| 摘要 |
A miniature magnetic device package for use in applications as small as 5 mm as disclosed. Three embodiments of the invention are provided. In one embodiment, a magnetic encoder includes a magnetic flux responsive element, such as a Hall effect device, sandwiched between a pair of pole pieces, forming a subassembly. A resin, such as epoxy or a thermoplastic material is overmolded over the subassembly forming a housing. The magnetic flux responsive element is configured such that its major axis is generally parallel with a major axis of the housing, thus providing a sensor package with a footprint around 5mm. The flux concentrators may be configured in an L-shape to provide magnetic focusing adjacent a sensing face of the housing to focus flux toward the magnetic encoder and the Hall effect device. In a second embodiment of the invention, a magnetic sensor is provided. In this embodiment, a magnetic flux responsive element is sandwiched between a magnet and a flux concentrator. The assembly of the magnetic flux responsive element, flux concentrator and magnet is overmolded by a thermoplastic material. In a third embodiment, a magnetic flux responsive element is overmolded with a magnetic resin forming a magnetic sensor.
|
