Pickup coil having adjustable characteristic frequency
AssigneeHonda Motor Co., Ltd.
InventorMasaki Yamazaki
Life of this patent
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Abstract
A pickup coil includes a sensing unit having an iron core, a permanent magnet magnetically coupled to a rear end position of the iron core, and a coil for sensing a change of magnetic flux occurring in the iron core; and a supporting frame member. The sensing unit is molded with a cup-shaped resin case. The sensing unit is integrally molded with the supporting frame member and is mounted on a mounting object via the supporting frame member. A plurality of weight units for adjusting a characteristic frequency of the coil is stored in a weight storage section formed inside the resin case at a position spaced away from the supporting frame member. The weight storage section is sized such that one or more weight units are accommodated therein.
Claims20
A pickup coil comprising a sensing unit, a supporting frame member, and a weight member;
- said sensing unit comprising:
- an iron core;
- a permanent magnet magnetically coupled to the iron core;
- and
- a coil for sensing a change of magnetic flux occurring in the iron core;
- wherein the iron core, the permanent magnet, and the coil are integrally molded with the supporting frame member, and are configured to be mounted on a mounting object via the supporting frame member;
- and
- wherein the weight member is mounted on an end portion of the sensing unit which is spaced away from the supporting frame member.
A pickup coil for sensing a rotary speed of an engine, said pickup coil comprising:
- a sensing unit;
- a supporting frame attached to said sensing unit;
- and
- a weight member attached to an end portion of the sensing unit at a position spaced away from said supporting member;
- said weight member comprising at least one weight unit;
- wherein said sensing unit is disposed in a molded cup-shaped resin case;
- and
- wherein said weight member is operatively attached to said resin case.
A pickup coil for sensing a rotary speed of an engine, said pickup coil comprising, comprising:
- a sensor assembly disposed in a molded cup-shaped resin case, said sensor assembly comprising
- an iron core having a rectangular columnar shape;
- a permanent magnet magnetically coupled with the iron core;
- a base plate magnetically coupled with the permanent magnet;
- a bobbin having said iron core penetrated therethrough;
- and
- a coil wound around said bobbin;
- a supporting frame attached to said sensor assembly;
- and
- a weight member attached to an end portion of the sensor assembly at a position spaced away from the supporting member, said weight member comprising at least one weight unit.
Dependencies are inferred from the claim text.