Patent application number | Description | Published |
20090100876 | METHOD OF MANUFACTURING OPTICAL FIBER BASE MATERIAL AND APPARATUS OF THE SAME - A method of manufacturing an optical fiber base material includes: forming a porous glass base material by depositing glass particles; providing a synthetic quartz glass vessel at least partly made of quartz glass which contains aluminum equal to or less than 0.01 ppm; introducing dehydration reaction gas and inert gas into the vessel; heating a portion made of quartz glass which contains aluminum equal to or less than 0.01 ppm in the vessel that contains the dehydration reaction gas and the inert gas; and inserting the porous glass base material into the heated vessel to dehydrate and sinter the porous glass base material. | 04-23-2009 |
20090211302 | METHOD OF MANUFACTURING OPTICAL FIBER BASE MATERIAL AND APPARATUS OF THE SAME - A method of manufacturing an optical fiber base material includes: forming a porous glass base material by depositing glass particles; providing a vessel which employs a composite tube, the composite tube including a portion formed by jacketing a first quartz glass containing aluminum equal to or less than 0.01 ppm with a second quartz glass containing aluminum equal to or more than 15 ppm; introducing dehydration reaction gas and inert gas into the vessel; heating the jacketed portion in the vessel which contains the dehydration reaction gas and the inert gas; and inserting the porous glass base material into the heated vessel to dehydrate and sinter the porous glass base material. | 08-27-2009 |
20100011813 | QUARTZ GLASS MANUFACTURING METHOD AND QUARTZ GLASS MANUFACTURING APPARATUS - Provided is a quartz glass manufacturing method that involves using one or more burners, supplying hydrogen and oxygen to the one or more burners to generate an oxyhydrogen flame, introducing a silicide into the oxyhydrogen flame, forming a porous base material by depositing silicon dioxide generated from a flame hydrolysis reaction with the silicide, and heating and sintering the porous base material to form transparent glass, the method comprising supplying hydrogen that is stored or made at a normal temperature to the one or more burners; controlling a hydrogen flow rate using a measurement apparatus or control apparatus that performs measurement based on heat capacity of a gas; vaporizing liquid hydrogen stored in a low-temperature storage chamber, and supplying the vaporized liquid hydrogen to the one or more burners as backup hydrogen; switching from the hydrogen to the backup hydrogen; and when switching, adjusting the hydrogen flow rate to a value obtained by multiplying the hydrogen flow rate immediately after switching by a predetermined correction coefficient. | 01-21-2010 |
20100015038 | HYDROGEN SUPPLY EQUIPMENT - Provided is hydrogen supply equipment that, when switching hydrogen supplied to equipment using hydrogen from (i) hydrogen produced at a normal temperature or hydrogen stored at a normal temperature to (ii) hydrogen stored at a low temperature, supplies the equipment using hydrogen with normal hydrogen obtained by returning the hydrogen at the low temperature to a normal temperature and then passing this hydrogen through equipment for accelerating a conversion from parahydrogen to orthohydrogen. | 01-21-2010 |
20100154480 | METHOD OF MANUFACTURING OPTICAL FIBER BASE MATERIAL - A method of manufacturing an optical fiber base material having very little impurity which deteriorates the transmission characteristic of an optical fiber is provided. The method of manufacturing an optical fiber base material including: producing a core member for the optical fiber base material by dehydrating and transparently vitrifying a base material formed by depositing glass particles; and drawing the core member and then adding a cladding thereto at a desired core to cladding ratio, wherein the dehydrating includes suspending the base material in a furnace tube having a heating region in a first atmosphere at a first temperature, the base material passing through the heating region as upwardly moving, and the transparently vitrifying includes situating the base material below once and then allowing the base material to pass through the heating region in a second atmosphere at a second temperature as upwardly moving again. | 06-24-2010 |
20100209859 | APPARATUS AND METHOD FOR SUPPLYING HYDROGEN GAS, AND QUARTZ GLASS MANUFACTURING APPARATUS - There is provided an apparatus for supplying a hydrogen gas to a quartz glass manufacturing apparatus including a burner that generates an oxyhydrogen flame when supplied with the hydrogen gas, where the apparatus includes: a first hydrogen supply system that supplies a hydrogen gas in which isotopes are in equilibrium; a second hydrogen supply system that supplies a hydrogen gas in which isotopes are out of equilibrium; a flow rate control section that includes: a valve that changes a flow rate of the hydrogen gas to be supplied to the burner; a first flow rate measuring section that measures the flow rate of the hydrogen gas to be supplied to the burner by measuring a heat capacity; and a control section that controls the valve in such a manner that a measured value obtained by the first flow rate measuring section approaches a set value input from outside; a second flow rate measuring section that measures the flow rate of the hydrogen gas to be supplied to the burner by measuring a different factor than the heat capacity; and a set value compensating section that compensates the set value by multiplying the set value by a ratio between the measured value obtained by the first flow rate measuring section and a measured value obtained by the second flow rate measuring section. | 08-19-2010 |
20110107797 | OPTICAL FIBER PREFORM MANUFACTURING METHOD AND OPTICAL FIBER PREFORM MANUFACTURING DEVICE - An optical fiber base material manufacturing method includes: supplying oxygen, hydrogen, and silicide to a core deposition burner; depositing silicon dioxide; adjusting a drawing up speed so that a deposition tip position remains at the same position in accordance with growth of a porous base material; calculating an average of the drawing up speed at each preset time interval; calculating a difference of the calculated average from a preset value of the drawing up speed; correcting a flow rate of silicon tetrachloride when the supplied hydrogen is hydrogen produced or stored at normal temperature, and correcting a flow rate of hydrogen when the supplied hydrogen is hydrogen obtained by vaporizing liquid hydrogen, where when correcting the flow rate of hydrogen, a flow rate of hydrogen supplied to a cladding deposition burner is also corrected in a ratio of before and after the correction of the flow rate of the hydrogen. | 05-12-2011 |
20120186303 | OPTICAL FIBER AND METHOD OF MANUFACTURING OPTICAL FIBER PREFORM - A method for manufacturing an optical fiber preform that includes preparing a glass cylinder with inner and outer surfaces forming at least part of a cladding portion are repeatedly polished, and a glass core rod that includes a core portion having a higher refractive index than the cladding portion; and inserting the core rod into the glass cylinder and heating the glass cylinder and core rod to form a single body. The repeated polishing of the inner surface of the glass cylinder includes passing pure water that does not contain a cutting fluid over the inner surface for at least the final polishing. The polishing is preferably performed using a polishing cloth to which are affixed diamond abrasive grains. The glass core rod and the glass cylinder are preferably formed of composite quartz glass. | 07-26-2012 |
20120304701 | MANUFACTURING METHOD OF OPTICAL FIBER BASE MATERIAL POSSESSING LOW REFRACTIVE INDEX PORTION DISTANTLY-POSITIONED FROM CORE - Provided is a method for manufacturing an optical fiber base material, comprising manufacturing a soot deposition body having a core with a high refractive index at a center thereof, using VAD or OVD; dehydrating the soot deposition body within a heating furnace, with a temperature that does not vitrify the soot deposition body and in a helium atmosphere containing chlorine; after the dehydration, forming a core rod by vitrifying the soot deposition body at a temperature that vitrifies the soot deposition body, in a helium atmosphere; and applying cladding on the outside of the core rod. The helium atmosphere in the heating furnace when vitrifying the soot deposition body includes a gas containing a fluorine compound, and concentration of the fluorine in the atmospheric gas is in a range of 0.1 mol % to 10 mol %. | 12-06-2012 |
20130279867 | OPTICAL FIBER - In order to decrease transmission loss caused by Rayleigh scattering in an optical fiber, without negatively affecting the curvature loss, provided is an optical fiber comprising a core at a center thereof, a low refractive index layer that is adjacent to the core and covers an outer circumference of the core, and a cladding that is adjacent to the low refractive index layer and covers an outer circumference of the low refractive index layer, wherein a refractive index of the core is higher than a refractive index of the cladding, a refractive index of the low refractive index layer is lower than the refractive index of the cladding, and the refractive index of the low refractive index layer decreases in a direction from an inner portion of the low refractive index layer to an outer portion of the low refractive index layer. | 10-24-2013 |
20130291602 | OPTICAL FIBER PREFORM MANUFACTURING METHOD - In an optical fiber preform manufacturing method including: exposing a soot-deposited object to a high temperature of 1000 to 1300° C. in a chlorine-containing atmosphere to dehydrate the soot-deposited object, the soot-deposited object being formed by deposition of silicon dioxide soot; and vitrifying the soot-deposited object into a transparent glass by exposing the soot-deposited object to a high temperature of 1300 to 1600° C. in an atmosphere containing inert gas and fluorine compound gas, but not containing oxygen, the fluorine compound gas does not contain carbon. | 11-07-2013 |
20130298611 | METHOD OF MANUFACTURING OPTICAL FIBER BASE MATERIAL AND APPARATUS OF THE SAME - A method of manufacturing an optical fiber base material includes: forming a porous glass base material by depositing glass particles; providing a synthetic quartz glass vessel at least partly made of quartz glass which contains aluminum equal to or less than 0.01 ppm; introducing dehydration reaction gas and inert gas into the vessel; heating a portion made of quartz glass which contains aluminum equal to or less than 0.01 ppm in the vessel that contains the dehydration reaction gas and the inert gas; and inserting the porous glass base material into the heated vessel to dehydrate and sinter the porous glass base material. | 11-14-2013 |
20140283557 | QUARTZ GLASS MANUFACTURING METHOD USING HYDROGEN OBTAINED BY VAPORIZING LIQUID HYDROGEN - Provided is a quartz glass manufacturing method that involves using one or more burners, supplying hydrogen and oxygen to the one or more burners to generate an oxyhydrogen flame, introducing a silicide into the oxyhydrogen flame, forming a porous base material by depositing silicon dioxide generated from a flame hydrolysis reaction with the silicide, and heating and sintering the porous base material to form transparent glass, the method comprising supplying hydrogen that is stored or made at a normal temperature to the one or more burners; controlling a hydrogen flow rate using a measurement apparatus or control apparatus that performs measurement based on heat capacity of a gas; vaporizing liquid hydrogen stored in a low-temperature storage chamber, and supplying the vaporized liquid hydrogen to the one or more burners as backup hydrogen; switching from the hydrogen to the backup hydrogen; and when switching, adjusting the hydrogen flow rate to a value obtained by multiplying the hydrogen flow rate immediately after switching by a predetermined correction coefficient. | 09-25-2014 |
20140308621 | SINTERING APPARATUS - A sintering apparatus comprising a furnace core tube having an opening in a top end through which the soot deposition body is inserted, and having atmospheric gas introduced therein from below and expelled upward; a shaft from which the soot deposition body hangs; a lid that has the shaft inserted therethrough and can cover the opening; a heating furnace that heats the soot deposition body; an internal lid in a top portion of the furnace core tube that divides the top portion of the furnace core tube into an upper region and a lower region; and a gas flow path that connects the two regions to each other and has the atmospheric gas flow therethrough. Total cross-sectional area, relative to movement direction of the atmospheric gas, of the gas flow path is less than cross-sectional area, relative to movement direction of the atmospheric gas, of the furnace core tube. | 10-16-2014 |
Patent application number | Description | Published |
20120247820 | RESIN COMPOSITION, PREPREG LAMINATE OBTAINED WITH THE SAME AND PRINTED-WIRING BOARD - Disclosed are a resin composition containing (a) a maleimide compound having at least two N-substituted maleimide groups in a molecular structure and (b) a silicone compound having at least one reactive organic group in a molecular structure thereof; and a prepreg using the same, a laminate, and a printed wiring board. | 10-04-2012 |
20130008695 | VARNISH, PREPREG, FILM WITH RESIN, METAL FOIL-CLAD LAMINATE, AND PRINTED CIRCUIT BOARD - The invention provides a varnish produced through reaction between a compound having an amino group and a resin having a functional group capable of reacting with an amino group, and having a polycyclic structure, wherein a portion of a plurality of the functional group of the resin is caused to react with the amino group of the compound in a solvent, and also a varnish produced through reaction between a compound having a phenolic hydroxyl group and a resin having a functional group capable of reacting with a phenolic hydroxyl group, and having a polycyclic structure, wherein a portion of a plurality of the functional group of the resin is caused to react with the phenolic hydroxyl group of the compound in the solvent. The invention also provides a prepreg, a resin-coated film, a metal-foil-clad laminate, and a printed wiring board produced by use of any of the varnishes. | 01-10-2013 |
20130330563 | MODIFIED SILICONE COMPOUND, AND THERMOSETTING RESIN COMPOSITION, PREPREG, LAMINATE PLATE AND PRINTED WIRING BOARD USING SAME - There are provided a modified silicone compound prepared by reacting: (A) a siloxane diamine represented by the general formula (1); (B) a maleimide compound with at least two N-substituted maleimide groups in the molecular structure; and (C) an amine compound with an acidic substituent; and also provided a thermosetting resin composition, a prepreg, a laminated plate, and a printed wiring board that are formed by using this compound. The multi-layered printed wiring board produced by using the laminated plate formed by using the prepreg obtained from the modified silicone compound and the thermosetting resin composition of the present invention through laminate molding has an excellent glass transition temperature, coefficient of thermal expansion, copper foil adhesion, hygroscopicity, hygroscopic solder heat resistance, and copper-stuck solder heat resistance. Therefore, the multi-layered printed wiring board is useful as a highly integrated semiconductor package and a printed wiring board for an electronic device. | 12-12-2013 |
20140000948 | RESIN COMPOSITION, AND PRINTED WIRING BOARD, LAMINATED SHEET, AND PREPREG USING SAME | 01-02-2014 |