Piezoelectric transformer inverter
    133.
    发明授权
    Piezoelectric transformer inverter 失效
    压电变压器

    公开(公告)号:US6153962A

    公开(公告)日:2000-11-28

    申请号:US399279

    申请日:1999-09-17

    摘要: A piezoelectric transformer inverter comprises: a piezoelectric transformer for performing voltage conversion of alternating voltage applied between primary electrodes to supply to a load connected to a secondary electrode; a driving-frequency control unit for controlling load current during driving of the load by changing the driving frequency of the piezoelectric transformer; a chopper unit for chopping input voltage applied into the driving-frequency control unit at a frequency of two or more times as high as the driving frequency and for controlling an average input voltage applied into the driving frequency control unit by changing a duty ratio of the chopping operation; and a dimming unit for intermittently stopping the driving frequency control unit by intermittently stopping the operation of the chopper unit at a frequency smaller than the driving frequency of the piezoelectric transformer, wherein even during a period in which the dimming unit is intermittently stopping the chopper unit, signals having a duty ratio for allowing the chopper unit to perform the chopping operation to be sustained inside the chopper unit.

    摘要翻译: 一种压电变压器逆变器包括:压电变压器,用于对施加在主电极之间的交流电压进行电压转换,以供应到连接到次级电极的负载; 驱动频率控制单元,用于通过改变压电变压器的驱动频率来控制负载驱动期间的负载电流; 斩波单元,用于以驱动频率的两倍或更多倍的频率斩波施加到驱动频率控制单元中的输入电压,并且通过改变驱动频率控制单元的占空比来控制施加到驱动频率控制单元的平均输入电压 切割操作; 以及调光单元,用于通过以比所述压电变压器的驱动频率小的频率间歇地停止所述斩波单元的操作来间歇地停止所述驱动频率控制单元,其中即使在所述调光单元间歇地停止所述斩波单元 具有允许斩波器单元进行斩波器内的斩波操作的占空比的信号。

    Electron-emitting device and electron beam-generating apparatus and
image-forming apparatus employing the device
    134.
    发明授权
    Electron-emitting device and electron beam-generating apparatus and image-forming apparatus employing the device 失效
    电子发射装置和电子束发生装置以及采用该装置的图像形成装置

    公开(公告)号:US5530314A

    公开(公告)日:1996-06-25

    申请号:US304216

    申请日:1994-09-12

    摘要: An electron-emitting device having an electron-emitting portion between electrodes on a substrate comprises a region A and a region B, the region A being electrically connected through the region B to at least one of the electrodes, electric conductivity .sigma..sub.1 of the material mainly constituting the region A and electric conductivity of the material .sigma..sub.2 mainly constituting the region B being in the relation of .sigma..sub.1 >.sigma..sub.2, and the region A being the electron-emitting portion. An electron beam-generating apparatus and image-forming apparatus comprise the electron-emitting device and a modulation means for modulating the electron beams emitted from the electron-emitting elements in accordance with information signals.

    摘要翻译: 在基板上的电极之间具有电子发射部分的电子发射器件包括区域A和区域B,区域A通过区域B电连接到至少一个电极,材料的导电率σ1 主要构成主要构成与西格玛2的关系的区域B的材料sigma 2的区域A和电导率,区域A是电子发射部分。 电子束发生装置和图像形成装置包括电子发射装置和用于根据信息信号调制从电子发射元件发射的电子束的调制装置。

    Anisotropic dopes of aromatic polyamides
    137.
    发明授权
    Anisotropic dopes of aromatic polyamides 失效
    芳香族聚酰胺的各向异性涂料

    公开(公告)号:US4018735A

    公开(公告)日:1977-04-19

    申请号:US594130

    申请日:1975-07-08

    CPC分类号: C08G69/12 C08G69/32

    摘要: An anisotropic aromatic polyamide dope comprising more than 10% by weight of an aromatic polyamide and a solvent for the polyamide, said polyamide consisting essentially of, at least 5 mole% but less than 35 moles%, based on its entire units, of an only partially p-oriented structural unit expressed by the following formula ##STR1## wherein Ar.sup.1 is a divalent aromatic ring whose chain-extending bonds are coaxial or parallel, X is a member selected from the group consisting of O, S and NH, and the NH group bonded to the benzene ring of the above benzoxazole, benzothiazole or benzimidazole ring is meta or para to the carbon atom of said benzene ring.

    摘要翻译: 包含大于10重量%的芳族聚酰胺和用于聚酰胺的溶剂的各向异性芳族聚酰胺涂料,所述聚酰胺基本上由至少5摩尔%但小于35摩尔%,基于其整个单元,仅含有 由下式(1)表示的部分p取向结构单元其中Ar1是链延伸键同轴或平行的二价芳环,X是选自O,S和NH的成员, 并且与上述苯并恶唑,苯并噻唑或苯并咪唑环的苯环键合的NH基是所述苯环的碳原子的间位或对位。