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US 12,007,235 B2Granted
Magnetic encoder
AssigneeSMC Corporation
InventorsRyuichi Masui, Naohiro Ishizawa
Life of this patent
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Abstract
A magnetic encoder is provided with a first member including a first wall part that has formed therein an insertion through-hole through which a rotary body is passed, and a second member including a second wall part. A permanent magnet and a magnetic sensor for detecting a change in the magnetic field formed by the permanent magnet are disposed between the first wall part and the second wall part. In this configuration, the first member and the second member are composed of a soft steel that contains at most 3.0 wt % of carbon.
Claims6
A magnetic encoder having
- a permanent magnet configured to rotate accompanying rotation of a rotating body constituting a rotational drive unit, and
- a magnetic sensor configured to detect a change in a magnetic field of the permanent magnet,
- the magnetic encoder comprising:
- a first member including a first wall portion in which an insertion hole is formed through which the rotating body is passed;
- and
- a second member including a second wall portion sandwiching the permanent magnet and the magnetic sensor between the second wall portion and the first wall portion,
- wherein the first member and the second member are made of a mild steel containing up to 3.0% by weight of carbon, and
- wherein a coercivity of the first member and the second member is less than or equal to 3 oersted.
5 more elements
Dependencies are inferred from the claim text.