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    • 51. 发明授权
    • Optical change-over switch utilizing ferroelectric liquid crystal
material
    • 利用铁电液晶材料的光转换开关
    • US4836657A
    • 1989-06-06
    • US940491
    • 1986-12-10
    • Yasuhiro GunjiSadayuki OkadaMasato IsogaiKatsumi KondoMasahiko IbamotoKazuhiro KuwabaraAtsushi Kanke
    • Yasuhiro GunjiSadayuki OkadaMasato IsogaiKatsumi KondoMasahiko IbamotoKazuhiro KuwabaraAtsushi Kanke
    • G02F1/1333G02F1/141
    • G02F1/1326G02F1/141
    • The liquid crystal cell (30) for the optical change-over switch comprises a pair of transparent substrates (1), a pair of transparent flat electrodes (2) provided on the respective opposing surfaces of the substrates, orientation control films (3) provided on the flat electrodes (2), two pair of comb shaped electrodes (33) respectively provided on the orientation control films (3), and a ferroelectric liquid crystal layer (4) confined between the substrates (1). The optical incidence plane (31) to the cell (30) is so selected that the plane (31) is away from the helical axes (9) of the ferroelectric liquid crystal in the cell (30) in the order of somewhat greater than the tilt angle (.theta..sub.t) of the ferroelectric liquid crystal. The pair of flat electrodes (2) generate a first electric field (37a) perpendicular to the layer (32) and orient the long axes of the ferroelectric liquid crystal molecules into a first orientation (35a') parallel to the layer (32 ) to induce a first refractive index which causes simultaneous reflection of unpolarized light beam (7+8) with a predetermined incidence angle (.theta.). The two pair of comb shaped electrodes (33) generate a second electric field (37b') parallel to the layer and perpendicular to the helical axes (9) and orient the long axes of the molecules into a second orientation (35b') not in parallel to the layer (32) to induce a second refractive index which causes simultaneous transmission of the unpolarized light beam (7+8) with the predetermined incidence angle (.theta.).
    • 用于光转换开关的液晶单元(30)包括一对透明基板(1),设置在基板的相应相对表面上的一对透明平板电极(2),提供定向控制膜 在平面电极(2)上,分别设置在取向控制膜(3)上的两对梳状电极(33)和限制在基板(1)之间的铁电液晶层(4)。 选择细胞(30)的光入射平面(31),以使得平面(31)以略大于细胞(30)的大小的顺序远离细胞(30)中的铁电液晶的螺旋轴(9) 铁电液晶的倾斜角(θt)。 一对扁平电极(2)产生垂直于层(32)的第一电场(37a),并将铁电液晶分子的长轴定向成与层(32)平行的第一取向(35a')至 诱导第一折射率,其引起非偏振光束(7 + 8)以预定入射角(θ)的同时反射。 两对梳状电极(33)产生平行于该层并垂直于螺旋轴(9)的第二电场(37b'),并使分子的长轴定向成不在第二取向(35b') 平行于层(32)以诱导第二折射率,其引起非偏振光束(7 + 8)以预定入射角(θ)的同时透射。
    • 54. 发明授权
    • Motor control apparatus with an improved thyristor chopper circuit
    • 电机控制装置,具有改进的晶闸管斩波电路
    • US4209733A
    • 1980-06-24
    • US936927
    • 1978-08-25
    • Hiroshi NaritaMasahiko IbamotoJinichi Toyama
    • Hiroshi NaritaMasahiko IbamotoJinichi Toyama
    • H02M1/06H02P7/29
    • H02P7/29Y10S388/915Y10S388/92
    • A motor control apparatus to supply current from a D-C source to an electric motor has a thyristor chopper circuit, the duty factor of which is controlled depending on a current instruction signal. The thyristor chopper circuit is provided between the terminals of the D-C source in series with an electric motor, and has main and auxiliary thyristors. A series connection of a capacitor and a reactor, forming commutating elements, is connected across the auxiliary thyristor and oscillates to generate a pulse of current through a forward diode in order to turn off the main thyristor when the auxiliary thyristor is turned on. In addition, a saturable current transformer is so provided that through a primary winding thereof chopper current flows, and the secondary winding operates as the reactance of the commutating elements. Current flowing through the secondary winding therefore depends on the chopper current flowing through the primary winding.
    • 从D-C源向电动机供给电流的电动机控制装置具有晶闸管斩波电路,其占空因数根据电流指令信号而被控制。 晶闸管斩波电路设置在与电动机串联的D-C源的端子之间,并具有主晶闸管和辅助晶闸管。 电容器和电抗器的串联连接,形成换向元件,跨过辅助晶闸管连接并振荡,以产生通过正向二极管的电流脉冲,以便在辅助晶闸管导通时关断主晶闸管。 此外,可饱和电流互感器被设置为通过其初级绕组斩波电流流动,次级绕组作为换向元件的电抗工作。 因此,流过次级绕组的电流取决于流过初级绕组的斩波电流。
    • 59. 发明授权
    • Electric vehicle control device
    • 电动车控制装置
    • US4388573A
    • 1983-06-14
    • US254295
    • 1981-04-15
    • Michimasa HoriuchiMasahiko IbamotoKiyoshi Nemoto
    • Michimasa HoriuchiMasahiko IbamotoKiyoshi Nemoto
    • H02P3/14B60L7/00B60L7/12H02P7/28
    • H02P7/281
    • An electric vehicle control device is disclosed which includes a main circuit for supplying power from a d.c. power supply to a driving motor through a chopper, a phase shifter for controlling the conduction ratio of the chopper in such a manner that a current flowing through the driving motor is proportional to an instruction value determined by how much an accelerator pedal is trodden, a circuit for instructing a regenerative braking operation, and a changeover switch for changing over the main circuit between a power running state and a regenerative braking state. The changeover switch is changed over in the regenerative braking state when another power running state in the direction opposite to the current running direction is instructed in a predetermined time after the stop of a power running state where the chopper had a conduction ratio greater than a preset value.
    • 公开了一种电动车辆控制装置,其包括用于从直流电源供电的主电路。 通过斩波器向驱动电动机供电;移相器,用于以使得流过驱动电动机的电流与由加速踏板踩踏多少确定的指令值成比例地控制斩波器的导通比; 用于指示再生制动操作的电路,以及用于在电力运行状态和再生制动状态之间切换主电路的转换开关。 当切断器的导通率大于预设值的电力运行状态停止之后的预定时间内,指示在与当前运行方向相反的方向上的另一个动力运行状态时,再生制动状态切换开关。 值。