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                  NPP                  Computer Basics and Windows Fundamentals                    45


                      (1) LED (Light Emitting Diode): LED is a    (1) LED (bmB©Q> B{_qQ>J S>m`moS>): LED cmc àH$me
                  source of red light. The light emitted by LED  H$m òmoV hmoVm h¡Ÿ& LED go {ZH$cm àH$me noS> na n‹S>Vm h¡Ÿ&
                  falls on the mouse pad and reflects back towards
                  sensor.                                     `h àH$me namd{V©V hmoH$a g|ga H$s Va\$ OmVm h¡Ÿ&
                      (2) Sensor (Photodiode): This device re-    (2) g|ga (\$moQ>moS>m`moS>): `h `w{º$ namd{V©V àH$me
                  ceives the reflected light coming from the sur-  H$mo àmßV H$aVm h¡Ÿ& 1500 B_oO/goH§$S> H$s Xa go {g¾ëg
                  face. The signals are accepted around 1500 im-  àmßV {H$E OmVo h¢Ÿ& `o {g¾ëg DSP àmogoga H$mo Xo {XE
                  ages/second. These signals are passed to DSP
                  processor.                                  OmVo h¢&
                      (3) DSP Processor: This processor is fitted  (3)  DSP àmogoga: `h àmogoga  IC (BÝQ>rJ«oQ>oS>
                  into the mouse in the form of an IC (Integrated  g{H©$Q>) Ho$ ê$n _| _mCg _| cJm hmoVm h¡Ÿ& `h g|ga
                  Circuit). The signals received from sensor are
                  analysed by  DSP processor  to examine  the  namd{V©V àH$me Ho$ n¡Q>Z© ‘| n[adV©Z H$m narjU H$aZo Ho$
                  changes in the pattern of reflected light. The  {bE LCD àmogoga Ûmam {díbofU H$m nVm cJmVm h¡Ÿ& `h
                  change in light-pattern indicates the distance  n[adV©Z _mCg Ûmam Mcr JB© Xyar H$mo Xem©Vm h¡Ÿ& `h
                  travelled. The information of distance travelled  OmZH$mar H$åß`yQ>a H$mo àXmZ H$s OmVr h¡Ÿ& Bg OmZH$mar
                  is passed to the computer. The pointer moves  Ho$ AZwgma H$g©a D$na `m ZrMo OmVm h¡Ÿ& `h àmogoga
                  up or down depending upon the information.
                  The DSP processor operates at around 18 MIPS  cJ^J 18 MIPS ({_{c`Z B§ñQ´>ŠeZ à{V goH§$S>) H$s Xa
                  (Millions of Instructions per Second).      go H$m`© H$aVm h¡Ÿ&
                  Merits of Optical Mouse                     Am°pßQ>H$c _mCg Ho$ JwU

                  1.  Less chances of damage because no mov-  1. My±{H$ H$moB© `m§{ÌH$ nwO} Zht h¢, AV: ZwH$gmZ H$s H$_
                      ing parts are used in optical mouse.        g§^mdZm hmoVr h¡Ÿ&

                  2.  Contamination with dust particles is less.  2. Yyc Ho$ H$Um| H$s Aew{Õ`m± H$_ hmoVr h¡Ÿ&
                  3.  High resolution because of large no. of im-  3. CÀM [aOmoë`yeZ hmoVm h¡ Š`m|{H$ EH$ goH§$S> _| A{YH$
                      ages taken per second and speed of DSP      B_oO àmßV H$aVm h¡ VWm DSP àmogoga A{YH$ J{V
                      processor.
                                                                  go H$m`© H$aVm h¡Ÿ&
                  4.  It can work on almost any surface having  4. Wmo‹S>r-gr ^r IwaXwar gVh BgHo$ {cE Cn`wŠV
                      least irregularities.                       hmoVr h¡Ÿ&

                  Optomechanical mouse                        Am°ßQ>mo_oHo${ZH$b _mCg
                      It has two rotating wheels mounted at 90 O  Bg_| Xmo ìhrb hmoVo h¢Ÿ& BZHo$ Aj ^r bå~dV hmoVo
                  to each other. Large  number of uniformly   h¢& bo{H$Z àË`oH$ H$s n[a{Y _| N>moQ>o-N>moQ>o ñbm°Q> ~Zm {XE
                  spaced slots  are made along the circumfer-  OmVo h¢Ÿ& àË`oH$ ìhrb Ho$ H|$Ð _| EH$ LED hmoVr h¢ Am¡a
                  ence  of the wheel.  Each  wheel  contains an
                  LED  in  its centre.  A detector is also placed  ìhrb Ho$ ~mha EH$ {S>Q>oŠQ>a hmoVm h¡ Ÿ& O¡go- O¡go ìhrb
                  outside the wheel. The number of light pulses  Ky_Vm h¡, d¡go-d¡go àH$me H$s nëg {N>Ð _| go hmoH$a
                  detected by the detector gives an idea of dis-  {S>Q>oŠQ>a na n‹S>Vr h¡Ÿ& BZ nëgm| H$s g§»`m go Hw$b Xyar
                  tance travelled.                            H$m nVm MbVm h¡Ÿ&
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