| 摘要 |
PROBLEM TO BE SOLVED: To generate a precise complete roundness pattern without being limited by a used transformation element by correcting out-of-roundness errors provided in a cosine function transformation element and a sine function transformation element outputting a cosine functional value and a sine functional value outputted answering to an inputted angular signal. SOLUTION: The angular signalθis inputted to an out-of-roundness correction circuit 26, and reads out the out-of-roundness correction value data to be converted into an analog value by a D/A converter 27. The out-of-roundness correction value data are multiplied by a radial signal corrected with radial linearity outputted from the D/A converter 29 for radial signal by an out-of- roundness correcting multiplier 30 to become an out-of-roundness correction signal. One of the out-of-roundness correction signal is outputted to an X out-of- roundness correcting adder 34, and is added to an uncorrected X coordinate value outputted by an X coordinate multiplier 31, and corrects an error to be outputted, and another one is outputted to a Y one-of-roundness correcting adder 35, and is added to an uncorrected Y coordinate value outputted by a Y coordinate multiplier 32, and corrects the error to be outputted.
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