公开(公告)号：US20240092681A1

公开(公告)日：2024-03-21

申请号：US18470455

申请日：2023-09-20

Applicant: Shin-Etsu Chemical Co., Ltd.

Inventor： Yuhei URATA

IPC: C03B37/014

CPC classification number: C03B37/0146 ,  C03B37/0142 ,  C03B37/01486

Abstract: In the process comprising manufacturing a glass fine particle deposit (soot) by injecting glass fine particles generated with a burner for glass fine particle synthesis to a starting material rotating around its central axis as an axis of rotation; and sintering the glass fine particle deposit to vitrify it into transparent glass by suspending and heating the glass fine particle deposit in a furnace core tube, it is characterized that a product of a time period (min) during which a part of the glass fine particle deposit is heated in a heating zone in the furnace core tube and a linear speed (m/min) of sintering gas flowing in the furnace core tube is 15.5 (m) or more.

公开(公告)号：US20250066239A1

公开(公告)日：2025-02-27

申请号：US18940918

申请日：2024-11-08

Applicant: Shin-Etsu Chemical Co., Ltd.

Inventor： Yuhei URATA

IPC: C03B37/018

Abstract: An optical fiber preform, when manufactured by manufacturing a core glass preform composed of a core portion and a part of a clad portion, and then providing a remaining part of the clad portion on outside of the core glass preform, is characterized in that, in the core glass preform, a radial position where a relative refractive index difference has a value which is 0.45 times the relative refractive index difference at a core center is defined as a core radial position, then there is, in a range of 5% inside the core radial position, a location where the relative refractive index difference exhibits a locally high local maximum value ΔM and a location where the relative refractive index difference exhibits a locally low local minimum value Δm, and a value of ΔM−Δm does not exceed 0.04%.

公开(公告)号：US20220009816A1

公开(公告)日：2022-01-13

申请号：US17367649

申请日：2021-07-06

Applicant: Shin-Etsu Chemical Co., Ltd.

Inventor： Yuhei URATA

IPC: C03B37/018

Abstract: The present invention provides an optical fiber with improved optical properties such as zero dispersion wavelength by suppressing the volatilization of dopant materials such as germanium dioxide and optimizing the refractive index distribution by adjusting the setting position of the core portion burner for deposition in a larger optical fiber preform. An optical fiber preform includes a core portion with a relatively high refractive index and a clad portion with a relatively low refractive index, wherein a position having a value of 45% of a refractive index difference between a center of the core portion and the clad portion is a boundary rcore (mm) between the core portion and the clad portion; and when a radius position r at which a refractive index difference with the clad portion being a maximum value is rside (mm), rside/rcore is 0.745 to 1.

公开(公告)号：US20190292087A1

公开(公告)日：2019-09-26

申请号：US16361235

申请日：2019-03-22

Applicant: Shin-Etsu Chemical Co., Ltd.

Inventor： Yuhei URATA

IPC: C03B37/012

Abstract: An optical fiber preform manufacturing apparatus comprising a seal member, wherein the seal member is attached to a flange portion formed in an open portion of a reaction chamber into which a burner is inserted, the seal member includes a first sheet that is flexible and includes an open portion that is smaller than an outer diameter of the burner, through which the burner is inserted; a second sheet having the same thickness as the first sheet and including an open portion that is larger than an outer diameter of the first sheet; and two third sheets that each include an open portion that is larger than the outer diameter of the burner and smaller than the outer diameter of the first sheet, the second sheet is arranged in the same plane as the first sheet, and the first and second sheets are sandwiched by the two third sheets.

公开(公告)号：US20180029921A1

公开(公告)日：2018-02-01

申请号：US15659998

申请日：2017-07-26

Applicant: Shin-Etsu Chemical Co., Ltd.

Inventor： Yuhei URATA

IPC: C03B37/014 ,  C03B19/14 ,  C03B19/06

CPC classification number: C03B37/01446 ,  C03B19/06 ,  C03B19/1453 ,  C03B2201/31 ,  C03B2207/20 ,  Y02P40/57

Abstract: Provided is a method for producing a glass preform for optical fiber which suppresses occurrences of cracks, coloring and foaming in a surface layer when sintering a glass fine particle deposit to allow a production yield to be improved. A method for producing a glass preform for optical fiber comprising the steps of: spraying glass fine particles containing silicon dioxide and germanium dioxide to a starting material moving upward while rotating to produce a glass fine particle deposit; and sintering the glass fine particle deposit while relatively varying a positional relationship between a heating source and the glass fine particle deposit in a sintering apparatus to produce a transparent glass preform, wherein a germanium dioxide reducing gas is contained in an atmosphere gas in the sintering apparatus.

公开(公告)号：US20160289113A1

公开(公告)日：2016-10-06

申请号：US15090620

申请日：2016-04-05

Applicant: Shin-Etsu Chemical Co., Ltd.

Inventor： Makoto YOSHIDA ,  Yuhei URATA ,  Yuichi MATSUNAGA

IPC: C03B37/07 ,  C03B37/018

CPC classification number: C03B37/01486 ,  C03B37/0142 ,  C03B2203/23 ,  C03B2207/36 ,  C03B2207/50 ,  C03B2207/64 ,  C03B2207/66 ,  C03B2207/70

Abstract: In a device for producing a large-sized porous base material by a VAD process, the cracking and variation of the outer diameter of the base material are suppressed by forming a smooth tapered part, without changing the length of a non-effective part. In producing the porous base material by a VAD process, the time for a gas to reach a flow amount of the gas in a steady state from starting of the deposition is extended more in a burner that deposits glass microparticles on a layer closer to the outside of the base material.

Abstract translation: 在通过VAD工艺生产大尺寸多孔基材的装置中，通过形成平滑的锥形部分来抑制基材的外径的破裂和变化，而不改变非有效部分的长度。 在通过VAD工艺生产多孔基材时，气体从沉积开始到达稳定状态的气体的流动时间在更加靠近外部的层中的玻璃微粒的燃烧器中延伸得更多 的基材。

公开(公告)号：US20140090426A1

公开(公告)日：2014-04-03

申请号：US14034571

申请日：2013-09-24

Applicant: Shin-Etsu Chemical Co., Ltd.

Inventor： Yuhei URATA

IPC: C03B37/014

CPC classification number: C03B37/01413 ,  C03B37/0142 ,  C03B2203/23 ,  C03B2207/50 ,  C03B2207/70 ,  C03B2207/80 ,  Y02P40/57

Abstract: Provided is a method of manufacturing a porous glass deposition body for optical fiber comprising depositing silica powder on a starting member being raised and rotated by using burners with different deposition positions. With a glass raw material flow rate supplied to a core deposition burner represented by F1 and a total flow rate of glass raw material supplied to a cladding deposition burner adjacent to the core deposition burner represented by F2, during an initial deposition stage occurring before gas conditions reach a stable state, glass raw material is supplied to points at the same longitudinal position of the deposition body such that a glass raw material flow rate ratio F2/F1 is no less than 0.69 and no greater than 1.03.

Abstract translation: 本发明提供一种制造光纤用多孔玻璃沉积体的方法，其特征在于，使用具有不同沉积位置的燃烧器将二氧化硅粉末沉淀在起始构件上并使之旋转。 将供给到由F1表示的核心沉积燃烧器的玻璃原料流量和供给到由F2表示的芯沉积燃烧器附近的包层沉积燃烧器的玻璃原料的总流量，在气体条件下发生的初始沉积阶段期间 达到稳定状态，将玻璃原料供给到沉积体的相同纵向位置处的点，使得玻璃原料流量比F2 / F1不小于0.69且不大于1.03。

公开(公告)号：US20210215473A1

公开(公告)日：2021-07-15

申请号：US17213213

申请日：2021-03-25

Applicant: Shin-Etsu Chemical Co., Ltd.

Inventor： Yuhei URATA

IPC: G01B11/08 ,  C03B37/018 ,  G02B6/028 ,  G01B11/24

Abstract: A method of measuring a diameter of a core portion of an optical fiber preform including the core portion having a relatively high refractive index and a clad portion having a relatively low refractive index. The method includes applying parallel light to the optical fiber preform, and measuring the diameter of the core portion from an image captured by receiving the light having transmitted through the optical fiber preform.

公开(公告)号：US20200255321A1

公开(公告)日：2020-08-13

申请号：US16788603

申请日：2020-02-12

Applicant: SHIN-ETSU CHEMICAL CO., LTD.

Inventor： Yuhei URATA

IPC: C03B37/014

Abstract: A method of manufacturing an optical fiber glass base material includes storing a glass particulate deposit prepared through a vapor-phase axial deposition (VAD) method in a storage chamber, wherein a hydrogen chloride concentration in the storage chamber is maintained at 2 ppm or lower, and a humidity in the storage chamber is preferably maintained at 12 g/m3 or lower. The storage chamber has an air supply port and an exhaust port, and a gas discharged from the exhaust port is re-supplied from the supply port into the storage chamber using a blower fan. A chemical filter is provided between the exhaust port and the blower fan. A dehumidifier is preferably provided between the exhaust port and the blower fan.

公开(公告)号：US20190106351A1

公开(公告)日：2019-04-11

申请号：US16149634

申请日：2018-10-02

Applicant: SHIN-ETSU CHEMICAL CO., LTD.

Inventor： Yuhei URATA ,  Hiroki KOJIMA

IPC: C03B37/014

CPC classification number: C03B37/014 ,  C03B37/0142 ,  C03B2207/06 ,  C03B2207/20 ,  C03B2207/22 ,  C03B2207/24 ,  C03B2207/36 ,  C03B2207/50

Abstract: A method is provided for producing a glass fine particle deposit by a VAD method using a core deposition burner and a cladding deposition burner disposed adjacent to the core deposition burner. The cladding deposition burner including five cylindrical tubes having different outer diameters and concentrically superimposed on one another and a group of small-diameter nozzles arranged in a ring shape in a third region from the inner side. The method includes flowing, in the cladding deposition burner, a glass raw material gas and a combustion supporting gas in a first region from the inner side, air in a second region from the inner side, a combustible gas in the third region from the inner side, a combustion supporting gas in the group of small-diameter nozzles, an inert gas in a fourth region from the inner side, and a combustion supporting gas in a fifth region from the inner side, respectively.