Optical fiber connector

• US 4,812,007 A
• Filed: 12/07/1987
• Issued: 03/14/1989
• Est. Priority Date: 12/07/1987
• Status: Expired due to Term

• Current Assignee: Nortel Networks Limited (Nortel Networks Corporation)
• Original Assignee: Northern Telecom Limited (Nortel Networks Corporation)
• Inventors: Lukas, Helmut H.
• Primary Examiner(s): Lee, John D.
• Assistant Examiner(s): PALMER, PHAN T H
• Application Number:
  US07/130,253
• Time in Patent Office: 463 Days
• Field of Search: 350/96.20, 350/96.21, 350/96.22, 439/275
• US Class Current: 385/60
• CPC Class Codes: G02B 6/3834 Means for centering or aligning the light guide within the ferrule
• CPC Class Codes: G02B 6/3854 Ferrules characterised by materials
• CPC Class Codes: G02B 6/3857 Crimping, i.e. involving plastic deformation
• CPC Class Codes: G02B 6/3874 using tubes, sleeves to align ferrules
• CPC Class Codes: G02B 6/3893 Push-pull type, e.g. snap-in, push-on
• CPC Class Codes: G02B 6/3897 Connectors fixed to housings, casing, frames or circuit boards G02B6/44528 takes precedence

Abstract

In an optical fiber connector having a snap lock latching arrangement, internal springs act between housings and fiber holding inserts to bias the fiber holding inserts axially together into an alignment sleeve and to bias the housings axially apart to a stop position at which latching formations on the housings abut axially together. The biasing arrangement inhibits relative axial movement of the inserts and housings which would result in variable insertion loss at the connection. Stop formations provided on one of the housings center the housings with respect to one another to facilitate disengagement of the snap lock engagement.

Claims

1. An optical fiber connector, comprising:

a female member having a continuous wall defining a chamber open at one end of the female member, the wall having a first wall portion which carries a first latching formation and a second wall portion opposite the first wall portion, the first latching formation being accessible from within the chamber, and the wall being resiliently deformable such that inward deformation of the wall at opposed locations spaced angularly in opposite directions from the first latching formation causes outward deformation of the wall at the first latching formation to move the first latching formation outwardly;

a male member for assembly to the female member by insertion axially into the open end of the chamber, the male member having a first side which carries a second latching formation, a second side opposite the first side, and a lateral extension carrying a stop formation spaced laterally of the second side, said second latching formation provided on the male member for engagement with the first latching formation to latch the male member to the female member, the male member being spaced inwardly of the wall at said opposed locations when latched within the chamber to permit inward deformation of the wall at said locations sufficient to disengage the first latching formation from the second latching formation by outward movement of the first latching formation, the first wall portion of the female member being adjacent to the first side of the male member and the second wall portion of the female member fitting between the second side of the male member and the stop formation when the male member is fitted to the female member, and the stop formation limiting lateral movement of the second wall portion upon inward deformation of the wall at said opposed locations so that further inward deformation of the wall at said opposed locations forces the first wall portion away from the first side to disengage the first latching formation from the second latching formation; and

a first fiber holding means of the connector within the female member for holding an end portion of a first optical fiber to extend axially along the female member, and a second fiber holding means of the connector within the male member for holding an end portion of a second optical fiber to extend axially along the male member such that assembly of the male member to the female member axially aligns the first and second optical fibers.

2. An optical fiber connector as defined in claim 1, wherein:

at least one of the fiber holding means is axially movably mounted to its respective member; and

the connector further comprises resilient biasing means operable between said one of the fiber holding means and its respective member when the members are latched together to urge the first and second fiber holding means axially together and to urge the male and female members axially apart to a stop position at which the latching formations abut axially together.

3. A connector as defined in claim 1, wherein one of the latching formations comprises a projection and the other of the latching formations comprises a recess for receiving the projection to latch the male member to the female member.

4. A connector as defined in claim 3, wherein the projection has an inclined camming surface which faces forwardly as the male member is inserted into the female member for camming the wall outwardly upon insertion to permit movement of the male member along the chamber until the projection enters the recess, and a rearwardly facing engaging surface for engaging an edge of the recess when the projection is in the recess to prevent withdrawal of the male member from the chamber.

5. A connector as defined in claim 3, wherein the wall has a rib extending axially of the female member and projecting inwardly into the chamber, the first latching formation is a recess in said rib opening inwardly into the chamber, the male member has an axially extending, outwardly opening channel for slidably receiving the rib to guide the male member in an axial direction when the male member is inserted into the chamber, and the second latching formation is a projection within the channel.

6. A connector as defined in claim 1, wherein the wall has two opposed first latching formations and the male member has two opposed second latching formations, each engageable with a respective one of the first latching formations to latch the male member to the female member, and each movable outwardly by inward deformation of the wall at said locations to disengage the first latching formations from the second latching formations.

7. A connector as defined in claim 6, wherein the wall, when undeformed, is generally oval in a section normal to a longitudinal axis of the female member with said first latching formations being on a minor axis of the wall and said locations being on major axis of the wall.

8. A connector as defined in claim 2, wherein the fiber holding means have complementary surfaces which mate to guide the fiber holding means into axial alignment when the fiber holding means are urged axially together.

9. A connector as defined in claim 8, wherein one of the fiber holding means comprises an axially extending sleeve for receiving the other of the fiber holding means, said sleeve having converging inner surface regions complementary to converging outer surface regions of the other of the fiber holding means.

10. A connector as defined in claim 9, wherein the converging surface regions are conical.

11. A connector as defined in claim 1, wherein:

each of the first and second wall portions carries a respective first latching formation;

each of the first and second sides carries a respective second latching formation;

the lateral extension carries first and second stop formations spaced laterally of the first and second sides respectively;

each wall portion fits between a respective side and stop formation when the male member is fitted to the female member; and

each stop formation limits lateral movement of a respective wall portion upon inward deformation of the wall at said opposed locations to force the other wall portion laterally against its respective stop formation, adequate clearance being provided between each side and its respective stop formation to permit disengagement of a respective first latching formation from a respective second latching formation.

12. A connector as defined in claim 11, wherein each stop formation comprises a pair of stop projections, all stop projections being equally laterally spaced from the male member and each pair of projections being spaced apart along a respective side of the male member.