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:
Nov. 16, 2004
Filed:
Apr. 28, 2003
Two-wavelength antireflection film and objective lens coated with two-wavelength antireflection film
Tadashi Watanabe, Kamiina-gun, JP;
Hideto Yamashita, Kamiina-gun, JP;
Masato Kohsaka, Komagane, JP;
Takao Yamauchi, Ina, JP;
Kiyonobu Kurata, Hachioji, JP;
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
A two-wavelength antireflection film to prevent light in two-wavelength regions of a deep-ultraviolet region and a region from a visible region to the near-infrared region on a surface of a substrate by coating the two-wavelength antireflection film on the surface of the substrate which penetrates light from the deep-ultraviolet region to the near-infrared region, comprising a first thin film which is formed on the substrate, and has a refractive index of 1.6 to 2.0 and optical film thickness of 0.4&lgr; to 0.7&lgr; for design main wavelength (&lgr;), a second thin film which is formed on the first thin film, and has a refractive index of 1.35 to 1.55 and an optical film thickness of 0.05&lgr; to 0.6&lgr; for the design main wavelength &lgr;, a third thin film which is formed on the second thin film, and has a refractive index of 1.6 to 2.0 and an optical film thickness of 0.1&lgr; to 0.5&lgr; for the design main wavelength &lgr;, and a fourth thin film which is formed on the third thin film, and has a refractive index of 1.35 to 1.55 and an optical film thickness of 0.2&lgr; to 0.35&lgr; for the design main wavelength &lgr;.