| 摘要 |
<p>A camera for recording television, photographic or cinematographic images comprises an automatic focusing device. The information required for automatic focusing is obtained with the aid of a partial blocking arrangement for blocking two different portions of an optical path leading to an electronic image sensor. These two portions are located on opposite sides of an optical central axis. After signals obtained during the partial blocking periods have been compared with each other, the focusing is adjusted until signal correlation is optimized. To produce a camera having both undisturbed scene recording and automatic focusing, while using only one sensor, this camera includes a charge transfer device. The device comprises a pickup member, a storage member, and a shift register member. The charge transfer device operates during a television field period TV in the following sequence: scene pickup period TVS, pickup storage transfer period TFO, first partial blocking pickup period TAS, first blocking storage transfer period TF1, second partial blocking pickup period TBS, and second blocking storage transfer period TF2.</p> |
