| 摘要 |
PURPOSE:To obtain a photograph image of the least distortion when the photographing camera is set at the desired position near the cathode-ray tube, by giving previously the pincusion distortion to the picture which is displayed on the cathode- ray tube screen. CONSTITUTION:Compensating coils 13a-13d are provided in addition to horizontal and vertical deflecting yokes 11 and 12 which are distributed at the deflecting part of cathode-ray tube 10. These coils are distributed at the positions corresponding to the four corners of tube 10 respectively, and the current is supplied to these coils independently. Multi-format camera 19 consisting of four cameras distributed into nearly a rectangular form and in correspondence to the cathode- ray tube screen is provided in the front of tube 10. Then selection signal 15 is delivered in synchronization with the working start of the camera, and the maximum current is secured for the compensating coil which is set at the furthest position. Thus the pincushion distortion is formed so that the picture image viewed through the selected camera may have the least distortion. |
