Transparent conductive laminate film, touch panel having this transparent conductive laminate film, and production method for this transparent conductive laminate film

• US 7,521,123 B2
• Filed: 05/23/2003
• Issued: 04/21/2009
• Est. Priority Date: 05/23/2002
• Status: Expired due to Fees

• Current Assignee: NOF Corporation
• Original Assignee: NOF Corporation
• Inventors: Hattori, Naohito, Yoshioka, Kensuke
• Primary Examiner(s): Speer; Timothy M
• Application Number:
  US10/514,189
• Publication Number:
  US 20050170158A1
• Time in Patent Office: 2,160 Days
• Field of Search: None
• US Class Current: 428/428
• CPC Class Codes: B32B 7/00 Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
• CPC Class Codes: G06F 1/1692 the I/O peripheral being a secondary touch screen used as control interface, e.g. virtual buttons or sliders
• CPC Class Codes: Y10T 428/24942 including components having same physical characteristic in differing degree
• CPC Class Codes: Y10T 428/24975 No layer or component greater than 5 mils thick
• CPC Class Codes: Y10T 428/266 of base or substrate
• CPC Class Codes: Y10T 428/31616 Next to polyester [e.g., alkyd]
• CPC Class Codes: Y10T 428/31678 Of metal

Abstract

A touch panel-use transparent conductive laminate film little in coloring of transmitted beam and high in transmittance. The transparent conductive laminate film (100) comprises an intermediate layer (B) laminated on a transparent substrate(A) and having an optical film thickness of 100-175 nm, and a conductive layer (C) having an optical film thickness of 10-60 nm, the refractive index of the intermediate layer being between that of the substrate and that of the conductive layer at 1.7-1.85.

Claims

1. A transparent conductive laminate film comprising:

a light transmitting substrate;

an intermediate layer laminated on one or both surfaces of the substrate directly or indirectly via at least one layer and having an optical thickness of 100 to 175 nm; and

a conductive layer laminated on the intermediate layer and having an optical thickness of 10 to 60 nm, wherein the intermediate layer has a refractive index of 1.7 to 1.85, and wherein the refractive index of the light transmitting substrate is less than the refractive index of the intermediate layer, and the refractive index of conductive layer is greater than the refractive index of the intermediate layer (refractive index of substrate<

refractive index of intermediate layer<

refractive index of conductive layer).

2. The transparent conductive laminate film according to claim 1, wherein the conductive layer is made of a metal or a metal oxide.

3. The transparent conductive laminate film according to claim 1, wherein the conductive layer contains indium tin oxide.

4. The transparent conductive laminate film according to claim 1, wherein the substrate is a plastic film having a thickness of 10 to 500 nm.

5. The transparent conductive laminate film according to claim 1, which has a first surface located closer to the conductive layer, wherein the first surface has a local minimum reflectance wavelength within the range of 380 to 500 nm.

6. The transparent conductive laminate film according to claim 5, wherein the first surface has a local minimum reflectance wavelength within the range of 450 to 500 nm.

7. The transparent conductive laminate film according to claim 1, which has a transmitted color difference of −

2<

a*<

2 and −

2<

b*<

2 in a L*a*b color system.

8. The transparent conductive laminate film according to claim 1, wherein the conductive layer is in contact with the intermediate layer and the substrate.

9. The transparent conductive laminate film according to claim 1, wherein the intermediate layer is a mixture of an inorganic substance and an organic substance.

10. The transparent conductive laminate film according to claim 9, wherein the intermediate layer is a cured product of a mixture of a metal oxide and a curable monomer.

11. The transparent conductive laminate film according to claim 10, wherein the curable monomer is an ultraviolet-curable monomer.

12. A touch panel comprising:

electrode substrates faced with each other; and

a transparent conductive laminate film laminated above the electrode substrates, wherein the transparent conductive laminate film includes a light transmitting substrate, an intermediate layer laminated on one or both surfaces of the substrate directly or indirectly via at least one layer and having an optical thickness of 100 to 175 nm, and a conductive layer laminated on the intermediate layer and having an optical thickness of 10 to 60 nm, wherein the intermediate layer has a refractive index of 1.7 to 1.85, and wherein the refractive index of the light transmitting substrate is less than the refractive index of the intermediate layer, and the refractive index of the conductive layer is greater than the refractive index of the intermediate layer (refractive index of substrate<

refractive index of intermediate layer<

refractive index of conductive layer).