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US 2022/0103045 A1Published application
Voice coil motor
AssigneeOMRON Corporation
InventorRyuji KAWAMOTO
Life of this patent
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Abstract
A voice coil motor (VCM) according to one or more embodiments may include a casing, a permanent magnet, a yoke and iron-core, a bobbin, and a coil part. The coil part may include a drive and primary coil serving as a drive coil and a primary coil of a displacement sensor including a differential transformer, the drive and primary coil being interlinked with a magnetic flux by the permanent magnet, and two secondary coils of the displacement sensor. The yoke and iron-core may be disposed in a central space defined in the coil part, and serves as an iron core of the displacement sensor.
Claims9
A voice coil motor comprising:
- a casing having a bottom end-closed cylindrical shape;
- a permanent magnet having a cylindrical outer peripheral face, and being disposed on a central bottom portion in the casing;
- a yoke disposed opposite the permanent magnet in the casing, and being equal in diameter to the permanent magnet;
- a bobbin;
- and
- a coil part wound around the bobbin, wherein
- the coil part comprises:
- a drive and primary coil serving as a drive coil and a primary coil of a differential transformer, the drive and primary coil being interlinked with a magnetic flux by the permanent magnet;
- and
- two secondary coils of the differential transformer, and
- the yoke is disposed in a central space defined in the coil part, and serves as an iron core of the differential transformer.
8 more elements
Dependencies are inferred from the claim text.