| 摘要 |
In the particular embodiments of the invention described herein, a frequency selective photo-electronic image transducer includes an insulating plate having minute closely spaced prismatic ridges, the surfaces of which are covered with a capacitive sandwich structure comprising an electrode coated on the plate, an insulating layer and a photo-emissive material at the outer surface, the latter being in the form of a mosaic of isolated elements. The electrodes on alternate ridges, or in another form on corresponding sides of every ridge, are connected together and to an alternating potential source operating at the desired frequency of selection, the other electrodes being grounded. An illuminated object containing light modulated with information at the selected frequency is imaged onto the surface of the plate intermittently and, between exposures, a line scan tube image onto the surface reads out the charge accumulated at the various elemental areas in succession. The frequency-selected image is then reproduced on a display tube. In an alternative embodiment, light from an image of the object is conveyed to the photo-sensitive plate by a fiber-optics array and a mask is provided to compensate for inequalities in the sensitivities of the photo-emissive elements.
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