Abstract:
A wet to dry, single use fiber optic connector end face cleaning device. The device is comprised a of a first swab, the first swab having a cleaning head and a first grasping end, the cleaning head having a presaturated fabric attached thereto, and a second swab, the second swab having a drying head and a second grasping end, the drying head having a drying fabric attached thereto. In use, the cleaning head of the first swab is positioned adjacent to the drying head of the second swab, the cleaning head and the drying head at different elevations. Also disclosed is a method for using the fiber optic connector end face cleaning device.

Description:
BACKGROUND OF THE INVENTION 
     The present invention is directed to a swab for cleaning. More particularly, the present invention pertains to a single use, fiber optic connector end face cleaning device. 
     Swabs arc used in all manners of cleaning. For example, every one will recognize common cotton tipped swabs that are used for person hygiene and care. Because of the compact and effective nature of these swabs, they have been adopted for use in numerous areas of technology and manufacture. One such area is the cleaning and maintenance of fiber optic devices. 
     Within the past several decades, fiber optic lines have transformed the telecommunications industries and have made the Internet possible to millions. Fiber optics lowers costs and allows for faster transmissions times over long distances over traditional methods of communication. Fiber optics also plays a significant role in a variety of other applications, including aerospace, navigation and military applications. The great advantage of fiber-optic cable is that it does not suffer the same signal losses as other signal transfer modalities, eliminating the need for amplification processes. With the advent of standardized fiber optic connectors, fiber optic technology is being used more than ever in increasingly more industries. Thus, concern over proper cleaning and maintenance of fiber optic components has also increased. 
     During manufacture and use of fiber optic components, it is not unusual for pieces of manufacturing debris, such as dust and fibers or other particulate debris to be left on surface of the components. It is also not unusual for light oils, such as fingerprint and natural skin oils, gels or other lubricants to be found oil many of these parts. The debris and oils, however, can significantly degrade, distort or prevent the proper and precise transmission of images. 
     Of particular importance is the fiber optic connector component and its end face. The fiber optic connector end face must be absolutely clean before it is inserted into a transmitter or receiver. Upwards of seventy, percent (70%) of signal transmission problems are caused by soiled connectors. Fiber optic connector cores are relatively small; single mode fibers have cores that are narrower than a human hair so that even the smallest amount of dust, lint, oil or other foreign particle compromises the integrity of the signal being sent over the fiber. A single dust particle as small as a micrometer landing on the core of a single-mode fiber can cause significant signal loss. In addition, foreign particles can cause air gaps or misalignments between the cores of mating surfaces, resulting in significant attenuation or back-reflection. Larger dust particles can completely cloud the core of a single-mode fiber, resulting in signal degradation and eventually signal loss if the dirt and oils are not removed regularly. 
     Thus, clean fiber optic connections are vital for maintaining error-free signal transmission in optical systems. It is essential that fiber optic connectors are cleaned ever time they are mated and unmated. 
     Conventional methods of cleaning, such as compressed air or dipping in alcohol are not sufficient in removing substances left by connector end caps and other contaminants, and using twist and turn or figure-eight cleaning motions can damage the connector by grinding any dust or grit that may be present into the end face, resulting in the need for field replacement or repolishing. 
     Dry cleaning may be moderately effective if the soil is a light particle. However, dry cleaning a dusty connection in an environment where grit is present can scratch a connector end face. Wet cleaning provides a measure of cleaning safety to a dusty connection, but over saturation causes solvent entrapment and contamination in the connector. As the excess solvent evaporates, it can become trapped in the connection and promote moisture condensation. Misuse or overuse of cleaning products can not only result in signal degradations, but can also damage the optical fiber end face polish. 
     Other methods involve a wetting and driving system of cleaning, a two step process wherein the connector end face is wetted with a cleaning fluid, or a wipe is saturated with cleaning fluid and then wiped dry with a cloth fabric. However, by the time the soiled solvent is removed (wiped dry), the solvent has had time to evaporate, leaving behind the soil. The soil is re-deposited onto the connector end face, leaving residue and watermarks. In addition, current wet-to-dry systems are large and intended for multiple use, rather than single use, thus, forcing the user to store contaminated cleaning devices. 
     Accordingly, there is a need for a fiber optic connector end face cleaning device and method of using same that can be used for cleaning sensitive components and surfaces and is portable, compact, convenient, and disposable. Desirably, such a device leaves little to no residue from the device within the component or on the surface and does not damage the connector end face by grinding, over-saturating, or allowing soil to redeposit on the end face. 
     BRIEF SUMMARY OF THE INVENTION 
     The present invention pertains to a wet to dry, single use fiber optic connector end face cleaning device comprised of a first swab and a second swab. The first swab has a cleaning head and a first grasping end. The cleaning head has a fabric attached which is wet. The second swab has a drying head and a second grasping end. The drying head has a drying fabric attached thereto. The first and second grasping ends are formed having a rectangular cross-section. 
     When used, the cleaning head is positioned adjacent to the drying head, with the head and the drying head at different heights. The cleaning head of the first swab is wetted with a cleaning solvent; the solvent can be water, an ester, an alcohol, an aliphatic hydrocarbon or a combination. The material attached to the cleaning and drying heads of the first and second swabs is a thick synthetic suede microfiber. 
     The first swab and the second swab are packaged in hermetically-sealed foil or foil-like packaging, called a dual pouch, having separate first and second pouches. The first swab is packaged in the first pouch and the second swab is packaged in the second pouch. The fabric attached to the cleaning head has a width about equal to a width of the swab. The grasping end is formed from a polymeric material, and can include a static dissipative constituent. 
    
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
       The benefits and advantages of the present invention will become more readily apparent to those of ordinary skill in the relevant art after reviewing the following detailed description and accompanying drawings, wherein: 
         FIG. 1  is a side view of a face cleaning device embodying the principles of the present invention; 
         FIG. 2  is a plan view of the top swab of the present cleaning device; 
         FIG. 3  is a plan view of the bottom swab of the present cleaning device; 
         FIG. 4  is a plan view of the top swab and bottom swab together; 
         FIG. 5  is an enlarged side view of an embodiment of the present cleaning device; and 
         FIG. 6  is a plan view of an embodiment of the dual pouch packaging system. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     While the present invention is susceptible of embodiment in various forms, there is shown in the drawings and will hereinafter be described a presently preferred embodiment with the understanding that the present disclosure is to be considered an exemplification of the invention and is not intended to limit the invention to the specific embodiment illustrated. 
     It should be further understood that the title of this section of this specification, namely, “Detailed Description Of The Invention”, relates to a requirement of the United States Patent Office, and does not imply, nor should be inferred to limit the subject matter disclosed herein. 
     The present invention pertains to a wet-to-dry, swab device and method for cleaning fiber optic connector end faces. The wet-to-dry device is comprised of a pre-saturated, wet swab and a dry swab used in tandem. Solvent is applied and removed from the connector end face in one continuous motion by wiping the end face on the pre-saturated swab, over a step, and onto the dry swab to dry the connector end face. 
     Referring now to the figures and in particular to  FIG. 1 , where an embodiment of the present invention is shown, the fiber optic connector end face cleaning device  10  is composed of two separate, flat, elongated members or tab-like swabs,  12 ,  14  with heads  26 ,  28  at one end of each swab  12 ,  14 , with the opposing ends used as handles  20 ,  22 . 
     The head  26  of the first swab  12  has a fabric  16  covering the head  26 . The width of the fabric  16  is about the width of the swab  12 , the fabric  16  extending to the edges  16   a ,  16   b  and  16   c  of the first swab  12 . The fabric  16  of the first swab  12  is presaturated with a cleaning solution. The fabric  16  is an absorbent, lint free fabric with an affinity for the cleaning solvent and is also of sufficient basis weight and strength so that it possesses pad-like or cushioning properties. The fabric/material  16  should prevent over-saturating the fiber optic connection which can cause signal distortion. In the present embodiment, the fabric  16  used is a synthetic ultra suede micro-fiber, approximately 1 mm thick, but may also be formed from other suitable materials such as a non-woven material, such as synthetic chamois of polyurethane or polyvinyl acetate material. 
     The head  28  of the second swab  14  has a fabric  18  covering the head  28 . The width of the fabric  18  is about the width of the swab  14  and extends to the edges  18   a ,  18   b , and  18   c  of the second swab  14 , over the edge  18   a  and along an opposite side of the second swab  14 . The second swab&#39;s fabric  18  remains unwetted, to dry the connector end face, and is an absorbent, lint free fabric with an affinity for the cleaning solvent. The fabric  19  is also of sufficient basis weight and strength so that it possesses pad-like or cushioning properties. In the present embodiment, the fabric  18  is a synthetic ultra suede micro-fiber, approximately 1 mm thick, but may also be formed from other suitable materials such as a non-woven material, such as synthetic chamois of polyurethane or poly vinyl acetate material. 
     A variety of solvents are contemplated to saturate swab  12 , including alcohol, water, ketones, esters, aliphatic hydrocarbons or various blends of these solvents. In one swab, the cleaning solution is a blend of isopropyl alcohol, ethyl alcohol, and a medium-evaporating-rate aliphatic hydrocarbon, such as Isopar E commercially available from ExxonMobil Corporation. 
     The handle  20 ,  22  can be formed from a static dissipative material or may have a static dissipative constituent. The swab handle  20 ,  22  is a plastic or polymer material, but may also be wood. 
     Packaging of the single use cleaning device is also novel.  FIG. 6  slows an embodiment of the dual pouch packaging. The dual pouch  40 , always ensures that the two swabs  12 ,  14  are available, one wet and one dry because each swab  12 ,  14  is individually packaged in hermetically sealed, foil or foil-like laminate pouches that are attached together. The dual pouch  40  is partitioned into two sections,  42 ,  44 , in which the wetted swab  12  may be packaged in a first pouch  46  of the dual pouch  40  and the dry swab  16  can be packaged in a second pouch  48  of the dual pouch  40 . The two pouches  46 ,  48  are separated from each other by partition  50 , such that the wetted swab  12  does not wet or otherwise come into contact with the dry swab  14 . It is also contemplated, however, that the swabs  12 ,  14  may be packaged together in the same pouch, both of them dry, and after removal from the packaging, it is contemplated that the swab  12  is saturated with a suitable cleaning solution from an external source. 
     When used, each swab  12 ,  14  is removed from its pouch. The dry swab  14  is placed on a flat surface with the fabric  18  facing up with the head  28  oriented toward the user The wet swab  12  is aligned atop the dry swab  14  with the head  26  also oriented toward the user. The fabric end  16  of the wet swab  12  should slide up to abut the fabric  18  of the bottom, dry swab  14 . The thickness of the wet and dry swab handles t 12 , t 14 , are about 1 mm-2 mm and thus, acts as a step between the two fabric heads  26 ,  28 . 
     While varying lengths of the first and second swabs are contemplated, in a present embodiment, the first swab  12 , is shorter than the second swab  14  so first swab  12  nay rest completely on the longer second swab  14 . The edge  16   a  of the shorter swab  12  does not have any fabric  16  covering the edge, and the fabric  16  on the top surface of first swab  12  may be cut at 90 degrees or more, as shown in  FIG. 5  at  25 , to prevent the moisture from the first swab  12  from contacting the fabric  18  of the head  28  of the longer, dry swab  14 . The fabric  16  of the shorter swab  12  is saturated in the cleaning solution. The longer swab  14  is packaged dry. 
     The swabs  12 ,  14 , now properly oriented, are held in place on the smooth work surface with one hand while a fiber optic end face is placed on the wetted swab head  26  of the shorter swab  12  and drawn toward the dry swab head  28 , over the step  24 ,  25  between the swab heads  26 ,  28  and onto the fabric  18  of the dry swab head  28  of the longer swab  14  in one continuous, unidirectional motion. In this manner, the connector C end face F employs a wet to dry cleaning method on cleaning fiber optic end faces, known as Combination Cleaning. The step  24 ,  25  keeps one swab  12  saturated and the other swab  14  dry and the thick synthetic suede microfiber acts as both a highly absorbent wiping material and soft cushion to allow the wiping fabric  16 ,  18  to conform to the fiber optic end face. 
     Previous cleaning devices are larger and intended for multiple end face cleaning events and rely on a separate solvent delivery device. This present device, however, is more portable and can be supplied to the end user with a fiber optic network component device. This is a convenient one time use and disposable device, and integrates the wiping material with cushioning material. Other devices employ separate cushioning and wiping material. 
     In addition to the dual swab use described above, the wet swab  12  may be used as a flat, saturated surface in conjunction with an appropriate dry wipe. The day wipe could be non-woven polyester cellulose blend fabric, non-woven melt blown polypropylene fabric or a knitted or woven microfiber fabric. The wipe would need the properties of (1) absorbency to draw soiled solvent from the fiber optic end face, (2) inherent cleanliness to not contribute contamination (especially non-limiting) (3) softness not to scratch the end face and (4) cushioning to permit the wipe surface to conform to the end face. Instead of a single wipe, the dry wipe man be used in a stack of single sheets to provide the necessary cushioning and absorbency. Other configurations of dry wipe that are appropriate for use with the wet swab  12  is within the contemplation, spirit, and scope of this invention. 
     The swab  12  is saturated with a cleaning solvent. The swab  12  may be saturated from an external source, but it is contemplated that the swab  12  is packaged, with the cleaning solvent applied to the fabric  16 , in a chemical resistant package (foil)  40  which will contain the solvents and keep them ready for use. The wet swab  12  is removed from the wet swab pouch  46  of the dual pouch  40  and placed on the dry wipe, which is resting on a fat surface. The swab  12  would be oriented with the swab head  26  toward the user and the handle  20  farther from the user. The swab is then held in place with finger or thumb on the dry wipe while positioning the fiber optic connector end face on the wet swab head, perpendicular to the surface. The fiber end face is then drawn across the wet swab head, off the step and onto the dry portion of the wipe three times with light pressure. A novel feature of the swabs  12  is the paddle-like construction which provides a flat pre-saturated surface on which a fiber optic end face may be wiped up to three times. The construction is unique in providing a step to separate the wet swab head from the dry wipe. The construction is also unique in that the swabs are sufficiently wide, in relation to their height, so that stacking one on another is a suitable configuration. 
     All patents referred to herein, are hereby incorporated herein by reference, weather or not specifically done so within the text of this disclosure 
     In the present disclosure, the words “a” or “an” are to be taken to include both the singular and the plural. Conversely, any reference to plural items shall, where appropriate, include the singular. 
     From the foregoing it will be observed that numerous modifications and variations can be effectuated without departing from the tire spirit and scope of the novel concepts of the present invention. It is to be understood that no limitation with respect to the specific embodiments illustrated is intended or should be inferred. The disclosure is intended to the appended claims all such modifications as fall within the scope of the claims.