The photocopier has evolved from being a luxury to a necessity in any modern office. Many people take the performance of a photocopier for granted. Do you have any idea how these amazing machines produce exact copies of a document?
What is the one basic physical principle that makes a photocopier work?
Opposite charges attract.
Mirrors reflect light.
What is a good way to see a simple version of the "opposites attract" principle in operation?
You can generate a static charge on a balloon by rubbing it on a sweater and see it attracting bits of paper.
Both of the above.
How does an image get from the paper onto the copier drum?
The drum is selectively charged by static electricity to match only the white spots on an original.
The drum is charged by static electricity, positive for black spots and negative for white spots on an original.
The drum is selectively charged by static electricity to match only the black spots on an original.
How is selective static charging accomplished on a photocopier drum?
photo chromic reaction
What electrical charge does toner carry before being exposed to a charged drum?
What happens with your original document after you place it on the glass and press the start button?
The document is subjected to focused intense ultra violet light moving from one end to the other.
The document is subjected to focused intense infrared light moving from one end to the other.
The document is subjected to focused intense incandescent light moving from one end to the other.
What is the electrical state of a drum before light is reflected onto it from your original?
The entire surface of the drum is charged with a positive charge.
The entire surface of the drum is charged with a negative charge.
The entire surface of the drum is made neutral, carrying no charge.
How does light manage to remove the positive charge from areas on the drum?
Wherever a photon of light hits the photoconductive drum, emitted electrons neutralize the positive charges.
Wherever a photon of light hits the photoconductive drum, emitted electrons reverse polarity of charges.
Wherever a photon of light hits the photoconductive drum, emitted electrons intensify negative charges.
What is the toner that is used in a photocopier?
fine plastic based powder
What is the coating of photoconductive material on the drum usually made from?
selenium or silicon
both of the above
How does toner that is held on the drum make its way to a sheet of blank paper to form a copy?
The paper is preheated so toner sticks to its warm surface as it passes above the rotating drum.
The paper is given a positive charge before it passes the drum and this charge pulls the toner onto the paper.
The paper is pushed hard against the drum by a second roller where the slightly tacky toner sticks.
How does the toner manage to stay on the paper once the paper looses its positive charge?
Paper containing the image is heated and pressed in order to fuse the toner image to the paper.
The copy of the image is sprayed with a fine mist of setter fluid and dried by a heating bar.
The paper is heated at the same time it is charged causing the toner to stick to the spots where it is attracted.
What components inside a photocopier charge the drum and paper with a positive charge?
What function does the lens have in a photocopier?
The lens serves to increase intensity and focus of light from the lamp onto an original document.
The lens allows you to adjust fine focus of an image to improve clarity of your original onto an enhanced copy.
What is the function of the fuser inside a photocopier?
Without allowing any sticking, the fuser must melt and press toner into the paper.
The fuser shoots microwave energy at the copy without touching it in order to melt the toner into the paper.
The fuser interrupts power to your photocopier to protect it from damage due to an electrical problem.