US 9,175,986 B2 · Separate linear encoder

Abstract

In a separate linear encoder, a scale is further provided with an ABS track that is arranged in parallel with an INC track and a detection head includes an ABS detection portion that reads the ABS track. The separate linear encoder includes a calculation portion that obtains a yaw angle of the detection head with respect to a scale based on a gap between an INC detection portion and an ABS detection portion and a difference amount between a position value of the INC track, which is detected by the INC detection portion, and a position of the ABS track, which is detected by the ABS detection portion. The calculation portion also obtains a signal strength based on two-phase sine wave signals that are output from the INC detection portion. The separate linear encoder further includes a display device that displays a plurality of yaw angles and the signal strengths corresponding to the respective yaw angles.

Claims10

Dependent claims

A separate linear encoder comprising:

a scale provided with a main track;
a detection head including a main detection portion to read the main track, and being relatively movable to the scale,
an angle detection track arranged in parallel with the main track on the scale,
an auxiliary detection portion to read the angle detection track, included in the detection head;
a first calculation device to obtain a yaw angle of the detection head with respect to the scale based on a gap between the main detection portion and the auxiliary detection portion, and based on a difference amount between a position value of the main track detected by the main detection portion and a position value of the angle detection track detected by the auxiliary detection portion;
a second calculation device to obtain a signal strength based on an output signal from the main detection portion;
and
a display device to display relationships between a plurality of yaw angles and signal strengths corresponding to the respective yaw angles.

5 more elements

Dependencies are inferred from the claim text.

Separate linear encoder

Life of this patent

Separate linear encoder

Life of this patent

Abstract

Claims10