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:
May. 31, 1988
Filed:
Jun. 18, 1986
Masahiko Ishida, Kyoto, JP;
Horiba, Ltd., Kyoto, JP;
Abstract
Three stacks composed of high refractive index substance layers and low refractive index substance layers, which are alternately arranged, are formed on one side of a substrate. Of the three stacks, the central stack has a number of layers which are about half the number of all the layers and each individual layer is set so as to be a desired optical quarter-wave thickness. Two stacks are arranged on opposite sides of said central stack, which stacks each have a number of layers of about 1/4 times the number of all the layers and which are set so as to be different in optical thickness from each other and different from the desired quarter wave optical thickness of the central stack layers, said stack combination being capable of easily producing a multi-layer interference filter having good spectrometic characteristics.