The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 15, 1992
Filed:
Jun. 22, 1990
Toshiaki Ogura, Hirakata, JP;
Nahoko Shimamura, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
An anti-reflection film to be used for a plastic optical component is excellent in adhesion, durability and optical characteristic as well as be suited for mass-production. The anti-reflection film is a three-layered structure comprising, from the surface of the optical component on which it is formed, a first layer and a second layer which are made of a same dielectric material and a third layer which is a different dielectric material therefrom. Oxygen is introduced when the first layer is formed in order to provide the first layer smaller in refractive index than the second layer. The first and second layers are each made of any of cerium oxide, tantalum pentoxide and hafnium oxide and the third layer is made of silicon dioxide.