Damping vibrational wave reflections
First Claim
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1. A touch input detector, comprising:
- An acoustic transmitter configured to transmit a freely propagating acoustic signal through a touch input medium with a touch input surface, wherein the freely propagating acoustic signal from the acoustic transmitter has been allowed to freely propagate through the touch input medium in multiple directions to a plurality of receivers on a plurality axes of the touch input medium;
an acoustic receiver configured to receive the freely propagating acoustic signal that has been disturbed by a touch input contacting the touch input surface, wherein the timing of the incidence of the received signal on the acoustic receiver indicates at least a portion of a touch input location of the touch input on the touch input surface; and
an acoustic dampening material coupled to the touch input medium to dampen reflections of the freely propagating acoustic signal, wherein a thickness of the acoustic dampening material increases from a first edge of the acoustic dampening material to a second edge of acoustic dampening material, the thinner first edge of the acoustic dampening material is closer to the plurality receivers than the thicker second edge of the acoustic dampening material, the acoustic dampening material is configured to dampen at least a portion of the freely propagating acoustic signal reaching, via propagation through the touch input medium, the thinner first edge of the acoustic dampening material that is closer to the acoustic transmitter than the thicker second edge of the acoustic dampening material, and the first edge of acoustic dampening material and the second edge of acoustic dampening material at least in part define parallel edges of a strip of the acoustic dampening material coupled to a back surface of the touch input medium that is opposite a front surface of the touch input medium configured to receive the touch input and an attenuation property of the acoustic dampening material gradually varies across at least a portion of the acoustic dampening material.
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Abstract
A touch input detector is disclosed. The touch input detector includes an acoustic transmitter for transmitting an acoustic wave across a touch input medium. The touch input detector also includes an acoustic receiver for receiving the transmitted acoustic wave, wherein the timing of the incidence of the acoustic wave on the acoustic receiver indicates at least a portion of a touch input location on a surface of the touch input medium. The touch input detector further includes an acoustic dampening material coupled to the touch input medium to dampen reflections of the transmitted acoustic wave.
77 Citations
20 Claims
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1. A touch input detector, comprising:
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An acoustic transmitter configured to transmit a freely propagating acoustic signal through a touch input medium with a touch input surface, wherein the freely propagating acoustic signal from the acoustic transmitter has been allowed to freely propagate through the touch input medium in multiple directions to a plurality of receivers on a plurality axes of the touch input medium; an acoustic receiver configured to receive the freely propagating acoustic signal that has been disturbed by a touch input contacting the touch input surface, wherein the timing of the incidence of the received signal on the acoustic receiver indicates at least a portion of a touch input location of the touch input on the touch input surface; and an acoustic dampening material coupled to the touch input medium to dampen reflections of the freely propagating acoustic signal, wherein a thickness of the acoustic dampening material increases from a first edge of the acoustic dampening material to a second edge of acoustic dampening material, the thinner first edge of the acoustic dampening material is closer to the plurality receivers than the thicker second edge of the acoustic dampening material, the acoustic dampening material is configured to dampen at least a portion of the freely propagating acoustic signal reaching, via propagation through the touch input medium, the thinner first edge of the acoustic dampening material that is closer to the acoustic transmitter than the thicker second edge of the acoustic dampening material, and the first edge of acoustic dampening material and the second edge of acoustic dampening material at least in part define parallel edges of a strip of the acoustic dampening material coupled to a back surface of the touch input medium that is opposite a front surface of the touch input medium configured to receive the touch input and an attenuation property of the acoustic dampening material gradually varies across at least a portion of the acoustic dampening material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification