10.1 <
Glossary>
10 Glossary
Control Panel
A control panel is a flat area where control or monitoring instruments are
displayed. They are typically found in top or front of the machine.
Coverage
This is the printing term used for toner usage measurement on printing
and generally used as 5% coverage. 5% coverage means that an A4
sided paper has about 5% image or text on it. So, if the paper or original
has complicated images or lots of text on it, the coverage will be over 5%
and at the same time, toner usage will be as much as the coverage.
Default
The first set values.
DPI
This is the measurement of resolution which is used for printing or
scanning. Generally, more dots per inch result in a higher resolution,
more visible detail in the image, and a larger file size.
Duty Cycle
Duty cycle is the page quantity which does not affect printer performance
for a month. Generally the printer has the lifespan limitation such as
pages per year. The lifespan means the average capacity of print-outs,
usually within the warranty period. For example, if the duty cycle is 48,000
pages per month assuming 20 working days, a printer limits 2,400 pages
a day, which is not small amount.
Fuser Unit
This is the part of a laser printer that melts the toner onto the print media.
It consists of two hot rollers. After toner is transferred onto the paper, the
fuser unit applies heat and pressure to ensure that the toner stays on the
paper permanently, which is why paper is warm when it comes out of a
laser printer.
Grayscale
Shades of gray that represent light and dark portions of an image when
color images are converted to grayscale; colors are represented by
various shades of gray.
Halftone
This is an image type that simulates grayscale by varying the number of
dots. Highly colored areas consist of a large number of dots, while lighter
areas consist of a smaller number of dots.
ISO
The International Organization for Standardization (ISO) is an
international standard-setting body composed of representatives from
national standards bodies. It produces world-wide industrial and
commercial standards.
LED
A light-emitting diode (LED) is a semiconductor device that indicates the
status of a machine.
Print Media
Media such as papers, labels, and transparencies which can be used on
a printer, a scanner, a fax or, a copier.
OPC Drum
A mechanism that makes a virtual image for print using a laser beam
emitted from a laser printer, and it is usually green or gray-colored and
cylinder-shaped. An exposing unit of a drum is slowly worn away by its
usage of the printer, and it should be replaced appropriately since it
becomes scratched from grit in paper.
PDF
Portable Document Format (PDF) is a proprietary file format developed
by Adobe Systems for representing two-dimensional documents in a
device-independent and resolution-independent format.
PPM
Pages Per Minute. PPM shows the printer's speed, how many pages a
printer can actually print per minute.
PRN file
An interface for a device driver, this allows software to interact with the
device driver using standard input/output system calls, which simplifies
many tasks.
Resolution
The sharpness of an image, measured in dots per inch (dpi). The higher
the dpi, the greater the resolution.
Toner cartridge
It is a kind of bottle within a machine like a printer which contains toner.
Toner is a powder used in laser printers and photocopiers which forms the
text and images on the printed paper. Toner can be melted by the heat of
the fuser, causing it to bind to the fibers in the paper.
URL
Uniform Resource Locator (URL) is the global address of documents and
resources on the Internet. The first part of the address indicates what
protocol to use, the second part specifies the IP address or the domain
name where the resource is located.
USB
Universal serial bus (USB) is a standard that was developed by the USB
Implementers Forum, Inc., to connect computers and peripherals. Unlike
the parallel port, USB is designed to concurrently connect a single
computer USB port to multiple peripherals.