Use of an accelerometer to control vibrator performance

Details Use of an accelerometer to control vibrator performance Use of an accelerometer to control vibrator performance

2007-09-17

2011-12-27

Duda, Rina (Department: 2837)

Electricity: motive power systems

Impact, mechanical shock, or vibration-producing motors

C318S461000

Reexamination Certificate

active

08084968

ABSTRACT:
A mobile device includes a vibrator, an accelerometer that senses a parameter of rotation, and a processor. The vibrator includes a drive motor and a drive circuit. The accelerometer senses a speed of rotation of the vibrator. The processor analyzes the sensed speed of rotation and generates a drive voltage that is received by the drive circuit to adjust the drive motor to produce a pre-determined, desired rotational speed. In another embodiment, the accelerometer senses an amplitude of a vibration produced by the vibrator. The processor analyzes the sensed amplitude of a vibration and generates a drive voltage that is received by the drive circuit to adjust the drive motor to produce a pre-determined, desired vibration amplitude. The processor may also compare the sensed parameter with a pre-determined desired parameter of rotation and generate a signal responsive to a result of the comparison and based on stored vibrator calibration curves.

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