ENCODER WITH MAGNETIC-FIELD-SHIELDING PLATE

WIPO Patent Application WO/2020/053992

A1

This encoder (20) comprises: an encoder shaft (1) having a shaft coupling mounted on the lower end thereof; an encoder base member (7) having formed therein a hole that the encoder shaft (1) passes through; a magnet (2) mounted on the upper end of the encoder shaft (1); an electric circuit board (4) having, mounted thereon, a magnetic sensor (3) for detecting the magnetic field of the magnet (2) and a calculation element (41) for calculating the rotation angle of the encoder shaft (1) on the basis of the output of the magnetic sensor (3); an electric circuit board holding member (5) that has a cylindrical shape with both ends open and has the electric circuit board (4) fixed to the upper end thereof; and a magnetic-field-shielding plate (6) that comprises a part that overlaps with the cylindrical part of the electric circuit board holding member (5). A gap is formed in the part of the magnetic-field-shielding plate (6) that overlaps with the cylindrical part of the electric circuit board holding member (5) when viewed along the central axis of the electric circuit board holding member (5), and the encoder base member (7) and electric circuit board holding member (5) are in contact with each other via the gap.

OKUMA MASASHI (JP)
NIMURA MASANORI (JP)
KANAMORI DAISUKE (JP)
NOGUCHI TAKUYA (JP)

PCT/JP2018/033832

March 19, 2020

September 12, 2018

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MITSUBISHI ELECTRIC CORP (JP)

G01D5/245

WO2013094042A1	2013-06-27
WO2013084270A1	2013-06-13

JP2018042332A	2018-03-15
JPH08274486A	1996-10-18
JP2018057080A	2018-04-05
JP2017163682A	2017-09-14
JP2013076715A	2013-04-25
US20110234208A1	2011-09-29

TAKAMURA, Jun (JP)

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