Lens for rearview mirror

• US 20070053085A1
• Filed: 12/02/2005
• Published: 03/08/2007
• Est. Priority Date: 09/06/2005
• Status: Active Grant

• Current Assignee: Mobiletron Electronics Co. Ltd.
• Original Assignee: Mobiletron Electronics Co. Ltd.
• Inventors: Shih, Kai-Tsung
• Granted Patent: US 7,232,231 B2
• Time in Patent Office: Days
• US Class Current: 359/839
• CPC Class Codes: B60R 1/12 Mirror assemblies combined with other articles, e.g. clocks
• CPC Class Codes: B60R 2001/1253 with cameras, video cameras or video screens

Abstract

A lens for a vehicle rearview mirror includes a light-transmissible glass substrate, which has a first surface and a second surface opposite to the first surface, a first coating layer, which has a reflectivity of 10-20% and is coated on the first surface of the glass substrate and defines with the first surface of the glass substrate a first transmission zone, a second coating layer, which has a reflectivity of 40-55% and is coated on the whole area of the second surface of the glass substrate, and a back layer, which is covered on the second coating layer and defines with the second coating layer a second transmission zone corresponding to the first transmission zone.

Claims

1. A lens for a vehicle rearview mirror comprising:

a glass substrate admitting light and having a first surface and a second surface opposite to said first surface;

a first coating layer coated on the first surface of said glass substrate and defining with the first surface of said glass substrate a first transmission zone that is not covered by said first coating layer, said first coating layer having a reflectivity of 10-20%;

a second coating layer coated on the whore area of the second surface of said glass substrate, said second coating layer having a reflectivity of 40-55%; and

a back layer covered on said second coating layer and defining with said second coating layer a second transmission zone that is not covered by the back layer and corresponds in location to said first transmission zone.

2. The lens as claimed in claim 1, wherein the reflectivity counted from said first transmission zone to said second transmission zone is 45-60%.

3. The lens as claimed in claim 1, wherein the reflectivity counted from said first coating layer to said back layer is 50-75%.

4. The lens as claimed in claim 1, wherein said first coating layer is prepared from titanium dioxide.

5. The lens as claimed in claim 1, wherein said first coating layer is prepared from silicon dioxide.

6. The lens as claimed in claim 1, wherein said second coating layer is prepared from titanium dioxide.

7. The lens as claimed in claim 1, wherein said second coating layer is prepared from silicon dioxide.

8. The lens as claimed in claim 1, wherein said first coating layer and said second coating layer are respectively added with a predetermined amount of trace elements.

9. The lens as claimed in claim 1, further comprising an anti-scraping coating layer that admits light and is coated on said first coating layer for protection against scraping.

10. The lens as claimed in claim 1, further comprising an anti-knocking coating layer that admits light and is coated on said back layer to prevent said glass substrate from scattering upon an impact.