| 摘要 |
PCT No. PCT/EP96/01751 Sec. 371 Date Feb. 19, 1997 Sec. 102(e) Date Feb. 19, 1997 PCT Filed Apr. 26, 1996 PCT Pub. No. WO97/01248 PCT Pub. Date Jan. 9, 1997In a process for imaging image points of a video picture by means of a light bundle which is controlled in intensity with respect to the brightness of the image points and which is deflected and then projected onto a screen by a lens or a lens system, a variable focal length is provided for the lens, the lens system or a partial lens system of the lens system and an object-side focal point is maintained stationary when the focal length is varied. In an apparatus for imaging image points of a video picture on a screen, with a deflecting device which deflects a light bundle onto a screen for linewise and framewise raster-scanning, this light bundle being controlled in intensity with respect to the brightness of the image points, and with a lens or a lens system between the deflecting device and the screen, the lens, the lens system or a partial lens system of the lens system can be adjusted with respect to focal length, and a device is provided which maintains stationary an object-side focal point of the lens or partial lens system during adjustment of the focal length. |
