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:
Aug. 22, 2000
Filed:
Aug. 12, 1998
Kimihiro Kikuchi, Miyagi-ken, JP;
Yoshihiro Someno, Miyagi-ken, JP;
Atsunori Hattori, Miyagi-ken, JP;
Shoichi Kyoya, Miyagi-ken, JP;
Alps Electric Co., Ltd., , JP;
Abstract
A dielectric multilayer film which has a bandpass characteristic in which a light beam having a wavelength .lambda.2 passes and a light beam having any of the other wavelengths is blocked is formed on the emergent-side surface of a lens provided near a light-receiving device which receives a light beam having the wavelength .lambda.2. A dielectric multilayer film which has a bandpass characteristic in which a light beam having a wavelength .lambda.1 passes and a light beam having any of the other wavelengths is blocked is formed on the emergent-side surface of a lens provided near another light-receiving device which receives a light beam having the wavelength .lambda.1.