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1. 发明授权

US06631233B2 Graded index type optical fibers and method of making the same 有权
公开(公告)号：US06631233B2
公开(公告)日：2003-10-07
申请号：US09940480
申请日：2001-08-29
申请人： Tomoyoshi Yamashita , Yasuteru Tahara , Kazuki Nakamura
发明人： Tomoyoshi Yamashita , Yasuteru Tahara , Kazuki Nakamura
IPC分类号： G02B618
CPC分类号： G02B6/02038 , B29D11/00682 , G02B6/03633
摘要： A graded index type optical fiber having a multilayer structure comprising a plurality of concentrically arranged layers formed of (co)polymers selected from the group consisting of two or more homopolymers HP1, HP2, . . . , HPn derived from monomers M1, M2, . . . , Mn, respectively, and having refractive indices decreasing in that order, and one or more binary copolymers CP derived from these monomers, the multilayer structure being such that a mixed layer consisting of the (co)polymers constituting two adjacent layers is formed therebetween, and the refractive index is highest at the center and decreases gradually toward the outer periphery. This optical fiber can be continuously formed by feeding the (co)polymers to a multilayer concentric circular nozzle and thereby extruding them through the nozzle, and allowing the polymers to interdiffuse between adjacent layers of the fiber.

2. 发明授权

US06185353B2 Graded index type optical fibers and method of making the same 有权
公开(公告)号：US06185353B2
公开(公告)日：2001-02-06
申请号：US09142161
申请日：1998-09-28
申请人： Tomoyoshi Yamashita , Yasuteru Tahara , Kazuki Nakamura
发明人： Tomoyoshi Yamashita , Yasuteru Tahara , Kazuki Nakamura
IPC分类号： G02B618
CPC分类号： G02B6/02038 , B29D11/00682 , G02B6/03633
摘要： A graded index type optical fiber having a multilayer structure comprising a plurality of concentrically arranged layers formed of (co)polymers selected from the group consisting of two or more homopolymers HP1, HP2, . . . , HPn derived from monomers M1, M2, . . . , Mn, respectively, and having refractive indices decreasing in that order, and one or more binary copolymers CP derived from these monomers, the multilayer structure being such that a mixed layer consisting of the (co)polymers constituting two adjacent layers is formed therebetween, and the refractive index is highest at the center and decreases gradually toward the outer periphery. This optical fiber can be continuously formed by feeding the (co)polymers to a multilayer concentric circular nozzle and thereby extruding them through the nozzle, and allowing the polymers to interdiffuse between adjacent layers of the fiber.

3. 发明授权

US06307992B2 Graded index type optical fibers and method of making the same 有权
公开(公告)号：US06307992B2
公开(公告)日：2001-10-23
申请号：US09726553
申请日：2000-12-01
申请人： Tomoyoshi Yamashita , Yasuteru Tahara , Kazuki Nakamura
发明人： Tomoyoshi Yamashita , Yasuteru Tahara , Kazuki Nakamura
IPC分类号： G02B618
CPC分类号： G02B6/02038 , B29D11/00682 , G02B6/03633
摘要： A graded index type optical fiber having a multilayer structure comprising a plurality of concentrically arranged layers formed of (co)polymers selected from the group consisting of two or more homopolymers HP1, HP2, . . . , HPn derived from monomers M1, M2, . . . , Mn, respectively, and having refractive indices decreasing in that order, and one or more binary copolymers CP derived from these monomers, the multilayer structure being such that a mixed layer consisting of the (co)polymers constituting two adjacent layers is formed therebetween, and the refractive index is highest at the center and decreases gradually toward the outer periphery. This optical fiber can be continuously formed by feeding the (co)polymers to a multilayer concentric circular nozzle and thereby extruding them through the nozzle, and allowing the polymers to interdiffuse between adjacent layers of the fiber.

4. 发明授权

US5120978A Method and apparatus for scattered light measurements 失效
标题翻译：用于散射光测量的方法和装置
公开(公告)号：US5120978A
公开(公告)日：1992-06-09
申请号：US583862
申请日：1990-09-17
申请人： Tomoyoshi Yamashita , Yasuteru Tahara
发明人： Tomoyoshi Yamashita , Yasuteru Tahara
IPC分类号： G01N21/49 , G01N21/47
CPC分类号： G01N21/47 , G01N2021/4711
摘要： A method and an apparatus for high-precision scattered light measurements characterized in that:in the optical path of a laser beam from the laser light source, the cross section of the laser beam is adjusted, and the laser beam is irradiated into a specimen fixed relatively to the laser beam to cause scattered lights to be scattered from the specimen;the angular distribution of the scattered lights is measured by adjusting the cross section for observing the scattered light in the optical path of the scattered light and scanning relatively with the specimen as its center; and by obtaining rapid and minute changes in the scattering intensities against minute changes in the scattering angles caused by the minute ununiformity in the structure of the specimen, the optical characteristics of transparent materials are evaluated.

5. 发明授权

US4762392A Plastic optical fibers 失效
标题翻译：塑料光纤
公开(公告)号：US4762392A
公开(公告)日：1988-08-09
申请号：US830584
申请日：1986-01-28
申请人： Takashi Yamamoto , Ryuji Murata , Yasuteru Tahara , Hiromu Terada , Kenichi Sakunaga
发明人： Takashi Yamamoto , Ryuji Murata , Yasuteru Tahara , Hiromu Terada , Kenichi Sakunaga
IPC分类号： B29C47/00 , G02B6/44 , G02B6/10 , B05D5/06 , B32B27/00 , C08F120/18
CPC分类号： G02B6/443 , G02B6/02033 , G02B6/4436 , B29C47/00 , B29C47/0014 , Y10T428/2938 , Y10T428/2962 , Y10T428/2967
摘要： There is provided a plastic optical fiber capable of exhibiting good light transmitting characteristics even at high temperatures, which comprises a core layer, a cladding layer, and a protective layer as basic consititutional units, wherein the protective layer has a heat distortion temperature [HDT] of at least 120.degree. C., a thickness of at least 10 .mu.m, and a cross-sectional area of at least 0.07 times the sum of cross-sectional areas of the core and cladding layers. There is also provided such a plastic optical fiber good in high-temperature light transmitting characteristics, which comprises a core layer, a cladding layer, and a protective layer as basic constitutional units and has a plastic coating layer having a silane-crosslinked structure provided as an outer layer thereof, wherein the protective layer has a heat distortion temperature [HDT] of at least 120.degree. C., a thickness of at least 10 .mu.m, and a cross-sectional area of at least 0.07 times the sum of cross-sectional areas of the core and cladding layers.
摘要翻译： PCT No.PCT / JP85 / 00294 Sec。 371日期1986年1月28日 102（e）日期1986年1月28日PCT提交1985年5月29日PCT公布。第WO85 / 05699号公报日期为1985年12月19日。提供了即使在高温下也能表现出良好的透光特性的塑料光纤，其包括芯层，包覆层和作为基本单位的保护层，其中保护层具有至少120℃的热变形温度[HDT]，至少10μm的厚度，以及至少为芯和包层的横截面面积的总和的0.07倍的横截面积。还提供了这样一种具有高温透光特性的塑料光纤，其特征在于，包括芯层，包覆层和保护层作为基本结构单元，并且具有硅烷交联结构的塑料涂层，其设置为其外层，其中所述保护层的热变形温度[HDT]为至少120℃，厚度为至少10μm，横截面积为交联总和的至少0.07倍，芯层和包层的截面积。

6. 发明授权

US4711121A Method and equipment for detecting pinholes of hollow filament 失效
标题翻译：中空丝针孔检测方法及设备
公开(公告)号：US4711121A
公开(公告)日：1987-12-08
申请号：US587430
申请日：1984-03-08
申请人： Yasuteru Tahara , Kazuyoshi Koike
发明人： Yasuteru Tahara , Kazuyoshi Koike
IPC分类号： B01D65/10 , G01M3/04 , G01M3/20 , G01M3/00
CPC分类号： B01D65/102 , G01M3/04 , G01M3/20
摘要： An improved method and an equipment for detecting a pinhole in hollow filament, wherein the improvement comprises passing the hollow filament through a liquid maintained at a pressure higher than that of the gas in the interior of said hollow filament to allow the liquid to intrude through the pinhole into the interior of the hollow filament and detecting the intruded liquid.
摘要翻译：一种用于检测中空丝中的针孔的改进方法和设备，其中改进包括使中空细丝通过保持在高于中空细丝内部气体压力的液体的液体，以允许液体穿过针孔进入中空丝的内部并检测入侵液体。

7. 发明授权

US06449414B1 Low chromatic aberration rod lens array, its unit and image scanner employing them 失效
标题翻译：低色差棒透镜阵列，其单元和图像扫描仪采用它们
公开(公告)号：US06449414B1
公开(公告)日：2002-09-10
申请号：US09297061
申请日：1999-04-29
申请人： Yasuteru Tahara , Teruta Ishimaru , Yoshihiro Uozu , Toshinori Sumi
发明人： Yasuteru Tahara , Teruta Ishimaru , Yoshihiro Uozu , Toshinori Sumi
IPC分类号： G02B618
CPC分类号： G02B3/005 , G02B3/0056 , G02B3/0087 , G02B13/0095 , H04N1/031 , H04N1/0311 , H04N1/0312 , H04N1/0315 , H04N1/482
摘要： A color image scanner is constructed by a three primary color LED array (4) for illuminating an original (2) to be read out, a monochromatic image sensor array (3) and a rod lens array (1) disposed between the original (1) and the image sensor array (3). The focusing parameters of the three kinds of refractive index distribution type rod lenses (11, 12, 13) constituting the rod lens array (1) are set so that each of the operating wavelength band and the predetermined wavelength is different among the kinds, the lens length Zo is equal among the kinds, and the conjugate length TC at each predetermined wavelength is substantially equal among all the kinds. Accordingly, when a color image reading operation is carried out by using the rod lens array which is effective in compactness and brightness, the chromatic aberration of the rod lens array can be sufficiently reduced and high-resolution can be implemented at low cost.
摘要翻译：彩色图像扫描器由用于照射待读出的原稿（2）的三原色LED阵列（4）构成，单色图像传感器阵列（3）和设置在原稿（1）之间的杆状透镜阵列（1））和图像传感器阵列（3）。构成棒状透镜阵列（1）的三种折射率分布型棒状透镜（11,12,13）的聚焦参数被设定为使得各种工作波长带和预定波长各自不同，这些种类之间的透镜长度Zo相等，各预定波长的共轭长度TC在各种情况下基本相同。因此，当通过使用有效紧凑度和亮度的棒状透镜阵列执行彩色图像读取操作时，可以充分降低棒状透镜阵列的色差，并且可以以低成本实现高分辨率。

8. 发明授权

US4183666A Method of measuring light transmission losses of optical materials 失效
标题翻译：测量光学材料光透射损耗的方法
公开(公告)号：US4183666A
公开(公告)日：1980-01-15
申请号：US776171
申请日：1977-03-10
申请人： Yasuteru Tahara , Shunsuke Minami , Masaharu Oda , Mikio Sera
发明人： Yasuteru Tahara , Shunsuke Minami , Masaharu Oda , Mikio Sera
IPC分类号： G01M11/00 , G01N21/59 , H04B10/08 , G01N21/00
CPC分类号： G01N21/59 , G01M11/33 , G01M11/35
摘要： A method of measuring light transmission losses of optical materials comprising projecting light beams at two separate points alternatively or a light beam through a part of an optical material to be measured, and detecting the intensities of light radiated at two separate points lying along the direction of propagation of said light beams in said part.
摘要翻译：一种测量光学材料的光传输损耗的方法，包括将光束以两个分开的点交替地或通过待测量的光学材料的一部分光束投射，并且检测在沿着所述光束在所述部分中的传播。

9. 发明授权

US4798445A Plastic optical fiber and process for producing the same 失效
标题翻译：塑料光纤及其制造方法
公开(公告)号：US4798445A
公开(公告)日：1989-01-17
申请号：US847515
申请日：1986-04-03
申请人： Takashi Yamamoto , Katsuhiko Shimada , Ryuji Murata , Yasuteru Tahara , Hiromu Terada , Kenichi Sakunaga
发明人： Takashi Yamamoto , Katsuhiko Shimada , Ryuji Murata , Yasuteru Tahara , Hiromu Terada , Kenichi Sakunaga
IPC分类号： G02B6/00 , B29C47/00 , D01D5/34 , D01F8/16 , G02B1/04 , G02B6/02 , G02B6/16
CPC分类号： G02B6/02033 , B29C47/0014 , D01D5/34 , D01F8/16 , G02B1/046 , B29C47/00
摘要： A plastic optical fiber which is superior in the light transmission characteristics, particularly in those within a visible light region and also superior in heat resistance, and a process for producing the same are provided, which plastic optical fiber comprises a polycarbonate as its core material and a polymer as its cladding material having a refractive index lower than that of the core material, wherein the relationship between the light transmission loss L.sub.500 (dB/km) of the fiber as measured at a wavelength of 500 nm and that as measured at 660 nm being expressed by the following inequality:L.sub.500
摘要翻译：提供了一种塑料光纤，其光传输特性优异，特别是在可见光区域内，并且耐热性优异的塑料光纤及其制造方法，该塑料光纤包含聚碳酸酯作为芯材，作为其包层材料的聚合物，其折射率低于芯材料的折射率，其中在波长500nm测量的光纤的光传输损耗L500（dB / km）与在660nm测量的光传输损耗之间的关系由以下不等式表示：L500

10. 发明授权

US4732716A Process for preparation of multifilament optical fibers 失效
标题翻译：复丝光纤的制备工艺
公开(公告)号：US4732716A
公开(公告)日：1988-03-22
申请号：US879942
申请日：1986-06-30
申请人： Kenichi Sakunaga , Hiroshi Terada , Takashi Yamamoto , Yasuteru Tahara
发明人： Kenichi Sakunaga , Hiroshi Terada , Takashi Yamamoto , Yasuteru Tahara
IPC分类号： C03B37/083 , C03B37/08 , D01D5/36 , D01F8/04 , G02B6/04 , G02B6/06 , G02B6/44 , B29D11/00 , G02B6/00
CPC分类号： D01D5/36 , D01F8/04 , G02B6/06 , G02B6/448
摘要： A process for the preparation of a multifilament optical fiber having 1,000 to 10,000 islands as optical filaments, which comprises using a composite spinning spinneret for the preparation of an islands-in-a-sea type multifilament fiber, which comprises at least three piled orifice plates including an orifice plate having many island-forming nozzle holes, an orifice plate having a sea-forming nozzle hole and an orifice plate having a filament-gathering nozzle hole, the nozzle hole of the orifice plate arranged just above the lowermost orifice plate having a trumpet-shaped opening extending toward the lower end face thereof and a sea component flow passage being formed between two orifice plates arranged just above the lowermost orifice plate, and supplying a thermoplastic polymer for forming cores of optical filaments from the island-forming nozzle holes and a sea-forming thermoplastic polymer from the sea-forming nozzle hole to effect composite spinning and gathering many filaments in the gathering nozzle hole.
摘要翻译：一种制备具有1000至10,000个岛状光纤的复丝光纤的方法，其包括使用复合纺丝喷丝头制备海岛型复丝纤维，其包括至少三个堆积的孔板包括具有许多岛形喷嘴孔的孔板，具有海成形喷嘴孔的孔板和具有丝聚集喷嘴孔的孔板，所述孔板的喷嘴孔布置在最下面的孔板的正上方，喇叭形开口朝向其下端面延伸，海流部分流路形成在布置在最下面的孔板正上方的两个孔板之间，并从岛成形喷嘴孔供给用于形成光纤芯的热塑性聚合物，海成形热塑性聚合物从海成形喷嘴孔到复合纺丝和收集许多细丝聚集喷嘴孔。

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