Retracting optical fiber connector

• US 5,080,461 A
• Filed: 10/31/1990
• Issued: 01/14/1992
• Est. Priority Date: 10/31/1990
• Status: Expired due to Term

• Current Assignee: Commscope Inc of North Carolina (CommScope Holding Company, Inc.)
• Original Assignee: AT&T, Inc.
• Inventors: Pimpinella, Richard J.
• Primary Examiner(s): ULLAH, AKM E
• Application Number:
  US07/608,102
• Time in Patent Office: 440 Days
• Field of Search: 350/96.18, 350/96.2, 350/96.21
• US Class Current: 385/65
• CPC Class Codes: G02B 6/32 having lens focusing means positioned between opposed fibre ends with lens being an integral part of the single fibre end G02B6/262
• CPC Class Codes: G02B 6/3809 without a ferrule embedding the fibre end, i.e. with bare fibre end
• CPC Class Codes: G02B 6/382 with index-matching medium between light guides provisionally see G02B6/4212
• CPC Class Codes: G02B 6/3821 with axial spring biasing or loading means G02B6/3847 takes precedence
• CPC Class Codes: G02B 6/3839 for a plurality of light guides
• CPC Class Codes: G02B 6/3849 using mechanical protective elements, e.g. caps, hoods, sealing membranes G02B6/3816 takes precedence; provisionally see H01R13/44
• CPC Class Codes: G02B 6/3873 Connectors using guide surfaces for aligning ferrule ends, e.g. tubes, sleeves, V-grooves, rods, pins, balls
• CPC Class Codes: G02B 6/3885 Multicore or multichannel optical connectors, i.e. one single ferrule containing more than one fibre, e.g. ribbon type optical ribbon cable G02B6/4403, G02B6/448

Abstract

Two sets of optical fiber ends to be connected are contained in opposing v-grooves in the respective interiors of a first (left) and a second (right) mating housings. In the unengaged position, the housing accesses are closed to protect the fibers. In the engaged position, the two housings form a protective enclosure. Each housing include mechanisms which are actuated by surface features of the other housing during mating engagement, to open the access doors to the housing interiors. Each fiber groove contains a fixed alignment ball whose center is on the fiber core axis. In the left housing, the v-groove in which the fiber and ball are contained, is formed on the underside of a pivotally mounted finger. When not engaged to the right housing, the finger is held in a retracted position. As the two housings engage, an actuator slidably mounted in the left housing is moved inwardly by contact with the right housing. This allows the fiber-containing finger in the left housing to commence pivoting downward on a detent of the actuator. Toward the end of the stroke, this ball and fiber assembly come to rest in an alignment groove formed in the floor of the right housing.

Claims

1. Apparatus for connecting two sets of optical fibers, comprising:

first and second members, each comprising one or more v-grooves for fixedly containing a corresponding number of fiber ends of the respective fiber sets;

the v-grooves of said first member being spaced apart congruently with respect to the v-grooves of said second member;

a focusing-alignment element fixedly mounted in each said v-groove adjacent each said fiber end;

each said element being shaped to self-center in its respective v-groove in a position that aligns its optical axis with that of the fiber contained therein;

each said element of said first member being further shaped to self-center in the corresponding v-groove of said second member to place the respective corresponding fiber axis in alignment; and

means for retaining said first and second members in fixed relation when said focusing-alignment elements are in their alignment position.

2. Apparatus in accordance with claim 1, wherein said focusing-alignment elements are spherical.

3. Apparatus in accordance with claim 2, further comprising:

means for positioning said first member with respect to said second member to place the individual optical fibers contained in said first member in a retracted position or alternatively in said alignment position.

4. An optical fiber connector for connecting two sets of optical fibers, comprising:

left and right mating housings;

said left housing comprising a fiber-mounting member pivotally mounted in the housing interior;

said member comprising one or more v-grooves for fixedly containing a corresponding number of fiber ends of the first fiber set;

a first focusing-alignment element fixedly disposed in the v-groove adjacent each said fiber end of the first fiber set;

each said first element being shaped to self-center in its respective v-groove in a position that aligns its optical axis with that of the fiber contained therein;

said right housing comprising a floor containing one or more v-grooves for fixedly containing a corresponding number of fiber ends of the second fiber set;

the v-grooves of said first member being spaced apart congruently with respect to the v-grooves of said floor;

a second focusing-alignment element fixedly disposed in the v-groove of said right housing floor adjacent each said fiber end;

each said first focusing-alignment element being further shaped to self-center in a corresponding v-groove of said floor of said right housing to place the respective corresponding fiber axis in alignment; and

means for retaining said fiber-mounting member of said first housing and said floor of said second housing in fixed relation when said elements are in their alignment position.

5. The optical connector of claim 4, wherein said left housing further comprises:

a front access door to the interior of said housing;

plunger means pivotally mounting said door in a normally closed position;

said plunger means supporting said fiber-containing member member in its retracted position when said door is closed;

means responsive to the engagement of said first and second housings for opening said door and moving said plunger rearwardly in said left housing; and

means responsive to said plunger rearward movement for lowering said member, thereby bringing said first element into engagement with the v-groove of said right housing floor to effect an optical transmission path between said respective fiber ends.

6. The optical connector of claim 5, wherein said left housing further comprises:

a front wall; and

means for biasing said plunger means in a forward position against the interior side of said front wall, thereby to maintain said door in its closed position.

7. The optical connector of claim 6, wherein said right housing further comprises:

an entrance door;

means for slidably mounting said entrance door in said right housing; and

means for biasing said entrance door in a forward direction, thereby to maintain said door closed door when said housings are unengaged.

8. The optical connector of claim 7, further comprising:

means for mounting said member of said left housing to have freedom of movement in the direction of the pivot pin axis.

9. The optical connector of claim 8, wherein said left housing further comprises:

an upper guide surface and an alignment finger formed on said upper guide surface; and

said right housing further comprises;

an alignment slot formed in the front, said finger closely engaging said slot, thereby to prevent said v-grooves containing the mating fibers from vibrating out of alignment.

10. The optical connector of claim 9, wherein the distance of said focusing-alignment elements from the light-emitting ends of the respective fibers, is set and thereafter fixed in an epoxy having an index of refraction matching the refractive indices of said fibers and said elements.

11. The optical fiber of claim 10, wherein each said focusing-alignment element is coated with an anti-reflective material.