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:
Jun. 14, 1994
Filed:
Apr. 02, 1992
Seikoh Giken Co., Ltd., Matsudo, JP;
Abstract
An optical attenuator comprising an optical fiber and at least a light attenuating portion disposed on the optical fiber. The light attenuating portion is formed such that a part of the optical fiber is heated by an opposing pair of discharge electrodes or gas burners and then compressed in the axial direction to provide a spherically contoured light attenuating portion or pulled in the axial direction to provide a light attenuating portion having a reduced diameter. In addition, a method and an apparatus for producing an optical fiber of the foregoing type are disclosed. The method is practiced by way of the steps of heating a part of an optical fiber and then physically deforming the heated part to serve as a light attenuating portion by compressing or pulling it in the axial direction. The apparatus includes as essential components a stationary clamp jig, and a movable clamp jig arranged opposite to the stationary clamp jig and an opposing pair of discharge electrodes or gas burners for heating a part of the optical fiber. The movable clamp jig is displaced toward or away from the stationary clamp jig by rotationally actuating a micrometer.