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    • 82. 发明授权
    • Composite carbide powder used for cemented carbide and method of
producing the same
    • 用于硬质合金的复合碳化物粉末及其制造方法
    • US5928976A
    • 1999-07-27
    • US859228
    • 1997-05-19
    • Yoshiharu YamamotoNobuaki AsadaYoshihiko Doi
    • Yoshiharu YamamotoNobuaki AsadaYoshihiko Doi
    • B23B27/14B22F1/00C01B32/949C01B31/34
    • C01B31/34C01P2004/61C01P2004/80C01P2006/80
    • In order to provide cemented carbide, provision is made about tungsten carbide powder which has a grain size not smaller than 1 .mu.m and which is mixed with carbon powder and chromium powder to form raw powder. The tungsten carbide powder is formed by fine primary crystal particles of tungsten carbide and satisfies an inequality given by:Y>0.61-0.33 log (X),where Y denotes a half-value width of (211) crystal planes in tungsten carbide (JCPDS-card 25-1047, d=0.9020) measured by a X-ray diffraction method and where X denotes a grain size measured by the FSSS method. There is also provided a method of producing the composite carbide powder having tungsten carbide powder as a main element, the method comprising the steps of preparing tungsten powder which has a mean grain size not smaller than 1 .mu.m, mixing the tungsten powder with carbon powder and chromium powder into a mixture, and processing the mixture in a predetermined atmosphere into fine primary crystal particles of tungsten carbide. One or more of the following additional components may be added to the mixture: Ta, Mo, Nb and Zr.
    • 为了提供硬质合金,对碳化钨粉末进行了规定,该碳化钨粉末的粒径不小于1μm,与碳粉和铬粉混合形成原料粉末。 碳化钨粉末由碳化钨的微细的一次结晶粒子形成,满足由下式给出的不等式:Y> 0.61-0.33log(X),其中Y表示碳化钨中(211)晶面的半值宽度(JCPDS 卡25-1047,d = 0.9020),X表示通过FSSS法测定的晶粒尺寸。 还提供了以碳化钨粉末为主要成分的复合碳化物粉末的制造方法,其特征在于,具有平均粒径为1μm以上的钨粉末,碳粉末 和铬粉末混合成混合物,并将预定气氛中的混合物加工成碳化钨的细晶粒。 可以向混合物中加入一种或多种以下附加组分:Ta,Mo,Nb和Zr。
    • 85. 发明授权
    • Anamorphic single lens
    • 变形单镜头
    • US4915484A
    • 1990-04-10
    • US178343
    • 1988-04-06
    • Yoshiharu Yamamoto
    • Yoshiharu Yamamoto
    • G02B3/06G11B7/135
    • G11B7/1378G02B3/06G11B7/1398G11B2007/13727G11B7/08564
    • An optical system for a laser beam printer uses, as a first image forming system, an anamorphic lens whose first surface facing a light source has a refraction power rotation-symmetrical with respect to the optical axis, and whose second surface is a toric surface having refraction powers different in horizontal and vertical directions. A coupling optical system for an optical disk information recording apparatus comprises an anamorphic single lens whose first surface is a toric surface correcting aberration only in a first direction in which radiation angle of a light beam emitted from a light source is larger than that in a second direction perpendicular to the first direction, and whose second surface is a toric surface correctly aberration only in the second direction.
    • 用于激光束打印机的光学系统使用作为第一成像系统的变形透镜,其变形透镜的第一表面面向光源具有相对于光轴旋转对称的折射光焦度,并且其第二表面是具有 折射能力在水平和垂直方向不同。 一种用于光盘信息记录装置的耦合光学系统包括:变形单透镜,其第一表面是仅在从光源发射的光束的辐射角大于第二方向的第一方向上的复曲面校正像差 垂直于第一方向的方向,并且其第二表面仅在第二方向上是复曲面正确的像差。