Patent ID: 7929225

Claim:
A lens assembly comprising: a plurality of lenses; a lens frame having a hollow part which includes an opening on each of an object side and an image forming side of the lens assembly and into which the plurality of lenses are inserted with their optical axes aligned; a first coating film provided on an image forming side surface of a first lens that is located nearest to the object side among the plurality of lenses inserted into the hollow part, the first coating film being more hydrophilic than that of a base body of the first lens; a second coating film provided on an object side surface of a second lens that is located adjacent to and on the image forming side of the first lens, the second coating film being more hydrophilic than that of a base body of the second lens; wherein surfaces of lenses located in the image forming surface side equal to or after an image forming surface side of the second lens do not have hydrophilic coating films.