![]() An ASCII text data file which describes the size and shape of the apertures used by a photo plotter for any one photoplot. ![]() For example, laser photoplotters don't need to know whether an aperture is a flash or draw, so a modern-day aperture list might leave that datum out.Īperture list - 1. Some aperture lists leave out certain of those types of data. A line of textual data in an aperture list describing the index names (D code and position), the shape, the usage (flash or draw) and the X and Y dimensions of an aperture. A vector photo plotter plots images from a CAD database on photographic film in a darkroom by drawing each line with a continuous lamp shined through an annular-ring aperture, and creating each shape (or pad) by flashing the lamp through a specially sized and shaped aperture. An aperture is mostly opaque, but with a transparent portion that controls the size and shape of the light pattern. A small, thin, trapezoidal piece of plastic used to limit and shape a light source for plotting light patterns on film, and mounted in a mechanical disk called an "aperture wheel" which in turn is mounted on the lamp head of a vector photoplotter. The index of the aperture is its Position (a number used in an aperture list to identify an aperture) or D code. An indexed shape with a specified x and y dimension, or line-type with a specified width, used as a basic element or object by a photo plotter in plotting geometric patterns on film. These anodes are used to concentrate and accelerate the electron beam for focusing. In a cathode-ray tube, the electrodes connected to a source of positive potential. The positive element such as the plate of a vacuum tube the element to which the principal stream of electrons flows. Aluminum oxide (Al 2 O 3 )Īnalog circuit ? A circuit in which the output varies as a continuous function of the input, as contrasted with digital circuit.Īnode - 1. It can withstand continuously high temperatures and has a low dielectric loss over a wide frequency range. Examples of active devices which fit one or more of the above definitions: transistors, rectifiers, diodes, amplifiers, oscillators, mechanical relays and almost all IC's (Contrast with passive component )ĪlN ?Aluminum Nitride, a compound of aluminum with nitrogen.ĪlN Substrate ?A substrate of aluminum nitride.Īlumina ?A ceramic used for insulators in electron tubes or substrates in thin-film circuits. Any device that switches or amplifies by the application of low-level signals. ![]() A device that requires an external source of power to operate upon its input signal(s). A component which adds energy to the signal it passes. ![]()
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