Touch panel

• US 20060017707A1
• Filed: 05/20/2005
• Published: 01/26/2006
• Est. Priority Date: 07/21/2004
• Status: Active Grant

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Yamaue, Nobuhiro, Takabatake, Kenichi, Fukui, Toshiharu
• Granted Patent: US 7,724,241 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact

Abstract

The invention relates to touch panels for use in a variety of electronic apparatuses, and designed to prevent separation of a lower substrate and an antireflection layer, and to ensure reliable operation. An undercoat layer (9) made of any of silicon oxide and a compound having a principal ingredient of silicon oxide is disposed between the antireflection layer (5) and the lower substrate (2) made of glass having the same principal ingredient of silicon oxide, to improve strength of adhesion between the lower substrate (2) and the antireflection layer (5), thereby preventing separation of the antireflection layer (5) from the lower substrate (5), and providing the touch panel with reliable operation.

Claims

1. A touch panel comprising:

an upper substrate having an upper conductive layer formed on one of main surfaces thereof;

a lower substrate having a lower conductive layer formed on one of main surfaces thereof in a manner to face the upper conductive layer with a predetermined space; and

an antireflection layer formed between the lower conductive layer and the lower substrate, wherein

an undercoat layer made of any of silicon oxide and a compound having a principal ingredient of silicon oxide is disposed between the antireflection layer and the lower substrate.

2. The touch panel according to claim 1, wherein the undercoat layer has a thickness of 5 to 30 nm.

3. The touch panel according to claim 2, wherein the undercoat layer has a thickness of 15 to 20 nm.

4. The touch panel according to claim 1, wherein the antireflection layer comprises a plurality of layers, each having a different refractive index.

5. The touch panel according to claim 2 further comprising another antireflection layer disposed to another main surface of the lower substrate opposite the surface where the antireflection layer and the undercoat layer are formed.