OPTICAL UNIT COMPRISING A RADIATION SOURCE, A DETECTOR AND A GRATING, AND SCANNING DEVICE INCLUDING THE OPTICAL UNIT

摘要

An optical unit comprises a first holder(11) with a radiation source (7), a second h(17) with a radiation-sensitive detector (21),a grating (25, 29), and a minor (27). Theunit further comprises a cylindrical mounting(3) having a cylinder axis (5) and a wall(3a) oriented transversely of the cylinder axis,the grating and the mirror being formed byoptically transparent wall portions of said wall.The mounting has a first positioning surface(13) to which the first holder with the radiationsource Is secured and a second positioningsurface (23) to which the second holder withthe radiation-sensitive detector is secured