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. 21, 2006
Filed:
May. 05, 2004
Eriko Namazue, Tokyo, JP;
Ichiro Onuki, Kanagawa, JP;
Takeshi Miyazaki, Kanagawa, JP;
Masataka Yashima, Tokyo, JP;
Akio Kashiwazaki, Kanagawa, JP;
Eriko Namazue, Tokyo, JP;
Ichiro Onuki, Kanagawa, JP;
Takeshi Miyazaki, Kanagawa, JP;
Masataka Yashima, Tokyo, JP;
Akio Kashiwazaki, Kanagawa, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An optical filter which can be manufactured at low cost and is excellent in optical characteristics is disclosed. The optical filter has a transparent substrate and a first layer which is formed on the surface of the transparent substrate. Here, the first layer has a first area which is substantially transparent and a second area which has colored ink and is light-amount adjustable, and the optical path lengths with respect to the first and the second areas are substantially equal.