公开(公告)号：US5589973A

公开(公告)日：1996-12-31

申请号：US243677

申请日：1994-05-16

申请人： Gregg R. King ,  John A. Morrell ,  Lawrence S. Blake ,  Philip A. Rombult ,  Thomas K. Hebert

发明人： Gregg R. King ,  John A. Morrell ,  Lawrence S. Blake ,  Philip A. Rombult ,  Thomas K. Hebert

IPC分类号： G02B26/10 ,  G02B26/08

CPC分类号： G02B26/10

摘要： A non-rotating optical shield is generally cylindrical in shape and surrounds a rotating optical deflector to reduce airflow and optical distortion, as well as acoustic noise. A beam entrance aperture is provided in an end of the shield allowing an input beam to project onto the rotating deflector along the deflector's spin axis. The entrance aperture is sealed by a window to prevent air from being drawn into the shield by the action of the rotating optical deflector. The deflected beam exits the shield through a beam exit aperture in the side of the shield which is enclosed by an optical element. Clearances between the shield and the rotating deflector are minimal. The shield reduces temperature gradients in the surrounding air thus reducing optical distortions caused by changes in refractive indices of the deflector and surrounding air. An additional feature of the shield is a fan-like portion which extends radially outward from the cylindrical body portion of the shield at the beam exit aperture, to enclose the exit beam as it scans through as range of angles. The fan-like portion extends as far along the exit beam path as desired and advantageously reduces acoustical noise generated by the rotating optical deflector.

摘要翻译： 非旋转光学屏蔽件通常为圆柱形并且围绕旋转的光学偏转器以减少气流和光学失真以及声学噪声。 光束入射孔设置在屏蔽的端部，允许输入光束沿着偏转器的旋转轴线突出到旋转偏转器上。 入口孔由窗口密封，以防止空气被旋转的光学偏转器的作用吸入屏蔽。 偏转的光束通过由光学元件包围的屏蔽侧的光束出射孔离开屏蔽。 屏蔽和旋转偏转器之间的间隙最小。 屏蔽层减少周围空气中的温度梯度，从而减少由偏转器和周围空气的折射率变化引起的光学变形。 屏蔽件的另外的特征是扇形部分，其在光束出射孔处从屏蔽体的圆柱形主体部分径向向外延伸，以在其作为角度范围扫描时封闭出射光束。 扇形部分根据需要沿着出射光束路径延伸得很远，并且有利地降低由旋转的光学偏转器产生的声音噪声。