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1. 发明申请

US20220293825A1 METHOD OF MANUFACTURING OPTICAL SEMICONDUCTOR DEVICE AND OPTICAL SEMICONDUCTOR DEVICE 有权
公开(公告)号：US20220293825A1
公开(公告)日：2022-09-15
申请号：US17754113
申请日：2020-09-18
申请人： DOWA Electronics Materials Co., Ltd.
发明人： Tsukasa MARUYAMA , Takashi ARAKI , Takehiro MIYAJI
IPC分类号： H01L33/48 , H01L33/62
摘要： The method of manufacturing an optical semiconductor device includes: a mounting step of placing an optical semiconductor chip on a package substrate made of ceramic; a storing step of storing the package substrate after the mounting step in a first dry atmosphere; a placing step of subjecting the optical semiconductor chip on the package substrate to a second dry atmosphere and placing a light transparent window on a joint portion of the package substrate with a joint material therebetween; and a sealing step of joining the joint portion and the light transparent window with the joint material in a low oxygen concentration atmosphere having an oxygen concentration of 1 vol % or less, thereby encapsulating the optical semiconductor chip in a confined space formed by the package substrate and the light transparent window.

2. 发明授权

US11420256B2 Silver powder and method for producing same 有权
公开(公告)号：US11420256B2
公开(公告)日：2022-08-23
申请号：US16648423
申请日：2018-09-18
申请人： DOWA ELECTRONICS MATERIALS CO., LTD.
发明人： Yoshiyuki Michiaki , Masahiro Yoshida , Kenichi Inoue
IPC分类号： B22F1/10 , B22F9/08 , B22F1/05 , C22C5/08 , C23C2/28
摘要： A silver powder which has a small content of carbon and which is difficult to be agglutinated, and a method for producing the same. While a molten metal, which is prepared by melting silver to which 40 ppm or more of copper is added, is allowed to drop, a high-pressure water is sprayed onto the molten metal to rapidly cool and solidify the molten metal to produce a silver powder which contains 40 ppm or more of copper, 0.1% by weight or less of carbon and 0.1% by weight or less of oxygen and wherein the particle diameter (D50 diameter) corresponding to 50% of accumulation in volume-based cumulative distribution of the silver powder, which is measured by means of a laser diffraction particle size analyzer, is in the range of from 1 μm to 15 μm, the average particle diameter (SEM diameter) of single particles being in the range of from 1 μm to 8 μm when it is measured by means of a field emission scanning electron microscope (SEM), the ratio (SEM diameter/D50 diameter) of the SEM diameter to the D50 diameter being in the range of from 0.3 to 1.0.

3. 发明授权

US11417793B2 Method of manufacturing semiconductor optical device and semiconductor optical device 有权
公开(公告)号：US11417793B2
公开(公告)日：2022-08-16
申请号：US16831804
申请日：2020-03-27
申请人： DOWA Electronics Materials Co., Ltd.
发明人： Jumpei Yamamoto , Tetsuya Ikuta
IPC分类号： H01L33/00 , H01L33/30 , H01L33/06 , H01L33/10 , H01L33/38 , H01L33/40
摘要： Provided is a method of manufacturing a semiconductor optical device, which makes it possible to reduce the thickness of a semiconductor optical device including InGaAsP-based III-V compound semiconductor layers containing at least In and P to a thickness smaller than that of conventional devices, and provide a semiconductor optical device. The method of manufacturing a semiconductor optical device includes a step of forming a semiconductor laminate on the InP growth substrate; a step of bonding the semiconductor laminate to the support substrate formed from a Si substrate, with at least the metal bonding layer therebetween; and a step of removing the InP growth substrate.

4. 发明申请

US20220243086A1 SILVER POWDER AND METHOD FOR PRODUCING SAME 有权
公开(公告)号：US20220243086A1
公开(公告)日：2022-08-04
申请号：US17621896
申请日：2020-06-16
申请人： DOWA ELECTRONICS MATERIALS CO., LTD.
发明人： Masanori Fujii
IPC分类号： C09D11/52 , C09D11/033 , C09D11/037 , C09D11/14 , B22F1/052 , H01B1/22 , H01B13/00
摘要： There are provided a silver powder, which is able to form an electrically conductive film having a lower resistance value than that of conventional electrically conductive films when the silver powder is used as the material of an electrically conductive paste which is fired to form the electrically conductive film, and a method for producing the same. A first silver powder having one peak or more, at each of which a frequency is a local maximum value in a volume-based particle size distribution obtained by measuring the first silver powder in a dry process by means of a laser diffraction particle size analyzer, is mixed with a second silver powder having two peaks or more, at each of which a frequency is a local maximum value in a volume-based particle size distribution obtained by measuring the second silver powder in a dry process by means of a laser diffraction particle size analyzer, to produce a silver powder having three peaks or more, at each of which a frequency is a local maximum value in a volume-based particle size distribution obtained by measuring the silver powder in a dry process by means of a laser diffraction particle size analyzer, the silver powder having one peak, at which a frequency is a local maximum value in a volume-based particle size distribution obtained by measuring the silver powder in a wet process by means of a laser diffraction scattering particle size analyzer.

5. 发明申请

US20220089456A1 SUBSTITUTION-TYPE EPSILON-IRON OXIDE MAGNETIC PARTICLE POWDER, METHOD FOR PRODUCING SUBSTITUTION-TYPE EPSILON-IRON OXIDE MAGNETIC PARTICLE POWDER, GREEN COMPACT, METHOD FOR PRODUCING GREEN COMPACT, AND ELECTROMAGNETIC WAVE 有权
公开(公告)号：US20220089456A1
公开(公告)日：2022-03-24
申请号：US17433672
申请日：2020-02-28
申请人： DOWA ELECTRONICS MATERIALS CO., LTD.
发明人： Tatsuro HORI , Daisuke KODAMA , Shiho OBATA , Masahiro GOTOH
IPC分类号： C01G51/00 , C08K3/22 , H01F1/34 , H05K9/00
摘要： A substitution-type ε-iron oxide magnetic particle powder having a reduced content of a non-magnetic α-type iron-based oxide and Fe sites of ε-Fe2O3 partially substituted by another metal element is obtained by neutralizing an acidic aqueous solution containing a trivalent iron ion and an ion of a metal that partially substitutes Fe sites to a pH of 2.0 or higher and 7.0 or lower. A silicon compound having a hydrolyzable group is added to a dispersion liquid containing an iron oxyhydroxide having a substituent metal element or a mixture of an iron oxyhydroxide and a hydroxide of a substituent metal element. The dispersion liquid is neutralized to a pH of 8.0 or higher and the iron oxyhydroxide having a substituent metal element or the mixture of the iron oxyhydroxide and the hydroxide of a substituent metal element is coated with a chemical reaction product of the silicon compound and then heated.

6. 发明授权

US11264155B2 Epsilon-type iron oxide magnetic particles and method for producing the same, magnetic powder, magnetic coating material and magnetic recording medium containing magnetic particles 有权
公开(公告)号：US11264155B2
公开(公告)日：2022-03-01
申请号：US16337195
申请日：2017-09-29
申请人： DOWA ELECTRONICS MATERIALS CO., LTD.
发明人： Kazuhiro Yamaga , Tetsuya Kawahito , Toshihiko Ueyama , Kenji Sakane
IPC分类号： H01F1/11 , C01G49/06 , G11B5/842 , G11B5/714 , G11B5/706 , C01G49/00 , B82Y25/00
摘要： An object of the present invention is to provide a magnetic powder having a narrow particle size distribution of epsilon-type iron oxide particles, and another object is to provide magnetic powder suitable for magnetic recording medium by improving particle size distribution, and provide epsilon-type iron oxide magnetic particles and related technologies in which a number average particle diameter of major diameters (D50) is 10 to 20 nm, a 90% cumulative particle diameter (D90) is 30 nm or less, and a geometric standard deviation (σg) of major diameters is 1.45 or less, which are obtained by TEM observation.

7. 发明授权

US11201261B2 Deep ultraviolet light emitting element and method of manufacturing the same 有权
公开(公告)号：US11201261B2
公开(公告)日：2021-12-14
申请号：US16482138
申请日：2018-02-14
申请人： DOWA Electronics Materials Co., Ltd.
发明人： Tomohiko Shibata
IPC分类号： H01L33/18 , H01L33/10 , H01L33/30 , H01L33/06 , H01L33/14 , H01L33/26
摘要： Provided are a deep ultraviolet light emitting element that exhibits both high light output power and an excellent reliability, and a method of manufacturing the same. A deep ultraviolet light emitting element 100 of this disclosure comprises an n-type semiconductor layer 30, a light-emitting layer 40, and a p-type semiconductor layers 60, on a substrate 10, in this order. The light-emitting layer 40 emits deep ultraviolet light. The p-type semiconductor layers 60 comprise a p-type first layer 60A and a p-type contact layer 60B directly on the p-type first layer 60A. The p-type contact layer 60B is made of a non-nitride p-type group III-V or p-type group IV semiconductor material, and functions as a reflective layer to reflect the deep ultraviolet light. The reflectance of light at a wavelength of 280 nm incident on the p-type contact layer 60B from the p-type first layer 60A is 10% or higher.

8. 发明授权

US11114228B2 Magnetic powder composite, antenna and electronic device, and method for producing the same 有权
公开(公告)号：US11114228B2
公开(公告)日：2021-09-07
申请号：US15578471
申请日：2016-06-01
申请人： DOWA ELECTRONICS MATERIALS CO., LTD.
发明人： Toshihiko Ueyama , Masahiro Gotoh , Takayuki Yoshida , Takuyuki Baba
IPC分类号： H01F1/26 , H01F1/11 , B22F1/00 , B22F1/02
摘要： A magnetic compound having a small dielectric loss and an antenna constituted by the magnetic compound and an electronic device incorporating the antenna are provided by a metal magnetic powder which is well dispersed in a resin having small dielectric loss, and a magnetic powder composite including: a metal magnetic powder; and one or more elements selected from carboxylic acid or its anhydride, aromatic carboxylic acid ester, and a derivative thereof, having a property that real part μ′ permeability is 1.45 or more, tan δμ is 0.1 or less, tan δε is 0.05 or less at a measuring frequency of 2 GHz, when a magnetic powder composite is prepared by adding 5 parts by mass of one or more elements selected from the carboxylic acid or its anhydride, the aromatic carboxylic acid ester, and the derivative thereof to 100 parts by mass of the metal magnetic powder.

9. 发明授权

US11103922B2 Fe—Co alloy powder and method for producing the same, and antenna, inductor and EMI filter 有权
公开(公告)号：US11103922B2
公开(公告)日：2021-08-31
申请号：US15129032
申请日：2015-03-27
申请人： DOWA ELECTRONICS MATERIALS CO., LTD.
发明人： Masahiro Gotoh , Takayuki Yoshida
IPC分类号： B22F1/00 , C22C38/00 , H01Q7/08 , H01Q9/04 , H01F1/26 , C22C38/10 , H01R13/719 , H01F1/24 , H01F1/33 , B22F9/26
摘要： A method for producing a Fe—Co alloy powder suitable for an antenna includes steps, wherein when introducing an oxidizing agent into an aqueous solution containing Fe ions and Co ions to generate crystal nuclei and cause precipitation and growth of a precursor having Fe and Co as components, Co in an amount corresponding to 40% or more of the total amount of Co used for the precipitation reaction is added to the aqueous solution at a time after the start of the crystal nuclei generation and before the end of the precipitation reaction to obtain the precursor. Then, a dried product of the precursor is reduced to obtain a Fe—Co alloy powder. This Fe—Co alloy powder has a mean particle size of 100 nm or less, a coercive force Hc of 52.0 to 78.0 kA/m, and a saturation magnetization ss of 160 Am2/kg or higher.

10. 发明授权

US11081253B2 Silver particle dispersing solution, method for producing same, and method for producing conductive film using silver particle dispersing solution 有权
公开(公告)号：US11081253B2
公开(公告)日：2021-08-03
申请号：US16347974
申请日：2017-06-11
申请人： Dowa Electronics Materials Co., Ltd.
发明人： Taku Okano , Noriaki Nogami
IPC分类号： H01B1/22 , B22F1/00 , C09D11/322 , C09D11/38 , C09D11/52 , C09D1/00 , H01B13/00 , C09D11/36 , B22F1/02 , H01B1/00 , C09C1/62 , C09D5/24 , B22F9/00 , C09C3/08
摘要： There is provided an inexpensive silver particle dispersing solution being usable as a slurry for ink jet, a method for producing the same, and a method for producing a conductive film using the silver particle dispersing solution. In a silver particle dispersing solution containing a silver powder and a solvent, the silver powder has an average primary particle diameter (DSEM) of 0.15 to 0.5 μm, and the ratio (D50/DSEM) of a particle diameter (D50), which corresponds to 50% of accumulation in volume-based cumulative distribution of the silver powder, to the average primary particle diameter (DSEM) is not less than 1.7, the silver powder having a fatty acid adhered to the surface thereof, and the solvent containing a monohydric higher alcohol having a carbon number of 6 to 12, butyl carbitol or butyl carbitol acetate as the main component thereof.

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