| 摘要 |
PURPOSE:To realize a picture recording device in which a cathode ray tube to be subjected to one-dimensional scanning is used as the exposure means and which does not produce any streaks with a simple constitution, by moving the scanning position with an electronic beam on a fluorescent screen in the direction normal to the direction of the one-dimensional scanning as recording proceeds. CONSTITUTION:A cathode ray tube 1 has a fluorescent screen 1a at the center. 2 in the figure shows a deflection coil mounted on the cathode ray tube 1 and only a vertical deflection coil is shown here. A photosensitive film, etc., are held at the surface of a rotary drum 3. A control section 4 gives a video signal and deflection signal to the cathode ray tube 1 and controls the rotating speed of the rotary drum 3. The relation between a deflection step and the rotating speed of the rotary drum 3 is selected in such a way that, when the rotary drum 3 makes one turn, deflection on the full width (h) of the fluorescent screen can be completed. Moreover, the problem on the picture recording caused by the divergence of the scanning position can be avoided when the rotating speed of the rotary drum 3 is selected properly. When the above mentioned constitution is used, a scanning line (l) moves in the direction normal to the scanning line (l) as recording proceeds. Unevenness in the quantity of light at each scanning line changes every time due to its randomness and, therefore, no streaks occur. |
