| 摘要 |
<p>In a microscopic spectrometer using a Cassegrain objective (1) as an objective, an inverse placed telescope (20, 30, 40) as a relay optics is placed behind an image plane (12) of said Cassegrain objective (1) and a paraboloid mirror (24) for collecting a beam from said inverse placed telescope (20, 30, 40) to focus into an image on a detecting element (8) is provided so that such relations that a central obstruction ratio in said Cassegrain objective (1) is larger than that in the inverse placed telescope (20, 30, 40), that a diameter of an image of a pupil of the Cassegrain objective (1) projected on a secondary mirror as a pupil of the inverse placed telescope (20, 30, 40) being same as a diameter of said secondary mirror of the inverse placed telescope (20, 30, 40) or smaller, and that an image of a beam-masking diameter of the Cassegrain objective (1) projected on the secondary mirror as said pupil of the inverse placed telescope (20, 30, 40) being same as a beam-masking diameter of the inverse placed telescope (20, 30, 40) or larger, may hold good between the Cassegrain objective (1) and the inverse placed telescope (20, 30, 40).</p> |
