POSITION SENSING DEVICE

摘要

A position sensing device has a first magnetic flux transmission unit that includes first thin boards made of long shape magnetic material stacked along a board thickness direction and a second magnetic flux transmission unit that includes second thin boards made of long shape magnetic material stacked along the board thickness direction, for defining a gap space between the first and second magnetic flux transmission units when disposing the first and second magnetic flux transmission units on a rotating body. Further, the position sensing device includes first and second magnets disposed between both ends of the first and second magnetic flux transmission units. A Hall IC disposed on a mold part moves within the gap space along a gap space longitudinal direction relative to the rotating body for outputting a signal according to a density of a magnetic flux passing therethrough.

主权项

1. A position sensing device for detecting a position of a detection object that moves relative to a reference member, the position sensing device comprising:
a first magnetic flux transmission unit having a long shape and provided on one of the reference member or the detection object, the first magnetic flux transmission unit being formed by stacking a plurality of first thin boards in a board thickness direction, the plurality of first thin boards being made from magnetic material; a second magnetic flux transmission unit having a long shape and provided on the one of the reference member or the detection object, the first magnetic flux transmission unit being formed by stacking a plurality of second thin boards in the board thickness direction, the plurality of second thin boards being made from magnetic material, the board thickness direction of each of the plurality of second thin boards being parallel with the board thickness direction of each of the plurality of first thin boards, and a gap space being defined between the first and second magnetic flux transmission units; a first magnetic flux generation unit disposed at a position between one end of the first magnetic flux transmission unit and one end of the second magnetic flux transmission unit; a second magnetic flux generation unit disposed at a position between an other end of the first magnetic flux transmission unit and an other end of the second magnetic flux transmission unit; and a flux density detection unit outputting a signal according to a density of a magnetic flux passing therethrough, wherein the flux density detection unit is disposed on an other of the reference member or the detection object, and is movable within the gap space along a gap space longitudinal direction relative to the one of the reference member or the detection object.