Patent ID: 6666586
Filing Date: 2003-12-23
Classification: G02B

Abstract:
An optic device adapted to connect ends of two optic fibers in an aligned but spaced fashion and adapted to adjust attenuation of optic signal traveling between the optic fibers, the optic device comprising:a stationary portion comprising: a base body adapted to be secured to an external fixture and forming a first fiber connection member in a first surface thereof for connection with a first one of the two optic fibers, the base body defining a central bore extending through the first fiber connection member along a central axis, and a sleeve having a first end received in the central bore for receiving the end of the first optic fiber; and a movable portion comprising: a cylinder having a proximal end received in the central bore along the central axis and receiving a second end of the sleeve whereby the cylinder is axially movable with respect to the base body along the central axis, the cylinder having an external threading; second fiber connection member mounted to the cylinder to be axially movable therewith, the second fiber connection being adapted to connect a second one of the two optic fiber with the end of the second optic fiber received in the second end of the sleeve whereby the axial movement of the cylinder induces change of a space between ends of the optic fibers, and a knob ring having inner threading engaging the external threading of the cylinder, the knob being rotatably mounted to but being not axially movable with respect the base body whereby rotation of the knob induces axial movement of the cylinder and the second fiber connection member with respect to the base body and the first fiber connection member; wherein the body has a second surface in which a cavity is defined, at least one notch being defined in the second surface and in communication with the cavity, a coupling ring being received in the cavity and forming an outwardly extending tab snugly received in the notch for rotatably fixing the coupling ring to the base body, the cylinder extending through die coupling ring and forming an axially-extending groove for movably receiving a tab inwardly extending from the coupling ring thereby preventing the cylinder from rotation with respect to the base body while allowing axial movement of the cylinder with respect to the base body; wherein a stop ring is fit over and attached to the cylinder for limiting the axial movement of the cylinder with respect to the base body in a first direction along the central axis; wherein the second fiber connection member forms a flange for engaging and thus limiting the axial movement of the cylinder with respect to the base body in a second direction along the central axis; wherein the stationary portion further comprises a retainer ring received and retained in the central bore, the retainer ring receiving and retaining the first end of the sleeve; wherein the retainer ring is externally threaded and wherein the central bore is inner-threaded for threadingly engage the threading of the retainer ring thus retaining the retainer ring in the central bore; wherein notches are defined in an end of the retainer ring for engaging a tool to facilitate the engagement between the retainer ring and the central bore; wherein the knob ring comprises a circular flange rotatably received in a circular recess defined in a second surface of the base body, the base body defining at least one bolt hole threadingly engaging a bolt having a head partially overlapping the flange of the knob ring for retaining the knob ring in the recess; wherein the knob ring comprises a circular flange rotatably received in a circular recess defined in a second surface of the base body, the base body defining at least one bolt hole threadingly engaging a bolt having a head partially overlapping the flange of the knob ring, the bolt being selectively tightened to secure the knob ring in position; wherein the second fiber connection member forms inner threading engaging the external treading of the cylinder, the second fiber connection member and the cylinder forming aligned holes for receiving a pin that fixes the second fiber connection member to the cylinder.