Patent ID: 11913784
Assignee: MINEBEA MITSUMI IN.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 1:
2. An absolute encoder comprising:
a first drive gear configured to rotate in accordance with rotation of a main spindle;
a first permanent magnet provided on a top end side of the first drive gear;
a first angle sensor configured to detect a rotation angle of the first drive gear, in accordance with a change in magnetic flux generated from the first permanent magnet;
a first driven gear of a central axis is perpendicular to a central axis of the first drive gear, the first driven gear engaging with the first drive gear;
a second drive gear coaxially provided with the first driven gear, the second drive gear being configured to rotate in accordance with rotation of the first driven gear;
a second driven gear of which a central axis is perpendicular to the central axis of the first driven gear, the second driven gear engaging with the second drive gear;
a second permanent magnet provided on a top end side of the second driven gear; and
a second angle sensor configured to detect a rotation angle of the second driven gear, in accordance with a change in magnetic flux generated from the second permanent magnet,
wherein a reduction ratio between the first drive gear and the first driven gear is set to a value for mitigating an effect of backlash between the first drive gear and the first driven gear, the backlash resulting in an error in the rotation angle of the second driven gear.