Dampening mechanical modes of a haptic actuator using a delay
First Claim
Patent Images
1. An electronic device, comprising:
- an enclosure;
a haptic actuator mounted within the enclosure and comprising a movable mass; and
a processor configured to apply a series of input waveforms to the haptic actuator,wherein;
the applied series of input waveforms moves the movable mass to provide a haptic output;
the processor applies a first input waveform, a second input waveform, and a third input waveform in the series of input waveforms with a first delay between the first input waveform and the second input waveform, and a second delay, different from the first delay, between the second input waveform and the third input waveform; and
the processor configures the first and second delays to prevent the movable mass from contacting the enclosure.
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Abstract
Described herein is a method for determining a higher order resonance mode frequency of a haptic actuator for an electronic device. The higher order resonance mode frequency may correspond to a frequency in which a mass of the haptic actuator exhibits undesired movement. The movement may cause the mass to collide or otherwise impact an enclosure of the haptic actuator. Once the higher order resonance mode frequency is determined, a delay or a polarity inversion may be added to one or more of a series of input waveforms to suppress or brake the undesired movement.
534 Citations
18 Claims
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1. An electronic device, comprising:
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an enclosure; a haptic actuator mounted within the enclosure and comprising a movable mass; and a processor configured to apply a series of input waveforms to the haptic actuator, wherein; the applied series of input waveforms moves the movable mass to provide a haptic output; the processor applies a first input waveform, a second input waveform, and a third input waveform in the series of input waveforms with a first delay between the first input waveform and the second input waveform, and a second delay, different from the first delay, between the second input waveform and the third input waveform; and the processor configures the first and second delays to prevent the movable mass from contacting the enclosure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An electronic device, comprising:
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a housing; a haptic actuator mounted within the housing and comprising a mass; and a processor configured to apply a series of input waveforms to the haptic actuator, wherein; the applied series of input waveforms moves the mass along an axis to provide a haptic output; the applied series of input waveforms comprises a first input waveform;
a delay period, after the first input waveform, in which the haptic actuator is not driven; and
a second input waveform applied after the delay period; andthe processor configures the delay period to prevent the mass from contacting the housing of the electronic device. - View Dependent Claims (10, 11, 12, 13)
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14. A method of operating a haptic actuator within an electronic device, the method comprising:
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determining a first delay based, at least in part, on a first higher order resonance mode of the haptic actuator; determining a second delay based, at least in part, on a second higher order resonance mode of the haptic actuator; and sequentially applying a first, second, third, and fourth input waveform to the haptic actuator during respective first, second, third, and fourth sequential time periods to cause a mass of the haptic actuator to move according to a designed resonance mode and provide a haptic output, wherein; the designed resonance mode is distinct from the first and second higher order resonance modes; the first delay is inserted at a beginning of the second time period before the second input waveform; the second delay is inserted at a beginning of the third time period before the third input waveform; the first delay and the second delay are inserted at a beginning of the fourth time period before the fourth input waveform; and the first delay and the second delay suppress motions of the mass according to the first higher order resonance mode and the second higher order resonance mode. - View Dependent Claims (15, 16, 17, 18)
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Specification