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. 26, 1998
Filed:
Nov. 04, 1996
Applicant:
Inventors:
Bao Xue Chen, Yokohama, JP;
Michiya Masuda, Yokohama, JP;
Assignee:
NHK Spring Co., Ltd., Yokohama, JP;
Primary Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
385 45 ; 385 14 ; 385 43 ; 385 50 ; 385132 ;
Abstract
A transition waveguide is provided between one main waveguide and two branching waveguides. The transition waveguide includes a stepped portion, of which the waveguide width suddenly slightly spreads stepwise with respect to the distal end portion of the main waveguide, and an extension portion extending from the stepped portion toward the branching waveguides. The waveguide width of the extension portion is substantially fixed or gradually increased in a region ranging from the stepped portion to the branching waveguides.