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:
Dec. 28, 2004
Filed:
Oct. 22, 2001
Yao-Hao Chang, Chung-Ho, TW;
Hon Hai Precision Ind. Co., Ltd., Taipei Hsien, TW;
Abstract
An electrical variable optical attenuator ( ) of the present invention has a housing ( ), a cover ( ), an attenuating means ( ), an optical module ( ), an electrical driving element ( ), an input fiber ( ) and an output fiber ( ). The attenuating means includes a carrier ( ) having a guide groove ( ) and an inner screw ( ). A filter ( ) is fixed on the carrier. The optical module includes a guide pole ( ). The electrical driving element has a screw rod ( ), which couples with the inner screw. The attenuating means is assembled inside the optical module with the guide pole being received in the guide groove to confine the direction of movement of the carrier along the screw rod, thus helping to avoid trembling of the filter when the screw rod is rotated.