Multi-resonant coupled system for flat panel actuation
AssigneeNVF Tech Ltd
InventorsNeil John Harris, James East
Life of this patent
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Abstract
A system includes a flat panel display having a panel resonant frequency response corresponding to a composition, shape, and structure of the flat panel display; and an actuator having an actuator resonant frequency response corresponding to a composition, size, and shape of the actuator; in which the actuator is mechanically-coupled to the flat panel display at a mechanical drive point, in which a coupled resonant frequency response of the system is lower than the panel resonant frequency response of the flat panel display.
Claims19
A system having a coupled resonant frequency response comprising a plurality of resonant frequencies, the system comprising:
- a bending-wave panel having a panel resonant frequency response corresponding to a composition, shape, and structure of the bending-wave panel, the panel resonant frequency response comprising a plurality of resonant frequencies including a lowest resonant frequency useful for acoustic output;
- and
- an actuator having an actuator resonant frequency response corresponding to a composition, size, and shape of the actuator, the actuator resonant frequency response comprising an actuator resonant frequency at about ⅔ to one octave below the lowest resonant frequency of the bending-wave panel useful for acoustic output;
- wherein the actuator is mechanically-coupled to the bending-wave panel at a mechanical drive point, and wherein a resonant frequency of the coupled resonant frequency response of the system in a range from 300 Hz to 600 Hz is lower than the lowest resonant frequency useful for acoustic output of the bending-wave panel.
A method comprising:
- determining, for a bending-wave panel, a lowest resonant mode frequency of the bending-wave panel suitable for acoustic output;
- determining, for the lowest resonant mode frequency of the bending-wave panel suitable for acoustic output, a mechanical drive point for the bending-wave panel at the lowest resonant mode frequency;
- determining, for the mechanical drive point, a mechanical impedance of the bending-wave panel at the mechanical drive point;
- and
- selecting an actuator to mechanically couple to the bending-wave panel at the mechanical drive point, the selection of the actuator comprising:
- matching the mechanical impedance of the actuator to the mechanical impedance of the bending-wave panel at the mechanical drive point for the resonant mode frequency;
- tuning a frequency of the actuator such that the frequency of the actuator is at a second, different resonant frequency than the resonant mode frequency of the bending-wave panel at about ⅔ to one octave below the lowest resonant frequency of the bending-wave panel suitable for acoustic output,
- wherein a coupled system comprising the bending-wave panel and the actuator attached to the mechanical drive point has a resonant frequency in a range from 300 Hz to 600 Hz that is lower than the lowest resonant mode frequency of the bending-wave panel suitable for acoustic output.
Dependencies are inferred from the claim text.