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:
Jun. 17, 2014
Filed:
Aug. 25, 2006
Takayuki Wakabayashi, Chichibu, JP;
Masayuki Uchiyama, Honjo, JP;
Yasunori Saito, Honjo, JP;
Michio Yanagi, Chichibu, JP;
Takayuki Wakabayashi, Chichibu, JP;
Masayuki Uchiyama, Honjo, JP;
Yasunori Saito, Honjo, JP;
Michio Yanagi, Chichibu, JP;
Abstract
An ND filter that enables relatively easy control of light quantity when used in an iris device and realizes excellent optical performance. The ND filter has a first region having an ND film with a uniform density, a second region having an ND film with a uniform density different from the density of the first region, and a density transition region provided between the first region and the second region. The density transition region has an ND film whose density changes continuously from the density of the first region to the density of the second region.