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:
Jan. 02, 2007
Filed:
Feb. 06, 2004
Yasuhiro Kondo, Nagoya, JP;
Yasuhiro Kondo, Nagoya, JP;
Elmo Company, Limited, , JP;
Abstract
A reflective-type infrared ray cut filter and associated manufacturing method wherein the time and cost of manufacture are reduced and manufacturing efficiency is improved are provided. In the infrared ray cut filtercomprising a multilayer membranecomposed of no less than 16 but no more than 32 layers of a high-refractive index thin membraneand a low-refractive index thin membranelaminated in an alternating fashion and formed on a glass substrate, the first layer from the side of the glass substrateis a high-refractive index thin membraneand the last layer is a low-refractive index thin membrane, and where the design wavelength is deemed λ, the first and second layers are formed to have an optical thickness of no less than λ/4, the third layer through a prescribed layer are formed to have an optical thickness of no more than λ/4, the layers between the prescribed layer and the last layer are formed to have an optical thickness of no less than λ/4, and the last layer is formed to have an optical thickness of no more than λ/4.