Transparent member, imaging apparatus, and method of producing transparent member
AssigneeCanon Kabushiki Kaisha
InventorYo Watanabe
Life of this patent
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Abstract
The present disclosure provides a transparent member having a highly reliable hydrophilic film formed thereon which can maintain hydrophilicity for a long period of time, even when a product is packed and stored and when the product is exposed to an outdoor environment, wherein the transparent member is a transparent member including a substrate, a porous layer and a hydrophilic polymer layer in this order, wherein the porous layer contains a silica particle and a binder, and the hydrophilic polymer layer contains a polymer having a zwitterionic hydrophilic group having a layer thickness of 1 nm or larger and 20 nm or smaller.
Claims19
A transparent member comprising a substrate, a porous layer and a hydrophilic polymer layer, in this order, wherein
- the porous layer contains a silica particle and a binder;
- and the hydrophilic polymer layer contains a polymer having a zwitterionic hydrophilic group having a layer thickness of 1 nm or larger and 20 nm or smaller.
An imaging apparatus comprising an optical system and an image sensor which acquires a video via the optical system in a space surrounded by a housing and a transparent member, wherein
- the transparent member comprises a porous layer and a hydrophilic polymer layer from the transparent member side in this order, on a surface in an outer side;
- the porous layer contains a silica particle and a binder, and
- the hydrophilic polymer layer contains a polymer having a zwitterionic hydrophilic group having a layer thickness of 1 nm or larger and 20 nm or smaller.
A method of producing a transparent member comprising a substrate, a porous layer and a hydrophilic polymer layer, in this order, the method comprising:
- applying a dispersion liquid containing a silica particle and a binder component onto a substrate, and curing the dispersion liquid to form the porous layer;
- and
- applying a solution containing a hydrophilic polymer having a zwitterionic hydrophilic group onto the porous layer, and curing the solution to form the hydrophilic polymer layer, the hydrophilic polymer layer having a layer thickness of 1 nm or larger and 20 nm or smaller.
Dependencies are inferred from the claim text.