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    • 10. 发明授权
    • Bubble domain transfer switches
    • 泡泡域转移开关
    • US4174540A
    • 1979-11-13
    • US811734
    • 1977-06-30
    • Mitchell S. CohenEmerson W. Pugh
    • Mitchell S. CohenEmerson W. Pugh
    • G11C11/14G11C19/08
    • G11C19/0883G11C19/085
    • These improved current controlled transfer switches are particularly useful for changing the propagation path of very small bubble domains without requiring large amounts of transfer current. The underlying principle is that the transfer operation occurs when the magnitude of the magnetic drive field used to move bubble domains has diminished to a small value, or is zero. This means that the magnetic field due to current in the switch does not have to overcome the effect of the drive field and therefore can be very small while still being effective. This is termed a "start/stop" operation and in one embodiment, current-assisted transfer is achieved by utilizing a change in the sequence of the magnetic drive field (generally an in-plane rotating field) at the time of transfer. In another embodiment, a continuous "three-quadrant" magnetic drive field is used instead of the customary 360.degree. rotating drive field. This three-quadrant field cycle is also the normal cycle for bubble storage operations and bubble motion elsewhere in the magnetic circuit is not disturbed by the switching operation because all devices are designed to operate with only one type of drive field cycle, which is the three-quadrant cycle. Switches operating in accordance with these principles do not have to have a particular design; in fact, several different designs are illustrated.
    • 这些改进的电流控制转移开关特别适用于改变非常小的气泡域的传播路径,而不需要大量的转移电流。 基本原理是当用于移动气泡畴的磁驱动场的幅度已经减小到一个较小的值或者为零时,发生转移操作。 这意味着由开关中的电流引起的磁场不必克服驱动场的影响,因此在仍然有效的情况下可以非常小。 这被称为“启动/停止”操作,并且在一个实施例中,通过利用在传送时的磁驱动场(通常为平面内旋转场)的顺序的改变来实现电流辅助传送。 在另一个实施例中,使用连续的“三象限”磁驱动场代替常规的360度旋转驱动场。 这种三象限场周期也是气泡存储操作的正常循环,并且磁路中的其他地方的气泡运动不受开关操作的干扰,因为所有器件被设计为仅使用一种类型的驱动场周期来操作,这是三个 适应周期。 根据这些原则操作的开关不必具有特定的设计; 实际上,示出了几种不同的设计。