R
rosy
what is the differenece between laser and DMP printer
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J
JustMe
rosy said:what is the differenece between laser and DMP printer
The difference is about like night and day.
T
Tony
rosy said:what is the differenece between laser and DMP printer
Rosy
The acronym DMP nearly always refers to an "Impact" Dot Matrix Printer. These
work by striking the paper with a tiny blunt needle through an inked ribbon and
build up an image. The printhead usually has either 8 or 24 such needles
although there are variations on this. They are generally black only but some
do have other colours in the ribbon. They are no good at all for photographic
or accurate imaging work but have their place mainly in commercial workplaces.
Laser printers are non impact and through a number of processes put the image
on the paper with toner which is an extremely fine powder, this is then fixed
or fused onto the paper using heat. They are faster than DMP printers, produce
usually better text and significantly better images, although not strictly
photo quality they are getting better at this. Lasers are available as black
only or full colour.
The reason for the confusion is that a laser printer can be described as a Dot
Matrix printer since the image is built of dots but since it is not an impact
printer it is not a DMP.
Tony
W
William R. Walsh
Hi!
A "true" dot matrix printer prints by using a printhead full of pins (9 or
24 as the other poster mentioned, though I don't know where 8 pins comes
from--never seen one of those) that are "fired" against a ribbon by a
solenoid or other mechanism. The ribbon and pins strike the paper and leave
a mark in the shape of the pins.
Dot matrix printers can be slow and noisy (though some are startlingly fast)
but they are great for printing on carbon-copy forms. (I don't know of any
other printer type that could print on those forms and have copies come out,
apart from a daisy wheel unit...) They are also great for general purpose
forms or printing on continuous flow paper that separates into sheets with
perforations.
They do pretty well with text, but images don't usually fare as well. Color
units do exist, but they are slow and the quality is not that good.
Panasonic made quite a few consumer-grade color capable dot matrix printers.
Laser printers work a bit differently, and have a lot in common with
photocopiers. Where a photocopier takes its image using a reflective
process, the laser printer uses a controller to draw the image on a rotating
drum with...you guessed it...the laser. When the laser draws on the drum, it
causes a change that will attract toner to the drum in the pattern of
whatever was drawn. At this point, a sheet of paper passes around the drum
somehow and the toner is laid down on the paper. The drum is then erased and
cleaned. The paper goes on to move through a heating element which fixes the
toner on fairly permanently.
A laser printer can be much faster and is certainly quieter than a dot
matrix printer. In fact, laser printers are finally starting to replace dot
matrix printers, even with those that use multi-copy forms. (The approach
with the laser printer is to simply print multiple copies, and if a
different type of paper is required, pull it from an additional paper bin.)
William
what is the differenece between laser and DMP printer
A "true" dot matrix printer prints by using a printhead full of pins (9 or
24 as the other poster mentioned, though I don't know where 8 pins comes
from--never seen one of those) that are "fired" against a ribbon by a
solenoid or other mechanism. The ribbon and pins strike the paper and leave
a mark in the shape of the pins.
Dot matrix printers can be slow and noisy (though some are startlingly fast)
but they are great for printing on carbon-copy forms. (I don't know of any
other printer type that could print on those forms and have copies come out,
apart from a daisy wheel unit...) They are also great for general purpose
forms or printing on continuous flow paper that separates into sheets with
perforations.
They do pretty well with text, but images don't usually fare as well. Color
units do exist, but they are slow and the quality is not that good.
Panasonic made quite a few consumer-grade color capable dot matrix printers.
Laser printers work a bit differently, and have a lot in common with
photocopiers. Where a photocopier takes its image using a reflective
process, the laser printer uses a controller to draw the image on a rotating
drum with...you guessed it...the laser. When the laser draws on the drum, it
causes a change that will attract toner to the drum in the pattern of
whatever was drawn. At this point, a sheet of paper passes around the drum
somehow and the toner is laid down on the paper. The drum is then erased and
cleaned. The paper goes on to move through a heating element which fixes the
toner on fairly permanently.
A laser printer can be much faster and is certainly quieter than a dot
matrix printer. In fact, laser printers are finally starting to replace dot
matrix printers, even with those that use multi-copy forms. (The approach
with the laser printer is to simply print multiple copies, and if a
different type of paper is required, pull it from an additional paper bin.)
William