Accelerometer with a cantilever beam formed as part of the housi

Details Accelerometer with a cantilever beam formed as part of the housi Accelerometer with a cantilever beam formed as part of the housi

1995-04-18

1997-05-06

Williams, Hezron E.

Measuring and testing

Speed, velocity, or acceleration

Acceleration determination utilizing inertial element

7351416, G01P 1508

Patent

active

056273150

ABSTRACT:
An accelerometer is provided in which a magnet structure is encapsulated within a distal end of a cantilever beam that is formed as an integral part of a housing structure. The cantilever beam, the distal end and the housing structure are formed of a nonmagnetic material, such as plastic, during a single injection molding procedure. The magnetic structure within the distal end of the cantilever beam can comprise two magnets associated with a pole piece and disposed within an opening formed in a nonmagnetic bracket. Although many types of magnet structures are possible within the scope of the present invention, a particularly preferred magnet structure comprises two magnets that are arranged in opposite polarity with the opposite poles of the two magnets being located adjacent to each other on opposite sides of a centerline. The magnet structure can be held in place during the injection molding process by the magnetic attraction between the magnet structure and a ferromagnetic portion of the mold. The magnetically sensitive component, which is held in place within a wall of the housing structure, can be a Hall effect element.

REFERENCES:
patent: 4321464 (1982-03-01), Miller
patent: 4825697 (1989-05-01), Huber
patent: 4849655 (1989-07-01), Bennett
patent: 4870864 (1989-10-01), Io
patent: 4967598 (1990-11-01), Wakatsuki et al.
patent: 5036705 (1991-08-01), Gaines
patent: 5220834 (1993-06-01), Saito et al.
patent: 5359286 (1994-10-01), Kaiser et al.
patent: 5373740 (1994-12-01), Yoshida et al.
patent: 5400654 (1995-03-01), Kaiser et al.

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