Rotary speed sensor
AssigneeProterial, Ltd.
InventorKazuhiko Tomita
Life of this patent
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Abstract
A rotary speed sensor according to an embodiment includes: a sensor component including magnetic detection elements; a magnet on a bottom surface side of the sensor component; and a magnetic panel arranged between the bottom surface of the sensor component and the magnet and made of a magnetic material. An opening penetrating in a first direction that is an arrangement direction of the sensor component, the magnetic panel and the magnet is formed in the magnetic panel. A wall surface of the opening includes: an inner wall having a constant diameter; and an edge being closer to the sensor component than the inner wall and having a variable diameter. The farther from the bottom surface in the first direction a part of the edge is, the closer to a center of the opening the part is.
Claims3
A rotary speed sensor comprising:
- a sensor component including a first surface, a second surface opposite to the first surface, a first magnetic detection element arranged between the first surface and the second surface, and a second magnetic detection element arranged between the first surface and the second surface to separate from the first magnetic detection element;
- a magnet on the second surface side of the sensor component;
- and
- a magnetic panel arranged between the second surface of the sensor component and the magnet,
- wherein an opening penetrating in a first direction that is an arrangement direction of the sensor component, the magnetic panel and the magnet is formed in the magnetic panel,
- a wall surface of the opening includes:
- an inner wall having a constant diameter;
- and
- an edge being closer to the sensor component than the inner wall and having a variable diameter, and
- the farther from the second surface in the first direction a part of the edge is, the closer to a center of the opening the part is.
Dependencies are inferred from the claim text.