Touch panel input device
First Claim
1. A touch panel input device comprising:
- a movable plate;
an input operation surface on a surface of said movable plate;
a support substrate facing said movable plate across an insulating gap;
a first conductor layer on a first surface of said movable plate facing said support substrate;
a second conductor layer on a second surface of said support substrate facing said movable plate;
pressure detecting means for detecting a pressure and a pressed position on said input operation surface based on a contact between said first and second conductor layers;
the pressure detecting means further including a voltage detection circuit operable to read a constant electric gradient formed across the movable plate, wherein the electric gradient at the pressed position is at a value proportional to a distance from a side of the moveable plate;
means for providing pressed position data indicating a position of said pressure;
a piezoelectric substrate mechanically fixed to one of said movable plate and said support substrate; and
means for applying a drive voltage to said piezoelectric substrate responsive to said pressure, whereby contracting and expanding of said piezoelectric substrate in response to said drive voltage vibrates the one of said movable plate and said support substrate to generate an input operation feeling.
1 Assignment
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Accused Products
Abstract
A piezoelectric substrate is fixed to the movable plate or the support substrate directly or through a drive electrode of the piezoelectric substrate. When a pressure on an input operation surface is detected, a drive voltage is impressed on the drive electrodes of the piezoelectric substrate. In response, the piezoelectric substrate vibrates the movable plate or the support substrate, thereby providing tactile feedback to an operator. Because the movable plate or the support substrate directly vibrates without an independent vibrating source, there is no energy loss or transmission delay caused by transmitting the vibration, and finely control of the contraction and expansion of the piezoelectric substrate allows fine control of the vibration. In one embodiment, the drive voltage is modulated with signals dependent on the location of the pressure. In another embodiment, the drive voltage is modulated with audio frequencies to create a speaker.
236 Citations
15 Claims
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1. A touch panel input device comprising:
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a movable plate; an input operation surface on a surface of said movable plate; a support substrate facing said movable plate across an insulating gap; a first conductor layer on a first surface of said movable plate facing said support substrate; a second conductor layer on a second surface of said support substrate facing said movable plate; pressure detecting means for detecting a pressure and a pressed position on said input operation surface based on a contact between said first and second conductor layers; the pressure detecting means further including a voltage detection circuit operable to read a constant electric gradient formed across the movable plate, wherein the electric gradient at the pressed position is at a value proportional to a distance from a side of the moveable plate; means for providing pressed position data indicating a position of said pressure; a piezoelectric substrate mechanically fixed to one of said movable plate and said support substrate; and means for applying a drive voltage to said piezoelectric substrate responsive to said pressure, whereby contracting and expanding of said piezoelectric substrate in response to said drive voltage vibrates the one of said movable plate and said support substrate to generate an input operation feeling. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A touch panel input device comprising:
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a movable plate; an input operation surface on a first surface of said movable plate; a support substrate disposed opposite to said movable plate across an insulating gap; a first conductor layer on a second surface of said movable plate facing said support substrate; a second conductor layer on a first surface of said support substrate facing said movable plate, the first and second conductor layers being separated by said insulating gap; an adhesive layer disposed between said movable plate and said support substrate; a piezoelectric substrate disposed within said insulating gap, said piezoelectric substrate having a pair of first and second driving electrodes which span a height of the piezoelectric substrate; pressure detecting means for detecting a pressure and a pressed position on said input operation surface based on a contact between said first and second conductor layers; the pressure detecting means further including a voltage detection circuit operable to read a constant electric gradient formed across the movable plate, wherein the electric gradient at the pressed position is at a value proportional to a distance from a side of the moveable plate; means for providing pressed position data indicating a position of said pressure; and means for applying a drive voltage to said piezoelectric substrate responsive to said pressure, whereby contracting and expanding of said piezoelectric substrate in response to said drive voltage vibrates the one of said movable plate and said support substrate to generate an input operation feeling. - View Dependent Claims (12, 13)
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14. A touch panel input device comprising:
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a movable plate; an input operation surface on a first surface of said movable plate; a support substrate disposed opposite to said movable plate across an insulating gap; a first conductor layer on a second surface of said movable plate facing said support substrate; a second conductor layer on a first surface of said support substrate facing said movable plate, the first and second conductor layers being separated by said insulating gap; a first adhesive layer disposed between said movable plate and said support substrate; a second adhesive layer disposed on a second surface of said support substrate; a piezoelectric substrate affixed to the second surface of said support substrate via said second adhesive layer, said piezoelectric substrate having a pair of first and second driving electrodes which span a height of the piezoelectric substrate; pressure detecting means for detecting a pressure and a pressed position on said input operation surface based on a contact between said first and second conductor layers; the pressure detecting means further including a voltage detection circuit operable to read a constant electric gradient formed across the movable plate, wherein the electric gradient at the pressed position is at a value proportional to a distance from a side of the moveable plate; means for providing pressed position data indicating a position of said pressure; and means for applying a drive voltage to said piezoelectric substrate responsive to said pressure, whereby contracting and expanding of said piezoelectric substrate in response to said drive voltage vibrates the one of said movable plate and said support substrate to generate an input operation feeling. - View Dependent Claims (15)
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Specification