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                  NPP                  Computer Basics and Windows Fundamentals                    51


                      Optical Bar-code Readers are the scanners   Am°ßQ>rH$b ~ma-H$moS> arS>a Eogo ñHo$Za hmoVo h¢, Omo
                  which convert the information printed on bar-  ~ma-H$moS> na {bIr OmZH$mar H$mo àH$me Amn{VV H$aHo$
                  code into electrical pulses. These pulses can be
                  processed by computer. Now from this infor-  g_P boVo h¢& Bg OmZH$mar H$s ghm`Vm go H$åß`yQ>a Cg
                  mation computer will print the name and price  gm_mZ H$m Zm_, H$s_V Am{X ~Vm gH$Vm h¡ & ¶o ñH¡$Zg©
                  of item.  These scanners can  be seen  in  super  gwna ‘mH}$Q²>g ‘| XoIo Om gH$Vo h¢&
                  markets.

                   1.22 Printers                               1.22 {à¨Q>g©
                      Printers are the output devices used to pro-  {à¨Q>a AmCQ>nwQ> `wpŠV hmoVm  h¡,  Omo  H$mJO na
                  vide hard copy of the information. That means  OmZH$mar H$mo {à¨Q> H$aVm h¡Ÿ& Bg OmZH$mar H$mo hmS>© H$m°nr
                  printers are used to provide permanent record  H$hVo h¢Ÿ& BÝh| _w»`V: Xmo dJm} _| ~m±Q>m Om gH$Vm h¡…
                  on  a  paper.  Printers  are  broadly  classified  in
                  two categories:
                     1.  Impact Printers    2  Non-Impact Printers  1. BånoŠQ> {à¨Q>g©   2. Zm°Z-BånoŠQ> {à¨Q>g©

                  Impact Printers                             BånoŠQ> {à¨Q>g©
                      The printers which print the information    do {à¨Q>g© {OZ_| [a~Z na H$moB© dñVw Q>H$amVr h¡ Am¡a
                  with  the  help  of collision  of the  head on  the  Bg H$maU H$mJO na OmZH$mar {à¨Q> hmoVr h¡, BånoŠQ> {à¨Q>a
                  inked ribbon and paper, are called impact print-
                  ers.  For  example,  Dot  Matrix  Printer,  Chain  H$hbmVo h¢Ÿ& O¡go, S>m°Q>-_o{Q´>Šg {à¨Q>a, M¡Z-{à¨Q>a, S´>_-
                  Printer, Drum Printer etc. are Impact printers.  {à¨Q>a Am{X Ÿ& `o AmdmO H$aVo h¢Ÿ&
                  They produce Noise.
                  Non-Impact Printers                         Zm°Z-BånoŠQ> {à¨Q>g©

                      The collision between head and paper is     BZ_o| H$moB© Q>H$amZo H$s KQ>Zm Zht hmoVr h¡Ÿ& bo{H$Z
                  not the phenomenon used. But thermal, laser  D$î_m, àH$me, B§H$OoQ> VH$ZrH$s Am{X H$m Cn`moJ H$aHo$
                  beam, inkjet technology is used to take the print-  {à¨qQ>J H$s OmVr h¡Ÿ& O¡go, B§H$OoQ> {à¨Q>a, boOa {à¨Q>a
                  outs,  Examples  of  non-impact  printers  are,
                  inkjet printer, Laser printer etc.          Am{X Ÿ&
                  Another Classification of Printers          {à¨Q>g© H$m Xygam dJuH$aU

                      The printers may be classified as:          {à¨Q>g© H$mo {ZåZmZwgma ^r {d^m{OV {H$`m Om gH$Vm h¡…
                       Character Printers (Serial Printers)       Ho$aoŠQ>a {à¨Q>a (gr[a`b {à¨Q>a)
                       Line Printers.                             bmB©Z {à¨Q>a
                       Page Printers.                             noO {à¨Q>a
                  Character Printers (Serial Printers)        Ho$aoŠQ>a {à¨Q>a (gr[a`b {à¨Q>a)
                      Those printers which print one character    `o EH$ ~ma _| EH$ Ho$aoŠQ>a {à¨Q> H$aVo h¢ Ÿ& `o Q>mB©namBQ>a
                  at a time are called character printers. They are  Ho$ g_mZ hmoVo h¢ Ÿ& BZH$s J{V 30 go 600 Ho$aoŠQ>a à{V
                  similar  to  type-writers.  Their  printing  speed
                  lies  between  30  to  600  characters  per  second  g|H$S> (cps) hmoVr h¡ Ÿ& H$åß`yQ>a H$s _o_moar go Ho$aoŠQ>g© Ho$
                  (cps). The characters to be printed are received  H$moS> {à¨Q>a Ho$ ~\$a _| Mbo OmVo h¢ Ÿ& Bg ~\$a _| EH$-EH$
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