| 摘要 |
The instrument comprises a case (9) and a card (11) which rotated around the case about a first pivot axis (12). An objective lens system (1, 2) and two mirrors (3,4) lie in the path of the image beam. At least part of the lens system is secured to the first mirror (3) around a unit (22) which can rotate about a second pivot axis (25) relative to the card. The second mirror (4) is secured to the card. |
