发明授权
US5825555A Beam projecting apparatus 失效
光束投影仪

Beam projecting apparatus
摘要:
A beam projecting apparatus has a light source and a reflecting device for reflecting and rotating a bundle of light emitted from the light source for forming a reference plane. A shape converting optical system is provided in an optical path from the light source to the reflecting device for converting the bundle of light from an elliptical sectional shape to a circular sectional shape.
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