| 摘要 |
<p>For wash light-type lamps for theatre and show stages there is designed an optical system having at least two optical elements with a variable mutual position, where the first optical element (4) has a central hole (5) and a translucent screen (7) moveable with respect to the central hole, the positioning of the screen with respect to the central hole (5) being coupled with a mechanism for a change of the mutual position of the optical elements.</p> |
