Dampening Mechanical Modes of a Haptic Actuator Using a Delay
AssigneeApple Inc.
InventorDenis G. Chen
Life of this patent
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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.
Claims21
An electronic device, comprising:
- a processing unit;
- a memory;
- and
- a haptic actuator;
- wherein
- the memory is operative to store instructions for generating a plurality of input waveforms to drive the haptic actuator;
- and
- the processing unit is operative to determine a delay to be provided between alternating input waveforms provided to the haptic actuator, the delay operative to suppress a higher order resonance mode response of an actuator mass of the haptic actuator.
A method for determining a higher order resonance mode frequency of an actuator for an electronic device, comprising:
- providing a first series of input waveforms to the actuator to cause the actuator to move, the first series of input waveforms having a first period;
- providing a sweep of multiple subsequent series of input waveforms to the actuator, each subsequent series of input waveforms having a respective period that belongs to a set of monotonically incremented values with respect to the first period;
- identifying one or more periods that result in an actuator mass of the actuator impacting an internal portion of the actuator;
- and
- estimating the higher order resonance mode frequency of the actuator using the identified one or more periods.
A method for determining a delay that is provided between input waveforms applied as input to a haptic actuator, comprising:
- determining a higher order resonance mode frequency of the haptic actuator;
- determining a period of a higher order resonance mode;
- and
- determining the delay using the higher order resonance mode frequency and the period of the higher order resonance mode.
Dependencies are inferred from the claim text.