| 摘要 |
<p>The apparatus (1) in reference comprises an axially-centering member (9) in the tubular envelope (10) of which two portions (10a, 10b) are provided which are adapted to house a first lens-holding group in which a biconvex lens (13) is mounted and a second lens-holding group in which a biconcave lens (21) is mounted. The biconvex lens (13) can move axially inside the axially-centering member (9) while the biconcave lens (21) is provided with a floating movement for the correction of focusing errors induced in the equipment on which the axially-centering member (9) is mounted.</p> |
