| 摘要 |
The reflector (1) has two focal points one being occupied by the light source (3). A collimating lens (4) is arranged in front of the second focal point. A dimmer screen (E) is located near the focal point of the lens (4). The reflector (1), the lens (4), and the dimmer screen (E) are mounted in the same frame (5), with the screen (E) held in a carrier which is an integral part of this frame by means of the additional part. The carrier, the screen (E) and the additional part have temp. coeffts. of expansion and relative dimensions chosen so that, regardless of working conditions and temp. changes in the limiter of the screen, they retain their relative positions along the optical axis (2). Both the carrier and the additional part are basically U-shaped, the screen (E) resting on the latter.
|
