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:
Nov. 04, 1997
Filed:
Dec. 05, 1994
Haruhito Shimizu, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
In a variable wavelength optical filter, a glass plate has a curved surface on one or both sides thereof, and a dielectric multi-layer thin film formed on the curved surface. Light from the outside of the filter is transmitted through the film. The glass plate is movable perpendicularly to an optical axis by being driven by a piezoelectric actuator accommodated in a housing. By moving the glass plate, it is possible to control the angle of the film relative to the incident light and, therefore, the pass wavelength. The actuator positions the glass plate with accuracy, promoting extremely accurate wavelength control. The glass plate may be provided with a convexity on one side and a concavity on the other side which is complementary in configuration to the convexity. This reduces the wavelength dependency of the insertion loss by maintaining the optical axis of input light and that of output light in coindicence.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile