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:
Mar. 04, 2014
Filed:
Aug. 30, 2007
Masayuki Uchiyama, Honjo, JP;
Munetoshi Yoshikawa, Chichibu, JP;
Kazuo Suzuki, Chichibu, JP;
Takayuki Wakabayashi, Chichibu, JP;
Masayuki Uchiyama, Honjo, JP;
Munetoshi Yoshikawa, Chichibu, JP;
Kazuo Suzuki, Chichibu, JP;
Takayuki Wakabayashi, Chichibu, JP;
Canon Denshi Kabushiki Kaisha, Saitama, JP;
Abstract
A spectral reflectance in the entire visible wavelength range may be decreased to decrease inconveniences in an image such as flare or ghost. A non-reflective periodic layer including a large number of fine uneven periodic structure bodies is formed on a substrate, and a neutral density ('ND') film is formed on the other surface of the substrate by vacuum deposition, to improve an anti-reflection function. Regarding a beam entering the ND filter, the MgFfilm of the formed ND film suppresses the spectral reflectance at the boundary of the atmosphere and the ND film and at the boundary of the ND film and the substrate. The non-reflective periodic layer decreases the reflectance at the boundary of the substrate and the atmosphere.