A new type of color imaging process has been developed. In this process filter beads containing color-former and a panchromatic photoconductor are employed.
In this report, the principle of this process, the structure of the filter beads, the photoconductor and the image receiving paper are described.
The main technical feature of this novel process resides in filter beads. Beads are the mixture of three kinds of colored particle. The core of each particle is made of a transparent melamine-formaldehyde resin sphere, which is colored red, green and blue, respectively. The core is covered with two layers, the inner layer is made of color-former and the outer one cuprous iodide. The colored core only plays a role of color separation filter, and the final image is obtained by the reaction of the color-former. Since the CuI layer makes the beads conductive, only a mono-layer of the beads covers the charged photoconductor.
The process of image reproduction is as follows:
1) The filter beads are brought into contact with the charged photoconductor to forma color filter layer on the photoconductor.
2) The photoconductor covered with the filter beads is exposed to an image to give rise to an imagewise charge pattern thereon.
3) The originally existing electrostatic attraction between the beads and the photoconductor disappears at the exposed area, and these beads are easily removed from the photoconductor surface.
4) The remaining beads are transferred to the image receiving paper after blanket exposure, and then heated whereby the color-former in the beads sublimes onto the paper to form a dye image.
The resolving power of the copy using 20∼40-μm-diameter beads was 4 lines/mm.
The black density was about 1. 2 and the background is 0.13.
In contrast to the conventional Carlson process, which needs three cycles of imaging.
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