WO2007004157A2 - Dispositif de controle de rayon de courbure a restriction minimale du passage d'air - Google Patents

Dispositif de controle de rayon de courbure a restriction minimale du passage d'air Download PDF

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Publication number
WO2007004157A2
WO2007004157A2 PCT/IB2006/052179 IB2006052179W WO2007004157A2 WO 2007004157 A2 WO2007004157 A2 WO 2007004157A2 IB 2006052179 W IB2006052179 W IB 2006052179W WO 2007004157 A2 WO2007004157 A2 WO 2007004157A2
Authority
WO
WIPO (PCT)
Prior art keywords
bend radius
baseplate
board
coverplate
circuit board
Prior art date
Application number
PCT/IB2006/052179
Other languages
English (en)
Other versions
WO2007004157A3 (fr
Inventor
Leonard R. Renkel Jr.
Nainesh Patel
Original Assignee
Utstarcom, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Utstarcom, Inc. filed Critical Utstarcom, Inc.
Publication of WO2007004157A2 publication Critical patent/WO2007004157A2/fr
Publication of WO2007004157A3 publication Critical patent/WO2007004157A3/fr

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4439—Auxiliary devices
    • G02B6/444—Systems or boxes with surplus lengths
    • G02B6/4453—Cassettes

Definitions

  • This invention relates to the field of bend radius control devices for fiber optic cables for use on printed circuit boards.
  • An optical transponder based board requires a mechanism to dress and maintain a given bend radius for fiber optic cables. Due to the power dissipation levels of active electronic components on the circuit board, it is necessary to permit as much airflow over the board surface as possible to maintain the components within acceptable operating limits.
  • FIGS 1 and 2 depict a printed circuit board 10 with a number of active components 12 mounted thereon such as optical transceivers, field programmable gate arrays (FPGAs), metal-oxide-semiconductor field-effect transistors (MOSFETs), and commercial application specific integrated circuits (ASICSs).
  • the board 10 further includes a number of bend radius control devices 16.
  • a plate 20 is positioned over a portion of the device 16. The function of the plate 20 is to support the bend radius control device 16.
  • the bend radius devices 16 are very low profile and closed for use in limited space areas. The plate 20, however, hinders the air flow over the active components on the board 10. Without free air flow, the amount of heat dissipated from the components leads to an increase in the temperature, beyond the acceptable limits. Such an increase in temperature may negatively affect the operation of the active components.
  • the present invention meets the shortcomings of the prior art by providing a device that maintains a proper bend radius for a fiber optic cable while permitting airflow to pass therethrough.
  • the device includes a plurality of individual standoffs that provide a controlled bend radius and an open environment that promotes maximum airflow through the device.
  • Figure 1 is a perspective view of a bend radius control device of the prior art.
  • Figure 2 is a bottom view of the device shown in Figure 1.
  • Figure 3 is a perspective view of a printed circuit board including a plurality of bend radius control devices made in accordance with the present invention.
  • Figure 4 is a perspective, cut-away view of one embodiment of a bend radius control device made in accordance with the present invention.
  • Figure 5 is a perspective, cut-away view of another embodiment of a bend radius control device made in accordance with the present invention.
  • a printed circuit board 100 having a plurality of electronic components 102 mounted thereto.
  • Some examples of electronic components that may be mounted to the circuit board 100 include optical transceivers, FPGAs, MOSFETs, and commercial ASICSs.
  • Among the components is a plurality of bend radius control devices 110 installed at multiple locations along the length of the circuit board.
  • a bend radius control device 110 made in accordance with the present invention is shown in Figure 4.
  • the device 110 is positioned on the circuit board 100 between an optical transponder 120 and a bulk head terminating point such as an LC connector 130 having an input and an output.
  • the device 110 is a taller, more open device than the device 16 of the prior art, and it provides an open area through which air can flow with minimal restriction.
  • the device 110 leads fiber optic cable 140 from the transponder 120 to the LC connector 130 and stows approximately 1-1.5 meters of fiber optic cable with the proper bend radius.
  • the bend control device 110 may alternatively be placed anywhere on the circuit board 100 where space is available.
  • the diameter may vary depending on the type of cable being managed and its requirements.
  • the device 110 includes a baseplate 150, standoffs 160, and a coverplate 170.
  • the baseplate 150 may be provided with fastening mechanisms 152 to attach the device 110 to the printed circuit board 100.
  • the mechanisms 152 comprise two arms.
  • the baseplate 150 may be provided with a plurality of holes 154 for mounting directly to the printed circuit board 100, as shown in Figure 5.
  • the baseplate 150 has multiple functions in that it serves as an attachment point for securing the device 110 to the circuit board 100 and as a platform for the standoffs 160.
  • the device 110 is provided with a plurality of standoffs 160 that are supported on the baseplate 150.
  • the standoffs are elongate members extending from the baseplate 150.
  • the standoffs 160 provide the controlled bend radius and proper height to enable the device 110 to stow wrapped cable 140 with a correct bend radius.
  • the standoffs 160 are a part of the baseplate, and the coverplate 170 is secured to the standoffs to complete the 'capturing' of the cable 140 which is being managed.
  • a minimum number of standoffs is required to ensure that a circular surface, or close approximation thereto, can be developed.
  • the distance between the standoffs 160 less the space taken up by the cable being managed, allows airflow therethrough. The determination of this distance, as well as the determination of the length of each standoff, is dependent upon the amount of cable 140 to be managed and the space available to permit airflow a free path.
  • the top coverplate 170 is installed after dressing the cable 140 around the controlled bend radius.
  • the coverplate 170 limits the travel the cable may exhibit over its installed lifetime and permits airflow to pass through the device 110 to assist with directing airflow to active components. This is because the coverplate diameter is larger than the circular shape created by the standoffs 160, thus limiting the height that the cable may extend to during installation.
  • the device 110 may be further provided with an isolation pad (not shown) positioned under the baseplate 150, between the baseplate 150 and the circuit board 100.
  • the pad provides electrical insulation in the event that there are active traces on the circuit board at the installation location.
  • the active components mounted on the board 100 dissipate power, which may lead to an increase in temperature that may negatively affect the operation of the components if not controlled.
  • the device 110 has an open design to permit airflow therethrough to aid in cooling the active components on the circuit board and maintaining them within acceptable temperature limits.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Insertion, Bundling And Securing Of Wires For Electric Apparatuses (AREA)
  • Surface Treatment Of Glass Fibres Or Filaments (AREA)

Abstract

L'invention porte sur un mécanisme qui permet d'enrouler un câble de fibre optique tout en conservant un rayon de courbure minimal. Le dispositif de l'invention est construit de manière qu'il permet un passage d'air latéral dans le sens radial par-dessus et à travers la bobine, sans empêcher le refroidissement par passage d'air des composants électroniques adjacents.
PCT/IB2006/052179 2005-06-30 2006-06-29 Dispositif de controle de rayon de courbure a restriction minimale du passage d'air WO2007004157A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US17116205A 2005-06-30 2005-06-30
US11/171,162 2005-06-30

Publications (2)

Publication Number Publication Date
WO2007004157A2 true WO2007004157A2 (fr) 2007-01-11
WO2007004157A3 WO2007004157A3 (fr) 2009-04-16

Family

ID=37604865

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2006/052179 WO2007004157A2 (fr) 2005-06-30 2006-06-29 Dispositif de controle de rayon de courbure a restriction minimale du passage d'air

Country Status (1)

Country Link
WO (1) WO2007004157A2 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5659641A (en) * 1995-12-22 1997-08-19 Corning, Inc. Optical circuit on printed circuit board

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5659641A (en) * 1995-12-22 1997-08-19 Corning, Inc. Optical circuit on printed circuit board

Also Published As

Publication number Publication date
WO2007004157A3 (fr) 2009-04-16

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