Absolute encoder
First Claim
1. An absolute encoder for determining a rotation amount of a main spindle that rotates a plurality of revolutions, the absolute encoder comprising:
- a first drive gear configured to rotate in accordance with rotation of the main spindle;
a first driven gear that engages with the first drive gear;
a second drive gear configured to rotate in accordance with rotation of the first driven gear;
a second driven gear that engages with the second drive gear;
an angular sensor configured to detect a rotation angle at which a second rotating body is rotated in accordance with rotation of the second driven gear;
a third drive gear configured to rotate in accordance with rotation of the first driven gear;
a third driven gear that engages with the third drive gear;
an intermediate rotating body provided with respect to the second drive gear and the third drive gear; and
a second angular sensor configured to detect a rotation angle at which a third rotating body is rotated in accordance with rotation of the third driven gear;
wherein, in a direction of an axial line of rotation of the intermediate rotating body, a direction of a reaction force applied to the intermediate rotating body due to rotation of the second drive gear is set to be opposite to a direction of a reaction force applied to the intermediate rotating body due to rotation of the third drive gear.
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Accused Products
Abstract
The present invention provides an absolute encoder suitable for reduction in thickness. An absolute encoder, for determining a rotation amount of a main spindle that rotates a plurality of revolutions, includes a first drive gear configured to rotate in accordance with rotation of the main spindle; a first driven gear that engages with the first drive gear; a second drive gear configured to rotate in accordance with rotation of the first driven gear; a second driven gear that engages with the second drive gear; and an angular sensor configured to detect a rotation angle at which a second rotating body is rotated in accordance with rotation of the second driven gear.
15 Citations
5 Claims
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1. An absolute encoder for determining a rotation amount of a main spindle that rotates a plurality of revolutions, the absolute encoder comprising:
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a first drive gear configured to rotate in accordance with rotation of the main spindle; a first driven gear that engages with the first drive gear; a second drive gear configured to rotate in accordance with rotation of the first driven gear; a second driven gear that engages with the second drive gear; an angular sensor configured to detect a rotation angle at which a second rotating body is rotated in accordance with rotation of the second driven gear; a third drive gear configured to rotate in accordance with rotation of the first driven gear; a third driven gear that engages with the third drive gear; an intermediate rotating body provided with respect to the second drive gear and the third drive gear; and a second angular sensor configured to detect a rotation angle at which a third rotating body is rotated in accordance with rotation of the third driven gear; wherein, in a direction of an axial line of rotation of the intermediate rotating body, a direction of a reaction force applied to the intermediate rotating body due to rotation of the second drive gear is set to be opposite to a direction of a reaction force applied to the intermediate rotating body due to rotation of the third drive gear. - View Dependent Claims (2, 3, 4, 5)
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Specification