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:
May. 28, 2002
Filed:
Sep. 01, 2000
Minoru Otani, Tokyo, JP;
Kenji Ando, Kawasaki, JP;
Yasuyuki Suzuki, Yokohama, JP;
Ryuji Biro, Kawasaki, JP;
Hidehiro Kanazawa, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
The antireflection film of the present invention comprises an alternately multi-layered film of 10 layers formed on a base member and having antireflection characteristics in two wavelength regions including a first wavelength (&lgr; ) of 248 nm and a second wavelength (&lgr; ) of 633 nm as central wavelengths, respectively, the multi-layered film of 10 layers comprising: low-refractive index layers arranged at odd-numbered positions from a side opposite to the base member and having a refractive index of 1.45 to 1.52 at the first wavelength (&lgr; ); and high-refractive index layers arranged at even-numbered positions from the side opposite to the base member and having a refractive index of 1.65 to 1.80 at the first wavelength (&lgr; ), wherein layers arranged at the first, second and third positions from the side opposite to the base member each have an optical thickness ranging from 0.21&lgr; to 0.28&lgr; .