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    • 73. 发明授权
    • Ferroelectric liquid crystal composition
    • 铁电液晶组成
    • US5478495A
    • 1995-12-26
    • US213816
    • 1994-03-17
    • Masahiro TeradaAkio YoshidaKenji ShinjoToshiharu UchimiTakeshi Togano
    • Masahiro TeradaAkio YoshidaKenji ShinjoToshiharu UchimiTakeshi Togano
    • C09K19/04C09K19/42C09K19/46C09K19/48G02F1/137C09K19/52G02F1/13
    • C09K19/46C09K19/04C09K19/42
    • A ferroelectric liquid crystal composition, comprising at least three mesomorphic compounds represented by the following formula (I): ##STR1## wherein C* denotes an asymmetric carbon atom; E denotes a mesomorphic compound residue including a divalent 6-membered ring-containing group capable of having a substituent; and A and B are mutually different groups respectively selected from the class of (a) methyl group, (b) linear or branched alkyl groups having 2-18 carbon atoms capable of having a substituent, (c) linear or branched alkyloxy groups having 1-18 carbon atoms, (d) linear or branched alkyloxyalkyl groups having 2-18 carbon atoms, (e) linear or branched alkyloxycarbonyl groups having 2-18 carbon atoms, (f) linear or branched alkyloxycarbonylmethyl groups having 3-18 carbon atoms; (g) chlorine or bromine, (h) fluorine, (i) trifluoromethyl group, and (j) cyano group; the above-mentioned at least three mesomorphic compounds belonging to at least three mutually different series of compounds which are different from each other in the combination of the groups A and B attached to the asymmetric carbon atom respectively selected from any one of the sub-classes (a)-(j).
    • 一种铁电液晶组合物,其包含由下式(I)表示的至少三种介晶化合物:其中C *表示不对称碳原子; E表示包含能够具有取代基的二价含6元环的基团的介晶化合物残基; A和B是分别选自(a)甲基,(b)具有2-18个碳原子的具有取代基的直链或支链烷基,(c)具有1个碳原子的直链或支链烷氧基的相互不同的基团 -18个碳原子,(d)具有2-18个碳原子的直链或支链烷氧基烷基,(e)具有2-18个碳原子的直链或支链烷氧基羰基,(f)具有3-18个碳原子的直链或支链烷氧基羰基甲基; (g)氯或溴,(h)氟,(i)三氟甲基和(j)氰基; 属于至少三种相互不同的一系列化合物的上述至少三种介晶化合物,它们分别与分别选自任何一个亚类的不对称碳原子相连的基团A和B的组合彼此不同 (a) - (j)。
    • 77. 发明授权
    • Method of exposing printed wiring boards having through holes
    • 曝光具有通孔的印刷电路板的方法
    • US5246813A
    • 1993-09-21
    • US881489
    • 1992-05-11
    • Susumu HoshinouchiAkio YoshidaAkinobu Kawazu
    • Susumu HoshinouchiAkio YoshidaAkinobu Kawazu
    • G03F7/20H05K3/00H05K3/06
    • H05K3/0082G03F7/2059H05K3/0094H05K2201/09581H05K2203/0759H05K2203/092H05K2203/135H05K3/064Y10S430/143Y10S430/146
    • A method of exposing the resist on a printed wiring board having through holes for connecting planar circuit patterns on the plane surfaces of the substrate is disclosed, wherein an electron beam direct writing system is utilized for scanning a converging electron beam as the exposure energy. The electron beam produced by the system enters the opening of the through hole, forming an inclination angle different from 0 degrees and up to 7 degrees with respect to the normal to the opening area of the through hole, such that the resist on the wall surface of the through hole is exposed simultaneously both by the direct and the reflected electron beam. The amount of exposure per unit area of the opening of the through hole may be controlled to 2 h/r times the amount of exposure per unit area over the planar surface of the substrate, wherein h and r are the depth and the radius of the through holes, respectively. A reflector plate may be disposed at the bottom opening of the through holes to further enhance the utilization efficiency of the electron beam during through-hole wall surface exposure.
    • 公开了一种将抗蚀剂曝光在具有用于连接平面电路图形的通孔的印刷线路板上的方法,该平面电路图案用于在基板的平面上连接平面电路图案,其中使用电子束直接写入系统来扫描会聚电子束作为曝光能量。 由系统产生的电子束进入通孔的开口,形成相对于通孔的开口面积的法线0度和至多7度的倾斜角度,使得壁表面上的抗蚀剂 通过直接和反射的电子束同时暴露通孔。 可以将通孔开口单位面积的曝光量控制在基板的平面表面上每单位面积曝光量的2h / r倍,其中h和r是深度和半径 通孔。 反射板可以设置在通孔的底部开口处,以进一步提高通孔壁表面暴露期间电子束的利用效率。