Codes: Y10S 359/90 Methods

Abstract

A method of producing front surface mirrors comprising depositing onto a hot ribbon of low transmissivity glass during the production process a low transmissivity reflecting coating whereby the mirrors have a transmissivity through the coated glass of up to about 10% in visible light. There is also provided a front surface mirror comprising a glass substrate of low transmissivity glass carrying a low transmissivity reflecting coating whereby the mirror has a transmissivity through the coated glass of up to about 10% in visible light.

Claims

1. A method of producing front surface mirrors having a front surface visible light reflection of at least 70% comprising producing a hot ribbon of glass having a transmissivity of up to 60% in visible light and depositing onto the hot ribbon of glass during the glass production process a reflecting coating with a transmission of 1 to 15% in visible light whereby the mirrors have a transmissivity through the coated glass of up to about 10% in visible light.

2. A method according to claim 1 wherein the mirrors are for use as one way mirrors and have a reflection on the back face thereof of less than around 20% in visible light.

3. A method according to claim 1 wherein the reflecting coating comprises a reflecting layer and at least two reflection enhancing layers.

4. A method according to claim 3 wherein the reflection enhancing layers comprise an intermediate layer of the coating of relatively low refractive index and a layer adjacent to the intermediate layer of relatively high refractive index.

5. A method according to claim 4 wherein the reflecting layer comprises a layer adjacent to the intermediate layer of relatively high refractive index.

6. A method according to claim 5 wherein at least one of the relatively high refractive index layers is of silicon.

7. A method according to claim 6 wherein both of the relatively high refractive index layers are of silicon.

8. A method according to claim 6 wherein the other of the said layers of relatively high refractive index is of tin oxide, titanium oxide or a silicon oxide.

9. A method according to claim 4 wherein the layer of relatively low refractive index comprises a layer of silicon oxide.

10. A method according to claim 1 wherein the reflecting coating is deposited onto the hot ribbon of glass during a tint change in the glass production process.