Structure and fabrication of components for connecting optical fibers

• US 4,925,267 A
• Filed: 07/02/1984
• Issued: 05/15/1990
• Est. Priority Date: 07/02/1984
• Status: Expired due to Term

• Current Assignee: Senshin Capital LLC (Intellectual Ventures LLC)
• Original Assignee: Polaroid Corporation (PLR IP Holdings LLC)
• Inventors: Plummer, William T., Boyea, Robert J.
• Primary Examiner(s): Gonzalez, Frank
• Assistant Examiner(s): Ullah, Akm E.
• Application Number:
  US06/627,053
• Time in Patent Office: 2,143 Days
• Field of Search: 350/96.18, 350/96.20, 350/96.21
• US Class Current: 385/74
• 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 6/3817 containing optical and electrical conductors cables including electrical and optical conductors H01B11/22; G02B6/3816 takes precedence
• CPC Class Codes: G02B 6/3821 with axial spring biasing or loading means G02B6/3847 takes precedence
• CPC Class Codes: G02B 6/3853 Lens inside the ferrule lensed connectors G02B6/32
• CPC Class Codes: G02B 6/3869 Mounting ferrules to connector body, i.e. plugs
• CPC Class Codes: G02B 6/3874 using tubes, sleeves to align ferrules
• CPC Class Codes: G02B 6/3887 Anchoring optical cables to connector housings, e.g. strain relief features
• CPC Class Codes: G02B 6/3894 Screw-lock type

Abstract

The structure of a miniature component for use in connecting optical fibers along with methods for fabricating the component. A small scale tube having precision surfaces inside and out has formed directly in it a converging, preferably plastic, lens capable of imaging a fiber end properly located into assimilarly situated fiber in another like facing component. The outside precision surfaces of the tube serve as references for precision alignment of the component while its inside precision surfaces aid in formation of the lens.

Claims

1. A miniature connector pin for use with plugs to connect optical fibers, said connector pin comprising:

a metal tube having a predetermined length, inside and outside surfaces precisely concentric, and an endface precisely perpendicular to the longitudinal axis of said tube; and

a converging plastic lens molded directly within said tube with its optical axis coincident with said longitudinal axis of said tube whereby said outside surface and said endface serve as reference for facilitating positioning said lens and said inside surface of said tube serves as a precise surface to facilitate molding said plastic lens in situ.

2. The component of claim 1 wherein said plastic lens is a thick lens having surfaces of form aspheric and plano.

3. The component of claim 1 wherein said tube is fabricated of brass and said plastic lens comprises acrylic plastic.

4. A connector for optically coupling at least one pair of optical fibers, said connector comprising:

a pair of mateable connector halves each of which includes at least one connector pin where each pin comprises;

(a) a metal tube having a predetermined length, inside and outside surfaces precisely concentric, and an endface precisely perpendicular to the longitudinal axis of said tube; and

(b) a converging plastic lens molded directly within said tube with its optical axis coincident with said longitudinal axis of said tube whereby said outside surface and said endface serve as references for facilitating positioning said lens and said inside surface of said tube serves as a precise surface to facilitate molding said plastic lens in situ,

said connector halves being structured, when mated, to join said other ends of their respective metal tubes with said reference surfaces of each in concentric relationship and with said given point of each of their said other end face located in predetermined fixed relationship to thereby align said axis of each of their respective lens and provide a fixed distance therebetween to effect coupling.