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| The history of '''electrovibration''' goes back to 1954. It was first discovered by accident and [[A. H. W. S. E. Mallinckrodt|Mallinckrodt]] reported “... that dragging a dry finger over a conductive surface covered with a thin insulating layer and excited with a 110 V signal, created a characteristic rubbery feeling”.<ref name=Mallinckrodt>A. H. W. S. E. Mallinckrodt, "Perception by the Skin of Electrically Induced Vibrations," Science, 1953.</ref> In their experiment, the finger and the metal surface create a capacitive setup. The attraction force created between the finger and the surface was too weak to perceive but it generated a rubbery sensation when the finger was moving on the surface. This sensation was named as electrovibration by the group. Today, Senseg<ref>[http://senseg.com Senseg]</ref> and Disney Research<ref>[http://www.disneyresearch.com/research/projects/hci_teslatouch_drp.htm?v=y&rnd=1316790008655 Disney Research: TeslaTouch]</ref><ref>{{cite journal
| | Pals simply call her Hiroko. Wisconsin is wherever her residence is and she enjoys each individual day dwelling there. Participating in with canines is a person of the items she enjoys most. Right after remaining out of his task for decades he grew to become a manufacturing and distribution officer and she'll be promoted shortly. Examine out her web site right here: http://aliance-brother.com/rss.php?es=zapatillas-nike-running-baratas-00833961.php<br><br> |
| | last = Bau
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| | first3 = A.
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| | last4 = Harrison
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| | first4 = C.
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| | title = TeslaTouch: Electrovibration for Touch Surfaces
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| | journal = Proceedings of the 23rd Annual ACM Symposium on User Interface Software and Technology (UIST)
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| | volume =
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| | issue =
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| | pages = 283–292
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| | publisher = ACM
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| | location = New York, NY
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| | year = 2010
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| | language =
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| | url = http://chrisharrison.net/projects/teslatouch/teslatouchUIST2010.pdf
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| |doi = 10.1145/1866029.1866074
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| }}</ref> are developing technology that could bring electrovibration to modern touchscreen devices.
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| == History ==
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| "In summer of 1950, E Mallinckrodt noted that a certain shiny brass electric light socket did not feel as smooth when the light was burning as it did with the light off". Then Mallinckrodt created a setup to investigate the effect scientifically. He connected an aluminum plate through a variable current limiting resistor to a 60 Hz, 110v power supply. Half of the aluminum plate was coated with an [[Electrical insulation|insulating]] [[varnish]] while the rest was left uncoated. As a result of the test he identified that the feeling of friction only appears when there is an insulating barrier between the conductive surface and the sliding finger. He concluded that the finger gets electrically polarized and this induced charge creates a force between that finger and the surface. He named this phenomena "Electrically Induced Vibrations".<ref name=Mallinckrodt />
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| == Electrostatic Force Theory ==
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| An electrostatic force is created by applying a time varying voltage between an electrode and an insulated ground plane. When a finger scans over an insulated plate with a time varying voltage, the finger works as the induced ground plane. The induced static electricity creates an electric force field between the finger and the surface.
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| A parallel-plate capacitor model can be used to approximate the skin-surface interface. The electrode acts as one plate, while the conductive subcutaneous layer in the skin acts as the other, thus representing a hybrid natural/artificial electrostatic actuator.<ref name=agarwal>Agarwal, A.K.; Nammi, K.; Kaczmarek, K.A.; Tyler, M.E.; Beebe, D.J.; , "A hybrid natural/artificial electrostatic actuator for tactile stimulation," Microtechnologies in Medicine & Biology, 2nd Annual International IEEE-EMB Special Topic Conference on (?), vol., no., pp.341-345, 2002</ref> The following equation approximates the electrostatic force experienced between the finger and the electrode.
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| <math>F_\mathrm{e} = \frac{\varepsilon_0\varepsilon_rAV^2}{2d^2}</math>
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| where,
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| <math>\varepsilon_0</math> : permittivity of free space
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| <math>\varepsilon_r</math> : dielectric constant
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| <math>A</math> : area of electrodes
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| <math>V</math> : voltage applied between the two plates
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| <math>d</math> : distance between two plates
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| The resulting force is too small to perceive by human skin, but when the finger is moving on the surface a frictional force appears on the moving finger, which can be expressed as:
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| <big><math>f = \mu F_\mathrm{e}</math></big>
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| where,
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| <math>\mu</math> : coefficient of friction.
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| Further research has shown that this model is not sufficient to explain such skin-surface interfaces.<ref name=agarwal/>
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| == Perception of Electrostatic Friction ==
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| {{Empty section|date=February 2013}}
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| == Electrovibration as a Modality ==
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| {{Empty section|date=February 2013}}
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| == References ==
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| <references/>
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| [[Category:Electricity]]
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| [[Category:Sensory receptors]]
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