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"The Return Beam Vidicon (RBV) camera system features a recently developed sensor which is capable of producing images with a resolution of 4500 TV lines. Discussed here are the operation of RCA's 2-in RBV and how its primary assets are compatible with the system requirements of programs such as the Earth Resources Observation Satellite. The RBV combines the advantages of the conventional storage vidicon ASOS photoconductor and the orthicon electron multiplier. The sensor operates in a slow-scan mode and utilizes the modulated return beam as a signal path to decrease the signal noise. The primary assets of this device are an improved lowlight sensitivity, with higher signal-to-noise ratios than can be obtained with a conventional vidicon, coupled with extremely high resolution. The 4500-line video signal generated in the 1-in format is converted into a high-quality hard copy print by the Laser Beam Image Reproducer (LBIR). — The high image retention characteristic of the photoconductor makes possible the slow-scan readout of a high-definition (100-ft ground resolution from satellite altitudes), nonsmeared image in limited bandwidth. Thus, a three-camera electronically shuttered system can be used to simultaneously photograph a given section of the Earth's surface in three different spectral bands. Data produced by the sequential readout of the three cameras, when superimposed, can be used to generate a sharp multispectral image. The high-resolution, low image distortion (geometric integrity, shading, etc.), characteristic of the RBV, results from the integration of the vidicon with a carefully controlled electron optic and deflection system. Distributed focus coils are used to obtain minimum spot size and proper beam landing over the full format. The image quality of the RBV/LBIR's high-resolution, low-noise picture is comparable with ground reproduction of present-day film and data transfer techniques used in unmanned surveillance satellites.
Published in: Journal of the SMPTE ( Volume: 79 , Issue: 1 , Jan. 1970 )"
Система камеры с видиконом с возвращаемым лучом оснащена недавно разработанным сенсором, способным создавать изображения с разрешением 4500 ТВ-линий.
... Видеосигнал из 4500 строк, генерируемый в формате 1 дюйм, преобразуется в высококачественное изображение на плёнке с помощью лазерной системы переноса изобоажения на фото плёнку.
Published in: Journal of the SMPTE ( Volume: 79, Issue: 1, Jan. 1970)