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    • 1. 发明授权
    • Sub-miniature optical fiber cables, and apparatuses and methods for
making the sub-miniature optical fiber cables
    • US6068796A
    • 2000-05-30
    • US208708
    • 1998-12-10
    • Lionell GrahamJames Robert HolmanTerry Don MathisMontri Viriyayuthakorn
    • Lionell GrahamJames Robert HolmanTerry Don MathisMontri Viriyayuthakorn
    • B29C47/28B29C47/94B29D11/00G02B6/44
    • B29C47/28B29C47/0014B29C47/94B29D11/00663G02B6/4402G02B6/4403G02B6/443G02B6/4479G02B6/4495
    • A simplex optical fiber cable of this invention includes an optical fiber, a buffer preferably of nylon, surrounding and in contact with the optical fiber, a yarn layer with strength fibers, preferably aramid fibers, disposed about the buffer and a sheath preferably formed of polyvinyl chloride (PVC) surrounding and in contact with the yarn layer. In cross-section, the simplex optical fiber cable has a diameter less than 2.0 millimeters (mm), and thus is much smaller in diameter than optical fiber cables presently available. Preferably, if the buffer is relatively tin providing limited protection to the optical fiber, a slick substance such as talc is applied to an outer surface of the buffer before the yam layer is disposed thereon. The slick substance allows the buffer of the optical fiber to slide to a degree in contact with the yarn layer and thus reduces fatigue caused by axial movement of a ferrule of the connector terminating the optical fiber cable. On the other hand, if the buffer is relatively thick, a friction-reducing substance such as Modaflo.TM. can be applied to the optical fiber to allow the buffer to be stripped relatively easily. A zip-cord duplex optical fiber cable of this invention includes essentially two simplex optical fiber cables with their respective sheaths joining at a middle portion along the axial length of the simplex optical fiber cables. Thus, in cross-section, the zip-cord duplex optical fiber cable has a figure-eight shape with a relatively thin portion in the middle which can be manually pulled apart to separate the zip-cord duplex optical fiber cable into separate simplex optical fiber cables. This feature of the invention allows the zip-cord duplex optical fiber cable to be split at its ends to allow connectors attached to respective ends of the optical fiber cables for connection to respective spaced connector receptacles. A second duplex optical fiber cable of this invention includes two simplex optical fiber cables arranged side-by-side with an oversheath extruded about and holding together the two simplex optical fiber cables. In cross-section, the two duplex optical fiber cables of this invention are less than 2.0 mm in height and 4.0 mm in width, and thus are much smaller than currently available duplex optical fiber cables. The invention also includes die assemblies and methods for making the simplex and duplex optical fiber cables.
    • 3. 发明授权
    • Buffered optical fiber having a strippable buffer layer
    • 具有可剥离缓冲层的缓冲光纤
    • US5684910A
    • 1997-11-04
    • US669119
    • 1996-06-24
    • John Thomas ChapinLionell GrahamJames Robert HolmanMontri Viriyayuthakorn
    • John Thomas ChapinLionell GrahamJames Robert HolmanMontri Viriyayuthakorn
    • G02B6/44G02B6/02G02B6/245G02B6/22
    • G02B6/443G02B6/4402G02B6/02G02B6/02395G02B6/245
    • A buffered optical fiber (20) includes an optical fiber (21) comprising a core and a cladding. Typically, the optical fiber is enclosed by at least one layer (23) of coating material. The optical fiber is enclosed by a plastic buffer layer (30). Interposed between the optical fiber and the buffer layer is a boundary layer (40). Importantly, the boundary layer of the present invention is a low modulus material applied as a substantially thick layer relative to the buffer layer. In a preferred embodiment, the wall thickness of the boundary layer is about one-forth to one-third the wall thickness of the buffer layer. However, depending on the particular materials selected for the buffer and boundary layer, the wall thickness of the boundary layer can be as thin as one-twenty-fifth (1/25) of the buffer layer. As a result of the present design, there is sufficient adhesion between the buffer layer and the underlying coating material to maintain the buffer layer in place during normal use of the buffered optical fiber. On the other hand, the adhesion is low enough so that the buffer layer may be removed upon the application of reasonably low mechanical stripping forces. Advantageously, the boundary layer also allows the selective removal of the optical fiber coating material as well as the plastic buffer layer.
    • 缓冲光纤(20)包括包括芯和包层的光纤(21)。 通常,光纤被涂覆材料的至少一层(23)包围。 光纤由塑料缓冲层(30)包围。 介于光纤与缓冲层之间的是边界层(40)。 重要的是,本发明的边界层是相对于缓冲层应用为基本厚的层的低模量材料。 在一个优选实施例中,边界层的壁厚约为缓冲层的壁厚的约1/4的1/3。 然而,根据为缓冲层和边界层选择的特定材料,边界层的壁厚可以是缓冲层的二十五分之一(+ E,fra 1/25 + EE)。 作为本设计的结果,在缓冲的光纤的正常使用期间,缓冲层和下面的涂层材料之间具有足够的粘附力以将缓冲层保持在适当位置。 另一方面,粘合力足够低,使得缓冲层可以在施加相当低的机械剥离力的情况下被去除。 有利地,边界层还允许选择性地去除光纤涂层材料以及塑料缓冲层。