公开(公告)号：US5488240A

公开(公告)日：1996-01-30

申请号：US172899

申请日：1993-12-27

申请人： Louis Hlousek ,  K. C. Odencrantz ,  Richard K. Oswald ,  Donald W. Dahlin ,  Saied Motaei ,  Paul W. Siggins ,  Kenny Wong ,  Ronald A. Smith ,  Philip M. Scheinert

发明人： Louis Hlousek ,  K. C. Odencrantz ,  Richard K. Oswald ,  Donald W. Dahlin ,  Saied Motaei ,  Paul W. Siggins ,  Kenny Wong ,  Ronald A. Smith ,  Philip M. Scheinert

IPC分类号： G01J3/18 ,  G02B7/00 ,  G02B7/182 ,  H01J31/50

CPC分类号： G02B7/1828 ,  G01J3/18 ,  G02B7/005

摘要： An apparatus and method for rotating an optical element, such as a diffraction grating or mirror, utilizes a moving coil actuator and an optical encoder to provide precise element position control. The moving coil actuator, which is coupled to the optical element, is comprised of a coil immersed in a magnetic field created by a pair of magnets. Current flowing in the coil windings causes the coil, and ultimately the optical element, to rotate. An optical encoder monitors the rotation of the element and provides rotation signals representative of the instantaneous element position to an actuator control circuit. The actuator control circuit phase shifts the rotation signals and compares the phase shifted rotation signals to a desired reference signal to generate position and velocity error signals. In a track follow mode, the position error signal is applied to the moving coil actuator via a loop compensator. When the apparatus is operating in an optimal seek mode, a trajectory generator receives the velocity error signals and generates an optimum velocity signal based on a preprogrammed velocity curve. The optimum velocity signal is then applied to the moving coil actuator via the loop compensator.

摘要翻译： 用于旋转光学元件（例如衍射光栅或反射镜）的装置和方法利用移动线圈致动器和光学编码器来提供精确的元件位置控制。 耦合到光学元件的移动线圈致动器包括浸入由一对磁体产生的磁场中的线圈。 在线圈绕组中流动的电流使得线圈和最终的光学元件旋转。 光学编码器监测元件的旋转并且向致动器控制电路提供表示瞬时元件位置的旋转信号。 致动器控制电路使旋转信号相移，并将相移的旋转信号与期望的参考信号进行比较，以产生位置和速度误差信号。 在跟踪跟踪模式中，位置误差信号通过环路补偿器施加到动圈线圈致动器。 当装置以最佳搜索模式操作时，轨迹发生器接收速度误差信号，并且基于预编程的速度曲线产生最佳速度信号。 然后通过环路补偿器将最佳速度信号施加到运动线圈致动器。