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    • 3. 发明申请
    • STEPPING MOTOR DRIVING APPARATUS AND STEPPING MOTOR DRIVING METHOD
    • 步进电机驱动装置和步进电机驱动方法
    • US20080067969A1
    • 2008-03-20
    • US11933677
    • 2007-11-01
    • Hiroshi FujinakaNaoki Kawamoto
    • Hiroshi FujinakaNaoki Kawamoto
    • H02P8/12
    • G05B19/40G05B2219/41326G05B2219/42198
    • A stepping motor driving apparatus includes a detector that detects a current supplied to a winding included in the stepping motor, a first offset adding section that adds an offset to the output of the detector, an amplifier that amplifies the output of the first offset adding section, a reference signal generator that generates a reference signal indicating a current limit, a second offset adding section that adds an offset to the output of the reference signal generator, a switching section that supplies a power to the winding when the switching section is turned on and cuts off a power to the winding when the switching section is turned off, and a PWM controller that turns on the switching section every predetermined period, and turns off the switching section when the output of the amplifier exceeds the output of the second offset adding section.
    • 步进电动机驱动装置包括:检测器,其检测提供给步进电动机中所包括的绕组的电流,对检测器的输出添加偏移量的第一偏移相加部分;放大器,用于放大第一偏移加法部分的输出; 产生表示电流限制的参考信号的参考信号发生器,将偏移量加到参考信号发生器的输出端的第二偏移量相加部分,当切换部分接通时向切断部分供电的切换部分 并且在切换部分断开时切断绕组的电源;以及PWM控制器,其每隔预定周期导通开关部分,并且当放大器的输出超过第二偏移量相加的输出时关断开关部分 部分。
    • 4. 发明授权
    • Projection lens system
    • 投影镜头系统
    • US5404246A
    • 1995-04-04
    • US80702
    • 1993-06-24
    • Toshihide KanekoEiichi ToideNaoki Kawamoto
    • Toshihide KanekoEiichi ToideNaoki Kawamoto
    • G02B9/62G02B13/18
    • G02B13/18G02B9/62
    • A projection lens system has a first lens to a sixth lens which are serially arranged in this order from a screen side. The first lens has a meniscus configuration in which a convex surface is directed toward the screen side and the power of the lens changes from positive to negative from the optical axis toward a peripheral portion of the lens. The first lens has two aspherical surfaces. The second lens has a positive power meniscus configuration in which a convex surface is directed toward the screen side. Both surfaces of the second lens are aspherical. The third lens has a positive power meniscus configuration in which a convex surface is directed toward the screen side. The fourth lens is disposed close to the third lens and has two convex surfaces. The fifth lens has a positive power meniscus configuration in which a concave surface is directed toward the screen side. Both surfaces of the fifth lens are aspherical. The sixth lens has a concave surface which has a large curvature directed toward the screen side. The surface of the sixth lens on the screen side is aspherical.
    • 投影透镜系统具有从屏幕侧按顺序排列的第一透镜至第六透镜。 第一透镜具有弯月面构造,其中凸表面指向屏幕侧,并且透镜的光焦度从光轴朝向透镜的周边部分从正向变为负。 第一透镜具有两个非球面。 第二透镜具有正的功率弯月形结构,其中凸面指向屏幕侧。 第二透镜的两个表面是非球面的。 第三透镜具有正的功率弯月形结构,其中凸面指向屏幕侧。 第四透镜靠近第三透镜设置并具有两个凸面。 第五透镜具有正的功率弯月形结构,其中凹面指向屏幕侧。 第五透镜的两个表面都是非球面的。 第六透镜具有朝向屏幕侧的大曲率的凹面。 屏幕侧的第六个透镜的表面是非球面的。
    • 6. 发明授权
    • Stepping motor driving apparatus and stepping motor driving method
    • 步进电机驱动装置和步进电机驱动方法
    • US07352150B2
    • 2008-04-01
    • US11484921
    • 2006-07-10
    • Hiroshi FujinakaNaoki Kawamoto
    • Hiroshi FujinakaNaoki Kawamoto
    • G05B19/40
    • G05B19/40G05B2219/41326G05B2219/42198
    • A stepping motor driving apparatus includes a detector that detects a current supplied to a winding included in the stepping motor, a first offset adding section that adds an offset to the output of the detector, an amplifier that amplifies the output of the first offset adding section, a reference signal generator that generates a reference signal indicating a current limit, a second offset adding section that adds an offset to the output of the reference signal generator, a switching section that supplies a power to the winding when the switching section is turned on and cuts off a power to the winding when the switching section is turned off, and a PWM controller that turns on the switching section every predetermined period, and turns off the switching section when the output of the amplifier exceeds the output of the second offset adding section.
    • 步进电动机驱动装置包括:检测器,其检测提供给步进电动机中所包括的绕组的电流,对检测器的输出添加偏移量的第一偏移相加部分;放大器,用于放大第一偏移加法部分的输出; 产生表示电流限制的参考信号的参考信号发生器,将偏移量加到参考信号发生器的输出端的第二偏移量相加部分,当切换部分接通时向切断部分供电的切换部分 并且在切换部分断开时切断绕组的电源;以及PWM控制器,其每隔预定周期导通开关部分,并且当放大器的输出超过第二偏移量相加的输出时关断开关部分 部分。
    • 8. 发明申请
    • Stepping motor driving apparatus and stepping motor driving method
    • 步进电机驱动装置和步进电机驱动方法
    • US20070046245A1
    • 2007-03-01
    • US11484921
    • 2006-07-10
    • Hiroshi FujinakaNaoki Kawamoto
    • Hiroshi FujinakaNaoki Kawamoto
    • G05B19/40
    • G05B19/40G05B2219/41326G05B2219/42198
    • A stepping motor driving apparatus includes a detector that detects a current supplied to a winding included in the stepping motor, a first offset adding section that adds an offset to the output of the detector, an amplifier that amplifies the output of the first offset adding section, a reference signal generator that generates a reference signal indicating a current limit, a second offset adding section that adds an offset to the output of the reference signal generator, a switching section that supplies a power to the winding when the switching section is turned on and cuts off a power to the winding when the switching section is turned off, and a PWM controller that turns on the switching section every predetermined period, and turns off the switching section when the output of the amplifier exceeds the output of the second offset adding section.
    • 步进电动机驱动装置包括:检测器,其检测提供给步进电动机中所包括的绕组的电流,对检测器的输出添加偏移量的第一偏移相加部分;放大器,用于放大第一偏移加法部分的输出; 产生表示电流限制的参考信号的参考信号发生器,将偏移量加到参考信号发生器的输出端的第二偏移量相加部分,当切换部分接通时向切断部分供电的切换部分 并且在切换部分断开时切断绕组的电源;以及PWM控制器,其每隔预定周期导通开关部分,并且当放大器的输出超过第二偏移量相加的输出时关断开关部分 部分。
    • 10. 发明授权
    • Liquid crystal projector with condenser lenses for blue and green panels
only or the red panel condenser lens focal length being largest
    • 液晶投影机,仅适用于蓝色和绿色面板的聚光透镜或红色面板聚焦镜头焦距最大
    • US5786874A
    • 1998-07-28
    • US675291
    • 1996-07-01
    • Naoki KawamotoMasanori Kojima
    • Naoki KawamotoMasanori Kojima
    • G03B27/18G02F1/13G02F1/1347G03B21/00G03B33/12H04N5/74H04N9/31G02F1/1335
    • H04N9/3105
    • On the incident sides of the blue light modulating liquid crystal panel and the green light modulating liquid crystal panel, condenser lenses whose outer diameter is equal to or more than that of the two liquid crystal panels are disposed respectively. No condenser lens is disposed on the incident side of the red light modulating liquid crystal panel. The focal length f of the two condenser lenses is preferably set to be a value of (L.sub.1 .multidot.L.sub.2)/(L.sub.1 +L.sub.2), where L.sub.1 is the distance between each condenser lens and the light source, and L.sub.2 is the distance between each condenser lens and the projection lens. The direct light from the discharge lamp and incident upon the condenser lenses is all incident upon the projection lens. Alternatively, a condenser lens may be disposed on the incident side of the red light modulating liquid crystal, but having a focal length which is longer than the other condenser lenses, preferably equal to L.sub.1. Therefore, an image on a screen is improved in illuminance difference between the central portion and the peripheral portion and at the same time, luminance balance of the three single color lights is improved and color shade is reduced.
    • 在蓝色调制液晶面板和绿色调制型液晶面板的入射侧,分别配置外径等于或大于两个液晶面板的聚光透镜。 没有聚光透镜设置在红光调制液晶面板的入射侧。 两个聚光透镜的焦距f优选设定为(L1xL2)/(L1 + L2)的值,其中L1是每个聚光透镜和光源之间的距离,L2是每个聚光透镜之间的距离 和投影透镜。 来自放电灯的入射到聚光透镜的直射光全部入射到投影透镜上。 或者,聚光透镜可以设置在红色光调制液晶的入射侧,但是具有比其他聚光透镜更长的焦距,优选地等于L1。 因此,屏幕上的图像在中心部分和周边部分之间的照度差异得到改善,同时改善了三种单色光的亮度平衡,降低了色调。