Seat belt retractor and seat belt device
First Claim
1. A seat belt retractor comprising:
- a spool for withdrawably retracting a seat belt, and a rotation angle detecting unit for detecting a rotation angle of the spool, wherein the rotation angle detecting unit includes a belt withdrawn amount sensing unit for detecting a predetermined rotation angle of the spool in a belt withdrawn direction, and wherein the belt withdrawn amount sensing unit comprises a Hall switch which includes a magnet for moving according to a predetermined rotation amount of the spool in the belt withdrawn direction of the spool and a Hall element which is controlled to be turned on or off by the magnet.
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Accused Products
Abstract
The disclosed seat belt retractor and seat belt device improve the reliability of a belt withdrawn amount sensing unit for detecting the withdrawn amount of a belt with a high accuracy. The seat belt retract may comprise a spool for withdrawably retracting a seat belt and a rotation angle detecting unit for detecting a rotation angle of the spool. The rotation angle detecting unit can be a belt withdrawn amount sensing unit for detecting a predetermined rotation angle of the spool in a belt withdrawn direction. The belt withdrawn amount sensing unit can comprise a Hall switch which includes a magnet for moving according to a predetermined rotation amount of the spool in the seat belt withdrawn direction of the spool and a Hall element which is controlled to be turned on or off by the magnet.
12 Citations
8 Claims
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1. A seat belt retractor comprising:
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a spool for withdrawably retracting a seat belt, and a rotation angle detecting unit for detecting a rotation angle of the spool, wherein the rotation angle detecting unit includes a belt withdrawn amount sensing unit for detecting a predetermined rotation angle of the spool in a belt withdrawn direction, and wherein the belt withdrawn amount sensing unit comprises a Hall switch which includes a magnet for moving according to a predetermined rotation amount of the spool in the belt withdrawn direction of the spool and a Hall element which is controlled to be turned on or off by the magnet. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A seat belt device comprising:
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a seat belt a seat belt retractor for retracting a seat belt;
a tongue slidably supported by the seat belt withdrawn from the seat belt retractor; and
a buckle for releaseably engaging the tongue, wherein the seat belt retractor comprises;
a spool for withdrawably retracting a seat belt, and a rotation angle detecting unit for detecting a predetermined rotation angle of the spool in a belt withdrawn direction, wherein the rotation angle detecting unit comprises a Hall switch which includes a magnet configured to move according to a predetermined rotation amount of the spool in the belt withdrawn direction of the spool and a Hall element which is controlled to be turned on or off by the magnet.
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8. A seat belt retractor comprising:
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a spool for withdrawably retracting a seat belt, and a Hall switch for detecting a predetermined rotation angle of the spool in a belt withdrawn direction, wherein the switch includes a magnet configured to move an amount corresponding to a predetermined rotation amount of the spool in the belt withdrawn direction of the spool and a Hall element which is configured to be placed in an on or off condition by the magnet.
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Specification