| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 065413000 | With step of vapor deposition | 42 |
| 20090165502 | METHOD FOR MANUFACTURING OPTICAL FIBER PREFORM AND OPTICAL FIBER PREFORM APPARATUS - A method for manufacturing an optical fiber preform and an optical fiber preform apparatus are provided which can reduce hydroxyl groups in an optical fiber preform to a sufficient level without requiring any special equipment or operating conditions. When an optical fiber preform is manufactured by the vapor-phase deposition method, the dehydrating treatment is performed on a porous core preform that is obtained by depositing glass microparticles. In this treatment, a dehydrating agent is supplied to a dehydration apparatus through a feeding pipe and a main feeding pipe made of a material having a water permeance factor of 1.0×10 | 07-02-2009 |
| 065414000 | Forming optical fiber or fiber preform by soot buildup (i.e., vapor axial deposition, VAD) | 15 |
| 20120279259 | METHOD AND APPARATUS OF PRODUCING OPTICAL FIBER PREFORM - A method of producing optical fiber preform includes: forming a deposited layer by depositing glass particles on a periphery of a target element in a deposition mode while burning a mixed gas containing a glass source material gas, a flaming gas, and a supporting gas by use of a flaming burner; maintaining a state where the supporting gas flows at a flow velocity greater than or equal to a flow velocity at which a nozzle end of the supporting gas discharge nozzles does not glow while maintaining a pilot burner by allowing the flaming gas to flow to the seal gas discharge nozzle after a seal gas is replaced with the flaming gas in a case where a mode is changed from the deposition mode to a non-deposition mode; and replacing the flaming gas flowing to the flaming gas port with a purge gas. | 11-08-2012 |
| 20130133377 | METHOD FOR PRODUCING SYNTHETIC QUARTZ GLASS - A known method for producing synthetic quartz glass comprises the method steps of: forming a stream of a SiO | 05-30-2013 |
| 20140083140 | METHOD OF MANUFACTURING POROUS GLASS DEPOSITION BODY FOR OPTICAL FIBER - To provide a method for manufacturing a porous glass deposition body for optical fiber without causing deposition unevenness or decreasing the yield, provided is a method of manufacturing a porous glass deposition body by blowing glass fine particles generated from a plurality of burners for glass fine particle synthesis onto a starting member that is moved vertically and rotated on a rotational axis that is a central axis of the starting member. The burners are arranged such that the central axis of each burner shares a plane with the rotational axis of the starting member, and at least two of the planes in which the central axis of one of the burners and the rotational axis of the starting member are arranged form a prescribed angle. | 03-27-2014 |
| 20140174135 | GLASS FINE PARTICLE SYNTHESIS BURNER, GLASS FINE PARTICLE DEPOSITION BODY MANUFACTURING METHOD, AND GLASS FINE PARTICLE DEPOSITION APPARATUS - A glass fine particle synthesis burner comprising a glass raw material gas emission path for emitting glass raw material; a ring-shaped combustible gas emission path for emitting combustible gas arranged outside the glass raw material emission path; a ring-shaped combustion aiding gas emission path for emitting combustion aiding gas arranged outside the combustible gas emission path; and small diameter nozzles for emitting the combustion aiding gas within the combustible gas emission path. In a cross section of the glass fine particle synthesis burner formed by cleaving orthogonal to a central axis thereof, when the glass fine particle synthesis burner is divided into two regions by a predetermined straight line passing through a center of the glass fine particle synthesis burner, a total area of the small diameter nozzles in one of the regions is greater than a total area of the small diameter nozzles in the other region. | 06-26-2014 |
| 20150040616 | OPTICAL FIBER GLASS BASE MATERIAL MANUFACTURING METHOD AND OPTICAL FIBER GLASS BASE MATERIAL - Provided is an optical fiber glass base material manufacturing method that includes flame polishing an outside of a starting base material that includes a core and a first cladding with an oxyhydrogen flame and then arranging a glass fine particle synthesis burner facing the starting base material, which rotates, moving the starting base material and the burner back and forth relative to each other along the starting base material, and depositing glass fine particles produced by hydrolysis of glass raw material in the oxyhydrogen flame as a porous glass layer of a second cladding, the method comprising synthesizing and depositing the glass fine particles under conditions in which a hydrogen flow rate during a first back and forth deposition pass performed immediately after supply of raw material is started is greater than a normal hydrogen flow rate. | 02-12-2015 |
| 20150336839 | BURNER SHIELD TO REDUCE SOOT BUILDUP - A soot deposition burner assembly, having at least one burner including a burner face on a first surface of a burner support. The burner produces a flame which extends generally perpendicularly to the first surface. A burner shield includes a first wall extending generally perpendicularly from the first surface surrounding the burner face. The burner shield has a base end with a first surface area facing toward the first surface and a shield face with a second surface area facing away from the first surface. To reduce the buildup of soot material, the second surface area is smaller than the first surface area, and the wall thickness is less at the shield face than the base end. Additionally, air can be directed along an exterior surface of the first wall from the base end toward the shield face to further reduce soot buildup. | 11-26-2015 |
| 20150360992 | OPTICAL FIBER BASE MATERIAL MANUFACTURING METHOD - Provided is an optical fiber base material manufacturing method that includes, while rotating a starting member formed by fusing both ends of a core rod to dummy rods on an axis of the starting member, moving the starting member and burners back and forth relative to each other and depositing glass microparticles on a surface of the starting member. This method also includes setting two or more axes as back and forth movement axes allowing for back and forth movement relative to the starting member; providing a burner facing the starting member on each of the axes; causing each burner to traverse the starting member to an end of the starting member; and changing a position where at least two burners pass by each other during the traversing movement, in a longitudinal direction of the starting member. | 12-17-2015 |
| 065415000 | Forming glass layers with graded or radially varying refractive index | 3 |
| 20090084141 | Single Mode Optical Fiber and Manufacturing Method Therefor - An optical fiber is formed by performing vapor phase deposition of SiO | 04-02-2009 |
| 20090126408 | Methods for making optical fiber preforms and microstructured optical fibers - A method of making an optical fiber preform includes depositing silica glass soot on the inside of a substrate tube via a chemical vapor deposition operation. The silica glass soot is consolidated into silica glass under controlled conditions such that the consolidated silica glass on the interior of the substrate tube contains a non-periodic array of gaseous voids in a cladding region of the optical fiber preform. The optical fiber preform may be used to produce an optical fiber having a core and a cladding containing voids formed from the gaseous voids of the cladding region of the optical fiber preform. The core of the optical fiber has a first index of refraction and the cladding has a second index of refraction less than that of the core. | 05-21-2009 |
| 20090211300 | METHOD OF FABRICATING OPTICAL FIBER PREFORM - A method of fabricating an optical fiber preform that can give stable and high deposition efficiency from the start to the end of the deposition when synthesizing a large size preform. When fabricating a preform by hydrolyzing a glass raw material gas in flame to generate glass particles and depositing the glass particles on a rotating starting material in the radial direction using a burner with a concentric multiple-tube structure having at least a plurality of small diameter combustion assisting gas-ejecting ports having the same focal length. L | 08-27-2009 |
| 065416000 | Consolidation in situ (e.g., sintering, etc.) | 5 |
| 20110000262 | METHOD FOR DEHYDRATING AND SINTERING POROUS BASE MATERIAL FOR OPTICAL FIBER - A dehydration-sintering furnace includes a core tube configured to dehydrate and sinter a porous base material in fabrication of an optical fiber and having an outlet configured to discharge a vapor. The furnace includes a pressure-variation damper connected to the outlet of the core tube. The furnace includes a trap between the core tube and the pressure-variation damper for collecting the vapor. | 01-06-2011 |
| 20110259055 | BURNER FOR PRODUCING POROUS GLASS PREFORM - A multi-nozzle type burner is used for producing a porous glass preform, the burner having small variations in deposition efficiency with the burner tip being not burned even when axial shift occurs at the concentric multi-tube part of the burner. The present invention provides a burner for producing a porous glass preform with a concentric multi-tube structure, comprising a glass material gas jet port in a center, a plurality of gas jet ports concentrically disposed outside the glass material gas jet port, and small-diameter gas jet ports which are disposed in a line or a plurality of lines concentrically to the glass material gas jet port so as to be enclosed in one of the gas jet ports other than the gas jet ports in the center and at an outermost side, the small-diameter gas jet ports in the same line having an identical focal length. In the present invention, the gas jet ports disposed outside the gas jet port enclosing the small-diameter gas jet ports are each reduced in diameter in a direction toward a burner tip, and satisfy a relationship of L | 10-27-2011 |
| 20110259056 | Burner For Manufacturing Porous Glass Preform - The present invention provides a burner for manufacturing a porous glass preform, which is provided with a combustible gas injection port involving a plurality of small-diameter supporting gas injection ports such that the injection ports of the same row have the equal focal distance, the small-diameter supporting gas injection ports being arranged on the outside of a glass source gas injection port in the center so as to be in a row or in a plurality of rows and concentric with the glass source gas injection port, wherein the small-diameter supporting gas injection ports are bent toward the burner center axis at predetermined positions from the tip ends of the small-diameter supporting gas injection ports so that the focal points of the small-diameter supporting gas injection ports of the same row agree with each other, and the bend angle of the small-diameter supporting gas injection port row closest to the glass source gas injection port in the center of the small-diameter supporting gas injection port rows arranged in the plurality of rows is at most 5 degrees with respect to the burner center axis. | 10-27-2011 |
| 20130139554 | METHOD FOR MANUFACTURING GLASS PREFORM - The present invention provides a method for producing a glass preform capable of improving the deposition efficiency of produced glass fine particles to a starting rod or a glass soot body. The method for manufacturing a glass preform includes controlling the temperature of SiCl | 06-06-2013 |
| 20150033799 | GLASS PARTICLE DEPOSIT PRODUCING METHOD AND GLASS PREFORM PRODUCING METHOD - A glass particle deposit producing method capable of preventing the variation in the outside diameter of a glass particle deposit and enhancing the yield of a glass raw material is provided. A glass particle deposit is produced by mounting a starting rod | 02-05-2015 |
| 065417000 | Inside of tube or hollow form by soot buildup | 5 |
| 20100287993 | Optical fiber manufacture - The specification describes methods for the manufacture of very large optical fiber preforms wherein the core material is produced by MCVD. Previous limitations on preform size inherent in having the MCVD starting tube as part of the preform process are eliminated by removing the MCVD starting tube material from the collapsed MCVD rod by etching or mechanical grinding. Doped overcladding tubes are used to provide the outer segments of the refractive index profile thus making most effective use of the MCVD produced glass and allowing the production of significantly larger MCVD preforms than previously possible. | 11-18-2010 |
| 20150336838 | METHOD AND A DEVICE FOR MANUFACTURING AN OPTICAL PREFORM BY MEANS OF AN INTERNAL VAPOUR DEPOSITION PROCESS, AS WELL AS CORRESPONDING SUBSTRATE TUBE ASSEMBLY - A device for manufacturing an optical preform by means of an internal vapour deposition process including an energy source, a hollow substrate tube having a supply side and a discharge side and the energy source being moveable along a length of the hollow substrate tube, and an elongation tube connected to the hollow substrate tube at the discharge side thereof, wherein the hollow substrate tube extends into an interior of the elongation tube and an internal diameter of the elongation tube is at least 0.5 millimeters larger than an external diameter of the hollow substrate tube. | 11-26-2015 |
| 065418000 | Elongated material feed means within tube (e.g., reactant feed means place inside of tube, etc.) | 1 |
| 20110314874 | APPARATUS AND METHOD FOR MANUFACTURING GLASS PREFORM - An apparatus for manufacturing a glass perform, includes: a dummy tube section, a reservoir portion, and a cooling portion; and a glass tube section in which particles of an alkali metal compound or an alkaline earth metal compound which have flowed into the glass tube section from the dummy tube section are heated by a second heat source which performs traverse, and oxides of the particles being deposited on an inner wall and dispersed in the glass tube section. In the cooling portion of the dummy tube section, vapor of the alkali metal compound or the alkaline earth metal compound generated by heating of a first heat source is cooled and condensed by a dry gas flowing into the dummy tube section, and thereby the particles are generated. | 12-29-2011 |
| 065419000 | With step of collapsing tube | 2 |
| 20090019894 | Method for Manufacturing a Multimode Optical Fibre - The invention relates to a multimode optical fibre having a refractive index profile, comprising a light-guiding core surrounded by one or more cladding layers. The present invention furthermore relates to an optical communication system comprising a transmitter, a receiver and a multimode optical fibre. | 01-22-2009 |
| 20130081430 | METHOD OF MANUFACTURING OPTICAL FIBER BASE MATERIAL AND METHOD OF MANUFACTURING OPTICAL FIBER - Provided is a method of manufacturing an optical fiber base material using a MCVD method, including: a step of heating a glass tube while rotating the glass tube and supplying a gas into a through-hole of the glass tube, wherein in at least a part of the step, the inside of the through-hole is pressurized so that an outer diameter of the glass tube increases. | 04-04-2013 |
| 065421000 | Outside of tube or rod by soot buildup | 21 |
| 20080271495 | Reduction of optical fiber cane/preform deformation in consolidation - According to an embodiment of the invention a method of manufacturing optical fiber cane comprises the steps of: (i) providing a core rod manufactured of relatively low viscosity glass; (ii) depositing SiO | 11-06-2008 |
| 20090211301 | METHOD OF FABRICATING AN OPTICAL FIBER PREFORM AND A BURNER THEREFOR - A method of fabricating an optical fiber preform, capable of depositing glass particles with high deposition rate without reducing deposition efficiency and fabricating an optical fiber preform having little bubbles using a burner having a simple structure, is provided. In the invention, a mixed gas of a glass raw material gas with a combustion assisting gas is ejected from an annular nozzle of a burner having a coaxially multiple tube structure, and a burnable gas is ejected from an inner nozzle located inside the annular nozzle. Alternatively, a mixed gas of a glass raw material gas with a burnable gas may be ejected from an annular nozzle, and a combustion assisting gas is ejected from an inner nozzle located inside the annular nozzle. In each case of the above, the burnable gas and the combustion assisting gas, respectively, are ejected from outer nozzles located outside the annular nozzle. | 08-27-2009 |
| 20100050696 | METHOD FOR MANUFACTURING OPTICAL FIBER PREFORM - A method for manufacturing an optical fiber preform of the invention is a method for manufacturing an optical fiber preform, which forms a deposition portion composed of glass fine particles on a glass rod so as to form a glass fine particle deposition, and suspends the glass fine particle deposition vertically into a heating furnace to heat the glass fine particle deposition to transparentize the deposition portion, the method comprising: a step of forming a hazy portion, by causing a surface portion of the glass rod to sublime and adhere to at least a portion of a region closer to one end of the glass rod than a region of the glass rod where the deposition portion is formed, before said heating; a step of forming the deposition portion by depositing the glass fine particles on the glass rod; and a step of transparentizing the deposition portion by heating the glass fine particle deposition in a state where the proximal end of the glass rod where the hazy portion is formed is held and the glass fine particle deposition is suspended vertically into the heating furnace. | 03-04-2010 |
| 20120024012 | OPTICAL FIBER PREFORM MANUFACTURING APPARATUS AND OPTICAL FIBER PREFORM MANUFACTURING METHOD - An optical fiber preform manufacturing apparatus includes a booth, a reaction chamber disposed inside the booth, a target member disposed within the reaction chamber, a burner that deposits glass particles on the target member, a partition plate that partitions the internal space of the booth into a first space where the reaction chamber and the burner are disposed and a second space, and that has a plurality of through holes that allows the first space and the second space to communicate with each other, an air supply unit that supplies clean air into the first space; and an exhaust unit that discharges air within the second space. | 02-02-2012 |
| 20120118020 | METHOD OF PRODUCING OPTICAL FIBER PREFORM AND OPTICAL FIBER - A method of producing an optical fiber preform includes preparing a glass preform that has a hole extending in a longitudinal direction formed on one end of the glass preform in such a manner that a length of the hole is equal to or less than half of an entire length of the glass preform, synthesizing a porous glass preform by depositing glass particles on an outer circumference of the glass preform having the hole formed on the end, and sintering the porous glass preform after arranging the porous glass preform in such a manner that the end having the hole formed thereon points downward and the hole is open to the air. | 05-17-2012 |
| 20120291494 | MANUFACTURING METHOD FOR GLASS BASE MATERIAL - Provided is a method for manufacturing glass preforms with high yield. In the glass-preform manufacturing method according to the present invention, a glass preform is produced through a fixing step, a deposition step, an extraction step, a vitrification step, and a collapsing step in the enumerated order. At the deposition step, the mean density of the glass soot body deposited on the circumference of the tubular handle | 11-22-2012 |
| 20130036770 | METHOD FOR PRODUCING GLASS BASE MATERIAL - A glass base material producing method produces a glass base material through fixing, deposition, pullout, consolidation, and collapse steps in sequence, while the fixing step inserts and fixes a starting bar | 02-14-2013 |
| 20130074552 | APPARATUS AND METHOD FOR MANUFACTURING OPTICAL FIBER PREFORM - Provided is a method for manufacturing an optical fiber preform using a combustion burner. The method includes at least one of: a step α of, when a mode is changed from a deposition mode to a non-deposition mode, changing a gas discharged from a combustion gas port of the burner from a combustion gas to a purge gas, while maintaining a pilot light and a flow rate of a supporting gas from supporting gas discharge nozzles of the burner so that the nozzle tip does not glow; and a step β of, when the mode is changed from the non-deposition mode to the deposition mode, changing a gas discharged from the combustion gas port from a purge gas to a combustion gas, while maintaining a pilot light and the flow rate of the supporting gas so that the nozzle tip does not glow. | 03-28-2013 |
| 20130091900 | POROUS GLASS MATRIX PRODUCING BURNER AND POROUS GLASS MATRIX PRODUCING METHOD - Provided is a porous glass matrix producing burner | 04-18-2013 |
| 20130133378 | METHOD FOR PRODUCING SYNTHETIC QUARTZ GLASS - A known method for producing synthetic quartz glass comprises the method steps: providing a liquid SiO | 05-30-2013 |
| 20140144188 | GLASS BASE MATERIAL MANUFACTURING APPARATUS AND METHOD THEREOF - An apparatus for manufacturing a glass base material, which is a base material of an optical fiber, the glass base material having a core rod as a central axis, comprises a holding unit having a plurality of scroll chucks connected in series along the core rod for holding an end of the core rod; and a burner that hydrolyzes a gas material, which is a base material of the glass base material, into glass particles and accumulates the glass particles around the core rod to form the glass base material. | 05-29-2014 |
| 20140165656 | METHOD OF FABRICATING AN OPTICAL FIBER PREFORM AND A BURNER THEREFOR - A method of fabricating an optical fiber preform, capable of depositing glass particles with high deposition rate without reducing deposition efficiency and fabricating an optical fiber preform having little bubbles using a burner having a simple structure, is provided. In the invention, a mixed gas of a glass raw material gas with a combustion assisting gas is ejected from an annular nozzle of a burner having a coaxially multiple tube structure, and a burnable gas is ejected from an inner nozzle located inside the annular nozzle. Alternatively, a mixed gas of a glass raw material gas with a burnable gas may be ejected from an annular nozzle, and a combustion assisting gas is ejected from an inner nozzle located inside the annular nozzle. In each case of the above, the burnable gas and the combustion assisting gas, respectively, are ejected from outer nozzles located outside the annular nozzle. | 06-19-2014 |
| 20140338400 | METHOD FOR MANUFACTURING SOOT GLASS DEPOSIT BODY AND BURNER FOR MANUFACTURING SOOT GLASS DEPOSIT BODY - A soot glass deposit body is manufactured by placing a starting rod and a burner | 11-20-2014 |
| 20150329403 | METHOD OF MANUFACTURING PREFORMS FOR OPTICAL FIBRES HAVING LOW WATER PEAK - A method of manufacturing at least one optical fibre preform comprising: providing a plurality of partially porous intermediate preforms, each partially porous intermediate preform having a longitudinal axis and comprising a respective soot intermediate clad layer formed around a respective glass core rod comprising a central core region of radius a and an inner clad region of radius b to define a first core-to-clad ratio a/b; consolidating the formed soot intermediate clad layers to form a respective plurality of intermediate glass preforms, each of the plurality of intermediate glass preforms comprising an intermediate clad region having an external radius c to define a second core-to-clad ratio a/c of from 0.20 to 0.30, and overcladding at least one intermediate glass preform by forming an overclad region surrounding the intermediate clad region to form an optical fibre glass preform, wherein consolidating comprises exposing the plurality of intermediate preforms to a consolidation hot zone of a single furnace body while rotating each of the intermediate preforms about its respective longitudinal axis. | 11-19-2015 |
| 20150336840 | METHOD OF MANUFACTURING PREFORMS FOR OPTICAL FIBRES HAVING LOW WATER PEAK - A method of manufacturing an optical fibre preform comprising: providing a glass core rod comprising a central core region of radius a and an inner clad region of external radius b to define a first core-to-clad ratio a/b; forming an intermediate glass preform comprising an intermediate clad region surrounding the inner clad region of the glass rod and having an external radius c to define a second core-to-clad ratio a/c, and overcladding the intermediate glass preform by forming an overclad region surrounding the intermediate clad region to form an optical fibre preform, wherein the first core-to-clad ratio a/b is equal to or less than 0.40 and the second core-to-clad ratio a/c is of from 0.20 to 0.25. | 11-26-2015 |
| 20160176749 | OPTICAL FIBER BASE MATERIAL MANUFACTURING APPARATUS | 06-23-2016 |
| 20160200622 | Enhanced Particle Deposition System and Method | 07-14-2016 |
| 065422000 | With dehydration (e.g., OH removal, etc.) | 4 |
| 20100307197 | Method for producing a cylinder from synthetic quartz glass - A known method for producing synthetic quartz glass comprises the method steps: (a) forming a cylindrical SiO | 12-09-2010 |
| 20110167874 | METHODS FOR MANUFACTURING LOW WATER PEAK OPTICAL WAVEGUIDE INCORPORATING A POROUS CORE MANDREL - A method of manufacturing a cylindrical glass optical waveguide preform having a low water content centerline region, for use in the manufacture of optical waveguide fiber, is disclosed. The centerline region of the glass optical waveguide preform has a water content sufficiently low such that an optical waveguide fiber producible from the glass optical waveguide preform of the present invention exhibits an optical attenuation of less than about 0.35 dB/km, and preferably less than about 0.31 dB/km, at a measured wavelength of 1380 nm. Method of manufacture of a porous core mandrel used in the manufacture of such a glass optical waveguide preform is also disclosed. | 07-14-2011 |
| 20120297837 | METHOD FOR PRODUCING GLASS PREFORM - Provided is a method for manufacturing glass preforms which is suitable for making an optical fiber having a less transmission loss in the wavelength band of 1.38 μm. The glass-preform manufacturing method of the present invention enables making a glass preform through a fixing step, a deposition step, an extraction step, a vitrification step, and a collapsing step in the named order. At the vitrification step, a glass soot body | 11-29-2012 |
| 20130025326 | METHODS FOR MANUFACTURING LOW WATER PEAK OPTICAL WAVEGUIDE - Methods are disclosed for manufacturing a cylindrical glass optical waveguide preform having low water content for use in the manufacture of optical waveguide fiber. The glass optical waveguide preform has a water content sufficiently low such that an optical waveguide fiber producible from the glass optical waveguide preform exhibits an optical attenuation of less than about 0.35 dB/km, and preferably less than about 0.31 dB/km, at a measured wavelength of 1380 nm. Methods are also disclosed for manufacturing glass preforms used in the manufacture of such a glass optical waveguide preform that combine the vapor axial deposition (VAD) and outside vapor deposition (OVD) techniques. | 01-31-2013 |
