Browse Prior Art Database

Improved Suspension for ESCON Fiber Optics Connector

IP.com Disclosure Number: IPCOM000105579D
Original Publication Date: 1993-Aug-01
Included in the Prior Art Database: 2005-Mar-20
Document File: 4 page(s) / 83K

Publishing Venue

IBM

Related People

Flint, EB: AUTHOR [+3]

Abstract

This invention discloses a conical spring geometry that improves pluggability and reduces the manufacturing cost of a fiber optic connector suspension system. The preferred embodiment of this geometry is the ESCON* connector implementation; however, the geometry is not restricted to a particular connector configuration. The spring geometry affects the forces acting on the ferrule as it enters the bore. Therefore it affects the plug range of the connector. The plug range is the distance that the optical subassembly (OSA) can be offset (bore offset) relative to the design center of the ferrule, before excessively high forces are required to complete the plug event.

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This is the abbreviated version, containing approximately 52% of the total text.

Improved Suspension for ESCON Fiber Optics Connector

      This invention discloses a conical spring geometry that
improves pluggability and reduces the manufacturing cost of a fiber
optic connector suspension system.  The preferred embodiment of this
geometry is the ESCON* connector implementation; however, the
geometry is not restricted to a particular connector configuration.
The spring geometry affects the forces acting on the ferrule as it
enters the bore.  Therefore it affects the plug range of the
connector.  The plug range is the distance that the optical
subassembly (OSA) can be offset (bore offset) relative to the design
center of the ferrule, before excessively high forces are required to
complete the plug event.

      Fig. 1 shows the conically shaped spring.  View A-A illustrates
spring cut-end 1, that contacts the back bone (Fig. 2).  View B-B
shows spring cut-end 2, that contacts the washer.  Fig. 2 shows the
ferrule suspension assembly, that comprises of the ferrule, back
bone, spring and washer.  When plugging the connector to the OSA, the
ferrule suspension assembly assists in aligning the ferrules to the
OSA bores.

      The results of the plugging experiments that were conducted on
the conical spring are shown in Fig. 3.  These experiments indicate
that the conical spring has the advantage that it's plug
characteristics are independent of spring orientation.  This feature
simplifies the manufacturing process by eliminating the need to
orient the spring during connector manufacturing.  Fig. 3 is a plot
of plug insertion force vs.  bore offset, taken using the
micropositioner tool [*] The negative and positive offsets shown are
related to bore movement directions:  'In' or toward the other
ferrule and 'Out', respectively.  As the plot shows, there is no
significant difference...