Abstract: An electron beam pattern transfer system is disclosed which includes a photoelectric transducing mask disposed within a vacuum container and adapted to transfer a photoelectron beam pattern corresponding to a pattern of the mask onto a sample according to an amount of an incident light, a DC voltage generator connected to vary a voltage applied between the mask and the sample, and a focusing coil of a superconductive magnet for creating a magnetic field of a predetermined intensity between the mask and the sample. When a mask-to-sample distance and/or magnetic field intensity varies undesirably, the variation is electrically detected by detectors. In order to compensate for the defocusing of the photoelectron beam pattern on the sample due to the above-mentioned variation, a microprocessor automatically calculates an amount of correction with respect to the intensity of the electric field between the mask and the sample, on a real-time basis and supplies its control signal to the DC voltage generator.

Abstract: An image processing system is disclosed which includes: a control computer which has a CPU and a main memory therein; and an image memory section which is connected to the CPU through an interface and which has an image memory for digitally storing image data, a memory controller and an image processor. A memory area as part of the main memory is independently allocated to store as a register area data transferred through a privately leased data bus which bypasses the interface between the control computer and the image memory section. When random access operation of the image data with respect to the image memory is performed, the data transfer between the CPU and the image memory section can be performed through the memory area (register area) and the special data bus without going through the interface.

Abstract: The invention provides an improved image memory device including an image processing memory unit incorporated into a universal image processing device and an address switching control circuit connected thereto, wherein an address data for raster display and an address data fed from an external input-output device are periodically selected by an address switching control circuit for supply to the image processing memory unit so that the memory unit may be accessed by an external input-output device without intercepting the raster display with remarkably reduced data transfer time.