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    • 42. 发明授权
    • Dispersion compensator whose transmission band is flattened
    • 色散补偿器,其传输带平展
    • US06909537B2
    • 2005-06-21
    • US10340842
    • 2003-01-13
    • Yuichi KawahataNobuaki Mitamura
    • Yuichi KawahataNobuaki Mitamura
    • G02B5/28G02B5/22G02B6/34H01S3/00
    • G02B6/29358G02B6/29394
    • Light input from a single-mode fiber is collected into linear light beams by a line focuser, and collected on a VIPA element. A light beam output from the VIPA element is made to pass through a space filter having a predetermined transmission loss characteristic, and focused on a mirror with a focusing lens. The light is reflected by the mirror, again passes through the space filter via the focusing lens, enters the VIPA element, and again enters the single-mode fiber via the line focuser. The insertion loss wavelength characteristic of the wavelength dispersion compensator using the VIPA element is optimized by being superimposed on the transmission loss characteristic of the space filter.
    • 来自单模光纤的光输入由线聚焦器收集到线性光束中,并收集在VIPA元件上。 使从VIPA元件输出的光束通过具有预定的传输损耗特性的空间滤波器,并且聚焦在具有聚焦透镜的反射镜上。 光被镜子反射,再次通过聚焦透镜通过空间滤光片,进入VIPA元件,并再次通过线型聚焦器进入单模光纤。 使用VIPA元件的波长色散补偿器的插入损耗波长特性通过叠加在空间滤波器的传输损耗特性上被优化。
    • 43. 发明授权
    • Optical apparatus and device
    • 光学仪器和设备
    • US06900940B2
    • 2005-05-31
    • US10164438
    • 2002-06-10
    • Nobuaki MitamuraHirotomo IzumiYuichi Kawahata
    • Nobuaki MitamuraHirotomo IzumiYuichi Kawahata
    • G02B5/28G02B6/293G02B6/34G02B27/00G02B1/10
    • G02B6/29358G02B6/29394
    • A VIPA plate having a configuration where a translucent reflection film and a total reflection film are respectively arranged on one side and the other side of a transparent parallel plate can be used as a wavelength dispersion compensator by using a special mirror and a lens. However, the transparency characteristic of the wavelength dispersion compensator using such a VIPA plate is a periodical characteristic which is asymmetric with a central wavelength in a wavelength regime. Accordingly, not parallel light but converged or diverged light having angular dispersion is input to an etalon plate, so that a filter whose transparency characteristic is an asymmetric periodical characteristic which is reverse to the VIPA plate is configured for the central wavelength in the wavelength regime. With this filter, the transparency characteristic of the wavelength dispersion compensator using the VIPA plate is optimized.
    • 具有透明平行板的一侧和另一侧分别布置半透明反射膜和全反射膜的结构的VIPA板可以通过使用特殊镜和透镜用作波长色散补偿器。 然而,使用这种VIPA板的波长色散补偿器的透明度特性是与波长范围中的中心波长不对称的周期特性。 因此,不是平行光,而是具有角度色散的会聚或发散的光被输入到标准具板,使得其透明度特性是与VIPA板相反的不对称周期特性的滤光器被配置为波长范围中的中心波长。 利用该滤光片,优化使用VIPA板的波长色散补偿器的透明度特性。
    • 47. 发明授权
    • Process for producing thin film, thin film and optical instrument including the same
    • 用于制造薄膜,薄膜和包括其的光学仪器的方法
    • US06210542B1
    • 2001-04-03
    • US09272731
    • 1998-11-04
    • Ken KawamataNobuaki Mitamura
    • Ken KawamataNobuaki Mitamura
    • C23C1434
    • C23C14/3421C23C14/06C23C14/35C23C14/352
    • A substrate 2 is autorotatably installed in a vacuum chamber 1 at an upper part thereof. MgF2 granules 3 as a film source material are put in a quartz boat 4 and mounted on a magnetron cathode 5. The magnetron cathode 5 is connected through a matching box 6 to a 13.56 MHz radio frequency power source 7. Cooling water 8 for holding the temperature of the magnetron cathode 5 constant flows on a lower face of the magnetron cathode 5. A side face of the vacuum chamber 1 is provided with gas introduction ports 9, 10 for introducing gas in the vacuum chamber 1. A shutter 11 is placed between the magnetron cathode 5 and the substrate 2. This structure provides a process enabling forming a thin film at a high speed by sputtering, especially, a high speed sputtering process enabling forming a thin fluoride film free of light absorption in a high speed by sputtering.
    • 衬底2可自动地安装在真空室1的上部。 将作为膜源材料的MgF 2颗粒3放入石英舟4中并安装在磁控管阴极5上。磁控阴极5通过匹配箱6连接到13.56MHz射频电源7.用于保持 磁控管阴极5的温度恒定地流过磁控管阴极5的下表面。真空室1的侧面设置有气体导入口9,10,用于在真空室1内引入气体。闸板11位于 磁控管阴极5和基板2.这种结构提供能够通过溅射高速形成薄膜的工艺,特别是能够通过溅射高速形成不含光吸收的氟化物薄膜的高速溅射工艺。
    • 49. 发明授权
    • Rolling bearing with improved wear resistance
    • 滚动轴承具有改善的耐磨性
    • US5660647A
    • 1997-08-26
    • US512419
    • 1995-08-08
    • Nobuaki MitamuraKenji Yamamura
    • Nobuaki MitamuraKenji Yamamura
    • C21D1/06C21D9/40C22C38/00C22C38/24C23C8/22C23C8/32F16C33/30F16C33/62
    • C22C38/24F16C33/30F16C33/62Y10S148/906
    • In a rolling bearing including an inner race, an outer race and a plurality of rolling elements in which at least one member of the inner race, the outer race and the rolling elements is made of an alloy steel containing: 0.1 to 0.7 wt % of C; 0.8 to 2.0 wt % of V; 0.5 to 3.0 wt % of Cr; 0.3 to 1.2 wt % of Mn; 0.3 to 1.5 wt % of Si; at most 3.0 wt % of Mo; and the balance being Fe, the member being carburized or carbonitrided so that the member has a surface carbon concentration of 0.8 to 1.5 wt % and a surface concentration ratio V/C of 1 to 2.5 in order to cause VC-type carbides to be precipitated on a surface of the member, the rolling bearing exhibits improved wear resistance under a severe condition such as a high-temperature environment and simultaneously the rolling bearing has superior productivity.
    • 在包括内圈,外圈和多个滚动元件的滚动轴承中,内圈,外圈和滚动元件的至少一个构件由合金钢制成,所述合金钢含有:0.1〜0.7重量% C; 0.8〜2.0重量%的V; 0.5〜3.0重量%的Cr; 0.3〜1.2重量%的Mn; 0.3〜1.5重量%的Si; 至多3.0重量%的Mo; 余量为Fe,该构件被渗碳或碳氮共混,使得该构件的表面碳浓度为0.8〜1.5重量%,表面浓度比V / C为1〜2.5,以使VC型碳化物析出 在构件的表面上,滚动轴承在诸如高温环境的严酷条件下表现出改进的耐磨性,同时滚动轴承具有优异的生产率。