Cylindrical encoder
First Claim
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1. A cylindrical encoder, comprising:
- a cylinder having a coding surface disposed about a rotational axis, the coding surface having a series of code lines that spiral about the rotational axis; and
an imaging system sensing movement of the series of code lines when the cylinder rotates about the rotational axis.
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Abstract
A cylindrical encoder has a cylinder with a coding surface that is disposed about a rotational axis. The coding surface has code lines that spiral along the cylinder about the rotational axis. Resolution depends on the pitch, or spacing, of the code lines, and on the angle at which the code lines are oriented to the rotational axis. An imaging system positioned for optical coupling to the coding surface senses a succession of moving code lines as the cylinder rotates about the rotational axis.
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Citations
11 Claims
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1. A cylindrical encoder, comprising:
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a cylinder having a coding surface disposed about a rotational axis, the coding surface having a series of code lines that spiral about the rotational axis; and
an imaging system sensing movement of the series of code lines when the cylinder rotates about the rotational axis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification