Photocopiers are used to scan and copy any file on paper and print it . It is used by us many times . But have you ever thought how it works ? It has a simple working principle .
Whenever we want to copy or xerox anything we need to open the lid of the scanner and place the side to be printed towards the side of the glass . When we start copying it puts a beam of light on the paper which reflects from it . The empty white areas reflect more light and other colored areas reflect lesser light . By the reflections, the copy is done on a drum . The drum rotates in the way the light is falling on the paper . In this way where more light is reflected the drum behaves differently and where there is less or no light it behaves differently . As the drum has electrostatic charged . A different compound called selenium (semi conductor) is above that When more light is put on selenium it gets more charge as semiconductors on heating get charged . In the drum the pattern and the content of the page is saved . There is a toner in the machine . Toner is the powder which is of different colors . As the drum is statically charged , then the paper comes near it and the toner gets stick to the paper . And then the paper is heated with rollers so that the color remains permanently . In this way the color gets stick to that paper because of this heat .
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This is the working principal of an analog machine used for photocopy .
But in the digital machines we can customize the size of the print . We can do smaller copies , bigger copies etc. There a CCD (Charge Coupled Device) which is a sensor is used . This sensor takes the photo of the page to be copied . This image can be stored digitally . In this machines the image is used further if there are copies of many pages are to be made .
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This type of principal is used in the laser printers (as used on analog copiers) . But in inkjet or ink tank printers the ink is in liquid form as in catridges or in tanks . Those printers have nozzles inside through which the liquid color comes out and get prints on the paper . That is why in some case while we touch a freshly printed page from inkjet printer we feel wet . The inkjet printers are initially very cheap . But the catridge used in them are very costly . In laser printers the initial cost is more but it will not take much from our pocket later on ...
Makar Sankranti
So this is all the knowledge I had . It is not copied knowledge, its my knowledge thats why it is called AnupKnowledge .
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Whenever we want to copy or xerox anything we need to open the lid of the scanner and place the side to be printed towards the side of the glass . When we start copying it puts a beam of light on the paper which reflects from it . The empty white areas reflect more light and other colored areas reflect lesser light . By the reflections, the copy is done on a drum . The drum rotates in the way the light is falling on the paper . In this way where more light is reflected the drum behaves differently and where there is less or no light it behaves differently . As the drum has electrostatic charged . A different compound called selenium (semi conductor) is above that When more light is put on selenium it gets more charge as semiconductors on heating get charged . In the drum the pattern and the content of the page is saved . There is a toner in the machine . Toner is the powder which is of different colors . As the drum is statically charged , then the paper comes near it and the toner gets stick to the paper . And then the paper is heated with rollers so that the color remains permanently . In this way the color gets stick to that paper because of this heat .
Also see - How SMS works ?
This is the working principal of an analog machine used for photocopy .
Also see - How camera of a phone works ?
This type of principal is used in the laser printers (as used on analog copiers) . But in inkjet or ink tank printers the ink is in liquid form as in catridges or in tanks . Those printers have nozzles inside through which the liquid color comes out and get prints on the paper . That is why in some case while we touch a freshly printed page from inkjet printer we feel wet . The inkjet printers are initially very cheap . But the catridge used in them are very costly . In laser printers the initial cost is more but it will not take much from our pocket later on ...
Makar Sankranti
So this is all the knowledge I had . It is not copied knowledge, its my knowledge thats why it is called AnupKnowledge .
Youtube
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