A three-dimensional pattern display apparatus has been developed using a 5 inch
X-
Y oscilloscope as the displayer. The main point of the development consists of a new type of digital to analog converter in which reading of spot positions of extremely high precision is possible. The new digital-analog converter is specified by the following points: the maximum output is 10 volts, the zero level drift is within 10μV, the linearity is better than 0.1%, the response speed is faster than 1μ second after signal injection. The precise spot readers make this apparatus very convenient, being able to read
X and
Z coordinates of any designated spot in a pattern. This article shows a method to realize technically such display apparatus.
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