| 摘要 |
An input apparatus, for example a mouse or a track ball, comprises a member (104) which is rotatable by manipulation by a user. The rotation causes a change of a magnetic field, which change is detected by a detector (110). The member (104) in the apparatus in accordance with the invention comprises a non-homogeneous distribution (202, 204, 206, 112) of a soft-magnetic material which, upon rotation, changes a magnetic field (210) externally applied to the member by a magnet (108).
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