DEFOGGING FILM ON OPTICAL SUBSTRATE AND METHOD FOR FORMING ITS FILM

摘要

PROBLEM TO BE SOLVED: To provide the constitution of a defogging film on various types of optical substrate having a defogging effect and an antireflecting effect.

SOLUTION: In an antireflecting film on an optical component using a plastic substrate, the material of at least first layer is constituted of a transparent film synthesized by one type or more selected from the group consisting of TiO2, SiO2, ZrO2 and Cr2O3. Its substantial film thickness is in a range of 10 to 500 Å, the second layer is constituted of the film of MgF2 or SiO2 with a central wavelength λ0and optical film thickness of a range of 1/8 to 1/2 λ0, and the third layer is constituted of the film of SiO2 or MgF2 and its film thickness of 50 to 300 Å.

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