アナログ-ディジタル標準スケール

抄録

A new linear positioning transducer, called the DELPAX-63 L, has been developed.
This new transducer, is a stable electronic analog-digital standard scale providing the linear distance measurment ability of high accuracy for machine tools and other machine industries.
The DELPAX-63 L, as shown Photo. 1, consists of one detector coil which is the precisely spaced two single layer solenoid on stainless steel bobbin and scale which is a square shaped steel screw thread with precisely 2mm lead on long lengths. It is advantageous feature that moving element as scale has not coils and lead wire.
Movement of the detector coil along the scale gives an output with sinusoidal amplitude which is variated from zero to maximum value as every pitch of the scale.
Any positioning between scale pitches is obtained by rotation of the scale.
Useful results have been obtained in experiments, as follows:
Eccentricitz of the scale in detector coil and variation of external electromagnetic field are neglected for accuracy.
Accuracy has not been influenced by the residual pitch error in the detector coil and the threaded screw so that a number of turns in coil averaged pitch error over all length of the coil.
Accuracy: measured total pitch error over the scale (350mm) is less than 0.01mm
Sensitivity: output voltage of the detector coil is about 0.01 volt at maximum, output of amplifier is 1. 4 volt/10μ
Repeatability: repeated error is less than 0.001mm