Two-dimensional light deflector apparatus
Process and apparatus for the automatic examination of eggs for cracks or places of fracture in their shell
Optical system for determining the position of a cursor
Optical scanning system for laser treatment of electrical steel and the like Patent #: 4662708
ApplicationNo. 113668 filed on 10/28/1987
US Classes:359/220, Having planar rotating reflector with transverse rotation axis359/212Including reflective type moving element
ExaminersPrimary: Arnold, Bruce Y.
Assistant: Kachmarik, Ronald M.
Attorney, Agent or Firm
Foreign Patent References
International ClassG02B 026/10
Foreign Application Priority Data1986-10-28 JP
AbstractA mirror surface for deflecting an incident light beam is inclined to the axis of rotation and rotated for scanning the light beam. The incident light beam is applied to the mirror surface along the axis of rotation, and a reflected light beam is continuously deflected by the rotating mirror surface to scan a surface. When the incident light beam has an elliptical cross section in a direction normal to its optical axis, the cross-sectional shape of the reflected light beam varies due to the inclination of the mirror surface in response to rotation of the mirror surface. The varying shape of the reflected light beam obstructs proper reading and writing of an image with a light scanning device employing the above mirror surface. To avoid this problem, light beam shapers are provided in positions before and after the light beam is reflected by the mirror surface.