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:
Jan. 27, 2004
Filed:
Dec. 24, 2001
Yao-Hao Chang, Tu-Chen, TW;
Hon Hai Precision Ind. Co., Ltd., Taipei Hsien, TW;
Abstract
A manual variable optical attenuator ( ) includes a base ( ), a cover ( ), an optical module ( ), a shifting device ( ), and an optical fiber retainer ( ). The optical module comprises a mirror ( ), a frame ( ), a dual optical fiber collimator ( ), a stopper ( ), a graded transmittance filter ( ), and a filter carrier ( ). The shifting device comprises a screw pole ( ), a first holder ( ), and a second holder ( ). The screw pole comprises a terminal portion ( ) rotatably received in the first holder, a first annular groove ( ) accommodating the second holder, a second annular groove ( ) receiving a gasket ( ), an adjusting slot ( ), and a screw thread ( ). The gasket protrudes from a circumferential surface of the screw pole and seals a gap between the screw pole and a sidewall ( ) of the cover. External harmful contamination cannot penetrate into the attenuator.