Abstract: A photoplotter includes an image-projecting system movable with respect to a photosensitive material at relatively fast and efficient speeds and over relatively large areas. The photoplotter comprises a coherent fiber optic bundle for transmitting an image from the image-defining optics to the image-projecting system. The image can be moved over selective portions of the photosensitive material by moving the image-projecting system parallel to the material and rotated by rotating one end of the fiber optic bundle.

Abstract: An electrographic input system comprises a set of a first plurality of electrical conductors and a second plurality of electrical conductors arranged so as to form a coordinate system. The conductors of the first plurality are sequentially energized at a fast scan rate so as to provide a high intensity electric field in proximity to each energized conductor. A moveable probe is provided for sensing the electric field provided by each of the first plurality so as to provide a first signal responsively thereto. A selected number of the first plurality of conductors is energized at a slow scan rate so as to provide a plurality of second signals, each representative of the electrical field intensity strength between the probe and each of the selected number of conductors energized during the slow scan. Means are provided for determining the centroid of the second signals and for generating a third signal in response thereto.