Page 58 - FUNDAMENTALS OF COMPUTER

NPP

58 Fundamentals of Computers NPP

Flat Bed Plotter âboQ> ~oS> ßbm°Q>a
In the type of plotter a flat surface is pro- Bg_| EH$ g_Vb gVh hmoVr h¡ {Og na S´>mBªJ erQ>
vided. The document on which a graph is to be
drawn, is placed on this surface. The pen is aI Xr OmVr h¡ Ÿ& noZ H$mo EH$ H¡$[aO na bJm¶m OmVm h¡&
mounted on a carriage. This pen can move in X noZ X VWm Y XmoZm| {XemAm| _| J{V H$a gH$Vo h¢ Ÿ& noZ H$s
and Y directions. The movement of pen is un- J{V J«m\$ ßbmqQ>J àmoJ«m_ Ho$ {Z`§ÌU _| hmoVr h¡ Ÿ&
der control of a graph plotting program.

1.29 Touch Screen 1.29 Q>MñH«$sZ
"A Touchscreen is a Video input device ''Q>MñH«$sZ EH$ Eogm {d{S>`mo BZnwQ> hmoVm h¡ Omo {H$
which can detect and locate the presence of any ñH«$sZ na {H$E JE g§nH©$ H$m nVm bJm gH$Vm h¡ VWm
touch generally made with the help of a finger.” CgH$s pñW{V H$mo ^r OmZ gH$Vm h¡Ÿ& `h g§nH©$ gm_mÝ`V:
A Touchscreen is generally able to detect contact hmW H$s C±Jbr go {H$`m OmVm h¡Ÿ&'' d¡go EH$ Q>MñH«$sZ
of any passive object. As of now, single contact {H$gr ^r dñVw Ho$ g§nH©$ H$mo OmZ gH$Vm h¡Ÿ& A^r VH$
Touchscreen is very popular. Multitouch screens EH$ Q>M dmbo Q>MñH«$sZ ~hþV _mÌm _| Cn`moJ _| AmVo h¢Ÿ&
are also coming into the market. There are two A~ AZoH$ Q>M H$aZo dmbo Q>MñH«$sZ ^r AmZo bJo h¢Ÿ&
important features of Touchscreen:
Q>MñH«$sZ H$s {ZåZ _hËdnyU© Xmo {deofVmE± hmoVr h¢:
1. It enables to interact with the objects 1. Omo ^r g§Ho$V ñH«$sZ na {XIVo h¢ BZ na H$m`© {H$`m
displayed on the screen.
Om gH$Vm h¡Ÿ&
2. Interaction is direct, without the need of 2. H§$ß`yQ>a go {H$`m OmZm dmbm Amngr g§àofU {~Zm
some intermediate device. {H$gr _Ü`ñW `wpŠV Ho$ Ûmam hmoVm h¡Ÿ&

Technology for Touchscreen Q>MñH«$sZ H$s VH$ZrH$r
Resistive Touchscreen: It contains two thin à{VamoYmË_H$ Q>MñH«$sZ: Bg_§o Xmo nVbr YmVw d
metallic electrically conductive and resistive à{VamoY H$s naV| hmoVr h¢Ÿ& BZHo$ ~rM _| Hw$N> Imbr ñWmZ
layers separated by thin space. When somebody
touches the panel, the layers are connected at hmoVm h¡Ÿ& O~ H$moB© BZH$mo Ny>Vm h¡ Vmo naV| {H$gr q~Xw na
certain point. The panel then acts as a voltage Ow‹S> OmVr h¢Ÿ& V~ n¡Zb dmoëQ>oO {S>dmBS>a H$m H$m_ H$aVr
divider. This causes a change in current sent, to h¡Ÿ& Bggo Ymam _| n[adV©Z hmoVm h¡Ÿ& `h n[adV©Z H§$Q´>moba
controller for processing. n[anW H$mo ^oOm OmVm h¡ Vm{H$ q~Xw H$m nVm Mbo&
Surface Acoustic Wave Touchscreen : ga\o$g EH$m°pñQ>H$ dod Q>MñH«$sZ: Bg Vah Ho$
Surface Acoustic Wave technology uses Q>MñH«$sZ _| AëQ´>mgmo{ZH$ Va§J| n¡Zb go bJmVma {ZH$bVr
ultrasonic waves that pass over the touchscreen
panel. When the panel is touched, a portion of ahVr h¢Ÿ& O~ H$moB© n¡Zb H$mo Ny>Vm h¡ Vmo Va§J| emo{fV hmo
the wave is absorbed. This change in the OmVr h¢Ÿ& Bggo Va§Jm| H$s Vrd«Vm n[ad{V©V hmoVr h¡Ÿ& Bg
ultrasonic waves is sent to the controller for n[adV©Z H$mo H§$Q´>moba n[anW H$mo àXmZ H$aHo$ Nw>E hþE q~Xw
processing. H$m nVm bJm`m Om gH$Vm h¡Ÿ&
Capacitive Touchscreen: It is coated with H¡$no{g{Q>d Q>MñH«$sZ: Bg na BÝS>r`_ {Q>Z Am°ŠgmB©S>
Indium Tin Oxide that conducts a continuous Zm_H$ nXmW© H$s naV M‹T>r hmoVr h¡Ÿ& Bggo g|ga _| bJmVma