Electroconductive antireflection film

• US 5,667,880 A
• Filed: 05/24/1995
• Issued: 09/16/1997
• Est. Priority Date: 07/20/1992
• Status: Expired due to Fees

• Current Assignee: Fuji Photo Optical Co. Ltd (Fujifilm Holdings Corporation)
• Original Assignee: Fuji Photo Optical Co. Ltd (Fujifilm Holdings Corporation)
• Inventors: Okaniwa, Masayuki
• Primary Examiner(s): RYAN, PATRICK J
• Application Number:
  US08/449,804
• Time in Patent Office: 846 Days
• Field of Search: 428/212, 428/688, 428/689, 428/34.4, 428/918, 428/702, 428/704, 428/216, 428/213, 428/426, 428/432, 359/359, 359/585, 359/586, 359/589, 359/885
• US Class Current: 428/212
• CPC Class Codes: C03C 17/3417 all coatings being oxide coatings
• CPC Class Codes: C03C 2217/734 comprising an alternation of high and low refractive indexes
• CPC Class Codes: G02B 1/116 including electrically conducting layers
• CPC Class Codes: Y10S 428/918 Material abnormally transparent
• CPC Class Codes: Y10T 428/24942 including components having same physical characteristic in differing degree
• CPC Class Codes: Y10T 428/2495 Thickness [relative or absolute]
• CPC Class Codes: Y10T 428/24975 No layer or component greater than 5 mils thick

Abstract

An electroconductive antireflection film with a laminated structure is composed of at least four oxide layers, including a plurality of high-refractive-index layers and a plurality of low-refractive-index layers, at least one of the high-refractive-index layers serving as a transparent electroconductive layer and one of the low-refractive-index layers serving as a surface layer.

Claims

1. An electroconductive antireflection film having a laminated structure, comprising:

a substrate,

a transparent electroconductive layer comprising indium tin oxide disposed adjacent the substrate,

at least two first oxide layers having a refractive index within a first range,

at least two second oxide layers having a refractive index within a second range, the second range being lower than the first range,

the at least two first oxide layers and the at least two second oxide layers comprising oxide layers prepared by a sputtering method and being disposed in an alternating arrangement,

at least one of the two first oxide layers comprising titanium oxide disposed adjacent the transparent electron conductive layer,

at least one of the two second oxide layers comprising silicon oxide disposed adjacent the at least one of the two first oxide layers comprising titanium oxide, and

at least one of the at least two second oxide layers comprising a surface layer of the electroconductive antireflection film.

2. The film of claim 1, wherein the first range is between about 1.8 and about 2.9 and the second range is between about 1.40 and about 1.55.

3. The film of claim 1, comprising a ground electrode provided on the surface layer, wherein the transparent electroconductive layer is electrically connected via the surface layer to the ground electrode.